DE102020121616A1 - torque sensors - Google Patents

Abstract

The invention relates to a torque sensor system (1), comprising a shaft (2) with a first annular closed axial magnet section (21) which is magnetized in a first circumferential direction, and with a second annular closed axial magnet section (22) which in is magnetized in a second circumferential direction, the first circumferential direction being opposite to the second circumferential direction. The torque sensor system also includes a first sensor unit (100), a second sensor unit (200), a third sensor unit (300), and a fourth sensor unit (400), each along a longitudinal axis parallel to the axis of rotation of the shaft (2), adjacent to the shaft (2) are arranged. Each of the sensor units (100, 200, 300, 400) has two sensor coils (101, 102; 201, 202; 301, 302; 401, 402) arranged spaced apart from one another in the vertical direction (y),
and two sensor units (100, 200; 300, 400) arranged axially adjacent to each other are assigned to different magnet sections (21; 22) for detecting magnetic field changes which have been generated due to torsion of the shaft (2).

Description

The present invention relates to a magnetoelastic torque sensor system, comprising a shaft with a first annularly closed axial magnet section that is magnetized in a first circumferential direction, and with a second annularly closed axial magnet section that is magnetized in a second circumferential direction, the first circumferential direction is opposite to the second circumferential direction.

A wide variety of so-called multi-band measuring systems for measuring twisting of shafts caused by torsion are already known from the prior art. The most common are the so-called 2-band measurements and 3-band measurements, in which the measuring systems have two or three separate magnet sections. As an example, reference is made to the EP 33 64 163 A1 and the EP 1 716 399 A1 , where in the EP 1 716 399 A1 a method for magnetic coding of a sensor element for a torque sensor is described and in which the EP 33 64 163 A1 a magnetoelastic torque sensor for 2-band measurement is described, the magnetic field sensors used being designed as 3D-AMR sensors.

In addition, in the DE 10 2017 109 532 A1 describes an arrangement for measuring a torque on a machine element extending in one axis using the inverse magnetostrictive effect. The machine element has exactly one or exactly two magnetization regions, which extend circumferentially around the axis, for one magnetization each. The arrangement also includes exactly two magnetic field sensors, which are each designed to individually measure a radial directional component of a magnetic field caused by the at least one magnetization and by the torque.

• - ein Bauteil, jedenfalls teilweise ferromagnetisches Material aufweisend, einen magnetisierbaren Bereich, der wenigstens drei Magnetspuren umfasst, von denen die zueinander Benachbarten jeweils zueinander entgegengerichtet magnetisiert sind und die wenigstens drei Magnetspuren axial zum Bauteil angeordnet sind,

wobei der ersten äußeren und mindestens einer mittleren Magnetspur jeweils wenigstens eine Spule eines ersten Magnetfeldsensors zur Emittierung je eines Signals radial zum Bauteil zuordenbar ist und wobei der mindestens einer mittleren und zweiten äußeren Magnetspur jeweils wenigstens eine Spule eines zweiten Magnetfeldsensors zur Emittierung eines Signals radial zum Bauteil zuordenbar ist. Dabei ist das Signal des ersten Sensors in Verhältnis zu dem Signal des zweiten Sensors setzbar.From the DE 20 2015 105 090 U1 a device for detecting an external magnetic influence is known. This device includes

• - a component, at least partially comprising ferromagnetic material, a magnetizable area, which comprises at least three magnetic tracks, of which those adjacent to one another are magnetized in opposite directions to one another and the at least three magnetic tracks are arranged axially to the component,

at least one coil of a first magnetic field sensor for emitting a signal radially to the component can be assigned to the first outer and at least one middle magnetic track, and wherein at least one coil of a second magnetic field sensor to emit a signal radially to the component can be assigned to the at least one middle and second outer magnetic track is assignable. The signal from the first sensor can be set in relation to the signal from the second sensor.

The object of the invention is to provide an alternative torque sensor system for a redundant 2-band measurement that works according to the inverse magnetostrictive principle. The torque sensor system is advantageously designed to be space-optimized, without this resulting in a loss of performance or a loss of compensation.

