| 摘要 |
<p>The present invention provides for detecting rotor speed through the use of sense coils (240) on the stator teeth. Voltage ripples caused by the rotor slots (SC-1) is detected by combining the signals of several sense coils so that the fundamental voltage signal is cancelled or rejected and only the ripple voltages remain which is a signal proportional to speed. Further, the present invention provides for using a generator (220) to control voltage to the induction motor (222) with a PWM inverter (226) to control frequency signals to the induction motor (222).</p> |
