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Changing 500 V Motors Into 400 V

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#1 Ahmar


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Posted 23 September 2008 - 07:22 AM

For one of our projects supplier has supplied 500 V squirrel cage induction motors but our system voltage is 400 V ac. How can we convert these 500 V motors into 400 V? can it be done by rewinding? if so what changes in the winding need to be made.

#2 marke


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Posted 23 September 2008 - 08:12 AM

Hello Ahmar

You can change the voltage by rewinding. Reduce the number of turns by the voltage ratio. To reduce the voltage by 10%, reduce the number of turns by 10%.
You also need to increase the wire size as the current at the reduced voltage will be higher.

Best regards,

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