# Quick Answer: Which Is Better 2 Pole Or 4 Pole Motor?

## What does 4 Pole mean in electrical terms?

It basically means that an electrical machine (motor or generator) has four magnetic poles as shown in this cross section: [1] There are four magnetic poles on the rotor (the inner part that turns with the shaft): two north poles and two south poles..

## How can we increase the RPM of motor?

Increasing the speed can be achieved by increasing the supply frequency as the speed and frequency are directly proportional; however, there are two constraints. The first is the saturation of the magnetic circuit, but this issue can be significantly avoided by keeping the V/f ratio constant.

## What does 2 pole motor mean?

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 is the rpm of 1 hp motor?

3600 RPMThe 3600 RPM, 1HP motor produces 1.5 ft. lbs. of torque at 3600 RPM.

## What is pole in motor?

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. … Permanent-magnet stepper motors are the simplest. Manufacturers define their pole count by the number of pole pairs or stator windings.

## What is a 3 pole motor?

The magnetic fields in a three pole DC motor are generated by three electromagnets and two permanent magnets, as shown on the right. A section of the motor, called the commutator, connects the brushes to the coils and allows for current to flow from the power source, through the coils and back to the power source.

## What is the difference between 2 pole and 4 pole generator?

4-pole synchronous motors and generators have solid rotors with salient poles while 4-pole induction motors and generators have squirrel cage rotors. In 2-pole motors and generators the rotors are cylindrical. … Critical speed 4-pole motors and generators always run below their first lat- eral critical speed.

## What is the difference between a 4 pole and 6 pole motor?

On an induction motor, the number of poles determines the speed given the frequency of the power. … For a 4 pole motor, the speed is halved – 1800 rpm, 6 pole, 1200 rpm and so on. As speed decreases, torque increases so an 8 pole motor has 4x the torque of a 2 pole motor (but 1/4 the speed).

## What is a pole in a generator?

2 pole generators turn mechanical energy from turbines into alternating current electrical energy used by utilities and industries. 2-pole generators have a rotor that works like an electromagnet, with one north and one south pole. … The stator coil is then connected to the generator terminals.

## What RPM does a 4 pole rotor turn to produce 60hz?

1,800 rpmSimilarly, for a 4-pole generator, an engine speed of 1,800 rpm produces output of 60 Hz.

## What is 120 in motor speed formula?

For example, for a 6-pole, 50 Hz, 3-phase induction motor, Ns = 120 * 50/6 = 1000 rpm. It means that the flux rotates around the stator at a speed of 1000 rpm.

## How do you check a motor pole?

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 does 3 pole breaker mean?

Used most often in a three-phase electrical system, a three-pole breaker connects three different conductors, such as is often required by heavy duty industrial motors. When a surge exists anywhere in the system, across one or more of the conductors, the breaker trips, the power bridge collapses, and the circuit opens.

## Is 3 pole the same as 3 phase?

Larger facilities may have 3 phase power but the pole explanation is nearly the same. Phases are derived from transformer configurations, single phase having 1 coil and 3 phase have 3 coils.

## What is the rpm of a 4 pole motor?

around 1800 rpmTwo pole AC motors operating at 60 Hz will always run at approximately 3600 rpm, and four pole AC motors will have speeds around 1800 rpm.

## What is an 8 pole motor?

An 8 poles machines’ synchronous speed is 750 RPM. As the number of poles is increased, the magnetizing current of the motor increases and the motor can deliver the higher starting as well as the running torque. … The lower speed motor is suitable for driving the high inertial loads like cranes, elevator, etc.

## What is a 4 pole breaker used for?

We can use 4-pole breakers or TPN Breakers when the system has two alternative sources and, in the event of power failure from the mains, change-over to the standby generator is done. In such a case, it is a good practice to isolate the neutral also.

## What is the rpm of a 2 pole motor?

3,600 rpmA two-pole motor operates at 3,600 rpm (7,200 rpm Ã· 2) unloaded, and approximately 3,450 under load. Two-pole motors often are found in pump applications, such as sump pumps, swimming pool pumps, and water recirculating equipment.