Passive Magnetic Bearing: Design Becomes Reality



The collaboration between Lawrence Livermore National Laboratory ( LLNL ) and Arnold Magnetic Technologies ( Arnold ) began with a theoretical design developed by Dr. Dick Post of LLNL, and became a reality through the manufacturing expertise of Arnold. For the past several months, Arnold and LLNL collaborated on designing, building, and testing a prototype passive magnetic bearing system. The objective of the Arnold / LLNL relationship was to prove Dr. Post s ....etc

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A magnetic bearing is a bearing that supports a load using magnetic levitation. Magnetic bearings accept moving parts without physical contact. For example, they are able to levitate a rotating shaft and allow relative movement with very low friction and without mechanical wear. Magnetic bearings withstand the highest speeds of all types of bearings and do not have a maximum relative speed. Passive magnetic bearings use permanent magnets and, therefore, do not require any input power, but are difficult to design beca ....etc

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Mechanical Design of a Robotic System for Automatic Installation of Magnetic Markers on the Roadway

MAGNETIC REFERENCE MARKER INSTALLATION :

n Involves drilling the roadway surface.

n Stacked ceramic magnets and neodymium magnets require hole depth that are just 10.1 cm and 2.5 cm.

n Vehicles depend on the magnet for speed detection and lateral road position.

Figure 11:Magnetic reference marker installation robot

Figure 12:Schematic marker installation trailer

STRUCTURAL DESIGN :

n Special attention needs to be paid to ....etc

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A control device for controlling displacement of a magnetically supported moving member according to a command, comprising:

a feedback circuit for detecting the displacement of the moving member to control the moving member to ensure stability and robustness of the magnetic support in response to the detected displacement, the feedback circuit comprising a closed loop composed of a displacement detector receptive of an output from a displacement sensor, an integral compensator coupled to the displacement sensor, a phase advancing compensato ....etc

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