Measuring device and method for determining angular position signal

Abstract

The measuring device (1) has a magnetic device (2) and a sensor device (3). The sensor device has at least three magnetic field sensors (5, 6, 7), each having an output (8, 9, 10) for outputting a magnetic field measurement signal. The output is connected to a first signal path in which a conversion device for converting a magnetic field measurement signal into a plurality of phase-shifted conversion signals is arranged. The output terminals (13, 14) for converting the signals are connected to an evaluation device (18). In the further signal path, a comparator (21) is arranged, which is connected to the measurement signal output of one of the magnetic field sensors in order to compare the magnetic field measurement signal of the one of the magnetic field sensors with a comparator threshold signal. The evaluation device has a phase comparison element (24, 24 ') for detecting a phase error, said phase comparison element having a first phase comparison element input (25) connected to the output connection of the conversion device and a second phase comparison element input (26) connected to the comparator output (23).

Description

Technical Field

[0001] The invention relates to a measuring device for determining an angular position signal, the measuring device comprising a magnetic device and a sensor device, the magnetic device and the sensor device being supported so as to be rotatable relative to one another about a geometric axis of rotation, wherein the sensor device comprises at least three magnetic field sensors arranged at an angle of rotation relative to one another with respect to the axis of rotation for generating magnetic field measurement signals that are phase-shifted relative to one another, the magnetic field sensors having a measurement signal output for outputting the magnetic field measurement signals, wherein the sensor device comprises a first signal path in which a conversion device is arranged for converting the at least three magnetic field measurement signals into a plurality of phase-shifted conversion signals, the number of which is smaller than the number of magnetic field sensors, wherein the measurement signal output of each magnetic field sensor is respectively connected to an input of the conversion device and the conversion device has respectively an output terminal for each conversion signal, and the output terminal is connected to an evaluation device, by means of which an angular position signal can be generated as a function of the conversion signal and can be output at an angular position signal output. The invention further relates to a method for determining an angular position signal, the method using a magnetic device and a sensor device, wherein the magnetic device and the sensor device are mounted so as to be rotatable relative to one another about an axis of rotation, wherein the sensor device has at least three magnetic field sensors which are arranged at an angle of rotation offset relative to one another with respect to the axis of rotation and for generating magnetic field measurement signals which are phase-shifted relative to one another, wherein the magnetic field measurement signals are converted into a plurality of phase-shifted conversion signals, the number of which is smaller than the number of magnetic field sensors, and the angular position signal is generated with the aid of the phase-shifted signals obtained in this way. Background Art

[0002] A device and a measuring method of the type mentioned at the outset are known from DE 10 2014 109 693 A1. In the measuring method, a magnetic device and a sensor device are provided, which are mounted so as to be rotatable relative to one another about a geometric axis of rotation. The sensor device has three magnetic field sensors which are rotationally offset relative to one another about the axis of rotation, so that the magnetic field sensors detect magnetic field measurement signals which are phase-shifted by 120 degrees relative to one another.

[0003] Two mutually orthogonal output signals are calculated from the three output signals of the magnetic field sensor by means of a conversion. In the case of continuous rotation of the magnetic device, two harmonics (sin, cos) are generated for the output signals, which are phase-shifted by 90 degrees. The angular position is then directly calculated from the two signals or from their instantaneous values ​​by means of an inverse tangent function in an analysis device suitable for this purpose. The device and the method are not limited to three magnetic field sensors and are primarily used to compensate for external interfering magnetic fields, which occur in particular in the field of application of automotive electronics. This enables a more precise measurement of the angular position. The accuracy of the angular position signal is increased by using more than three magnetic field sensors.

[0004] Many sensor devices also have the possibility of outputting signals in differential form, for which a device for phase switching (phase shift of 180°) is used. There are also circuits that exchange sin and cos signals and thus produce a jump or change of direction of n*90°. Such electronic circuits that affect the phase of the two output signals may work with errors due to the external interference field described or due to other sources. The external interference field appears here either as a uniform or gradient static magnetic field or in the form of a transient or periodic alternating field. It is precisely the latter that may lead to failures of the electronic circuit, while the former is more likely to distort the transmitter magnetic field or reference magnetic field provided by the magnetic device. The stability of the corresponding arrangement and the phenomena associated with it are generally summarized as the general term of electromagnetic compatibility (EMC). Therefore, the formation of an inverse tangent function from the two orthogonal output signals (sin, cos) leads to erroneous results for the angular position, even if the interference (distortion of the transmitter magnetic field) directly input into the useful signal and the measurement signal caused by EMC has been compensated by methods known in the prior art. Summary of the invention

[0005] The object of the present invention is therefore to detect erroneous influences on the phase in order to promptly identify erroneous calculations of the angular position. Conversely, a correct influence on the phase, which is required, for example, due to zero point calibration, increases the confidence level of the calculated angular position. This object is a requirement in safety-related applications, such as exist in many areas of vehicle technology.

