阅读说明：本技术 紧凑型直接测量系统 (Compact direct measurement system ) 是由 D·雷伯 A·比雷 C·朗 于 2020-03-11 设计创作，主要内容包括：已知具有负载接收器(101)的电磁力补偿直接测量系统(100),所述负载接收器经由动力传递联动机构连接到力补偿装置(120),并且具有多部分平行引导机构,所述多部分平行引导机构具有至少两个通过动力传递联动机构间隔开的平行引导构件(131、132),其中,力补偿装置(120)具有至少一个永磁体(121)和电连接到可控电路的线圈(122),并且其中,至少一个平行引导构件(131、132)电集成在可控电路中。根据本发明,所述动力传递联动机构被设计为单部分线圈主体(110),使得线圈(122)在平行引导构件(131、132)之间布置在所述线圈主体上并且电连接到可控电路。(An electromagnetic force-compensated direct measuring system (100) is known with a load receiver (101) which is connected to a force compensation device (120) via a power transmission linkage and has a multipart parallel guide mechanism with at least two parallel guide members (131, 132) which are spaced apart by the power transmission linkage, wherein the force compensation device (120) has at least one permanent magnet (121) and a coil (122) which is electrically connected to a controllable circuit, and wherein the at least one parallel guide member (131, 132) is electrically integrated in the controllable circuit. According to the invention, the power transmission linkage is designed as a single-part coil body (110) such that a coil (122) is arranged on the coil body between parallel guide members (131, 132) and is electrically connected to a controllable circuit.)

1. An electromagnetic force compensated direct measurement system (100) having

A load receiver (101) connected to the force compensation device (120) via a power transmission linkage, and

a multipart parallel guide mechanism having at least two parallel guide members (131, 132) spaced apart by a power transmission linkage,

wherein the force compensation device (120) has at least one permanent magnet (121) and a coil (122) which is electrically connected to a controllable circuit, an

Wherein at least one parallel-guiding member (131, 132) is electrically integrated in the controllable circuit,

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

the power transmission linkage is designed as a single-part coil body (110) such that a coil (122) is arranged on the coil body between parallel guide members (131, 132) and is electrically connected to a controllable circuit.

2. Direct measurement system according to claim 1,

the coil body (110) is composed of a non-conductive material.

3. Direct measurement system according to claim 1 or 2,

the coil body (110) has at least two conductor strips (141, 142) which are electrically insulated from one another, wherein a first conductor strip (141) leads to the coil and a second conductor strip (142) leads away from the coil.

4. Direct measurement system according to claim 3,

the material of the coil body (110) is at least partially a thermoplastic which is doped with a non-conductive laser-activatable metal connection as a plastic additive, on which thermoplastic the conductor strips (141, 142) are laser-activated.

5. Direct measurement system according to one of claims 1 to 4,

wherein the force compensation device (120) has

At least one permanent magnet (121),

at least one pole shoe (123), and

a device housing (125),

wherein the permanent magnet (121), the pole shoe (123) and the device housing (125) are permanently connected to each other,

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

the coil body (110) has

An axial region (111) of the shaft,

a winding region (119) for the coil (122), which winding region extends concentrically with respect to the shaft region (111), and

a connecting plate (150) connecting the shaft region (111) and the winding region (119),

the device housing (125) simultaneously forms a housing of the direct-measuring system (100), wherein the passages (128) for the coil body (110) are formed at the upper and lower ends of the housing.

6. The direct measurement system of claim 5,

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

the coil body (110) is guided through the channel (128) spaced apart from the channel (128) by a surrounding gap, and the gap defines a maximum horizontal play between the coil body (110) and the device housing (125).

7. Direct measurement system according to claim 5 or 6,

at least one button (151) raised with respect to the connection plate (150) is formed on the connection plate (150), said button defining a distance to the pole shoe (123) as a maximum vertical play.

8. Direct measurement system according to one of the claims 5 to 7,

at least one stiffening structure (154) is formed between the shaft region (110) and the connecting plate (150), and a recess (124) for mounting the at least one stiffening structure (154) is formed on the pole shoe (123), such that the stiffening structure (154) and the recess (124) form a deformation protection of the coil body (110) relative to the device housing (125).

