Patent ID: 9276517
Filing Date: 2016-03-01
CPC Classification: H02P

Claim Text:
1. A control device of a three phase alternating current motor comprising: an inverter for driving the motor; a current sensor for sensing current flowing in a sensor phase of the motor, which is one of three phases of the motor; and a controller for switching on and off a plurality of switching elements, which provide the inverter, so that the controller controls the current flowing through the motor, wherein the controller includes: wherein the current concentration is a state, in which current not less than a predetermined threshold value flows continuously for a predetermined period in one or more phases of the inverter, and wherein the controller further includes: wherein, when a state, in which at least one of the current sensed value of the sensor phase and the two current estimated values of the two phases is more than a predetermined current determination threshold value, continues for a predetermined determination period, the current concentration determination device determines that the current concentration is caused.