WO2013094236A1 - 回転角度検出装置 - Google Patents

回転角度検出装置 Download PDF

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Publication number
WO2013094236A1
WO2013094236A1 PCT/JP2012/063421 JP2012063421W WO2013094236A1 WO 2013094236 A1 WO2013094236 A1 WO 2013094236A1 JP 2012063421 W JP2012063421 W JP 2012063421W WO 2013094236 A1 WO2013094236 A1 WO 2013094236A1
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Prior art keywords
detection unit
magnetic detection
magnetic
arm
bridge circuit
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PCT/JP2012/063421
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English (en)
French (fr)
Japanese (ja)
Inventor
塚本　学
泰助 古川
川野　裕司
横谷　昌広
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三菱電機株式会社
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Priority to JP2013550143A priority Critical patent/JP5762567B2/ja
Priority to DE112012005322.2T priority patent/DE112012005322B4/de
Publication of WO2013094236A1 publication Critical patent/WO2013094236A1/ja

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/245—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train
    • G01D5/2451—Incremental encoders

Definitions

  • the present invention relates to a rotation angle detection device that detects a rotation angle of a rotation shaft or the like using a magnetoresistive effect element.
  • a magnetoresistive element is known in addition to a Hall element as a magnetic field magnetoelectric conversion element that detects a magnetic field applied from the outside.
  • Magnetoresistive elements include AMR (Anisotropic Magneto-Resistance) elements, GMR (Giant Magneto-Resistance) elements, and TMR (Tunnel Magneto-Resistance) elements. There are elements. In particular, GMR elements and TMR elements that can obtain a larger MR ratio than others are drawing attention.
  • Patent Document 1 discloses a GMR element and a TMR element having a spin valve structure.
  • a magnetoresistive effect element having a spin valve structure includes a ferromagnetic first thin film layer (free layer) and a second thin film layer (fixed layer) which are partitioned by a nonmagnetic thin film layer.
  • the magnetization direction of the ferromagnetic second thin film layer is fixed.
  • an antiferromagnetic thin film layer is attached to the ferromagnetic second thin film layer.
  • the antiferromagnetic thin film layer may be a ferromagnetic layer having high coercivity and high electrical resistance.
  • a magnet rotor equipped with a cylindrical magnet whose peripheral surface is multipolarized is rotated about an axis.
  • the sensor device is arranged at a position away from the peripheral surface of the cylindrical magnet by a predetermined distance r. Regions A and B are provided in the sensor device at the same interval as the magnetization width ⁇ of the cylindrical magnet, the magnetoresistive elements RA1 and RA2 are arranged in the region A, and the magnetoresistive elements RB1 and RB2 are arranged in the region B.
  • RA1, RA2, RB1, and RB2 are connected to form a bridge circuit.
  • FIG. 37 the cylindrical magnet on the circumferential surface of the magnet rotor is schematically described in a straight line.
  • the circumferential surface of the magnet rotor moves in the direction of the arrow with respect to the sensor device.
  • phase angle ⁇ shown in FIG. 37 indicates the phase relationship between the region A and the magnetic poles of the magnet rotor 1.
  • the phase angle ⁇ coincides with the angle of the magnetic field in the region A.
  • the phase angle ⁇ ′ shown in FIG. 40 indicates the angle of the magnetic field in the region B when the phase relationship between the region A and the magnetic pole of the magnet rotor 1 is ⁇ .
  • the resistance value changes in accordance with the angle of the magnetic field applied to the element.
  • the resistance values of the magnetoresistive effect elements RA1, RA2 and RB1, RB2 change substantially sinusoidally with the rotation of the magnet rotor. Therefore, the midpoint potentials V1 and V2 and the bridge output Vout of the bridge circuit shown in FIG. 38 have waveforms as shown in FIG.
  • FIG. 43 is an explanatory diagram showing in detail the angle of the magnetic field of the conventional rotation angle detection device.
  • the magnetic fields generated by the magnet rotor in the radial direction (x-axis direction in FIG. 43) and in the rotation direction (y-axis direction in FIG. 43) change substantially sinusoidally with respect to the phase angle.
