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Electric drive propulsion system for vehicles

  • US 4,318,449 A
  • Filed: 11/09/1978
  • Issued: 03/09/1982
  • Est. Priority Date: 12/12/1977
  • Status: Expired due to Term
First Claim
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1. In an electric drive propulsion system for vehicles, said system including:

  • a variable speed main drive motor;

    a power reservoir battery to energize the drive motor for powering the vehicle;

    a battery charging system comprised of means including a charging engine operable independently of the drive motor for electrically charging the battery and control means responsive to the charge state of the battery to energize the charging engine intermittently for operation at substantially optimum efficiency conditions;

    a commutator connected between the battery and the drive motor for receiving electrical power from said battery and producing a variable frequency alternating current for powering said drive motor; and

    means independent of said drive motor for rotating said commutator, the rate of rotation of said commutator determining the frequency of said alternating current provided to said drive motor.

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