Improved rotor position estimation by signal injection in brushless AC motors, accounting for cross-coupling magnetic saturation

Li, Y and Zhu, Z Q and Howe, D and Bingham, Chris and Stone, D (2007) Improved rotor position estimation by signal injection in brushless AC motors, accounting for cross-coupling magnetic saturation. In: Industry Applications Conference, 2007. 42nd IAS Annual Meeting. , 23-27 Sept 2007, New Orleans, USA.

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Improved rotor position estimation by signal injection in brushless AC motors, accounting for cross-coupling magnetic saturation
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.
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Full text URL: http://dx.doi.org/10.1109/07IAS.2007.356

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.

Item Type:Conference or Workshop Item (Presentation)
Additional Information: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:Sensorless control, Permanent Magnet AC Motor, Signal Injection
Subjects:H Engineering > H600 Electronic and Electrical Engineering
Divisions:College of Science > School of Engineering
ID Code:2461
Deposited By:INVALID USER
Deposited On:16 May 2010 15:18
Last Modified:28 Aug 2014 09:24

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