阅读说明：本技术 一种适用于油冷电机的旋转变压器 (Rotary transformer suitable for oil-cooled motor ) 是由 邓胜 王喜平 曹永辉 刘娇如 于 2021-03-15 设计创作，主要内容包括：本发明提供一种适用于油冷电机的旋转变压器,包括旋变主体、漆包线和保护盖；所述旋变主体为环状结构且在径向内壁上间隔均匀地环设有多个向径向内侧延伸的突出部,漆包线缠绕在突出部上形成线圈,在突出部的径向内端设有用于限位漆包线线圈的固定板,保护盖为环状结构且包括分别设置在旋变主体的轴向两侧的盖板一和盖板二,两个盖板均与旋变主体同轴设置,两个盖板的径向外侧边分别与旋变主体的两个轴向侧面连接,而径向内侧边对应连接并在连接位置处形成对于固定板的避空位,漆包线位于保护盖与旋变主体配合形成的腔体内,保护盖与固定板之间设有0.1-0.2mm间隙。本发明散热性好且阻止铁屑等杂质割伤漆包线,提高了旋转变压器的可靠性。(The invention provides a rotary transformer applicable to an oil-cooled motor, which comprises a rotary transformer main body, an enameled wire and a protective cover, wherein the enameled wire is arranged on the rotary transformer main body; the rotary transformer body is of an annular structure, a plurality of protruding portions extending towards the radial inner side are uniformly arranged on the radial inner wall in an annular mode at intervals, an enameled wire is wound on the protruding portions to form coils, a fixing plate used for limiting the enameled wire coils is arranged at the radial inner end of each protruding portion, the protective cover is of an annular structure and comprises a first cover plate and a second cover plate which are arranged on the two axial sides of the rotary transformer body respectively, the two cover plates are arranged coaxially with the rotary transformer body, the radial outer side edges of the two cover plates are connected with the two axial side faces of the rotary transformer body respectively, the radial inner side edges are correspondingly connected and form a space avoiding position for the fixing plate at the connecting position, the enameled wire is located in a cavity formed by matching the protective cover and the rotary transformer body, and a 0.1-0.2. The invention has good heat dissipation and prevents the enameled wire from being cut by impurities such as scrap iron and the like, thereby improving the reliability of the rotary transformer.)

1. A rotary transformer suitable for an oil-cooled motor is characterized by comprising a rotary transformer main body (3), an enameled wire and a protective cover;

the rotary transformer body (3) is of an annular structure, a plurality of protruding parts (4) extending towards the radial inner side are uniformly arranged on the radial inner wall of the rotary transformer body (3) in an annular mode at intervals, the enameled wire is wound on the protruding parts (4) to form a coil, a fixing plate (5) used for limiting the enameled wire coil is arranged at the radial inner end of each protruding part (4), the fixing plate (5) is of an arc-shaped structure, and the fixing plates (5) are matched to form a circular ring which is coaxial with the rotary transformer body;

the visor is ring structure and including setting up apron one (1) and apron two (2) in the axial both sides of changeing main part (3) soon respectively, two apron all with change main part (3) coaxial arrangement soon, the radial outside limit of apron one (1) and apron two (2) is connected with two axial side faces of changeing main part (3) soon respectively, and radial inboard side corresponds to be connected and forms the empty position of keeping away to fixed plate (5) in hookup location department, the enameled wire is located the cavity of visor and the cooperation formation of changeing main part (3) soon, be equipped with between visor and fixed plate (5) and be used for blockking clearance (6) that impurity got into the cavity in the cooling oil.

2. A resolver suitable for an oil cooled machine according to claim 1, characterised in that the width of the gap (6) is 0.1-0.2 mm.

3. The rotary transformer applicable to the oil-cooled motor according to claim 2, wherein the rotary transformer body (3) comprises a stator core and an insulating framework, the stator core is of an annular structure, a plurality of protrusions extending radially inwards are uniformly arranged on the radially inner wall of the stator core in an annular mode at intervals, the insulating framework covers the radially inner wall and the surfaces of the protrusions of the stator core, the protrusions (4) and the fixing plates (5) of the rotary transformer body are formed by matching the protrusions and the protrusions, and the protective cover is fixedly connected with the insulating framework.

4. The rotary transformer applicable to the oil-cooled motor according to claim 3, wherein the insulating framework and the protective cover are made of the same material, and ultrasonic welding is adopted between the insulating framework and the protective cover and between the first cover plate (1) and the second cover plate (2).

5. The rotary transformer applicable to oil-cooled motors of claim 4, wherein the insulating framework and the protective cover are made of PPA or PA.

6. The resolver suitable for an oil-cooled motor according to any one of claims 1 to 5, wherein an outlet structure (7) is further provided on the resolver body (3), one end of the outlet structure (7) is welded to the enameled wire, and the other end is provided with an interface connected to an external lead.

