What is purpose of capacitor bank in ac drive?

Is capacitor bank in ac drive use to save energy or power by improving power factor? or it is use to maintain dc constant to inverter stage or for other purpose.

you usually have 2. one is a start cap which sends a burst of power to the motor when starting. its usually controlled by a current relay that opens and disengages the start cap once the motor is running. usually opens in 2 sec or less.
the other cap or run capacitor keeps run voltage constant and clean
cap are used on single phase motors. 3 phase dose not need them

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One Response to “What is purpose of capacitor bank in ac drive?”

nassin00 on November 29th, 2009 at 10:32 am

you usually have 2. one is a start cap which sends a burst of power to the motor when starting. its usually controlled by a current relay that opens and disengages the start cap once the motor is running. usually opens in 2 sec or less.
the other cap or run capacitor keeps run voltage constant and clean
cap are used on single phase motors. 3 phase dose not need them
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