[0006] With regard to a measuring device of the type mentioned at the outset, the object is achieved in that the sensor device has at least one further signal path, in which a comparator is arranged, the comparator being connected to a measurement signal output of at least one magnetic field sensor for comparing a magnetic field measurement signal of one of the magnetic field sensors or a combination of magnetic field measurement signals of a plurality of magnetic field sensors with a comparator threshold signal and having a comparator output for outputting a digital comparison value signal, the analysis device having a phase comparison element for identifying a phase error, the phase comparison element having a first phase comparison element input and a second phase comparison element input, the first phase comparison element input being connected to a first output terminal or an angular position signal output of the conversion device, and the second phase comparison element input being connected to the comparator output, and the phase comparison element having a phase comparison element output for outputting a phase difference signal.

[0007] The comparator threshold signal can be a non-differential or differential comparator threshold signal. For the voltage value of the output signal of the connected magnetic field sensor determined by the comparator threshold signal, the digital comparator output is either switched to a digital level high (HIGH) (logic "1") or switched to a low (LOW) (logic "0") when it exceeds or falls below the comparator threshold signal. The digital comparison value signal formed in this way corresponds to a digital phase signal. Here, in the case of continuous rotational relative motion between the magnet and the sensor device, the following digital output signal is involved, which is periodic and its period duration or frequency represents the phase of the output signal of the magnetic field sensor with respect to absolute time. In the case of the magnetic device rotating at a constant speed relative to the sensor device, the digital comparison value signal is a periodic signal with a constant frequency. In the case of a change in the angular velocity of rotation, the signal is still periodic, but the frequency can be changed according to the angular velocity of rotation. The magnetic device can be fixedly connected to the rotor of the drive device, whose angular position should be measured. In order to simplify the analysis and processing of the conversion signals, these conversion signals are preferably arranged orthogonally to each other.

[0008] Regarding the method, the above-mentioned task is solved by comparing a magnetic field measurement signal of at least one magnetic field sensor or a combination of magnetic field measurement signals of multiple magnetic field sensors with a threshold signal to generate a digital comparison value signal; and in order to identify a phase error, comparing the phase of at least one conversion signal or the phase of an angular position signal with the phase of the digital comparison value signal.

[0009] In an advantageous design of the present invention, the output terminal of the conversion device is indirectly connected to the analysis device via a phase shift device, wherein the phase shift device has a phase shifter output for each conversion signal, for outputting a phase shifted conversion signal shifted by a predetermined phase angle relative to the conversion signal involved, and wherein the phase shifter output is connected to the analysis device for generating an angle position signal. If each conversion signal is shifted by the same phase angle, the zero point calibration of the angle position signal can be performed in a simple manner during the use of the measuring device by the phase shifter. This is particularly advantageous in the following measuring device, in which the sensor device is implemented by a purely analog electronic circuit block. However, the first conversion signal and the second conversion signal can also be shifted by different phase angles by means of a phase shifter, so as to compensate for the phase errors of the conversion signals and in particular the orthogonality of the conversion signals. If interference that affects the phase occurs in the phase shift of the conversion signal, this can be determined by comparing the angle position signal with the edge of the digital comparison value signal or by comparing at least one of the conversion signals phase-shifted by means of a phase shifter with the edge of the digital comparison value signal.

[0010] In a preferred embodiment of the present invention, the analysis device has a phase difference signal monitoring device connected to the output of the phase comparison element in order to detect changes in the phase difference signal. When interference occurs in the first signal path, the first phase difference signal and / or the second phase difference signal changes, which is monitored by means of the phase difference signal monitoring device. This performs a credibility test on the first signal path and can detect errors in the signal processing that affect the phase of the output signal (e.g. sin, cos). If a phase error is determined, it can be displayed when necessary.

