Micro-magnetic bearing characteristics

Title: Micro-magnetic bearing characteristics of anti-Author: Chen JieyuDegree-granting units: Shanghai Jiaotong UniversityKeywords: anti-magnetic;; MEMS;; bearings;; rotor dynamicsSummary:MEMS (Micro Electromechanical System, MEMS) that contains electronic components and other micro-entities (
Including mechanical, thermal, magnetic, fluid, optical, chemical, biological components, etc.) the set of sensors, actuators, signal processing, neodymium magnets communications, access
Port, control circuit and power supply in one system. A typical feature size of MEMS devices around 1μm ~ 1cm between the miniaturization
Many features make the macro-scale can not be applied in the physical principles found in the microscopic scale to achieve the possibility of passive temperature
Anti-Maglev is one of them.Anti-magnetic materials is the magnetic susceptibility is negative, including gold, silver, copper, lead, graphite, water,
Organic compounds. According to Earnshaw theorem, paramagnetic materials, ferromagnetic materials, and not an independent force between the magnetic stability
Suspension. If the introduction of anti-magnetic material, the use of its external magnetic field, a slight resistance to the role, you can achieve stable at room temperature passive magnetic levitation. Diamagnetic
Suspension principle although in some high-precision scientific sensors are applied, but because the magnetic resistance of magnetic material is too weak, can not provide sufficient
The bearing capacity of the bearing has not yet been involved in the application. According to the scale effect of electromagnetic force analysis, the permanent magnet magnetic field gradient system with special
Scales inversely proportional to the decrease of levy increases, due to anti-magnetic effect is proportional to the magnetic field gradient, anti-magnetic due to the characteristics of MEMS miniaturization can be
For the micro-mechanical structure provides a http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php simple and effective method of support.Micro-magnetic bearing anti-electromagnetic theory related to the research, materials science, engineering
Process design, process technology and other disciplines, is rich in content, micro-electromechanical systems bearing design provides a new idea. This
To establish the basic design of micro-magnetic bearing anti-theoretical system as the goal, main contents include:(1) anti-micrometer magnetic levitation principle
Degree of effectiveness of the argument, based on the study of micro-systems to adapt to anti-micro-processing technology the basic design of magnetic bearings, and in accordance with the magnetic field energy
Theoretical calculations to study the bearing capacity of the bearing design parameters and kinetic parameters, stability of bearings to achieve suspended
Floating conditions, anti-magnetic bearings made of micro optimization programs;(2) anti-non-contact magnetic bearing structure requires a non-contact
The damping method, feasible options, including air film damping and eddy current damping. For the eddy current damping, anti-magnetic bearing according to this article
Structural characteristics of the thin plate approximation model and the method of images created bearing eddy current model, the analysis of the rotor axial, radial and tilt
Direction of the electromagnetic damping characteristics of the eddy current damping effect of the loss of bearing rotation by comparison with gas-film damping, demonstrated the power
Resistance in the micro-eddy current damper feasibility of the application in magnetic bearings.(3) in the kinetic parameters of micro-analysis of anti-magnetic bearing base
On that basis, the establishment of the bearing rotor dynamics model to analyze the different operating conditions and design of the bearing dynamics under the proposed improvements
Bearing dynamic stability of the program.(4) for non-ideal processing conditions caused by the anti-magnetic bearing magnetic bias for the study of permanent magnet
Body asymmetry and anti-magnetic material magnetized non-uniform magnetic bearing performance, and analysis of the bearing rotation loss characteristics.
(5) against the magnetic bearing of the basic vibration characteristics studied.Miniature MEMS anti-magnetic bearings adapted to the characteristics of quasi-plane processing
, Compared with conventional bearing solutions, anti-magnetic bearings take full advantage of the characteristics of MEMS miniaturization, with simple, the work environment requirements
The advantages of low, and combined with other bearing solutions, to expand the study of thinking. This paper as an anti-magnetic principle in micro-electromechanical systems
Application of the initial exploration, the establishment of the anti-mechanical properties of magnetic bearings the basic theoretical framework for this new program design, optimization, driver side
Style choices and run strategy developed to provide the necessary basis.Degree Year: 2009