Relationship Between Motor Poles Number with Speed

Display problem ? Click HERE

The following formula relates speed of the electric motor to number poles :

S = k x Hz x 60 / Number of Poles

where:

• S = Motor speed
  
• k = 2 for alternating current (AC electricity)
• Hz = 60 for 60-Hertz electricity i.e. electricity moves (oscillates) at 60-waves per second
• "Poles" are the positive and negative electromagnetic fields in the motor

Standard electric motor speeds at 60-Hz electricity.

• 2-pole motor = 3,600 RPM
• 4-pole motor = 1,800 RPM
• 6-pole motor = 1,200 RPM
• 8-pole motor = 900 RPM

Standard electric motor speeds at 50-Hz electricity.

• 2-pole motor = 3,000 RPM
• 4-pole motor = 1,500 RPM
• 6-pole motor = 1,000 RPM
• 8-pole motor = 750 RPM