| 摘要 |
PURPOSE:To shorten a time for synchronizing a rotary phase signal with a rotary phase reference signal by providing a rotary pulse detector which outputs a rotary phase signal in response to a rotating phase and outputs a rotary speed signal, and a phase controller, and a speed modulator. CONSTITUTION:A speed controller 1 receives a rotary speed signal (c) from a rotary pulse detector 5, and speed modulation data (e) from a speed modulator 2, and generates a speed difference voltage (g). A motor driver 4 drives a motor 6 by a motor drive voltage (h) obtained by adding the voltage (g) from the controller 1 and a phase difference voltage (f) from a phase controller 3. If a phase difference between the signal (a) and a rotary phase signal (b) is large like a signal relation at the time of nonsynchronous motor (phase delay), the data (e) is varied to alter the signal (c). Thus, the rotary speed is varied in response to the rough phase difference to synchronize the signal (b) of the motor 6 with the signal (a) at a high speed. |
