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Switching Frequency


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#1 chaterpilar

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Posted 16 December 2007 - 01:51 PM

Will increasing the switching frequency of a variable speed drive have any effect on the current drawn by the motor..?

Any thoughts..?

#2 marke

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Posted 16 December 2007 - 05:48 PM

Hello chaterpilar

No, changing the switching speed should not significantly affect the current drawn by the motor. It will however, increase the switching losses in the drive.
There will be an increase in the capacitive current into the motor as at each switching transition, current flows to chare up the capacitance of the motor, but this is small compared to the steady state current into the motor.

Best regards,

#3 chaterpilar

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Posted 17 December 2007 - 03:22 AM

Thanks Marke for your reply.




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