9. Direct measurement system according to one of claims 1 to 8,

wherein the at least one parallel guiding member (131, 132) electrically integrated in the controllable circuit has two electrical conductors (133, 134) isolated from each other,

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

each conductor strip (141, 142) of the coil body (110) is connected to a respective conductor (133, 134) of the at least one parallel guide member (131, 132), respectively.

10. Direct measurement system according to one of claims 1 to 8,

wherein the two parallel guiding members (131, 132) are electrically integrated in a controllable circuit,

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

each conductor strip (141, 142) of the coil body (110) is connected to the electrical conductor of a respective one of the two parallel guide members (131, 132).

11. The direct measurement system of claim 10,

wherein the two parallel guiding members (131, 132) electrically integrated in the controllable circuit are either completely composed of an electrically conductive material or have at least one electrically conductive surface,

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

the coil body has at its ends respective end surfaces (112) which are each formed as a contact electrically connected to one of the two conductor strips (141, 142), via which end surfaces (112) the respective parallel-guiding members (131, 132) are contacted, thereby being electrically integrated in the controllable circuit.

12. Direct measurement system according to one of claims 1 to 11,

wherein the force compensation device (120) has a device housing (125),

wherein both the fixed parallel leg (136) and the movable parallel leg (137) are formed in parallel guide members (131, 132) by suitable feedthroughs (135), which parallel legs are connected via at least one parallel guide (138),

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

the parallel guide members (131, 132) are at their fixed parallel legs (136)

Permanently attached to the device housing (125) by means of an electrically insulating adhesive, or

Is permanently attached to the device housing (125) on the electrically insulating interlayer by means of an adhesive.

13. Direct measurement system according to one of claims 1 to 11,

wherein the force compensation device (120) has a device housing (125),

wherein both the fixed parallel leg (136) and the movable parallel leg (137) are formed in parallel guide members (131, 132) by suitable feedthroughs (135), which parallel legs are connected via at least one parallel guide (138),

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

the parallel-guiding members (131, 132) are permanently soldered at their fixed parallel legs (136) to the respective circuit board (161, 162) and are members of the respective circuit board, an

The circuit board (161, 162) is then attached to the device housing (125) by means of screws (129) or by means of an adhesive.

14. Direct measurement system according to claim 13,

the circuit boards (161, 162) are formed as a single-part circuit board module (160) connected by a flexible conductive strip (163).

15. Direct measurement system according to one of the preceding claims,

wherein the direct measurement system has a position sensor (170),

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

the position sensor (170) is arranged above the upper parallel guide member (131) or below the lower parallel guide part (132) in a state configured for operation.

Technical Field

The invention relates to an electromagnetic force-compensated direct measuring system with a load receiver and a force compensation device having a coil and a permanent magnet.

An electromagnetic force compensated direct measurement system, hereinafter also referred to as direct measurement system, characterized in that the load receiver is directly connected to the force compensation device via a power transmission linkage.

Background

By means of electromagnetic force compensation, the forces caused by the load on the scale and/or the load receiver are compensated by a force compensation device comprising at least one permanent magnet and a coil, wherein the current flowing through the coil to generate the compensation force is measured. The measurement is proportional to the load placed. However, the measurement value also depends on the position of the coil in the magnetic field of the permanent magnet, so that the coil must always have the same position in relation to the magnet when recording the measurement value. After the load is applied, the position of the coil is determined by the position sensor and the current on the coil is increased until the displacement of the coil relative to the permanent magnet caused by the load is compensated. In doing so, a measurement of the coil current is made, which represents the mass of the weight of the placed load.

A direct measurement system is disclosed in CH 593481 a 5. In this patent specification, the load receiver is directly coupled to the force compensation device through a power transmission linkage. The movable side of the position sensor is attached to the power transmission linkage, while the fixed side of the position sensor is rigidly connected to an area where the load cell is fixed relative to the housing and/or to a fixed area of the force compensation device.

