| 摘要 |
In a motor driving control device, a high-frequency alternating voltage or rotation voltage (having a frequency of omega<SUB>h</SUB>) is applied to a motor so that magnetic saturation occurs in the motor, thereby extracting, from a gamma-axis current, a high-frequency second-harmonic component (a frequency component of 2xomega<SUB>h</SUB>) that is obtained by attenuating at least a direct-current component of the gamma-axis current. The polarity checker detects the polarity of the magnetic pole of the rotor based on the difference, caused by magnetic saturation, between the positive and negative amplitudes of the high-frequency second-harmonic component.
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