  • the magnetic field amplitude differs between the rotational direction and the radial direction.
  • the amplitude P of the magnetic field in the radial direction is generally 1 to 2 times the amplitude Q of the magnetic field in the rotation direction. Therefore, the x-axis component Hx and the y-axis component Hy of the magnetic field at the phase angle ⁇ can be expressed by the following equations (1) and (2). Therefore, tan ⁇ representing the direction of the magnetic field at the phase angle ⁇ and the direction ⁇ of the magnetic field can be represented by the following equations (3) and (4), respectively.
  • FIG. 44 shows the relationship between the phase angle ⁇ and the magnetic field angle ⁇ sensed by the magnetoresistive effect element in the conventional rotation angle detection device when the ratio of the amplitudes of the magnetic field magnitudes in the radial direction and the rotation direction is different.
  • Q / P 1 to 0.5.
  • ⁇ ⁇ .
  • FIG. 46 and 47 are waveform diagrams showing changes in the output voltage of the conventional rotation angle detection device when the amplitude ratio of the magnitude of the magnetic field in the radial direction is different from that in the rotation direction.
  • FIG. 45 when the resistance value of the magnetoresistive element has a triangular waveform, a third-order harmonic component is added to the output voltage Vout of the bridge circuit, and the output waveform is distorted. The influence of the fifth and higher harmonics is small, and the third harmonic component is the main cause of distortion. If the output waveform is distorted and becomes a triangular wave as shown in FIG. 46 or a trapezoidal wave as shown in FIG. 47, accurate angle information cannot be obtained.
  • a rotation angle detection device that can detect a rotation angle without distortion by multiplying a rotation direction detection signal by a correction coefficient k.
  • An object of the present invention is to provide a rotation angle detection device capable of obtaining accurate angle information while reducing the circuit scale.
  • Another embodiment of the present invention is a rotation angle detection device, in which a north pole and a south pole are alternately magnetized along a circumferential surface with a magnetization width ⁇ , and a magnetic field generated by the rotor First to fourth magnetic detectors for detecting the first magnetic detector, the first magnetic detector and the fourth magnetic detector are disposed at the first detection position, and the second magnetic detector and the third magnetic detector are The first magnetic detection unit and the second detection position are arranged at two detection positions, the first detection position and the second detection position are provided at a distance L, and are connected in series between the first reference potential and the second reference potential.
  • the third magnetic detection unit, the second magnetic detection unit and the fourth magnetic detection unit connected in series are connected in parallel, and the first to fourth magnetic detection units constitute a bridge circuit, and the first magnetic detection unit and the first magnetic detection unit
  • the 4 magnetic detector, the second magnetic detector, and the third magnetic detector are respectively arranged on the arms where the bridge circuit intersects, and the first magnet
  • Another embodiment of the present invention is a rotation angle detection device, in which a north pole and a south pole are alternately magnetized along a circumferential surface with a magnetization width ⁇ , and a magnetic field generated by the rotor First to eighth magnetic detectors for detecting the first magnetic detector, the first magnetic detector and the fourth magnetic detector are disposed at the first detection position, and the second magnetic detector and the third magnetic detector are The fifth magnetic detection unit and the eighth magnetic detection unit are disposed at the third detection position, the sixth magnetic detection unit and the seventh magnetic detection unit are disposed at the fourth detection position, The first detection position and the second detection position are provided at a distance L12, the third detection position and the fourth detection position are provided at a distance L12, and the first detection position and the third detection position are separated by a distance L13.
  • a first magnetic detection unit and a third magnetic detection unit which are provided and connected in series between the first reference potential and the second reference potential
  • the second magnetic detection unit and the fourth magnetic detection unit connected in series are connected in parallel, and the first to fourth magnetic detection units constitute a bridge circuit, and the first magnetic detection unit and the fourth magnetic detection unit,
  • the second magnetic detection unit and the third magnetic detection unit are respectively disposed on the intersecting arms of the bridge circuit, and are connected in series between the third reference potential and the fourth reference potential.
