Patent ID: 7906923

Claim:
A control apparatus for a reluctance type synchronous motor wherein slit-shaped gaps or a nonmagnetic material are included within a rotor to provide level differences of the magnetic reluctance in a rotating direction, and a permanent magnet is included at a portion of the slit-shaped gaps or the nonmagnetic material to provide magnetic polarities at a rotor surface, comprising: a q-axis current calculation unit which calculates a q-axis current amplitude value that is proportional to a torque command value given by a host controller; a d-axis current calculation unit which calculates a d-axis current amplitude value that is proportional to the torque command value; a speed coefficient calculation unit which calculates a q-axis current coefficient and a d-axis current coefficient that change in accordance with a rotor speed; a q-axis current compensation value calculation unit which calculates a q-axis current command value and a d-axis current command value by multiplying the q-axis current amplitude value and the q-axis current coefficient, and the d-axis current amplitude value and the d-axis current coefficient, respectively, and which calculates a q-axis current compensation value in conformity with a triangular compensation function or a trapezoidal compensation function based on the d-axis current command value; and an output unit which outputs a compensated q-axis current command value in which the calculated q-axis current compensation value is added to the q-axis current command value.