# Question: How Many Poles Is A 1200 Rpm Motor?

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

about 1800 rpmAt 60 Hz, a 4-pole motor is about 1800 rpm where a 2-pole motor is 3600 rpm.

Thus, the 4-pole motor provides higher efficiency, higher torque per unit of volume and weight..

## How is motor RPM calculated?

RPM = a/360 * fz * 60 RPM = Revolutions per minute.

## What is the rpm of 1 hp motor?

Let’s look a two 1 HP motors. The 1800 RPM, 1HP motor produces 3 ft. lbs of torque at 1800 RPM. The 3600 RPM, 1HP motor produces 1.5 ft.

## 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 are poles of 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.

## How many Poles does a 900 rpm motor have?

Synchronous rotation speed at different frequencies and number of polesShaft rotation speed – n – (rev/min, rpm)Frequency – f – (Hz)Number of poles – p -804800800905400900100600010008 more rows

## How many Poles is my motor?

The actual running speed is the synchronous speed minus the slip speed. 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).

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

A 4-pole motor is within 4 magnetic poles on the rotor and the number of related electro-magnetic windings (circuits). A 4-pole motor has about 3.0 ft-lbs of torque per horsepower whereas a 2 pole motor has 1.5 ft-lbs of torque. At 60Hz, a 4-pole motor is about 1800 rpm where a 2-pole motor is 3600 rpm.

## How many RPM is a 8 pole motor?

900 rpmTo 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 is 120 in motor speed formula?

The formula for calculating synchronous speed is: Sync. Speed (in RPM) = 120 x Frequency (Hz) / # poles.

## How can I reduce the rpm of a 3 phase motor?

The speed control of three phase induction motor from stator side are further classified as :V / f control or frequency control.Changing the number of stator poles.Controlling supply voltage.Adding rheostat in the stator circuit.

## What is the rpm of 3hp motor?

2800 Rpm3 HP Electric Motor Single PhaseModel:3HP220V2800Horse Power:3 HPVoltage:220 VoltRPM:2800 RpmHertz:503 more rows

## Which motor Cannot be started on no load?

Speed of DC Series Motor ωm = Very high, which is also clear from the Speed Current Characteristics of DC Series Motor as shown in figure above. Therefore if the DC Series Motor is started at No Load then the speed of DC Series Motor will become dangerously high which will definitely damage the DC Series Motor.

## 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).

## How many RPM is a 6 pole motor?

Approximate Electrical Motor Speed (rpm)No. PolesSpeed with Rated LoadSynchronous Speed (no Load)41725180061140120088509002 more rows

## What is RPM of motor?

CARS.COM — RPM stands for revolutions per minute, and it’s used as a measure of how fast any machine is operating at a given time. In cars, rpm measures how many times the engine’s crankshaft makes one full rotation every minute, and along with it, how many times each piston goes up and down in its cylinder.

## How do you reduce the speed of an AC motor?

AC motors are constant speed devices but their speed can vary if you change the input voltage or frequency or the windings that make the motor rotate. The most common and efficient way of changing the speed is to vary the frequency by using an inverter as the power supply.

## How can we increase the RPM of motor?

Here are 4 step mentioned to increase the electric motor power.Eliminate Voltage Unbalance.Connect Motors to Variable Frequency Drives (VFDs) to Improve Efficiency.Choose Motors in the Right Size.Proper Maintenance Is a Must.