The direct measurement system is preferably used in a low load area. The accuracy of the measurement depends mainly on the resolution and arrangement of the position sensors in the direct measurement system. The load receiver and the coil of the force compensation device must be accurately guided relative to the fixed region of the load cell. This is done via a parallel-guiding mechanism whose movable parallel leg is connected to the power transmission linkage, while its fixed parallel leg is rigidly connected to an area where the load cell is fixed relative to the housing. The movable parallel leg and the fixed parallel leg are connected to each other by means of a narrow section elastic bearing through two rigid parallel guides. However, spring-loaded parallel guides may also be used; the narrow section elastomeric bearing is then omitted. When a load is placed on the load receiver, the power transfer linkage may shift in the direction of the load, which may cause the parallel guides to flex and bend the narrow section elastomeric bearings or elastomeric parallel guides.

Due to the spring constant of the parallel-guiding mechanism, it usually has a restoring force which likewise causes a displacement of the coil, just like a load placed on the load receiver, and which should likewise be compensated.

In US 3'968' 850A, the coil of the force compensation device is electrically connected to the controllable circuit via thin wires, as in CH 593481 a 5. A disadvantage of this design is that the wires establish a mechanical connection from the fixed part to the movable part of the load cell in addition to the electrical connection. Therefore, an additional spring constant is incorporated into the direct-measuring system, which acts on the parallel-guiding mechanism and may distort the measurement result. These wires are usually soldered on and are designed to be particularly thin and small in order to keep the additionally occurring spring constant as low as possible. However, thin wires are difficult to attach and one of the wires can quickly come loose, thereby losing its so-called function.

The spring constant, which arises as a result of the mechanical connection of the movable region and the fixed region of the load cell via the coil circuit, mainly influences the result of the load cell in the low-load region and/or when the weighing result has a higher resolution, since even a minimal change in the spring constant is sufficient to cause a change in the measurement result.

A parallel guide mechanism with at least two parallel guide members is disclosed in EP 1726926 a 1. These may be, for example, spring-loaded film-like parallel guide members, in which both fixed parallel legs and movable parallel legs, which are connected via at least one parallel guide, are formed by suitable feedthroughs.

Furthermore, for compact weighing modules with direct-measuring systems for a plurality of weighing devices, as disclosed for example in EP 1726926 a1, it is primarily shown that the zero drift of the direct-measuring system is negatively influenced by different thermal expansions of the components of the parallel-guiding mechanism which are connected to the position receiver and/or the power transmission linkage.

EP 1925919 a1 proposes an electromagnetic force-compensated direct-measuring system having a multipart parallel-guiding mechanism and a load receiver, wherein at least a part of the parallel-guiding mechanism is designed to transmit an electrical signal. In this case, the load receiver is connected via a power transmission linkage to a force compensation device having at least one permanent magnet and a coil electrically connected to the controllable circuit.

In order to determine the position of the coil after the application of the load, the direct-measuring system of EP 1925919 a1 has a position sensor. The position of the position sensor may be determined by suitable scanning. For example, a gap disposed on the power transmission linkage may be used as the position sensor. Various types of scanning for controlling the position of the position sensor are known, with optical scanning being preferred. It has been shown that the zero drift of the direct-measuring system is negatively influenced by different thermal expansions of the components of the parallel-guiding mechanism which are connected to the position sensor and/or the power transmission linkage. As taught in EP 1925919 a1, the position sensor must be arranged substantially midway between the upper and lower parallel guide members in order to obtain an electromagnetic force-compensated direct measurement system with as low a zero drift as possible. In order to make the direct-measuring system as insensitive as possible to zero-point drift, lower and upper parallel guide members are arranged between the load receiver and the force compensation device.

Robustness characterizes the ability of a system to withstand changes without adjusting its initial stable structure. The robustness of the measuring system is the resistance to forces not acting in the direction of displacement of the coil relative to the permanent magnet, which displacement is caused by the load. Robustness is a requirement for high reproducibility of a weighing sensor, e.g. a direct measurement system. To ensure the required robustness, the parallel guide members must be placed at a suitable distance relative to each other. The distance depends on the maximum force component that is expected, which may deviate from the expected direction of the coil relative to the permanent magnet.

In light of the aforementioned requirements, direct measurement systems exist on the market today, such as the WMC weighing module of mettler toledo (mettler toledo), which is compact but relatively high in construction. In this case, the overall installation height is always determined by adding the installation height of the parallel-guiding mechanism and/or of the power transmission linkage and the installation height of the force compensation device.

