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System Design and Structural Optimization for AC Active Magnetic Bearings Using in High Speed Electric Spindle

Author: ChengXin
Tutor: ZhuDeHong
School: Jiangsu University
Course: Power Electronics and Power Drives
Keywords: Active magnetic bearings Exchange Characterization Parameter design Electric spindle Digital control Simulation Study
CLC: TH133.3
Type: Master's thesis
Year: 2010
Downloads: 146
Quote: 1
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Abstract


Magnetic bearing rotor suspended in space, using magnetic force between the stator and the rotor without mechanical contact of a new high-performance bearings, friction and wear, no lubrication and sealing, high speed, high precision, long life and many advantages, has potential applications in the field of CNC machine tools and machining. At home and abroad on the magnetic bearing for DC-type magnetic bearing, relative to AC inverter and DC switching power amplifier bulky, high power consumption and cost. Thesis designed a new type of three-phase AC active magnetic bearings and a set of radial, axial control in one radial - axial shared bias current active magnetic bearings, three-phase power inverter are used to provide the radial control current, greatly reduced volume of power amplifier, reducing power losses, reduce costs, three degrees of freedom active magnetic bearings using axial coil for both axial and radial magnetic bias flux, greatly improve the bearing capacity of the magnetic bearing radial . On this basis, the paper design a prototype magnetic bearing for supporting high-speed electric spindle five degrees of freedom, and digital control system, laid the foundation for electric spindle into the practical. Article main research work are as follows: First, the design of the three-phase AC active magnetic bearings for high-speed electric spindle suspended supported radial - axial the shared bias current active magnetic bearings, magnetic equivalent circuit method of two magnetic bearings a magnetic circuit was calculated, and its radial and axial levitation force mathematical model is derived. Based on mathematical models and performance requirements, the design parameters. Respective suspension force nonlinear and coupling characteristics using simulation software MATLAB simulation analysis, computational analysis of the mechanical structure and magnetic structure of the magnetic bearing using ANSOFT Software, and two new magnetic bearing control strategy. Second, MATLAB / SIMULINK simulation environment to build a radial - axial shared bias current active magnetic bearing control system simulation model and a simulation study. The simulation results show that the PID a distributed control system has good dynamic and static performance of each degree of freedom. Finally, the use of TI's TMS320F2812 DSP chip as five degrees of freedom of the AC magnetic bearing system digital controller designed digital controller hardware circuits and software flowchart. Theoretical studies and simulation: five degree of freedom in exchange for high-speed electrical spindle suspended support this thesis the magnetic bearing system, reasonable structure and parameters of the design, build digital control system is reasonable.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanical parts and gear > Moving parts > Bearing
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