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

This 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 i...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2009, Vol.45 (5), p.1843-1850
Main Authors: Yi Li, Zhu, Z.Q., Howe, D., Bingham, C.M., Stone, D.A.
Format: Article
Language:English
Subjects:
A C motors
AC motors
Accounting
Brushless ac (BLAC) motor
Brushless motors
cross-coupling effect
Inductance
Induction motors
Industry Applications Society
Magnetic analysis
Magnetic saturation
Mathematical analysis
Motors
Permanent magnet motors
Rotors
Saturation (magnetic)
Saturation magnetization
sensorless
signal injection
Voltage
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Summary:This 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. An experimental method is 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.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2009.2027518