AUTOMOTIVE CHARGING SYSTEMS PURPOSE OF CHARGING SYSTEM b

AUTOMOTIVE CHARGING SYSTEMS

PURPOSE OF CHARGING SYSTEM b CONVERT MECHANICAL ENERGY INTO ELECTRICAL ENERGY b RECHARGE BATTERY b PROVIDE POWER FOR ELECTRICAL ACCESSORIES b RESERVE POWER WHEN NEEDED

COMPONENTS OF CHARGING SYSTEM b BATTERY b ALTERNATOR b DRIVE BELT b VOLTAGE REGULATOR b CHARGE INDICATOR (LAMP OR GAUGE)

TYPICAL CHARGING SYSTEM

ALTERNATING CURRENT OPERATION b ELECTROMAGNETIC INDUCTION TO PRODUCE ELECTRICAL POWER • VOLTAGE WILL BE PRODUCED IF MOTION BETWEEN A CONDUCTOR AND A MAGNETIC FIELD OCCURS. b AMOUNT OF VOLTAGE IS AFFECTED BY: • • • SPEED OF CONDUCTOR PASSING THROUGH FIELD STRENGTH OF MAGNETIC FIELD NUMBER OF CONDUCTORS PASSING THROUGH MAGNETIC FIELD

COMPONENTS OF ALTERNATOR b FRONT HOUSING ( DRIVE END ) b REAR HOUSING ( COM END ) b STATOR b ROTOR b REGULATOR b BRUSHES b RECTIFIER ASSEMBLY b BRUSH HOLDER

ROTOR b COPPER WIRE WOUND AROUND A IRON CORE b CURRENT PASSING THROUGH ROTOR CREATES A MAGNETIC FIELD b MAGNETIC FIELDS PRODUCE A VOLTAGE BY INDUCTION IN STATOR WINDINGS

ROTOR FIELD CIRCUIT b CONTROLS ALTERNAOTR OUTPUT b INCREASED FIELD CURRENT RESULTS IN INCREASED ALTERNATOR OUTPUT b TWO BRUSHES PROVIDE CONNECTION TO FIELD COIL

STATOR b THREE SETS OF WINDINGS AROUND LAMINATED CORE b SMALL GAP BETWEEN ROTOR AND STATOR PERMITS FIELD CIRCUIT TO ENERGIZE WINDINGS OF STATOR AT THE SAME TIME.

STATOR WINDINGS b STATOR WINDING CONNECTIONS • WYE • DELTA b OVERLAPPING STATOR WINDINGS PRODUCE PHASE ANGLES PAGE C-170 33

DIODE RECTIFIER BRIDGE b CHANGES NEGATIVE CURRENT INTO POSITIVE OUTPUT b CONVERTS AC (ALTERNATING) VOLTS TO PULSING DC VOLTS b 3 POSITIVE BIASED DIODES b 3 NEGATIVE BIASED DIODES b NUMBER OF POLES ON ROTOR AND NUMBER OF PHASES ON STATOR WILL DETERMINE HOW SMOOTH OUTPUT IS.

AC VOLTAGE EFFECT WITH DIODE OPERATION

STATOR CURRENT FLOW PHASE 1 A AND B POSITIVE

STATOR CURRENT PHASE 2 A AND C NEGATIVE

STATOR CURRENT PHASE 3 B AND C POSITIVE

ALTERNATOR INTERNAL CIRCUITS b CHARGING CIRCUIT • STATOR WINDINGS AND RECTIFIER b EXCITATION CIRCUIT • FIELD COIL AND CONNECTIONS b PRE-EXCITATION CIRCUIT • SUPPLIES INITIAL CURRENT FOR FIELD COIL

THE END STAY TUNED FOR FURTHER DEVELOPMENTS!