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Excitation shifting: A general low-cost solution for eliminating ultra-low-frequency torque ripple in switched reluctance machines

Nasirian, V ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1109/TMAG.2013.2251651
  3. Publisher: 2013
  4. Abstract:
  5. Switched reluctance machines (SRMs) suffer from ultra-low-frequency torque ripple in single pulse mode. This ripple is the result of an imbalance in phase currents, when multiphase excitation occurs. This paper investigates the origin of this imbalance and identifies the imbalanced phase. Excitation shifting strategy, which delays excitation of the imbalanced phase, is then proposed. The delay angle adjusts current amplitude in the imbalanced phase to attain a perfect balance between all phases. The excitation shifting strategy is a general solution, which is applicable to both three-phase and four-phase machines. In addition, the proposed method can be implemented by a much simpler drive structure, when compared to the existing balancing methods. Hardware measurements are provided to verify superior performance of the proposed current balancing technique
  6. Keywords:
  7. Finite element analysis ; Multiphase excitation ; Switched reluctance machine ; Current amplitude ; Current balancing ; Drive structures ; General solutions ; Low-cost solution ; Shifting strategy ; Single-pulse mode ; Electrical engineering ; Finite element method ; Magnetic materials ; Switching systems
  8. Source: IEEE Transactions on Magnetics ; Volume 49, Issue 9 , Sept , 2013 , Pages 5135-5149 ; 00189464 (ISSN)
  9. URL: http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=6476022&url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel7%2F20%2F6584009%2F06476022.pdf%3Farnumber%3D6476022