Rotation Angle Detector and Torque Sensor
1 Assignment
0 Petitions
Accused Products
Abstract
A rotation angle detector includes: a multipolar magnet ring magnetized multipolarly along a circumferential direction, at least one magnetic sensor group including three magnetic sensors being placed along the circumferential direction of the multipolar magnet ring, and outputting angle information in association with the rotation of the multipolar magnet ring, the respective pieces of the angle information having a phase difference therebetween of 120 degrees in an electrical angle, and an arithmetic unit configured to calculate a rotation angle of the multipolar magnet ring based on the angle information outputted from the three magnetic sensors included in the magnetic sensor group.
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Citations
18 Claims
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1-10. -10. (canceled)
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11. A rotation angle detector comprising:
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a multipolar magnet ring magnetized multipolarly along a circumferential direction; at least one magnetic sensor group including N (N is a natural number of 3 or higher, except
4) magnetic sensors being placed along the circumferential direction of the multipolar magnet ring, and outputting angle information in association with the rotation of the multipolar magnet ring, the respective pieces of the angle information output from the N magnetic sensors having a phase difference therebetween of 360/N degrees in an electrical angle; andan arithmetic unit configured to calculate an average value of the angle information outputted from the N magnetic sensors included in the magnetic sensor group, and to calculate a rotation angle of the multipolar magnet ring based on the calculated average value, wherein the arithmetic unit is configured to offset the phase difference of the angle information outputted from the N magnetic sensors included in the magnetic sensor group, to calculate a total value of the angle information after offsetting, and to obtain the average value by dividing the calculated total value by N. - View Dependent Claims (15, 16, 17, 18)
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12. A rotation angle detector comprising:
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a multipolar magnet ring magnetized multipolarly along a circumferential direction; at least one magnetic sensor group including N (N is a natural number of 3 or higher, except
4) magnetic sensors being placed along the circumferential direction of the multipolar magnet ring, and outputting angle information in association with the rotation of the multipolar magnet ring, the respective pieces of the angle information output from the N magnetic sensors having a phase difference therebetween of 360/N degrees in an electrical angle;an arithmetic unit configured to calculate a rotation angle of the multipolar magnet ring based on the angle information outputted from the N magnetic sensors included in the magnetic sensor group; and an abnormality occurrence judgment unit configured to offset the phase difference from the angle information outputted from the N magnetic sensors, to calculate a total value of the angle information after offsetting, and to judge whether or not abnormality has occurred in any one of the N magnetic sensors based on the calculated total value. - View Dependent Claims (14)
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13. A rotation angle detector comprising:
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a multipolar magnet ring magnetized multipolarly along a circumferential direction; at least one magnetic sensor group including N (N is a natural number of 3 or higher, except
4) magnetic sensors being placed along the circumferential direction of the multipolar magnet ring, and outputting angle information in association with the rotation of the multipolar magnet ring, the respective pieces of the angle information output from the N magnetic sensors having a phase difference therebetween of 360/N degrees in an electrical angle;an arithmetic unit configured to calculate a rotation angle of the multipolar magnet ring based on the angle information outputted from the N magnetic sensors included in the magnetic sensor group; and an abnormal sensor identification unit configured to offset the phase difference from the angle information outputted from the N magnetic sensors, and to identify a magnetic sensor, in which abnormality has occurred, among the N magnetic sensors based on a difference between the angle information after offsetting with respect to two magnetic sensors selected from the N magnetic sensors out of all the angle information after offsetting.
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Specification