  • Another embodiment of the present invention is a rotation angle detection device, in which a north pole and a south pole are alternately magnetized along a circumferential surface with a magnetization width ⁇ , and a magnetic field generated by the rotor First to eighth magnetic detectors for detecting the first magnetic detector, the first magnetic detector and the fourth magnetic detector are disposed at the first detection position, and the second magnetic detector and the third magnetic detector are The sixth magnetic detection unit and the seventh magnetic detection unit are arranged at the third detection position, the fifth magnetic detection unit and the eighth magnetic detection unit are arranged at the fourth detection position, The first detection position and the second detection position are provided at a distance L12, the third detection position and the fourth detection position are provided at a distance L12, and the first detection position and the third detection position are separated by a distance L13.
  • the third magnetic detection unit and the seventh magnetic detection unit are connected in parallel with the second magnetic detection unit, the sixth magnetic detection unit, the fourth magnetic detection unit, and the eighth magnetic detection unit that are connected in series.
  • the magnetic detection unit constitutes a bridge circuit.
  • the first magnetic detection unit and the fifth magnetic detection unit are arranged on the first arm of the bridge circuit, and the second magnetic detection unit and the second magnetic detection unit are arranged on the second arm of the bridge circuit.
  • a sixth magnetic detector is disposed, a third magnetic detector and a seventh magnetic detector are disposed on the third arm of the bridge circuit, and a fourth magnetic detector and an eighth are disposed on the fourth arm of the bridge circuit.
  • Another embodiment of the present invention is a rotation angle detection device, in which a north pole and a south pole are alternately magnetized along a circumferential surface with a magnetization width ⁇ , and a magnetic field generated by the rotor 2p + 1 magnetic detection units, each having two magnetic detection units arranged at 2p detection positions, i-th detection position (i is an integer of 1 or more) and j-th detection position (j Is an integer greater than or equal to 1), Lij, and between the first reference potential and the second reference potential, 2p magnetic detection units connected in series and 2p pieces connected in series
  • the magnetic detection units are connected in parallel, and the 2p + 1 magnetic detection units constitute a bridge circuit, and 2p-1 magnetic detection units are arranged on each arm of the bridge circuit.
  • FIG. 3 is a layout diagram of regions provided in the sensor device according to the first embodiment of the present invention. It is a wiring diagram of the magnetoresistive effect element in the rotation angle detection apparatus by Embodiment 1 of this invention. It is a wave form diagram which shows the change of the resistance value of a magnetoresistive effect element of the rotation angle detection apparatus by Embodiment 1 of this invention. It is a wave form diagram which shows the change of the output electric potential of the rotation angle detection apparatus by Embodiment 1 of this invention about the case where the arrangement space
  • FIG. 6 is a waveform diagram showing a difference between the output potential of FIG.
  • FIG. 9 is a waveform diagram showing a difference between the output potential of FIG. 8 and a sine wave whose DC component, amplitude, frequency, and phase are adjusted.
  • FIG. 13 is a waveform diagram showing a difference between the output voltage of FIG. 12 and a sine wave whose DC component, amplitude, frequency, and phase are adjusted.
  • FIG. 19 is a waveform diagram showing changes in the resistance value, midpoint potential, and differential voltage of the magnetoresistive effect element included in the bridge circuit A in the rotation angle detection device according to the third embodiment of the present invention with respect to the arrangement in FIG. 18.
  • FIG. 19 is a waveform diagram showing changes in the resistance value, midpoint potential, and differential voltage of the magnetoresistive effect element included in the bridge circuit B of the rotation angle detection device according to the third embodiment of the present invention with respect to the arrangement in FIG. 18.
  • FIG. 21 It is a wave form diagram which shows the change of a differential voltage and an output voltage of the rotation angle detection apparatus by Embodiment 3 of this invention about the arrangement
  • FIG. 25 is a waveform diagram showing changes in the resistance value, midpoint potential, and differential voltage of the magnetoresistive effect element included in the bridge A in the rotation angle detection device according to the third embodiment of the present invention with respect to the arrangement in FIG. 24.
