Featured is a controller for a motor that is ultra-compact, with a power density of at least about 20 watts per cubic cm (W/cm3). The controller utilizes a common ground for power circuitry, which energizes the windings of the motor, and the signal circuitry, which controls this energization responsive...http://www.google.ca/patents/US7511443?utm_source=gb-gplus-sharePatent US7511443 - Ultra-compact, high-performance motor controller and method of using same
