Open AccessReduction of torque ripple in a wound‐rotor brushless doubly‐fed machine by using the tooth notching
Author(s) -
Ou Lezhi,
Wang Xuefan,
Xiong Fei,
Ye Caiyong
Publication year - 2018
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.2017.0683
Subject(s) - torque ripple , notching , stator , torque , rotor (electric) , control theory (sociology) , magnet , ripple , finite element method , engineering , wound rotor motor , direct torque control , computer science , mechanical engineering , physics , voltage , electrical engineering , induction motor , structural engineering , control (management) , artificial intelligence , thermodynamics
The torque ripple is a main source of the noise and vibration which has a considerable effect on the performance of the machine. A design technique, tooth notching, which was extensively used in permanent magnet machines, has been innovatively applied to a wound‐rotor brushless doubly‐fed machine (BDFM) to reduce the torque ripple. First of all, the winding structure, the winding space harmonics and magnetic fields of the stator and the rotor were studied. Then, general analytical expressions of the electromagnetic torque (EMT) for the BDFM were deduced. Finally, prediction of the results was verified by several models which were calculated by the finite‐element analysis method, meanwhile, the influences of different tooth‐notching structures and the notch depth on the EMT were investigated. It is shown that the torque ripple can be reduced by the suggested design with small increment of the magnetic field saturation and the currents of the control winding and the rotor winding.