Experimental study of magnetic slurries regarding magnetic properties

Author

Engdahl, G. ; Lerebourg, B.

Author_Institution

ABB Corp. Res., Vasteras, Sweden

Volume

32

Issue

5

fYear

1996

fDate

9/1/1996 12:00:00 AM

Firstpage

5109

Lastpage

5111

Abstract

The aim of this study was to assess the basic magnetic properties of a mixture composed of a commercial lubricant and soft magnetic iron particles, where the particle content is significantly higher than in conventional magnetic fluids, due to the fact that the particles verge on the sedimentation level. This so called magnetic slurry can, then, be regarded as a highly ductile magnetic conducting material for tentative use in a magnetic circuit that can change shape under operation. The high particle content results in high saturation field densities that extend the application field towards electric power engineering. This paper, therefore, focuses on properties like relative permeability, losses, the Q-factor and the efficiency for the power frequencies 50 and 400 Hz. It shows that the relative permeabilities are low (below 10). The values of the efficiency and the Q-factor decrease considerably above 0.5 T. That limits the application of the studied slurry in electric power engineering. In such applications, the powder properties must be improved

Keywords

Q-factor; ferromagnetic materials; iron; magnetic circuits; magnetic fluids; magnetic hysteresis; magnetic leakage; magnetic permeability; sedimentation; soft magnetic materials; 0 to 1 T; 400 Hz; 50 Hz; Fe; Q-factor; commercial lubricant; efficiency; electric power engineering; high saturation field densities; highly ductile magnetic conducting material; hysteresis loop; losses; magnetic circuit; magnetic fluids; magnetic properties; magnetic slurries; particle content; powder property improvement; power frequencies; relative permeability; sedimentation level; shape changing circuit; soft magnetic Fe particles; Iron; Lubricants; Magnetic liquids; Magnetic properties; Permeability; Power engineering and energy; Q factor; Saturation magnetization; Slurries; Soft magnetic materials;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.539506

Filename

539506