Improved Rotor Position Estimation by Signal Injection in Brushless AC Motors, Accounting for Cross-Coupling Magnetic Saturation

Author

Li, Y. ; Zhu, Z.Q. ; Howe, D. ; Bingham, C.M. ; Stone, D.

Author_Institution

Univ. of Sheffield, Sheffield

fYear

2007

Firstpage

2357

Lastpage

2364

Abstract

The paper presents an improved signal injection- based sensorless control method for permanent magnet brushless AC (BLAC) motors, accounting for the influence of cross-coupling magnetic saturation between the d- and q-axes. The d- and q-axis incremental self-inductances, the incremental mutual-inductance between the (d-axis and q-axis, and the cross-coupling factor are determined by finite element analysis. A method is also proposed for measuring the cross-coupling factor which can be used directly in the sensorless control scheme. Both measurements and predictions show that a significant improvement in the accuracy of the rotor position estimation can be achieved under both dynamic and steady-state operation, compared with that which is obtained with the conventional signal injection method.

Keywords

AC motors; brushless machines; finite element analysis; machine control; permanent magnet motors; position measurement; rotors; cross-coupling factor; cross-coupling magnetic saturation; finite element analysis; permanent magnet BLAC motors; permanent magnet brushless AC motors; rotor position estimation; sensorless control method; signal injection method; AC motors; Brushless motors; Finite element methods; Magnetic analysis; Permanent magnet motors; Position measurement; Rotors; Saturation magnetization; Sensorless control; Steady-state;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Conference, 2007. 42nd IAS Annual Meeting. Conference Record of the 2007 IEEE

Conference_Location

New Orleans, LA

ISSN

0197-2618

Print_ISBN

978-1-4244-1259-4

Electronic_ISBN

0197-2618

Type

conf

DOI

10.1109/07IAS.2007.356

Filename

4348105