LSy_w Charging system PT 1.
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Transcript of LSy_w Charging system PT 1.
http://www.youtube.com/watch?v=oYTrbDLSy_w
Charging system PT 1
Charging System
Purpose of charging system to keep battery at a fully charged state.
Provide power for all electrical loads
Alternator is the component that generates electricity to charge the battery.
Purpose
The principle of electromagnetic induction to generate electrical energy from mechanical energy
Electromagnetic induction involves the generation of an electrical current in a conductor when the conductor is moved through a magnetic field.
Principle
Demonstration with alternator on how electricity is generated.
How can we increase electricity
How do we increase electricity
Increasing the speed of the conductor through the magnetic field.
Increasing the number of conductors passing through the magnetic field
Increasing the strength of the magnetic field.
Increasing Current
AC– Alternating current
DC– Direct Current
Alternator generates AC voltage.
Automotive battery and vehicle system using DC voltage.
AC and DC
So what changes the AC to DC voltage.
The voltage Rectifier.
Rectifiers are consisted with six diodes.
Diodes are one way check valves that only allow current to flow one way.
AC and DC
AC to DC
13.8 - 15 volts
27.4 – 28.4 volts
What is the proper system voltage?
Voltage regulator
What controls the system voltage?
- Controls the voltage output of the alternator.
- The regulator receives system voltage as an input, in order to regulate alternator output voltage.
Voltage Regulator
Voltage Regulator
End
http://www.youtube.com/watch?v=Yv4t795Yb5k&feature=related
Charging System PT2
Loose fan belt
Low engine RPM
Excessive load requirements (add on accessories)
What can cause the charging system to under-charge?
Short driving trips
Defective generator
Defective voltage regulator
Defective wiring
What can cause the charging system to under-charge?
Rotor, creates spinning magnetic field
Stator, creates alternating current
Slip Rings, allow field current into the rotor
Brushes, allow field current into rotor
Voltage Trace for Three Stator Windings
Full Wave Rectification …... three stator windings
Actual voltage trace of each stator winding after full wave rectification
voltage trace on oscilloscope
(diode pattern)
Stator
Rectifier (Diode pack)
The regulator will turn on/off current to the field windings (rotor) Increasing current to the rotor… …will increase generator output
How does the voltage regulator control the A/C generator?
1 V
14 V
80 o F
http://www.youtube.com/watch?v=Bzz7P3qNHcE