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Torque optimization of seven phase BLDC machines in normal and degraded modes with constraints on current and voltage

Conférence invitée
Author
VU, Duc Tan
DOS SANTOS MORAES, Tiago José
ccSEMAIL, Eric
13338 Laboratoire d’Électrotechnique et d’Électronique de Puissance - ULR 2697 [L2EP]
NGUYEN, Ngac Ky

URI
http://hdl.handle.net/10985/13594
Date
2018

Abstract

This paper proposes several easy-to-implement control strategies when seven-phase axial flux brushless DC machines with trapezoidal back electromotive forces operate in normal and faulty modes by taking into account constraints on voltage and current. The constraints are related to the converter and machine design in terms of maximum values of current and voltage. The considered faults are cases in which one or two phases of the machine are open-circuited. Numerical computations based on analytical formulations are applied to obtain torque-speed characteristics, including the fluxweakening operation. The methods determine current references to ensure the torque optimizations while currents and voltages are within their limits. The usefulness of the methods is verified by numerical results.

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