Motor drive apparatus
AssigneeDenso Corporation
InventorsHiroki TOMIZAWA, Jirou Hayashi, Hiroshi Imai
Life of this patent
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Abstract
A motor drive apparatus includes a rear end frame between a motor case and a control unit case. A shaft of a motor unit is supported rotatably by a bearing fixed to the rear end frame. A first socket-spigot fitting surface formed on the rear end frame is fitted with a second socket-spigot fitting surface formed on a heat sink. A rotation angle sensor mounted on a control unit substrate attached to the heat sink is provided on the rotation axis of the shaft. The rotation angle sensor can thus accurately detect the magnetic field of a magnet provided at the end of the shaft.
Claims10
A motor drive apparatus comprising:
- a motor including a motor case of a cylindrical shape, a stator housed inside the motor case, a rotor provided rotatably relative to the stator, and a shaft provided on a rotation axis of the rotor;
- a control unit case provided at one axial side of the motor case in an axial direction;
- a control unit substrate housed in the control unit case and including a control circuit to control currents supplied to the motor;
- a rear end frame provided between the motor case and the control unit case;
- a bearing fixed to the rear end frame to support rotatably one end of side the shaft;
- a magnet provided at one axial end of the shaft extending from the bearing toward the control unit substrate, the magnet having different magnetic poles in a rotation direction;
- a rotation angle sensor provided on the control unit substrate to output a detection signal of a magnetic field of the magnet;
- and
- a positioning part formed on the rear end frame to fixedly place the control unit substrate in position thereby to provide the rotation angle sensor on the rotation axis of the shaft.
Dependencies are inferred from the claim text.