Charging Systems Flashcards
How much voltage does the alternator produce at idle?
13-16 volts
At what RPM does the alternator produce the best?
1700 - 3000RPM
What is the minimum drive cycle required to charger a battery?
7-10 minutes
How many Volts of pressure will an Alternator produce if not controlled?
over 200v
What process does an alternator use to produce electricity?
Induction
How much current does a rotor assembly use?
4 - 6 amps
what determines alternator size?
number & type of consumers
what does an alternator use to control the current output?
Nothing! AC generators naturally limit current output
What does an alternator use to control the voltage output?
Voltage Regulator
What 2 winding configurations are used?
Delta winding & Wye winding
How many phases (electrical waves) are used in a typical alternator?
usually 3, but can be up to 6
What is an Overrunning Alternator Clutch?
allows slippage of the alternator pulley one way
What is an Overrunning Alternator Decoupler?
uses a torsion absorbing spring mechanism inside to smooth out vibrations
What is the purpose of the diode trio?
to provide current flow to the field
What 3 factors determine the amount of induced voltage produced through induction?
Speed, number of conductors & strength of magnet
Which device changes AC to DC?
A rectifier (made up of diodes)
Where is output voltage produced?
Stator
current through ________ is controlled by the voltage regulator.
The Field
What is acceptable voltage, between the alternator B+ terminal and ground, when testing an alternator?
below 0.5v
When using a battery load tester, where should the engine speed be?
2000RPM
In a Type-A circuit, where is the regulator placed?
in the ground side of the field circuit
In a Type-B circuit, where is the regulator placed?
in the power side of the field circuit
Which type of stator winding figuration produces the maximum current output?
Delta Winding
What type of rectification changes AC voltage to DC voltage?
full-wave rectification
Where do the brushes carry current?
The Field
What is the major voltage control device inside the regulator?
Zener Diode
Where are the brushes connected to?
slip rings
What would be the duty cycle of a field current during a high current demand situation, in a computer controlled Alternator?
approx. 80%
What controls the amperage output of the alternator?
Rotor current
What is the maximum allowable reading when testing the voltage drop on the feed circuit?
0.5v
What is the specific purpose of the Zener Diode in an alternator?
allows the voltage regulator to sense voltage
