Magnet-based rotational angle sensor system

Abstract

The invention relates to a magnet-based rotational angle sensor system (10) for detecting a rotational movement of a shaft (1), comprising an excitation unit (12) having at least one excitation magnet (122), a Wiegand sensor unit (14) having a sensor coil (141) and at least one Wiegand wire (142) arranged in the sensor coil (141), a magnetic field sensor unit (16) and evaluation electronics (18), wherein: the excitation unit (12) is designed to be mounted for rotation with the shaft (1) and to generate an alternating excitation magnetic field at the position of the Wiegand sensor unit (14) and at the position of the magnetic field sensor unit (16) when the shaft (1) is rotated, the Wiegand sensor unit (14) is designed such that a Wiegand sensor voltage pulse (WP) is generated in the sensor coil (141) via the alternating excitation magnetic field, the magnetic field sensor unit (16) is designed to detect an alternating excitation magnetic field and to provide a corresponding magnetic field sensor signal (S), and the evaluation electronics (18) are designed to detect a Wiegand sensor voltage pulse (WP) and to determine a revolution (N) on the basis thereof, and to receive the magnetic field sensor signal (S) and to determine a rotation angle value (A) on the basis of the magnetic field sensor signal (S), the first compensation parameter (K1) and the second compensation parameter (K2) are provided to the evaluation electronics (18), and the evaluation electronics (18) are designed to alternately offset the received magnetic field sensor signal (S) with the first compensation parameter (K1) and the second compensation parameter (K2) when determining the rotational angle value (A).

Description

Summary of the invention

[0001] The invention relates to a magnet-based rotation angle sensor system for detecting a rotational movement of a shaft, comprising: an excitation unit having at least one excitation magnet, a Wiegand sensor unit having a sensor coil and at least one Wiegand wire arranged in the sensor coil, a magnetic field sensor unit, and evaluation electronics, wherein: the excitation unit is configured to be mounted to rotate together with the shaft, and when the shaft rotates, an alternating excitation magnetic field is generated at the location of the Wiegand sensor unit and at the location of the magnetic field sensor unit, the Wiegand sensor unit is configured so that Wiegand sensor voltage pulses are generated in the sensor coil by the alternating excitation magnetic field, the magnetic field sensor unit is configured to detect the alternating excitation magnetic field and is configured to provide a corresponding magnetic field sensor signal, and the evaluation electronics is configured to detect the Wiegand sensor voltage pulses and is configured to determine the number of revolutions based thereon, and is configured to receive the magnetic field sensor signal and is configured to determine a rotation angle value based on the magnetic field sensor signal.

[0002] Unless otherwise defined, the terms "axial", "radial" and "transverse" refer hereinafter to each of the shafts to be detected by the rotation angle sensor system, regardless of whether the rotation angle sensor system is mounted on the shaft. Therefore, unless otherwise stated, an axial direction is understood to mean a direction which runs parallel to the longitudinal axis of the shaft in the mounted state of the rotation angle sensor system, a radial direction is understood to mean a direction which runs perpendicular to the longitudinal axis of the shaft in the mounted state of the rotation angle sensor system, and a transverse plane is understood to mean a plane which runs transversely to the longitudinal axis of the shaft in the mounted state of the rotation angle sensor system.

[0003] A rotation angle sensor system is also referred to as a rotary encoder or a rotation angle encoder. In a general rotation angle sensor system, the Wiegand sensor unit and the magnetic field sensor unit are usually arranged at a small distance from each other, so that a significant interfering magnetic field is generated at the location of the magnetic field sensor unit due to the magnetization of the Wiegand wires of the Wiegand sensor unit that is always present during operation of the rotation angle sensor system. This leads to systematic errors in the magnetic field sensor signal provided by the magnetic field sensor unit and thus to systematic errors in the rotation angle value determined based on the magnetic field sensor signal.

[0004] Against this background, the object is to provide a reliable and accurate rotation angle sensor system for detecting a rotational movement of a shaft.

[0005] This object is achieved by a rotation angle sensor system for detecting a rotational movement of a shaft having the features of main claim 1 .

[0006] The rotation angle sensor system according to the invention for detecting a rotational movement of a shaft comprises an excitation unit, a Wiegand sensor unit, a magnetic field sensor unit and evaluation electronics.

