| 摘要 |
A circuit device for controlling a three-phase asynchronous motor powered by a direct-current source comprising an inverter equipped with a drive stage controlled by a microprocessor unit so as to provide, during startup, a voltage whose frequency rises progressively to the working frequency. The microprocessor unit is able to decrease or increase the frequency of the motor supply voltage according to the voltage values detected by a voltage sensor, so as to keep the value of the torque close to the operating value. <IMAGE> |
