Modeling and sensorless direct torque and flux control of a dual-airgap axial flux permanent-magnet machine with field-weakening operation

Nguyen, Trong Duy, Foo, Gilbert, Tseng, King-Jet, & Vilathgamuwa, D. Mahinda (2013) Modeling and sensorless direct torque and flux control of a dual-airgap axial flux permanent-magnet machine with field-weakening operation. IEEE/ASME Transactions on Mechatronics, 19(2), pp. 412-422.

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This paper presents the modeling and motion-sensorless direct torque and flux control of a novel dual-airgap axial-flux permanent-magnet machine optimized for use in flywheel energy storage system (FESS) applications. Independent closed-loop torque and stator flux regulation are performed in the stator flux ( x-y) reference frame via two PI controllers. This facilitates fast torque dynamics, which is critical as far as energy charging/discharging in the FESS is concerned. As FESS applications demand high-speed operation, a new field-weakening algorithm is proposed in this paper. Flux weakening is achieved autonomously once the y-axis voltage exceeds the available inverter voltage. An inherently speed sensorless stator flux observer immune to stator resistance variations and dc-offset effects is also proposed for accurate flux and speed estimation. The proposed observer eliminates the rotary encoder, which in turn reduces the overall weight and cost of the system while improving its reliability. The effectiveness of the proposed control scheme has been verified by simulations and experiments on a machine prototype.

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6 citations in Web of Science®

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ID Code: 72233
Item Type: Journal Article
Refereed: Yes
Keywords: Axial-flux permanent-magnet (AFPM) machine, Field-weakening operation, Flywheel energy storage system (FESS), Sensorless direct torque and flux control (DTFC)
DOI: 10.1109/TMECH.2013.2242481
ISSN: 1941-014X
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 Institute of Electrical and Electronics Engineers
Deposited On: 29 May 2014 22:24
Last Modified: 01 Jun 2014 22:02

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