| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the need for amplitude adjustment of high frequency voltage superposed on a synchronous motor for magnetic pole position detection.SOLUTION: A controller for controlling with a power converter by estimating the magnetic pole position of a permanent magnet synchronous motor includes: an adder-subtracter 22 for generating a γ-axis voltage command value by adding a γ-axis high frequency voltage command value to a γ-axis basic wave voltage command value; bandpass filters 33a, 33b for detecting a γ-axis high frequency current amplitude and a δ-axis high frequency current amplitude, respectively, from a γ-axis current detection value and a δ-axis current detection value: a current adjuster 31 for operating a γ-axis high frequency voltage amplitude command value so as to match the γ-axis high frequency current amplitude with a γ-axis high frequency current amplitude command value: a rectangular wave oscillator 32 for operating a γ-axis high frequency current voltage command value from a γ-axis high frequency voltage amplitude command value; an angular difference computing unit 34 for computing a magnetic pole position from the δ-axis high frequency current amplitude; a speed computing unit 35; and an integrator 36. |