Disclosure of Invention

It is therefore an object of the present invention to increase the compactness of an electromagnetic force compensation direct measuring system and/or to reduce the installation height. In this case, it is advantageous that the number of mounting parts should be reduced and assembly should be simplified.

This object is achieved by a device having the features indicated in the present application. Advantageous embodiments of the invention are shown in other aspects of the application.

Electromagnetic force-compensated direct measurement systems are known with a load receiver which is connected to a force compensation device via a power transmission linkage and with a multipart parallel guide mechanism with at least two parallel guide members which are spaced apart by the power transmission linkage, wherein the force compensation device has at least one permanent magnet and a coil which is electrically connected to a controllable circuit, and wherein the at least one parallel guide member is electrically integrated in the controllable circuit. According to the invention, the power transmission linkage is designed as a single-part coil body, so that the coil is arranged on the coil body between the parallel guide members and is electrically connected to the controllable circuit.

The term "multipart parallel guide" as used herein means both that the parallel guide is composed of a plurality of components and that the parallel guide has a plurality of functional areas and/or active parts.

Since the power transmission linkage is formed as a single-part coil body, it is possible to arrange the coil between the parallel guide members, so as to obtain a direct measurement system having a more compact structure.

In a refinement of the invention, the coil body consists of a non-conductive material. Furthermore, the coil body can have at least two conductor strips which are electrically insulated from one another, wherein a first conductor strip leads to the coil and a second conductor strip leads away from the coil. The conductor strip integrated in the coil body simplifies the assembly of the direct-measuring system during its production.

In a further development of the invention, the coil body is constructed as a molded interconnection device. Injection-molded plastic components with metal conductor strips applied according to a special process and serving as interconnects for electronic and/or electromechanical components are characterized as molded interconnects, or MIDs. MIDs can be produced in the most diverse ways. The most important processes for applying the conductor strip and the emitting and/or shielding surface are two-shot moulding, hot stamping, mask illumination processes, direct laser structuring and in-mould decoration. At the very least, the material of the coil body can sometimes be a thermoplastic which is doped with a non-conductive laser-activatable metal connection as a plastic additive, on which thermoplastic the electrical conductor tracks are laser-activated.

In a further refinement, the force compensation device of the direct-measuring system has at least one permanent magnet, at least one pole shoe and a device housing, wherein the permanent magnet, the pole shoe and the device housing are permanently connected to one another. In this case, the coil body is characterized in that it has an axial region; a winding region for the coil, the winding region extending concentrically with respect to the shaft region; and a connection plate connecting the shaft region and the winding region; and the device housing simultaneously forms the housing of the direct measuring system, wherein the passages for the coil bodies are formed at the upper and lower ends of the housing. Furthermore, the coil body may be guided through the channel and spaced apart from the channel by a surrounding gap. This gap defines the maximum horizontal play between the coil body and the device housing, whereby the device housing acts as a horizontal stop for the coil body.

In a development of the coil body, at least one raised button is formed on the connection plate relative to the connection plate, said button defining the distance to the pole shoe as the maximum vertical play, so that the pole shoe acts as a vertical stop for the coil body. It is further possible that at least one reinforcing structure is formed between the shaft region and the connecting plate, and a recess for the form-fitting mounting of the at least one reinforcing structure is formed on the pole shoe, so that the reinforcing structure and the recess form a deformation protection of the coil body relative to the device housing.

The integrated design of multiple functions in a single component reduces the number of mounting parts. Therefore, the direct measurement system of the present invention is not provided with additional components or protection mechanisms that would deteriorate the degree of compactness.

In a first embodiment of the direct measurement system, the at least one parallel guide member electrically integrated in the controllable circuit has two electrical conductors isolated from each other. In so doing, one conductor strip of the coil body is correspondingly connected to one conductor of the at least one parallel-guiding member.

In a second embodiment, the direct-measuring system has two parallel guide members electrically integrated in a controllable circuit. In a first variant, one respective conductor strip of the coil body is connected to the electrical conductor of one respective link of the two parallel guide members. In a second variant, the two parallel-guiding members are entirely composed of an electrically conductive material or have at least one electrically conductive surface, wherein the coil body has at its ends respective end surfaces which are respectively formed as contacts which are respectively electrically connected to one of the two conductor strips, via which end surfaces the respective parallel-guiding members are contacted, thereby being electrically integrated in the controllable circuit.

