1

CHARGING SYSTEMS

Induced Voltage

AC Charging Systems

Preliminary Checks

AC Generator Service

Converts Mechanical Energy into

Electrical Energy

2

INDUCED VOLTAGE3 Stationary Windings (stator)

Rotating Claw Shoes (rotor)

12 Volts – 300 Volts Out

normal output13-15 volts

3

AUTOMOTIVE CHARGING SYSTEM

Purpose:

(1) Provide electrical power to the vehicle while the engine is running

(2) Charge the battery

Components: Alternator, Voltage Regulator, Wiring, Indicator, Drive Belt

4

ALTERNATOR COMPONETS

Rotor

Stator

Housings/ Frame

Shaft & Bearings

Drive Pulley & Fan

Diodes

Regulator

TerminalsSlip RingsCooling FanBelts

5

STATORStator is stationary

Does not move

Electricity is induced in the stator

6

ROTOR

Rotor Rotates-spins

Magnetic field is made in ROTOR

2 pole shoes N and S

Windings

Slip rings

7

SLIP RING END FRAME

BAT terminal

hot at all times

8

DRIVE END FRAME

9

CAPACITOR

10

DIODE TRIO

11

BRUSH HOLDER

12

VOLTAGE REGULATOR

13

HEAT SINK & RECTIFIER

14

ALTERNATOR OPERATION

Three items necessary to produce current flow1- Conductors (stator)2- Magnetic Field (rotor)3-Motion (belt drive from crankshaft)

15

Alternator Operation

DC RectificationHalf WaveFull Wave

Voltage RegulationSensing Voltage

Field Circuits

16

CONVERTING AC to DC

Alternator produces AC due to north and south magnet

Diode blocks current flow in one direction converting AC to DC

Current flow is DC at battery terminal

17

VOLTAGE REGULATION

o Integral Regulatoro Uses Transistors and

a Zener Diodeo Controls current to

the Field Winding in the Rotor

o Low Voltage Ono High Voltage Off

18

Electronic Regulators

Integrated Circuit Voltage Regulators

Fail-Safe Circuits

Computer Regulation

19

Old Voltage Regulators

20

Indicators

Indicator Lights

Voltmeter

Ammeter

21

Basic Checks

Safety Precautions

Inspection

General Tests

22

General Tests

Voltage Output Test

Current Output Test

Regulator Bypass Test

Oscilloscope Checks

Circuit & Ground test

23

ALTERNATOR LAB

Disassemble alternator

Learn all parts

Pass instructor’s quiz

Learn operation

Pass instructor’s quiz

Reassemble alternator