The motor speed can be varied from zero rpm with to usually % of its complete rated rate whilst approximately 150% ranked torque can be accomplished at minimized speed. As a result of the high-speed switching regularities used in PWM inverters, all variable frequency drives induce shaft existing in AC motors. The changing frequencies of insulated-gate bipolar transistors (IGBT) utilized in these drives create voltages on the motor shaft throughout typical operation via electro-magnetic induction. Just How to Manage the Rate of an AC Motor

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