  • FIG. 25 is a waveform diagram showing changes in the resistance value, midpoint potential, and differential voltage of the magnetoresistive effect element included in the bridge B of the rotation angle detection device according to the third embodiment of the present invention with respect to the arrangement in FIG. 24.
  • FIG. 27 is a waveform diagram showing the midpoint potential of FIG. 31 and the difference between the output voltage and a sine wave whose DC component, amplitude, frequency and phase are adjusted.
  • the magnetoresistive effect element whose magnitude of resistance changes depending on the direction of an applied magnetic field is used as a magnetic detection unit for detecting a magnetic field that changes as the magnet rotor rotates. explain. However, the same effect can be obtained even when other magnetic detection units are used.
  • the magnetoresistive effect element is simply referred to as “element”.
  • FIG. 1 is a configuration diagram of a rotation angle detection device of the present invention.
  • the rotation angle detection device 10 includes a magnet rotor 1 on which a cylindrical magnet 2 is mounted, and a sensor device 3 that senses a magnetic field generated by the cylindrical magnet 2.
  • the cylindrical magnet 2 has 2 m poles (m is an integer of 1 or more) in which N and S poles are alternately magnetized with a magnetization width ⁇ along the circumferential surface.
  • the sensor device 3 is arranged at a predetermined distance from the magnet rotor 1.
  • FIG. 2 is a layout diagram of regions provided in the sensor device according to the first embodiment of the present invention.
  • the sensor device 3 is provided with a region A and a region B with a distance L therebetween.
  • the element RA is arranged in the region A
  • the element RB is arranged in the region B
  • the distance between the elements RA and RB is also set to L.
  • the distance between regions is assumed to be equal to the distance between elements arranged in the region.
  • FIG. 3 is a wiring diagram of the magnetoresistive effect element in the rotation angle detection apparatus according to the first embodiment of the present invention.
  • elements RA and RB are connected in series between a DC power supply (VCC) and a ground (GND).
  • VCC DC power supply
  • GND ground
  • the distance L is expressed by the following formula (5), where ⁇ is the magnetization width of the cylindrical magnet 2.
  • ⁇ in FIG. 4 represents the phase angle of the magnet rotor 1, and is 360 ° for a magnetized single pole pair on the circumferential surface. The same applies to other drawings.
  • FIG. 6 shows a difference signal between the waveform of the output potential Vout shown in FIG. 5 and a sine wave.
  • the “sine wave” here is a sine wave in which the direct current component, amplitude, frequency, and phase are adjusted so that the difference from the output potential Vout is minimized.
  • FIG. 7 shows resistance values of the elements RA and RB to which the fifth-order harmonic component is added.
  • FIG. 9 shows a difference signal between the waveform of the output potential Vout and the sine wave shown in FIG.
  • the elements RA and RB are arranged at a distance of 2 / n times the magnetization width ⁇ , and the elements are arranged and connected as shown in FIG. It was found that harmonic components can be suppressed.
  • the cylindrical magnet 2 magnetized so as to generate a magnetic field that creates a magnetic flux density distribution in the circumferential direction is used.
  • the sensor device 3 is disposed above or below the magnetic pole with the axial direction as the vertical direction. The same applies to the following embodiments.
  • FIG. FIG. 10 is a wiring diagram of the magnetoresistive effect element in the rotation angle detecting device according to the second embodiment of the present invention.
  • the rotation angle detection device according to the present embodiment is different from the configuration of the first embodiment in that two elements are arranged in the regions A and B, respectively, and a bridge circuit configured by four elements is provided. Further, a differential amplifier 4 is provided in the bridge circuit. Other configurations are the same as those of the first embodiment.
  • two elements RA1 and RA2 are arranged in the area A of the sensor device 3, and two elements RB1 and RB2 are arranged in the area B, respectively.
  • the elements RA1 and RA2 are arranged so as to sense from the cylindrical magnet 1 magnetic fields having the same size and direction. This also applies to the case where two elements are arranged in the same region.
