阅读说明：本技术 用于制造用于电机的构件的绕组槽的槽绝缘装置的方法和设备 (Method and device for producing a slot insulation of a winding slot for a component of an electrical machine ) 是由 曼弗雷德·亨格 斯特芬·波尔 于 2018-12-03 设计创作，主要内容包括：为了减少用于制造槽绝缘部的时间,本发明实现一种用于制造用于电机的构件(16)的绕组槽(14)的槽绝缘装置(138)的方法,所述方法包括：a)提供绝缘材料的条带(10),c)从所述条带(10)切出绝缘条带段(12),d)使所述绝缘条带段(10)成形以适配所述绕组槽(14)的形状,并且e)将已成形的绝缘条带段(12)推入所述绕组槽(14)中,其中至少所述步骤d)和e)针对至少两个待推入不同的绕组槽(14)中的绝缘条带段(12)并行地执行。此外,描述了一种用于执行所述方法的设备(20)。(In order to reduce the time for producing a slot insulation, the invention provides a method for producing a slot insulation (138) for a winding slot (14) of a component (16) of an electrical machine, comprising: a) providing a strip (10) of insulating material, c) cutting insulating strip segments (12) out of the strip (10), d) shaping the insulating strip segments (10) to fit the shape of the winding slots (14), and e) pushing the shaped insulating strip segments (12) into the winding slots (14), wherein at least the steps d) and e) are performed in parallel for at least two insulating strip segments (12) to be pushed into different winding slots (14). Furthermore, an apparatus (20) for performing the method is described.)

1. A method for manufacturing a slot insulation arrangement (138) for a winding slot (14) of a component (16) of an electrical machine, the method comprising:

a) providing a strip (10) of insulating material,

c) cutting an insulating strip section (12) from the strip (10),

d) shaping the insulating strip section (10) to fit the shape of the winding slot (14), and

e) -pushing the shaped insulating strip section (12) into the winding slot (14),

it is characterized in that the preparation method is characterized in that,

at least the steps d) and e) are carried out in parallel for at least two insulating strip sections (12) to be inserted into different winding slots (14).

2. The method of claim 1, wherein the first and second light sources are selected from the group consisting of,

it is characterized in that the preparation method is characterized in that,

the steps c), d) and e) are carried out in parallel for at least three insulating strip sections (12) to be inserted into different winding slots (14) in each case.

3. The method according to any one of the preceding claims,

the method is characterized by comprising the following steps:

shaping the insulating strip section (12) in one of a plurality of shaping sections (54-47), and

-guiding the plurality of forming sections (54-57) on a circulating track (44) comprising at least one receiving station (a) for receiving the insulation strip segments (12) and an output station (D) for pushing the formed insulation strip segments (12) into the winding slots (14).

4. The method of claim 3, wherein the first and second light sources are selected from the group consisting of,

characterized in that at least one first, second and third forming section (54-56) is used, which travels in a clocked manner on the circulating track (44) at least from the receiving station (A) to a forming station (C), from the forming station (C) to the output station (D) and from the output station (D) to the receiving station (A).

5. The method of claim 4, wherein the first and second light sources are selected from the group consisting of,

characterized in that a fourth forming section (57) is used, wherein the first to fourth forming sections (54-57) travel between the stations (A-D) on the circulating track (44) in a clocked manner, wherein the stations (A-D) further comprise a positioning station (B) between the receiving station (A) and the forming station (C).

6. The method according to any one of claims 3 to 5,

it is characterized in that the preparation method is characterized in that,

6.1 making a cut-out at the receiving station (A), and/or

6.2 use is made of a forming section (54-57) with a first (124) and a second (126) forming member, and the first and second forming members (124, 126) are moved relative to each other during the movement on the encircling track (44) towards or at least one (D) of these stations to change the shape of the insulating strip section (12).

7. The method according to any one of the preceding claims,

characterized in that the manufacturing is performed in processing cycles, wherein two, three, four or more processing cycles are performed in parallel, wherein the processing cycles are selected from the group comprising:

-shaping at least one long edge or a plurality of long edges of the strip (10) or the insulating strip section (12);

-cutting out the insulating strip section (12) and/or flanging the flange (70) at the front edge of the strip (10) and/or at the rear edge of the insulating strip section (12);

-positioning the insulating strip section (12) in the forming section (55);

-stamping the insulating strip section (12) by means of a stamping punch (106) in the forming section (56) in order to form the slot insulation (138), and

-pushing the shaped insulation strip section (12) from the shaping portion (57) into the winding slot (14).

8. The method according to any one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

8.1 the process comprises the steps of:

b) shaping at least one long edge region of the strip (10) or of the insulating strip section (12) and/or

8.2 the process comprises step c): selecting an insulation strip segment length of an insulation strip segment (12) to be cut extending in a direction of movement of the strip (10) in dependence on an axial length of the winding slot (14); and comprising step e): -pushing in the shaped insulating strip section (12) in a push-in direction extending in the direction of the length of the insulating strip section.

9. An apparatus (20) for manufacturing a slot insulation arrangement (138) for a winding slot (14) of a component (16) of an electrical machine, the apparatus comprising:

providing means (58) for providing a strip (10) of insulating material,

-a cutting device (60) for cutting out a length of insulating strip (12) from the strip (10),

-shaping means (98) for shaping the insulating strip section (12);

a pushing-in device (140) for pushing the shaped insulating strip section (12) into the winding slot (14), and

a transport device (42) having a plurality of holding elements (38-41) for holding at least one insulation strip section (12), wherein the holding elements (38-41) can be moved on a circulating track (44) having a plurality of stations (A-D) for simultaneously processing a plurality of insulation strip sections (12).

