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    • 3. 发明授权
    • Universal single phase motor starting control apparatus
    • 通用单相电机启动控制装置
    • US4486700A
    • 1984-12-04
    • US492538
    • 1983-05-09
    • Keith W. KawateJohn A. Haug
    • Keith W. KawateJohn A. Haug
    • H02P1/42H02P1/44
    • H02P1/42
    • A starting circuit for single phase electric motors including both split-phase and capacitor start motors includes a gate controlled solid state switch serially connected to the start winding of the motor. Rectified reference pulses from a pulse transformer are generated to turn on a first transistor to provide gating current for the solid state switch. Initially, when the motor is energized at zero rpm, the pulses are received at the switch after the start winding current passes through the zero current level to gate the switch to conduct each half cycle and energize the start winding however as the motor speeds up, the pulses are received earlier and earlier relative to the start winding current zero cross over until at a selected speed the pulses are received at the switch prior to the start winding current zero cross over with the result that the switch is no longer gated conductive. When this occurs the voltage across the switch goes high. This voltage is rectified and received at the base of a second transistor adapted to shunt the pulses from the pulse transformer away from the first transistor to lock out the switch with the start winding deenergized. In a first embodiment the pulse transformer is energized by the main winding current to directly employ the phase difference between main winding current and start winding current while in a second embodiment the pulse transformer is energized by line current to directly employ the phase difference between line current and start winding current.
    • 包括分相和电容起动电动机的单相电动机的启动电路包括串联连接到电动机起动绕组的门控固态开关。 产生来自脉冲变压器的整流的参考脉冲,以接通第一晶体管以为固态开关提供门控电流。 最初,当电机以零rpm通电时,在起动绕组电流通过零电流电平之后,开关处接收脉冲以对开关进行栅极导通每个半周期,并且在电机加速时给启动绕组通电, 脉冲相对于起始绕组电流零交叉更早和更早地接收,直到以选定的速度在开始绕组电流过零之前在开关处接收脉冲,结果是开关不再选通导通。 当这种情况发生时,开关上的电压变高。 该电压在第二晶体管的基极处被整流并接收,该第二晶体管适于将来自脉冲变压器的脉冲从第一晶体管分流,以将起动绕组断电时锁定开关。 在第一实施例中,脉冲变压器由主绕组电流通电,以直接采用主绕组电流和起动绕组电流之间的相位差,而在第二实施例中,脉冲变压器由线电流通电直接采用线路电流之间的相位差 并开始卷绕电流。