DocumentCode :
768580
Title :
A simple dynamic model for eddy currents in a magnetic actuator
Author :
Feeley, Joseph J
Author_Institution :
Dept. of Electr. Eng., Idaho Univ., Moscow, ID, USA
Volume :
32
Issue :
2
fYear :
1996
fDate :
3/1/1996 12:00:00 AM
Firstpage :
453
Lastpage :
458
Abstract :
This paper presents a simple dynamic model of eddy currents in a magnetic actuator. The model is based on the application of Maxwell´s equations to a homogeneous ferromagnetic conductive material. The resulting diffusion equation is solved in two dimensions for a cross-sectional cut through a rectangular bar; boundary conditions are imposed by a sinusoidally varying actuator coil current. The utility of the new modeling approach is illustrated by predicting the dynamic performance of a magnetic bearing actuator. The predictions are found to be in good agreement with measured values. The model provides a new and convenient method of modeling the relationships among voltage, current, force, and flux in magnetic circuits containing eddy currents
Keywords :
actuators; eddy currents; magnetic circuits; magnetic devices; Maxwell equations; boundary conditions; dynamic model; eddy currents; homogeneous ferromagnetic conductive material; magnetic actuator; magnetic bearing actuator; magnetic circuits; rectangular bar; two dimensional diffusion equation; Actuators; Boundary conditions; Coils; Conducting materials; Eddy currents; Magnetic flux; Magnetic levitation; Magnetic materials; Maxwell equations; Predictive models;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/20.486532
Filename :
486532
Link To Document :
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