VORRICHTUNG ZUR VEKTORREGELUNG FUER EINEN INDUKTIONSMOTOR.

摘要

A vector control apparatus for an induction motor controls rotation of the induction motor by the respective phase current command values calculated on the basis of a torque command and a secondary flux command and includes a memory means (22) for storing a function representing a predetermined relation between a rotation speed, a torque and a second flux of the induction motor and for outputting a secondary flux corresponding to given rotation speed and torque data, and a means (1, 19) for supplying at least torque data to the memory means (22). The function is set such that a loss is reduced in a high-load operation of the induction motor and a variation in rotation speed of the induction motor is reduced in low-load operation.