A drive system for an electric vehicle includes a motor for providing a drive torque and an electrically actuated brake for providing a braking torque to the motor. The system includes a controller that receives a plurality of inputs which may include a battery voltage input, a throttle pedal position...http://www.google.com/patents/US7332881?utm_source=gb-gplus-sharePatent US7332881 - AC drive system for electrically operated vehicle
