Patent ID: 9515583
Filing Date: 2016-12-06
CPC Classification: B60L,H02P,Y02T

Claim Text:
1. A rotary electric machine control system comprising: a measurement device that measures number of revolutions per predetermined time period of a rotary electric machine; and a threshold changing unit configured to change a control switching threshold to be used for switching a control mode of the rotary electric machine to another control mode of the rotary electric machine, in accordance with a measurement result of the number of revolutions when the measured number of revolutions has increased by a preset slip value or more, wherein the control switching threshold is a control switching phase on a d-q plane having a d-axis and a q-axis intersecting orthogonally with each other, on which an operating point of the rotary electric machine moves, wherein the control switching phase is used for switching the control mode of the rotary electric machine from a rectangular-wave control mode to an over-modulation control mode; the threshold changing unit is configured to change the control switching phase to be used for switching the control mode of the rotary electric machine from the rectangular-wave control mode to the over-modulation control mode, in accordance with the measurement result of the number of revolutions; the threshold changing unit is configured to change the control switching phase to a sudden-change switching phase that is on a smaller angle side of a current command line drawn by connecting current commands when operation of the rotary electric machine is instructed by current control, and that is on a larger angle side of an initial switching phase, in accordance with a variation in the number of revolutions when the measured number of revolutions has increased by the preset slip value or more; and the threshold changing unit is configured to set the control switching phase to the initial switching phase when the measured number of revolutions has not increased by the preset slip value or more, wherein the initial switching phase corresponds to a phase value a, and the sudden-change switching phase corresponds to one of a plurality of phase values including values b, c, and d, and wherein a is greater than b, b is greater than c, and c is greater than d, wherein a, b, c, and d are angles that correspond to variation in the numbers of revolutions.