Patent ID: 8022659
Filing Date: 2011-09-20
Classification: B60L,H02P,Y02T

Abstract:
1. A control apparatus for an AC rotary machine, wherein the AC rotary machine is controlled on the basis of a secondary-magnetic-flux command value, comprising: a variable-voltage variable-frequency inverter which converts a DC into an AC of any desired frequency, and which exchanges electric power between it and the AC rotary machine; voltage detection means for detecting voltage information of a DC side of said variable-voltage variable-frequency inverter; current detection means for detecting current information items of an AC side of said variable-voltage variable-frequency inverter; inverter-electric-power command means for determining an inverter-electric-power command value which is a command value of the electric power to be converted by said variable-voltage variable-frequency inverter, in accordance with the voltage information which said voltage detection means detects; actual-inverter-electric-power calculation means for calculating an actual inverter-electric-power value which is the electric power converted by said variable-voltage variable-frequency inverter, on the basis of the current information items which said current detection means detect; secondary-magnetic-flux command calculation means for calculating the secondary-magnetic-flux command value for the AC rotary machine, on the basis of a difference between the inverter-electric-power command value and the actual inverter-electric-power value; predetermined-secondary-magnetic-flux command means for outputting a predetermined secondary-magnetic-flux command value for the AC rotary machine; and secondary-magnetic-flux command changeover means for selecting either of the secondary-magnetic-flux command value from said secondary-magnetic-flux command calculation means and the predetermined secondary-magnetic-flux command value from said predetermined-secondary-magnetic-flux command means, as the secondary-magnetic-flux command value which is used for controlling the AC rotary machine through said variable-voltage variable-frequency inverter.