Electrically propelled vehicle

Details Electrically propelled vehicle Electrically propelled vehicle

B - Operations, Transporting

60

L

342/34.31

B60L 7/12 (2006.01) B60L 3/00 (2006.01) B60L 11/18 (2006.01)

Patent

CA 1063702

ABSTRACT OF THE DISCLOSURE A propulsion system for an electrical vehicle including a linear proportional controller operable in a plurality of modes for operating a d.c. drive motor via powder derived from a propulsion battery. Low speed operation is achieved in an armature control mode wherein the controller is interposed between the propulsion battery and the motor armature while the motor field is coupled directly across the battery. High speeds are attained in a field control mode wherein the controller is interposed between the battery and motor field while the armature is coupled directly across the propulsion battery, thereby eliminating controller losses from the high current armature circuit. Switching between modes is achieved in a manner which minimizes stress on the switching elements. The controller is also adapted to operate in a charger mode wherein unregulated d.c. power is fed to the controller which functions to regulate the charge provided to the battery. Overall efficiency is increased by use of a dual chopper as a powder modulator element. The circuit further includes protection means for controlling or preventing operation under conditions wherein circuit elements might be damaged.

244219

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