Title :
Improved Rotor Position Estimation in Extended Back-EMF Based Sensorless PM Brushless AC Drives with Magnetic Saliency
Author :
Li, Y. ; Zhu, Z.Q. ; Howe, D. ; Bingham, C.M.
Author_Institution :
Univ. of Sheffield, Sheffield
Abstract :
An improved extended back-EMF based sensorless control method is proposed for a brushless AC motor equipped with an interior permanent magnet rotor. It accounts for dq-axis cross-coupling magnetic saturation by introducing an apparent mutual winding inductance. The error which results in the estimated rotor position when the influence of cross-coupling magnetic saturation is neglected is analyzed analytically, predicted by finite element analysis, and confirmed experimentally, for various d- and q-axis currents. It is shown that a significant improvement in the accuracy of the rotor position estimation can be achieved by the proposed method, as confirmed by measurements.
Keywords :
AC motor drives; brushless machines; electric potential; finite element analysis; permanent magnet motors; rotors; back-EMF; brushless AC motor; cross-coupling magnetic saturation; finite element analysis; interior permanent magnet rotor; magnetic saliency; rotor position estimation; sensorless PM brushless AC drives; winding inductance; AC motors; Finite element methods; Inductance; Integrated circuit modeling; Magnetic analysis; Permanent magnets; Rotors; Saturation magnetization; Sensorless control; Voltage;
Conference_Titel :
Electric Machines & Drives Conference, 2007. IEMDC '07. IEEE International
Conference_Location :
Antalya
Print_ISBN :
1-4244-0742-7
Electronic_ISBN :
1-4244-0743-5
DOI :
10.1109/IEMDC.2007.383579
