Control apparatus for AC motor
AssigneeDenso Corporation
InventorsRyuji Omata, Takeshi Itoh, Hirofumi Kako
Life of this patent
Estimating the term…
Abstract
In a motor control apparatus for controlling an AC motor with an inverter, a current estimation value is calculated based on a current detection value of one phase of the motor and a rotation angle of the motor. A difference between a current command value related to driving of the AC motor and the current estimation value is calculated. A first voltage command value used to generate a drive signal related to driving of the inverter is calculated based on the difference. A sign of the difference is reversed at a reverse interval when the rotation speed is not greater than a determination threshold.
Claims10
A control apparatus for controlling a three-phase AC motor to which a voltage controlled by an inverter is applied, the control apparatus comprising:
- a current receiver configured to receive a current detection value from a current sensor provided to one of three phases of the AC motor;
- a rotation angle receiver configured to receive a rotation angle detection value from a rotation angle sensor that detects a rotation angle of the AC motor;
- a rotation speed calculator configured to calculate a rotation speed of the AC motor based on the rotation angle detection value;
- a current estimator configured to calculate a current estimation value based on the current detection value and the rotation angle detection value;
- a difference calculator configured to calculate a difference between a current command value related to driving of the AC motor and the feedback current estimation value;
- a first voltage command value calculator configured to calculate a first voltage command value based on the difference, the first voltage command value used to generate a drive signal related to driving of the inverter, and
- a difference reverser configured to reverse a sign of the difference at a reverse interval when the rotation speed is not greater than a first determination threshold.
Dependencies are inferred from the claim text.