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    • 5. 发明授权
    • Motor starting circuit
    • 电机启动电路
    • US4804901A
    • 1989-02-14
    • US120334
    • 1987-11-13
    • John PertessisJoseph Knauer
    • John PertessisJoseph Knauer
    • H02P1/44
    • H02P1/44
    • A start circuit for an induction motor having a main winding and a start winding includes a sensor of main-winding current. A detector detects the level of main-winding current sensed by the sensor. The start circuit includes a reference generator driven by the level detector and providing a reference level proportional to an average value of main-winding current. The reference level can vary slowly in accordance with a long-term drift in magnitude of the main-winding current. A switch energizes and deenergizes the start winding in accordance with relative values of a signal of the detector and the reference level, thereby allowing for automatic restarting in the event of a sudden increase of current due to a motor stall.
    • 具有主绕组和起动绕组的感应电动机的起动电路包括主绕组电流传感器。 检测器检测传感器感测到的主绕组电流的电平。 启动电路包括由电平检测器驱动的参考发生器,并提供与主绕组电流的平均值成比例的参考电平。 参考电平可以根据主绕组电流的长度漂移而缓慢变化。 开关根据检测器的信号和参考电平的相对值激励和断电启动绕组,从而允许在由于电动机失速引起的电流突然增加的情况下自动重启。