What is meant by Poles in induction motor?

The motor drive energizes stator teeth one after the other to make the rotor turn, thanks to its magnets’ tendency to force alignment with the stator teeth. Simply defined, a pole is a north or south magnetic field of force that is generated by a permanent magnet or current passing through a coil of wire.

What is a pole in motor?

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 12 pole motor, there are 6 north poles and 6 south poles. This motor would also be considered a 6 pole-pair motor.

What is 2 pole and 4 pole motor?

2 pole motor has two poles (or a single pair of magnetic poles) while 4 pole motors have four magnetic poles in alternating order.

How pole is created in induction motor?

If electric current is passed through two coils on opposite sides of the stator, we have an electromagnet. This sets up a magnetic field like that of a horseshoe magnet. This field passes through the rotor. Thus each winding has two magnetic poles, thus the motor is known as a two pole motor.

What is pole in 3 phase induction?

For a 3-phase motor, if you count a total of 12 coil groups, it has 4 magnetic poles. For a 12-pole 3-phase machine, there will be 36 coils. The number of magnetic poles in the rotor is equal to the number of magnetic poles in the stator.

Which is better 4 pole or 6 pole motor?

Using this equation, a 4-pole motor at 60Hz has a speed of 1,800 rpm, while a 6-pole motor at 50Hz has a speed of 1,000 rpm. However, this is actually the speed of the magnetic field, called the synchronous speed, which is not always equal to the shaft speed.

How is motor pole calculated?

The formula is n = 60 x f /p where n = synchronous speed; f = supply frequency & p = pairs of poles per phase. The actual running speed is the synchronous speed minus the slip speed.

How are motor pole poles measured?

To determine the number of poles, you can read the data plate directly or calculate it from the RPM stated on the data plate or you can count the coils and divide by 3 (poles per phase) or by 6 (pairs of poles per phase).

What is define of poles?

1 : either extremity of an axis of a sphere and especially of the earth’s axis. 2a : either of two related opposites. b : a point of guidance or attraction. 3a : either of the two terminals of an electric cell, battery, generator, or motor.

How can we identify the Poles in induction motors?

To determine the number of poles, you can read the data plate directly or calculate it from the RPM stated on the data plate or you can count the coils and divide by 3 (poles per phase) or by 6 (pairs of poles per phase). Where the power of the induction motor is constant, the torque increases at the rate that the speed decreases.

How many Poles are in a 3-phase induction motor?

A two-pole, three phase motor actually has 6 poles or 3 sets of poles at 120 degrees apart. This creates a rotating field at the same frequency as the AC power.

What are the different types of induction motors?

There are basically two types of induction motor that depend upon the input supply – single phase induction motor and three phase induction motor. Single phase induction motor is not a self starting motor which we will discuss later and three phase induction motoris a self-starting motor. Types Induction Motor. Split phase induction motor.

What is the working principle of induction motor?

Working Principle of an Induction Motor. The motor which works on the principle of electromagnetic induction is known as the induction motor. The electromagnetic induction is the phenomenon in which the electromotive force induces across the electrical conductor when it is placed in a rotating magnetic field.