Patent ID: 8269437
Filing Date: 2012-09-18
Classification: B60L,H02P,Y02T

Abstract:
1. A rotary electric machine control system for controlling a rotary electric machine according a vector control, which uses a d-q plane defined by a d-axis indicating a d-axis current and a q-axis indicating a q-axis current and orthogonal to the d-axis, the control system comprising: mode switching means for switching over a control mode among a sinusoidal wave current control mode, an overmodulation current control mode and a rectangular wave voltage phase control mode; first current command means for performing a first current command in the overmodulation current control mode based on a maximum efficiency characteristic line when the control mode is switched over from the sinusoidal wave current control mode to the overmodulation current control mode, the maximum efficiency characteristic line being formed by connection of pairs of the d-axis current and the q-axis current on the d-q plane, and each pair corresponding to an operation point at which a rotary electric machine operates at a maximum efficiency; and second current command means for performing a second current command in the overmodulation current control mode based on a switching line different from the maximum efficiency characteristic line for a predetermined period after the control mode is switched over from the rectangular wave voltage control mode to the overmodulation current control mode, wherein the switching line is formed by connection of pairs of the d-axis current and the q-axis current on the d-q plane and provided on a retard angle side relative to the maximum efficiency characteristic line, the retard angle side being in a clockwise direction from the maximum efficiency characteristic line towards the q-axis on the d-q plane.