Patent ID: 8981688
Filing Date: 2015-03-17
Classification: H02P

Abstract:
1. A control device for a three-phase alternate current motor, the control device comprising: an inverter having a plurality of switching elements for driving the three-phase alternate current motor; a plurality of current sensors, each of which senses a current passing through a respective phase among three phases of the alternate current motor; and a control means that has a feedback control operation part for operating a voltage command of each phase so as to converge a deviation between a current sensed value sensed by a respective current sensor and a current command value of a respective phase to be zero and that switches on and off each switching element based on the voltage command of each phase so as to control the current passing through a respective phase of the alternate current motor, wherein, when an absolute value of a sum of the current sensed values of three phases is larger than a predetermined three-phase sum threshold value, the control means: