Single vs. 3 phase

#16

08-17-2005, 01:20 PM

Jim H

Geezer

Join Date: Aug 2000

Location: Holland, MI

Posts: 1,316

Quote:

Originally Posted by tkamiya

If you have a very large motor under heavy load, you will connect your motor winding in DELTA so you get more current per winding for more torque. Then once started, you'd immediately reconfigure it to Y for better effeciency. There is a very special transfer switch called STAR-DELTA to do this.

The star-delta (reduced-voltage) starter I am familiar with starts the motor in star configuration to reduce the voltage applied across each winding, reducing the current drawn (and torque available per phase) and switches to delta configuration for running, applying full voltage across each winding to produce full running torque.

Best Regards,
Jim

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