Electrical Machines Alternator and Synchronous Motors Synchronous Motor Starting

If the speed of a synchronous motor is 160 rpm, then the number of poles (P) and supply frequency (f) values are

1

P = 20 and f = 50 Hz

2

P = 30 and f = 40 Hz

3

P = 40 and f = 50 Hz

4

P = 60 and f = 40 Hz

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