| 摘要 |
PROBLEM TO BE SOLVED: To control a torque current or an effective current continuously up to a state where voltage is saturated, and to output the torque current or the effective current up to near a maximum value.SOLUTION: A deviation between a current command of a first axis that is a power supply voltage axis direction or a direction orthogonal to a rotor magnetic flux axis of a motor, and a current of the first axis is integrated while being limited within a range of ±90°, thereby computing a voltage phase command. Such a first axis voltage command as to satisfy a current command of a second axis that is an axis orthogonal to the first axis is computed and on a first-axis/second-axis plane, a line connecting a straight line where the first axis voltage command is fixed and a line closer to an origin in a maximum voltage circle of a power converter is defined as an operation line. A voltage command vector at a point satisfying the voltage phase command on the operation line is outputted, and in accordance with a result of transforming the voltage command vector into stationary coordinates, the power converter outputs an AC voltage. |
