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

Güleç, Mehmet; Aydın, Metin

doi:10.1049/iet-epa.2013.0256

Cited by 35 publications

(24 citation statements)

References 24 publications

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“…Line voltage and output power have been increased by taking into account the losses in this transformation. Furthermore, the parameter of cogging torque becomes greatly more of an issue in especially low-speed wind turbine applications and electric power steering systems [27,28]. Reducing the cogging torque helps to reduce torque ripple, mechanical vibration and acoustic noise [29].…”

Section: General Considerations For Pmsgmentioning

confidence: 99%

Transient analysis with coupled field-circuit model and experimental assessment of a PMSG used in small-scale wind turbine for water heating purpose

et al. 2019

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This paper introduces the detailed coupled field-circuit analysis including performance characteristics of a 4-kW in-running rotor permanent magnet synchronous generator (PMSG) used in rural-type small-scale wind turbines for water heating purpose. The content of the work consists of design, analysis, optimization, production and testing processes and validation studies. An integrated 2D electromagnetic field and circuit model are used in the design and analysis processes. The electrical machine design involves complex and time-consuming processes. This model provides comprehensive information on machine behavior under different conditions and is an effective to demonstrate compliance with real load conditions prior to the manufacture. The goal of the optimization process is to find a design that offers cost, manufacturability and efficiency as well as generator output values. For this, a multiobjective optimization approach has been used. Typical design and simulation principles are applied to the designed PMSG, respectively, including calculation and evaluation of various output parameters for different simulated wind speed rates and varying load conditions. Furthermore, the analytical studies related to finite element methods and parametric approaches are presented in collaboration with experimental studies carried out for different load rates.

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Section: General Considerations For Pmsgmentioning

confidence: 99%

Transient analysis with coupled field-circuit model and experimental assessment of a PMSG used in small-scale wind turbine for water heating purpose

et al. 2019

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“…The more the uniform air-gap flux density distribution, the less the cogging torque level is created in the machine. The saturated stator teeth leads to a more uniform air-gap flux density and thus results in a reduced cogging torque [28].…”

Section: Principles Of the Cogging Torquementioning

confidence: 99%

Cogging torque reduction in axial-flux permanent magnet wind generators with yokeless and segmented armature by radially segmented and peripherally shifted magnet pieces

Arand

Ardebili

2016

Renewable Energy

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a b s t r a c tThe inherent cogging torque component of the PM generators can cause problems at the start-up of wind turbines. To improve the operation of wind turbines, especially at low starting speeds, the wind generator cogging torque should be minimized. In this paper, an effective and practical approach is proposed for cogging torque reduction in the AFPM generators with yokeless and segmented armature (YASA). The proposed approach is based on the dividing magnets radially and shifting the magnet pieces peripherally with an appropriate shifting angle. Using a series of 3-D FEA simulations, the proposed approach is compared with the two conventional approaches, i.e. the magnet skewing approach and the selecting an appropriate magnet pole arc to pole pitch ratio, according to the cogging torque reduction and the negative impacts on the generator loadability. It is shown that using the proposed approach, the generator cogging torque can be greatly reduced (about 87%). Also, it is shown that compared with the other studied cogging torque reduction techniques, the proposed approach has less negative impact on the generator loadability. Some of the simulation results are verified using the experimental tests.

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“…The first caused by stator slotting and the next caused by PMs. There are several techniques of cogging thrust minimisation in PM motors, such as optimal shaping of slots or PMs [13][14][15][16][17], skewing of slots or PMs [16][17][18][19], and use of modular PMs [20]. Some of these techniques lead to an increase in the manufacturing cost of the machine; others result in a decrease in the average thrust.…”

Section: Introductionmentioning

confidence: 99%

Cogging force mitigation techniques in a modular linear permanent magnet motor

Tootoonchian

Nasiri‐Gheidari²

2016

IET Electric Power Applications

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Modular linear doubly salient permanent magnet motors are well adapted to linear propulsion systems because of their distinct characteristics, such as high efficiency and power density, reduced maintenance and initial cost, low noise and permanent magnet (PM) leakage flux, and fault tolerance capability. However, such motors suffer from high cogging thrust. In this study, various techniques based on previously proposed methods for PM machines are applied on the studied motor and evaluated by using non-linear three-dimensional time-stepping finite element analysis; three novel, optimised techniques are then presented. The techniques presented are based on the minimisation of the variation in air-gap reluctance relative to the displacement. The PM volume and average air-gap length are kept constant in all optimisations. Since the average thrust and thrust ripples under load condition may be affected by cogging reduction techniques, these values are presented for all given techniques. The results show that the proposed techniques not only maintained the average thrust under various loads but also significantly suppressed the thrust ripples for different average thrusts and cogging forces.

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

Cited by 35 publications

References 24 publications

Transient analysis with coupled field-circuit model and experimental assessment of a PMSG used in small-scale wind turbine for water heating purpose

Transient analysis with coupled field-circuit model and experimental assessment of a PMSG used in small-scale wind turbine for water heating purpose

Cogging torque reduction in axial-flux permanent magnet wind generators with yokeless and segmented armature by radially segmented and peripherally shifted magnet pieces

Cogging force mitigation techniques in a modular linear permanent magnet motor

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