• - eine erste Sensoreinheit, die entlang einer ersten Längsachse und parallel zur Drehachse der Welle benachbart der Welle angeordnet ist,
• - eine zweite Sensoreinheit, die entlang der ersten Längsachse oder entlang einer zweiten Längsachse parallel zur Drehachse der Welle benachbart der Welle angeordnet ist,
• - eine dritte Sensoreinheit, die entlang einer dritten Längsachse parallel zur Drehachse der Welle, umfänglich versetzt zu der ersten Längsachse und/oder zweiten Längsachse, benachbart der Welle angeordnet ist, und
• - eine vierte Sensoreinheit, die entlang einer vierten Längsachse parallel zur Drehachse der Welle, umfänglich versetzt zu der ersten Längsachse und/oder zweiten Längsachse und/oder dritten Längsachse, benachbart der Welle angeordnet ist. Dabei weist jede der Sensoreinheiten zwei in vertikaler Richtung zueinander beabstandet angeordnete Sensorspulen auf. Ferner sind jeweils zwei axial benachbart angeordnete Sensoreinheiten unterschiedlichen Magnetabschnitten zur Erfassung von Magnetfeldänderungen, die aufgrund einer Torsion der Welle erzeugt worden sind, zugeordnet. Hierdurch wird der Vorteil erzielt, dass mit konstruktiv einfachen Mitteln eine Drehmomentsensorik geschaffen wird, mittels der homogene Störfelder, wie z.B. das Erdmagnetfeld, effektiv kompensiert werden können.

This object is achieved by a torque sensor system that works according to the principle of the inverse magnetostrictive effect and has the features of patent claim 1. A torque sensor system according to the invention comprises a shaft with a first annularly closed axial magnet section, which is magnetized in a first circumferential direction, and with a second ring-shaped closed axial magnet section, which is magnetized in a second circumferential direction, wherein the first circumferential direction is opposite to the second circumferential direction. The first magnet section and the second magnet section are arranged axially adjacent to one another, and a free axial area can be arranged between the first magnet section and the second magnet section, or the first axial section can directly adjoin the second axial section. Furthermore, the torque sensor system includes

• - a first sensor unit arranged adjacent to the shaft along a first longitudinal axis and parallel to the axis of rotation of the shaft,
• - a second sensor unit, which is arranged adjacent to the shaft along the first longitudinal axis or along a second longitudinal axis parallel to the axis of rotation of the shaft,
• - a third sensor unit, which is arranged along a third longitudinal axis parallel to the axis of rotation of the shaft, circumferentially offset from the first longitudinal axis and/or second longitudinal axis, adjacent to the shaft, and
• - a fourth sensor unit, which is arranged along a fourth longitudinal axis parallel to the axis of rotation of the shaft, circumferentially offset from the first longitudinal axis and/or second longitudinal axis and/or third longitudinal axis, adjacent to the shaft. In this case, each of the sensor units has two sensor coils arranged spaced apart from one another in the vertical direction. Further two sensor units arranged axially adjacent to each other are assigned to different magnet sections for detecting magnetic field changes that have been generated due to torsion of the shaft. This achieves the advantage that a torque sensor system is created with structurally simple means, by means of which homogeneous interference fields, such as the earth's magnetic field, can be effectively compensated.

Further advantageous refinements of the invention are specified in the dependently formulated claims. The features listed individually in the dependent claims can be combined with one another in a technologically meaningful manner and can define further refinements of the invention. In addition, the features specified in the claims are specified and explained in more detail in the description, with further preferred configurations of the invention being presented.

According to an advantageous embodiment of the invention, it can be provided that the sensor coils arranged adjacent in the axial direction of axially adjacent sensor units are interconnected in such a way that a common measurement current Imess can be applied to them in the opposite direction and parallel to the respectively assigned longitudinal axis. The advantage of this configuration is that it is possible to diagnose the two torque signals and errors can be better recognized.

According to a further preferred development of the invention, it can also be provided that the two sensor coils of a separate sensor unit are connected in such a way that they can be acted upon in opposite directions and parallel to the respective associated longitudinal axis with a common measurement current Imess. In this way, redundancy with increased functional safety can be created or guaranteed within the system.

Furthermore, according to a likewise advantageous embodiment of the invention, provision can be made for the sensor units arranged along the same longitudinal axis to be arranged on a common carrier, in particular on a common circuit board. In this way, a cost-effective construction of the torque sensor system can be achieved with simple assembly at the same time.

According to a further particularly preferred embodiment of the invention, it can be provided that the first longitudinal axis and the third longitudinal axis as well as the second longitudinal axis and the fourth longitudinal axis are circumferentially offset by 180 degrees to one another. In this way, the effect can be achieved in particular that further interference or interference fields can be compensated for.

