Electric drive propulsion system for vehicles
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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Abstract
A combination of a combustion engine connected to operate intermittently at its point of peak efficiency for effecting recharge of an electric power drive system provides a vehicle drive system capable of 100 miles per gallon.
22 Citations
11 Claims
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1. In an electric drive propulsion system for vehicles, said system including:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An electric drive system for propelling a vehicle, which comprises:
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a battery; means for maintaining said battery in sufficiently charged condition; commutator means connected to said battery; multiphase, variable speed induction drive motor means coupled to said commutator; means for rotating said commutator means independently of said drive motor means; and means for selectively driving said commutator means independently of said drive motor means to apply variable frequency, multiphase current to said drive motor means thereby controlling the speed and torque output thereof. - View Dependent Claims (8, 9, 10)
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11. In an electric vehicle drive system of the type including a battery, means for maintaining the battery in charged condition, and an electric drive motor connected to the battery for actuation thereby, the improvement which comprises:
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said drive motor being a multiphase variable speed motor; a commutator connected between said battery and drive motor; means for rotating said commutator independently of said drive motor; and means for selectively driving said commutator independently of said drive motor such that current from said battery is converted into variable frequency multiphase current and is applied to said drive motor whereby said drive motor operates at substantially constant slip at different speeds.
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Specification