Electric powertrain system having bidirectional DC generator

  • US 7,812,555 B2
  • Filed: 04/30/2007
  • Issued: 10/12/2010
  • Est. Priority Date: 04/30/2007
  • Status: Expired due to Fees
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First Claim
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1. An electric powertrain for use with an engine and a traction device, comprising:

  • a DC motor/generator operable to;

    receive at least a portion of a first mechanical output from the engine and produce a DC power output; and

    receive DC power and produce a second mechanical output;

    a drivetrain operable to;

    receive the DC power output and use the DC power output to drive the traction device; and

    generate DC power when the traction device is operated in a dynamic braking mode;

    an AC alternator operable to receive a portion of the first mechanical output and produce an AC power output; and

    a rectifier coupled with the AC alternator, the rectifier being operable to convert the AC power output to a DC power output combinable with the DC power output of the DC motor/generator, wherein;

    the engine is rated to produce a first amount of mechanical power and to receive a second amount of mechanical power, the second amount of mechanical power being less than the first amount of mechanical power;

    the DC motor/generator is sized based on the second amount of mechanical power; and

    the AC alternator is sized based on a difference between the first and second amounts of mechanical power.

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