Patent ID: 6281659
Filing Date: 2001-08-28
Classification: H02P

Abstract:
A control system performing a vector control of an induction motor using a speed sensor, comprising:a first reference point setting unit setting a point P.sub.R at an arbitrary position on a stator current vector plane;a first vector transforming unit transforming a measured and observed values of a stator current of the induction motor into vectors starting from the point P.sub.R on the stator current vector plane;a magnitude calculating unit obtaining difference between magnitudes of the vectors transformed by said first vector transforming unit for the measured and observed values;a phase difference calculating unit obtaining a difference between phases of the vectors transformed by said first vector transforming unit for the measured and observed values;a first rotor resistance estimating unit estimating a rotor resistance of the induction motor from the difference between magnitudes; anda stator resistance estimating unit estimating a stator resistance of the induction motor from the difference between phases.