AUTOMOTIVE CHARGING SYSTEMS CHAPTER 7

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.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 FIELDSPEED OF CONDUCTOR PASSING THROUGH FIELD STRENGTH OF MAGNETIC FIELDSTRENGTH OF MAGNETIC FIELD NUMBER OF CONDUCTORS PASSING THROUGH MAGNETIC FIELDNUMBER OF CONDUCTORS PASSING THROUGH MAGNETIC FIELD PG C165

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 C167 FIG 7-6

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 PG C167 & 168

ROTOR FIELD CIRCUIT b CONTROLS ALTERNAOTR OUTPUT b INCREASED FIELD CURRENT RESULTS IN INCREASED ALTERNATOR OUTPUT b TWO BRUSHES PROVIDE CONNECTION TO FIELD COIL PG C169

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 33 PHASE ANGLES PAGE C-170 PG C

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. PG C

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 RECTIFIERSTATOR WINDINGS AND RECTIFIER b EXCITATION CIRCUIT FIELD COIL AND CONNECTIONSFIELD COIL AND CONNECTIONS b PRE-EXCITATION CIRCUIT SUPPLIES INITIAL CURRENT FOR FIELD COILSUPPLIES INITIAL CURRENT FOR FIELD COIL

THE END THE END STAY TUNED FOR FURTHER DEVELOPMENTS!