| 1. |
- Bourchas, K., et al.
(författare)
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Influence of Cutting and Welding on Magnetic Properties of Electrical Steels
- 2016
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Ingår i: Proceedings - 2016 22nd International Conference on Electrical Machines, ICEM 2016. - : Institute of Electrical and Electronics Engineers (IEEE). - 9781509025381 ; , s. 1815-1821
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Konferensbidrag (refereegranskat)abstract
- The magnetic properties, namely the iron losses and the relative permeability, of SiFe electrical steel laminations after mechanical and laser cutting are studied. Mechanical cutting with guillotine shears and cutting by means of fiber and CO2 lasers are considered. The magnetic measurements are conducted on the Epstein frame for frequencies of 50, 100 and 200 Hz. The specimens also include Epstein strips with 1, 2 and 3 additional cutting edges along their length, in order to increase the cutting effect and the characterization data. Mechanical cutting results in more than 20% iron loss increase and more than 40% relative permeability reduction at 1 T for 0.5 mm gauge, for a strip width of 10 mm compared with the reference of 30 mm, while corresponding values for laser cutting are 40% and 60%. It is also noted that different steel grades of the same raw material show lower magnetic deterioration with thinner lamination thickness. The influence of welding is also investigated by means of Epstein measurements. Experiments show an iron loss increase of up to 50% with a corresponding 62% reduction in the permeability compared to similar non-welded laminations. A model that incorporates the cutting effect with geometry dependency is developed and implemented in a FEM-based motor design software. Simulations made for an industrial low voltage induction motor indicate a more than 15% increase in the iron losses compared to a model that does not consider the mechanical cutting effect. In the case of laser cutting, this increase reaches 30% to 50%, depending on laser settings.
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| 2. |
- Magnussen, Freddy, et al.
(författare)
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Iron losses in salient permanent magnet machines at field-weakening operation : COVERING THEORY TO PRACTICE
- 2004
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Ingår i: CONFERENCE RECORD OF THE 2004 IEEE INDUSTRY APPLICATIONS CONFERENCE, VOLS 1-4: COVERING THEORY TO PRACTICE. - NEW YORK, NY : IEEE. - 0780384865 ; , s. 40-47
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Konferensbidrag (refereegranskat)abstract
- Permanent magnet machines for electric vehicles are often designed with a magnetic saliency to improve the torque generation as a result of the reluctance torque at field-weakening operation. The armature reaction is pronounced in such operation, leading to extensive magnetic field harmonics in the teeth and consequently iron losses. This paper analyses the iron losses in two designed machine topologies, inset and interior permanent magnet rotor structures, by measurements and finite element method computations. The measurements and calculations are performed on three prototypes-one with an in set design and two with an equal interior design, but different laminated stator core sheet thickness of 0,35 and 0,20 mm, respectively. The three machines have the same stator designs and water-cooled housings.
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| 3. |
- Berger, Rolf, et al.
(författare)
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A study of the structural and magnetic properties of TlCo2-xCuxSe2
- 2002
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Ingår i: J Alloys Comp. ; 343, s. 186-191
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Tidskriftsartikel (refereegranskat)abstract
- The structural and magnetic properties of TlCo(2-x)Cu(x)Se2 have been investigated experimentally. The antiferromagnetic coupling already found in TlCo2Se2 prevails on copper substitution but is weakened. For high copper contents, x larger tahn 1.3, Pauli paramagnetism occurs. -- The magnetic structure of teh unsubstituted TlCo2Se2 has been reinvestigated by neutron powder diffraction. Below 80K it is characterised by a helimagnetic arrangement of spins confined to the Co sheets, the helix running along the c-axis.
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| 6. |
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| 7. |
- Broddefalk, A, et al.
(författare)
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Magnetocrystalline anisotropy of (Fe1-xCox)(3)P
- 1998
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Ingår i: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 83:11, s. 6980-6982
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The magnetocrystalline anisotropy energy (MAE) of (Fe1-xCox)(3)P (x = 0, 0.1, 0.2, 0.33) has been studied in the temperature range 5 K-300 K. The compound crystallizes in a tetragonal structure with three non-equivalent metal sites and shows an easy plan
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| 8. |
- Broddefalk, A, et al.
(författare)
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Structural and magnetic properties of (Fe1-xMnx)3P (x < 0.25)
- 2000
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Ingår i: PHYSICAL REVIEW B. - : AMERICAN PHYSICAL SOC. - 1098-0121. ; 61:1, s. 413-421
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Tidskriftsartikel (refereegranskat)abstract
- Structural and magnetic properties of (Fe1-xMnx)(3)P compounds have been investigated by means of x-ray and neutron diffraction experiments, magnetization measurements, Mossbauer experiments, and first principles calculations. The Curie temperature of the
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| 9. |
- Broddefalk, A, et al.
(författare)
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Structural and magnetic properties of TlCo2-xCuxSe2, 0 <= x <= 1
- 2000
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Ingår i: PHYSICA B. - 0921-4526. ; 284, s. 1317-1318
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Tidskriftsartikel (refereegranskat)abstract
- Structural and magnetic properties of single-crystal TlCo2-xCuxSe2, 0 less than or equal to x less than or equal to 1, have been investigated by means of X-ray diffraction experiments and magnetisation measurements. TlCo2Se2 and TlCu2Se2 are isostructural
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| 10. |
- Giordanetto, Fabrizio, et al.
(författare)
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Design of Selective sPLA2-X Inhibitor (-)-2-{2-[Carbamoyl-6-(trifluoromethoxy)-1 H-indol-1-yl]pyridine-2-yl}propanoic Acid
- 2018
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Ingår i: ACS Medicinal Chemistry Letters. - : American Chemical Society. - 1948-5875. ; 9:7, s. 600-605
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Tidskriftsartikel (refereegranskat)abstract
- A lead generation campaign identified indole-based sPLA2-X inhibitors with a promising selectivity profile against other sPLA2 isoforms. Further optimization of sPLA2 selectivity and metabolic stability resulted in the design of (-)-17, a novel, potent, and selective sPLA2-X inhibitor with an exquisite pharmacokinetic profile characterized by high absorption and low clearance, and low toxicological risk. Compound (-)-17 was tested in an ApoE-/- murine model of atherosclerosis to evaluate the effect of reversible, pharmacological sPLA2-X inhibition on atherosclerosis development. Despite being well tolerated and achieving adequate systemic exposure of mechanistic relevance, (-)-17 did not significantly affect circulating lipid and lipoprotein biomarkers and had no effect on coronary function or histological markers of atherosclerosis.
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