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Slide 1

Electric Motor

Electric Motor

By Princess Barcega

APG School

Slide 2

Magnetic Force On A Current  Carrying Conductor

Magnetic Force On A Current Carrying Conductor

The magnetic force (F) the conductor experiences is equal to the product of its length (L) within the field, the current I in the conductor, the external magnetic field B and the sine of the angle between the conductor and the magnetic field. In short

F= BIL (sin)

Slide 3

The force on a current-carrying conductor in a magnetic field:

The force on a current-carrying conductor in a magnetic field:

When a current-carrying conductor is placed in a magnetic field, there is an interaction between the magnetic field produced by the current and the permanent field, which leads to a force being experienced by the conductor:

Slide 4

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 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):

Slide 5

Flemings left-hand rule

Flemings left-hand rule

Slide 6

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

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

I

F

B

Slide 7

Motion of a current-carrying loop in a magnetic field

Motion of a current-carrying loop in a magnetic field

N

S

L

R

I

F

F

Rotation

Commutator (rotates with coil)

brushes

Slide 8

Vertical position of the loop:

Vertical position of the loop:

N

S

Rotation

Slide 9

Electric Motor

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.

Slide 10

Parts of the Motor

Parts of the Motor

Armature or rotor

Commutator

Brushes

Axle

Field magnet

DC power supply of some sort

Slide 11

Motor Illustration

Motor Illustration

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