[0011] Advantageously, the phase difference signal monitoring device has a comparison device for comparing the change in the phase difference signal with a tolerance band. The tolerance band is preferably selected so that small deviations that have no adverse effect on malfunction or safety during operation of the measuring device are not detected as errors by the comparison device.

[0012] In a typical embodiment of the sensor device, the magnetic field sensor can be implemented as a Hall sensor, a TMR sensor, a GMR sensor or an AMR sensor.

[0013] In an expedient embodiment of the invention, the magnetic field sensor and the signal path are realized in such a way that they are integrally or hybridly integrated in a single cast IC housing.

[0014] In an alternative specific embodiment, the magnetic field sensor and the signal path are implemented discretely on the carrier.

[0015] According to an improved solution, the measuring device has at least one modulation device, which has a first input terminal directly or indirectly connected to one of the output terminals of the conversion device via a phase shift device, a second input terminal connected to the comparator output terminal of the other signal path, and a modulation signal output terminal, wherein the modulation signal output terminal is connected to the demodulation device of the analysis and processing device assigned to the modulation device. The advantage of this improved solution is that the comparator signal present at the comparator output terminal is transmitted together with the output signal of the conversion device or the phase shift device, for example as a DC component, for analysis and processing, and the analysis and processing or detection of the phase error can be carried out in an analysis and processing device separate from the measuring device.

[0016] Alternatively, the measuring device may have at least one operating current modulation device for the sensor device, the comparator output terminal of the other signal path being connected to the input terminal of the operating current modulation device, wherein the analysis and processing device is connected to the operating current demodulation device of the analysis and processing device assigned to the operating current modulation device. The advantage of this variant is that the digital comparison value signal can be transmitted to the analysis and processing device by modulating the operating current in order to carry out the analysis and processing or detection of the phase error there.

[0017] It should be noted that all signals of the sensor device can be implemented both as differential signals and as absolute value signals with a fixed reference potential. Description of the Drawings

[0018] In the following, the embodiments of the present invention will be explained in more detail with the aid of the drawings.

[0019] In the drawings:

[0020] Figure 1 shows a schematic overview diagram of the measuring device,

[0021] Figure 2 shows a block circuit diagram of a first embodiment of the measuring device,

[0022] Figure 3 shows a block circuit diagram of a second embodiment of the measuring device,

[0023] Figure 4 shows a block circuit diagram of a third embodiment of the measuring device,

[0024] Figure 5 shows a block circuit diagram of a fourth embodiment of the measuring device,

[0025] Figure 6 shows a graphical diagram of two sub-signals of a differential conversion signal, wherein time t is plotted on the abscissa and voltage U is plotted on the ordinate,

[0026] Figure 7 shows a graphical representation of a digital comparison value signal, wherein the time t is plotted on the abscissa and the voltage U is plotted on the ordinate,

[0027] Figure 8 shows a graphical representation of two sub-signals of a modulated differential conversion signal, wherein the time t is plotted on the abscissa and the voltage U is plotted on the ordinate, and

[0028] Fig. 9 A block circuit diagram of a fifth exemplary embodiment of a measuring device is shown. DETAILED DESCRIPTION

[0029] exist Figure 1 The measuring device 1 for determining an angular position signal, which is generally designated by 1, has a magnetic device 2 and a sensor device 3, which are mounted rotatably relative to each other about a virtual rotation axis 4 by means of a mounting device (not shown in detail in the figures). The magnetic device 2 has a north pole N and a south pole S, which are offset by 180° relative to each other with respect to the rotation axis 4. However, other embodiments are also conceivable, in which the north pole and the south pole are offset by an angle other than 180°, in particular by unequal angles.

[0030] The sensor device 3 has three magnetic field sensors 5, 6, 7 arranged on a semiconductor chip, which are arranged at an angular distance of 120° relative to the rotation axis 4 and are arranged at an angle offset relative to each other. However, other embodiments are also possible, in which the magnetic field sensors 5, 6, 7 are arranged at different angular distances relative to each other and are arranged at an angle offset relative to each other. This makes it possible to reduce harmonics of the angular position signal.

