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The motor rate can be varied from zero rpm through to generally % of its full rated speed whilst as much as 150% ranked torque can be achieved at minimized rate. Because of the high-speed changing frequencies used in PWM inverters, all variable regularity drives generate shaft existing in AC electric motors. The switching frequencies of insulated-gate bipolar transistors (IGBT) utilized in these drives produce voltages on the motor shaft during regular operation through electromagnetic induction.