# How can you reduce the speed of an electric motor?

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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 reduce the speed of a single phase motor?

Is is possible to control the speed of an induction motor (single or three phase) by reducing the voltage. This will reduce the magnetizing current, flux, and thereby increase the slip, by essentially reducing the rating.

## How do you make a motor 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.

## How do you make a motor spin faster?

The speed of rotation of the coil can be increased by:

1. increasing the size of the current;
2. using a stronger magnet;
3. increasing the number of turns of wire in the coil;
4. reducing friction between the coil and the axel it rotates on.
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## Can you slow down an AC motor?

Yes. If it’s a small fan motor or even a ceiling fan, this is often done by reducing voltage to the motor with a solid state control or a series inductance. This just increases the slip speed. A large AC motor can be slowed down with a Variable Frequency Drive.

## Can you speed control a PSC motor?

Speed is changed manually with a switch or controlled through a circuit board. The motors normally used for multi speeds are the PSC and the shaded pole single-phase motor. The PSC motor is the most commonly used and can have either tapped or alternated windings.

## How do you reduce the speed of a 3 phase motor?

Speed Control of Three Phase Induction Motor

1. V / f control or frequency control.
2. Changing the number of stator poles.
3. Controlling supply voltage.
4. Adding rheostat in the stator circuit.

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## How can you increase the strength of an electric motor?

An electric motor uses the motor effect to spin a coil of wire inside a magnetic field. To increase the speed of the motor: Increase the current in the coil.

To increase the voltage or current generated:

1. Spin the coil faster.
2. Put more loops on the coil.
3. Use a stronger magnetic field.
4. Use a coil with a larger area.

## How can we increase the rpm of dc motor?

By increasing the voltage of the armature, it produces more magnetic forces to overcome the field magnet, increasing the rpm. By increasing the field current, more magnetic fields opposing the motion are produced, at the same time more cemf is produced reducing the armature voltage, decreasing the rpm.

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## How fast can an electric motor spin?

Industrial motors can spin at a head-spinning 250,000 revolutions per minute. But a new matchbook-sized motor runs circles around the competition.

## Why will a motor not work without a commutator?

No, a direct current motor cannot run without a commutator because there is no induced electromotive force inside the armature. The commutator plays the function of supplying current to the armature from the brush. That is why the armature removed will not supply the motor.

## What causes an electric motor to rotate?

A coil of wire carrying a current in a magnetic field experiences a force that tends to make it rotate. This effect can be used to make an electric motor.

## How is rotation caused in a motor?

The coil of wire is mounted in the gap between the two magnets. The split rings make electrical contact with the coil and reverse the current every half turn. When an electric current flows through the coil, a force is exerted on the coil, causing it to spin.