Open AccessAnalytical model and optimisation design of surface‐mounted PM motors with Halbach arrays accounting for semi‐closed slots
Author(s) -
Jing Libing,
Gong Jun
Publication year - 2020
Publication title -
iet electric power applications
Language(s) - English
Resource type - Journals
ISSN - 1751-8679
DOI - 10.1049/iet-epa.2019.1038
Subject(s) - cogging torque , counter electromotive force , halbach array , magnet , rotor (electric) , electromotive force , torque , air gap (plumbing) , magnetic field , finite element method , control theory (sociology) , mechanical engineering , engineering , automotive engineering , computer science , electrical engineering , physics , materials science , electromagnetic coil , structural engineering , control (management) , quantum mechanics , artificial intelligence , composite material , thermodynamics
In this study, an analytical model is proposed to calculate the magnetic field and electromagnetic torque (including cogging torque) in the surface‐mounted permanent‐magnet (SMPM) machines with Halbach arrays accounting for semi‐closed slots. The analytical model can be used to calculate both no load and load air gap magnetic field of SMPM. The permanent magnets (PMs) on the rotor are arranged Halbach array and each pole is divided into four segments. Additionally, in order to improve the performance of the SMPM, the analytical model is combined with genetic algorithm to optimise some parameters of the motor. The analytical results from the proposed model have been compared with those issued from finite‐element method. Finally, the 12‐slot/8‐pole motor is manufactured and the back‐electromotive force, iron loss and load characteristics are validated by experiments.