According to the invention, the surfaces which are located at right angles to the axis of rotation at the upper and lower ends of the shaft region and which are arranged to establish contact with the parallel guide members are referred to as end surfaces. Since the electrically conductive connection is established between the end surfaces and the parallel-guiding members in direct form and manner, complex wiring and soldering work can be omitted.

Furthermore, the force compensation device can have a device housing, wherein both the fixed parallel leg and the movable parallel leg are formed by suitable feedthroughs, said parallel legs being connected via at least one parallel guide. According to a first refinement, the parallel-guiding member is permanently attached at its fixed parallel legs to the device housing by means of an electrically insulating adhesive or permanently attached to the device housing by means of an adhesive on an electrically insulating intermediate layer. In a second refinement, the parallel-guiding members are permanently soldered at their fixed parallel legs to the respective circuit board, the parallel-guiding members being members of the respective circuit board, which is then attached to the device housing by means of screws or by means of an adhesive. This second improvement may be improved to the extent that the circuit board is formed as a single-part circuit board module connected by flexible conductive strips.

The direct attachment of the parallel-guiding members to the device housing minimizes the number of parts even more significantly. If a circuit board or a circuit board module is used in between, a greater number of components must be accepted, but in return a better design in terms of simplified assembly is obtained and the mechanical connection between the parallel-guiding members and the device housing is improved, since solder connections have a better durability than adhesive connections. It is considered to be a great advantage that the parallel-guiding members can be soldered into the circuit board or circuit board module before the actual assembly of the direct-measuring system. Then, the welding or bonding work at the assembly site is omitted.

In a refinement of the direct-measuring system with the position sensor, the position sensor is arranged above the upper parallel-guiding member or below the lower parallel-guiding member in a state configured for operation.

Drawings

The individual details of the force-measuring device according to the invention are derived from the description of the exemplary embodiments shown in the drawings. The figures show:

FIG. 1 is a cross-sectional view of a direct measurement system with a load receiver, a power transmission linkage, a parallel guidance mechanism, and a force compensation device;

FIG. 2A is a perspective view of the direct measurement system in an assembled state;

FIG. 2B is an exploded view of the direct measurement system;

FIG. 2C is a circuit board module as part of the exploded view of FIG. 2B;

FIG. 3A is a perspective view of a power transmission linkage as a single part coil body;

FIG. 3B is a cross-sectional view of the coil body through plane E in FIG. 3A; and

fig. 4 is a plan view of the circuit board module in fig. 2C.

Detailed Description

Features having the same function and similar design are given the same reference numerals in the following description.

The direct-measurement system 100 in fig. 1 is shown in cross-section and has a load receiver 101, the load receiver 101 being connected to a position sensor 170 via a power-transfer linkage 110. The load receiver 101, the coil 122 of the force compensation device 120, and the shutter guide 171 of the position sensor 170 are accurately guided with respect to the device housing 125 of the force compensation device 120. This is done via a multipart parallel guide mechanism consisting of two parallel guide members 131, 132, the structure of which will be explained in more detail with the aid of fig. 4. The movable parallel legs 137 (see fig. 4) of the two parallel guide members 131, 132 are attached at the power transmission linkage 110, while the fixed parallel legs 136 (see fig. 4) are rigidly connected to the device housing 125 of the force compensation device 120 by means of respective circuit boards 161, 162.

In this case, the force compensation device 120 consists of two permanent magnets 121 between which a two-part pole shoe 123 is arranged. The separate pole piece 123 is surrounded by a coil 122, which coil 122 moves in the air gap between the previously mentioned pole piece 123 and the housing body 126 of the device housing 125. In this case, the power transmission linkage is formed as a single part of the coil body 110, and thus combines the functions of a simple power transmission linkage and a coil body, as shown, for example, in fig. 1 and 2 of EP 1925919 a 1.

