Patent ID: 6194865
Filing Date: 2001-02-27
Classification: B60L,H02P,Y02T

Abstract:
A control apparatus for controlling an electric rotary machine which is connected to a battery via a power converter, comprising: a D.C. input voltage detecting means for detecting a D.C. input voltage of said power converter, a current and rotational speed detecting means for detecting a 3-phase alternating current and the rotational speed of said electric rotary machine, a dq-axis current command generating means for generating dq-axis current commands of said electric rotary machine including operation commands to control the output of said electric rotary machine according to input signals, a dq-axis voltage correction value calculating means for calculating a dq-axis voltage correction value from said dq-axis current command and a dq-axis current detection value of said electric rotary machine, a 3-phase A.C. voltage command value generating means for generating a 3-phase A.C. voltage command value from said dq-axis voltage correction value and phases of said electric rotary machine, and a PWM control means for outputting a PWM signal to drive said power converter from said A.C. voltage command value,wherein said dq-axis current command generating means includes a maximum impression voltage calculating means for generating the maximum impression voltage of said power converter from said D.C. input voltage value, a permissible maximum voltage calculating means for calculating a permissible maximum voltage by subtracting a preset value from said maximum impression voltage, and a dq-axis current command calculating means for calculating a dq-axis current command to increase the efficiency of said electric rotary machine and said power converter from said input signal and said rotational speed of said electric rotary machine under conditions wherein the terminal voltage of said electric rotary machine is below said permissible maximum voltage.