7. The rotary transformer applicable to oil-cooled motors of claim 6, wherein the protective cover is further provided with a plurality of oil inlet gaps (8), and the width of the oil inlet gaps (8) is 0.1-0.2 mm.

Technical Field

The invention relates to the technical field of sensors, in particular to a rotary transformer suitable for an oil-cooled motor.

Background

A resolver is an electromagnetic sensor that can be used to measure angular displacement and angular velocity of a rotating shaft of a rotating object. In recent years, the motor is gradually applied to an oil-cooled motor of a new energy automobile.

The rotary transformer mainly comprises a stator core, a rotor, an insulating framework and an enameled wire. The existing rotary transformer is usually that the enameled wire part is directly exposed outside, and the diameter of the enameled wire is very thin, so that when the rotary transformer works in an oil-cooled motor environment, the motor operates to enable impurities such as scrap iron to move along with the cooling oil at a high speed, the enameled wire is easily cut, and further the rotary transformer is caused to lose efficacy. In addition, under the high-speed impact of the cooling oil for a long time, the position of the whole enameled wire coil can also deviate, so that the measurement accuracy of the rotary transformer is reduced, and even the rotary transformer fails.

Aiming at the problems, the structure of the rotary transformer is improved in the industry, all enameled wires are sealed directly by adopting an injection molding mode, the purposes of protection and fixation are achieved, however, under the structure, firstly, the production yield and the efficiency of products are low, secondly, the enameled wires cannot realize quick heat dissipation, and the heat accumulation can cause the failure of the rotary transformer under the long-time work.

Therefore, there is a need in the art to develop a resolver with a new structure, which can reduce the occurrence of failure of the resolver due to the problem of enameled wires.

Disclosure of Invention

The invention aims to provide a rotary transformer which can avoid the cutting and displacement of an enameled wire and realize quick heat dissipation so as to solve the problems in the background technology.

In order to achieve the above object, the present invention provides a resolver for an oil-cooled motor, comprising a resolver main body, an enameled wire and a protective cover;

the rotary transformer body is of an annular structure, a plurality of protruding parts extending inwards in the radial direction are uniformly arranged on the radial inner wall of the rotary transformer body in an annular mode at intervals, the enameled wire is wound on the protruding parts to form coils, a fixing plate used for limiting the enameled wire coils is arranged at the radial inner ends of the protruding parts, the fixing plate is of an arc-shaped structure, and the fixing plates are matched with each other to form a circular ring which is coaxial with the rotary transformer body;

the protective cover is of an annular structure and comprises a first cover plate and a second cover plate which are arranged on two axial sides of the rotary transformer main body respectively, the two cover plates are arranged coaxially with the rotary transformer main body, the radial outer side edges of the first cover plate and the second cover plate are connected with two axial side faces of the rotary transformer main body respectively, the radial inner side edges are correspondingly connected and form a clearance position for the fixed plate at the connecting position, the enameled wire is located in a cavity formed by matching the protective cover and the rotary transformer main body, and a gap for blocking impurities in the cooling oil from entering the cavity is formed between the protective cover and the fixed plate.

Preferably, the width of the gap is 0.1-0.2 mm.

Preferably, the rotary transformer main body comprises a stator core and an insulating framework, the stator core is of an annular structure, and a plurality of protrusions extending towards the radial inner side are uniformly arranged on the radial inner wall at intervals in a surrounding mode, the insulating framework is coated on the radial inner wall and the protrusion surface of the stator core, the protrusions and the fixing plate are matched to form the rotary transformer main body, and the protective cover is fixedly connected with the insulating framework.

Preferably, the insulating framework and the protective cover are made of the same material, and the insulating framework and the protective cover, and the cover plate I and the cover plate II are welded through ultrasonic waves.

Preferably, the insulating framework and the protective cover are made of PPA or PA materials.

Preferably, the rotary transformer body is further provided with a wire outlet structure, one end of the wire outlet structure is welded with the enameled wire, and the other end of the wire outlet structure is provided with an interface connected with an external lead.

Preferably, the protective cover is further provided with a plurality of oil inlet gaps, and the width of each oil inlet gap is 0.1-0.2 mm.

The technical scheme provided by the invention at least has the following beneficial effects:

1. according to the invention, the structure of the existing rotary transformer is improved to realize the purpose of protecting the enameled wire, so that circulating cooling oil in the motor can enter the rotary transformer to be contacted with the enameled wire, the heat dissipation performance is good, impurities such as scrap iron and the like in the motor can be prevented from entering and cutting the enameled wire, the service life of the enameled wire is prolonged from the aspects of temperature and physics, and the rotary transformer is better protected.

