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# Electric Motors - PowerPoint PPT Presentation

Electric Motors. How to build an Electric Motor. http:// www.youtube.com/watch?v=it_Z7NdKgmY. Electric Motor Commutators. http:// www.youtube.com/watch?v=Ue6S8L4On-Y http:// www.youtube.com/watch?v=Xi7o8cMPI0E.

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## PowerPoint Slideshow about ' Electric Motors' - rusty

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Presentation Transcript

### Electric Motors

Electric Motor Commutators

• The magnitude of the force on the conductor depends on the magnitude of the current which it carries. The force is a maximum when the current flows perpendicular to the field (as shown in diagram A on the left below), and it is zero when it flows parallel to the field (as in diagram B, on the right):

Left-hand rule magnitude of the current which it carries. The force is a maximum when the current flows

I

B

F

Electric Motor external magnetic field and the force the conductor experiences

• An electromagnet is the basis of an electric motor

• An electric motor is all about magnets and magnetism: A motor uses magnets to create motion.

• Opposites attract and likes repel. Inside an electric motor, these attracting and repelling forces create rotational motion.

• A motor is consist of two magnets.

Electric Motor Animation external magnetic field and the force the conductor experiences

Parts of the Motor external magnetic field and the force the conductor experiences

• Armature or rotor

• Commutator

• Brushes

• Axle

• Field magnet

• DC power supply of some sort

Commutator and Brushes external magnetic field and the force the conductor experiences

• Commutator is simply a pair of plates attached to the axle. These plates provide the two connections for the coil of the electromagnet.

• Commutator and brushes work together to let current flow to the electromagnet, and also to flip the direction that the electrons are flowing at just the right moment.

0 external magnetic field and the force the conductor experienceso Position

What happens at 90 external magnetic field and the force the conductor experienceso

90 external magnetic field and the force the conductor experienceso Position

Motion of a current-carrying loop in a magnetic field external magnetic field and the force the conductor experiences

Rotation

F

I

R

N

L

S

F

brushes

Commutator (rotates with coil)

Answers external magnetic field and the force the conductor experiences

Answers Continued external magnetic field and the force the conductor experiences