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## What are number of poles 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’s the difference between 4 pole and 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. … In a synchronous motor, the rotor uses a permanent magnet or electromagnet to rotate at the calculated speed. On the other hand, an induction motor will operate slightly below the calculated rpm.

## What happens if 60Hz motor is driven at 50Hz?

It will run with following problems for a 50Hz motor running on 60Hz: **The core loss will increase and cause over heating of core**. As the core loss will increase, the Power Factor of motor will reduce. The motor speed will be higher, so shaft load will increase.

## 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 many coils does a 6 pole motor have?

To create a six pole motor use **six coils per phase** that creates three north poles and three south poles and so on. The number of stator slots is always a multiple of six.

## 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.