Motor control device in electric motor-operated vehicle
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsMitsuo Fukaya, Hiroaki Takechi, Koshi Sasaki
Life of this patent
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Abstract
An electric motor control for a series-wound DC motor for providing speed control and also for controlling regenerative braking. The regenerative braking is energized either when the accelerator pedal is released and/or when a brake pedal is depressed. In addition, the control circuit limits the total vehicle speed and brakes the vehicle if it is stopped and begins to roll due to gravity.
Claims22
An electric motor control for an electric motor driven vehicle, said motor comprising an armature and an exciter winding, a battery, a first parallel circuit comprising a first switch and a first diode connected to a first terminal of said battery, a second parallel circuit comprising a second switch and a second diode connected to a second terminal of said battery so that said parallel circuits are in series circuit with each other, and a motor control circuit including a diode bridge having one junction thereof connected to the juncture of said first and said second parallel circuits, the opposite juncture of said diode bridge being connected to one terminal of said armature winding, the other terminal of said armature winding being connected to the second terminal of said battery, an accelerator and brake control and means for selectively operating said switches to energize said armature winding from said diode bridge junctures for providing electrical power for operating said vehicle when said accelerator and brake control calls for acceleration and for selectively operating said switches so that said motor functions as a generator for charging said battery for providing regenerative braking of said vehicle when said accelerator and brake control calls for braking of the vehicle.
Dependencies are inferred from the claim text.