# Question: How Do You Reduce The Speed Of An AC Motor?

## How can the speed of an induction motor be reduced?

There are several ways to control the speed of an induction motor.Reduce the voltage applied to the motor.

Control the current to the motor.

Use a wound-rotor motor and control the resistance applied to the rotor windings.

Control the frequency and voltage applied to the motor..

## Does voltage affect AC motor speed?

AC motors are unique because they are built to run at specific speeds regardless of their design or manufacturer. The speed of an AC motor is dependent on the number of poles it has and the line frequency of the power supply, not on it’s voltage. Common AC motor units are constructed with either two or four poles.

## How do you slow the speed of a motor?

Most DC motors can be slowed down by reducing the supply level of power, Volts, lower volts and resulting less amps, will create less electrical field and will slow motor down. For more gradual speed control there are electronic solutions that are called PWM (Pulse Width Modulation) controllers or Mosfet H bridges.

## 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.

## Which is better AC or DC motor?

AC motors are generally considered to be more powerful than DC motors because they can generate higher torque by using a more powerful current. However, DC motors are typically more efficient and make better use of their input energy.

## 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.

## How do you control the speed of a single phase AC motor?

The two primary ways to control the speed of a single-phase AC motor is to either change the frequency of the line voltage the motor sees or by changing the voltage seen by the motor, thereby changing the rotational speed of the motor.

## How many Poles is a 1200 rpm motor?

SixIt is beneficial to become aware of the different speed-related sounds motors make. Six-pole motors run at 1,200 rpm unloaded (7,200 Ã· 6) and between 1,050 and 1,175 rpm loaded.

## What is the maximum rpm of an electric motor?

In typical combustion engines found in vehicles, the torque is low at idling speed, reaches a maximal value between 1,500 and 6,500 RPM, and then falls more or less sharply toward the redline. Below the RPM of maximal torque, the compression is not ideal.

## 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.

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

-lbs of torque per horsepower where a 2-pole motor has 1.5 ft. -lbs of torque. At 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.

## Can a AC motor run on DC?

An AC motor cannot run on an DC SUPPLY.. The DC series motor can run on both AC &DC supply . It is also called as an Universal motor. … So both flux and current reverses making the direction of rotation of motor in the same direction…

## What controls the speed of an electric motor?

The speed of an electric motor is determined by its physical construction and the frequency of the voltage supply. Electrical engineers select motor speed based on the needs of each application, similar to how horsepower is specified based on the mechanical load.

## 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 happens if DC supply is given to AC motor?

When A.C. supply is given to a D.C. motor: 1)In case of Series connection of armature winding and field winding , it may run. 2)But, In case of parallel connection , it won’t rotate at all and will start humming and will create vibrations, as a torque produced by positive and negative cycle will cancel out each other.

## How can I speed up my AC motor?

You increase the speed by increasing the frequency. If a motor base speed is 60 Hz, raising the frequency to 120 Hz will double the speed of the motor. However, if you do not keep the volt to hertz ratio constant, you will cause the motor windings to heat up.

## How can you tell if a motor is AC or DC?

Look for the stator core construction and rotor. If there is no commutator, then it is a AC motor. If there is a commutator and brushes, it may be either a DC motor or an AC commutator motor (Universal motor).

## What is the rpm of 1hp motor?

3600 RPMLet’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 makes an electric motor go faster?

One easy way to make the motor run faster is to add another magnet. Hold a magnet over the top of the motor while it is running. As you move the magnet closer to the spinning coil, one of two things will happen. Either the motor will stop, or it will run faster.