Electrically propelled vehicle

Patent · Tue Feb 15 04:00:00 EST 1977

OSTI ID:7123077

Christianson, C C; Bourke, R F

A propulsion system for an electrical vehicle includes a linear proportional controller operable in a plurality of modes for operating a dc drive motor via power 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 dc 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 power modulator element. The circuit further includes protection means for controlling or preventing operation under conditions wherein circuit elements might be damaged.

• Assignee: Gould Inc.
• Patent Number(s): US 4008423
• OSTI ID: 7123077
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
250904 -- Energy Storage-- Batteries-- Other Applications
33 ADVANCED PROPULSION SYSTEMS
330300* -- Advanced Propulsion Systems-- Electric-Powered Systems
CONTROL EQUIPMENT
DESIGN
ELECTRIC BATTERIES
ELECTRIC CONTROLLERS
ELECTRIC MOTORS
ELECTRIC-POWERED VEHICLES
ELECTROCHEMICAL CELLS
ELECTRONIC CIRCUITS
ENERGY STORAGE SYSTEMS
EQUIPMENT
EQUIPMENT PROTECTION DEVICES
MOTORS
SWITCHING CIRCUITS
VEHICLES