JP2014206431A - Rotation angle detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation angle detection device for improving the detecting accuracy of the rotation reference position of a rotation body.SOLUTION: A rotation angle detection sensor 10 includes: a detection element 11 for outputting a detection signal corresponding to the position of an outer peripheral part 31 of a magnetization rotor 30; a first comparator 14 for comparing the amplitude of the detection signal with a first threshold for detecting the rotation position of the magnetization rotor 30 to detect the rotation position of the magnetization rotor 30, and for outputting a rotation signal indicating the rotation position; a second comparator 15 for comparing the amplitude of the detection signal with a second threshold for detecting a rotation reference position to detect the rotation reference position, and for outputting a rotation reference signal indicating the rotation reference position. In this case, the second comparator 15 functions as exclusive determination means for detecting only the rotation reference position. Thus, it is possible to surely detect the rotation reference position.

Description

  The present invention relates to a rotation angle detection device that detects a rotation reference position of a rotating body.

  Conventionally, for example, Patent Document 1 proposes a determination device configured to detect a rotation reference position of a rotating body from a rotation signal of the rotating body detected by a sensor. The sensor outputs a rotation signal every time it faces a plurality of protrusions provided at equal intervals on the outer periphery of the rotating body. The rotating body is provided with a missing tooth portion having a protrusion. This missing tooth portion indicates the rotation reference position of the rotating body.

  Then, the determination device inputs a rotation signal from the sensor as needed, calculates a ratio of time intervals of the rotation signal, that is, a differential value of the time ratio of the rotation signal, and compares this differential value with a threshold value to detect the absence of the rotating body. Detect teeth. In this way, the determination device detects the rotation reference position of the rotating body.

JP 2012-167554 A

  However, in the above-described conventional technology, the determination device employs a method for determining a missing tooth portion using a time ratio of rotation signals. For this reason, there is a possibility that the differential value of the time ratio of the rotation signal exceeds the threshold value when the timing at which the determination device inputs the rotation signal from the sensor changes due to an instantaneous change in the rotation speed of the rotating body. . Therefore, there is a problem that the determination device erroneously detects the missing tooth portion. As described above, the conventional determination device has a problem that sufficient detection accuracy of the rotation reference position of the rotating body cannot be obtained.

  In view of the above points, an object of the present invention is to provide a rotation angle detection device that can improve the detection accuracy of the rotation reference position of a rotating body.

  In order to achieve the above object, according to the first aspect of the present invention, the rotation reference portion (33, 53, 54) showing the rotation reference position at the outer peripheral portion (31, 51) and a part of the outer peripheral portion (31, 51). Is a rotation detecting device configured to detect a rotation reference position with respect to the rotation of the rotating body (30, 50) provided with the following points, and is characterized by the following points. First, the rotation angle detection device is arranged so as to face the outer peripheral portions (31, 51) of the rotating bodies (30, 50), and outputs a detection signal corresponding to the position of the outer peripheral portions (31, 51). (11) is provided.

  Further, the rotation angle detection device rotates by comparing the amplitude of the detection signal with the first threshold value for detecting the rotation position of the rotating body (30, 50) by inputting the detection signal from the detection means (11). First determining means (14) for detecting the rotational position of the body (30, 50) and outputting a rotational signal indicating the rotational position is provided.

  Furthermore, the rotation angle detection device receives the detection signal from the detection means (11), detects the rotation reference position by comparing the amplitude of the detection signal with a second threshold value for detecting the rotation reference position, A second determination means (15) for outputting a rotation reference signal indicating the rotation reference position is provided.

