| 摘要 |
PURPOSE:To save consumption of current in a step motor. without varying the holding position, by reducing the number of exciting phases without unbalancing torque produced in exciting windings. CONSTITUTION:When a motor is brought gradually into stopping state through a driving pulse T1 or T5, exciting vector varies to TV1 or TV5 and the motor is stopped at the driving pulse T5 so as to hold the motor M with exciting vector TV5=TE+TB+TD. When a power down signal ED is provided to an excitation controlling section 1, current in D and E phase windings is blocked to eliminate phase vectors TE, TD so as to hold the motor M only with the phase vector TB. Consequently, the winding current can be saved by 2/3 when the motor is stopped. |