[0031] The semiconductor chip is arranged with its extension plane orthogonal to the rotation axis 4. The magnetic field sensors 5, 6, 7 are preferably located on a circular trajectory arranged concentrically with the rotation axis 4. When the magnetic device 2 rotates about the rotation axis 4 relative to the sensor device 3, the magnetic field sensors 5, 6, 7 generate magnetic field measurement signals that are phase-shifted with respect to one another. In order to output its magnetic field measurement signals, each magnetic field sensor 5, 6, 7 has a measurement signal output 8, 9, 10, respectively.

[0032] As in Figure 2As can be seen in FIG. 1 , the sensor device 3 has a first signal path 11 in which a conversion device 12 is arranged for converting three magnetic field measurement signals into two mutually orthogonal conversion signals. The conversion device 12 has a first input connected to the measurement signal output 8 of the first magnetic field sensor 5, a second input connected to the measurement signal output 9 of the second magnetic field sensor 6, and a third input connected to the measurement signal output 10 of the third magnetic field sensor 7. The conversion device 12 is designed to implement a Clarke transformation, which converts the magnetic field measurement signals into a sinusoidal first conversion signal (real part) and a cosine-shaped second conversion signal (imaginary part). The first conversion signal can be output at a first output terminal 13, and the second conversion signal can be output at a second output terminal 14.

[0033] The first output terminal 13 is connected to a first input of an evaluation device 18 and the second output terminal 14 is connected to a second input of the evaluation device 18. By means of the evaluation device 18, an angular position signal can be generated based on a first conversion signal present at the first output terminal 13 and a second conversion signal present at the second output terminal 14, which indicates a rotational position in which the magnetic device 2 is rotationally positioned relative to the sensor device 3 about the rotation axis 4. The angular position signal is determined in a calculation device 42 of the evaluation device 18 by calculating the arc tangent of the quotient obtained from the first conversion signal and the second conversion signal. The angular position signal can be output at an angular position signal output 19 of the evaluation device 18.

[0034] exist Figure 3 In the embodiment shown in, a phase shift device 15 is also arranged in the first signal path 11, and the phase shift device has a first phase shifter input and a second phase shifter input. The first phase shifter input is connected to the first output terminal 13 of the conversion device 12, and the second phase shifter input is connected to the second output terminal 14 of the conversion device 12. The zero point of the phase can be calibrated thereby. A first conversion signal (hereinafter also referred to as a first phase-shifted conversion signal) shifted at a predetermined phase angle can be output at a first phase shifter output 16, and a second conversion signal (hereinafter also referred to as a second phase-shifted conversion signal) shifted at a predetermined phase angle can be output at a second phase shifter output 17.

[0035] The first phase shifter output 16 is connected to a first input of an evaluation device 18, and the second phase shifter output 17 is connected to a second input of the evaluation device 18. With the aid of the evaluation device 18, an angular position signal can be generated from the phase shift conversion signals present at the first and second phase shifter outputs 16, 17, which angular position signal indicates a rotational position in which the magnetic device 2 is rotationally positioned relative to the sensor device 3 about the rotation axis 4. The angular position signal is determined in a calculation device 42 of the evaluation device 18 by calculating the arc tangent of the quotient resulting from the first phase shifter output 16 and the second phase shift conversion signal present at the second phase shifter output 17. The angular position signal can be output at an angular position signal output 19 of the evaluation device 18.

[0036] exist Figure 2 and Figure 3 In the embodiment shown in , the sensor device 3 also has a further signal path 20, in which a comparator 21 is arranged, which has a first comparator input, which is connected to the measurement signal output 8 of the first magnetic field sensor 5. The second comparator input, which is not shown in detail in the figure, is connected to a threshold value generator for comparing the magnetic field measurement signal of the first magnetic field sensor 5 with a comparator threshold signal. In order to output a digital comparison value signal 22, the comparator 21 has a comparator output 23, which is connected to a third input of the evaluation device 18. The comparator threshold signal of the threshold value generator can be, for example, at a potential corresponding to the middle of the supply voltage in the case of a non-differential measurement signal output 8 of the magnetic field sensor 5. In the case of a differential measurement signal output 8 of the magnetic field sensor 5, the comparator threshold signal can correspond to the polarity of the measurement signal output 8. The edges of the digital comparison value signal 22 can coincide with the zero crossings of the magnetic field measurement signal present at the measurement signal output of the first magnetic field sensor 5.

