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Research on Rotor Position Self-sensing and Power Amplifiers of Active Magnetic Bearings

Author: DongRui
Tutor: ZhangDanHong
School: Wuhan University of Technology
Course: Control Theory and Control Engineering
Keywords: Magnetic bearings Displacement self-test Tri-state power amplifier Differential transformer test method
CLC: TP274
Type: Master's thesis
Year: 2006
Downloads: 148
Quote: 4
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Abstract


Active magnetic bearings is to use the magnetic force of the rotor is suspended in the space, so that no mechanical contact between the rotor and stator of a high-performance bearings. It is mechanics, rotor dynamics, control engineering, electromagnetics, and computer science at one of the most typical mechatronic product. With conventional ball bearings, Wei-bearing oil film bearing compared with no mechanical wear, low energy consumption, low noise, long life, no lubrication, no pollution, such as a series of advantages. It has broad application prospects in the field of energy, transportation, industrial machinery, aerospace, robotics and other high-tech. In order to achieve the control of the position of the rotor in the magnetic bearing system, the need to establish the position of a closed loop feedback control system. Use of displacement sensors, but because of the presence of the displacement sensor, so that the axial magnetic bearing size, system controller design complex, dynamic performance degradation, and the high cost, low reliability, these greatly limits the magnetic bearing in industrial application. International in order to overcome a series of shortcomings in the use of sensors, a new research direction - from the detection of magnetic bearings (Self-sensing Magnetic Bearing). Since the rotor displacement detecting the magnetic bearing system is based on the current or voltage signal in the solenoid coil to obtain, due to the displacement sensor is not required, since the the detected magnetic bearing has a series of advantages. This paper describes the method of self-testing and self-detection principle, and small signal injection test method and differential transformer test method detailed analysis and mathematical derivations. On the basis of theoretical analysis, system design and simulation the differential transformer test method applies to larger power output. Simulation results show that the use of differential transformer testing method can accurately obtain the displacement of the rotor, and the stability of the suspension of the rotor. PA is an important component of the magnetic bearing system, which is based on the controller output current proportional to the signal generated in the magnetic bearing stator coils in order to produce the required electromagnetic force. Power amplifier controller controls the execution of the command, and it has an important impact on the performance of the entire system. In order to improve the performance of self-detection of magnetic bearing systems, according to the theory of the three-state power amplifier, using the phase shift method to design the tri-state control transformer test method applies to the differential power amplifier and the tri-state bias power amplifier. Simulation and experimental studies have shown that the design of the power amplifier has a better performance than the ordinary two-state power amplifier.

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