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Alternator vs Generator

Alternator vs Generator. Basic Theory Advantages/Disadvantages. Inductance. Moving magnetic field in relation to conductor, generates electron flow Electricity is generated Faster movement, more flow Larger field, more flow Each conductor produces a fraction of output. Generator.

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Alternator vs Generator

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  1. Alternator vs Generator Basic Theory Advantages/Disadvantages

  2. Inductance • Moving magnetic field in relation to conductor, generates electron flow • Electricity is generated • Faster movement, more flow • Larger field, more flow • Each conductor produces a fraction of output

  3. Generator • Windings spin within magnetic field • RPM limited, low RPM, low output • Magnetic strength has low variability • Operates well at high engine RPM • Generates it’s own field and flow from residual magnetism • It turns, it works

  4. Alternator • Magnetic field spins within windings • High variability in gauss • Low RPM, strong magnet • High RPM, weaker magnet • Needs voltage to generate voltage • Dead battery, no output

  5. Wide range of RPM Lighter in weight More delicate Needs field current More complicated Narrow RPM range Heavier for output Bulletproof Needs to turn Very simple system Alternator/Generator

  6. Electrical System • Battery • Alternator/Generator • Distributing busses/ Breakers • Switches • Devices/Appliances • Safeties

  7. Battery • Battery voltage, 24 volts • Stores energy for start/ ground ops • Stabilizes against surges • Charges back from alternator • System voltage, 28 volts • Why the difference?

  8. Distributing Busses • Direct power to devices • Circuit protection • In some cases, load shedding

  9. Switches • Energize circuit • Directly or remotely • Remote, contactors, relays or solenoids • Higher power items are remotely controlled • Switches themselves are high drain • Knowledge is power

  10. Devices/Appliances • Radios, lights, fans etc. • High drain items • Resistance heat and lights • Transmitters • Passive receivers • In-Flight troubleshooting • Transponder, DME or Comm radio

  11. Safeties • Circuit breakers/Fuses • Overloads • Alt. control unit/Alt. field current • Most are nuisance trips • Reset and continue • Do not reset 2nd time

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