Furthermore, the invention can also be further developed such that the first longitudinal axis and the second longitudinal axis are arranged to coincide with a common longitudinal axis and/or that the third longitudinal axis and the fourth longitudinal axis are arranged to coincide with a common longitudinal axis. This also allows the torque sensor system to be further improved with regard to the elimination of interference fields.

In a likewise preferred embodiment variant of the invention, it can also be provided that the first longitudinal axis is offset from the second longitudinal axis and the second longitudinal axis is offset from the third longitudinal axis and the third longitudinal axis is offset from the fourth longitudinal axis by 90° to one another, which provides a further design alternative for the Structure of the torque sensor is provided.

It can also be advantageous to further develop the invention in such a way that the sensor coils of the sensor units are connected in such a way that a total of four sensor coils of different sensor units are connected in series in two paths connected in parallel and one connection each at the two ends of the two paths connected in parallel is present for the task of a first or a second driver signal. As a result, two independent torque signals can be generated and a corresponding redundancy can be implemented.

According to a further preferred embodiment of the subject matter of the invention, it can be provided that a control unit is provided for controlling the sensor units of the torque sensor system with a first driver signal in the form of a square-wave signal and with a second driver signal in the form of a square-wave signal, with the two driver signals being formed inversely to one another.

Finally, the invention can also be implemented in an advantageous manner such that the sensor coils of the sensor units are of identical design, whereby the advantage of identical components is achieved with the aim of reducing costs, and component tolerances within the system can also be further reduced.

In addition, it is provided that the torque sensor with an engine control device for To connect control of an electric drive machine in an electrically drivable motor vehicle and to use the signals for detecting changes in the magnetic field that have been generated due to torsion of the shaft to control the electric drive machine. This provides an optimized torque measurement for controlling a drive unit, in particular a drive unit in a drive train of a motor vehicle that can be driven by an electric motor.

The invention and the technical environment are explained in more detail below with reference to the figures. It should be pointed out that the invention should not be limited by the exemplary embodiments shown. In particular, unless explicitly stated otherwise, it is also possible to extract partial aspects of the facts explained in the figures and to combine them with other components and findings from the present description and/or figures. In particular, it should be pointed out that the figures and in particular the proportions shown are only schematic. The same reference symbols designate the same objects, so that explanations from other figures can be used as a supplement if necessary.

• 1 eine Drehmomentsensorik zur 2-Band-Messung in schematischer Darstellung, in Seitenansicht,
• 2 eine Drehmomentsensorik zur 2-Band-Messung in einer ersten Ausführungsform mit zwei umfänglich um eine Welle herum verteilt angeordneten Trägerplatinen, in schematischer Darstellung, in axialer Draufsicht,
• 3 eine Drehmomentsensorik zur 2-Band-Messung in einer zweiten Ausführungsform mit vier umfänglich um eine Welle herum gleichmäßig verteilt angeordneten Trägerplatinen in schematischer Darstellung, in axialer Draufsicht
• 4 die erfindungsgemäße Drehmomentsensorik in einer Abwicklung mit einer bevorzugten Spulenanordnung und -verschaltung, in einer möglichen Ausführungsform, in schematischer Darstellung,
• 5 die erfindungsgemäße Drehmomentsensorik gemäß 3, in einer Abwicklung mit einer bevorzugten Spulenanordnung und - verschaltung, wobei die Spulen auf insgesamt vier Trägerplatinen verteilt sind,
• 6 die Signalverläufe der Treibersignale sowie gemessene Drehmomentverläufe bei Anliegen eines entsprechenden Referenz-Drehmoments, und
• 7 zeigt den Signalverlauf der Drehmomentsensorik bei einem vorhandenen Störfeld.

Show it:

• 1 a torque sensor for 2-band measurement in a schematic representation, in side view,
• 2 a torque sensor system for 2-band measurement in a first embodiment with two carrier boards distributed circumferentially around a shaft, in a schematic representation, in an axial top view,
• 3 a torque sensor system for 2-band measurement in a second embodiment with four carrier boards arranged circumferentially distributed evenly around a shaft in a schematic representation, in an axial top view
• 4 the torque sensor system according to the invention in a development with a preferred coil arrangement and connection, in a possible embodiment, in a schematic representation,
• 5 according to the torque sensor system according to the invention 3 , in a development with a preferred coil arrangement and connection, the coils being distributed over a total of four carrier boards,
• 6 the signal curves of the driver signals and measured torque curves when a corresponding reference torque is applied, and
• 7 shows the signal curve of the torque sensors with an existing interference field.