[0007] The excitation unit comprises at least one permanent excitation magnet and is configured to be mounted to rotate with the shaft, wherein the rotational movement of the shaft is to be detected. Typically, the excitation unit is configured to be attached to the shaft, preferably to the end of the shaft. The at least one excitation magnet is configured and arranged in such a way that when the shaft rotates, and therefore when the excitation unit rotates, an alternating excitation magnetic field is generated at the location of the fixed Wiegand sensor unit and at the location of the fixed magnetic field sensor unit, meaning an excitation magnetic field whose polarity is continuously reversed, meaning that the (effective) direction of the field lines changes continuously over time.

[0008] The Wiegand sensor unit comprises a sensor coil and at least one Wiegand wire arranged in the sensor coil. Within the meaning of the present application, the Wiegand wire is also referred to as a pulse wire and generally has a hard magnetic sheath and a soft magnetic core, or vice versa. Under the influence of an external magnetic field, the magnetization direction of the Wiegand wire is suddenly reversed, thereby generating a short Wiegand sensor voltage pulse in the sensor coil radially surrounding the Wiegand wire, which can be detected via both ends of the sensor coil. This effect is called the Wiegand effect and is well known in the art. The Wiegand sensor unit generally comprises a single Wiegand wire, but may also have a plurality of Wiegand wires, all of which are arranged in the sensor coil. The Wiegand sensor unit, in particular the sensor coil and at least one Wiegand wire, is configured and arranged so that when the shaft rotates, the alternating excitation magnetic field generated by the excitation unit at the position of the Wiegand sensor unit generates a sequence of Wiegand sensor voltage pulses in the sensor coil, generally generating one Wiegand sensor voltage pulse for each alternation of the excitation magnetic field.

[0009] The magnetic field sensor unit is configured to detect an alternating excitation magnetic field and is configured to provide a corresponding magnetic field sensor signal. The magnetic field sensor unit may, for example, include a TMR sensor, a GMR sensor, an AMR sensor or a Hall sensor. Preferably, the magnetic field sensor unit and the Wiegand sensor unit are arranged on a common circuit board, wherein the magnetic field sensor unit and the Wiegand sensor unit are advantageously arranged on opposite sides of the circuit board relative to each other. The magnetic field sensor signal may, for example, be an analog signal whose amplitude is proportional to the field strength or orientation of the detected excitation magnetic field, or may, for example, be a digital signal comprising a sequence of magnetic field sensor signal values, each magnetic field sensor signal value being proportional to the field strength or orientation of the detected excitation magnetic field. Typically, the magnetic field sensor signal comprises a sine component and a cosine component, wherein the sine component is proportional to the field strength of the detected excitation magnetic field with respect to a first spatial direction, and the cosine component is proportional to the field strength of the detected excitation magnetic field with respect to a second spatial direction perpendicular to the first spatial direction. Typically, the magnetic field sensor signal is provided via one or more electrical contacts. However, in principle, the magnetic field sensor signal may be provided in any manner.

[0010] The evaluation electronics is electrically connected to the Wiegand sensor unit and is configured to detect the Wiegand sensor voltage pulses and based thereon determine the number of revolutions in a known manner, in particular based on the number of detected Wiegand sensor voltage pulses and their polarity. The evaluation electronics is also configured to receive a magnetic field sensor signal from the magnetic field sensor unit and is configured to determine the rotation angle value based on the magnetic field sensor signal in a known manner. In order to transmit the magnetic field sensor signal, the evaluation electronics is usually electrically connected to the magnetic field sensor unit. Preferably, the evaluation electronics is arranged together with the magnetic field sensor unit and the Wiegand sensor unit on a common circuit board. The evaluation electronics usually includes at least one integrated circuit, in particular a so-called application specific integrated circuit (ASIC) and / or a so-called "field programmable gate array" (FPGA) and / or a microcontroller. However, in principle, the evaluation electronics can be formed by any circuit suitable for detecting the Wiegand sensor voltage pulses and determining the number of revolutions based thereon, and suitable for receiving the magnetic field sensor signal and determining the rotation angle value based thereon.

[0011] When the shaft rotates, the magnetization direction of the Wiegand wires of the Wiegand sensor unit changes continuously due to the alternating excitation magnetic field, resulting in different effects of the interfering magnetic field generated by the magnetized Wiegand wires on the magnetic field detected by the magnetic field sensor unit and therefore on the magnetic field sensor signal provided by the magnetic field sensor unit, depending on the current magnetization direction.

