A multi-phase rotary machine control apparatus for controlling a power converter, which supplies drive currents to a set of coils forming a multi-phase rotary machine, the control apparatus comprising:
- a rotation angle sensor for detecting a rotation angle of a rotary shaft of the multi-phase rotary machine;
- a current detector for detecting the drive of each phase;
- and
- a control unit for feeding back each phase current detection values of the current detector and controlling voltage command values outputted to the power convertor;
- wherein
- the control unit is configured to calculate the voltage command values such that the drive currents become zero when the rotary shaft of the multi-phase rotary machine is rotated externally of the multi-phase machine, to calculate an angle error indicative of a difference between a rotation angle detection value of the rotation angle sensor and an actual rotation angle value of the rotary shaft of the multi-phase rotary machine, and to perform rotation angle correction corresponding to the angle error relative to the rotation angle detection value of the rotation angle sensor;
- and
- the control unit includes:
- a current conversion section for converting the each phase current detection value of the current detector into current detection values of a d-axis and a q-axis, which are orthogonal to each other;
- a current command value calculation section for commanding zero amperes as the current command values of the d-axis and the q-axis;
- a control calculation section for calculating the voltage command values of the d-axis and the q-axis so that the current detection values become zero ampere;
- an angle error calculation section for calculating the angle error based on the voltage command values of the d-axis and the q-axis calculated by the control calculation section;
- and
- an angle correction value memory section for storing the angle error calculated by the angle error calculation section as an angle correction value, and
- wherein the angle error calculation section is configured to calculate the angle error as Δθ=A×tan(Vd/Vq) assuming that Δθ is the angle error, and Vd and Vq are the voltage command values of the d-axis and the q-axis calculated by the control calculation section when the rotary shaft of the multi-phase rotary machine is rotated externally.