Design of a ZVS PWM inverter for a brushless DC motor in an EMA application

Abstract

Electromechanical actuators are being examined as a replacement for the hydraulic systems used in thrust vector control and propellant control valves on space vehicles. The flow of energy from the source to the load in these high power electromechanical systems is controlled via a three-phase inverter. This paper presents an investigation into and design of a zero-voltage switched three-phase inverter for utilization in an electromechanical actuator system. The operation of this inverter is described and design equations are developed. Experimental results from a 5 HP prototype are presented.<>