[0012] According to the invention, the first compensation parameter and the second compensation parameter are therefore provided to the evaluation electronics, and the evaluation electronics are configured to apply the first compensation parameter and the second compensation parameter alternately to the received magnetic field sensor signal when determining the rotation angle value, so as to compensate for the influence of two different magnetization directions of the Wiegand wires occurring during operation on the magnetic field sensor signal. This provides a reliable and accurate rotation angle sensor system. The two compensation parameters can in principle be implemented as a single compensation value or a vector of multiple compensation values. Typically, the received magnetic field sensor signal has a sine component and a cosine component, wherein the sine component is proportional to the field strength of the detected excitation magnetic field relative to the first spatial direction, and the cosine component is proportional to the field strength of the detected excitation magnetic field relative to the second spatial direction perpendicular to the first spatial direction. In this case, it is conceivable, for example, that each of the two compensation parameters includes a separate compensation value for the sine component and for the cosine component. It is also conceivable that one of the two compensation parameters is zero or a zero vector. Preferably, when the magnetic field sensor signal is used for calculation, the corresponding compensation parameter is added to the current magnetic field sensor signal value or subtracted from the current magnetic field sensor signal value. Thereby, a particularly simple compensation can be achieved. However, in principle it is also conceivable that the corresponding compensation parameters are multiplied, divided or applied in a more complex manner to the current magnetic field sensor signal value when applied to the magnetic field sensor signal. However, in any case, alternately, meaning successively, the first compensation parameter or the second compensation parameter is applied to the magnetic field sensor signal. Preferably, the evaluation electronics is configured to determine a current quadrant parameter based on the detected Wiegand sensor voltage pulses and / or the received magnetic field sensor signal, which quadrant parameter indicates in which 90° quadrant of a complete rotation of 360° the excitation unit rotating with the shaft is currently located, and to decide which of the two compensation parameters is to be applied to the magnetic field sensor signal based on the current quadrant parameter.

[0013] In principle, the two compensation parameters can be provided to the evaluation electronics in any suitable manner, for example also via a data interface from an external system. Preferably, however, the rotation angle sensor system according to the invention comprises an advantageously non-volatile data storage device, in which the first compensation parameter and the second compensation parameter are stored and to which the evaluation electronics have at least read access. This makes it possible, for example, to determine the two compensation parameters once on a test bench and then store them permanently in the data storage device. The data storage device can also be integrated, for example as a so-called flash memory, together with the evaluation unit in an integrated circuit or a microcontroller. However, it is also conceivable that the rotation angle sensor system has a data interface via which the compensation parameters stored in the data storage device can be changed later.

[0014] Typically, a Wiegand sensor voltage pulse is generated in the sensor coil each time the magnetization direction of the Wiegand wire changes. The occurrence of a Wiegand sensor voltage pulse therefore indicates a change in the magnetization direction of the Wiegand wire. Preferably, the evaluation electronics is therefore configured to change from applying the first compensation parameter to the received magnetic field sensor signal to applying the second compensation parameter to the received magnetic field sensor signal, or from applying the second compensation parameter to applying the first compensation parameter to the received magnetic field sensor signal, upon detection of the Wiegand sensor voltage pulse. This enables a simple and relatively reliable determination of the point in time at which a change from one compensation parameter to another compensation parameter should occur, without requiring special means for detecting or monitoring the current magnetization direction of the Wiegand wire.

[0015] As described above, the received magnetic field sensor signal usually has a sine component and a cosine component, wherein the sine component is proportional to the field strength of the detected excitation magnetic field with respect to a first spatial direction and the cosine component is proportional to the field strength of the detected excitation magnetic field with respect to a second spatial direction perpendicular to the first spatial direction. Since the Wiegand line is usually arranged substantially parallel to one of the two spatial directions, usually only the sine component of the magnetic field sensor signal or only the cosine component of the magnetic field sensor signal is significantly influenced by the interfering magnetic field generated by the Wiegand line. In order to be able to compensate for the influence of the interfering magnetic field particularly easily, the evaluation electronics is therefore preferably configured in this case to apply the first compensation parameter or the second compensation parameter only to the sine component or only to the cosine component.

