| 摘要 |
PURPOSE:To prevent the application of excessive force to a power transmission mechanism in the course of starting by passing a rotating speed corresponding to a twisting intrinsic oscillation at the time of starting a synchronous motor, interrupting a power source at the rotating speed exceeding the specific speed and then restarting it after a short time. CONSTITUTION:A synchronous motor is deenergized at the rotating speed N obtained by 2Nn-Na<N<Nd, where fp=fn, wherein fp represents variable torque frequency generated by the motor, fn represents, the twisting intrinsic oscillation of the shaft, and fa represents the frequency in which flucutation starts occurring at the power transmission unit having a gap, Nn represents the rotating speed when fp=fn, Na represents the rotating speed when fp=fa, and Nd represents the rotating speed in which the shaft variation torque response magnification is abruptly increased, and the motor is restarted at the time when the variable torque amplitude transmitted thereafter is less than the load torque at the rotating speed. |