10. The device (20) of claim 9,

characterised by one, more or all of the following features:

10.1 the transport device (42) having a plurality of forming sections (54-57) of the forming device (98) as holding elements (38-41);

10.2 the transport device (42) has a tool rotator (46) or is designed as a tool rotator;

10.3 the transport device (42) is designed to move the holding elements (38-41) from a receiving station (A) for receiving insulation strip sections (12) cut out by the cutting device (60) to a forming station (C) for forming the insulation strip sections (12) by the forming device (98), from the forming station (C) to an output station (D) for pushing the formed insulation strip sections (12) into the winding slots (14), and from the output station (D) to the receiving station (A),

10.4 the transport device (42) is designed to move the holding elements (38-41) from a receiving station (A) for receiving insulation strip sections (12) cut out by the cutting device (60) to a positioning station (B) for positioning the insulation strip sections (12) in the shaping sections (54-57) of the shaping device (89), from the positioning station (B) with the shaping (54-57) to a shaping station (C) for shaping the insulation strip sections (12) by the shaping device (98), from the shaping station (C) to an output station (D) for pushing the shaped insulation strip sections (12) into the winding slots (14), and from the output station (D) to the receiving station (A),

10.5 the transport device (42) is designed to move a first holding element (38) on the circulating path (44) from a first station (A) to a second station (B) and simultaneously with this to move a second holding element (39) from the second station (B) to the first station (A) or to another station;

10.6 the transport device (42) has a first, a second and a third holding element (38, 39, 40) for simultaneously processing at least three insulating strip sections (12) at a first to a third station (a, B, C);

10.7 the transport device (42) has a first, a second, a third and a fourth holding element (38-41) for simultaneously processing at least four insulating strip sections (12) at a first to a fourth station (A-D);

10.8 the cutting device (60) has a flange-rolling device (144) for rolling over the front edge of the strip (10) and/or the rear edge of the cut-out strip section (12);

10.9 the forming device (98) has a forming element or stamping punch (106) at the forming station (C); and/or

10.10 edge erecting means (36) are provided for erecting at least one long edge of the strip (10) and/or the insulating strip section (12).

11. The device (20) of claim 9 or 10,

it is characterized in that the preparation method is characterized in that,

the cutting device (60) is designed to cut out an insulation strip section (12) having an insulation strip section length that is dependent on the length of the winding slot (14) to be insulated, and the insertion device (140) is designed to insert the formed insulation strip section (12) in an insertion direction oriented in the direction of the insulation strip section length.

12. The device (20) according to any one of claims 9 to 11,

it is characterized in that the preparation method is characterized in that,

12.1 Each holding element (38-41) has a first holding sub-element (128) and a second holding sub-element (130), wherein the holding sub-elements (128, 130) are movable relative to one another, and/or

12.2 each holding element (38-41) is movably supported on the transport device (42); and is

A holding element drive (148) is provided for driving the relative movement of the holding sub-elements (128, 130) or the movement of the holding elements (38-41).

13. The apparatus (20) of claim 12,

it is characterized in that the preparation method is characterized in that,

the holding element drive device (148)

13.1 are configured for driving said relative movement or movement at one or more of said stations (A-D) and/or upstream of one or more of said stations,

and/or

13.2 is selected from the group of drives consisting of active single drives, independent single drives, actuators, link control devices, fixed links and link follower elements and coupling drives for coupling the holding element movement or holding sub-element relative movement with the movement of the transport device (42).

Technical Field

The invention relates to a method for producing a slot insulation arrangement for winding slots of a component of an electrical machine. The invention also relates to an apparatus for manufacturing a slot insulation arrangement for winding slots of a component of an electrical machine.

Background

For technical background of the present invention, see the following documents:

[1]US 2 282 773 B1。

the invention is based on the field of manufacturing electric motors or other electric machines, such as generators, designed for high power, reliable operation and high efficiency. In particular, electric motors are to be produced which can be used as traction motors for electric or hybrid vehicles and which have a power rating of between 20kW and 400kW, for example. In order to construct a stator for an electrical machine of this kind with excellent performance, it is advantageous to provide as high a coil density as possible. For this purpose, it is known to provide a coil winding which can be inserted into a radially open groove of a holding body, such as in particular the body of a stator or a rotor. In order to achieve a particularly high degree of filling, the coil winding is made in particular of metal wire having a rectangular cross section.

In order to electrically insulate the individual coil windings, a slot insulation is provided for each slot.

For the production of the geometry of the slot insulation, different methods exist. The aim is to push in an adaptable geometry in a short cycle time. In particular, the following methods are used, which are all mentioned in the document [1 ]:

1) slot insulation of wide coil, and

2) slot insulation of the narrow coil.

In a wide-reel variant, strips of insulating paper are cut from a supply roll. The complete geometry is then embossed in one cycle. The width of the web ultimately also determines the length of the insulation.

The advantages are that:

relatively short cycle times can be achieved

Small installation space requirement

Low cost equipment

The disadvantages are as follows:

low flexibility-adapting the slot insulation length requires retrofitting the apparatus for stock rolls of varying width.

The method according to modification 2) is described in detail in document [1 ]. Here, the paper is unwound as an insulating device and then cut; the flange is stamped and turned out, then the insulating paper is stamped and then ejected into the stator.

The method has the advantages that:

it is possible to vary the slot insulation length in the process even when the batch is 1

The disadvantages are that:

long cycle time

Large installation space requirements

Expensive apparatus

Disclosure of Invention

The invention proposes the object of realizing a method and a device for producing a slot insulation of a winding slot for a component of an electrical machine, by means of which a shorter cycle time can be achieved.

It is preferable to be able to achieve a smaller installation space and a lower-cost construction.