  According to this, the rotation position of the rotating body (30, 50) can be detected by the first determination means (14). Further, only the rotation reference position of the rotator (30, 50) can be detected by the second determination means (15). For this reason, even if an instantaneous change in the rotation speed of the rotating body (30, 50) occurs, erroneous detection of the rotation reference position can be prevented. Therefore, the detection accuracy of the rotation reference position of the rotator (30, 50) can be improved.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is the figure which showed the rotation angle detection sensor and magnetized rotor which concern on 1st Embodiment of this invention. It is a block diagram of the rotation angle detection sensor which concerns on 1st Embodiment. It is a timing chart which showed operation of a rotation angle detection sensor concerning a 1st embodiment. It is the figure which showed the rotation angle detection sensor and magnetic body rotor which concern on 2nd Embodiment. It is a timing chart which showed operation of a rotation angle detection sensor concerning a 2nd embodiment. It is a timing chart which showed operation of a rotation angle detection sensor concerning a 3rd embodiment. It is the timing chart which showed the operation | movement which an arithmetic circuit part adds together a rotation signal and a rotation reference signal in 4th Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. The rotation angle detection device according to the present invention is configured as a rotation angle detection sensor that detects a crank angle in an internal combustion engine, for example. As shown in FIG. 1, the rotation angle detection sensor 10 is arranged with a predetermined gap so as to face the outer peripheral portion 31 of the magnetized rotor 30 fixed to the crankshaft 20 of the engine. The rotation angle detection sensor 10 is electrically connected to an ECU (Electrical Control Unit) 40 that performs various controls of the engine.

  The magnetized rotor 30 is a disk-shaped rotating body having a plurality of magnetization regions 32 in which N poles and S poles are alternately magnetized in the circumferential direction of the outer peripheral portion 31. An outer peripheral portion 31 of the magnetized rotor 30 is a side surface of the magnetized rotor 30 and has a planar shape. In addition, a rotation reference position indicating a rotation reference position is set in the magnetized rotor 30. In the present embodiment, the rotation reference position is a position where one of the plurality of magnetized regions 32 is formed so that the coercive force is larger than the other regions.

  The ECU 40 is mainly composed of a microcomputer and is configured to execute various engine control programs stored in a built-in ROM. In the present embodiment, the ECU 40 includes information on the rotation angle of the magnetized rotor 30 from the rotation angle detection sensor 10, information on the rotation reference position, a throttle opening sensor (not shown) installed in the engine, an intake pipe pressure sensor, and a cooling water temperature sensor. A signal is input from each sensor, and the like, and the fuel injection amount of the fuel injection valve, the ignition timing of the spark plug, the throttle opening (intake air amount) and the like are controlled according to the engine operating state.

  The rotation angle detection sensor 10 is a sensor that outputs to the ECU 40 a pulsed output signal corresponding to the position of the outer peripheral portion 31, that is, the crank angle, with the rotation of the magnetized rotor 30. The rotation angle detection sensor 10 is configured to detect a rotation reference position with respect to the rotation of the magnetized rotor 30. In the present embodiment, the rotation angle detection sensor 10 is configured as a crank angle sensor. As shown in FIG. 2, the rotation angle detection sensor 10 includes a detection element 11 and a processing circuit unit 12.

  The detection element 11 has a pair of magnetoresistive elements (not shown), for example. A pair of magnetoresistive elements are connected in series, and a power source is connected in series. The middle point 11 a of the pair of magnetoresistive elements is connected to the input terminal 13 of the processing circuit unit 12. In the present embodiment, a TMR element (Tunneling Magneto Resistance; TMR) is used as the magnetoresistive element.

  According to such a configuration, the pair of magnetoresistive elements change the resistance value according to the rotational position of the magnetized rotor 30, that is, the position of the magnetization region 32. As a result, the voltage at the middle point 11a of the magnetoresistive element changes. Therefore, the detection element 11 outputs a change in the voltage at the midpoint 11 a as a detection signal as the magnetized rotor 30 rotates. The detection signal is a waveform signal whose amplitude changes according to the rotational position of the magnetized rotor 30.

  Here, the magnetized rotor 30 includes the magnetized region 32 having a high magnetizing force indicating the rotation reference position as described above. For this reason, the amplitude of the detection signal corresponding to the magnetization region 32 having a high magnetization force is larger than the amplitude of the detection signal corresponding to the other magnetization region 32 magnetized to the same magnetic pole.

  Based on the detection signal input from the detection element 11, the processing circuit unit 12 generates a rotation signal indicating the rotation angle of the magnetized rotor 30, that is, a rotation position, and a rotation reference signal indicating the rotation reference position of the magnetized rotor 30. Each has a function to acquire. Such a processing circuit unit 12 includes a first comparator 14, a second comparator 15, and an arithmetic circuit unit 16.

