| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide such control as hardly affected by estimation error of a position angle, for stable rotation control of a motor, with a small size. <P>SOLUTION: As inverse saliency grows, a rotational angular speed ω increases, and a main magnetic flux Ψ<SB>a</SB>relative to a radius V<SB>o</SB>of a voltage limit circle increases, the effect of fluctuation of a position angle on a phase angle δ of voltage vector becomes smaller. In short, as the oval of current locus becomes flatter toward d-axis, the oval becomes smaller, and its center comes away from the original point, the effect of fluctuation of the position angle on the phase angle of the voltage vector decreases. So, for a motor that uses a rotor comprising a permanent magnet, especially a motor with large inverse saliency such as a brushless DC motor of embedded permanent magnet type, in such high speed operation as sagging control is performed, the voltage phase angle δ is hardly affected by the position angle error of the rotor. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