[0016] Preferably, the evaluation electronics comprises an integrated circuit, particularly preferably an ASIC, which is configured to detect a Wiegand sensor voltage pulse and is configured to determine the number of revolutions based thereon, and a microcontroller, which is configured to receive a magnetic field sensor signal, is configured to determine a rotation angle value based on the received magnetic field sensor signal, and is configured to apply the first compensation parameter and the second compensation parameter alternately to the received magnetic field sensor signal when determining the rotation angle value. The detection of the Wiegand sensor voltage pulse and the determination of the number of revolutions, which essentially corresponds to an increment or decrement of a count value when a Wiegand sensor voltage pulse occurs, can be implemented particularly effectively by an integrated circuit, i.e. an ASIC, specially designed for this purpose. The integrated circuit is electrically connected to the Wiegand sensor unit so as to be able to detect the Wiegand sensor voltage pulse. The integrated circuit is usually also connected to a data storage device, wherein at least a count value reflecting the number of revolutions is stored in the data storage device. On the other hand, the determination of the rotation angle value based on the received magnetic field sensor signal using two compensation parameters can be implemented particularly effectively by a suitably programmed microcontroller.

[0017] Preferably, the integrated circuit is configured to provide a detection signal each time a Wiegand sensor voltage pulse is detected, and the microcontroller is configured to receive the detection signal and, in response to the detection signal, perform a change from applying the first compensation parameter to the received magnetic field sensor signal to applying the second compensation parameter to the received magnetic field sensor signal, or from applying the second compensation parameter to the received magnetic field sensor signal to applying the first compensation parameter to the received magnetic field sensor signal. This results in a particularly efficient rotation angle sensor system.

[0018] Integrated circuits configured to detect Wiegand sensor voltage pulses and configured to determine the number of revolutions based thereon usually already exist. In order to avoid the usually relatively expensive reconfiguration / redesign of the integrated circuit, in an alternative preferred embodiment of the invention, the microcontroller is therefore electrically connected to the Wiegand sensor unit and is configured to directly detect the Wiegand sensor voltage pulses and, upon detection of the Wiegand sensor voltage pulses, to perform a change from applying the first compensation parameter to the received magnetic field sensor signal to applying the second compensation parameter to the received magnetic field sensor signal, or from applying the second compensation parameter to the received magnetic field sensor signal to applying the first compensation parameter to the received magnetic field sensor signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Embodiments of the present invention are described below with reference to the accompanying drawings. It shows:

[0020] FIG. 1 schematically shows a rotation angle sensor system for detecting the rotational movement of a shaft according to the present invention, which is mounted on the shaft,

[0021] FIG. 2 schematically shows the connections between the components of the rotation angle sensor system in a preferred embodiment,

[0022] FIG. 3 schematically shows the connections between the components of the rotation angle sensor system in an alternative preferred embodiment, and

[0023] 4 schematically shows the time progression of a magnetic field sensor signal provided by the magnetic field sensor unit of the rotation angle sensor system of FIG. 1 , a compensated magnetic field sensor signal obtained by applying a compensation parameter to the magnetic field sensor signal, a Wiegand sensor voltage pulse generated in the Wiegand sensor unit of the rotation angle sensor system of FIG. 1 , and a detection signal provided by an integrated circuit of the rotation angle sensor system of FIG. 1 . DETAILED DESCRIPTION

[0024] 1 shows a rotation angle sensor system 10, which is arranged at an axial end of a shaft 1 in order to detect a rotational movement of the shaft 1. The rotation angle sensor system 10 comprises an excitation unit 12, which is attached to the shaft 1. The rotation angle sensor system 10 also comprises a Wiegand sensor unit 14, a magnetic field sensor unit 16 and evaluation electronics 18, which are arranged on a circuit board 20 attached to the housing part 2.

[0025] The excitation unit 12 includes a magnet carrier 121 attached to the front side of the shaft 1. The excitation unit 12 also includes two permanent excitation magnets 122, which are magnetized and arranged on the magnet carrier 121 so that when the shaft 1 rotates, the excitation magnets 122 generate an alternating excitation magnetic field at the position of the Wiegand sensor unit 14 and at the position of the magnetic field sensor unit 16.

[0026] The Wiegand sensor unit 14 is arranged on the axial side of the circuit board 20 away from the shaft 1, and includes a sensor coil 141 and a Wiegand wire 142 arranged in the sensor coil 141. The sensor coil 141 and the Wiegand wire 142 are configured and arranged so that a sequence of Wiegand sensor voltage pulses WP is generated in the sensor coil 141 by an alternating excitation magnetic field generated by the excitation magnet 122 when the shaft 1 rotates, as schematically shown in FIG. 4 , wherein the Wiegand sensor voltage pulses WP can be detected via both ends of the sensor coil 141.