The two parallel guide members 131, 132 are attached to circuit boards 161, 162, respectively, while said circuit boards 161, 162 are connected to a housing cover 127 or a housing body 126 of a device housing 125 of the force compensation device 120. Direct-measuring system 100 is then designed with appropriate conductor strips and contacts on circuit boards 161, 162, parallel-guiding members 131, 132 and coil body 110, so that coil 122 is electrically connected to the controllable circuitry. In this manner, the coil current is directed to the coil 122 and diverted without having to establish an additional mechanical connection between the fixed and movable regions of the direct measurement system 100.

The control of the position of the load receiver 101 used in this case is optical scanning. The light emitted from the light emitter 172 through the slits of the shutter guide 171 hits the light receiver 173, and the light receiver 173 generates a position signal corresponding to the position of the shutter guide 171 and/or the load receiver 101. The signals of the position sensor 170 are accessible at the connection board 174.

The temperature sensor 180 provides a temperature signal that can be used by the processing unit to compensate for deviations due to thermal influences when calculating the force acting on the load receiver 101.

Fig. 2A shows the direct-measurement system 100 in perspective view and in an assembled state. After combining the components shown in the exploded views of fig. 2B and 2C, an electromagnetic force compensated direct measurement system with a high degree of compactness is obtained. The number of components is also clear, since the device housing 125 of the force compensation device 120 simultaneously forms the housing of the direct-measuring system 100.

The exploded view in fig. 2B shows the direct-measurement system 100 of fig. 1. Permanent magnets (not visible) and lower portions of the pole pieces 123 have been arranged in the housing body 126. The pole piece 123 has a recess 124, in which recess 124 a reinforcement structure 154 (see fig. 3A and 3B) of the coil body 110 rests. The coil body 110 together with the coil 122 is thus aligned in a defined manner and protected against deformation. Another permanent magnet (not visible) and the upper part of the pole piece 123 are attached below the housing cover 127. The pole piece 123 can likewise have a recess. The housing cover 127 and the housing body 126 each have a passage 128 for the coil body 110 so as to be connected to parallel guide members 131, 132 (fig. 2C).

Since the housing body 126 and the housing cover 127 are also intended to guide the magnetic field lines, they should be considered as part of the magnet system. The case body 126 and the case cover 127 are made of a metal material for a strong and uniform magnetic field. When the coil current is supplied and drawn via the at least one parallel guide member 131, 132, it obviously has to be electrically insulated from the housing body 126 and/or the housing cover 127.

The circuit board module 160 shown in fig. 2C is placed around the device housing 125 and permanently attached thereto by means of housing screws 129. The circuit boards 161, 162 isolate the respective parallel guide members 131, 132 from the housing body 126 and/or from the housing cover 127. The welded connection at the contact points of the coil body 110 and the parallel guide members 131, 132 ensures that here a precise guidance of the coil body 101 within the force compensation device 120 develops.

The shutter guide 171 is attached to the coil body 110 from below, and finally positions itself in the optical axis between the light emitter 172 and the light receiver 173. The position sensor 170 is arranged to be attached to the housing main body 125 from below.

Fig. 3A and 3B illustrate the same power transmission linkage formed as a single-part coil body 110; they are described essentially collectively below. They are shown once in perspective (fig. 3A) and as a section through a plane E (fig. 3B) extending along the axis of rotation.

The coil body 110 has a shaft region 111 along the axis of rotation and between the surfaces 112, which in turn is connected to the winding body 119 via connection plates 150. The winding body 119 has, seen in isolation, the shape of a ring whose cross section of revolution is rectangular provided with recesses. The coil wire is wound into a coil (122, fig. 1) in the circumferential recess. The connection plate 150 is here positioned symmetrically between the front sides 112 of the shaft regions 111. Other arrangements are also possible, for example at the upper or lower end of the winding body 119, wherein the permanent magnets 121 and the pole shoes 123 would have to be adjusted in connection therewith.