[0037] In order to detect the phase error, the evaluation device 18 has a phase comparison element 24. Figure 3 In the embodiment of the present invention, the phase comparison element 24 has a first phase comparison element input terminal 25 connected to the angle position signal output terminal 19, a second phase comparison element input terminal 26 connected to the comparator output terminal 23, and a second phase comparison element input terminal 27 for outputting a phase difference signal. The phase comparison element output terminal 27.

[0038] As in Figure 4 As can be seen in FIG. 2 , the first phase comparison element input 25 of the phase comparison element 24 ′ can also be connected to the phase shifter output 16 instead of the angle position signal output 19. Figure 2In the illustrated embodiment, the input terminal 25 of the first phase comparison element can also be connected to one of the output terminals 13, 14 of the conversion device instead of to the angle position signal output terminal 19.

[0039] In order to detect changes in the phase difference signal , the analysis and processing device 18 has a phase difference signal monitoring device 28, the input terminal of which is connected to the phase comparison element output terminal 27 of the phase comparison element 24. A signal indicating changes in the phase difference signal can be output at the output terminal of the phase difference signal monitoring device 28. This output terminal is connected to a comparison device 29, by means of which the changes in the phase difference signal can be compared with a pre-determined tolerance band. The result of the comparison can be output at the output terminal 30 of the comparison device 29 in the form of a digital fault signal.

[0040] In Figure 5 the illustrated embodiment, the measuring device 1 has two substantially identical modulation devices 31 and 32, each of which has two input terminals. The first input terminal of the first modulation device 31 is connected to the first phase shifter output terminal 16, and the second input terminal of the first modulation device 31 is connected to the comparator output terminal 23. The first modulation device 31 has a differential first modulation signal output terminal 33, which is connected to the differential first modulation signal input terminal 34 of a first demodulation device (not shown in detail in the drawing) of the analysis and processing device 18.

[0041] The first input terminal of the second modulation device 32 is connected to the second phase shifter output terminal 17, and the second input terminal of the second modulation device 32 is connected to the comparator output terminal 23. The second modulation device 32 has a differential second modulation signal output terminal 35, which is connected to the differential second modulation signal input terminal 36 of a second demodulation device (not shown in detail in the drawing) of the analysis and processing device 18.

[0042] In the demodulation device, the first phase shift conversion signal, the second phase shift conversion signal and the digital comparison value signal 22 are recovered from the modulated signal. Thereafter, a first phase difference value is determined for the phase difference between the phase of the angle position signal present at the angle position signal output terminal 19 and the phase of the digital comparison value signal 22 and compared with the tolerance range in order to check whether the angle position signal is correlated with the digital comparison value signal 22. Incorrect effects on the phase can be caused, for example, by EMV interference acting on the conversion device 12 and / or the phase shift device 15 and / or by random and / or systematic errors, for example in the integrated circuit of the sensor device 3. If for one of the conversion signals ( Figure 2 ) or one of the phase shift conversion signals ( Figure 3 ) if there is an erroneous influence on the phase, a fault signal is generated and output at the output 30 of the evaluation device 18.

[0043] As in Figures 6 to 8 As can be seen in FIG. 1 , the digital comparison value signal 22 ( Figure 7 ) as a DC component modulated to the two differential sub-signals 37, 38 of the first phase-shifted conversion signal which is phase-shifted with respect to the first conversion signal at a predetermined phase angle ( Figure 6 ) in each differential sub-signal. Figure 6 As can be seen in FIG. 3 , sub-signal 38 is equal to sub-signal 37 inverted. The first phase-shifted converted signal is equal to the difference between sub-signals 37 and 38. Figure 8 3 and 4. A modulated first sub-signal 39 and a modulated second sub-signal 40 are shown in FIG. 4. These signals are output at the first modulated signal output 33. The sum of the modulated sub-signals 39, 40 is equal to the digital comparison value signal 22.

[0044] In a corresponding manner, the digital comparison value signal 22 is modulated as a DC component to each of the two differential sub-signals of the second phase-shifted conversion signal by means of the second modulation device 32. The modulated first and second sub-signals thus obtained are output at the second modulation signal output terminal 35.

[0045] The evaluation device 18 calculates the angular position signal from the arctangent of the two phase-shifted converted signals and performs phase error detection with the aid of the modulated partial signals 39, 40. The basis for this is the formation of the phase difference signal The phase difference signal represents the phase relationship between the output signal of first signal path 11 and the output signal of further signal path 20. For this purpose, jumps or discontinuities 41 contained in modulated partial signals 39, 40 can be detected in the evaluation device by means known per se, such as low-pass filtering.

