12 Difference Between 2-Pole Motor and 4-Pole Motor

A motor is an electric device that changes electrical energy into mechanical energy (torque). The most common kind of electric motor has two or four poles.

Michael Faraday’s theory of electromagnetic induction is used to explain how both motors work.

The number of electromagnets is the main difference between 2 pole and 4 pole motors.

A motor with two poles has two electromagnets, while a motor with four poles has four electromagnets.

What is a 2 Pole Motor?

A motor with two poles is called a 2-pole motor (or a single set of magnetic poles, north and south). The north and south poles are often made out of the windings on the stator.

The number of stator coils can be any number between 2 and 12 that makes sense. There are motors with more than 12 poles, but they are rarely used.

As the expression below shows, the number of poles is directly related to the synchronous speeds of the motors.

2-Pole Motor vs 4-Pole Motor

Synchronous speed of the motor = (120×frequency)/(number of poles)

So, the synchronous speed of a two-pole motor that is connected to the mains is 3000 RPM. Slip and load can cause operating speeds with the rated load to drop to around 2900 RPM.

In a two-pole motor, the rotor turns 1800 times every half cycle. So, every time the source goes around, the rotor goes around once. Both the amount of energy used and the amount of torque made by a two-pole motor are pretty small.

What You Need To Know About 2 Pole Motor

  1. A motor with two magnetic poles, or a pair of magnetic poles, is called a two-pole motor.
  2. Every time the source goes around, the rotor of the two-pole motor goes around once.
  3. A two-pole motor is set up from north to south.
  4. A two-pole motor has a high speed because it only has two poles.
  5. Less work is done by a two-pole motor than by a four-pole motor.
  6. A motor with two poles doesn’t make much noise.
  7. A two-pole motor looks like a tube.
  8. More turns per minute are made by a motor with two poles.
  9. A two-pole motor always needs a gearbox with a speed below 3000 rpm.
  10. A two-pole motor has a higher NPSHR.
  11. A two-pole motor isn’t built to handle a lot of power.
  12. A two-pole motor is more efficient than a one-pole motor.

What is a 4 Pole Motor?

A four-pole motor has four magnetic poles, or two pairs of poles that are arranged north-south-north-south. A four-pole motor needs more energy to run, has fewer turns per minute, and makes more torque and work per horsepower. This motor is good for jobs that need a lot of power.

A motor with four alternating poles in the stator, or two pairs of poles: N > S > N > S. The synchronous speed of a four-pole motor that is plugged into the mains is 1500 RPM, which is half the speed of a two-pole motor. With the rated load, the operating speed can go down to about 1,450 RPM.

Every half cycle, the rotor of a four-pole motor turns 900 times. So, every two cycles of the source, the rotor goes through one full cycle. Because of this, it uses twice as much energy as a two-pole motor and, in theory, gives twice as much torque.

What You Need To Know About 4 Pole Motor

  1. A four-pole motor has four magnets, or two sets of two magnets.
  2. Every time the source goes around, the four-pole motor only goes around halfway.
  3. A four-pole motor is set up from north to south to north to south to north.
  4. A four-pole motor moves slowly because it has more poles than a two-pole motor.
  5. A two-pole motor can do half as much work as a four-pole motor.
  6. A four-pole motor does not produce much noise.
  7. The motor with four poles is not round.
  8. A four-pole motor produces fewer revolutions per minute.
  9. In general, a four-pole motor does not need a gearbox.
  10. The four-pole motor has a low NPSHR.
  11. High power needs a motor with four poles.
  12. A four-pole motor doesn’t work well.

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

BASIS OF COMPARISON2 POLE MOTOR4 POLE MOTOR
Description2 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 ResourceRotor 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.
ConfigurationA 2 pole motor shows a north-south configuration.A 4 pole motor shows north-south-north-south configuration.
Speed2 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 Output2 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 Performance2 pole motor has a good noise performance.A 4 pole motor does not have a good noise performance.
ShapeA 2 pole motor is cylindrical in shape.The 4 pole motor is not cylindrical.
RPMA 2 pole motor has more revolution per minute.A 4 pole motor has less revolution per minute.
GearboxGearbox below 3000rpm is always required for a 2 pole motor.Generally, there is no need for gearbox in a 4 pole motor.
NPSHRA 2 pole motor has higher NPSHR.The 4 pole motor has low NPSHR.
SuitabilityA 2 pole motor is not suitable for heavy power.4 pole motor is suitable for heavy power.
Efficiency2 pole motor is more efficient.A 4 pole motor is less efficient.

1 Pole vs. 2 Pole

In our homes, there are two different kinds of breakers. One has a single pole, and the other has two. When we compare one pole to two poles, we find that they are very different from each other.

In a 120-volt circuit, a 1-pole breaker is used, which has one hot wire and one single wire. The 240-volt circuit has two hot wires and a two-pole breaker to keep them from getting too hot.

2 Pole Motor vs. 4 Pole Motor Pros and cons

2 Pole Motor Pros and Cons

Pros of 2 Pole Motor

  • A two-pole motor is more efficient and moves twice as fast as a four-pole motor.
  • The two-pole motor makes less noise and turns faster than the one-pole motor.

Cons of 2 Pole Motor

  • A two-pole motor can’t handle a lot of power, so it can’t be used in bigger devices or for bigger tasks.
  • If you want to use a two-pole motor, you need a gearbox. since it can’t work without the gearbox.

2-Pole Motor vs 4-Pole Motor

4 Pole Motor Pros and Cons

Pros of 4 Pole Motor

  • A motor with four poles can provide enough power. And it can also be used for big projects.
  • Some motors need a gearbox to work, but the four-pole motor can work without one.

Cons of 4 Pole Motor

  • The higher the pole, the slower the motor moves.Because of this, a motor with four poles moves slower than a motor with two poles.
  • This motor doesn’t work as well and uses more energy.

FAQs

Which Is Better, 2 Pole or 4 Pole Motor?

People say that a two-pole motor is better because it works better and moves faster than motors with more poles.

Are More Poles on a Motor Better?

It’s not always better because more poles slow down the motor and make it use more energy, which could cause power loss.

Why Does A 2 Pole Motor Spin Faster Than A 4 Pole Motor?

Because the space between the two poles in a two-pole motor is 180 degrees, the rotor turns once. With a 4 pole motor, there isn’t much room to do that, so the rotor moves at half the speed of a 2 pole motor.

How Much RPM Is a 4 Pole Motor?

A motor with four poles can only turn at 1,800 RPM.

How Do You Change the Number of Poles?

By changing how the coil is connected, it is easy to change the number of poles.

2-Pole Motor vs 4-Pole Motor

Conclusion

An electric motor is a machine that changes the energy from electricity into mechanical energy.

There are different kinds of these motors based on how they get their power, what they are used for, how much motion they make, how they are built inside, and how many poles they have.

Two- and four-pole motors are among the most common kinds. The main difference between these motors is the number of poles. There are only two poles on the two-pole motor.

A motor with four poles has four poles. If you compare a 2-pole motor to a 4-pole motor, the 2-pole motor is more efficient and moves faster.

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