Starter Basics

1
Starter Basics
P 206
2
Motor Principles

• DC motors interaction of magnetic fields to
  convert electrical energy to mechanical energy
• Current is applied to field and armature
• Conductor tends to move from weak magnetic field
  to strong magnetic field.
• For armature to continue rotating, the current
  flow must be reversed.

3
Conductor Current

• Conductor has magnetic flux lines around it
• Opposes north and south fields which causes loop
  of wire to turn.

Page C138
4
Magnet

• Has north and south pole.
• Magnetic lines of force move from north to south
  pole.

Page C138
5
Conductor in Magnetic Field

• As current travels through conductor and fields,
  conductor moves.

PAGE C138
6

• Flux lines always tend to want to be straight
• Fields act on each other

7
(No Transcript)
8
ROTATION OF CONDUCTOR IS IN DIRECTION OF WEAKER
FIELD.
PAGE C139
9
Electromagnetic Motor
Page C139
10

• Made of Laminated Core
• Solid Steel Shaft
• Commutator
• Lap and Wave Wound (P C141)

11
Stationary Field Windings

• Iron Core Windings concentrate magnetic field
• Fields have north and south pole based on
  direction windings are wound around pole shoes

12
3 Methods of Connecting Fields

• Series Wound
• Maximum torque when starts
• Shunt Wound
• Used in smaller motors
• Compound Wound
• Constant speed

Page C143
13

• The power is in the size of the windings, the
  size of the windings, the number of turns and how
  its wound

14
PERMANENT MAGNET STARTER MOTOR

• Has no field circuit
• Very light weight
• Usually gear reduction starter motors
• Fairly fragile
• Permanent magnets are stronger than typical
  permanent motors (Made of boron, neodymium and
  iron)

15
AND THATS ALL!!