1 shows a torque sensor 1 for 2-band measurement in a schematic representation, in a side view. The one in the 1 The torque sensor system 1 illustrated comprises a shaft 2 designed as a metal shaft with a first axial magnet section 21 designed in a closed ring shape and with a second axial magnet section 22 designed in a closed ring shape and arranged at an axial distance from the first magnet section 21. The first magnet section 21 is magnetized in a first circumferential direction and the second magnet section 22 is magnetized in a second circumferential direction, the first circumferential direction being oriented in the opposite direction to the second circumferential direction (see oppositely oriented circumferential arrows). On the shaft 2, the two magnet sections 21, 22 are magnetized onto the metal shaft as two opposite running magnetic tracks. The magnetic tracks are designed to be closed radially all the way around, so that ideally no magnetic field can be measured from the outside. The application of a torsional moment creates an axial magnetic field over the shaft 2, which is measured by the sensor units 100, 200, 300, 400 designed as magnetic field sensors. This magnetic field is directly proportional to the applied moment. Due to the opposing magnetic tracks, interference fields can be compensated accordingly.

2 shows a torque sensor 1 for 2-band measurement in a schematic representation, in an axial top view. In the 2 The sensor system shown has two carrier boards 3 which are circumferentially offset from one another by 180° and each have four individual sensor coils 101, 102, 201, 2002; 301, 302, 401, 402 on. A first sensor unit 100 and a second sensor unit 200 are arranged on a first carrier board 3 along a first longitudinal axis X1 parallel to the axis of rotation of the shaft 2 adjacent to the shaft 2, and a third sensor unit 300 and a fourth sensor unit 400 are on a second carrier board 3 along a second longitudinal axis X2 parallel to the axis of rotation of the shaft 2, circumferentially offset to the first longitudinal axis X1 adjacent to the shaft 2. The sensor coils arranged on the respective carrier boards are connected or connected to one another via an electrical line connection 4 . The sensor units 100 , 200 , 300 , 400 are connected to one another in such a way that two cross-acting sensor circuits SK1 , SK2 are created, which intersect in the axial center of the shaft 2 . Both sensor circuits SK1, SK2 are controlled simultaneously by a common control source Q, although each sensor circuit SK1, SK2 forms its own measurement path. the For this purpose, sensor circuits SK1, SK2 are connected in opposite directions and thereby generate an opposite sensor signal. The two sensor circuits SK1, SK2 thus provide redundancy in the sensor signal, so that the diagnostic capability of the circuit is significantly increased and deviations/errors can be detected more easily.

3 shows a torque sensor system 1 for 2-band measurement in an alternative embodiment, in a schematic representation, in an axial plan view. In the 3 The sensor system shown has a total of four carrier boards 3, which are circumferentially offset from one another by 90°, each with two individual sensor coils 101, 102; 201, 202; 301, 302; 401, 402 on. Two sensor units 100, 300; 200, 400 each have a common sensor circuit SK1, SK2. The sensor coils 101, 102, 201, 202; 301 , 302 , 401 , 402 of the sensor units 100 , 200 , 300 , 400 are connected to one another in such a way that two cross-acting sensor circuits SK1 , SK2 are created which intersect in the axial center of the shaft 2 . Similar to the execution in 2 Both sensor circuits SK1, SK2 are controlled simultaneously by a common control source Q, although each sensor circuit SK1, SK2 forms its own measurement path. For this purpose, the sensor circuits SK1, SK2 are connected in opposite directions and thus generate an opposite sensor signal. The two sensor circuits SK1, SK2 thus provide redundancy in the sensor signal, so that the diagnostic capability of the circuit is significantly increased and deviations/errors can be detected more easily.

4 shows the torque sensor system 1 according to the invention in a development with a preferred coil arrangement and wiring, in a possible embodiment, in a schematic representation, distributed on two diametrically opposite carrier boards 31, 32. As shown in the figure, along the same longitudinal axis X1; X2 arranged sensor units 100, 200 and 300, 400 each on a common carrier 31, 32 or on a common carrier board. From the 4 It can also be seen that the sensor coils 101, 201; 102, 202; 301, 401; 302, 402 of axially adjacent sensor units 100, 200; 300, 400 are interconnected in such a way that they move in the opposite direction and parallel to the respective associated longitudinal axis X1; X2 can be subjected to a common measuring current Imess. It is also shown that the sensor coils 101, 102; 201, 202; 301, 302; 401, 402 of each sensor unit 100, 200, 300, 400 are interconnected in such a way that they move in the opposite direction and parallel to the respective associated longitudinal axis X1; X2 can be subjected to a common measuring current Imess.

