Title :
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
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;
Conference_Titel :
Industry Applications Conference, 2007. 42nd IAS Annual Meeting. Conference Record of the 2007 IEEE
Conference_Location :
New Orleans, LA
Print_ISBN :
978-1-4244-1259-4
Electronic_ISBN :
0197-2618
DOI :
10.1109/07IAS.2007.356
