Performance of a 14. 9-kW laminated-frame dc series motor with chopper controller
Very little performance data is available for chopper controlled dc series motors as used in battery powered electric vehicles. This report presents test results obtained through experimental testing of a 14.9 kW (20 hp) traction motor using two types of excitation: ripple-free dc from a motor-generator set for baseline data and chopped dc as supplied by a battery and chopper controller. For the same average values of input voltage and current, the power output was independent of the type of excitation. However, at the same speeds, motor efficiency at low power output (corresponding to low duty cycle of the controller) was 5 to 10 percentage points less on chopped dc than on ripple-free dc. This illustrates that for chopped waveforms, it is incorrect to calculate input power as the product of average voltage and average current. Locked-rotor torque, no-load losses, and magnetic saturation data were also determined.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
- OSTI ID:
- 6202551
- Report Number(s):
- DOE/NASA/1044-79/2; NASA-TM-79177
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330300* -- Advanced Propulsion Systems-- Electric-Powered Systems
CONTROL SYSTEMS
CURRENTS
DATA
DATA FORMS
DIRECT CURRENT
ELECTRIC CURRENTS
ELECTRIC MOTORS
ELECTRIC-POWERED VEHICLES
EXPERIMENTAL DATA
GRAPHS
INFORMATION
MOTORS
NUMERICAL DATA
PERFORMANCE
SPECIFICATIONS
TABLES
VEHICLES