12 Difference Between 2 Pole Motors And 4 pole Motors

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An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor’s magnetic field and electric current in a wire winding to generate force in the form of rotation of a shaft.  Electric motors may be classified by considerations such as power source type, internal construction, application and type of motion output.

The number of poles is the factor that determines the synchronous speed of an induction motor. A 4-pole motor is within 4 magnetic poles on the rotor and the number of related electro-magnetic windings (circuits).

A 4-pole motor has about 3.0 ft-lbs of torque per horsepower whereas a 2 pole motor has 1.5 ft-lbs of torque. At 60Hz, a 4-pole motor is about 1800 rpm where a 2-pole motor is 3600 rpm. Thus, the 4-pole motor provides higher-efficiency, higher torque per unit of volume and weight.

2 Pole Motors

A 2 pole motor is a type of motor that has two magnetic poles or a pair of magnetic pole, with a north-south configuration. A 2 pole motor consumes less energy, has more revolutions per minute, good noise performance and less work output. This type of motor is not efficient for heavy power applications.

What You Need To Know About 2 Pole Motor

  1. 2 pole motor is a type of motor that has two magnetic poles or a pair of magnetic pole.
  2. Rotor of the 2 pole motor completes one cycle for every cycle of the source.
  3. A 2 pole motor shows a north-south configuration.
  4. 2 pole motor has high speed due to less number of poles.
  5. 2 pole motor has less workout when compared to a 4 pole motor.
  6. 2 pole motor has a good noise performance.
  7. A 2 pole motor is cylindrical in shape.
  8. A 2 pole motor has more revolution per minute.
  9. Gearbox below 3000rpm is always required for a 2 pole motor.
  10. A 2 pole motor has higher NPSHR.
  11. A 2 pole motor is not suitable for heavy power.
  12. 2 pole motor is more efficient.

4 Pole Motors

4 pole motor is a type of motor with 4 magnetic poles or two pairs of magnetic poles, with a north-south-north-south configuration. A 4 pole motor consumes more energy, has fewer revolutions per minute, and delivers more torque per horsepower and work output. This type of motor  is suitable for heavy power applications.

What You Need To Know About 4 Pole Motor  

  1. 4 pole motor is a type of motor with 4 magnetic poles or two pairs of magnetic poles.
  2. 4 pole motor completes only half a cycle for every single cycle of the source.
  3. A 4 pole motor shows north-south-north-south configuration.
  4. A 4 pole motor has low speed due to more number of poles.
  5. 4 pole motor has double work output than a 2-pole motor.
  6. A 4 pole motor does not have a good noise performance.
  7. The 4 pole motor is not cylindrical.
  8. A 4 pole motor has less revolution per minute.
  9. Generally, there is no need for gearbox in a 4 pole motor.
  10. The 4 pole motor has low NPSHR.
  11. 4 pole motor is suitable for heavy power.
  12. A 4 pole motor is less efficient.

Also Read: Difference Between Stepper Motor And Servo Motor

Difference Between 2 Pole Motors And 4 Pole Motors In Tabular Form

BASIS OF COMPARISON 2 POLE MOTOR 4 POLE MOTOR
Description 2 pole motor is a type of motor that has two magnetic poles or a pair of magnetic pole.   4 pole motor is a type of motor with 4 magnetic poles or two pairs of magnetic poles.  
Number Of Cycle For Every Cycle Of The Resource Rotor of the 2 pole motor completes one cycle for every cycle of the source.   4 pole motor completes only half a cycle for every single cycle of the source.  
Configuration A 2 pole motor shows a north-south configuration.   A 4 pole motor shows north-south-north-south configuration.  
Speed 2 pole motor has high speed due to less number of poles.   A 4 pole motor has low speed due to more number of poles.  
Work Output 2 pole motor has less workout when compared to a 4 pole motor.   4 pole motor has double work output than a 2-pole motor.  
Noise Performance 2 pole motor has a good noise performance.   A 4 pole motor does not have a good noise performance.  
Shape A 2 pole motor is cylindrical in shape.   The 4 pole motor is not cylindrical.  
RPM A 2 pole motor has more revolution per minute.   A 4 pole motor has less revolution per minute.  
Gearbox Gearbox below 3000rpm is always required for a 2 pole motor.   Generally, there is no need for gearbox in a 4 pole motor.  
NPSHR A 2 pole motor has higher NPSHR.   The 4 pole motor has low NPSHR.  
Suitability A 2 pole motor is not suitable for heavy power.   4 pole motor is suitable for heavy power.  
Efficiency 2 pole motor is more efficient.   A 4 pole motor is less efficient.  

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