A program is underway to develop an advanced DC motor controller for use on electric vehicles. This program has now completed the first phase where a functional model was designed, fabricated, and tested. A follow-on phase will extend the development to improve and expand the system in preparation for field tests. The system under development is a self-contained, high efficiency, high frequency, pulse-width-modulated motor controller which is low in weight and cost. Its design reduces audible noise and extends battery life by reduction of battery and motor ripple currents.