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gajendramishra
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Join Date: Jul 2010
Location: bilara,jodhpr,rajasthan
Posts: 2

Frequency - Increase-Decrease

10/15/2010 3:43 AM

What happen when 10 hp 1440 rpm 3phase 50 Hz rated motor use with40hz power other mean what effect on induction moter,s speed,amp.&load capacity from increase-decrese of frequency
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nascon
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India - Member - PROFESSIONAL Engineering Fields - Power Engineering - electrical planning - designing

Join Date: Sep 2007
Location: Ahmedbad, Gujarat
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#1

Re: frequency

10/15/2010 4:17 AM

Frequency has direct impact on RPM - N = 120f/p where f is frequency and p number of poles n here 1500 sync speed means 4 pole hence change due lower frequency shall have sync speed as 1200 RMP

Accordingly speed - torque curve will change

nascon
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#2
In reply to #1

Re: frequency

10/19/2010 5:06 AM

<...Accordingly speed - torque curve will change...>

It would be better to state that the motor will be operating on a different characterisic curve because of the changed frequency.

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