Quasi-3D analytical modeling of the magnetic field of an axial flux permanent magnet synchronous machine

Azzouzi, J.; Barakat, Georges; Dakyo, Brayima

doi:10.1109/iemdc.2003.1210717

Cited by 18 publications

(11 citation statements)

References 10 publications

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“…The coefficient of magnet-to-magnet end leakage flux can be defined as (19) where Φ po , Φ pi and Φ m are the outer magnet-to-magnet end leakage flux, inner magnet-to-magnet end leakage flux and the main flux, respectively. The coefficient of magnet-to-rotor end leakage flux can be defined as…”

Section: Leakage Coefficients and Radial Coefficients Of End Leakage mentioning

confidence: 99%

Analysis of end effect in ironless stator AFPM machine via MEC model

Gao

Zhang

Wang

et al. 2019

IET Electric Power Applications

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The Halbach-array permanent magnet (PM) rotors can achieve higher air-gap flux density due to magnetic flux gathering effect, which contributes to the higher-torque density improvement of the ironless stator axial flux PM (AFPM) machine. However, the end leakage fluxes of the ironless stator AFPM machine are serious due to the large magnetic resistance of the main flux loop in ironless stator machines. Circular arc straight line permeance model is adopted to calculate magnet-to-magnet and magnet-to-rotor end leakage fluxes based on the analysis of the relationship between end leakage fluxes and coils. A magnetic equivalent circuit (MEC) model is established considering end leakage fluxes. The leakage coefficients representing the ratio of end leakage fluxes to main flux and radial coefficients representing effective radial lengths of end leakage fluxes are analysed via the MEC model. The coefficients vary with machine parameters including PM thickness, rotor yoke thickness and air-gap length. On the basis of the analysis results, the influence factors of end leakage fluxes are summarised and the 50 kW ironless stator AFPM machine is optimised. Finally, a 50 kW ironless stator AFPM machine with Halbach-array PM rotors is prototyped to verify the results of the finite element analysis and MEC model.

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Section: Leakage Coefficients and Radial Coefficients Of End Leakage mentioning

confidence: 99%

Analysis of end effect in ironless stator AFPM machine via MEC model

Gao

Zhang

Wang

et al. 2019

IET Electric Power Applications

View full text Add to dashboard Cite

show abstract

“…2 shows the rotor structure. The value of the flux-density has been evaluated by Finite Elements, both in 2D by cutting the machine with cylindrical surfaces with different radiuses (this technique is often referenced as quasi-3D mode [21] [22]) and has been validated in 3D mode. The waveform of the flux-density is a distinctive feature, as the semi period of the first harmonic is five times the pole pitch.…”

Section: Outlines On Machine Constructionmentioning

confidence: 99%

A Fractional Slot Axial Flux PM Direct Drive

Marignetti

Colli

Cancelliere

et al. 2005

IEEE International Conference on Electric Machines and Drives, 2005.

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The paper deals with an Axial-Flux PM Synchronous Motor (AFPMSM) for a direct wheel drive. Its main feature is the armature winding of the fractional slots type. The choice of a concentrated non-overlapping winding allows a large number of pole pairs to be designed. The paper is aimed at emphasizing the special features of the whole motor drive. Therefore, both machine and control design aspects are targeted. Encoder-less operation of the drive is particularly critical. A vector control scheme is illustrated. A sliding-mode rotor flux estimation scheme is investigated. Its performances are experimentally compared to the encoder operation.Index Terms-Axial flux motor, permanent magnet, design, fractional slot windings, sensorless control.0-7803-8987-5/05/$20.00 ©2005 IEEE.

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“…Analytical approaches have been attended as alternatives with more simplicity and less solution time, but limited accuracy. For example, analytical predictions of the air-gap flux density, no-load torque ripples, and back electromotive force (EMF) have been already regarded for AFPM machines [2][3][4][5][6][7][8][9][10][11]. Such researches are not comprehensive, as they have disregarded the full-load machine operation.…”

Section: Introductionmentioning

confidence: 99%

Detailed analytical method for predicting the steady‐state time variations and entire harmonic contents of principal performance characteristics in a non‐slotted axial flux permanent magnet motor, considering a precise iron loss model

Baghayipour

Darabi

Dastfan

2017

IET Electric Power Applications

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The harmonic contents of principal performance characteristics in an electrical machine are important due to several reasons, especially because they influence the machine acoustic noise generation capability. Therefore, they should be accurately calculated considering the various electromagnetic effects involved in the machine operation. Accordingly, this study proposes a detailed analytical model for predicting the time waveforms and harmonic contents of the principal performance characteristics of a double-sided TORUS-type non-slotted axial flux permanent magnet motor with surface-mounted magnets at steady state under any given loading conditions. The armature-reaction magnetic field and inductances are exactly calculated considering both the effects of coil sides and end windings as well as that of the winding distribution. Most notably, the aggregate iron loss of machine and its influence on armature currents is precisely modelled based on the magnetic field distribution in iron parts. By establishing and solving the differential equation system of motor in the two cases with or without the neutral wire, the armature currents, speed and torque ripples, input/output powers, and copper and iron losses are all achieved with the entire harmonic content and highest accuracy. The comparison of results with those of finite element analysis and real test then validates the model.

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Quasi-3D analytical modeling of the magnetic field of an axial flux permanent magnet synchronous machine

Cited by 18 publications

References 10 publications

Analysis of end effect in ironless stator AFPM machine via MEC model

Analysis of end effect in ironless stator AFPM machine via MEC model

A Fractional Slot Axial Flux PM Direct Drive

Detailed analytical method for predicting the steady‐state time variations and entire harmonic contents of principal performance characteristics in a non‐slotted axial flux permanent magnet motor, considering a precise iron loss model

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