| 摘要 |
PURPOSE:To improve the controlling characteristic by varying a lead angle in response to the magnitude of an error signal and the speed of a rotor to control the torque, and decreasing the torque as the rotor phase approaches a target value. CONSTITUTION:A controller 15 controls a lead angle to increase a torque during operation when the absolute value of an error signal is large, and to decrease it when the absolute value becomes small, and controls to increase the angle when the rotating speed of the rotor is large. Thus, when the rotor phase is largely separated from the target value, it drives with a large torque and the torque is decreased as the rotor phase approaches the target value to obtain the torque characteristic irrespective of the rotor speed. |
