1. DC and AC Charging System Principles
Topics covered in this presentation:
DC Generator Construction and Magnetic Principles
Alternator Construction
Magnetic Principles of the Rotor and Stator
next

2. Typical DC Generator Construction
Cooling fan
Front bearing assembly
Commutator
Housing with pole shoes
Drive pulley
Front casing
Brush
Armature
End housing and brushes
next

3. DC Generator Magnetic Principles
Magnets (pole shoes)
Conductor (armature)
Split ring segments (commutator)
Battery
Carbon brushes
next

4. DC Generator Magnetic Principles
Magnets
Conductor
Output voltage (no split ring)
Split ring
Max +V
Output voltage
Peak to peak voltage
Max -V
next

5. Typical Alternator Construction
Rectifier assembly
Brush box and regulator
Slip ring end housing
End cover
Drive pulley
Cooling fans
Stator
Rotor
next

6. Magnetic Principles of Operation
Winding
Voltmeter
Laminated soft iron core
North yoke
South yoke
Rotating shaft
next

7. Magnetic Principles of Operation
Galvanometer
Laminated soft iron core
Flux lines
Output voltage
Magnet rotates 90° further
Conductor winding
Magnet
Magnet rotates
next

8. Rotor Construction Supply connections North pole claw
Slip rings and brushes
South pole claw
Field windings
next

9. Rotor Magnetic Field
Stator windings
Curved flux lines
next

10. Stator Windings and Magnetic Principles1
Stator windings (3) 2 3
North pole flux lines, current flow direction indicated by + and -
South pole flux lines, current flow direction indicated by + and - 3 2 1
Max emf generated in winding 1, reduces as magnet rotates
Emf generated in all 3 windings
next

11. Stator Construction and Coil Connections
3 outputs
Unrectified output waveforms
Delta
Star
Enamel copper wire windings
Soft iron laminations
end