Which
of the following is preferred rpm for 4 pole induction motor?
1485 rpm
1470
rpm
1440 rpm
1320
rpm
1485 rpm
Given
:Number of poles (P) = 4
Let,
frequency (f ) = 50 Hz
Now, for an induction motor the synchronous speed in rpm is given by,
For
having minimum slip, the running speed must be close to 1500 rpm, which is 1485
rpm from the given options.
Hence,
the correct option is (A).
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