Preferably, the insulation is flexibly adaptable to the best possible insulation during the process.

To achieve this object, the invention achieves a method according to claim 1 and a device having the features of the dependent claims.

Advantageous embodiments are the subject matter of the dependent claims.

The invention according to one aspect thereof achieves a method for manufacturing a slot insulation arrangement for a winding slot of a component of an electrical machine, comprising:

a) a strip of an insulating material is provided,

c) cutting a length of insulating tape from the tape,

d) shaping the insulating strip section to fit the shape of the winding slot, an

e) Pushing the shaped insulation strip segments into the winding slots, wherein at least steps d) and e) are performed in parallel for at least two insulation strip segments to be pushed into different winding slots.

Preferably, steps c), d) and e) are carried out in parallel for at least three insulation strip sections to be pushed into different winding slots in each case.

A preferred embodiment of the method comprises the following steps: the method comprises the steps of forming the insulation strip segments in one of a plurality of forming sections and guiding the plurality of forming sections on a circulating track comprising at least one receiving station for receiving the insulation strip segments and an output station for pushing the formed insulation strip segments into the winding slots.

A preferred embodiment of the method comprises:

at least one first, second and third forming section is used, which travels in a clocked manner on a circulating track at least from the receiving station to the forming station, from the forming station to the output station and from the output station to the receiving station.

A preferred embodiment of the method comprises:

a fourth forming section is used, wherein the first to fourth forming sections travel in a clock-controlled manner between stations on the circulating track, wherein the stations further comprise a positioning station between the receiving station and the forming station.

Preferably, the hand-off is performed at the receiving station.

Preferably, a forming section is used having first and second forming members and the first and second forming members are moved towards each other at least one of the stations on the circulating track to effect the change of shape of the insulating strip section.

Preferably, the manufacturing is performed in processing cycles, wherein two, three, four or more processing cycles are performed in parallel, wherein the processing cycles are selected from the group consisting of:

-shaping at least one long edge or a plurality of long edges of the strip or insulating strip section;

-cutting an insulating strip section and/or a flange at a front edge of the strip and/or at a rear edge of the insulating strip section;

-positioning the insulating strip section in the forming section;

embossing the insulating strip section in the shaping section by means of an embossing punch in order to shape the slot insulation, and

-pushing the shaped insulation strip segment from the shaping portion into the winding slot.

Preferably, the method comprises the steps of:

b) shaping at least one long edge region of the strip or insulating strip section.

Preferably, step c) comprises: selecting an insulating strip segment length of the insulating strip segment to be cut extending in the direction of movement of the strip, in dependence on the axial length of the winding slot, and step e) comprises: the shaped insulating strip section is pushed in a push-in direction extending in the direction of the length of the insulating strip section.

According to another aspect, the invention realises an apparatus for manufacturing a slot insulation arrangement for winding slots of a component of an electrical machine, comprising:

a supply device for supplying a strip of insulating material,

a cutting device for cutting a length of insulating tape from the tape,

forming means for forming the insulating strip section;

a pushing-in device for pushing the shaped insulating strip section into the winding slot, and

a transport device with a plurality of holding elements for holding at least one insulation strip section, wherein the holding elements can be moved on a circulating path with a plurality of stations for the simultaneous processing of a plurality of insulation strip sections.

Preferably, the transport device has a plurality of forming sections of the forming device as holding elements.

Preferably, the transport device has a tool rotator or is designed as such a tool rotator.

Preferably, the transport device is designed to move the holding elements from a receiving station for receiving the insulation strip sections cut out by the cutting device to a shaping station for shaping the insulation strip sections by the shaping device, from the shaping station to an output station for pushing the shaped insulation strip sections into the winding slots and from the output station to the receiving station.

Preferably, the transport device is designed to move the holding element from a receiving station for receiving the insulation strip sections cut out by the cutting device to a positioning station for positioning the insulation strip sections in the forming section of the forming device, from the positioning station with the forming section to the forming station for forming the insulation strip sections by the forming device, from the forming station to an output station for pushing the formed insulation strip sections into the winding slots, and from the output station to the receiving station.

Preferably, the transport device is designed to move the first holding element on the circulating path from the first station to the second station and to simultaneously move the second holding element for this purpose from the second station to the first station or to another station.

Preferably, the transport device has a first, a second and a third holding element for processing at least three insulation strip sections simultaneously at the first to third stations.

Preferably, the transport device has a first, a second, a third and a fourth holding element for simultaneously processing at least four insulating strip sections at a first to a fourth station.

Preferably, the cutting device has a flange-turning device for turning over the front edge of the strip and/or the rear edge of the cut strip section.

Preferably, the shaping device has a shaping element or an embossing punch at the shaping station.

Preferably, edge erecting means are provided for erecting at least one long edge of the strip and/or the insulating strip section.

Preferably, the cutting means for cutting out the insulation strip lengths are configured with an insulation strip length that is related to the length of the winding slot to be insulated.

Preferably, the pushing-in device is designed for pushing in the formed insulating strip section in a pushing-in direction oriented along the length of the insulating strip section.

Preferably, each holding element has a first holding sub-element and a second holding sub-element, wherein the holding sub-elements are movable relative to each other.

Preferably, each holding element is mounted movably on the transport device.

Preferably, a holding element drive is provided for driving the relative movement of the holding sub-elements or the movement of the holding element.

Preferably, the holding element drive is configured for driving a relative movement or movement at one of the stations and/or upstream of one or more of the stations. The holding element can thus be moved at the station and/or, for example, during the movement towards the station, by means of a holding element drive. In particular, the first and second holding element sub-elements can be moved relative to one another by means of a holding element drive when the holding elements are located at the respective stations and/or on the path towards the respective stations.

