Electric Motor RPM Calculation:
RPM=120*Hz/P
Hz: Hertz(50Hz or 60Hz) P: Pole( Usually 2,4,6,8)
Note: The mostly used pole is 4,6.
(1) When the pole is 4, Hz=50 RPM=120*50/4=1500
(2) When the pole is 4, Hz=60 RPM=120*60/4=1800
(3) When the pole is 6, Hz=50 RPM=120*50/6=1000
(4) When the pole is 6, Hz=60 RPM=120*60/6=1200
Note: We also can use gear reducer to change the motor RPM.
Technical Data