Rotation angle detecting device
AssigneesDenso Corporation, Nippon Soken, Inc.
InventorsShinji Hatanaka, Kenji Takeda, Shigetoshi Fukaya
Life of this patent
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Abstract
A rotation angle detecting device is rotated by a rotating object via a gear mechanism to detect a rotation angle of the rotating object. The rotation angle detecting device includes a housing, a magnet rotor unit having a permanent magnet and a central hole, a magnetic sensor unit including a pair of magnetic sensor elements each of which detects magnetic flux density of a magnetic field generated by the permanent magnet in a direction different from the other, and a signal processor that calculates a rotation angle of the rotating object from the magnetic flux density. The magnetic rotor unit includes a mechanism for changing the magnetic flux density as the number of turns of the magnet rotor unit changes.
Claims27
A rotation angle detecting device rotated by rotating object via a gear mechanism to detect a rotation angle φ of the rotating object comprising:
- a housing;
- a magnet rotor unit having a permanent magnet and a central hole, said rotor unit is rotatably supported by the housing;
- a magnetic sensor unit including a pair of magnetic sensor elements each of which detects magnetic flux density Bx, By of a magnetic field generated by the permanent magnet in a direction different from the other, said magnetic sensor unit being supported by the housing to be disposed in the central hole to provide a pair of output signals corresponding to magnetic flux densities;
- and
- a signal processor for calculating a rotation angle φ of the rotating object from the magnetic flux density,
- wherein the magnetic rotor unit comprises means for changing the magnetic flux density as the number of turns of the magnet rotor unit changes.
Dependencies are inferred from the claim text.