The button portions 151 are disposed on upper and lower surfaces of the connection plate 150. These knobs 151 have parallel surfaces slightly raised with respect to the connection plate 150, said surfaces defining the distance to the pole piece 123 as the maximum vertical play in the assembled state of the direct-measuring system, so that excessive displacements and/or deflections of the coil body 110 do not cause any damage on the parallel-guiding members. To prevent deformation thereof, four reinforcing structures 154 are formed here between the shaft region 111 and the connection plates 150 on both sides of the shaft region. In the assembled state, these reinforcing structures 154 are mounted in the recesses 124 of the pole shoe 123, which have already been mentioned above with respect to fig. 1. Of course, other arrangements and numbers of reinforcing structures 154 are also contemplated, as shown in fig. 3A and 3B.

Further, fig. 3A and 3B of an embodiment of the coil body 110 show isolated electrical conductor strips 141, 142. The first conductor strip 141 extends from the upper end surface 112 over the shell surface of the shaft region 111, over the upper surface of the connection plate 150 and over the inner side of the winding body 119 to a contact surface on the upper front side of the winding body 119. The second conductor strip 142 extends in the same manner and from the lower end surface 112 to the contact surface on the lower front side of the winding body 119. The ends of the coil wires are attached to both contact surfaces, wherein the coil 122 can then be supplied with current by the contact of the end surface 112 with the parallel-guiding member.

The lines of the isolated electrical conductor strips 141, 142 may also be arranged on the same side of the connection plate 150, wherein then the parallel guide members located on that side of the connection plate 150 have two electrical conductors isolated from each other, such that each conductor strip 141, 142 is connected to a respective electrical conductor of the parallel guide member. The design of these electrical conductors has been extensively described in EP 1925919 a 1.

Fig. 4 shows the circuit board module 160 as already seen in fig. 2C, but in a plan view. The upper circuit board 161 and the lower circuit board 162, which are connected by the conductive strip 163, are oriented adjacent to each other with one side facing the viewer, which side is in contact with the device housing 125 in the assembled state. The circuit boards 161, 162 each have a recess for mounting the respective parallel guide member 131, 132, wherein only the upper parallel guide member 131 is shown in fig. 4. The respective parallel guiding members are connected to a source of electrical current via two mutually isolated electrical conductors which pass through the flexible electrically conductive strip 163 and the flexible current supply strip 164. Further contacts 165, 166, for example for a temperature sensor 180 or a position sensor 170 (both in fig. 1), may be integrated in the circuit boards 161, 162 and/or the circuit board module 160. The signal is then also accessible at the end of the current supply strip 164.

With the aid of the upper parallel-guiding member 131 shown in fig. 4, the design of the parallel-guiding member shown in fig. 1, 2A and 2C will now be briefly discussed. Fig. 4 shows a top view of the upper parallel-guiding member 131, the upper parallel-guiding member 131 here having three spiral passages 135, formed by the spiral passages 135: a movable parallel leg 137 that can be connected to the coil body 110; fixed parallel legs 136 that can be connected to the device housing 125; and three parallel guides 138 connecting the fixed and movable parallel legs. Thus, as shown in fig. 1, the coil body 110 is guided into the passage 128 of the device case 125.

EP 1925919 a1 likewise shows a further possible design of the parallel-guiding member, for example a parallel-guiding member with two electrical conductor strips; a parallel guide member formed by an electrical isolator to which a conductive material is applied to form a conductor strip; or parallel guide members with U-shaped feedthroughs. The previously described elements of the embodiments of the coil body and the parallel-guiding members may be combined with each other in any form and manner, provided only that the ends of the coil are electrically connected to the controllable circuit.

List of reference numerals

100 (electromagnetic force compensation) direct measurement system

101 load receiver

110 coil body/power transfer linkage

Region of 111 axes

112 end surface/contact

119 winding region

120 force compensation device

121 permanent magnet

122 coil

123 pole shoe

124 recess

125 device case

126 casing main body

127 casing cover

128 channels

129 shell screw

131 upper parallel guide member

132 lower parallel guide member

135 penetrating part

136 fixed parallel legs

137 movable parallel legs

138 parallel guide

141 first conductor strip

142 second conductor strip

150 connecting plate

151 button part

154 reinforcing structure

160 circuit board module

161 upper circuit board

162 lower circuit board

163 flexible conductive strap

164 current supply band

165 electric contact for temperature sensor

166 Electrical contact for position sensor

170 position sensor

171 shutter guide member

172 light emitter

173 light receiver

174 to contact

180 temperature sensor