Difference Between 4 Pole And 6 Pole Motors

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Motor Pole Count

A permanent magnet has two poles, but motors can be wired so their magnetic field has a higher number of poles. The pole count of a motor is the number of permanent magnetic poles, north and south, on the rotor. There is always the same number of north and south poles on the rotor. For example, in a 6 pole motor, there are 3 north poles and 3 south poles. This motor would also be considered a 3 pole-pair motor.

Benefits of Motor Pole Count

Benefits to having a high pole count motor include:

  • Maximized inner diameter (ID) to outer diameter (OD) ratio
  • Reduced weight
  • Higher frequency cogging torque (related to slotted motors)
  • Higher motor efficiency

Disadvantages of High Motor Pole Count

Disadvantages to having a high pole count motor include:

  • Higher eddy current losses
  • Increased frequency-dependent hysteresis losses
  • Higher servo drive current loop bandwidth
  • Reduced maximum speed

Also Read: Difference Between 2 Pole And 4 Pole Motor

4 Pole vs 6 Pole

A 4 pole motor has four magnetic poles with a north-south configuration. It gives a high speed because of the fewer poles. It delivers a high rpm and low torque when compared to a 6 pole motor.

A 6 pole motor uses six magnetic poles with a north-south-north-south configuration. It gives less speed because of the high pole number. 6 pole motors generate high torque and low rpm when compared to both 4 pole and 2 pole motors.

Basis of Factors4 pole motor6 pole motor
ConfigurationHas 4 magnets with north-south configurationHas 6 magnets with north-south-north-south configuration
SpeedHighLow
EfficiencyMoreLess
Work outputLess work output, not suitable for heavy-dutyMore work output, best for heavy-duty
Vibration and NoiseProduces relatively much noiseProduces Relatively less noise
Servicing and maintenanceHigh maintenance Easy Maintenance
PriceBudget-FriendlyCostly

Also Read: Difference Between Bar magnet And Solenoid