| 摘要 |
PURPOSE:To drive a synchronous motor in a specified direction even if pole sensors are few by updating a next phase offset quantity after the phase offset quantity is held when generated electromagnetic force is accelerated in the intended driving direction, and updating the next phase offset quantity directly when the acceleration is performed in the reverse direction. CONSTITUTION:When a synchronous motor can be driven in only one direction a thrust command in agreement with the direction, into which a motor is driven is imparted (101). The time for changing an offset quantity is initialized (102). Then, the initial setting of the offset quantity of a current phase is imparted (103). The phase of applied current is operated (104). After the operation, the polarity of acceleration is judged (105). When the polarity of the acceleration agrees with the by direction, into which driving is performed by the thrust command, the phase offset quantity is held for the specified time, and the time is judged (106). The next phase set quantity is updated (107). When the polarity does not agree, the next offset quantity of the next current phase is updated (108). The time is initialized (109) and specified. |
