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kamalg
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Join Date: Mar 2009
Posts: 10

Voltage Flactuations for AC 3Phase Motor

06/15/2009 11:47 AM

We have a 380V,3phase,3w motor to be connected to a 400V, 3Phase,3W power. Is it OK to perform at this voltage (5% voltage drop) constantly? How can we determine what % of voltage drip would be fine for the motor to run good. How can we boost voltage in-expensive way? The motor would be started by contactor.
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PWSlack
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#1

Re: Voltage Flactuations for AC 3Phase Motor

06/15/2009 11:52 AM

There is no need to do anything to the supply or the motor, other than to make sure the overload device is correctly set.

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danman285
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#7
In reply to #1

Re: Voltage Flactuations for AC 3Phase Motor

06/16/2009 9:35 AM

How much of a difference can most induction motors tolerate before there are adverse effects?
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PWSlack
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#8
In reply to #7

Re: Voltage Flactuations for AC 3Phase Motor

06/25/2009 11:38 AM

The tolerance on most delivered voltages is +/- 10%.

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lyn
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#2

Re: Voltage Flactuations for AC 3Phase Motor

06/15/2009 6:57 PM

I agree with PWSlack.

He knows his stuff!
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PWSlack
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#5
In reply to #2

Re: Voltage Flactuations for AC 3Phase Motor

06/16/2009 3:12 AM

<...He knows his stuff!...>

Or she might know her stuff. It's so difficult to tell......

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Qqberci
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#3

Re: Voltage Flactuations for AC 3Phase Motor

06/16/2009 12:34 AM

There is nothing to do, the motor can tolerate much bigger differences.

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Anonymous Poster
#4

Re: Voltage Flactuations for AC 3Phase Motor

06/16/2009 1:44 AM

Voltages on the motor allow for fluctuations within your stated ranges.

You're good to go... But make certain you have over-load protection going into the device and out of the device (if you're running it to a regulated switch or circuit board).

JL Mealer
Mealer Companies LLC
America's Next Major Automaker
http://mealercompanies.com
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shayre
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#6

Re: Voltage Flactuations for AC 3Phase Motor

06/16/2009 7:41 AM

No voltage dip here, rather voltage gain
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Anonymous Poster (1); danman285 (1); lyn (1); PWSlack (3); Qqberci (1); shayre (1)

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