To satisfy consumers’ desires for quieter motors, manufacturers have developed eight-pole motors. These operate at 900 rpm (unloaded) and approximately 800 rpm under load. They are being used in applications where customers expect quieter operation, such as room air conditioners and outdoor heat pump applications.

## What RPM is an 8 pole motor?

Approximate Electrical Motor Speed (rpm) | ||
---|---|---|

No. Poles | Speed with Rated Load | Synchronous Speed (no Load) |

4 | 1725 | 1800 |

6 | 1140 | 1200 |

8 | 850 | 900 |

## What is the rpm of a motor that has 8 poles and operates on 60Hz?

At 60 Hz, a motor with six poles would run at 1,200 RPM under no load and at approximately 1,175 RPM loaded. A motor with eight poles would run at 900 RPM unloaded and at about 800 RPM under load.

## What is the difference between 6 pole and 8 pole motor?

The more poles the greater the torque so 8 pole motor will have more torque than a 6 pole. Lots of reasons why that I will not go into. However you also have to realize that the more poles the larger the physical size of the motor, more copper in the winding and therefore greater cost.

## How fast is a 4 pole motor?

Two 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. Example 120 x 60 hertz / 4 poles = 1,800 rpm.

## Which is better 2 pole or 4 pole motor?

A 2 pole motor has high speed due to less number of poles. Conversely, a 4 pole motor has low speed due to more number of poles. A 2 pole motor is more efficient on the flip side, a 4 poles motor is less efficient. A 2 pole motor has more RPM value; on the other side, the 4 poles motor has fewer revolutions per minute.

## How do you tell if a motor is 2 pole or 4 pole?

4 pole motor completes only half a cycle for every single cycle of the source. A 2 pole motor shows a north-south configuration. A 4 pole motor shows north-south-north-south configuration. 2 pole motor has high speed due to less number of poles.

## Can we increase the RPM of motor?

Yes, but with a small amount above the maximum speed under normal rated conditions. Increasing the speed can be achieved by increasing the supply frequency as the speed and frequency are directly proportional; however, there are two constraints.

## How do I lower the RPM on my electric motor?

A couple of things you can do:

- Use gears to change ratio of speed, which is what you’re going to do. …
- Use a stepper motor, which are commonly used for high-torque, low RPM applications.
- Find some sort of PWM control circuit to slow it down, although you probably won’t be able to get it down to 5-10RPM.

## Can a 50Hz motor run on 60Hz?

Electrical machines designed for 50Hz can usually work safely in 60Hz power supply, but not applicable to 60Hz machines to be run in 50Hz power supply.

## How many RPM is a 6 pole motor?

Six-pole motors run at 1,200 rpm unloaded (7,200 Ã· 6) and between 1,050 and 1,175 rpm loaded.

## What does a 6 pole motor mean?

6 poles = 1,000 RPM (~970 RPM) 8 poles = 750 RPM (~720 RPM) For a 60 Hz three phase supply: 2 poles = 3,600 RPM (nameplate would list around 3,500 RPM) 4 poles = 1,800 RPM (~1,740 RPM)

## What is a 4 pole 3 phase motor?

. For example, for a four-pole, three-phase motor, = 4 and = 1,500 RPM (for = 50 Hz) and 1,800 RPM (for. = 60 Hz) synchronous speed. The number of magnetic poles, , is equal to the number of coil groups per phase.

## How do you slow down an AC motor?

YES, you can easily slow down or reduce the rated speed by applying variable voltage or frequency. For slip-ring induction motors this process is very easy and it can be done by inserting a series resistance in rotor circuit (it will vary the motor torque also).

## What is the rpm of 1HP motor?

1HP 750 W 1 HP 3000 RPM Three Phase AC Induction Motor

Power | 1HP 750 W |
---|---|

Speed (RPM) | 1440,2880 |

Voltage | 230 |

## What is 120 in motor speed formula?

The equation for calculating synchronous speed is: S = 120 f/P speed = constant (120) times frequency of power source (60 Hz) divided by number of poles used in the motor (P).