INDUCTION MOTOR DRIVE SYSTEM

PROBLEM TO BE SOLVED: To provide an induction motor drive system for identifying magnetic saturation characteristics, in a state with an induction motor made to be stationary. SOLUTION: The induction motor drive system has an inverter 1, converting a DC power supplied from a DC power supply 3 into an AC power and driving the induction motor 4. The DC voltage is applied to the induction motor 4 from the inverter 1. A magnetic flux estimating part 15 stores a D-axis current final value IdF, after setting a D-axis current Id flowing in the induction motor 4, stores time-series data Id[κ] of D-axis current Id flowing in the induction motor 4 and operates an estimation magnetic flux amount h, based on a D-axis current final value IdF and time-series data Id[κ] of D-axis current Id. A magnetic saturation characteristic computing part 16 identifies the magnetic saturation characteristics by magnetic saturation characteristics. COPYRIGHT: (C)2010,JPO&INPIT