Open AccessInfluence of rotor cage resistance in torque ripple reduction for line start synchronous machines
Author(s) -
Ganesan Aswin Uvaraj,
Chokkalingam Lenin Natesan
Publication year - 2019
Publication title -
iet electric power applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.815
H-Index - 97
eISSN - 1751-8679
pISSN - 1751-8660
DOI - 10.1049/iet-epa.2018.5783
Subject(s) - torque ripple , rotor (electric) , switched reluctance motor , squirrel cage rotor , finite element method , torque , ripple , harmonics , wound rotor motor , synchronous motor , control theory (sociology) , engineering , materials science , direct torque control , structural engineering , voltage , computer science , induction motor , mechanical engineering , physics , electrical engineering , artificial intelligence , thermodynamics , control (management)
The interaction of spatial harmonics of electrical loading and the rotor anisotropy causes torque ripple in line start synchronous reluctance motor (a type of synchronous motor). A novel design technique for torque ripple reduction is presented in this study. Initially, synchronous reluctance motor filled with conducting material inside the flux barrier (called cage barrier) is optimised using a genetic algorithm (GA) technique. The optimised design is further verified using finite element analysis (FEA) and tested. To reduce the ripple content, the rotor has been introduced with an additional d ‐axis cage. Six rotor structures with an additional cage have been designed and optimised using FEA. The numerical analysis results are compared for all rotor structures. The optimised rotor structures with and without d ‐axis cage are fabricated and tested. Experimental results reveal that the fabricated rotor with an additional cage has reduced torque ripple and high efficiency. Finally, the acoustics test is carried out for both the fabricated structures and results are compared.