| 摘要 |
<p>PURPOSE:To positively change over a motor to original synchronous operation from pulse starting even when restarting the motor from some number of revolution, by stopping a commutation device when the fundamental-wave components of the output voltage of the motor-generator reach set value, and by changing over the motor to original synchronous operation. CONSTITUTION:When starting a synchronous motor 6, a switch 41 of a commutation device 4 is closed, a switching appliance 8 is connected to the starting signal generator OSC side and the motor is pulse-started. The fundamental-wave components of output voltage are detected by means of an AC filter circuit FiL, which absorbs higher harmonic components contained in the output voltage of output winding 62 mounted to a voltage detector VD', a rectification circuit REC and a smoothing circuit SMT, the switching appliance 8 is changed over to the electric allotter DiS side while the switch 41 is opened when detecting voltage reaches set value, and the motor is changed over to original synchronous operation.</p> |
