Changing 500 V Motors Into 400 V

[Ahmar]

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.

 

 

[marke]

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,

Mark.