what is a 4 pole motor

What Is A 4 Pole Motor? [Explained]


Proper knowledge about technical stuff can be very hard to find. Especially about motors, speed, frequency, and many more. But don’t worry we got your back.

So, what is a 4 pole motor?

A 4 pole motor is a machine that turns electrical energy into mechanical energy. Each part of a 4 pole motor works to keep it rotating. There are magnetic poles, ventilation, gearbox, and many more. We need to understand the RPM, speed, and other configurations to know how it operates. 

The above information cannot be enough for you. We invite you to read the entire article if you have the time.

Let’s not spend any more time and go right to the point.

What Is An Electric Brushless 4 Pole Motor?

Now, before anything, let’s start with the basics of an electric brushless motor. This discussion might help you in knowing whether the brushless motor is working properly or not

A brushless electric motor is a machine that transforms electrical energy into mechanical energy. The motor usually does that by employing electromagnetic phenomena. 

Moreover, to generate force within the motor. The interaction of a magnetic field and alternating current or direct current occurs.  

So, if you want to buy motors, here are some recommendations-

Product 1
Product 2

These are the best electric brushless motors available. 

How Does a 4 Pole Motor Operate? 

It’s not a complicated machine. But some of us might be weak in physics. So, we are afraid to understand these basics. Don’t worry, we always fear what we don’t understand. 

Therefore, to alleviate this, we will explain it easily. This will make you understand better. Now, let’s see how a 4 pole motor operates-

Magnetic Poles

The way a 4 pole motor operates is simple but sophisticated. A 4 pole motor has 4 magnetic poles or 2 pairs of magnetic poles.

A motor has various parts in order to continuously rotate. Poles are among those parts. These poles are magnetic poles, on the rotor.


RPM stands for revolutions per minute. It’s basically how many times the motor revolution per minute. The 4 pole motor produces fewer revolutions per minute than 2 pole motors.

Now if a 4 pole gets 60 Hz change polarity it will spin at 1800 rpm. Furthermore, a 60 Hz supply change polarity means 60 times per second. Whereas for a 50 Hz, it will spin at 1500 rpm. 

Because a 60Hz power supply changes polarity 20% faster than a 50Hz power supply. Then, a 50Hz motor will spin at a 20% higher rpm. The torque of the motor is normally constant. And increased speed results in increased shaft power. 

It is more difficult to connect a 60Hz motor to a 50Hz power supply. At the same voltage, the reduced speed can saturate the motor’s magnetic core. That will increase current and overheat the unit. 

Speed of The Motor

A 4 motor has a slow speed. Because it has more poles than 2 pole motors. More poles make it slower but it can take a heavy load. 

The magnetic field speed in 4 pole motors is synchronous speed. The synchronous speed does not correspond to the shaft speed.

In every synchronous motor, the rotor rotates at a calculated speed. The rotor uses an electromagnet or permanent magnet to do so. 

An induction motor will operate at a slightly lower rpm than estimated. This is how electromagnetic induction works, and it is not a defect.

If the nameplate speed of an electric motor is 1,800 revolutions per minute. Then it’s most probably a 4-pole synchronous motor with a 60 Hz frequency rating. If, on the other hand, the nameplate speed is less than 1,760 rpm. The unit is then an induction motor.

Configuration and Shape 

The configuration of a 4 pole motor is north-south-north-south. The noise performance of the 4 pole motor is inadequate. Because It’s not a cylindrical motor.

Number Of Cycle

A 4 motor produces twice as much work as a 2 engine. In every cycle of the source, the 4 pole motor only completes half a cycle.

Every motor we see has a number of cycles except roller cars.

Ventilation of The Motor

The motor generates additional heat, but the cooling fan accelerates along with the shaft. That assists in the removal of the excess heat. The motor also draws more reactive current, lowering its power factor.

If you want to buy 4 pole motors we have some suggestions-

Product 1
Product 2

These are some good quality 4 pole motors available in the market. 


There is no need for a gearbox or servo saver in 4 pole motors. Even without these, it is designed for high power performance.

So, this is how a 4 pole motor operates. 


Question: What exactly does a 4 pole switch imply?

Answer: Lighting can be controlled from three or more locations using four-way switches. Four-way switches work in conjunction with three-way switches. A four-way switch has four terminals that give two sets of toggle settings.

Question: Which motor is better, a two-pole or a four-pole?

Answer: If the flow rate is low less than 4L/S. And the pressure is quite high greater than 150 kPa. Then a two-pole motor-driven pump will almost certainly outperform a four-pole pump. This is correct in terms of performance and efficiency.

Question: How does a shaded pole motor begin to run?

Answer:  A shaded pole induction motor is a basic single-phase induction motor. That self-starts by shading one of the poles with a copper ring. A copper ring is also referred to as a shaded ring. Because it functions as a secondary winding motor.


Here we go now you know what is a 4 pole motor. We hope you were able to find everything you were looking for. So, you’ll be able to work properly with a 4 pole motor. 

Good Luck!

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