Patent ID: 9065365
Filing Date: 2015-06-23
Classification: H02P

Abstract:
1. A control device for controlling a driving state of a three-phase alternating current motor, in which a voltage to be applied to the motor is controlled by an inverter, the control device comprising: a current acquisition device for acquiring a sensor phase current sensed value in a sensor phase current sensing cycle from a current sensor disposed in a sensor phase, which is one of three phases of the alternating current motor; a rotation angle acquisition device for acquiring a rotation angle sensed value from a rotation angle sensor for sensing a rotation angle of the alternating current motor; a current command value operation device for updating a current command value relating to the driving state of the alternating current motor in a command update cycle, which is longer than the sensor phase current sensing cycle; a current estimation device for calculating a current estimated value according to the sensor phase current sensed value, the rotation angle sensed value, and the current command value; a voltage command value operation device for calculating a voltage command value according to the current command value and the current estimated value that is fed back; a drive signal generation device for generating a drive signal relating to a driving state of the inverter according to the voltage command value; and a sudden change prevention device for preventing the voltage command value from a sudden change according to a sudden change in the current estimated value that is fed back, wherein the sudden change of the current estimated value is caused by a sudden change in the current command value, wherein the sudden change of the voltage command value is defined by a change period equal to or shorter than a predetermined time interval, and a change amount equal to or larger than a predetermined change amount, wherein the sudden change of the current estimated value is defined by a change period equal to or shorter than a predetermined time interval, and a change amount equal to or larger than a predetermined change amount, and wherein the sudden change in the current command value is defined by a change period equal to or shorter than a predetermined time interval, and a change amount equal to or larger than a predetermined change amount.