# 4 Pole Induction Motor Working Principle

• BlackMelon
In summary, the conversation discusses the working principle of an induction motor, specifically regarding the number of poles and how it affects the torque and RPM of the motor. The attachment provided is a portion from Stephen J. Chapman's textbook which explains the theory of the rotating magnetic field for a 2-pole induction motor. However, the author does not provide the same proof for a 4-pole motor. The question posed is how this configuration forms a rotating magnetic field and makes the rotor rotate. In response, it is explained that the underlying physics of the motor remains the same, with the only difference being the torque and RPM characteristics. Motors with more poles have a smaller distance between each coil, resulting in a longer distance dragged by each cycle
BlackMelon
Hello,

I am studying the working principle of an induction motor. The attachment below (link) is a portion from Stephen J. Chapman's textbook (page 160-169). He proved the theory of the rotating magnetic field so well for a 2-pole induction motor from 160 to 164. However, on page 166, the author proposed a 4-pole motor but did not provide the similar proof. I would like to know how this configuration forms a rotating magnetic field and makes the rotor (squirrel cage) rotate. Do you guys have any good papers for this?

https://www.mediafire.com/file/86a7...-2bh471C15I5A5Gi_YZx77Vy9g6jgxUTzcZuZAwiHQijI

Thank You
BlackMelon

Last edited:
@BlackMelon the number of poles is just that aka the number of poles, the underlying physics of how the motor works doesn't change. The only thing that changes is the torque and RPM characteristic of the motor but the physics is the same, you still have a current that changes with time and drags the rotor along, only with more poles each set of coils drags the rotor a smaller distance.

Having less coil pairs/pole pairs means that each coil is located more degrees apart and each cycle drags the rotor for a longer distance.
This is why for a given fixed frequency fast RPM motors usually have less poles , as a consequence they also have less torque

## 1. What is a 4 Pole Induction Motor?

A 4 Pole Induction Motor is a type of electric motor that operates on the principle of electromagnetic induction. It is a type of AC motor that has four poles, or sets of windings, in its stator (stationary part) and a rotor (rotating part) that is made of conductive bars. It is commonly used in industrial and commercial applications due to its efficiency and reliability.

## 2. How does a 4 Pole Induction Motor work?

A 4 Pole Induction Motor works by creating a rotating magnetic field in the stator through the use of alternating current. This rotating magnetic field induces currents in the rotor, which in turn creates its own magnetic field. The interaction between the two magnetic fields causes the rotor to rotate, thus producing mechanical energy.

## 3. What are the advantages of a 4 Pole Induction Motor?

There are several advantages to using a 4 Pole Induction Motor, including high efficiency, low maintenance, and robust construction. They also have a simple design and are relatively inexpensive to produce. Additionally, they can operate in a wide range of speeds and can handle heavy loads without overheating.

## 4. What are the applications of a 4 Pole Induction Motor?

4 Pole Induction Motors are commonly used in various industrial and commercial applications, such as pumps, fans, compressors, and conveyors. They are also used in household appliances like washing machines, refrigerators, and air conditioners. In addition, they are used in electric vehicles and renewable energy systems.

## 5. How do you maintain a 4 Pole Induction Motor?

Maintenance of a 4 Pole Induction Motor typically involves regular cleaning, lubrication, and inspection of its components. It is important to check for any signs of wear and tear, such as damaged windings or bearings, and replace them as needed. It is also important to ensure that the motor is properly aligned and that there is no excessive vibration during operation. Regular maintenance can help prolong the lifespan of the motor and prevent unexpected breakdowns.

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