2. The clearance between visor and the fixed plate has still played the effect that slows down the coolant liquid velocity of flow simultaneously, avoids enameled wire coil to take place the displacement because of the impact force that the liquid of long-term high-speed motion brought, ensures that the coil position is firm, has obtained the effect the same with the sealing process of moulding plastics, has improved the reliability of resolver during operation in oil-cooled motor.

3. In order to match with ultrasonic welding processing, the insulating framework and the protective cover are made of the same material, and the selected PPA or PA material is excellent in oil resistance.

4. The invention solves the problems of unstable welding quality, enameled wire breakage caused by external force dragging and the like caused by the direct connection of the enameled wire by arranging the wire outlet structure.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, it is obvious that the drawings described below are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

fig. 1 is a structural view of a rotary transformer in embodiment 1 of the present invention;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a right side view of FIG. 1;

FIG. 4 is an enlarged fragmentary view of encircled portion A of FIG. 1;

wherein: the structure comprises a first cover plate, a second cover plate, a rotary-change main body, a protruding portion, a fixing plate, a gap 6, a wire outlet structure 7 and an oil inlet gap 8.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to fig. 1 to 4, a resolver suitable for an oil-cooled motor includes a resolver body 3, an enamel wire, and a protective cover.

It is cyclic annular structure to become main part 3 soon the interval encircles evenly on the radial inner wall of main part 3 and is equipped with a plurality of protruding portions 4 that extend to radial inboard, the enameled wire winding forms the coil on protruding portion 4 the radial inner of protruding portion 4 is equipped with fixed plate 5 that is used for spacing enameled wire coil, fixed plate 5 is the arc structure, and the cooperation of a plurality of fixed plates 5 forms and becomes the ring of main part coaxial soon. The protruding part 4 and the corresponding fixing plate 5 form a T-like structure.

The visor is ring structure and including setting up apron one 1 and apron two 2 in the axial both sides of changeing main part 3 soon respectively, and two apron all with change the main part 3 coaxial setting soon, the radial outside limit of apron one 1 and apron two 2 is connected with two axial side of changeing main part 3 soon respectively, and radial inboard side corresponds to be connected and forms the clearance position of keeping away to fixed plate 5 in hookup location department, the enameled wire is located the cavity that visor and the cooperation of changeing main part 3 formed, be equipped with the clearance 6 that is arranged in blockking that impurity gets into the cavity in the cooling oil between visor and the fixed plate 5.

In the present embodiment, the gap 6 is provided along the circumferential direction of the fixing plate 5, wherein the width of the gap 6 in the axial direction of the rotating body 3 is 0.2mm, and the width of the gap 6 in the circumferential direction of the rotating body 3 is 0.1 mm. In addition, still be equipped with a plurality of even oil feed gaps 8 in interval on the surface of visor, the width in oil feed gap 8 is 0.1 mm.

Become main part 3 soon includes stator core and insulating skeleton, stator core is ring configuration and encircles a plurality of radial inboard projections that extend evenly at the interval on radial inner wall for annular structure, insulating skeleton adopts injection moulding's mode cladding at stator core's radial inner wall and protruding surface, and the two cooperation forms protruding portion 5 and fixed plate 5 that become the main part soon, visor and insulating skeleton fixed connection.

In order to match the above processing technology, in this embodiment, the insulating framework and the protective cover are made of the same material and are both PA 66.

In this embodiment, the stator core is formed by coaxially stacking a plurality of identical silicon steel sheets.

The rotary transformer body 3 is further provided with a wire outlet structure 7, one end of the wire outlet structure 7 is welded with the enameled wire, and the other end of the wire outlet structure is provided with an interface connected with an external lead.

The resolver in example 1 was subjected to comparative experimental verification, and the results are shown in table 1 below.

TABLE 1 Performance of resolver with different structures in operation

As can be seen from comparison of data of example 1 and comparative examples 1 to 2 in table 1, compared with the conventional bare-type resolver and plastic-packaged resolver, the present invention is similar to the bare-type resolver in heat dissipation performance, but is the same as the plastic-packaged resolver in effect of preventing impurities from cutting the enamel wire, and combines the advantages of the two, and the displacement problem of the enamel wire coil caused by liquid impact can be almost ignored.

Further, as can be seen from the comparison of the data of example 1 and comparative examples 3 to 4 in table 1, the overall effect of the gap (gap) is best in all aspects when the width is in the range of 0.1 to 0.2mm, and if the width is less than 0.1mm, the heat dissipation effect is greatly reduced, and if the width is more than 0.2mm, the situation that the enameled wire is cut by impurities and displaced by liquid impact is difficult to avoid.

The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and various modifications and changes may be made by those skilled in the art. Any improvement or equivalent replacement directly or indirectly applied to other related technical fields within the spirit and principle of the invention and the contents of the specification and the drawings of the invention shall be included in the protection scope of the invention.