The holding element driving means is preferably an element selected from the group of driving means comprising: an active single driver; a separate single driver; an actuator; a link control device; a fixed connecting rod and a connecting rod follower element and a coupling drive for coupling the movement of the holding element or the relative movement of the holding sub-elements to the movement of the transport device.

In a particularly preferred embodiment of the device and also in a preferred embodiment of the method, which can be carried out by means of these embodiments of the device, the holding element can be moved in a separately driven manner. In this case, for example, not the rotation of the transport device itself, which is embodied as a rotor, for example, but rather the actuation of the inherent movement of the holding element, in particular in a fourth phase in which, for example, the two halves can be folded together in order to obtain the final shape of the insulation part. However, the drive for the inherent movement of the holding element need not be limited to the folding in cycle four — in other embodiments other holding elements can also perform any inherent movement.

In a preferred embodiment, the driving of the inherent movement of the one or, if appropriate, also a plurality of holding elements can be effected either (i) by means of an active and independent single drive or (ii) by means of a link control (e.g. a fixed link) or by means of a coupling transmission depending on the rotational movement of the rotor.

Some advantages and details of preferred designs of the invention are set forth in detail below.

In the above-described method process 1), i.e. unwinding a wide web, steps can be saved with respect to the method process 2). However, in wide rolls the length of the insulation is preset by the width of the reserve roll. Adaptation in the process is not possible here. The preferred embodiment of the invention therefore relates to the unwinding of the narrow coil and works after process 2).

In order to accelerate the cycle time, in particular but not only in the method process 2) with narrow webs, the invention is based on the following basic idea: the various steps are decoupled and switched in parallel.

A preferred embodiment of the invention relates to a variant of unwinding a narrow coil. In a variant of the narrow roll, the insulating strip material, e.g. paper, is unwound from a reserve roll (step 1). Preferably, the material, e.g. continuous paper, obtains four consecutive bead portions, e.g. by means of a crimping roll or the like (step 2). In a preferred embodiment, the lateral edges at the bead are bent over on the long sides (step 3).

Preferably, the length of the groove insulation is cut to length individually (already when the batch is 1) in the cutting (step 4) and the collar is simultaneously stamped.

In addition, a preferred embodiment of the method comprises the following steps: the flange is rolled (step 6), the insulation or back is embossed (step 7), folded (step 8) and ejected into the stator (step 9).

In a particularly preferred embodiment, steps 4 to 9 are carried out simultaneously in four cycles carried out in parallel, by decoupling in time and by arranging them in parallel. Thereby greatly reducing cycle time. The number of drives is thereby also significantly reduced, which also improves process safety.

Drawings

Embodiments are explained in detail below with reference to the drawings. In which is shown:

fig. 1 shows a perspective view of a strip of insulating material for illustrating a first step of a method for producing a slot insulation arrangement for winding slots of a component of an electrical machine;

fig. 2 shows a perspective view of the strip of insulating material after performing the second and third steps of the method;

fig. 3 shows a perspective view of a section of insulating strip cut out from the strip of insulating material after performing the fourth and fifth steps of the method;

fig. 4 shows a perspective view of an insulating strip section after a sixth step of the method;

fig. 5 shows a perspective view of an insulating strip section after a seventh step of the method;

fig. 6 shows a perspective view of an insulating strip section after an eighth step of the method;

fig. 7 shows a perspective view of an insulating strip section and a component of an electrical machine having winding slots to illustrate a ninth step of the method;

fig. 8 shows a schematic perspective overview of a device for producing a slot insulation of a winding slot for a component of an electrical machine and for carrying out the method, the individual steps of which are shown in fig. 1 to 7;

fig. 9 shows a cross-sectional view of the apparatus with a sub-region of the holding element located at the first station during the execution of the fourth and fifth steps of the method;

fig. 10 shows a horizontal cross-section of the apparatus according to one of the embodiments with a sub-area of a holding element located at a second station for holding a length of insulating strip during execution of a sixth step of the method;

FIG. 11 shows a top view of a subregion of the section of FIG. 10 to further illustrate a sixth step;

fig. 12 shows a cross-sectional view through a transport means of the apparatus through an embodiment of the apparatus shown in fig. 8, wherein the first and fourth stations and the first to fourth holding elements of the apparatus are shown in a section plane transverse to the axis of rotation of the transport means; and

fig. 13 shows a schematic block diagram of a further embodiment of the method.

Detailed Description

Different embodiments of the method and apparatus 20 for producing a slot insulation 138 of a winding slot 14 of a component 16 for an electrical machine are explained in detail below with reference to the drawings.

Fig. 1 to 7 show the shaping steps during the shaping of the slot insulation 138 made of the strip 10 of insulating material, fig. 8 to 12 schematically show a preferred embodiment of a device 20 for carrying out the method, and fig. 13 shows a block diagram of a variant of the device 20.

In the method, a strip 10 of an electrically insulating material is first provided. The strip 10 is shown, for example, in fig. 1 and 2 and fig. 8.

Further, the method comprises the steps of: insulating strip segments 12 are cut from the strip 10. The insulating strip section 12 is shown for example in fig. 3 to 7.

Furthermore, in the method, the insulating strip section 12 is shaped to adapt to the shape of the winding slot 14, as is shown, for example, in fig. 5 and 6.

The insulating strip section 12 thus formed is then pushed into the winding slot 14 of the component 16 of the electrical machine, as shown for example in fig. 7. The component 16 is in particular a stator 18 of an electric machine, such as for example an electric motor to be inserted into an electric vehicle.

