| 主权项 |
1. A control device of a three phase alternating current motor having an applied voltage, which is controlled by an inverter, the control device controlling a drive of the motor, the control device comprising:
a current acquisition device for acquiring a current sensed value from a current sensor, which is disposed on a sensor phase of the motor that is one of three phases of the motor; a rotation angle acquisition device for acquiring a rotation angle sensed value from a rotation angle sensor, which senses a rotation angle of the motor; a current estimation device for operating a current estimated value according to the current sensed value and the rotation angle sensed value; a first voltage command value operation device for operating a first voltage command value according to a current command value, which relates to the drive of the motor, and the current estimated value to be fed back; a voltage command reference value operation device for operating a voltage command reference value using a theoretical formula of an electric motor according to the current command value; a second voltage command value operation device for correcting the voltage command reference value in order to operate a second voltage command value; a control mode switching device for switching between a first control mode, for generating a drive signal relating to a drive of the inverter based on the first voltage command value, and a second control mode, for generating the drive signal based on the second voltage command value; and a number-of-revolutions operation device for operating the number of revolutions of the motor according to the rotation angle sensed value, wherein, when the number of revolutions is more than a predetermined determination threshold value, the control mode switching device selects the first control mode, and wherein, when the number of revolutions is not more than the predetermined determination threshold value, the control mode switching device selects the second control mode. |
