CHARGING SYSTEMS Induced Voltage AC Charging Systems Preliminary Checks AC Generator Service Converts Mechanical Energy into Electrical Energy
INDUCED VOLTAGE 3 Stationary Windings (stator) Rotating Claw Shoes (rotor) 12 Volts – 300 Volts Out normal output 13-15 volts
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
ALTERNATOR COMPONETS Rotor Stator Housings/ Frame Shaft & Bearings Terminals Slip Rings Cooling Fan Belts Rotor Stator Housings/ Frame Shaft & Bearings Drive Pulley & Fan Diodes Regulator
STATOR Stator is stationary Does not move Electricity is induced in the stator
ROTOR Rotor Rotates-spins Magnetic field is made in ROTOR 2 pole shoes N and S Windings Slip rings
SLIP RING END FRAME BAT terminal hot at all times
DRIVE END FRAME
CAPACITOR
DIODE TRIO
BRUSH HOLDER
VOLTAGE REGULATOR
HEAT SINK & RECTIFIER
ALTERNATOR OPERATION Three items necessary to produce current flow 1- Conductors (stator) 2- Magnetic Field (rotor) 3-Motion (belt drive from crankshaft)
Alternator Operation DC Rectification Voltage Regulation Half Wave Full Wave Voltage Regulation Sensing Voltage Field Circuits
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
VOLTAGE REGULATION Integral Regulator Uses Transistors and a Zener Diode Controls current to the Field Winding in the Rotor Low Voltage On High Voltage Off
Electronic Regulators Integrated Circuit Voltage Regulators Fail-Safe Circuits Computer Regulation
Old Voltage Regulators
Indicators Indicator Lights Voltmeter Ammeter
Basic Checks Safety Precautions Inspection General Tests
General Tests Voltage Output Test Current Output Test Regulator Bypass Test Oscilloscope Checks Circuit & Ground test
ALTERNATOR LAB Disassemble alternator Learn all parts Pass instructor’s quiz Learn operation Reassemble alternator