| 摘要 |
PURPOSE:To suppress noise generation and the power consumption. CONSTITUTION:Concerning a controlling method for a motor which limits the input current of a controller for inverter control of the motor 4 of the compressor of an air conditioner, etc., the input current value of the controller is detected by a current detecting part 5. And, when this detected input current value reaches an operating current value (operating value) of a protective function of limiting the input current, the protective operation is performed by a microcomputer 6. And a timer 6c is started, when the rotation frequency of the rotor 4 is equal to or near a multiplex frequency of an input AC power source 1. And the protective operation is not released, even if the input current value reaches a releasing current value (releasing value) for a specified time (t) of up to time when this timer 6c is up. When the value of the input current reaches the releasing value after the passage of the specified time (t), the protective function is released. Consequently, the rotation frequency is prevented from frequently rising above or falling below the multiplex frequency of the AC power source 1. |
