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Last Updated on: Wednesday, June 02, 2021 01:45 PM

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Battery Charging Generator Starter  (February 26, 2011)
designed by David A. Johnson, P.E.

As the drawing below illustrates, the alternator was wired in a three phase “Y” configuration.  By making a few changes, the alternator could be turned into a very powerful motor.  The motor had the advantage of being able to draw current from the main battery bank.  Using this method, the company’s control system would just need to activate a relay to switch the battery between the rectifier circuit and a brushless DC motor configuration.


Alternator's Wye CircuitWily Widget

Alternator’s Wye Circuit


Alternator/Motor Switching CircuitWily Widget

Alternator/Motor Switching

Hall Sensors used as FET DriversWily Widget

Hall Sensors Used as FET Drivers

List of Hobby Circuits

eMail David A. Johnson, P.E. about this circuit

DC Magazine, Issue 17, Page 7:  Battery Charging Generator Starter

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