  The first comparator 14 receives a detection signal from the detection element 11 and compares the amplitude of the detection signal with a first threshold value for detecting the rotational position of the magnetized rotor 30 to thereby determine the rotational position of the magnetized rotor 30. It is the determination means for detecting. The first threshold value is set to a median value between the maximum value and the minimum value of the amplitude of the detection signal when the rotation reference position is not considered. Therefore, the first comparator 14 binarizes the detection signal and outputs a rotation signal according to the rotation position of the magnetized rotor 30.

  The second comparator 15 is a determination means for detecting the rotation reference position by inputting the detection signal from the detection element 11 and comparing the amplitude of the detection signal with a second threshold value for detecting the rotation reference position. . The second threshold is set to a value larger than the first threshold. The second comparator 15 acquires the rotation reference position of the magnetized rotor 30 from the detection signal, and outputs a rotation reference signal indicating the rotation reference position.

  The arithmetic circuit unit 16 has a function of converting each signal input from each comparator 14, 15 into a predetermined pulse signal and outputting it to the ECU 40. Specifically, the arithmetic circuit unit 16 outputs the rotation signal acquired by the first comparator 14 as a first output from the first output terminal 17 to the ECU 40. The arithmetic circuit unit 16 outputs the rotation reference signal acquired by the second comparator 15 as a second output from the second output terminal 18 to the ECU 40.

  Next, the operation of the rotation angle detection sensor 10 according to this embodiment will be described. As shown in FIG. 3, most of the magnetization regions 32 of the magnetized rotor 30 are magnetized with the same magnetization force, but one magnetization region 32 is provided with a strong magnetization region 33 having a large magnetization force. ing. The strong magnetic force region 33 corresponds to a rotation reference portion indicating a rotation reference position.

  In FIG. 3, the outer peripheral portion 31 of the disk-shaped magnetized rotor 30 is drawn in a straight line. In the present embodiment, the strong magnetic force region 33 is provided in the magnetization region 32 where the detection signal exceeds the first threshold value.

  When the magnetized rotor 30 rotates, the amplitude of the detection signal increases and decreases in accordance with the passage of each magnetization region 32 with respect to the detection element 11. As described above, the processing circuit unit 12 acquires the detection signal from the detection element 11 based on the change of the magnetic pole in the outer peripheral portion 31 of the magnetized rotor 30. The first comparator 14 compares the amplitude of the detection signal with the first threshold value, and the second comparator 15 compares the amplitude of the detection signal with the second threshold value.

  For example, at time T10, the amplitude of the detection signal exceeds the first threshold, but does not exceed the second threshold. Therefore, the first comparator 14 generates a rotation signal of Hi. On the other hand, the second comparator 15 generates a rotation reference signal for Lo. The arithmetic circuit unit 16 outputs the rotation signal as a first output to the ECU 40 and outputs the rotation reference signal as a second output to the ECU 40.

  Subsequently, at time T11, the amplitude of the detection signal falls below both the first threshold value and the second threshold value. Accordingly, the first comparator 14 generates a Lo rotation signal, and the second comparator 15 generates a Lo rotation reference signal.

  Thereafter, at time T12, the comparators 14 and 15 perform the same operation as at time T10. At time T13 in the magnetization region 32, the magnetization force of the strong magnetization region 33 is larger than the magnetization force of the magnetization region 32, so the amplitude of the detection signal exceeds both the first threshold value and the second threshold value. . Therefore, the first comparator 14 generates a rotation signal of Hi. The second comparator 15 generates a rotation reference signal of Hi. As described above, since the second threshold value of the second comparator 15 is set to a value that does not detect the amplitude of the detection signal corresponding to the normal magnetic force, the second comparator 15 can detect only the rotation reference position. .

  At time T14, since the strong magnetic force region 33 is separated from the detection element 11, the amplitude of the detection signal exceeds the first threshold value but falls below the second threshold value. Therefore, the first comparator 14 generates a rotation signal of Hi. On the other hand, the second comparator 15 generates a rotation reference signal for Lo. At time T15 after this, each comparator 14 and 15 performs the same operation as time T11.

  As described above, in this embodiment, the processing circuit unit 12 receives the detection signal from the detection element 11, binarizes the detection signal by the first comparator 14, and detects the rotation reference position by the second comparator 15. It is a feature. Thereby, the rotation position, that is, the crank angle of the magnetized rotor 30 can be detected by the first comparator 14. Further, only the rotation reference position of the magnetized rotor 30 can be detected by the second comparator 15.

