The need to drive high-power electric motors at high rotational speeds is increasing and cuts across virtually all industries. Many applications require very high rotational speeds, in tens of thousands of rpm, in confined spaces. Specific applications are aerospace, oil and gas drilling, high-speed fans and ventilators, gas turbines, and fly wheels. Majority of these applications also have high-power demand in hundreds of kW. Existing IGBT-based drives cannot achieve the base frequencies required to drive such motors at sufficient speed. In high-power scenarios, IGBT switching frequencies are typically limited to 3–8 kHz, which in turn limits the base operating frequency to hundreds of Hz. The conventional drives typically use gearboxes to mechanically achieve high-speed operation. Using gearboxes causes a significant reduction in both reliability and efficiency and increases size and cost. In any electromechanical system, gearboxes tend to be the least reliable element due to significant stress in steady state and transient operations. These stresses are largely magnified and high-speed and high-power applications.