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New generalized D‐state observers for sensorless drive of permanent‐magnet synchronous motors. Impact of rotor flux harmonics to fundamental component estimate
Author(s) -
Shinnaka Shinji
Publication year - 2009
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.20768
Subject(s) - harmonics , control theory (sociology) , rotor (electric) , observer (physics) , magnet , harmonic analysis , state (computer science) , component (thermodynamics) , magnetic flux , engineering , computer science , physics , electronic engineering , algorithm , electrical engineering , magnetic field , voltage , control (management) , quantum mechanics , artificial intelligence , thermodynamics
This paper proposes new generalized D‐state observers as new minimum‐order flux state observers for sensorless drive of permanent‐magnet synchronous motors. The proposed generalized D‐state observers, which are established by a new approach using filters in the D‐module, contain the conventional D‐state observer as a special case, and the associated observer gain also contains the conventional one for the conventional D‐state observer as a special case. Consequently, the proposed generalized D‐state observers provide designers with a higher degree of design flexibility. In addition, for generalized D‐state observers, this paper presents a new analysis of the error in estimation of the rotor flux fundamental component due to rotor flux harmonics originating from nonsinusoidal magnetization, which has hitherto been an unsolved problem. It is analytically shown and verified by numerical experiments that harmonics appear in the flux estimate in a similar manner to the original rotor flux harmonics from the viewpoint of rotor phase error. © 2009 Wiley Periodicals, Inc. Electr Eng Jpn, 169(2): 37–47, 2009; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20768