| 摘要 |
PURPOSE:To prevent a different phase of stator coil of a commutatorless motor from being conducting simultaneously by giving an output of driving element to carry current to a stator coil operating according to a signal from position detector to a position detector corresponding to an antecedent phase and thus stopping its detecting behavior. CONSTITUTION:Since a rotor pole has a pole width at 180 deg. in electrical angle, a time width of coil selecting signals Sa-Sc at 120 deg. in phase difference will stand at 180 deg. in electrical angle. However, power supply lines 7a-7c are connected to collectors of transistors 5b, 5c, 5a corresponding to the next phase, therefore, if the transistor 5b is turned on according to the selecting signal Sb generated from the detector 3b 120 deg. later than the coil selecting signal Sa from the position detector 3a, a collector potential is earthed and the power supply line 7a of the detector 3a of the antecedent phase is also earthed. A hole element bias voltage becomes zero and the detecting behavoir is stopped consequently. A similar operation is also conducted to the detectors 3b, 3c, and thus a different phase of stator coil is prevented from being conducting simultaneously. |
