lsy_w charging system pt 1
TRANSCRIPT
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http://www.youtube.com/watch?v=oYTrbDLSy_w
Charging system PT 1
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Charging System
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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
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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
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Demonstration with alternator on how electricity is generated.
How can we increase electricity
How do we increase electricity
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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
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AC– Alternating current
DC– Direct Current
Alternator generates AC voltage.
Automotive battery and vehicle system using DC voltage.
AC and DC
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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
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AC to DC
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13.8 - 15 volts
27.4 – 28.4 volts
What is the proper system voltage?
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Voltage regulator
What controls the system voltage?
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- Controls the voltage output of the alternator.
- The regulator receives system voltage as an input, in order to regulate alternator output voltage.
Voltage Regulator
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Voltage Regulator
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End
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http://www.youtube.com/watch?v=Yv4t795Yb5k&feature=related
Charging System PT2
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Loose fan belt
Low engine RPM
Excessive load requirements (add on accessories)
What can cause the charging system to under-charge?
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Short driving trips
Defective generator
Defective voltage regulator
Defective wiring
What can cause the charging system to under-charge?
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Rotor, creates spinning magnetic field
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Stator, creates alternating current
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Slip Rings, allow field current into the rotor
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Brushes, allow field current into rotor
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Voltage Trace for Three Stator Windings
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Full Wave Rectification …... three stator windings
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Actual voltage trace of each stator winding after full wave rectification
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voltage trace on oscilloscope
(diode pattern)
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Stator
Rectifier (Diode pack)
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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?
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1 V
14 V
80 o F
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http://www.youtube.com/watch?v=Bzz7P3qNHcE