# What do magnets do in an electric motor?

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An electric motor converts electrical energy into physical movement. Electric motors generate magnetic fields with electric current through a coil. The magnetic field then causes a force with a magnet that causes movement or spinning that runs the motor.

## What is the role of magnet in electric motor?

An electric motor uses magnets to create motion. … On the other hand, the north end of one magnet will repel the north end of the other (and south will repel south). Inside an electric motor, these attracting and repelling forces create rotational motion.

## How does the magnets make a motor run?

Motor Rotation Using a Magnet/Magnetic Force

The basic operating principle of a motor is as follows. … ① When the outer magnets rotate (referred to as a rotating magnetic field),② The N and S poles attract and repel each other, ③ Causing the magnet with the rotational axis (center) to turn.

## How do magnets work in a simple motor?

This simple electric motor works by the magnetic force F = IL x B. The magnetic field at both of these spots points in the same direction. … Thus, the magnetic force on the wire at opposite ends of the loop points in opposite directions, causing it to spin.

## How do you make an electric motor more powerful?

We can increase the turning force (or torque) that the motor can create in three ways: either we can have a more powerful permanent magnet, or we can increase the electric current flowing through the wire, or we can make the coil so it has many “turns” (loops) of very thin wire instead of one “turn” of thick wire.

## What magnets are used in motors?

The permanent magnets commonly used in permanent magnet motors include sintered magnets and bonded magnets. The main types are AlNiCo, ferrite, samarium cobalt, neodymium iron boron, and so on.

## What provides a changing magnetic field in electric motor?

We use a special switch, called a commutator, and brushes to reverse the direction of the coil’s magnetic field every half-turn. Once the coil’s south pole is near the permanent magnet’s north, we switch the direction of the current through the coil. This reverses the coil’s magnetic field. … multiple coils inside motor.

## What do brushes do in a motor?

Carbon brushes, or electric motor brushes, play an important role in motors and generators, serving as electrical conductors. This is achieved by passing electrical current between the motor’s stationary and rotating wires. A carbon brush may have one or more carbon blocks and one or more shunts or terminals.

## Which is an important step in how an electric motor uses magnetic force to produce motion quizlet?

Which is an important step in how an electric motor uses magnetic force to produce motion? As the north pole of the electromagnet nears the north pole of the permanent magnet, the current reverses and the poles of the magnets then attract.

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## What keeps the wire coil spinning?

EXPLANATION: When electricity is passed through a wire coil (as you are doing when you connect the coil to the battery), you create an electromagnetic field, which pushes the coil away from the magnet. … When the circuit is complete again, the magnetic field once again repels the coil, so it keeps spinning.

## 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.

## How do you increase the torque of a motor?

The way to increase the torque that the motor delivers, mechanically, would be:

1. To increase the diameter of the wire in the windings (which is to say, completely remanufacture the motor)
2. to have the output shaft coupled to a gear reduction setup, which would lower the final drive rpms, but increase the torque.

## Why are DC motors more efficient?

They run faster than induction motors due to the fact that the speed is reduced by the slip of the asynchronous motor. … In fact, the DC motor is 30% more efficient than AC motors due to the secondary magnetic field being generated from the permanent magnets rather than copper windings.