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Variable frequency drives use a rectifier to "chop off" the top part of the ac wave, then use capacitors to "fill in" the gaps in the voltage, making a "near dc" power. They use IGBTs, a fancy term for a high speed, high current transistor, or electronic switch, to pulse the "near dc" power out to the motor, in a pattern that appears like ac to the motor.

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What is ac and DC current?

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capacitors allow ac current to flow.


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Dc current can be changed to Ac current by using an undulator.Wrong!The devices that change DC to AC are:an electronic power invertera mechanical motor-generator set (only used in very high power stationary applications)an electromechanical vibrator (now obsolete)


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Back EMF.


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if its already an ac y u need to convert!......Yes it need to change because in ac supply we need to change the frequency of current so ac to ac converter needed.The name of AC to AC converter is Regulator


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