  • elements RA1, RB2, RB1, and RA2 are arranged in the first arm Arm1 to the fourth arm Arm4 of the bridge circuit, respectively.
  • the bridge circuit has a configuration in which the first arm and the fourth arm intersect and the second arm and the third arm intersect. That is, the elements arranged in the same region are arranged on the intersecting arms of the bridge circuit.
  • the first arm and the third arm are connected in series between the DC power supply (VCC) and the ground (GND), and the second arm and the fourth arm are similarly connected between the DC power supply (VCC) and the ground (GND). Connect the arm in series.
  • the first arm and the third arm are connected in parallel with the second arm and the fourth arm.
  • the midpoint potential of the first and third arms is V1
  • the midpoint potential of the second and fourth arms is V2.
  • the midpoint of the first arm and the third arm is connected to the inverting input terminal ( ⁇ ) of the differential amplifier 4
  • the midpoint of the second arm and the fourth arm is connected to the non-inverting input terminal (+) of the differential amplifier 4.
  • the signal processing unit 5 outputs the rotation angle of the magnet rotor 1 based on the output voltage Vout.
  • the resistance values of the elements RA1 and RB1 are triangular as shown by thin lines in FIG. It changes in a wave shape.
  • the elements RA1 and RA2 and the elements RB1 and RB2 are arranged so as to sense magnetic fields having the same magnitude and direction from the cylindrical magnet 1, so that the resistance values of the elements RA1 and RA2 are equal.
  • the resistance values of RB1 and RB2 are equal.
  • the midpoint potential V1 of the elements RA1 and RB1 corresponds to the midpoint potential Vout of the elements RA and RB of the first embodiment.
  • the output voltage Vout indicated by a bold line in FIG. 5 has a shape close to a sine wave.
  • the midpoint potential V2 has a shape close to a sine wave as shown by a thick line in FIG. The same applies to the midpoint potential V2 of the elements RA2 and RB2. Therefore, as shown in FIG.
  • FIG. 14 shows resistance values of the elements RA1 and RA2 and the elements RB1 and RB2 to which a fifth-order harmonic component is added.
  • FIG. 16 shows a difference signal between the waveform of the output voltage Vout shown in FIG. 15 and a sine wave.
  • elements RA1 and RA2 and elements RB1 and RB2 that sense the same magnetic field are arranged on the intersecting arms to constitute a bridge circuit. Therefore, out of the harmonic components added to the intermediate potentials V1 and V2, even-order harmonics have phases reversed between V1 and V2. Since the output voltage Vout is a differential output of V1 and V2, even-order harmonics cancel each other. Thereby, only the odd order should be considered for the harmonic component of the output voltage Vout resulting from the difference in amplitude of the magnetic field magnitude between the rotational direction and the radial direction. Further, even when external noise is added to the output voltage Vout, noise corresponding to the second harmonic component can be suppressed.
  • the regions A and B are arranged at a distance of 2/3 times the magnetization width ⁇ of the cylindrical magnet 2, thereby providing a third order. It was found that harmonic components are suppressed and the level of distortion can be reduced. Furthermore, since the bridge circuit is configured, second harmonic components such as external noise can be suppressed.
  • FIG. 17 is a wiring diagram of the magnetoresistive effect element in the rotation angle detecting device according to the third embodiment of the present invention.
  • the sensor device 3 is provided with four regions A to D, and two elements are arranged in each region.
  • the rotation angle detection device according to the present embodiment is different from the configuration of the second embodiment in that it has two bridge circuits and uses three differential amplifiers 4A to 4C. Other configurations are the same as those of the second embodiment.
  • the elements RA1 and RA2 are disposed in the region A of the sensor device 3, the elements RB1 and RB2 are disposed in the region B, the elements RC1 and RC2 are disposed in the region C, and the elements RD1 and RD2 are disposed in the region D.
  • the elements RA1 and RA2 are disposed in the region A of the sensor device 3
  • the elements RB1 and RB2 are disposed in the region B
  • the elements RC1 and RC2 are disposed in the region C
  • the elements RD1 and RD2 are disposed in the region D.
