Exact Multiphysics Modelling and Experimental Validation of Spoke-Type Permanent Magnet Brushless Machines

Multiphysics modelling and analysis are classic but vital problems for permanent magnet brushless (PMBL) machine design. Bulk of studies give analysis but lack modelling guidelines, comparisons, and rational validations. Accordingly, the principal objective of this article is to systematically investigate the accuracy and rationality among five proposed multiphysics models. Also, it will offer guidelines of modelling and progressive validation for in-depth PMBL machine design optimization from multidisciplinary aspects of electromagnetic, mechanical, vibration, and control. A combined mathematical modelling, finite element analysis, co-simulation, experimental coupling methodological approach is carried out. As a critical phenomenon, electromechanical vibration necessitates theoretical analysis of modified excitation forces considering inverter-side harmonics. Based on a typical spoke-type PMBL machine prototype and tests, the performances under different operation modes are verified, which serve as the prerequisite of vibration prediction. Finally, parallel comparisons between multiphysics simulation and experimental results verify the accuracy and rationality of proposed models, and a balance between model complexity and accuracy is thus presented.