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    • 19. 发明授权
    • Speed control means for squirrel-cage motor
    • 用于鼠笼式电机的速度控制装置
    • US4145645A
    • 1979-03-20
    • US731926
    • 1976-10-13
    • Lester A. PriceGerold E. SchmidLawrence A. Millonzi
    • Lester A. PriceGerold E. SchmidLawrence A. Millonzi
    • B66C13/26H02P23/10H02P25/20H02P3/24H02P7/48
    • B66C13/26H02P23/10H02P25/20
    • There is disclosed a squirrel-cage motor for a winch drive or other application and control means for operating the motor in hoist or lower directions at any one of a plurality of speeds in either direction. The motor and winch are provided with a load brake. In one embodiment, the stator comprises two stator windings having different numbers of poles to provide high speed (fewer poles) and low speed (more poles) windings. The control means comprises a direct current power source, an alternating current power source, means for connecting the sources to the stator windings so that different speed points and braking operations are achieved, and means for operating the load brake. Low speed results from simultaneously energizing the low speed winding and the high speed winding from the alternating current power source and the direct current power source, respectively. Intermediate speed results from energizing only the low speed winding from the alternating current power source. High speed results from energizing only the high speed winding from the alternating current power source. The control means includes time delay means to prevent connection of the alternating current source to the winding previously energized from the direct current source until arcing across a direct current contactor in the control means ceases during transition from low speed to higher speed.
    • 公开了一种用于绞盘驱动器的鼠笼式马达或用于以任一方向上的多个速度中的任一方向以起重或低速方向操作马达的其它应用和控制装置。 电机和绞车配有负载制动器。 在一个实施例中,定子包括具有不同极数的两个定子绕组,以提供高速度(较少极点)和低速(更多极)绕组。 控制装置包括直流电源,交流电源,用于将源连接到定子绕组的装置,使得实现不同的速度点和制动操作,以及用于操作负载制动器的装置。 低速分别由交流电源和直流电源同时激励低速绕组和高速绕组。 中速是由来自交流电源的低速绕组的通电而产生的。 高速只能从交流电源的高速绕组通电。
    • 20. 发明授权
    • Variable speed AC motor control circuit
    • 变速交流电机控制电路
    • US4079296A
    • 1978-03-14
    • US700679
    • 1976-06-28
    • Theodore E. DahlenRashmikant P. Shah
    • Theodore E. DahlenRashmikant P. Shah
    • H02P3/24H02P23/10H02P1/56
    • H02P23/10H02P3/24
    • A microfilm reader has a film transport mechanism driven by separate forward and reverse motors. During operation, the driven one of the motors receives full AC power for driving it at high speed. During low speed operation, the driven motor receives partial power during half-cycles of one polarity, but only minimal power during half-cycles of opposite polarity. The undriven motor is pulled by its associated reel as the film is unwound therefrom. A large capacitor, which is part of a series circuit including both the forward and reverse motors, charges while either motor runs. When a driven motor is stopped, the capacitor is discharged into both of the motors to provide a unipolar field which produces a braking torque. Thus, the capacitor discharge not only stops the driven motor quickly and efficiently, but also stops the undriven motor to maintain film tension.
    • 微缩胶片读取器具有由单独的正向和反向电动机驱动的胶片传送机构。 在运行期间,被驱动的电动机之一接收全速AC电力,以高速驱动。 在低速运行期间,从动电机在一个极性的半周期期间接收部分功率,但在相反极性的半周期期间仅接收最小功率。 随着薄膜从其中展开,未驱动的电动机被其相关联的卷轴拉动。 作为包括正向和反向电动机的串联电路的一部分的大电容器在电动机运行期间充电。 当驱动电动机停止时,电容器被放电到两个电动机中以提供产生制动转矩的单极场。 因此,电容器的放电不仅能快速,有效地停止从动电机,而且可以使未驱动的电动机停止维持膜的张力。