In order to reduce the cycle time and to reduce the installation space of the device 20, at least the following steps are carried out in parallel: the insulation strip segments 12 are shaped and pushed into the shaped insulation strip segments 12 for at least two insulation strip segments 12 to be pushed into different winding slots 14. In particular, the forming of the first insulating strip segment 12 is carried out at one station of the apparatus 20, while at the same time the previously formed further insulating strip segment 12 is introduced into the winding slot 14 at another station of the apparatus 20.

A preferred embodiment of the method and a preferred embodiment of the apparatus 20 are explained in detail below with reference to fig. 1 to 12.

First, various possible steps of the method and the shape of the insulating strip section 12 produced in these steps are explained in detail for this purpose with reference to fig. 1 to 7.

A preferred embodiment of the method has the following steps:

-a first step 1: providing a strip of insulating material, preferably by unwinding paper from a supply roll 22 constructed as a narrow roll;

-a second step 2: the first to fourth continuous crimping portions are introduced by the crimping rollers 24;

-a third step 3: bending the side edges 30, 32 at the bead portions on the long sides;

-a fourth step 4: cutting insulating strip segments 12 from the strip 10, preferably such that the length of the slot insulation is individually cut according to the length of the winding slot 14;

-a fifth step 5: a stamping flange 70;

-a sixth step 6: a rollover flange 70;

-a seventh step 7: embossing the insulating strip section 12, in particular the back 102 thereof;

-an eighth step 8: folding the insulating tape section 10;

-a ninth step 9: the shaped insulating strip segments 12 are ejected into the stator 18.

As can be seen from fig. 8 to 12, a preferred embodiment of the device 20 has: providing means 58 for providing a strip 10 of insulating material; a cutting device 60 for cutting insulating strip sections 12 from the strip 10; a forming device 98 for forming the insulating strip section 12; a pushing-in device 140 for pushing the shaped insulating strip section 12 into the winding slot 14; and a transport device 42 having a plurality of holding elements 38-41 for holding at least one insulation strip section 12, wherein the holding elements 38-41 are movable on a circulating track 44 having a plurality of stations a-D for simultaneously processing a plurality of insulation strip sections 12.

In a preferred embodiment, the device 20 has a plurality of forming sections 54 to 57 of the forming device 98 as holding elements 38 to 41.

The first station a is designed, for example, as a receiving station for receiving the insulating strip section 12 cut by the cutting device 60. The cutting device 60 is preferably also formed at the first station a. Preferably, the embossing of the flange 70 is continued at the first station.

The second station B is designed, for example, as a positioning station for positioning the insulating strip section 12 in the forming section 55 of the forming device 98 at this second station B. Preferably, the flange 70 is also folded at this second station B.

The third station C is preferably designed as a forming station for forming the insulating strip section 12 by means of a forming device 98.

The fourth station D is preferably designed as an output station for pushing the finished slot insulation 138 into the winding slots 14. In particular, the pushing device 140 is formed at the fourth station D.

By being configured with four stations, the apparatus 20 is able to perform the processing of the insulating strip segments 12 in four cycles, such that at least four insulating strip segments 12 can be processed simultaneously by performing four cycles in parallel at different stations.

The details of a preferred embodiment of the method and of the device are explained in detail below with reference to the drawings.

As shown in fig. 8, one possible embodiment of the supply device 58 has a supply web 22 and at least one conveying element, such as a deflecting and leveling roller 28. As can be seen from fig. 1 and 8, when carrying out first step 1, a supply web 22 is first provided, which here is designed as a narrow web. From this reserve web, the strip 10 of insulating material is unwound via a turning and leveling roller 28, for example driven by a drive of the turning and leveling roller 28 and a drive of the hemming roller 24.

Upstream of the crimping rollers 24 shown in fig. 8, the strip 10 has the flat shape shown in fig. 1. By means of the supply device 58, a strip 10 is provided which is composed of an electrically insulating material, in particular a paper material, for example a paper material coated with a plastic material.

The width BS of the strip 10 is selected in dependence on the width and depth of the winding slot 14 so that the inner face of the winding slot 14 can be covered and additionally the first side 30 at one long side and the second side 32 at the other long side can also cover the open side of the winding slot 14.

The first to fourth crimping portions 34 are introduced at the crimping roller 24 shown in fig. 8. The sides 30, 32 are then bent upwards in a side bending device 36 formed by a plurality of shaped blocks. The lateral bending device 36 is an embodiment of an edge-erecting device for erecting the edges of the insulating strip section 12.

The apparatus 20 has a plurality of holding elements 38-41 which can be moved cyclically on a circulating track 44 with a plurality of stations a-D by means of a transport device 42.

In the embodiment shown, the apparatus 20 has a first holding element 38, a second holding element 39, a third holding element 40 and a fourth holding element 41, which can be transported from the first station a to the second station B, and subsequently to the third station C and the fourth station D, by means of a transport device 42. For example, in fig. 8 to 12, the first holding element 38 is located at the first station a, the second holding element 39 is located at the second station B, the third holding element 40 is located at the third station C, and the fourth holding element 41 is located at the fourth station D. In the next cycle, the holding elements 38 are transported by the transport device 42 to the next station, respectively, such that the first holding element 38 is located at the second station B, the second holding element 39 is located at the third station C, the third holding element 40 is located at the fourth station D and the fourth holding element 41 is located at the first station a.

In the embodiment of the device 20 shown in fig. 8 to 12, the transport device 42 is designed as a tool rotator 36. The tool rotator 46 is rotatable about the axis of rotation 48 by means of a rotary drive 50 in order to bring the holding elements 38-41 to the next station a-D, respectively. For this purpose, the holding elements 38 to 41 are mounted on a cantilever arm, not shown in detail, of the rotational axis 52 of the tool rotator 46.

