scholarly journals Design and analysis of a novel spoke‐type motor to reduce the use of rare‐earth magnet materials

2021 ◽  
Author(s):  
Chang‐Hoon Seok ◽  
Hong‐Soon Choi ◽  
Jangho Seo
Keyword(s):  
Rare Earth ◽  
Rare Earth Magnet ◽  
Type Motor

scholarly journals Retrospective analysis of pediatric patients with multiple rare-earth magnets ingestion: a single-center experience from China

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Yucan Zheng ◽  
Zhihua Zhang ◽  
Kunlong Yan ◽  
Hongmei Guo ◽  
Mei Li ◽  
...  
Keyword(s):  
Rare Earth ◽  
Digestive Tract ◽  
Foreign Bodies ◽  
Clinical Symptoms ◽  
Medical Center ◽  
Rare Earth Magnet ◽  
Gastrointestinal Obstruction ◽  
Asymptomatic Patients ◽  
Significant Difference ◽  
Surgical Group

Abstract Background The aim of this study was to characterize patients who ingested multiple rare-earth magnets, reveal the harm of rare-earth magnet foreign bodies in the digestive tract, and develop a clinical management algorithm. Methods This was a retrospective review of patients with rare-earth magnet foreign bodies in the digestive tract admitted to a university-affiliated pediatric medical center in China, between January 2016 and December 2019; the subset of medical data evaluated included clinical symptoms, signs, treatments and outcomes. Results A total of 51 cases were included in this study, including 36(70.6%) males and 15(29.4%) females. The magnets were passed naturally in 24(47.1%) patients and removed by intervention in 27(52.9%) patients, including 5(9.8%) cases by endoscopy and 22(43.1%) cases by surgery. Twenty-two (43.1%)cases had gastrointestinal obstruction, perforation, and fistula. Compared with the non-surgical group, the time of the surgical group from ingestion to arriving at the hospital was longer([80(5–336) vs 26(2–216)]hours, p < 0.001) while there was no significant difference in the mean age or the number of magnets swallowed. Conclusions Magnets are attractive to children, but lead to catastrophic consequences including gastrointestinal obstruction, perforation, and surgical interventions when ingested multiple magnets. Endoscopic resection should be urgently performed in the presence of multiple magnets as early as possible within 24 h, even in asymptomatic patients.

scholarly journals Recycling of Rare Earth Magnet Scraps as Magnetic Materials

2004 ◽  
Vol 51 (3) ◽  
pp. 160-164
Author(s):  
Ken-ichi Machida ◽  
Masahiro Itoh ◽  
Masahiro Masuda ◽  
Seiji Kojima
Keyword(s):  
Rare Earth ◽  
Magnetic Materials ◽  
Rare Earth Magnet

scholarly journals A Three-Dimensional Magnetic Force SolutionBetween Axially-Polarized Permanent-Magnet Cylinders for Different Magnetic Arrangements

2020 ◽  
Vol 7 ◽  
Keyword(s):  
Experimental Data ◽  
Rare Earth ◽  
Field Strength ◽  
Permanent Magnet ◽  
Magnetic Force ◽  
Three Dimensional ◽  
Method Of Images ◽  
Field Equations ◽  
Rare Earth Magnet ◽  
Finite Sums

A three-dimensional field solution is presented foraxially polarized permanent magnet cylinders. The fieldcomponents are expressed in terms of finite sums of elementaryfunctions and are easily programmable. They can be used todetermine the operating point of rare-earth magnet cylinders.They are also useful for performing rapid parametriccalculations of field strength as a function of materialproperties and dimensions. The field components aredeveloped for different magnet arrangements by taking intoaccount the back iron. Also the method of images is used. Usingthe field equations, three-dimensional analytical expressionsare derived for computing the magnetic force between axiallypolarized permanent-magnet cylinders for different magneticarrangements. The field calculated results are in goodagreement with the experimental data.

scholarly journals Direct Drive Applications: Possible Replacement of Rare-Earth Permanent Magnet Motors

Energies ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 8058
Author(s):  
Chaelim Jeong ◽  
Luca Cinti ◽  
Nicola Bianchi
Keyword(s):  
Rare Earth ◽  
Permanent Magnet ◽  
Low Energy ◽  
Direct Drive ◽  
Permanent Magnet Motors ◽  
Stator Flux ◽  
Type Motor

This paper deals with the possibility to replace rare-earth permanent magnet (PM) motors in direct drive applications. According to previous researches, there are alternatives such as surface-mounted PM motors and spoke-type motors adopting Ferrite PMs, synchronous reluctance motors, with or without the assistance of low-energy PMs. Few studies have been carried out to compare all models at once, thus it is hard to choose which type motor is to be preferred as a valid alternative of rare-earth PM motors in direct drive applications. In this paper, the representative candidates listed above are analyzed and the results are compared with that of a rare-earth PM motor, which is considered as a reference motor. Additionally, the demagnetization phenomenon of the motors with Ferrite PMs is deeply analyzed because this kind of PM may be easily demagnetized by the stator flux. Finally, both strengths and weaknesses of each alternative motors are highlighted.

scholarly journals Corrosion of an Implanted Medical Device: Rare-Earth Magnet Case Study

2013 ◽  
Vol 19 (S2) ◽  
pp. 1834-1835
Author(s):  
E.P. Guyer ◽  
B. Pound ◽  
S. Crane
Keyword(s):  
Rare Earth ◽  
Medical Device ◽  
Rare Earth Magnet

Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

scholarly journals Magnetic Apposition across the Epiglottis: Radiographic and Operative Correlation of a Rare Hypopharyngeal Foreign Body

2020 ◽  
Vol 2020 ◽  
pp. 1-4
Author(s):  
Yeli Pi ◽  
Shilpa Radhakrishnan ◽  
Yaser Alrajhi ◽  
Ravi Bhargava
Keyword(s):  
Rare Earth ◽  
Foreign Body ◽  
Interesting Case ◽  
Radiographic Findings ◽  
Case Presentation ◽  
Rare Earth Magnet ◽  
Soft Tissue Neck ◽  
Pressure Necrosis ◽  
Magnet Ingestion ◽  
Magnetic Foreign Body

Background and Aim. Rare-earth magnet ingestions are a subset of foreign body ingestions and can result in significant morbidity secondary to pressure necrosis. These magnets are best visualized radiographically, typically located in the gastrointestinal tract. However, unusual locations of magnetic adherence may include the hypopharynx along the epiglottis, where only 2 previous cases have been reported. Clinicians should be aware of the potential dangers of rare-earth magnet ingestion and consider atypical locations of attachment in the appropriate clinical setting. Case Presentation. We present an interesting case of a fourteen-year-old female patient who presents with witnessed ingestion of multiple rare-earth magnets. Soft-tissue neck radiographs demonstrate two adjacent rounded radiopaque densities in the hypopharynx. Intraoperative images confirmed the radiographic findings and identified two magnetic balls stuck along the dorsal and ventral aspect of the epiglottis without evidence of pressure necrosis. Conclusion. This is the first published case of magnetic foreign body adherence to the epiglottis in the Radiology literature. Awareness and recognition of the unique radiographic findings of this rare entity can help clinicians streamline timely management.

Clean Energy Harvester Using Rare Earth Magnet and Ferro-Fluid

2016 ◽  
pp. 461-464
Author(s):  
Vivek Kumar ◽  
Kshitij Chopra ◽  
Amit Kumar ◽  
Abhishek Verma ◽  
Vinoth Kumar Jain
Keyword(s):  
Rare Earth ◽  
Energy Harvester ◽  
Clean Energy ◽  
Rare Earth Magnet
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