[0046] exist Fig. 9, another embodiment of a measuring device 1 is shown, in which the operating current required for the operation of the sensor device 3 is obtained from the analysis device 18 and is conducted from the analysis device to the sensor device 3 via an operating current modulation device 43. The operating current modulation device 43 has a control input, which is connected to the comparator output 23 of the further signal path 20 in order to modulate the digital comparison value signal 22 to the operating current of the sensor device 3. The analysis device 18 has an operating current demodulation device (not shown in detail in the figure) assigned to the operating current modulation device 42, by means of which the analysis device 18 can demodulate the digital comparison value signal 22 from the modulated operating current in order to carry out error detection by forming and analyzing a phase difference. In this embodiment, the phase shifter outputs 16, 17 of the first signal path 15 are directly connected to the analysis device 18.

[0047] It should be noted that in order to implement the method for phase error detection, it is not necessarily necessary to modulate the digital comparison value signal 22 onto the signals and lines that are already present. On the contrary, this is a suitable extension of the invention, which, at the level of the sensor device 3, saves additional lines / connections and correspondingly implemented connections, if necessary. This is the case, for example, if within the sensor device 3, the signal paths 11, 20 and the evaluation device 18 are implemented spatially separated, but connected via a cable harness. In contrast, in the case of a completely integrated integration, the evaluation device 18 is also included, according to Figure 2 or Figure 3 A direct connection is more advantageous.

Claims

1. A measuring device (1) for determining an angular position signal, the measuring device comprising a magnetic device (2) and a sensor device (3), the magnetic device and the sensor device being mounted so as to be rotatable relative to one another about a geometric axis of rotation (4), the sensor device (3) comprising at least three magnetic field sensors (5, 6, 7) arranged at an angle of rotation relative to one another with respect to the axis of rotation (4) for generating magnetic field measurement signals that are phase-shifted relative to one another, the magnetic field sensors (5, 6, 7) having measurement signal outputs (8, 9, 10) for outputting magnetic field measurement signals, the sensor device (3) comprising a first signal path (11) in which a magnetic field sensor is arranged. A conversion device (12) for converting the at least three magnetic field measurement signals into a plurality of phase-shifted conversion signals, the number of the conversion signals being less than the number of the magnetic field sensors (5, 6, 7), the measurement signal output end (8, 9, 10) of each magnetic field sensor (5, 6, 7) being respectively connected to an input end of the conversion device (12), and the conversion device (12) having an output terminal (13, 14) for each conversion signal, and the output terminals (13, 14) being connected to an analysis device (18), by means of which an angular position signal can be generated according to the conversion signal and can be output at an angular position signal output end (19), characterized in that: The sensor device (3) has at least one further signal path (20), in which a comparator (21) is arranged, which is connected to a measurement signal output (8, 9, 10) of at least one magnetic field sensor (5, 6, 7) for comparing a magnetic field measurement signal of one of the magnetic field sensors (5, 6, 7) or a combination of magnetic field measurement signals of a plurality of magnetic field sensors (5, 6, 7) with a comparator threshold signal and has a comparator output (23) for outputting a digital comparison value signal (22), wherein the comparator The analysis and processing device (18) has a phase comparison element (24, 24') for identifying a phase error, wherein the phase comparison element has a first phase comparison element input end and a second phase comparison element input end (25, 26), wherein the first phase comparison element input end (25) is connected to the first output terminal (13) of the conversion device (12) or the angular position signal output end (19) and the second phase comparison element input end (26) is connected to the comparator output end (23), and the phase comparison element (24, 24') has a first input end and a second input end for outputting a phase difference signal. The phase comparison element output terminal (27).

2. The measuring device (1) according to claim 1, characterized in that The output terminals (13, 14) of the conversion device (12) are indirectly connected to the analysis device (18) via a phase shift device (15), wherein the phase shift device (15) has a phase shifter output (16, 17) for each conversion signal for outputting a phase-shifted conversion signal shifted by a predetermined phase angle relative to the conversion signal concerned, and the phase shifter outputs (16, 17) are connected to the analysis device (18) for generating the angular position signal.

