To enable correct calculation of a magnetic pole position by applying a high-frequency current of a proper magnitude when applying a high-frequency alternating voltage to a permanent magnet type synchronous motor.
The controller is provided with: a d-axis high frequency current control means having a bandpass filter 24 for detecting the amplitudes of a and -axis high-frequency currents; a Fourier series calculator 31 for detecting a component pulsing at 180 cycle of an electric angle from the -axis high-frequency current amplitude and detecting the amplitude of a d-axis high-frequency current; a high-frequency current adjuster 32 for calculating a first -axis high-frequency voltage amplitude command value Vh** so that the detected value of the d-axis high-frequency current amplitude may match the d-axis high-frequency current amplitude command value; and a control constant calculator 33 for calculating a second -axis high frequency voltage amplitude command value Vh* for calculating a high frequency voltage to be applied to the electric motor 80 from the first -axis high-frequency voltage amplitude command value Vh** and calculating an angle error calculating gain Kerr from a ripple component of the detected value of the -axis high-frequency current amplitude.
MATSUMOTO YASUSHI
ITOIGAWA NOBUO
| JPH10323099A | 1998-12-04 | |||
| JP2007060899A | 2007-03-08 | |||
| JP2007124835A | 2007-05-17 |
Next Patent: CONTROLLER OF PERMANENT MAGNET TYPE SYNCHRONIZATION ELECTRIC MOTOR