  • the bridge circuit A shown in FIG. 10 is configured using four elements RA1, RB1, RA2, and RB2. Further, the bridge circuit B is configured in the same manner as the bridge circuit A using the four elements RC1, RD1, RC2, and RD2. As shown in FIG. 17, the elements arranged in the same region are arranged on the intersecting arms of the bridge circuit.
  • the bridge circuit A is provided with a differential amplifier 4A
  • the bridge circuit B is provided with a differential amplifier 4B.
  • the differential amplifier 4A is connected to the inverting input terminal ( ⁇ ) of the differential amplifier 4C
  • the differential amplifier 4B is connected to the non-inverting input terminal (+) of the differential amplifier 4C.
  • the signal processing unit 5 outputs the rotation angle of the magnet rotor 1 based on the output voltage Vout.
  • the arrangement of the regions is determined so that harmonic components of two kinds of orders n1 and n2 can be suppressed.
  • L AB the distance between the region A and the region B is described as L AB .
  • FIG. 18 is a layout diagram of regions provided in the sensor device of the rotation angle detection device according to the third embodiment of the present invention.
  • FIG. 23 is an alternative view of the arrangement of regions provided in the sensor device of the rotation angle detection device according to the third embodiment of the present invention.
  • the same effect as the arrangement can be obtained. That is, when the arrangement of the areas C and D is reversed, the distance between the areas is equal to (2 ⁇ 2 ⁇ / n1). Similarly, when the arrangement of the areas A and B is reversed, the distance between the areas is equal to (2 ⁇ 2 ⁇ / n1). Furthermore, when the arrangement of the areas A and C is reversed, the distance between the areas is equal to (2 ⁇ 2 ⁇ / n2).
  • FIG. 24 is an alternative view of the arrangement of regions provided in the sensor device of the rotation angle detection device according to the third embodiment of the present invention.
  • FIG. 29 is an alternative view of the arrangement of regions provided in the sensor device of the rotation angle detection device according to the third embodiment of the present invention.
  • the same effect as the arrangement can be obtained. That is, when the arrangement of the areas A and B is reversed, the distance between the areas is equal to (2 ⁇ 2 ⁇ / n1). Similarly, when the arrangement of regions C and D is reversed, the distance between the regions is equal to (2 ⁇ 2 ⁇ / n1). Further, when the arrangement of the areas A and C is reversed, the distance between the areas is equal to (2 ⁇ 2 ⁇ / n2).
  • FIG. 30 is a wiring diagram of magnetoresistive elements in the rotation angle detection device according to the fourth embodiment of the present invention.
  • the number of regions provided in the sensor device 3 is increased to increase the number p of harmonic components that can be suppressed (p is an integer of 1 or more).
  • the rotation angle detection device according to the present embodiment is different from the second embodiment in that it has one bridge circuit and a plurality of elements are arranged in each arm of the bridge circuit. Other configurations of the present embodiment are the same as those of the second embodiment.
  • the sensor device 3 is provided with four regions A to D, and two elements are arranged in each region. Elements RA1 and RA2 are arranged in area A of sensor device 3, elements RB1 and RB2 are arranged in area B, elements RC1 and RC2 are arranged in area C, and elements RD1 and RD2 are arranged in area D, respectively.
  • elements RA1 and RD1 are provided in the first arm of the bridge circuit
  • elements RB2 and RC2 are provided in the second arm
  • elements RB1 and RC1 are provided in the third arm
  • elements RA2 and RD2 are provided in the fourth arm.
  • the bridge circuit has a configuration in which the first arm and the fourth arm intersect and the second arm and the third arm intersect. That is, the elements arranged in the same region are arranged on the intersecting arms of the bridge circuit.
  • the first arm and the third arm are connected in series between the DC power supply (VCC) and the ground (GND), and the second arm and the fourth arm are similarly connected between the DC power supply (VCC) and the ground (GND).
  • Each arm is connected in series.
  • the first arm and the third arm are connected in parallel with the second arm and the fourth arm. In addition, as long as it exists in the same arm, you may replace the order which connects an element.
