Motor rotational position angle estimation method, motor rotational position angle estimation device, inverter control method, and inverter control device

摘要

PPROBLEM TO BE SOLVED: To extract the high frequency component of a physical amount efficiently while preventing occurrence of phase shift. PSOLUTION: The rotational position angle estimator A1 of a motor comprises coordinate converting sections 121 and 122, and a filtering section 123. Driving voltage of a salient pole motor 2 is superposed with high frequency voltages vSBh, /SBand vSBh, /SBof angular frequency SBh/SBhigher than the driving voltage angular frequency . The coordinate converting section 121 converts the numbers of flux interlinkage SB/SBand SB/SBbeing given in a fixed coordinate system based on the driving voltage superposed with the high frequency voltages vSBh, /SBand vSBh, /SBto obtain the numbers of flux interlinkage SBd/SBand SBq/SB. The filtering section 123 filters the numbers of flux interlinkage SBd/SBand SBq/SBobtained at the coordinate converting section 121 to remove at least its DC component thus obtaining its high frequency components SBh, d/SBand SBh, q/SB. The coordinate converting section 122 converts the high frequency components SBh, d/SBand SBh, q/SBobtained at the filtering section 123 by filtering into the fixed coordinate system thus obtaining high frequency components SBh, /SBand SBh, /SB. PCOPYRIGHT: (C)2006,JPO&NCIPI