Magnet shape optimization of A slotted surface-mounted axial gap PM motor for reducing cogging torque

Yolaçan, Ersin; Özyurt, Emre; Aydın, Metin

doi:10.1109/icelmach.2010.5608012

Cited by 7 publications

(7 citation statements)

References 9 publications

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“…3.1.1. Magnet skewing Magnet skewing is an effective method to reduce cogging torque of AFPM machines by reducing high-order back-electromotive force (EMF) harmonics [15,16]. It is easy to skew magnets in AFPM machines because of the simple permanent magnet geometry.…”

Section: Influence Of Parameters On Cogging Torquementioning

confidence: 99%

Cogging Torque Computation and Optimization in Dual‐Stator Axial Flux Permanent Magnet Machines

Zhang

Liu

2020

IEEJ Transactions Elec Engng

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Combining Schwarz–Christoffel transformation, magnetic field reconstruction method, and Maxwell stress tensor method, the calculation model of cogging torque of a dual‐stator axial flux permanent magnet machine is established. The end effect and slotting effect are both been taken into account. The results are verified by finite element method. And with the proposed method, calculation time can be significantly reduced compared with finite element method. Three measures to reduce the cogging torque of dual‐stator axial flux permanent magnet machines are discussed based on which the cogging torque is optimized by genetic algorithm. © 2020 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

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Section: Influence Of Parameters On Cogging Torquementioning

confidence: 99%

Cogging Torque Computation and Optimization in Dual‐Stator Axial Flux Permanent Magnet Machines

Zhang

Liu

2020

IEEJ Transactions Elec Engng

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“…However, it can be performed easily in the AFPM motors because of their flat magnet surface and simple magnet geometry. Magnet skew in the AFPM motors can be accomplished by a few different means such as conventional skew, triangular skew, parallel-sided skew, trapezoidal skew, circular skew and dual-magnet skew [20].…”

Section: Effect Of the Magnet Skew In The Cogging Torque Reductionmentioning

confidence: 99%

“…Some of these techniques are skewing the magnets or slots, displacing and shaping the magnets, adding slots or teeth, optimising the magnet pole-arc-to-pole-pitch ratio, employing a fractional number of slots per pole, magnet/pole shifting and rotor displacement. Most of these methods can be applied to axial flux PM motors [17][18][19][20]. However, the topic of magnet or pole shifting is investigated for the RFPM motors [15,16,[21][22][23] with less detail and has not been thoroughly investigated for the AFPM motors in the earlier studies.…”

Section: Introductionmentioning

confidence: 99%

Magnet asymmetry in reduction of cogging torque for integer slot axial flux permanent magnet motors

Güleç

Aydın

2014

IET Electric Power Applications

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Cogging torque component is one of the key issues in the design of radial and axial gap permanent magnet motors and the geometry and the position of the magnets plays a critical role in this process. This study presents the influence of magnet asymmetry in minimisation of the cogging torque for axial flux permanent magnet (AFPM) disc motors. Cogging torque minimisation techniques, such as magnet skewing and magnet shifting or groping are examined in detail by using threedimensional finite element analysis with various types of magnet skewing alternatives since the shaping and the positioning magnets are low cost approaches to minimise or eliminate the cogging component. A prototype AFPM disc motor is built with shifted magnets based on the models which are the results validated with the experimental results for the minimum cogging component and the sinusoidal back-EMF waveform. It is shown in this study that the cogging component in AFPM motors can be practically eliminated by using magnet asymmetry and perfectly sinusoidal back-EMF can also be obtained even for integer slot/pole/phase motors.

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“…However, the torque ripple level is of concern in lowspeed in-wheel applications. The torque ripple is of special concern at low speed operation, since the system inertia greatly filters out the pulsations of the torque at high speed operation [5].…”

Section: Introductionmentioning

confidence: 99%

Magnet shape influence on the performance of AFPMM with demagnetization

Saavedra

Riba

Romeral

2013

IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society

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Abstract-In this paper the effect of the magnets shape on the AFPMM performance under a demagnetization fault has been analyzed by means of 3D-FEM simulations. Demagnetization faults in permanent magnet synchronous motors (PMSMs) may generate specific fault harmonic frequencies in the stator currents, output torque and the zero-sequence voltage component (ZSVC) spectra the ones can affect motor behavior, and so these parameters have been studied and compared, for each magnet configuration in each condition. These analyses are carried out to find out the more suitable geometry for an operation under healthy and faulty condition.

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Magnet shape optimization of A slotted surface-mounted axial gap PM motor for reducing cogging torque

Cited by 7 publications

References 9 publications

Cogging Torque Computation and Optimization in Dual‐Stator Axial Flux Permanent Magnet Machines

Cogging Torque Computation and Optimization in Dual‐Stator Axial Flux Permanent Magnet Machines

Magnet asymmetry in reduction of cogging torque for integer slot axial flux permanent magnet motors

Magnet shape influence on the performance of AFPMM with demagnetization

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