Bonded magnets for brushless fractional machines: Process parameters effects evaluation

Ferraris, Luca; Pošković, Emir

doi:10.1109/iecon.2013.6699546

Cited by 18 publications

(7 citation statements)

References 30 publications

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“…They require a simpler and less expensive process and no special protective treatment [9]. They can also be made in complex forms using injection or compression molding technologies [9]. NdFeB bonded magnets have better performance [11], but are more expensive than ferrites, while they are often a good alternative to NdFeB sintered magnets.…”

Section: A Overview On Bonded Magnets and Soft Magnetic Composites (mentioning

confidence: 99%

“…Bonded magnets could be an alternative [8], [9], [10]: different percentages of plastic binder allow to "tune" the resulting magnetic characteristic, moving in a wide range. They require a simpler and less expensive process and no special protective treatment [9]. They can also be made in complex forms using injection or compression molding technologies [9].…”

Section: A Overview On Bonded Magnets and Soft Magnetic Composites (mentioning

confidence: 99%

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Hybrid magnetic composite (HMC) materials for sensor applications

Ferraris

Franchini

Pošković

2016

2016 IEEE Sensors Applications Symposium (SAS)

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Several applications adopt electromagnetic sensors, that base their principle on the presence of magnets realized with specific magnetic materials that show a rather high remanence, but low coercivity. This work concerns the production, analysis and characterization of hybrid composite materials, with the use of metal powders, which aim to reach those specific properties. In order to obtain the best coercivity and remanence characteristics various "recipes" have been used with different percentages of soft and hard magnetic materials, bonded together by a plastic binder. The goal was to find out the interdependence between the magnetic powder composition and the characteristics of the final material. Soft magnetic material (special Fe powder) has been used to obtain a low coercivity value, while hard materials were primarily used for maintaining a good induction remanence; by increasing the soft proportion a higher magnetic permeability has been also obtained. All the selected materials have been characterized and then tested; in order to verify the validity of the proposed materials two practical tests have been performed. Special magnets have been realized for a comparison with original ones (AlNiCo and ferrite) for two experimental cases: the first is consisting in an encoder realized through a toothed wheel, the second regards the special system used for the electric guitars.

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Section: A Overview On Bonded Magnets and Soft Magnetic Composites (mentioning

confidence: 99%

Section: A Overview On Bonded Magnets and Soft Magnetic Composites (mentioning

confidence: 99%

Hybrid magnetic composite (HMC) materials for sensor applications

Ferraris

Franchini

Pošković

2016

2016 IEEE Sensors Applications Symposium (SAS)

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“…The analysis is carried out also considering the process simplification 17 in terms of mechanical pressure 19,20 to be applied on the mold and in terms of post pressure thermal treatment 21 ; economic aspects 22 are marginally considered at this stage of the research activity, but are anyhow presented as an interesting evaluating factor. In the paper several SMC productions are considered, using different percentages of plastic binder and different compaction pressures.…”

Section: Goal Of the Workmentioning

confidence: 99%

“…In the present research activity the attention has been focused on the most suitable resin to be adopted; the opportunity to work together with the plastic research group operating in the Alessandria campus of Politecnico di Torino has made possible to select few resins in the very wide panorama. 14,17 In particular are here presented the SMCs realized with phenolic resins, well known and widely adopted in the realization of metallic compounds, particularly in the field of the car brakes, testifying high resistance to mechanical stress. The proposed mixture of powder is easy to manufacture 17 and doesn't require a dedicated process as spraying or resin bath, but just a good mixing operation, and doesn't require long and particular heat treatments at high temperatures: 150…”

Section: Goal Of the Workmentioning

confidence: 99%

New Soft Magnetic Composites for electromagnetic applications with improved mechanical properties

2016

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The chance to move from 2D to 3D approach in the design of the electrical machines is made possible by the availability of Soft Magnetic Composites (SMC), iron based powders, insulated and pressed to realize shapes otherwise impossible with the traditional lamination sheets technology. Some commercial products are available on the market as “ready to press” powders, which presents good magnetic and energetic properties but are sometimes weak under the mechanical point of view; other products aim at improving this aspect but with considerable process complications and relative cost. The experience of the Authors in the realization of bonded magnets with the adoption of selected organic resins has been partly transferred in the research field of the SMC in order to investigate the possibility to obtain good mechanical properties maintaining the magnetic characteristics of the Insulated Iron Powder Compounds (I.I.P.C.) taken as reference. The paper presents the activity that has been carried out in the realization of SMC mixing iron powders and phenolic resin, in different weight percentages and mold pressures. The obtained results are considered satisfactory under the point of view of the compromise between magnetic and mechanical properties, considering also that the required productive process is simpler. The comparison of the obtained results with those related to commercial products encourages to carry on the research, also because of the reduced cost of the proposed SMC at parity (or better) performance.

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“…For this propose, new magnetic materials are being studied in recent years and have been adopted in partial or total substitution of traditional ones [4]- [6]. Dealing with permanent magnets, the use of NdFeB bonded magnets in place of ferrites and, in some occasions, of NdFeB sintered magnets, permits to obtain magnets in complex net shapes with very good magnetic characteristics [7], [8]. Considering the soft magnetic part of electrical machines circuits, laminated steels can be replaced by Soft Magnetic Composites materials commonly known as SMC [9], [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Granulometry and Oxygen Content on SMC Magnetic Properties

Pošković¹,

Franchini²,

Grande

et al. 2017

Acta Metall Slovaca

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The interest around the adoption of Soft Magnetic Composite materials (SMC) in the realization of electric machines, or parts of electric machines, is continuously increasing. The main reason lies on the opportunity to realize magnetic circuits following a 3D design procedure, which is not allowed with the adoption of the traditional lamination sheets. This is not the only reason, as a lot of research is being carried out on the losses distribution in the magnetic material, particularly as function of the frequency. In this paper different iron powders have been analyzed to investigate the impact of the granulometry on the SMC performance; in particular the grain size and the oxygen content have been considered variable parameters. The materials, prepared, compacted and tested in our laboratories, have been characterized to obtain the magnetic characteristic and information about the iron losses.

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Bonded magnets for brushless fractional machines: Process parameters effects evaluation

Cited by 18 publications

References 30 publications

Hybrid magnetic composite (HMC) materials for sensor applications

Hybrid magnetic composite (HMC) materials for sensor applications

New Soft Magnetic Composites for electromagnetic applications with improved mechanical properties

Effect of Granulometry and Oxygen Content on SMC Magnetic Properties

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