| 摘要 |
PROBLEM TO BE SOLVED: To provide an electronic throttle control device miniaturized on the whole. SOLUTION: In a motor 115, a stator 116 is provided with salient poles in a multiples of three, and magnetic pole sensors 119 are arranged at a set of three salient poles at the phase difference of 120 deg.. A coil 112 is a concentrated winding, and the whole of the coils is connected through Y-connection. The magnetic pole sensors 119 are arranged not at the center of the respective salient poles but in the state of being displaced in a reverse direction to the rotating direction of a rotor of the motor. The displacement angle generates torque in a forward direction except during high speed rotation which is in question, that is, even during low speed rotation if the pole sensors are arranged being displaced within a range up to an electrical angle of 30 deg. when the fundamental frequency of the motor is defined by an electrical angle of 360 deg.. Further, even in the case of a DC motor having a mechanical rectifier, a similar effect can be obtained by displacing the position of a brush by the same method.
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