Electric motor drive with infinitely variable speed transmission
First Claim
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1. A variable speed drive for motor vehicles and the like characterized by having an output shaft with high torque requirements at low speeds of operation, the combination comprising:
- an electric motor drive;
infinitely variable speed transmission means having an input driven by said motor drive and an output coupled to a vehicle to be driven, said infinitely variable speed transmission means including a movable control member shiftable to vary the speed ratio between the input and output of said transmission means over a predetermined range of speed ratios;
speed ratio control means operatively coupled to said movable control member, said control means movable in response to rotation of said motor drive to vary the ratio of the output speed and torque at the output side of said transmission with respect to the input speed and torque; and
resistance compensator means for imposing a predetermined resistance to movement of said control means whereby to control the speed ratio between the input side and the output side of said infinitely variable speed transmission, the maximum output speed of said transmission means being matched to the most efficient operating speed of said electric motor drive.
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Abstract
A drive system adapted for use in motor vehicles comprises an infinitely variable speed drive transmission coupled to a DC motor, and the speed ratio of the transmission is controlled by a speed-responsive flyweight or governor so as to maintain the DC motor at its most efficient operating level.
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Citations
18 Claims
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1. A variable speed drive for motor vehicles and the like characterized by having an output shaft with high torque requirements at low speeds of operation, the combination comprising:
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an electric motor drive; infinitely variable speed transmission means having an input driven by said motor drive and an output coupled to a vehicle to be driven, said infinitely variable speed transmission means including a movable control member shiftable to vary the speed ratio between the input and output of said transmission means over a predetermined range of speed ratios; speed ratio control means operatively coupled to said movable control member, said control means movable in response to rotation of said motor drive to vary the ratio of the output speed and torque at the output side of said transmission with respect to the input speed and torque; and resistance compensator means for imposing a predetermined resistance to movement of said control means whereby to control the speed ratio between the input side and the output side of said infinitely variable speed transmission, the maximum output speed of said transmission means being matched to the most efficient operating speed of said electric motor drive. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A variable speed drive for high inertial loads characterized by having an output shaft with high torque requirements at low speeds of operation and relatively low torque requirements at high speeds of operation, the combination comprising:
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a DC motor drive including a control circuit and a plurality of batteries connected in series; power transmission means drivingly connected to said motor drive; infinitely variable speed transmission means having an input member driven by said power transmission means and an output member coupled to a load to be driven, said infinitely variable speed transmission means including a movable control member shiftable to vary the speed ratio between the input and output members of said infinitely variable speed transmission means over a predetermined range; flyball governor means operatively coupled to the input member of said infinitely variable speed transmission means, said flyball governor means including flyweights movable radially outwardly in response to increasing speeds of rotation of said power transmission means to vary the ratio of the output speed and torque at the output side of said infinitely variable speed transmission means with respect to the input speed and torque from said power transmission means; and regulator means for imposing a predetermined resistance to outward radial movement of said flyweights whereby to control the acceleration and speed at the output side of said infinitely variable speed transmission for a given acceleration and speed of said motor drive. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification