# How can you control the speed of a permanent magnet on a DC motor?

## How can you control the speed of a permanent magnet on a DC motor?

As the magnetic field strength of a permanent magnet is fixed it cannot be controlled externally, field control of this type of DC motor cannot be possible. Thus permanent magnet DC motor is used where there is no need to control the speed of the motor (which is usually done by controlling the magnetic field).

How can we reduce RPM of DC motor?

A couple of things you can do:

1. Use gears to change ratio of speed, which is what you’re going to do.
2. Use a stepper motor, which are commonly used for high-torque, low RPM applications.
3. 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.

### How do you increase the speed of a magnetic motor?

The speed of the motor can be increased by:

1. increasing the strength of the magnetic field.
2. increasing the current flowing through the coil.

What happens if you add more magnets to a DC motor?

Adding stronger magnets can affect a DC motor. Increasing the strength of the DC motor’s magnet will increase the amount of magnetic force generated per Amp of current flow.

## What is the purpose of permanent magnet in a DC motor?

A permanent magnet motor is one in which a magnet, or pair of magnets, provides the static magnetic field in which the rotor rotates. The rotor consists of a central axle on which are mounted the armature coils and, to provide electrical contact, the commutators, to which the ends of the armature coils are connected.

How can RPM be reduced?

Reducing RPM can be accomplished by using two or more pulleys and belts to transmit and change the speed of rotation.

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

How to improve torque and RPM of a DC motor?

1. Case 1: Increase/Decrease strength of permanent magnets. What would happen to torque and RPM?
2. Case 2: Increase/Decrease size of magnet wires.
3. Case 3: Increase/Decrease the size of armature.
4. Case 4: Increase/Decrease the number of turns (coil).

How can I make my DC motor faster?

Thus, the speed of a DC motor can be controlled in three ways:

1. By varying the supply voltage.
2. By varying the flux, and by varying the current through the field winding.
3. By varying the armature voltage, and by varying the armature resistance.

## How does the strength of a magnet affect a motor?

If you increase strength of the permanent field magnet, you increase motor’s magnetic flux. As a result, generated voltage increases and line current decreases which is followed by decrease in induced torque and motor speed decreases.