JP2003161643A5 - - Google Patents

Claims (18)

  A permanent magnet fixed to the rotating body, a magnetic field detecting element attached to the fixed body so as to face the permanent magnet through a gap, the fixed body formed of a ring-shaped magnetic body, and the flow to the fixed body Angle and angular velocity integrated detection comprising a coil for detecting magnetic flux, a processing circuit for calculating an angle from a signal of the magnetic field detection element, and a processing circuit for calculating an angular velocity from the magnetic field detection element signal and the coil induced voltage signal apparatus.   The angle and angular velocity integrated detection device according to claim 1, wherein the permanent magnet is formed in a disc shape and is magnetized in one direction perpendicular to the axis of the rotating body.   The angle and angular velocity integrated detection device according to claim 1, wherein the magnetic field detection element is arranged on the outer peripheral side of the permanent magnet via a gap.   The angle and angular velocity integrated detection device according to claim 1, wherein the fixed body has a gap in a circumferential direction, and the magnetic field detection element is provided in the gap.   Two pairs of magnetic field detection elements in which the magnetic field detection elements are arranged at positions where the electrical angle is 180 degrees out of phase with each other are arranged in two pairs at positions where the electrical angles are 90 degrees out of phase with each other, and the angle signal processing circuit 5. A differential amplifier for processing a differential signal between magnetic field detection elements facing each other is provided to detect an absolute value of the position of the rotating body. The angle and angular velocity integrated detection device described in the above item.   Three pairs of magnetic field detection elements in which the magnetic field detection elements are arranged at positions that are 180 degrees out of phase with each other in electrical angle are arranged in positions where the electrical angles are 120 degrees out of phase with each other, and the angle signal processing circuit Is provided with a differential amplifier for processing a differential signal between the magnetic field detection elements facing each other, and a circuit for converting a three-phase signal obtained from three pairs of magnetic field detection elements into a two-phase signal. The angle and angular velocity integrated detection device according to any one of claims 1 to 4, wherein an absolute value is detected.   The angle and angular velocity according to any one of claims 1 to 5, wherein the coil includes two pairs of coils arranged so that the induced voltage signals to be detected are 90 degrees out of phase with an electrical angle. Integrated detection device.   The angle and angular velocity integrated detection device according to any one of claims 1 to 7, wherein two coils are used as a pair, and the winding width of each coil is 120 degrees in electrical angle.   The angle and angular velocity integrated detection according to any one of claims 1 to 8, wherein the coil is arranged at a position where an induced voltage signal to be detected is in phase with a signal of the magnetic field detection element. apparatus.   2. The coil according to claim 1, wherein four coils are arranged at positions equally divided into four in the circumferential direction of the fixed body, and are wound and coupled so that signals of coils facing each other have the same phase. The angle and angular velocity integrated detection device according to any one of 1 to 9.   2. The coil according to claim 1, wherein six coils are arranged at positions equally divided into six in the circumferential direction of the fixed body, and are wound and coupled so that signals of coils facing each other have the same phase. 10. The integrated angle and angular velocity detection device according to any one of 4, 6 and 9.   The angle and angular velocity integrated detection device according to claim 1, wherein the fixed body is formed by laminating thin plates. The angle and angular velocity integrated detection device according to any one of claims 1 to 12, wherein the fixed body is made of magnetic powder.   The angle and angular velocity integrated detection device according to any one of claims 1 to 13, wherein the fixed body is formed of a soft ferrite material.   The angle / angular velocity integrated detection apparatus according to claim 1, wherein the magnetic field detection element is a Hall effect element or a magnetoresistive element.   The angle / angular velocity integrated detection device according to claim 1, wherein the permanent magnet is a linear anisotropic magnet.   The angle and angular velocity integrated detection device according to any one of claims 1 to 16, wherein the permanent magnet is hollow. 18. A servo motor comprising the angle and angular velocity integrated detection device according to claim 1 incorporated therein.