| 摘要 |
<p>PCT No. PCT/JP85/00679 Sec. 371 Date Jun. 7, 1987 Sec. 102(e) Date Jun. 7, 1987 PCT Filed Dec. 10, 1985 PCT Pub. No. WO87/01251 PCT Pub. Date Feb. 26, 1987.A Brushless motor with phase advance has a rotor having magnetic poll teeth, a stator having plural coils and facing the rotor across a gap, and a bearing for rotatably supporting the rotor. A position sensor is mounted on the stator and detects variations in the position of the rotor and converts said variations into an electrical signal which issues as a polyphase positional signal having an approximate sine-wave shape. A velocity detecting device converts the positional signal into a velocity signal. Electronic switching apparatus receives a step advance instruction signal from outside the motor and selects the polyphase positional signal corresponding to the step advance instruction signal. Phase advance circuitry advances the phase of the positional signal by using a sum of the velocity and the selected positional signal as the phase advance amount.</p> |