  Thus, since the second comparator 15 functions as a dedicated determination means for detecting only the rotation reference position, even if an instantaneous change in the rotation speed of the magnetized rotor 30 occurs, the rotation reference position is determined. It can be detected reliably. Further, since the second comparator 15 performs the determination using the dedicated second threshold value for detecting the rotation reference position, it is possible to prevent erroneous detection of the rotation reference position. Therefore, the detection accuracy of the rotation reference position of the magnetized rotor 30 can be improved.

  Furthermore, in the present embodiment, the rotation angle detection sensor 10 includes the dedicated second comparator 15 for detecting only the rotation reference position, so that the rotation reference position is detected immediately rather than being analyzed later. Can do.

  In this embodiment, the object to be measured is the magnetized rotor 30. Since no protrusion is provided on the outer peripheral portion 31 of the magnetized rotor 30, it is possible to prevent the arrangement of the magnetized rotor 30 and the detection element 11 from being limited by the height of the protrusion.

  As for the correspondence relationship between the description of the present embodiment and the description of the claims, the magnetized rotor 30 corresponds to the “rotor” of the claims, and the strong magnetizing magnetic field region 33 corresponds to the claims. Corresponds to the “rotation reference part”. The detection element 11 corresponds to “detection means” in the claims. Further, the first comparator 14 corresponds to “first determination means” in the claims, and the second comparator 15 corresponds to “second determination means” in the claims.

(Second Embodiment)
In the present embodiment, parts different from the first embodiment will be described. As shown in FIG. 4, in this embodiment, the measurement object of the rotation angle detection sensor 10 is a magnetic rotor 50 formed from a magnetic material. The magnetic rotor 50 is a disk-shaped rotating body having a plurality of protrusions 52 formed intermittently in the circumferential direction of the outer peripheral portion 51. The surface on which the protrusions 52 are formed in the outer peripheral portion 51 is a so-called baseline.

  Further, in the outer peripheral portion 31 of the magnetic rotor 50, a recess 53 is formed between any adjacent protrusions 52 among the plurality of protrusions 52. That is, the concave portion 53 is a portion where a part of the baseline is recessed. The concave portion 53 is provided only at one location on the magnetic rotor 50 and corresponds to the rotation reference position of the rotation of the magnetic rotor 50.

  The detection element 11 of the rotation angle detection sensor 10 is disposed with a predetermined gap so as to face the outer peripheral portion 51 of the magnetic rotor 50. The configuration of the processing circuit unit 12 is the same as that of the first embodiment.

  Next, the operation of the rotation angle detection sensor 10 according to this embodiment will be described. First, as shown in FIG. 5, the detection element 11 outputs a detection signal with a larger amplitude as the gap with the magnetic rotor 50 is smaller, and outputs a detection signal with a smaller amplitude as the gap with the magnetic rotor 50 is larger. To do.

  For this reason, in order to detect the protrusion 52 of the magnetic rotor 50, the first threshold value is set to the median value between the maximum value and the minimum value of the amplitude of the detection signal when the recess 53 is not taken into consideration. Then, the first comparator 14 determines whether or not the amplitude of the detection signal is larger than the first threshold value.

  On the other hand, in order to detect the concave portion 53 positioned farthest from the detection element 11, the second threshold value is set to a value smaller than the minimum value of the amplitude of the detection signal when the concave portion 53 is not considered. This is because the recess 53 is located further away from the base line. Then, the second comparator 15 determines whether or not the amplitude of the detection signal is smaller than the second threshold value.

  For example, at time T20, the amplitude of the detection signal exceeds the first threshold and does not fall below the second threshold. Therefore, the first comparator 14 generates a Hi rotation signal, and the second comparator 15 generates a Lo rotation reference signal. In addition, at time T21, the amplitude of the detection signal is lower than the first threshold value, but not lower than the second threshold value. Accordingly, the first comparator 14 generates the Lo rotation signal, and the second comparator 15 continues to generate the Lo rotation reference signal.

