Charging Systems: Summary

The most common method of stator connection is called the wye connection. In the wye connection, one lead from each winding is connected to one common junction. From this junction, the other leads branch out in a Y pattern. Another method of stator connection is called the delta connection....

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HEV Charging Systems

A BAS used on some HEVs
HEVs utilize the automatic stop/start feature to shut off the engine whenever the vehicle is not moving or when power from the engine is not required. Some HEV systems use a starter/generator unit to perform both functions. The difference between a motor and a generator is the motor uses two...

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AC Generator Design Differences

10SI AC generator
All AC generators operate on the same principles, there are differences in the styles and construction. General Motors 10SI Series FIGURE. 10SI AC generator. SI series AC generators use an internal voltage regulator that is mounted to the inside of the slip ring end frame. There are three terminals on the rear-end frame...

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Charging Indicators

Electronic regulator with an indicator light on due to no AC generator output
There are three basic methods of informing the driver of the charging system's condition: indicator lamps ammeter voltmeter Indicator Light Operation As discussed earlier, most indicator lamps operate on the basis of opposing voltages. If the AC generator output is less than battery voltage, there is an electrical potential difference in the...

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Regulation

The regulator can control the field current by (A) controlling the resistance in series with the coil, or (B) by switching the field on and off
The battery, and the rest of the electrical system, must be protected from excessive voltages. To prevent early battery and electrical system failure, regulation of the charging system voltage is very important. Also, the charging system must supply enough current to run the vehicle's electrical accessories when the engine is...

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AC Generator Operation Overview

(A) Individual stator winding voltages; (B) voltages across the stator terminal A, B, and C
When the engine is running, the drive belt spins the rotor inside the stator windings. This magnetic field inside the rotor generates a voltage in the windings of the stator. Field current flowing through the slip rings to the rotor creates alternating north and south poles on the rotor. The induced...

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AC Generator Circuits

The diode trio connects the phase windings to the field. To conduct, there must be 0.6 V more positive on the anode side of the diodes
There are three principal circuits used in an AC generator: The charging circuit: Consists of the stator windings and rectifier circuits. The excitation circuit: Consists of the rotor field coil and the electrical connections to the coil. The preexcitation circuit: Supplies the initial current for the field coil that starts...

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