Capacitor motor starting
Posted 25 December 2004 - 07:54 AM
Were doing a motor start study at work and one method that has been mentioned is using capacitors. I've never come across this method of starting motors before. No other start method will be used just cpacitors, any ideas or suggestions on how this will work much appreciated.
It will be used mainly at MV.
Best regards and a happy christmas
Posted 05 January 2005 - 01:04 AM
Posted 06 January 2005 - 04:44 AM
Capacitive starting is commonly used for single phase motors. The single phase motor needs to have a second phase to start, see our page on single phase motors, and the capacitor is used to create a phasehift to drive the start winding.
It is not commonly used with three phase motors, however, at zero speed, the induction motor has a very low power factor. If there is capacitance added, the power factor can be improved and the start current reduced. The difficulty is that as the motor accelerates, the power factor improves, reducing the amount of correction required. To do this effectively, requires many steps, and these need to be synchronsed to the motor speed. - not an ideal situation.
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Posted 08 January 2005 - 12:13 AM
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