An international leader in power electronics technologies, Seung-Ki Sul’s innovations concerning sensorless control techniques are improving the reliability and reducing the cost of motor drive systems critical to a wide range of applications. Sul developed a sinusoidal pulsating injection method for sensorless control to realize high-performance alternating-current motor control without using a position or speed sensor even at low speeds. Sul’s methods have been commercialized and applied to motion and traction control in elevators to enable smooth starting, oil pump drives in automobiles that reduce cost and improve vehicle reliability, sensorless traction motors in electric and hybrid vehicles, and even washing machines. His recently developed sensorless drive featuring pulsating square wave voltage has important implications for traction control in humanoid robots.
An IEEE Fellow, Sul is a professor with Department of Electrical and Computer Engineering at Seoul National University, Seoul, Korea.