Junction temperature reduction of a power semiconductor module in a three phase inverter

摘要

Provided is a motor controller and method of controlling a motor with an improved maximum junction temperature rating. In accordance with one aspect of the present invention, a motor is controlled by varying (48) a common mode voltage duty ratio (60) for a plurality of solid state switching devices (22) in a power inverter (60), generating (52) drive signals for the solid state switching devices (22) based at least in part upon the common mode voltage duty ratio (60), and changing states of the solid state switching devices (22) based upon the drive signals.