For the purpose of controlling the torque of a three phase induction motor a control system suitable to be operated by a computer is provided. A torque instruction, an angle of rotation, a flux angle, the magnitude of rotating magnetic field and suitable constants are used to produce current instructions...http://www.google.ca/patents/US4272715?utm_source=gb-gplus-sharePatent US4272715 - System for controlling torque of induction motors