[0027] The magnetic field sensor unit 16 is arranged on the axial side of the circuit board 20 facing the shaft 1 opposite to the Wiegand sensor unit 14. The magnetic field sensor unit 16 is configured to detect an alternating excitation magnetic field and, as schematically shown in FIG4 , provides a corresponding magnetic field sensor signal S having a sine component S1 and a cosine component S2 at an electrical contact intended for this purpose. In the present embodiment, the sine component S1 is proportional to the field strength of the detected excitation magnetic field with respect to a spatial direction parallel to the longitudinal axis of the Wiegand wire 142, and the cosine component S2 is proportional to the field strength of the detected excitation magnetic field with respect to a spatial direction perpendicular to the longitudinal axis of the Wiegand wire 142.

[0028] Evaluation electronics 18 include an integrated circuit 181 , a microcontroller 182 and a data storage device 183 .

[0029] The integrated circuit 181 is electrically connected to the Wiegand sensor unit 14 and is configured to detect the Wiegand sensor voltage pulse WP generated in the sensor coil 141. The integrated circuit 181 is also configured to determine the number of revolutions N based on the number and polarity of the detected Wiegand sensor voltage pulse WP and to store it in the data storage device 183.

[0030] The microcontroller 182 is electrically connected to the electrical contacts of the magnetic field sensor unit 16, which are intended to provide a magnetic field sensor signal S, and is configured to receive the magnetic field sensor signal S. The microcontroller 182 is also configured to read the first compensation parameter K1 stored in the data storage device 183 and the second compensation parameter K2 stored in the data storage device 183 from the data storage device 183. The microcontroller 182 is also configured to alternately apply the first compensation parameter K1 and the second compensation parameter K2 to the magnetic field sensor signal S, as schematically shown in FIG4, so as to determine the compensated magnetic field sensor signal S-comp. Specifically, the microcontroller 182 is configured to alternately add the first compensation parameter K1 and the second compensation parameter K2 to the sine component S1 of the magnetic field sensor signal S, so as to determine the compensated sine component S1-comp, which together with the cosine component S2 constitutes the compensated magnetic field sensor signal S-comp. The microcontroller 182 is also configured to determine the rotation angle value A based on the compensated magnetic field sensor signal S-comp and store it in the data storage device 183.

[0031] In a preferred embodiment of the rotation angle sensor system 10 schematically shown in FIG2 , as schematically shown in FIG4 , the integrated circuit 181 is configured to provide a detection signal D at an electrical contact intended for this purpose whenever a Wiegand sensor voltage pulse WP is detected. In this embodiment, the microcontroller 182 is electrically connected to the corresponding electrical contacts of the integrated circuit 181 and is configured to receive the detection signal D. Furthermore, the microcontroller 182 is in this case configured to change from adding the first compensation parameter K1 to the sinusoidal component S1 to adding the second compensation parameter K2 to the sinusoidal component S1 each time in response to receiving the detection signal D, and vice versa, i.e., to change from applying the first compensation parameter K1 to the magnetic field sensor signal S to applying the second compensation parameter K2 to the magnetic field sensor signal S each time, and vice versa.

[0032] In an alternative embodiment of the rotation angle sensor system 10 schematically shown in Fig. 3, the microcontroller 182 is electrically connected to the Wiegand sensor unit 14 and is configured to detect the Wiegand sensor voltage pulse WP generated in the sensor coil 141. Furthermore, the microcontroller 182 is configured in this case to change from adding the first compensation parameter K1 to the sinusoidal component S1 to adding the second compensation parameter K2 to the sinusoidal component S1, and vice versa, each time the Wiegand sensor voltage pulse WP is detected, i.e., to change from applying the first compensation parameter K1 to the magnetic field sensor signal S to applying the second compensation parameter K2 to the magnetic field sensor signal S, and vice versa.