5 shows the torque sensor system 1 according to the invention in a development with a preferred coil arrangement and connection, in a possible embodiment, in a schematic representation distributed on four carrier boards 31, 32, 33, 34 distributed uniformly around the circumference on the longitudinal axes X1, X2, X3, X4. The interconnection of the individual sensor coils 101, 102; 201, 202; 301, 302; 401, 402 of each sensor unit 100, 200, 300, 400 is identical to in 4 circuit shown. Here is only the division of the individual sensor coils 101, 102; 201, 202; 301, 302; 401, 402 on a total of four carrier boards 31, 32, 33, 34 instead of on two sensor boards 31, 32, as in 4 shown, illustrated.

In the 4 and 5 each shows that the sensor coils 101, 102; 201, 202; 301, 302; 401, 402 of the sensor units 100, 200, 300, 400 are connected in such a way that a total of four sensor coils 101, 201, 401, 301; 102, 202, 402, 302 of different sensor units 100, 200, 400, 300 are connected to one another in series and at the two ends of the two paths connected in parallel there is a connection for the application of a first or a second driver signal Drive_A; Drive_B is present.

6 shows the signal curves of the driver signals Drive A, Drive B as well as measured torque curves Torque 1, Torque 2 when a corresponding reference torque Ref is applied. The inverse driver signals DriveA and DriveB, which come from your common driver or control source Q are fed and from the reference signal Ref resulting from the sensor circuits SK1 and SK2 of the sensor coils 101, 102; 201, 202; 301, 302; 401, 402 formed measurement signals Torque1, Torque2. It can also be seen that the control unit Q is provided for controlling the sensor units 100, 200, 300, 400 of the torque sensor system 1 with a first driver signal DriveA designed as a square-wave signal and with a second driver signal DriveB designed as a square-wave signal, the two driver signals DriveA; DriveB are formed inversely to each other. In this case, a first measurement signal Torque1 is generated, which has an essentially identical signal profile to the reference signal, while the second measurement signal Torque2, due to the circuit arrangement, in turn assumes an inverse signal profile thereto.

In 7 is based on an interference field signal S_Störfeld an interference field compensation by the torque sensors described above shown. The interference field compensation can be described as follows: $$=\frac{\left(+\right)+\left(\right)}{2}=\frac{+}{2}$$

The compensating field B _comp therefore results from the sum of the two coil fields B _S1 and B _S2 , in each case corrected for the earth's magnetic field B _Earth acting in one direction, divided by 2 (since there are two coil circuits). S_coil1 and S_coil2 designate measurement signals from two coils, S_Störfeld designates an interference field signal (for example the earth's magnetic field) and S_comp designates the compensated signal which has been corrected for the interference.

The invention is not limited to the embodiments shown in the figures. The foregoing description is therefore not to be considered as limiting but as illustrative. The following patent claims are to be understood in such a way that a mentioned feature is present in at least one embodiment of the invention. This does not exclude the presence of other features. If the patent claims and the above description define 'first' and 'second' feature, this designation serves to distinguish between two similar features without establishing a ranking.

reference list

1

torque sensors

2

wave

21

first magnet section

22

second magnet section

3

carrier/board

31

carrier board

32

carrier board

33

carrier board

34

carrier board

4

electrical wiring connection

100

first sensor unit

101, 102

sensor coils

200

second sensor unit

201, 202

sensor coils

300

third sensor unit

301, 302

sensor coils

400

fourth sensor unit

401, 402

sensor coils

X1

first longitudinal axis

X2

second longitudinal axis

X3

third longitudinal axis

X4

fourth longitudinal axis

imess

measuring current

DriveA, DriveB

driver signals

MP1

measurement path 1

MP2

measurement path 2

MP3

measurement path 3

MP4

measurement path 4

S_coil1

Measurement signal of a first coil

S_coil2

Measurement signal from a second coil

S_Störfeld

Signal of an interference field

S_comp

compensated signal

QUOTES INCLUDED IN DESCRIPTION

This list of the documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• EP 3364163 A1 [0002]
• EP 1716399 A1 [0002]
• DE 102017109532 A1 [0003]
• DE 202015105090 U1 [0004]

Claims (11)

