Performance of a 14. 9-kW laminated-frame dc series motor with chopper controller

Technical Report · Fri Jun 01 00:00:00 EDT 1979

OSTI ID:6202551

Schwab, J R

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
• DOE Contract Number: EC-77-A-31-1044
• OSTI ID: 6202551
• Report Number(s): DOE/NASA/1044-79/2; NASA-TM-79177
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
ELECTRIC MOTORS
PERFORMANCE
ELECTRIC-POWERED VEHICLES
CONTROL SYSTEMS
DIRECT CURRENT
EXPERIMENTAL DATA
GRAPHS
SPECIFICATIONS
TABLES
CURRENTS
DATA
DATA FORMS
ELECTRIC CURRENTS
INFORMATION
MOTORS
NUMERICAL DATA
VEHICLES
330300* - Advanced Propulsion Systems- Electric-Powered Systems