A 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.

## Is a 2 pole motor faster than a 4 pole motor?

2 pole motor has high speed due to less number of poles. A 4 pole motor has low speed due to more number of poles. 2 pole motor has less workout when compared to a 4 pole motor.

## What speed does a 4 pole motor run at?

Considering a 60 Hz power source, at what speed does a four-pole synchronous motor run? The correct answer is B, 1800 revolutions per minute (RPM).

## What is the rpm of a 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 do you calculate motor speed?

One crucial measurement is revolutions per minute, or RPM, which describes the speed of a motor.

…

At 60 Hz, a motor with two poles operates at 3,600 RPM with no load and about 3,450 RPM with a load:

- (Hz x 60 x 2) / number of poles = no-load RPM.
- (60 x 60 x 2) / 4.
- 7,200 / 2 = 3,600 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.

## 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).

## 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 |

## 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).

## 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. When it comes to the pole number it’s always a multiple of two because the north and the South Pole always come in pairs.

## 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.

## 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 |

## 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.

## What is the speed of a DC motor?

DC controls adjust speed by varying the voltage sent to the motor (this differs from AC motor controls which adjust the line frequency to the motor). Typical no load or synchronous speeds for an AC fractional horsepower motor are 1800 or 3600 rpm, and 1000-5000 rpm for DC fractional hp motors.

## 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.

## What is speed of a motor?

Definition. Speed of a motor is the magnitude of the rotational velocity of the motor shaft. In a motion application, speed of the motor dictates how fast the axis rotates – the number of complete revolutions per unit time.