Answer Posted / saa

RPM of Prime mover is related with Electrical frequency.

Some countries use 50 HZ with 1500 Rpm for 4 pole
Some countries use 60 Hz with 1800 Rpm for 4 pole

for 55 Hz 4 pole RPM of Prime mover will be 1650



Some countries use 50 HZ with 1000 Rpm for 6 pole
Some countries use 60 Hz with 1200 Rpm for 6 pole

for 55 Hz 6 pole RPM of Prime mover will be 1100


Itz just matter of Choice.

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