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The performance and efficiency of four motor/controller/battery systems for the simpler electric vehiclesA test and analysis program performed on four complete propulsion systems for an urban electric vehicle (EV) is described and results given. A dc series motor and a permanent magnet (PM) motor were tested, each powered by an EV battery pack and controlled by (1) a series/parallel voltage-switching (V-switch) system; and (2) a system using a pulse width modulation, 400 Hz transistorized chopper. Dynamometer tests were first performed, followed by eV performance predictions and data correlating road tests. During dynamometer tests using chopper control; current, voltage, and power were measured on both the battery and motor sides of the chopper, using three types of instrumentation. Conventional dc instruments provided adequate accuracy for eV power and energy measurements, when used on the battery side of the controller. When using the chopper controller, the addition of a small choke inductor improved system efficiency in the lower duty cycle range (some 8% increase at 50% duty cycle) with both types of motors. Overall system efficiency rankings during road tests were: (1) series motor with V-switch; (2) PM motor with V-switch; (3) series motor with chopper; and (4) PM motor with chopper. Chopper control of the eV was smoother and required less driver skill than V-switch control.
Document ID
19800016057
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Shipps, P. R. (Three E Vehicles San Diego, CA, United States)
Date Acquired
September 4, 2013
Publication Date
May 1, 1980
Subject Category
Electronics And Electrical Engineering
Report/Patent Number
NASA-CR-159776
DOE/NASA/0130-80/1
Accession Number
80N24550
Funding Number(s)
CONTRACT_GRANT: DEN3-130
CONTRACT_GRANT: EC-77-A-31-1044
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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