Development of permeability measuring instrument.

Honkura, Y.; Fujii, Hideki; Watarai, A.; Arakawa, Hideo; Sumi, K.

doi:10.3379/jmsjmag.15.469

Cited by 4 publications

(5 citation statements)

References 1 publication

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“…This leads to a high remanence in resin bonded magnets produced from this powder as the powder is highly anisotropic and can therefore be easily aligned by a magnetic field 22. Further details about the d‐HDDR process and the texture memory effect (TME) are given in the references 23, 24…”

Section: Compositions and Magnetic Properties Of The Type 1 And Type mentioning

confidence: 99%

Recycling Used Nd‐Fe‐B Sintered Magnets via a Hydrogen‐Based Route to Produce Anisotropic, Resin Bonded Magnets

Gutfleisch

Güth

Woodcock

et al. 2012

Advanced Energy Materials

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Hydrogen processing (HD + HDDR) is used to recycle Nd‐Fe‐B sintered magnets yielding anisotropic resin bonded magnets (RBM). HD produces single‐crystalline powders from the sintered magnets. HDDR improves the magnetic properties by producing ultrafine grained, highly textured polycrystals. RBM produced from optimally processed recycled material shows comparable magnetic properties to non‐recycled RBM.

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Section: Compositions and Magnetic Properties Of The Type 1 And Type mentioning

confidence: 99%

Recycling Used Nd‐Fe‐B Sintered Magnets via a Hydrogen‐Based Route to Produce Anisotropic, Resin Bonded Magnets

Gutfleisch

Güth

Woodcock

et al. 2012

Advanced Energy Materials

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“…A previous research focused on the partial non-magnetization method in which a slit was processed in silicon steel with a laser, and a Cu or CuSi alloy wire was melted into the slit. 10) Another research reported that Fe-based soft magnetic material and NiCr alloy wire were melted by laser heating and non-magnetized by mixing to control a magnetic circuit; 11) a process that has been put to practical use in magnetic dentures.…”

Section: Introductionmentioning

confidence: 99%

Development of Rotor Core with High Magnetic Flux by Partial Non-Magnetic Improvement of Silicon Steel

Hamada

Watarai²,

Mitarai

et al. 2023

Mater. Trans.

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Flux leakage in the rotor core bridges is a problem specific to interior permanent magnet motors and has been unsolved till date. It is widely known that if the bridges are partially non-magnetically improved with low magnetic polarization, the leakage flux will be smaller, and the rotor will have a higher magnetic flux. We proposed that the portion of the silicon steel sheets that becomes the bridge after pressing can be nonmagnetized and laminated to fabricate the rotor core. Partially non-magnetic material with a polarization of almost zero was obtained by melting and mixing NiCr alloy powder with the silicon steel sheets. This non-magnetic improvement treatment was applied to the bridge in the rotor core sheet, in which the non-magnetic area width was 1.45 mm, and the prototype rotor core was fabricated by laminating 60 rotor core sheets. Upon measurement, the rotor core showed approximately 35% higher magnetic flux than a conventional one, with the actual value nearly identical to that obtained from the magnetic field analysis.

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“…A practical off‐diagonal MI sensor circuit which is recently commercialized is based on pulse‐current excitation. The rise/fall time of the excitation pulses can be made very small with the characteristic frequencies up to GHz.…”

Section: Introductionmentioning

confidence: 99%

Off‐diagonal magnetoimpedance in amorphous microwires for low‐field magnetic sensors

Panina

Yudanov

Морченко

et al. 2015

Physica Status Solidi (a)

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Magnetoimpedance (MI) in amorphous wires is widely used for the development of various sensors and smart composites with sensing functionalities. In the case of sensor applications, MI in off-diagonal configuration has a number of advantages including linearity, enhanced output voltage sensitivity, efficient resonance, or differential excitation schemes. In this article, we discuss the fundamentals of the off-diagonal MI in amorphous microwires, working principles, and design of miniature MI magnetic sensors. Considering the electrodynamic origin of MI, a comparison with orthogonal fluxgates is made with the purpose to suggest improvements in MI sensor design. This includes multi-wire configuration and suppression of the voltage offset caused by magnetic anisotropy helicity. New results on the heating effects reveal that the temperature stability along with sensitivity may be enhanced by annealing. The paper focus is aimed to demonstrate that the off-diagonal MI sensors have a high potential for improvements in terms of output voltage sensitivity, magnetic field resolution and temperature stability. 1 Introduction The magnetoimpedance (MI) in soft magnetic conductors demonstrating a very high sensitivity over a wide range of operating frequencies has been recently employed for the development of miniature sensors to detect extremely low magnetic fields, for example, the fields generated by electrical processes of the human heart (MCG [1, 2]). The MI effect includes an enormous change in the high frequency voltage across a magnetic conductor caused by the application of low magnetic fields in the range of few Oersted. In this respect, it can be compared with giant magnetoresistance but high operating frequencies require completely different MI sensor construction. It appears that a simple scheme of measuring the voltage across the MI material involves a number of difficulties associated with nonlinear MI characteristics and relatively low output voltage sensitivity. This scheme, however, is successfully used with thin-film MI materials combined with permanent magnetic layers to shift the operating field point [3-5].

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Development of permeability measuring instrument.

Cited by 4 publications

References 1 publication

Recycling Used Nd‐Fe‐B Sintered Magnets via a Hydrogen‐Based Route to Produce Anisotropic, Resin Bonded Magnets

Recycling Used Nd‐Fe‐B Sintered Magnets via a Hydrogen‐Based Route to Produce Anisotropic, Resin Bonded Magnets

Development of Rotor Core with High Magnetic Flux by Partial Non-Magnetic Improvement of Silicon Steel

Off‐diagonal magnetoimpedance in amorphous microwires for low‐field magnetic sensors

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