Torque sensor system (1), comprising - a shaft (2) with a first annularly closed axial magnet section (21) which is magnetized in a first circumferential direction, and with a second annularly closed axial magnet section (22) which is magnetised in a second circumferential direction is magnetized, the first circumferential direction being in the opposite direction to the second circumferential direction, characterized in that - a first sensor unit (100) which is arranged adjacent to the shaft (2) along a first longitudinal axis (X1) parallel to the axis of rotation of the shaft (2), - a second sensor unit (200) arranged adjacent to the shaft (2) along the first longitudinal axis (X1) or along a second longitudinal axis (X2) parallel to the axis of rotation of the shaft (2), - a third sensor unit (300) arranged along a third longitudinal axis (X3) parallel to the axis of rotation of the shaft (2), circumferentially offset from the first longitudinal axis (X1) and/or second longitudinal axis (X2), adjacent to the shaft le (2) is arranged, and - a fourth sensor unit (400) along a fourth longitudinal axis (X4) parallel to the axis of rotation of the shaft (2), circumferentially offset to the first longitudinal axis (X1) and / or second longitudinal axis (X2) and/or third longitudinal axis (X3), adjacent to the shaft (2), each of the sensor units (100, 200, 300, 400) having two sensor coils (101, 102; 201, 202; 301, 302; 401, 402), and two sensor units (100, 200; 300, 400) arranged axially adjacent to each other are assigned to different magnet sections (21; 22) for detecting magnetic field changes that have been generated due to torsion of the shaft (2). . Torque sensors (1) according to claim 1 , characterized in that the sensor coils (101, 201; 102, 202; 301, 401; 302, 402) of axially adjacent sensor units (100, 200; 300, 400) arranged adjacent in the axial direction are connected in such a way that they operate in opposite directions and a common measurement current (Imess) can be applied parallel to the respective associated longitudinal axis (X1; X2). Torque sensors (1) claim 2 , characterized in that the sensor coils (101, 102; 201, 202; 301, 302; 401, 402) of each sensor unit (100, 200, 300, 400) are interconnected in such a way that they run in opposite directions and parallel to the respective associated longitudinal axis (X1; X2) can be supplied with a common measuring current (Imess). Torque sensor system (1) according to one of the preceding claims, characterized in that the sensor units (100, 200; 300, 400) arranged along the same longitudinal axis (X1; X2) are arranged on a common carrier (3), in particular on a common circuit board . Torque sensor system (1) according to one of the preceding claims, characterized in that the first longitudinal axis (X1) and the third longitudinal axis (X2) as well as the second longitudinal axis (X2) and the fourth longitudinal axis (X4) are arranged circumferentially offset by 180° to one another . Torque sensors (1) according to claim 5 , characterized in that the first longitudinal axis (X1) and the second longitudinal axis (X2) coincide to a common longitudinal axis (X1) and or that the third longitudinal axis (X3) and the fourth longitudinal axis (X4) to a common longitudinal axis (X2 ) are arranged coincidentally. Torque sensors (1) according to claim 5 , characterized in that the first longitudinal axis (X1) to the second longitudinal axis (X2) and the second longitudinal axis (X2) to the third longitudinal axis (X3) and the third longitudinal axis (X3) to the fourth longitudinal axis (X4) offset by 90° to each other are arranged. Torque sensor system (1) according to one of the preceding claims, characterized in that the sensor coils (101, 102; 201, 202; 301, 302; 401, 402) of the sensor units (100, 200, 300, 400) are connected in such a way that in two paths connected in parallel, a total of four sensor coils (101, 201, 401, 301; 102, 202, 402, 302) of different sensor units (100, 200, 400, 300) are connected in series with each other and at the two ends of the two connected in parallel Paths each have a connection to the task of a first or a second driver signal (DriveA; DriveB) is present. Torque sensors (1) according to claim 8 , characterized in that a control unit (3) is provided for controlling the sensor units (100, 200, 300, 400) of the torque sensor system (1) with a first driver signal (DriveA) designed as a square-wave signal and with a second driver signal (DriveB) designed as a square-wave signal ), whereby the two driver signals (DriveA; DriveB) are inversely formed to each other. Torque sensor system (1) according to one of the preceding claims, characterized in that the sensor coils (101, 102; 201, 202; 301, 302; 401, 402) of the sensor units (100, 200, 300, 400) are of identical design. Torque sensor system (1) according to one of the preceding claims, characterized in that the torque sensor system (1) is connected to a motor control device for controlling an electric drive machine in an electrically drivable motor vehicle, and the signals used to detect changes in the magnetic field due to torsion of the Wave (2) have been generated are used to control the electric drive machine.

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