Magnetic Bearings英.ppt


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文档列表 文档介绍
Joint Advanced Student School 2006
Jeff Hillyard
Technische Universität München
ic Bearings
Overview ic Bearings
Introduction
ism Review
Active ic Bearings
Passive ic Bearings
Industry Applications
Introduction ic Bearing Types
Active/passive ic bearings
electrically controlled
no control system
Radial/axial ic bearings
Introduction Motivations
Advantages of ic bearings:
contact-free
no lubricant
(no) maintenance
tolerable against heat, cold, vacuum, chemicals
low losses
very high rotational speeds
Disadvantages:
complexity
high initial cost
Minimum Equipment for AMB
Source: Betschon
Introduction Survey of ic Bearings
Source: Schweitzer
ism ic Field
north pole
south pole
ic field line
iron filings
Pole Transition
ism ic Field
ic field, H, is found around a or a current carrying body.
(for one current loop)
H
i
ism ic Flux Density
B = ic flux density
= ic permeability
H = ic field
m0 = permeability of free space
mr = relative permeability
ic
ic
ic
multiple loops of wire, n
Meissner-Ochsenfeld Effect
ism B-H Diagram
H
B
area within loop represents hysteresis loss
ic saturation
ic: a material that can be ized
Coercivity, Hc
Remanence, Br
ism Lorentz Force
f = force
Q = electric charge
E = electric field
V = velocity of charge Q
B = ic flux density

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  • 时间2018-02-21