As the inverters and motors for electric vehicles are designed based on the powering performance, the motor torque in the middle and high-speed ranges is smaller than that in the low-speed range. So the brake force in the high-speed range mainly depends on the mechanical brake. This design method realizes downsized, lightweight and low-cost inverters and motors, though at higher maintenance costs. So we studied the methods to insert capacitance or rheostats between inverter and traction induction motor, in order to increase the electric brake force, and confirmed the effect of the method to insert rheostats through plant-test.

Copyright (c) 2001 Railway Technical Research Institute