The flashcards below were created by user
Ordonez
on FreezingBlue Flashcards.
-
Charging System - what is it's purpose ?
to provide the electrical power required to operate the vehicle electrical components and to recharge the battery whenever necessary.
-
Charging Systems converts _______ energy into _______ energy ?
Mechanical Energy into Electrical Energy.
-
What are the 2 Stator types ?
Y-Wound Stators & Delta-Wound Stators
-
Y-Wound Stators - name 3 points
- has a neutral junction
- two windings always form a series circuit between a positive & a negative diode.
- Y-Wound Stators produce more voltage at lower generator speeds.
-
Delta-Wound Stators - name 3 points
- has NO neutral junction
- the windings always form 2 parallel circuit paths between a positive and 2 negative diodes
- have greater current output a higher speeds but do not deliver as much current at lower speeds
-
Brushes ride __________.
on the surface of the slip rings.
-
What is a Sine Wave ?
distinctive wave form of AC voltage produced by a passing a magnet past a conductor.
-
A cycle ?
is one complete sine wave - when referring to an AC voltage event.
-
Frequency ? 2 - Points
- Measured in Hertz (Hz) events in one second
- measurement of how many times an event occurs in a fixed time frame.
-
Alternating Current in a generator is rectified by:
diodes.
-
The component that is turned by the generator drive belt and creates a rotating magnetic field is the:
Rotor
-
Automotive generators w/ 3 stator windings generally us _______ diodes to rectify the output current.
6
-
Generator brushes ride on _____ to feed current to the rotors windings.
Slip Rings.
-
The regulator in a charging system device that controls:
Voltage levels in the charging systems.
-
Generator output is directly related to:
field strength & rotor speed.
-
Voltage Regulators (purpose)
limit voltage produced by a generator by controlling the field current in the generator rotor winding.
-
Most Voltage Regulators operate in the range of:
13.0V - 15.5V
-
What is the purpose of the Generator Output Test ?
is to determine whether the generator is capable of delivering its specified current output.
-
Charging Systems test are performed using: (3 answers)
- a multimeter
- an oscilloscope
- a load tester
-
A voltage drop of more than ____ indicates high resistance in ground wiring of the charging systems.
0.2V
-
Positive Circuit Voltage Drop Connections - where do you hook up the leads hombre ?
Connect the Voltmeter's positive lead to the generator output terminal and the voltmeter's negative lead to the positive battery terminal.
-
Ground Circuit Voltage Drop Connections - How are the leads hook'd up ? Hombre ?
connect the voltmeter's negative lead to the generator housing and the voltmeter's positive lead to the negative battery terminal.
-
If the generator drive belt tension is adjusted too tightly: (2 answers)
- the belt will wear out prematurely
- the generator pulley and bearings can be damaged.
-
A generator drive belt in poor condition and not tensioned properly will result in an:
- an undercharge battery
- a squealing noise after the engine is started
-
Duty Cycle
Duty cycle is a measurement of % of a cycle that current is flowing (on time)
-
What should be the first step - beginning with any electrical system repairs ?
Disconnect the negative battery.
-
Windings that are dark & burnt are an indication of a ________ ? (Rotor Checks)
short rotor winding.
-
Continuity Test ? (2 points)
- Check resistance across the slip rings using an ohmmeter.
- Resistance should be between 1.5 to 4.0 ohms at room temperature
-
How to check Rotor for a Short-To-Ground
place the ohmmeter leads between the slip rings and rotor shafts. You should have an infinite reading - indicating no continuity to ground.
-
Stator Continuity Test
- Using a digital ohmmeter, test for continuity between each pair of stator leads.
- maximum resistance should be less than 0.5 ohms
-
How to test for Opens & Internal Shorts on Delta Windings ?
Due to the design of Delta-Wound stators, they cannot be checked for opens & internal shorts.
-
Stator Ground Tests
- Using a ohmmeter to check the resistance between a stator lead and the stator frame.
- Ohmmeter should read infinite.
-
When checking rectifier diode
One side will be open & one side will have a resistance reading.
-
Internal Voltage Regulator
A-Type, its powered all the time & regulates on the ground side (PCM or Case Ground)
-
External Voltage Regulator
B-Type, its grounded all the time & regulated on the power side.
-
Semiconductors - definition
can conduct or block electrical current.
-
Diodes
allow current to flow through them in one direction.
one way check valve
-
Capacitors
- hav the ability to absorb & store electrical charges and then release it into the circuit
- are used for electrical noise and voltage spike suppression.
-
Rectification
Since a diode will allow current to flow in one direction and not the other, it can be used to turn AC to DC.
-
Zener Diode
- Allows current to flow in reveres bias at a specific voltage without damage.
- allows reverse current flow above a set reverse voltage.
-
-
-
-
-
Transistors
Acts as an electrical switch in a circuit.
-
The maximum current output of an alternator is regulated by:
the design of the stator winding.
|
|