  • the midpoint potential of the first and third arms is V1
  • the midpoint potential of the second and fourth arms is V2.
  • the midpoint of the first arm and the third arm is connected to the inverting input terminal ( ⁇ ) of the differential amplifier 4
  • the midpoint of the second arm and the fourth arm is connected to the non-inverting input terminal (+) of the differential amplifier 4.
  • the signal processing unit 5 outputs the rotation angle of the magnet rotor 1 based on the output voltage Vout.
  • FIG. 32 shows the difference between the output voltages Vout and Vout of the differential amplifier 4 and the sine wave. It can be seen that the output voltage Vout has a waveform substantially similar to a sine wave.
  • the configuration of this embodiment can suppress two types of harmonic components. Furthermore, there is an advantage that the number of differential amplifiers can be reduced as compared with the third embodiment.
  • FIG. 33 is an alternative view of the arrangement of regions provided in the sensor device of the rotation angle detection device according to the fourth embodiment of the present invention.
  • eight elements are arranged. By using twice as many as 16 elements, harmonic components of three kinds of orders can be suppressed.
  • the sensor device 3 is provided with eight regions A to H.
  • L AE 2 ⁇ / n 3 (n 3 is (Integer of 2 or more).
  • FIG. 34 is a wiring diagram of the magnetoresistive effect element in the rotation angle detection device according to the fourth embodiment of the present invention. Elements are arranged on the first to fourth arms of the bridge circuit as shown in FIG. In addition, as long as it exists in the same arm, you may replace the order which connects an element.
  • FIG. 35 is a table showing an example of the arrangement interval of each region and the wiring of each magnetoresistive element that can suppress p types of harmonic components in the rotation angle detection device according to the fourth embodiment of the present invention. According to this rule, harmonic components of four or more orders can be suppressed. In addition, as long as it exists in the same arm, you may replace the order which connects an element.
  • the arrangement interval and the wiring are only examples, and the p-type harmonic wave components can be suppressed by other configurations.
  • Regions (1) to (2 p ) are provided on the sensor device 3. Further, according to the rules of FIG. 35, the region (2 k m- (2 k -1 )) and region (2 k m- (2 k -1 ) +2 k-1), is disposed at a distance L k (K and m are integers of 1 or more). In the region (j), two elements R (j) 1 and element R (j) 2 are arranged (j is an integer of 1 or more). The distance L k is expressed by the following formula (6).
  • the elements R (1) 1 to R (2 p ) 1 and elements R (1) 2 to R (2 p ) 2 constitute a bridge circuit.
  • the bridge circuit has a configuration in which the first arm and the fourth arm intersect and the second arm and the third arm intersect.
  • the elements R (1) 1 to R (16) 1 correspond to the elements RA1 to RP1
  • the elements R (1) 2 to R (16) 2 correspond to the elements RA2 to RP2, respectively.
  • eight elements RA1, RD1, RF1, RG1, RJ1, RK1, RM1, RP1 connected in series are arranged.
  • Eight elements RB2, RC2, RE2, RH2, RI2, RL2, RN2, and RO2 are arranged on the second arm.
  • Eight elements RB1, RC1, RE1, RH1, RI1, RL1, RN1, and RO1 are arranged on the third arm.
  • Eight elements RA2, RD2, RF2, RG2, RJ2, RK2, RM2, RP2 are arranged on the fourth arm.
  • each arm has 2 p-1 elements.
  • the elements arranged in the same region are arranged on the intersecting arms of the bridge circuit.

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PCT/JP2012/063421 2011-12-20 2012-05-25 回転角度検出装置 WO2013094236A1 (ja)

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DE112012005322.2T DE112012005322B4 (de) 2011-12-20 2012-05-25 Drehwinkel-Detektiervorrichtung

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015008439A1 (ja) * 2013-07-17 2015-01-22 株式会社デンソー 回転センサ
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CN111693909A (zh) * 2019-03-12 2020-09-22 Ntn-Snr轴承股份有限公司 用于确定旋转构件的至少一个旋转参数的系统

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