HYBRID-VEHICLE VARIABLE-VOLTAGE TRACTION MOTOR DRIVE

摘要

A method is provided for controlling a traction motor for an electrified vehicle, wherein the motor is driven by a pulse-width modulated inverter. A drive command from a driver of the vehicle is converted into a demanded torque. A substantially fixed DC link voltage is maintained from a DC power source. An input voltage for supplying to the inverter is calculated that causes the motor to deliver the demanded torque at a transition point between a constant-torque region and a field-weakening region of torque production. The voltage from the DC link is converted to the determined input voltage at an input to the inverter. By lowering the voltage applied to the inverter, switching losses and harmonic losses are reduced.

主权项

1. A method of controlling a traction motor for an electrified vehicle, comprising the steps of:
driving an inverter with a variable duty cycle to generate a desired torque from the motor; and adjusting a DC voltage to the inverter so that torque production tracks a transition point between a constant-torque region and a field-weakening region.