Characteristic Examination of New Synchronous Motor that Composes Craw Teeth of Soft Magnetic Composite

Enomoto, Yûji; Ito, M.; Masaki, Ryoso; Asaka, Kazuo

doi:10.1541/ieejias.126.1585

Cited by 18 publications

(3 citation statements)

References 2 publications

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“…These benefits can improve its applicability in the electromagnetic valves of injectors 1,2) and motors. 3,4) Typically, the powder for powder magnetic cores is coated with nonmagnetic insulators, including silicone resins and phosphates, which induce magnetic resistance between the powder particles because of their demagnetizing field effects. Therefore, it is hard to magnetize as much as the magnetic field applied and achieve high permeability and saturation magnetization with typical powders.…”

Section: Introductionmentioning

confidence: 99%

Heat Treatment Effects on Electrical Resistivity of Spinel Ferrite Layer for Powder Magnetic Core

2019

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The powder magnetic core having a spinel ferrite insulating layer has enabled high magnetic flux density and high electrical resistivity, because spinel ferrite exhibits magnetic insulating properties. However, its the electrical resistivity of the powder magnetic core was reduced after annealing at 873 K, since FeO was formed in the spinel ferrite insulating layer. The eutectoid transformation caused the decomposition of FeO, which decompose into Fe 3 O 4 and ¡-Fe at the temperature range below 833 K. We verified the possibility of eutectoid transformation of FeO in the insulating layer by the two-step heat treatment at 873 K and 773 K. The presented results clearly showed that the two-step heat treatment increases the electrical resistivity of the insulating layer due to the disappearance of FeO by eutectoid transformation even in the insulating layer.

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Section: Introductionmentioning

confidence: 99%

Heat Treatment Effects on Electrical Resistivity of Spinel Ferrite Layer for Powder Magnetic Core

2019

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“…Those benefits can improve applications to choke coils for electronic equipment, 13) injection valves 4) and motors. 5,6) However, present powder magnetic cores present several difficulties: their magnetic flux density and strength are lower than those of electrical steel sheets. Normally, a powder magnetic core comprises particles of 100 µm diameter with surfaces coated with nonmagnetic insulative films such as silicone resins and phosphates.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties of Iron Core Compacted Powders Coated with Magnetic Insulative Film

2016

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To improve the permeability and magnetic flux density of a powder magnetic core, we examined iron core compacted powders coated with spinel ferrite particles. Their permeability and magnetic flux density are higher than those of iron core compacted powders coated with nonmagnetic insulative film having equal resistivity: 1.4 T magnetic flux density B 2k , 7.79 Mg/m 3 green density, and 70 µ³·m resistivity were achieved.

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“…These fields have various required motor specifications and there is a need to develop dedicated application‐oriented motors for each sector . Based on these trends, attention has been focused on soft magnetic composite (SMC) claw pole motors , which are good candidates for miniaturization and flat design, and their performance has been studied by the development of design methods and trial fabrication . A new type of motor whose material and construction differ from past concepts, called the clawtooth® motor, has been created.…”

Section: Introductionmentioning

confidence: 99%

Enlargement of Claw Pole Motor Using SMC Cores Divided in the Circumferential Direction

Koka

Naganuma

Enomoto

et al. 2015

Electrical Engineering Japan

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SUMMARYClawtooth motors have the feature that they can be made thin in the axial direction. This makes them suitable for appliances, automobile accessories, and small-sized industrial motors. On the other hand, there is a need for thinner HEV and elevator motors and large-sized industrial motors. In this study, we examined ways of increasing the output of clawtooth motors. We arrived at the following conclusions.(1) The optimal stator structure was determined and the prospects of attaining the target specification of 123 N-m were determined. (2) Three important manufacturing tasks, assurance of core assembly accuracy, thin coil manufacture, and rotator insertion, were identified.

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Characteristic Examination of New Synchronous Motor that Composes Craw Teeth of Soft Magnetic Composite

Cited by 18 publications

References 2 publications

Heat Treatment Effects on Electrical Resistivity of Spinel Ferrite Layer for Powder Magnetic Core

Heat Treatment Effects on Electrical Resistivity of Spinel Ferrite Layer for Powder Magnetic Core

Magnetic Properties of Iron Core Compacted Powders Coated with Magnetic Insulative Film

Enlargement of Claw Pole Motor Using SMC Cores Divided in the Circumferential Direction

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