Magnetic bearing and method for operation thereof
A technology of magnetic bearing and bearing body, applied in the direction of bearing, shaft and bearing, bearing cooling, etc., can solve the problems of uneven load of magnetic bearing, impossible gap adjustment, hindering accurate gap adjustment, etc.
Inactive Publication Date: 2011-06-29
THYSSENKRUPP TRANSRAPID +1
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Problems solved by technology
However, due to a one-sided pressure increase, for example in machine tools, in wind power plants due to fluctuations in the wind intensity or in scanners due to changes in the state of equilibrium due to tilted positions, weight offsets, etc., the magnetic bearings are loaded unevenly, In this case, then, due to the rule that the support gaps facing each other should remain of the same size, it follows that the magnet structures facing each other must be operated with different currents in order to comply with the above rule
This results in correspondingly different local temperature fluctuations in the winding due to electrical power losses, in particular in magnetic bearings with large dimensions, which lead to different thermal expansions of the bearing body or magnet structure and thus strongly impedes precise clearance adjustment, or even makes such clearance adjustment impossible
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[0015] figure 1 A magnetic bearing is schematically shown with a first bearing body 1 , which is designed as an inner ring and a rotor, and is rotatable along the double arrow θ, and a second bearing body 2 , which is designed as an outer ring and a stationary part. The bearing body 2 is provided in this embodiment with four magnet structures 3o, 3u, 4l and 4r, where the letters "o", "u", "l" and "r" respectively denote "upper" as used in this application , "down", "left" and "right". The magnet structures 3 o , 3 u on the one hand and the magnet structures 4 l and 4 r on the other hand are respectively arranged on opposite sides of the bearing body 1 , so that they form two pairs of magnet structures diametrically opposite each other. In addition, if figure 1 As shown schematically only for the magnet structure 3 o , each magnet structure 3 and 4 has a winding 6 wound on a core 5 . The pole faces 7 of the individual cores 5 are associated with the circumferential or radi...
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The invention relates to a magnetic bearing and to a method for operation thereof. The magnetic bearing contains a ferromagnetic, movably mounted bearing element (1) and at least two magnetic devices (3o, 3u) arranged on opposing sides of the bearing element (1) and equipped with windings (6), wherein during operation of the magnetic bearing, electric currents are conducted through the windings (6) and these currents are regulated such that in an equilibrium state between the bearing element (1) and the two magnetic devices (3o, 3u), bearing gaps (10o, 10u) of predetermined size (So, Su) form. According to the invention, the temperatures produced in the magnetic devices (3o, 3u) during operation are measured and the regulation of the currents takes place such that in the equilibrium state, regardless of the load situation, the same temperatures appear in the magnetic devices (3o, 3u) or in the windings (6) thereof (figure 1).
Description
technical field [0001] The invention relates to a method for operating a magnetic bearing according to the preamble of claim 1 and to a magnetic bearing of the type specified in the preamble of claim 7 . Background technique [0002] Magnetic bearings of the aforementioned type, which can be configured as radial bearings or axial bearings, and their method of operation are known in numerous variants (for example "Magnetlager, Prinzipund Berechnungsgrundlagen" by Roland Steffen, 2004, http: / / www.rolandsteffen.de ). [0003] Radial bearings of this type are mainly used for contact-free radial support of rotating bodies by means of a bearing body in the form of a circular bearing ring mounted on the radial bearing. These bearings are characterized in that they work without wear and do not require lubricants. Preferred fields of application are therefore vacuum technology and medical technology. Magnetically mounted heart pumps for cardiac surgery are known, for example. In ...
Claims
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Login to View More IPC IPC(8): F16C32/04
CPCF16C32/0442F16C32/0444F16C37/005F16C32/0451
Inventor 郑清华L·米勒
Owner THYSSENKRUPP TRANSRAPID