NDLI: Analytical modelling of the effect of pole offset on the output parameters of BLDC motor

Content Provider	IET Digital Library
Author	Jafarboland, Mehrdad Sargazi, Mostafa Miri
Abstract	In this study, a new analytical model is provided to calculate the effect of the pole offset on the output parameters of brushless DC (BLDC) motor. The proposed model is based on the two-dimensional analysis model and the direct solution of Laplace and Cauchy–Poisson equations for the magnetic field in the air gap and the magnets area. In this model, radial and tangential components of the magnetisation vector are calculated. Effect of pole offset on the radial and tangential components of magnetisation vector is derived. It is shown that in the case of a motor with pole offset although the length of the magnet decreases at the edges of the pole, the effective air-gap length remains constant. This study proposed two coefficients to model the reduced thickness of the magnets at the edges of the poles. Therefore, the flux density is calculated in the air gap and motor magnets. Based on the proposed model, effect of pole offset on the cogging torque ripple and back-electromotive force is achieved. These results are compared with the results of finite element and experimental tests and accuracy of the model is presented.
Starting Page	666
Ending Page	676
Page Count	11
ISSN	17518660
Volume Number	12
e-ISSN	17518679
Issue Number	Issue 5, May (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-epa/12/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-epa.2017.0703
Journal	IET Electric Power Applications
Publisher Date	2018-03-02
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Air Gap Back-electromotive Force BLDC Motor Brushless DC Motor Cauchy-Poisson Equation Cogging Torque Ripple D.C. Machines Differential Equation (numerical Analysis) Finite Element Analysis Flux Density Calculation Laplace Equation Linear Algebra Machine Insulation Magnetic Flux Magnetisation Vector Calculation Numerical Analysis Poisson Equation Pole Offset Effect Two-dimensional Analysis Model Vector
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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