3. The measuring device (1) according to claim 2, characterized in that The analysis and processing device (18) is used to detect the phase difference signal The phase difference signal monitoring device (28) is connected to the output end (27) of the phase comparison element.

4. The measuring device (1) according to claim 3, characterized in that The phase difference signal monitoring device (28) has a function of A comparison device (29) is provided for comparing the change with the tolerance band.

5. The measuring device (1) according to any one of claims 1 to 4, characterized in that The magnetic field sensors (5, 6, 7) are designed as Hall sensors, TMR sensors, GMR sensors or AMR sensors.

6. The measuring device (1) according to any one of claims 1 to 5, characterized in that The magnetic field sensors (5, 6, 7) and the signal paths (11, 20) are realized in a monolithic or hybrid integrated manner in a single cast IC housing.

7. The measuring device (1) according to any one of claims 1 to 5, characterized in that The magnetic field sensors (5, 6, 7) and the signal paths (11, 20) are implemented discretely on a carrier.

8. The measuring device (1) according to any one of claims 1 to 7, characterized in that The measuring device (1) has at least one modulation device (31, 32), which has a first input connected directly or indirectly via the phase shift device (15) to one of the output terminals (13, 14) of the conversion device (12) and a second input connected to the comparator output (23) of the other signal path (20) and a modulation signal output (33, 35), and the modulation signal output (33, 35) is connected to a demodulation device of the analysis device (18) assigned to the modulation device (31, 32).

9. The measuring device (1) according to any one of claims 1 to 8, characterized in that The measuring device (1) has at least one operating current modulation device (43) for the sensor device (3), the comparator output (23) of the further signal path (20) being connected to the input of the operating current modulation device, and the analysis device (18) being connected to an operating current demodulation device of the analysis device (18) assigned to the operating current modulation device (43).

10. A method for determining an angular position signal, the method utilizing a magnetic device (2) and a sensor device (3), wherein: The magnetic device (2) and the sensor device (3) are supported in a manner that allows them to rotate relative to each other around a rotation axis (4), the sensor device (3) having at least three magnetic field sensors (5, 6, 7) arranged at an angle of rotation relative to each other about the rotation axis (4) for generating magnetic field measurement signals that are phase-shifted with respect to each other, converting the magnetic field measurement signals into a plurality of phase-shifted conversion signals, the number of which is less than the number of the magnetic field sensors (5, 6, 7), and generating an angular position signal with the aid of the phase-shifted signals obtained in this way, characterized in that the magnetic field measurement signal of at least one magnetic field sensor (5, 6, 7) or a combination of the magnetic field measurement signals of a plurality of magnetic field sensors (5, 6, 7) is compared with a threshold signal to generate a digital comparison value signal (22), and in order to identify a phase error, the phase of at least one conversion signal or the phase of the angular position signal is compared with the phase of the digital comparison value signal (22).

11. The method according to claim 10, characterized in that The magnetic field measurement signals are first converted into conversion signals which are phase-shifted with respect to one another, the conversion signals are then each shifted by a predetermined phase angle, and the angular position signal is generated from the phase-shifted conversion signals obtained in this way.

12. The method according to claim 10 or 11, characterized in that: To generate a phase difference signal - forming a difference between the phase of at least one conversion signal and the phase of the digital comparison value signal (22) or - forming a difference between the phase of the angular position signal and the phase of the digital comparison value signal (22) And the phase difference signal is detected changes.

13. The method according to claim 12, characterized in that The phase difference signal The change in the error is compared with the tolerance band and a fault signal is generated based on the comparison result.

14. The method according to any one of claims 10 to 13, characterized in that An angular position signal is generated in an analysis device (18), a phase of the digital comparison value signal (22) is compared with a phase of at least one switching signal in the analysis device (18), an operating current is supplied to the sensor device (3) via the analysis device (18), and the digital comparison value signal (22) is transmitted from the sensor device (3) to the analysis device (18) by modulating the operating current and is restored in the analysis device by demodulating the operating current.

15. The method according to any one of claims 10 to 13, characterized in that An angular position signal is generated in an analysis device (18); a phase of the digital comparison value signal (22) is compared with a phase of at least one conversion signal in the analysis device (18); the conversion signal is transmitted to the analysis device (18) as a differential signal; and the digital comparison value signal (22) is transmitted to the analysis device (18) by modulating a DC component of the conversion signal and is restored in the analysis device by demodulating the DC component.

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