  The period from time T21 to time T24 is a period corresponding to the recess 53 of the magnetic rotor 50. At time T22 after time T21, the gap between the magnetic rotor 50 and the detection element 11 is the largest, so the amplitude of the detection signal is lower than both the first threshold value and the second threshold value. Accordingly, the first comparator 14 generates a Lo rotation signal, and the second comparator 15 generates a Hi rotation reference signal.

  Thereafter, at time T23, the next protrusion 52 is approaching, so the amplitude of the detection signal is below the first threshold but above the second threshold. Accordingly, the first comparator 14 generates a Lo rotation signal, and the second comparator 15 generates a Lo rotation reference signal. At the subsequent time T24, the comparators 14 and 15 perform the same operation as at the time T20.

  As described above, even when the detection target is the magnetic rotor 50 having the protrusions 52, only the rotation reference position of the magnetic rotor 50 can be accurately detected by the second comparator 15. As for the correspondence between the description of the present embodiment and the description of the claims, the magnetic rotor 50 corresponds to the “rotary body” in the claims, and the recess 53 of the magnetic rotor 50 is claimed. Corresponds to the “rotation reference” of the range.

(Third embodiment)
In the present embodiment, parts different from the first and second embodiments will be described. As shown in FIG. 6, in the present embodiment, in the magnetic rotor 50, a protrusion 54 is formed on one protrusion 52 of the plurality of protrusions 52. The protrusion 52 provided with the protrusion 54 is higher than the other protrusions 52. The convex portion 54 is a portion corresponding to the rotation reference position for the rotation of the magnetic rotor 50.

  For such a magnetic rotor 50, the first threshold value is set to the median value of the maximum value and the minimum value of the amplitude of the detection signal when the convex portion 54 is not considered. Then, the first comparator 14 determines whether or not the amplitude of the detection signal is larger than the first threshold value.

  On the other hand, in order to detect the convex portion 54 located closest to the detection element 11, the second threshold value is set to a value larger than the maximum value of the amplitude of the detection signal when the convex portion 54 is not considered. That is, the second threshold value is set to a value larger than the first threshold value. Then, the second comparator 15 determines whether or not the amplitude of the detection signal is larger than the second threshold value.

  Therefore, the comparators 14 and 15 according to the present embodiment correspond to the time T10 and the time T10 in FIG. 3 according to the first embodiment at the time T30, the time T31, the time T32, the time T33, the time T34, and the time T35 in FIG. The same operations as those at T11, time T12, time T13, time T14, and time T15 are performed.

  As described above, even when a protrusion 54 is provided on one protrusion 52 of the magnetic rotor 50, the second comparator 15 accurately detects only the rotation reference position of the magnetic rotor 50. can do. As for the correspondence between the description of the present embodiment and the description of the claims, the convex portion 54 of the magnetic rotor 50 corresponds to the “rotation reference portion” of the claims.

(Fourth embodiment)
In the present embodiment, parts different from the first to third embodiments will be described. In the present embodiment, as shown in FIG. 7, the arithmetic circuit unit 16 inputs the rotation signal from the first comparator 14 and also receives the rotation reference signal from the second comparator 15, and the rotation signal, the rotation reference signal, Is added to the ECU 40 and output to the ECU 40. Thereby, the output terminal of the processing circuit unit 12 can be made one.

  Here, “addition” when the arithmetic circuit unit 16 adds the rotation signal and the rotation reference signal means adding the amplitudes of the signals. In addition, “summation” includes both addition and subtraction. In the present embodiment, the arithmetic circuit unit 16 adds the amplitude of the rotation signal and the amplitude of the rotation reference signal.

  Therefore, as shown in FIG. 7, when the waveform of the detection signal is the first embodiment and the third embodiment, when the rotation signal and the rotation reference signal are added by the arithmetic circuit unit 16, it corresponds to the rotation reference position. The output waveform to be output is a two-stage output.

  As described above, the rotation signal and the rotation reference signal can be combined and output to the ECU 40 by the arithmetic circuit unit 16. For the correspondence between the description of the present embodiment and the description of the claims, the arithmetic circuit unit 16 corresponds to the “calculation means” of the claims.

(Other embodiments)
The configuration of the rotation angle detection sensor 10 shown in each of the above embodiments is an example, and is not limited to the configuration shown above, and may be another configuration that can realize the present invention. For example, when the rotation angle detection sensor 10 is applied to a vehicle, it may be applied to a sensor that detects a wheel speed or a cam angle. Moreover, the rotation angle detection sensor 10 can be applied not only to a vehicle but to what detects the rotation angle of a rotating body.

