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JEET, Vol. 13, No. 6, November 2018 
A Coupled Recursive Total Least SquaresBased Online Parameter Estimation for PMSM
Shen Xu 
Area 
B  Electric Machinery and Power Electronics 
Abstract 
A coupled recursive total least squares (CRTLS) algorithm is proposed for parameter
estimation of permanent magnet synchronous machines (PMSMs). TLS considers the errors of both
input variables and output ones, and thus achieves more accurate estimates than standard least squares
method does. The proposed algorithm consists of two recursive total least squares (RTLS) algorithms
for the daxis subsystem and qaxis subsystem respectively. The incremental singular value
decomposition (SVD) for the RTLS obtained by an approximate calculation with less computation.
The performance of the CRTLS is demonstrated by simulation and experimental results. 
Keyword 
Online parameter estimation,Permanent magnet synchronous machine (PMSM),Total least squares (TLS),Singular value decomposition (SVD).

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