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    • 2. 发明授权
    • Method and apparatus for controlling induction motors
    • 用于控制感应电动机的方法和装置
    • US5541488A
    • 1996-07-30
    • US226188
    • 1994-04-11
    • Madan BansalGregory I. RozmanWilliam S. HeglundShan-chin TsaiMario R. Rinaldi
    • Madan BansalGregory I. RozmanWilliam S. HeglundShan-chin TsaiMario R. Rinaldi
    • G01P3/48H02P21/14H02P7/00
    • G01P3/48H02P21/18
    • The present invention provides for detecting rotor speed through the use of sense coils on the stator teeth. Voltage ripples caused by the rotor slots is detected by combining the signals of several such sense coils so that the fundamental voltage signal is cancelled or rejected and only the ripple voltages remain, a signal proportional to rotor speed. Several alternative methods for implementing that technique are discussed herein. At low induction motor speeds, the present invention filters out the voltage ripples and incident third harmonics and instead estimates rotor speed from the fundamental voltage. When the induction motor is already being driven by a prime mover, the present invention selects a proper initial frequency command for initial motor start by identifying rotor speed from the PWM inverter. Further, the present invention provides for using a generator to control voltage to the induction motor, with a PWM inverter to control frequency signals to the induction motor.
    • 本发明提供了通过使用定子齿上的感测线圈来检测转子速度。 通过组合几个这样的检测线圈的信号来检测由转子槽引起的电压波纹,使得基波电压信号被抵消或者被拒绝,并且仅纹波电压保持为与转子速度成比例的信号。 这里讨论了用于实现该技术的几种替代方法。 在低感应电动机速度下,本发明滤除电压波纹和入射的三次谐波,并且从基波电压估计转子速度。 当感应电动机已经由原动机驱动时,本发明通过从PWM逆变器识别转子速度来选择用于初始电动机启动的适当的初始频率指令。 此外,本发明提供使用发电机来控制感应电动机的电压,通过PWM逆变器来控制到感应电动机的频率信号。