scholarly journals New compensation ferrometer design

2018 ◽  
Vol 69 (6) ◽  
pp. 411-414
Author(s):  
Aleš Havránek ◽  
Ivan Zemánek
Keyword(s):  
Magnetic Flux ◽  
Full Advantage ◽  
Magnetic Materials ◽  
Flux Density ◽  
Soft Magnetic Materials ◽  
Magnetic Flux Density ◽  
Soft Magnetic ◽  
Magnetomotive Force ◽  
Ac Magnetization ◽  
Force Compensation

Abstract The compensation ferrometer is an instrument for the measurement of open specimen soft magnetic materials parameters at AC magnetization based on the magnetomotive force compensation method. New magnetizing process regulator that controls voltage induced in measuring winding (magnetic flux density waveform) and the voltage induced across Rogowski-Chattock potentiometer (compensation) was developed recently. This paper deals with a new compensation ferrometer design that allows taking the full advantage of the new regulator. New ferrometer based on STEMlab platform improves precision and speed of the measurement.

Fe-based nanocrystalline FeBCCu soft magnetic alloys with high magnetic flux density

2011 ◽  
Vol 109 (7) ◽  
pp. 07A314 ◽  
Author(s):  
Xingdu Fan ◽  
Aibin Ma ◽  
He Men ◽  
Guoqiang Xie ◽  
Baolong Shen ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
Flux Density ◽  
Magnetic Flux Density ◽  
Soft Magnetic ◽  
Magnetic Alloys ◽  
Soft Magnetic Alloys

Relationship between Magnetic Flux Density and Temperature Distributions of Permanent Magnets by EDM

2012 ◽  
Vol 523-524 ◽  
pp. 322-327 ◽  
Author(s):  
Yoshihiro Ichimura ◽  
Hideki Takezawa ◽  
Naotake Mohri
Keyword(s):  
Magnetic Flux ◽  
Magnetic Materials ◽  
Flux Density ◽  
Permanent Magnets ◽  
Electrical Discharge Machining ◽  
Magnetic Flux Density ◽  
Input Energy ◽  
Machined Surface ◽  
Depth Direction ◽  
Temperature Distributions

It is difficult to machine permanent magnets by traditional machining such as turning, milling and grinding, because of magnetic force. However, electrical discharge machining (EDM), which is a non-contact thermal machining method, has been used for shape machining of magnetic materials. In the EDM process, non-magnetic materials such as copper and graphite are typically used for electrodes. Magnetic materials have a Curie point; therefore, their magnetic flux density reduces when they are heated to a high temperature. Because EDM is a thermal process, it has the potential to control the magnetic flux density of a machined surface. In this study, to clarify the relationship between magnetic flux density and temperature distributions in depth direction of permanent magnest by EDM, internal temperatures of magnets were investigated using a K type thermo couple during EDM. Neodymium magnets were used as work-pieces. The magnetic flux density of a machined neodymium magnet was measured. In addition, the effects of duty factor (D.F.) were also examined. The results showed that the average temperature inside of the magnet is determined by the input energy, depending on the discharge conditions. A decrease of surface magnetic flux density after EDM is affected by the magnitude of the area and the amount of decrease is due to the increase of the internal temperature of the magnet. Therefore, it isn’t determined by the magnitude of the simple input energy.

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