[0033] Reference numerals list

[0034] 1 axis

[0035] 2 Shell parts

[0036] 10Rotation Angle Sensor System

[0037] 12 Excitation unit

[0038] 121 Magnet Carrier

[0039] 122 Excitation magnet

[0040] 14 Wiegand sensor units

[0041] 141 sensor coil

[0042] 142 Wiegand Line

[0043] 16 magnetic field sensor units

[0044] 18Evaluation Electronics

[0045] 181 Integrated Circuits

[0046] 182 Microcontroller

[0047] 183 Data storage device

[0048] 20 Circuit Boards

[0049] ARotation angle value

[0050] D Detection signal

[0051] K1, K2 compensation parameters

[0052] N revolutions

[0053] S Magnetic field sensor signal

[0054] S1 sine component

[0055] S2 cosine component

[0056] S-comp compensated magnetic field sensor signal

[0057] S1-comp compensated sinusoidal component

[0058] WP Wiegand sensor voltage pulse

Claims

1. A magnet-based rotation angle sensor system (10) for detecting the rotational movement of a shaft (1), comprising: - an excitation unit (12) having at least one excitation magnet (122), - a Wiegand sensor unit (14) having a sensor coil (141) and at least one Wiegand wire (142) arranged in the sensor coil (141), - a magnetic field sensor unit (16), and - evaluation electronics (18), in: - the excitation unit (12) is configured to be mounted to rotate together with the shaft (1) and is configured to generate an alternating excitation magnetic field at the position of the Wiegand sensor unit (14) and at the position of the magnetic field sensor unit (16) when the shaft (1) rotates, - the Wiegand sensor unit (14) is configured such that a Wiegand sensor voltage pulse (WP) is generated in the sensor coil (141) by the alternating excitation magnetic field, - the magnetic field sensor unit (16) is configured to detect the alternating excitation magnetic field and to provide a corresponding magnetic field sensor signal (S), and the evaluation electronics (18) is configured to detect the Wiegand sensor voltage pulses (WP) and to determine the number of revolutions (N) based thereon, and is configured to receive the magnetic field sensor signal (S) and to determine the rotation angle value (A) based on the magnetic field sensor signal (S), It is characterized in that A first compensation parameter (K1) and a second compensation parameter (K2) are provided to the evaluation electronics (18), and the evaluation electronics (18) are configured to apply the first compensation parameter (K1) and the second compensation parameter (K2) alternately to the received magnetic field sensor signal (S) when determining the rotation angle value (A).

2. The magnet-based rotation angle sensor system (10) according to claim 1 comprises a data storage device (183), in which the first compensation parameter (K1) and the second compensation parameter (K2) are stored and the evaluation electronics (18) can access the data storage device (183).

3. The magnet-based rotation angle sensor system (10) according to any one of the preceding claims, wherein: The evaluation electronics (18) is configured to change from applying the first compensation parameter (K1) to the received magnetic field sensor signal (S) to applying the second compensation parameter (K2) to the received magnetic field sensor signal (S), or from applying the second compensation parameter (K2) to the received magnetic field sensor signal (S) to applying the first compensation parameter (K1) to the received magnetic field sensor signal (S), when a Wiegand sensor voltage pulse (WP) is detected.

4. The magnet-based rotation angle sensor system (10) according to any one of the preceding claims, wherein: - the received magnetic field sensor signal (S) has a sine component (S1) and a cosine component (S2), and The evaluation electronics (18) are configured to apply the first compensation parameter (K1) or the second compensation parameter (K2) only to the sine component (S1) or only to the cosine component (S2).

5. The magnet-based rotation angle sensor system (10) according to any one of the preceding claims, wherein: The evaluation electronics (18) comprises: - an integrated circuit (181) configured to detect said Wiegand sensor voltage pulse (WP) and to determine said number of revolutions (N) based thereon, and - A microcontroller (182) configured to receive the magnetic field sensor signal (S), configured to determine the rotation angle value (A) based on the received magnetic field sensor signal (S), and configured to alternately apply the first compensation parameter (K1) and the second compensation parameter (K2) to the received magnetic field sensor signal (S) when determining the rotation angle value (A).

6. The magnet-based rotation angle sensor system (10) according to claim 5, wherein: - the integrated circuit (181) is configured to provide a detection signal (D) whenever a Wiegand sensor voltage pulse (WP) is detected, and -The microcontroller (182) is configured to receive the detection signal (D) and, in response to the detection signal (D), change from applying the first compensation parameter (K1) to the received magnetic field sensor signal (S) to applying the second compensation parameter (K2) to the received magnetic field sensor signal (S), or change from applying the second compensation parameter (K2) to the received magnetic field sensor signal (S) to applying the first compensation parameter (K1) to the received magnetic field sensor signal (S).

7. The magnet-based rotation angle sensor system (10) according to claim 5, wherein: The microcontroller (182) is configured to detect the Wiegand sensor voltage pulse (WP), and when the Wiegand sensor voltage pulse (WP) is detected, change from applying the first compensation parameter (K1) to the received magnetic field sensor signal (S) to applying the second compensation parameter (K2) to the received magnetic field sensor signal (S), or change from applying the second compensation parameter (K2) to the received magnetic field sensor signal (S) to applying the first compensation parameter (K1) to the received magnetic field sensor signal (S).

Images