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FUNDAMENTALS OF ELECTRIC

MOTOR

By

K. Palani Thanaraj & Vasantha Kumar

Department of Instrumentation &Control

SRM University

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OBJECTIVE

The objective of this project is to build a simple

electric motor from scratch.

To understand the inter relationship of electricity

and magnetism.

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THINGS TO KNOW ABOUT ELECTRIC

MOTORS

Important Parts necessary to understand the working

of an electric motor

Armature or Rotor

Brushes

Commutator

Field Magnet

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SIMPLE MOTOR SCHEMATIC

N SL R

i

Rotation

Commutator

Brushes

Battery

FieldMagnet

Coil

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I

F

B

OPERATING PRINCIPLE

When a current carrying conductor

is placed in a magnetic field it experiences

a force which tries to rotate the conductor

on its axis

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WHAT YOU WILL NEED :

A battery Holder

A battery

A magnet

Some magnet wire

Enamel Coated 22 Gauge thick wire

Length of 100 cms

Some heavier wire

Bare wire of 18 to 20 Gauge wire

Length of 30 cms

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STEP 1

FORMATION OF ARMATURE

Take the wire and wind it on a ball point pen or a small AAA

battery to make it in round form.

Leave couple of inches of wire free at the end.

Wind 25 to 30 turns of wire around the cylindrical support.

Now carefully pull the coil off the support.

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FORMATION OF ARMATURE COIL

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Wrap the free ends of the wire around the coil a couple of times.

The binding turns must be exactly opposite to each other.

The two ends of the coil must be in a straight line so they form a

good axle.

STEP 2

FORMATION OF AXLE

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FORMATION OF AXLE

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Take the copper wire and make it straight.

Remove the top half of the insulation from the wire.

Do the same thing to the other set of copper wire.

STEP 3

FORMATION OF SUPPORTING PILLARS

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Make small loops of the wire ends so that it is able

to support the armature.

Do the same to another wire, so you have two

supports.

Attach one end of the support wires to the batteryholder and the other end to hold the armature.

STEP 4

FORMATION OF SUPPORTING PILLARS

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FORMATION OF PILLARS

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FINISHED MOTOR

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THANK YOU