CPC H02P 21/16 (2016.02) [H02P 21/22 (2016.02)]  17 Claims 
1. A motor inductance measurement comprising:
an energization control circuitry to perform energization control of the motor such that an AC voltage is applied to at least one axis on twoaxis orthogonal rotation coordinates of the motor to cause the AC current to flow; and
an inductance calculation circuitry to generate the characteristic of the instantaneous value of the AC magnetic flux corresponding to the instantaneous value of the AC current as the inductance information by calculating the instantaneous value of the AC magnetic flux by integrating a residual voltage which is obtained by subtracting a resistance voltage from the AC voltage, the resistance voltage being obtained from the AC current of the motor based on a detection current detected from the motor, and from resistances of the motor, wherein
the inductance calculation circuitry includes a magnetic flux calculation circuitry that calculates the AC magnetic flux having a first shape in a characteristic with respect to the AC current and generates first magnetic flux data that is the characteristic of the instantaneous value of the AC current corresponding to the instantaneous value of the AC magnetic flux, and an information conversion circuitry that converts the first magnetic flux data into second magnetic flux data having a second shape using a resistance type parameter, and
the inductance calculation circuitry generates the second magnetic flux data and the resistance type parameter at a time of the second magnetic flux data that is generated, as the inductance information.