As can best be seen from fig. 12, the holding elements 38 to 41 are each formed as a profile 54 to 57 of the same type as one another or have such a profile 54 to 57. The design and construction of the formations 54-57 will be discussed in detail in this regard.

Fig. 9 shows a cross section through the entry region on the first holding element 38 at the first station a.

As can be seen from fig. 8 and 9, the strip 10 provided with the side edges 30, 32 is introduced into a holding element, here a first holding element 38, located at the first station a.

Accordingly, the supply of web 22, the turning and smoothing roller 28, the hemming roller 24 and the side bending device 36 form elements of a supply device 58 for supplying the strip 10, shown in fig. 1 and 2, of insulating material at the first station a.

The first station a is provided with a cutting device 60 for cutting the insulating strip length 12 out of the strip 10 and a flange embossing device 142 for embossing the flanges 70, which will be explained in detail below.

As can be seen from fig. 8 and 9, the cutting device 60 has a cutting blade 61 which is movable in a driven manner and by means of which the insulating strip section 12 pushed into the first holding element 38 is cut out of the remaining strip 10. The cutting blade 61 has a cutting edge 62 to which a bevel 63 is connected. The cutting edge 62 is formed on the side of the cutting blade 61 remote from the holding element 38; and the bevel 63 extends, viewed from the cutting edge 62, in the direction of movement of the cutting blade 61 towards the holding element 38. The cutting blade 61 is introduced into the gap 64 between the entry guide 66 and the cutting block 68. The insulation strip section 12 is cut directly at the entry guide 66 by the cutting edge 62 that is further away from the cutting block 48, wherein the end region of the cut insulation strip section 12 that extends over the gap 64 is guided by the chamfer 62 around the edge of the cutting block 68 and thus forms a collar 70, which is embossed at the edge of the cutting block 68.

The cutting block 68 is particularly preferably formed as part of the first slide 69, which is moved into its cutting position, for example after the introduction of the insulating strip section 12 into the first holding element 38, in order to carry out the cutting process (fourth step 4) and the embossing process of the flange 70 (fifth step 5) with the aid of the moved-in first slide 69. After the fourth step 4 and the fifth step 5 have been carried out, the first slide 69 is removed again, so that the transport of the holding elements 38 to 41 to the next station a to D, respectively, is enabled.

Furthermore, a holding punch 72 is indicated in fig. 9 and 8, which is movable radially towards the holding element 38 at the first station a in order to hold the insulating strip section 12 for cutting and can be pulled back again in order to effect a movement of the first holding element 38 with the insulating strip section 12 towards the next station B and to introduce the strip 10 in the next cycle at the fourth holding element 41 that is followed.

Thus, the fourth step 4 and the fifth step 5 are performed at the first station a and the shape of the insulating strip section 12 shown in fig. 3 is produced.

Simultaneously with the processing of the first insulating strip section 12 at the first station a, a further processing of the second insulating strip section 12 takes place at the second station B, which is cut out correspondingly at the first station a in the preceding working cycle, wherein the flange 70 has been correspondingly embossed.

At the second station B, as explained in detail in fig. 10, 11 and 4 in this case, the flange 70 is bent (sixth step 6) and the insulating strip section with the rolled-up flange 70 is positioned in the second holding element 39 formed as the second profile 55. For this purpose, a flange turning device 144 and a positioning device 146 are formed at the second station B, which will be explained in detail below.

At the second station B, a holding punch 72 is also formed, which functions analogously to the holding punch 72 at the first station a and in which the second insulating strip section 12 is fixed in the second holding element 39, which still projects with its end regions from the second holding element 39. The flange rollover device 144 has a second slide 73 at the second station B, which is movable in the axial direction toward the second holding element 39 in order to bend the flange 70 in the manner shown in fig. 11. Next, the holding punch 72 is pulled back at the second station B and the second insulating strip section 12 is pushed completely into the second holding element 39 by the third slider 76, an example of the positioning device 146. The profile of the insulating strip section 12 produced after processing at the second station B is shown in fig. 4.

While cutting the first insulating strip section 12 at the first station a and turning over the flange 70 at the second insulating strip section 12 at the second station B, the forming of the third insulating strip section 12 held in the third holding element 40 at the third station C is performed at the third station C by the forming device 98. This third insulating strip section 12 has been processed at the second station B in the previous cycle. The design of the forming device 98 is explained in detail below with reference to the illustration in fig. 12.

Fig. 12 shows the simultaneous arrangement of the holding elements 38-41 at the different stations a-D. Fig. 12 furthermore shows a cross section through the holding elements 38-41 which respectively act as a profile 54-57.

As can be seen from fig. 12, the holding elements 38 to 41 are substantially identically constructed. The holding elements each have a first receiving portion 80 for receiving the insulating strip section 12 and a second receiving portion 82 for receiving and shaping the insulating strip section 12. The first receiving unit 80 is formed wider than the second receiving unit 82. The second receptacle 82 is radially inward of the first receptacle 80 and opens out through its gap-like opening 84 at the bottom of the first receptacle 80.

In a preferred embodiment, the first receptacle 80 has a first lateral limiting element 86 and a second lateral limiting element 87 and has a bottom surface 88 at the bottom, against which the holding punch 72 can clamp the insulating strip section 12. The bottom surface 88 centrally has a gap-like opening 84.

The first receptacle 80 is preferably of substantially rectangular design in cross section, with grooves or undercuts 90 being formed at the sides in the lateral limiting elements 86, 87. An opening 92 is provided between the lateral limiting elements 86, 87 with respect to the bottom face 88, through which the respective retaining punch 72 can pass. In the embodiment shown, this opening 91 is designed as a longitudinal opening which extends over the entire length of the holding elements 38 to 41.

