NEOMAX Engineering Co.

Takasaki, Japan

NEOMAX Engineering Co.

Takasaki, Japan

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Enomoto Y.,Hitachi Ltd. | Iwasaki N.,Hitachi Ltd. | Kitamura M.,Hitachi Ltd. | Mita M.,NEOMAX ENGINEERING Co. | Masuzawa M.,NEOMAX ENGINEERING Co.
IEEJ Transactions on Industry Applications | Year: 2013

A prototype of the flux-modulated type magnetic gear is manufactured and tested to evaluate its efficiency and torque transmission characteristics. According to the test results, the maximum torque transmission is proportional to the gear's size and the flux density of each rotor. The efficiency of the gear is dependent upon core material and core shape. As for the gear made for trial purposes, the efficiency of 99% was obtained in the maximum. The prototype gear obtained comparative advantages over mechanical gears with respect to efficiency and noise. © 2013 The Institute of Electrical Engineers of Japan.


Miyamasu M.,Shibaura Institute of Technology | Nakamura Y.,Shibaura Institute of Technology | Akatsu K.,Shibaura Institute of Technology | Masuzawa M.,NEOMAX Engineering Co.
IEEJ Transactions on Industry Applications | Year: 2013

This paper describes permanent magnet synchronous motors by having the characteristics of a bonded magnet. In general, most PMSMs use a Nd-Fe-B sintered magnet. Because the Nd-Fe-B sintered magnet has a high magnetic energy, it is possible to obtain high torque and high output power. On the other hand, the magnetic energy of the bonded magnet is lower than that of the Nd-Fe-B sintered magnet. However, this magnet has a higher permeability than the Nd-Fe-B sintered magnet and the eddy current is negligible. It is found that flux weakening control is useful because of the high permeability. This paper presents experimental results that verify the usability of the bonded magnet machines. © 2013 The Institute of Electrical Engineers of Japan.


Anghel A.,Paul Scherrer Institute | Jakob B.,Paul Scherrer Institute | Bruegger M.,Paul Scherrer Institute | Schmidt T.,Paul Scherrer Institute | And 2 more authors.
Refrigeration Science and Technology | Year: 2012

The cryogenic permanent magnet undulator (CPMU) is an insertion device in which the permanent magnets are cooled down to cryogenic temperatures to improve the magnetic performance in terms of the remanent field and coercivity. As it was found recently, the peak field and coercivity of permanent magnet materials like NdFeB are increasing as the temperature is decreased and reached a maximum at around 130 K. This temperature is not directly attainable by boiling of standard cryogenic fluids like liquid nitrogen (77 K) or liquid helium (4.2 K). We present a practical and reliable cooling method based on the thermal shunt principle with either liquid nitrogen or a cryocooler as a cold source. Design criteria, cryogenic analysis and the layout of a CPMU based on this principle are presented. A new CPMU with a magnetic period of 14 mm and a magnetic length of 1.7 m, has been manufactured and is presently installed and in operation at the Swiss Light Source (SLS) as part of a collaboration between PSI (Paul Scherrer Institute), SPring-8 and Hitachi Metals, Ltd.


Takada Y.,Tohoku University | Takahashi M.,Tohoku University | Kikuchi A.,NEOMAX Engineering Co. | Tenkumo T.,Tohoku University
Dental Materials Journal | Year: 2014

The corrosion resistance of different magnetic assemblies —Magfit DX800 (Aichi Steel), Gigauss D800 (GC), Hyper Slim 4013, and Hicorex Slim 4013 (Hitachi Metals)— were electrochemically evaluated using anodic polarization curves obtained in 0.9% NaCl solution at 37°C. Stainless steels (444, XM27, 447J1, and 316L) composing the magnetic assemblies were also examined as controls. This revealed that all of the magnetic assemblies break down at 0.6–1.1 V; however, their breakdown potentials were all still significantly higher (p<0.05) than that of 316L. The distribution of elements in the laser welding zone between the yoke and shield ring was analyzed using EPMA; except with Magfit DX800, where the Cr content of the shield ring weld was greater than that of 316L. These magnetic assemblies are expected to have good corrosion resistance in the oral cavity, as their breakdown potentials are sufficiently higher than the 316L commonly used as a surgical implant material. © 2014, Japanese Society for Dental Materials and Devices. All rights reserved.


Huang J.-C.,National Synchrotron Radiation Research Center | Chang C.-H.,National Synchrotron Radiation Research Center | Chen J.-T.,National Synchrotron Radiation Research Center | Hwang C.-S.,National Synchrotron Radiation Research Center | And 2 more authors.
Lecture Notes in Electrical Engineering | Year: 2014

An advanced undulator technology is critical for highly brilliant synchrotron radiation in a third-generation light source. Tight mechanical specifications are required to obtain a satisfactory magnetic performance and photon energy spectrum. In general, the mechanical deformation and backlash must both be controlled within 10 lm under magnetic force 3600 kgf. This paper describes a mechanical gap-driven system and the deformation of its mechanical frame. The deformation of a magnet support beam can be calculated from the variation of the magnetic field. © Springer International Publishing Switzerland 2014.


Akatsu K.,Shibaura Institute of Technology | Masuzawa M.,NEOMAX Engineering Co.
2011 International Conference on Electrical Machines and Systems, ICEMS 2011 | Year: 2011

This paper shows permanent magnet synchronous motors with characteristics of bonded magnet. In general, most of PMSMs use the Nd-Fe-B sintered magnet. Although a magnetic energy of the bonded magnet is lower than of the Nd-Fe-B sintered magnet, a new Nd bonded magnet has higher permeability than the Nd-Fe-B sintered magnet and an eddy current is negligible. It is found that the flux weakening control is useful because of the high permeability. This paper shows experimental results which are presented to verify the availability of the bonded magnet machine. © 2011 IEEE.

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