Charging System final pp

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					Charging system PT 1
http://www.youtube.com/watch?v=oYTrbD
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Purpose
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.
Principle
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.
How do we increase electricity
Demonstration with alternator on how electricity
is generated.


How can we increase electricity
Increasing Current
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.
AC and DC
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 to DC
What is the proper system voltage?

            13.8 - 15 volts

          27.4 – 28.4 volts
What controls the system voltage?

         Voltage regulator
         Voltage Regulator
- Controls the voltage output of the
  alternator.


- The regulator receives system
  voltage as an input, in order to
  regulate alternator output voltage.
Voltage Regulator
End
http://www.youtube.com/watch?v=Yv4t795Yb
5k&feature=related
What can cause the charging system to
under-charge?


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
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)
 How does the voltage regulator control
 the A/C generator?


 The regulator will turn on/off current
to the field windings (rotor)

Increasing current to the rotor…
 …will increase generator output
  14 V



80 o F
  1V
http://www.youtube.com/watch?v=Bzz7P3qNHcE

				
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posted:10/1/2012
language:English
pages:32