The second receiving portion 82 is designed to shape the insulating strip section 12. The second receptacle has a plurality of profiled surfaces 94, 95, 96 which form a negative mold for the outer face of the insulating strip section 12. The shape and arrangement of the shaped faces 94, 95, 96 is selected in accordance with the shape and arrangement of the side walls of the winding slot 14 to be insulated.

The third station C is configured as a forming station for forming the insulating strip section 12. At this forming station C, the insulating strip section 12, here at the third holding element 40, is formed by a forming device 98. The forming device 98 has forming sections 54-57 and an embossing punch 106 that acts as a forming element. The embossing punch 106 is movably arranged at the third station C, so that it can be moved radially into the second receptacle 82 and can be removed again.

To this end, as the forming surfaces 94 to 96, there are provided a first forming surface 94 for forming a first side wall portion 100, a second forming surface 95 for forming a back portion 102, and a third forming surface 96 for forming a second side wall portion 104.

The embossing punch 106 is designed to press the third insulating strip section 12 from the first receiving portion 80 through the gap-like opening 84 into the second receiving portion 82 when it is pushed into the second receiving portion 82.

The stamping punch 106 is preferably further designed to press the third insulating strip section 12 against the second profiled surface 95 after it has been pressed through the opening 94, wherein the transition between the rear part 102 and the side wall parts 100, 104 is stamped at the edge of the free end of the stamping punch and between the first profiled surface 94 and the second profiled surface 95 and at the transition between the second profiled surface 95 and the third profiled surface 96.

Between the shaping region 108 delimited by the shaping surfaces 94, 95, 96 and the gap-like opening 84, the second receptacle 82 has a transition surface 110 which tapers in the direction of the axis of rotation 48. The transition between the first receptacle 80 and the shaping region 108 is thus configured in a funnel-like manner, so that the insertion of the insulating strip section 12 through the gap-like opening 84 is simplified.

Preferably, the shaping region 108 widens again after the transition surface 110, so that the shaping region 108 has a greater width than the conical transition region 112 delimited by the transition surface 110.

The forming surfaces 94, 96 forming the side wall sections 100, 104 are likewise formed at an angle at the third station C, so that the forming region 108 tapers conically, viewed from the radially outer side to the radially inner side.

The stamping punch 106 has a thicker region 116 at the free end 114 and then further radially outward a thinner region 118 which lies at the radial level of the transition region 112 when the stamping punch 106 is completely introduced into the second receptacle. By configuring the forming region 108 with the inclined forming surfaces 94, 96 to taper off and by the sequence of the thicker region 116 and the thinner region 118 at the embossing punch 106, the insulating strip section 12 can be pressed through the gap-like opening 84, wherein the upright side edges 30, 32 can project into the recess 120 realized by the configuration of the thinner region 118 and thus be transitioned by the transition region 112 and then lie at the side support surface 122 extending transversely to the adjacent forming surfaces 94, 96.

As can further be seen from fig. 12, the first to fourth forming sections 54 to 57 each have a first forming member 124 and a second forming member 126 which are movable relative to one another for a further step of forming the insulating strip section 12.

The relative movement can be performed in different ways. In the illustrated embodiment, the forming members 124, 126 are pivotable relative to one another.

At the first to third stations a to C, the forming members 124, 126 are located in a first position in which the receiving portions 80, 82 have the orientation and configuration previously described.

For this purpose, the first forming member 124 is formed at the first holding sub-element 128, while the second forming member 126 is formed at the second holding sub-element 130. Furthermore, a holding sub-element drive 148 is provided, which serves to drive the relative movement of the first and second holding sub-elements 128, 130. The function and function of which will be explained in detail below.

The shape obtained at the third station C of the third insulating strip section 12 is shown in detail in fig. 5. Here, the correspondingly embossed back 102 and the first and second side wall portions 100, 104 can be seen. Here, the side walls 100, 104 are still formed at an angle to one another, so that in cross section a trapezoidal shape is formed, wherein the back 102 forms the narrower side of the trapezoid. On the wider side, the insulating strip section 12 is still open, so that the embossing punch 106 can be removed again. The opening is bounded on the left and right by curved side edges 30, 32 which extend here at an angle of more than 90 degrees towards the respective side wall part 100, 104.

At or during the movement towards the fourth station D, an eighth step 8 is then carried out, whereby the fourth insulating strip section 12 held in the fourth holding element 41 at the fourth station D is folded from the shape shown in fig. 5 to the shape shown in fig. 6. As can be seen from fig. 12, for this purpose the first holding subelement 128 and the second holding subelement 130 are moved relative to one another by means of the holding subelement drive means 148, so that the first forming subelement 124, which has the first forming surface 94, and the second forming subelement 126, which has the third forming surface 96, are moved relative to one another.

In the embodiment shown, the holding sub-elements 128, 130 are pivoted relative to one another for this purpose. Other motions are possible in other designs.

This inherent movement of the drive holding element 41 can be carried out in different ways.

In a configuration that is not shown in detail, the holding sub-element drive 148 has a separate drive or a separate actuator (not shown). This drive or actuator can be formed, for example, at the fourth station D and moves the holding element 41 by gripping it with a drive-movable element. For example, two sliders are provided, which pivot the holding sub-elements 128, 130 relative to one another by pushing in. In a further embodiment, the holding sub-element drive 148 has a link guide (not shown) at the transition to the fourth station D, into which the mating elements at the holding sub-elements 128, 130 engage, so that a movement of the holding sub-elements 128, 130 is initiated by a movement of the transport device 42 relative to the link guide.

Thus, at or during movement toward the fourth station D, the forming surfaces 94, 96 are oriented toward each other. The transition surface 110 can serve as a stop for this purpose.

