Effects of Manufacturing Imperfections in Concentrated Coil Axial Flux PM Machines: Evaluation and Tests

Gerlando, A. Di; Foglia, G.; Iacchetti, Matteo F.; Perini, R.

doi:10.1109/tie.2013.2274427

Cited by 31 publications

(23 citation statements)

References 23 publications

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“…A group of armature currents matching different sliding distance are carefully chosen based on Equations (1), (10) and (12) to keep the power as constant as possible. The armature root mean square (RMS) current above base speed is shown in Table 2.…”

Section: Combination Of Mechanical Methods and Electrical Methodsmentioning

confidence: 99%

“…Axial flux permanent-magnet synchronous machines (PMSMs) are becoming more and more attractive in many propulsion applications due to the advantages of high efficiency, power factor and power density [9][10][11][12][13][14][15][16]. Undoubtedly, they are also very suitable to propel EVs [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…12   (20) According to Equations (17) and (18), the speed difference between speed increasing and speed decreasing is:…”

mentioning

confidence: 99%

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Research on an Axial Flux PMSM with Radially Sliding Permanent Magnets

Zhao

2015

Energies

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Axial flux permanent-magnet synchronous machines (PMSMs) are very suitable candidates for the power train of electric vehicles (EVs) due to high power density and high efficiency. This paper researches an axial flux PMSM with radially sliding permanent magnets (PMs) to fulfill field-weakening control. The field weakening principle and the structure of this kind of axial flux PMSM by mechanical method of sliding PMs are proposed and analyzed. The influences of radially sliding PMs on magnetic flux density distribution, inductance, flux linkage and torque are analyzed and discussed based on 3D finite element method (FEM). The field weakening capabilities by mechanical method and electrical method are compared. The field weakening capability of the machine can be much improved by the optimized combination of the two methods, which is very satisfying for EV drive application. The forces on the PMs are analyzed and calculated. The hysteretic characteristics caused by the friction of the PMs are investigated, which provide useful reference for designing this kind of machine.

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Section: Combination Of Mechanical Methods and Electrical Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Research on an Axial Flux PMSM with Radially Sliding Permanent Magnets

Zhao

2015

Energies

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“…However, due to the smaller contact surface between the rotor and the shaft, AFPMM becomes more difficult to design a rotor-shaft mechanical joint with high mechanical integrity [6]. This makes it predisposed to imperfect assemblies for manufacturing aspect, such as static/dynamic angular eccentricities [7], static/dynamic axis eccentricities [8], and other assembly imperfections which are combined or mixed with these eccentricities [9].…”

Section: Introductionmentioning

confidence: 99%

Analytical modeling of axial flux PM machines with eccentricities

Huang

Guo

et al. 2017

JAE

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Abstract:In this paper, an analytical quasi three-dimensional method is used to model an axial flux permanent magnet (AFPM) machine with various eccentricities. AFPM machines (AFPMMs) have various advantages but they are sensitive to geometrical imperfections for manufacturing aspect. The main aim of this paper is to propose a general analytical model to analyze the AFPMMs with various types of eccentricities. The radial and tangential magnetic flux densities in the air gap under healthy condition are obtained via combination of Maxwell's equations and Schwarz-Christoffel (SC) mapping firstly. Next, in order to investigate the eccentricities, equations for air gap length and radii are deduced. The back electromotive force (EMF) is calculated and compared with those from healthy condition and finite element (FE) analysis, respectively. The results show that the analytical predictions agree well with the FE results. Moreover, using this method has a significantly less time consuming than the 3D FM simulation process, which is a great advantage of this method. Finally, the analytical model is verified via experimental results.

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“…Static eccentricity changed the amplitude of back electromotive force (EMF) and it was proposed to use EMF curve for fault detection during manufacturing and assembling. The air-gap asymmetry arisen from offset or inclination in an inner-stator double outer-rotor AF machine is studied in [9,[17][18][19]. In [9] relevant mechanical stresses due to the electromagnetic attraction between the stator and the rotor parts due to slight air-gap asymmetries were analyzed based a simplified 2D rectified geometry using a circuit model.…”

Section: Introductionmentioning

confidence: 99%

Effect of unbalanced and inclined air-gap in double-stator inner-rotor axial flux permanent magnet machine

Cho

2014

2014 International Conference on Electrical Machines (ICEM)

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Due to its novelty in structure, the appealing force between rotor and stator disks, axial flux (AF) permanent magnet (PM) machine are easily affected by air-gap asymmetries. In the inner-rotor double-stator AF machine, the rotor disk is assembled between two outer stators. It is usually assumed that the air-gap clearance is ideal condition in electromagnetic analysis. However, manufacturing imperfections in the machine or any perturbation to rotor disk during operation would results in an unbalanced and inclined air-gap clearance, which would generate unbalanced force acting on the structure and further increase the asymmetry extent. Cogging torque, which is imperative requirements for high performance applications, is directly related to modulating effect of the air-gap and slot opening permeance. In this paper, the cogging torque under un-normal air-gap condition of AF machines is first calculated using a combined analytical and numerical methods, followed by a structure analysis to study the effect to mechanical stress, deformation and bending force on bearings. Results and conclusions given in this paper are instructive for successful development of AFPM machines.Index Terms--Axial flux permanent magnet machine (AFPM), unbalanced air-gap, inclined air-gap, cogging torque, magnetic force, deformation 978-1-4799-4389-0/14/$31.00 ©2014 IEEE

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Effects of Manufacturing Imperfections in Concentrated Coil Axial Flux PM Machines: Evaluation and Tests

Cited by 31 publications

References 23 publications

Research on an Axial Flux PMSM with Radially Sliding Permanent Magnets

Research on an Axial Flux PMSM with Radially Sliding Permanent Magnets

Analytical modeling of axial flux PM machines with eccentricities

Effect of unbalanced and inclined air-gap in double-stator inner-rotor axial flux permanent magnet machine

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