| 摘要 |
PURPOSE:To enhance the efficiency of a motor by correcting the deceleration of a rotating speed due to an increase in a load by the increase of the operating frequency, thereby allowing the rotating speed to become coincident to the set rotating speed. CONSTITUTION:When the set rotating speed omegaM of a motor 2 is determined, an inverter section 1 is operated by the maximum efficiency operating frequency f1 solely determined from the rotating speed omega0. When a load of the motor 2 is light, the acceleration or deceleration of the rotating speed omega0 is corrected by the increase or decrease of the output voltage of the inverter section 1, thereby allowing it to become coincident to the set speed omegaM. When the load of the motor 2 is heavy, the output voltage of the inverter section 1 is fixed to the upper limit voltage, the deceleration of the actual rotating speed omega0 due to the increase in the load is corrected by the increase in the operating frequency, thereby allowing it to become coincident to the set rotating speed omegaM. |
