| 摘要 |
<P>PROBLEM TO BE SOLVED: To estimate the initial magnetic pole position precisely. <P>SOLUTION: In the method for estimating the initial magnetic pole position of a sensorless salient pole brushless DC motor 10, an α-axis voltage command value v<SB>α</SB>and a β-axis voltage command value v<SB>β</SB>by high-frequency wave on the αβ coordinates forming a static orthogonal coordinate system are given to the driver 11 of the motor 10, an AC current supplied to the motor 10 from the driver 11 is detected as the α-axis current i<SB>α</SB>and β-axis current i<SB>β</SB>on the αβ coordinates, a current amplitude difference Δi between the amplitudes of the α-axis current i<SB>α</SB>and β-axis current i<SB>β</SB>is calculated, the α-axis voltage command value v<SB>α</SB>and β-axis voltage command value v<SB>β</SB>being output to the driver 11 are subject to feedback control to eliminate the current amplitude difference Δi, and the initial magnetic pole position θ is calculated after the current amplitude difference Δi is eliminated. <P>COPYRIGHT: (C)2009,JPO&INPIT |