  The first threshold is normally set at the center of the maximum and minimum values of the amplitude of the detection signal. In order to avoid switching hysteresis of the detection signal, the first threshold is set to two determination values on the high side and the low side. It may be divided into

  Alternatively, the rotation angle detection sensor 10 may be configured to detect reverse rotation by arranging two detection elements 11 having the same configuration on the upstream side and the downstream side of the rotating body. Further, the output signal of the rotation angle detection sensor 10 may be a PWM signal or a digital signal.

  In the first embodiment, the strong magnetic force region 33 is formed in a part of one magnetization region 32, but the strong magnetic force region 33 may be formed in one entire magnetization region 32. Further, the magnetization region 32 indicating the rotation reference position is not limited to the strong magnetic force region 33, and the area or thickness of any one of the plurality of magnetization regions 32 is formed to be larger than the other magnetization regions 32. Also good.

  Further, the detection element 11 is not limited to a TMR element, and any of an AMR element (Anisotropic Magneto Resistance; AMR), a GMR element (Giant Magneto Resistance; GMR), and an SV-GMR element (spin-valve GMR; SV-GMR). It is. A Hall element may be used. The layout of the detection element 11 may be a full bridge circuit or a half bridge circuit.

  In the fourth embodiment, the arithmetic circuit unit 16 adds the amplitude of the rotation signal and the amplitude of the rotation reference signal, but the other may be subtracted from either one.

11 Detection element (detection means)
14 1st comparator (1st determination means)
15 Second comparator (second determination means)
30 Magnetized rotor (rotating body)
31 Peripheral part 33 Strong magnetic field (rotation reference part)

Claims (6)

For rotation of the rotating body (30, 50) provided with the outer peripheral portion (31, 51) and the rotation reference portion (33, 53, 54) indicating the rotation reference position at a part of the outer peripheral portion (31, 51) A rotation angle detection device configured to detect the rotation reference position,
A detecting means (11) arranged to face the outer peripheral portions (31, 51) of the rotating body (30, 50) and outputting a detection signal corresponding to the position of the outer peripheral portions (31, 51);
The detection signal is input from the detection means (11), and the rotation body (30) is compared by comparing the amplitude of the detection signal with a first threshold value for detecting the rotation position of the rotation body (30, 50). , 50), and a first determination means (14) for outputting a rotation signal indicating the rotation position;
The detection signal is input from the detection means (11), and the rotation reference position is detected by comparing the amplitude of the detection signal with a second threshold value for detecting the rotation reference position. Second determination means (15) for outputting a rotation reference signal indicating
A rotation angle detection device comprising: The rotating body is a magnetized rotor (30) having a plurality of magnetization regions (32) in which N and S poles are alternately magnetized in the circumferential direction of the outer peripheral portion (31),
The rotation reference position is a position where any one of the area, the magnetizing force, and the thickness of any one of the plurality of magnetized regions (32) is formed larger than the other regions. Item 2. The rotation angle detection device according to Item 1. The rotating body is a magnetic rotor (50) formed of a magnetic body and having a plurality of intermittent protrusions (52) formed in the circumferential direction of the outer periphery (51).
The rotation reference position is a position of a recess (53) formed between adjacent protrusions (52) of the plurality of protrusions (52) in the outer periphery (51). The rotation angle detection device according to claim 1. The rotating body is a magnetic rotor (50) formed of a magnetic body and having a plurality of intermittent protrusions (52) formed in the circumferential direction of the outer periphery (51).
The rotation reference position is a position of a convex portion (54) formed on one protrusion portion (52) of the plurality of protrusion portions (52) in the outer peripheral portion (51). The rotation angle detection device according to claim 1.   The rotation signal is input from the first determination means (14), the rotation reference signal is input from the second determination means (15), and the rotation signal and the rotation reference signal are added together to produce one output. The rotation angle detecting device according to any one of claims 1 to 4, further comprising a calculation means (16) for outputting as a signal.   The rotation angle detection device according to any one of claims 1 to 5, wherein the detection means (11) is any one of a TMR element, an AMR element, a GMR element, and an SV-GMR element.

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