Analysis of AFPM machines with cylindrically shaped magnets using quasi-3D method

2017 ◽  
Vol 36 (4) ◽  
pp. 1168-1183
Author(s):  
Naghi Rostami ◽  
Majid Rostami
Keyword(s):  
Density Distribution ◽  
Flux Density ◽  
Design Methodology ◽  
Potential Drop ◽  
Axial Flux ◽  
Content Type ◽  
Saturation Coefficient ◽  
Slot Opening ◽  
Leakage Coefficient ◽  
Flux Density Distribution

Purpose The purpose of this paper is the fast and accurate modelling of surface-mounted Axial-Flux Permanent-Magnet (AFPM) machines equipped with cylindrical magnets using quasi-3D approach. Furthermore, the accuracy of the method is improved by using leakage coefficient, saturation coefficient and an appropriate permeance function. Design/methodology/approach Quasi-3D approach is used for fast and accurate modelling of AFPM machines. Air-gap flux density distribution, induced back EMF, and produced cogging torque are calculated using the proposed method with reasonable accuracy. Findings The results obtained by quasi-3D approach compared to Finite-Element-Analyses (FEA) shows how accurate, fast and efficient this method is. It is proved that, this method can be successfully applied to evaluate the performance of the AFPM machines. Originality/value Effectiveness and accuracy of quasi-3D approach is assessed on different AFPM machines. Furthermore, to increase the accuracy of computations, the effects of the magnetic potential drop at iron parts of the machine are taken into account by using a saturation coefficient. Besides, the influence of the slot opening on the flux density distribution is taken into account by using an appropriate relative permeance function.

Mechanical stress distribution and the utilisation of the magneto-elastic effect in electrical machines

2019 ◽  
Vol 38 (4) ◽  
pp. 1085-1097
Author(s):  
Jan Karthaus ◽  
Benedikt Groschup ◽  
Robin Krüger ◽  
Kay Hameyer
Keyword(s):  
Stress Distribution ◽  
Magnetic Flux ◽  
Density Distribution ◽  
Mechanical Stress ◽  
Flux Density ◽  
Electrical Machines ◽  
Magnetic Flux Density ◽  
Content Type ◽  
Elastic Effect ◽  
Flux Density Distribution

Purpose Due to the increasing amount of high power density high-speed electrical machines, a detailed understanding of the consequences for the machine’s operational behaviour and efficiency is necessary. Magnetic materials are prone to mechanical stress. Therefore, this paper aims to study the relation between the local mechanical stress distribution and magnetic properties such as magnetic flux density and iron losses. Design/methodology/approach In this paper, different approaches for equivalent mechanical stress criteria are analysed with focus on their applicability in electrical machines. Resulting machine characteristics such as magnetic flux density distribution or iron are compared. Findings The study shows a strong influence on the magnetic flux density distribution when considering the magneto-elastic effect for all analysed models. The influence on the iron loss is smaller due to a high amount of stress-independent eddy current loss component. Originality/value The understanding of the influence of mechanical stress on dimensions of electrical machines is important to obtain an accurate machine design. In this paper, the discussion on different equivalent stress approaches allows a new perspective for considering the magneto-elastic effect.

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