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## PowerPoint Slideshow about ' Electric Motors' - rusty

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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

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):

The directional relationship of I in the conductor, the external magnetic field and the force the conductor experiences

I

B

F

Electric Motor

- 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

- http://www.youtube.com/watch?v=d_aTC0iKO68&safety_mode=true&persist_safety_mode=1&safe=active

Parts of the Motor

- Armature or rotor
- Commutator
- Brushes
- Axle
- Field magnet
- DC power supply of some sort

Commutator and Brushes

- 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.

Motion of a current-carrying loop in a magnetic field

Rotation

F

I

R

N

L

S

F

brushes

Commutator (rotates with coil)

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