Furthermore, the fourth station D has a pushing-in device 140. The insertion device has a fourth slide block, not shown in detail here, which is inserted, for example, guided by guide grooves 132, into the second receptacle 82 in the central axis of the first and third forming surfaces 94, 96 and is pushed axially as a whole by the fourth holding element 41 in order to push the completely formed insulating strip section 12 out of the fourth holding element 41 and through an ejection opening 134, indicated in fig. 8, in a support plate 136 of the transport device 42 into the winding slot 14 of the stator 18 oriented thereby, as illustrated in fig. 7. After insertion, the stator 18 is then rotated further around the slot by means of a stator holding and moving device, not shown in detail, until the next winding slot 14 is aligned with the ejection opening 134.

In the embodiment of the device 20 shown in fig. 8 to 12, the execution of the above-described steps 4 to 9 is thus distributed to the stations a to D, which are arranged in a rotating manner in the tool rotator 46 about a horizontal axis, the rotation axis 48.

For this purpose, steps 4 to 9 are assigned to the first to fourth cycles. This also reduces the installation space requirement. In a first cycle, at a first station a, the insulating material, for example, formed as paper, is pushed into the tool rotator 46 by means of the already upwardly folded side edges 30, 32, after the third step 3. The length of the subsequent slot insulation 138-see fig. 7-is related to how far the strip 10 of insulation material is pushed in.

Furthermore, in the first cycle, the strip 10 of insulating material is clamped at the first station a and the first slide 69 is moved in. Next, the insulation is cut out and the flange 70 is simultaneously stamped. The first slide 69 is moved out again.

Next, the tool rotator 46 is rotated 90 degrees about a second cycle, at a second station B. In this case, the flange 70 is rolled over by the second slider 74 and the insulating strip section 12 is pushed completely into the tool rotator 46 by the third slider 76. Instead of having a second slider 74 and a third slider 76, the functions of the second slider and the third slider can also be performed in a combined common slider.

After continuing to rotate 90 degrees with respect to the third cycle, the third station C, the imprint punch 106 moves in. In this case, the insulating strip section 12 is pressed into the embossing profile, for example the third profile 56, and the back 102 is embossed. The embossing punch 106 is removed again before the next 90 degrees rotation. In this last rotation, the two forming section halves, the first 128 and the second 130 holding sub-element, are folded via the tie rods and the insulating strip sections 12 are folded together, eighth step 8. Whereby the insulating strip section 12 obtains the final shape. In a fourth phase, at a fourth station D, an ejector (fourth slide, not shown) presses the finished slot insulator 138 from the tool rotator 46 into the stator 18. After the ejector is moved back, the tool rotator 46 can be rotated again to the first cycle — into the first station a. The process repeats. In each cycle, a new strip 10 of insulating material is pushed in at the first station a, so that always four insulating strip segments 12 are simultaneously located in the tool rotator 46. The stator 18 itself continues to rotate around the slot after each push into the slot insulator 138.

The insulating strip section 12 remains in the same form, the forming sections 54-57, during the entire process duration. Thereby, direct transport of the insulating strip section 12 itself is avoided.

In the embodiment of fig. 8 to 12, the plurality of holding elements 38 to 41 is formed at the tool rotator 46, so that the transport device 42 is formed by the tool rotator 46 and its rotary drive 50. A circular circulating track 44 is thus formed, on the circumference of which a plurality of stations a-D can be formed, so that a plurality of processing steps can be carried out in parallel and simultaneously.

However, the concepts illustrated herein are not limited to being configured as a tool rotator 46. A corresponding plurality of holding elements 38 to 41 can also be moved between the stations on differently designed circulating rails 44, as is shown in fig. 13. Conceivable arrangements are also possible as chain or bucket elevators with a recycling section for the holding elements 38-41 and the respective forming section 54-57. Thus, different settings of the stations a-D can also be realized. However, at least two steps of the method are always carried out in parallel at different stations and in particular the step of shaping the insulation strip section 12 and the step of pushing in the shaped insulation strip section 12 are carried out here.

List of reference numerals

1 first step

2 second step

3 the third step

4 fourth step

5 the fifth step

6 sixth step

7 seventh step

8 eighth step

9 ninth step

10 strips (made of insulating material)

12 insulating strip section

14 winding slot

16 structural member

18 stator

20 device

22 reserve roll

24 hemming roller

28 turning and leveling roll

30 first side edge

32 second side edge

34 crimping part

36 side bending device

38 first holding element

39 second holding element

40 third holding element

41 fourth holding element

42 transport device

44 encircling track

46 tool rotator

48 axis of rotation

50 rotary driver

52 rotating shaft

54 first forming portion

55 second forming section

56 third forming section

57 fourth Forming section

58 supply device

60 cutting device

61 cutting blade

62 cutting edge

63 inclined plane

64 gap

66 entry guide

68 cutting block

69 first slide

70 flange

72 holding punch

74 second slider

76 third slider

80 first receiving part

82 second receiving part

84 gap-like openings

86 first lateral limiting element

87 second lateral limiting element

88 bottom surface

90 undercut

92 longitudinal opening

94 first shaped surface

95 second shaped surface

96 third Forming surface

98 forming device

100 first side wall part

102 back part

104 second side wall portion

106 stamping punch

108 shaped zone

110 transition surface

112 transition region

114 free end

116 thicker region

118 thinner region

120 concave part

122 side support surfaces

124 first forming member

126 second forming member

128 first holder element

130 second holding sub-element

132 guide groove

134 liftout opening

136 support plate

138-slot insulating device

140 pushing device

142 flange stamping device

144 flange turning device

146 positioning device

148 holding element driving device

A first station

B second station

Width of BS strip

C third station

D fourth station