Eddy current model for 1D magnetic bearing simulations

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:390769

Kim, C; Palazzolo, A ^[1]; Kascak, A; Brown, G; Provenza, A; Montague, G

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1. Texas A&M Univ., College Station, TX (United States)

Eddy current induced phase lag of the B field within a magnetic bearing gap is known to affect both stability and power dissipation. This component of the gap`s field arises from the 2D or 3D motion of stator or rotor surface currents. This phenomenon is often quite complex requiring solution of Maxwell`s equations along with the constitutive relations. Magnetic bearings are frequently designed by employing 1D magnetic circuit analysis representing coils and permanent magnets as Sources and reluctance as resistors. Test data shows that this may be inadequate since it does not explain the frequency dependence of B amplitudes and the occurrence of phase lags. The present research aims to provide guidance for incorporating eddy current lag in a 1D magnetic circuit model. Although the results are derived for specific bearings, the procedure and qualitative effects may be utilized for other geometries. The magnetic bearing designer may implement these and the additional results provided in the paper to derive a conservative design. The results in the paper are based on 4 magnetic bearings: (a) Radial, homopolar I (test data). (b) Radial, homopolar (finite element model). (c) Axial (test data).

• OSTI ID: 390769
• Report Number(s): CONF-950852--
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
COMPUTERIZED SIMULATION
CONTROL SYSTEMS
EDDY CURRENTS
ENERGY LOSSES
FEEDBACK
MAGNETIC BEARINGS
ROTORS