Motor unit having a detector interposed between a motor and an arithmetic board
A motor unit is provided which shortens an information transmission path between a detector and an arithmetic board. The motor unit includes a motor and a motor controller controlling a rotating operation of the motor based on a rotating angle of the motor such that the motor and the motor controller form a unit. The motor controller includes a resolver detecting a voltage signal corresponding to the rotating operation of the motor. The resolver outputs the voltage signal corresponding to the rotating operation of the motor, to a control board. The resolver is interposed between the motor and the control board and detects a rotating angle of a shaft end of a motor shaft extending beyond an operation performing apparatus that performs an operation of supplying driving power to the motor, to a position closer to the control board.
1. A motor unit comprising:
a motor configured to perform a rotating operation; and
a control apparatus that controls the rotating operation of the motor based on a rotating angle of the motor, the motor and the control apparatus being housed in a common housing as a unit, the control apparatus having:
a detector that detects information changing in accordance with the rotating operation of the motor;
an information transmission path through which information detected by the detector is transmitted;
an arithmetic board that is provided so as to face the motor and that calculates the rotating angle of the motor using the information detected by the detector and transmitted via the information transmission path; and
a heat sink that promotes heat dissipation from the arithmetic board;
the motor including:
a motor shaft that allows rotation of the motor to be output to an outside; and
an end of the motor shaft on an opposite side from an output side that extends from the motor to a position in the control apparatus, which is closer to the arithmetic board than to the motor; and
a bearing that supports the end of the motor shaft on the opposite side from the output side, the bearing being fixed in a recess portion formed in an end surface of the heat sink which faces the arithmetic board,
wherein the detector is interposed between the motor and the arithmetic board and provided so as to detect the information changing in accordance with the rotating operation of the motor based on a rotating operation of the end of the motor shaft on the opposite side from the output side.
2. The motor unit according to claim 1 , wherein
the control apparatus includes an operation performing apparatus that performs an operation of supplying driving power to the motor,
the operation performing apparatus is interposed between the motor and the arithmetic board, and
the detector is provided closer to the arithmetic board than to the operation performing apparatus.
3. The motor unit according to claim 2 , wherein the heat sink promotes heat dissipation from the operation performing apparatus and is interposed between the motor and the detector.
4. The motor unit according to claim 1 , wherein the detector is fixed to the heat sink.
5. The motor unit according to claim 3 , wherein the operation performing apparatus is fixed to the heat sink.
6. The motor unit according to claim 1 , wherein the heat sink is fixed to the common housing.