The Design Research of Inductance Sensor in the AMB Rotor System

2014 ◽  
Vol 602-605 ◽  
pp. 1463-1467
Author(s):  
Wen Tao Yu ◽  
Hong Wei Li ◽  
Shu Qin Liu
Keyword(s):  
Design Research ◽  
Simulation Analysis ◽  
Low Cost ◽  
High Sensitivity ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Current Sensor ◽  
Electromagnetic Environment ◽  
Sensor Structure ◽  
Inductance Sensor

The sensor is an important part of the active magnetic bearing system, which directly affects the performance of the entire system. Compared with the eddy current sensor, inductive sensor has the advantages of low cost, high sensitivity, and is not sensitive to the electromagnetic environment; Influenced by the ambient temperature is small. In this paper, design research from two aspects of the sensor structure and circuit, and the sensor was simulation analysis, which laid the foundation in the application of magnetic bearing systems.

The Application Design of Inductance Sensor in Active Magnetic Bearing

2013 ◽  
Vol 364 ◽  
pp. 257-261 ◽  
Author(s):  
Wen Tao Yu ◽  
Hong Wei Li ◽  
Shu Qin Liu ◽  
Yun Peng Zhang
Keyword(s):  
Design Research ◽  
Magnetic Levitation ◽  
Design Method ◽  
Low Cost ◽  
High Sensitivity ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Electromagnetic Environment ◽  
Sensor Structure ◽  
Inductance Sensor

The sensor is an important part of the active magnetic bearing system, which directly affects the performance of the entire system. Compared with the eddy current sensor, inductive sensor has the advantages of low cost, high sensitivity, and is not sensitive to the electromagnetic environment; Influenced by the ambient temperature is small. In this paper, design research from two aspects of the sensor structure and circuit, and the sensor was tested and successfully used in maglev blower. This sensor design method can also be applied on other active magnetic bearings, such as magnetic levitation heart pumps, etc.

Vibration Mitigation of Rotors Suspended on Low-Cost Hybrid Gas Foil Bearing

2019 ◽  
Author(s):  
Kamal Kumar Basumatary ◽  
Karuna Kalita ◽  
Sashindra K. Kakoty ◽  
Seamus D. Garvey
Keyword(s):  
High Speed ◽  
Low Cost ◽  
Current Source ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Electromagnetic Actuators ◽  
Manufacturing Method ◽  
Foil Bearings ◽  
Foil Bearing ◽  
Small Series

Abstract The hybrid Gas Foil Bearings combining the Gas Foil Bearing and Active Magnetic Bearing is a possibility for application in high-speed turbomachinery and a few developments have been made in this context. As such, the cost of conventional Gas Foil Bearing increases due to its requirement of precise manufacturing method and the coating material for the top foil and bump foil. In case of Active Magnetic Bearing, the normal electrical arrangement includes a multiplicity of independently controlled current sources usually at least four drives per bearing which increases its cost. Therefore, the hybrid Gas Foil Bearing will have much higher cost. In this work, a new electrical arrangement for the electromagnetic actuators of the hybrid Gas Foil Bearing has been proposed. The new arrangement requires only two drives per bearing and the bias current has been provided (in the same set of windings) through a simple rectifier with small series choke and shunt capacitor. As the number of drives required is less, the proposed bearing will have low cost. Implementing the new approach, the force vectors are achieved using only two current-source drives whereas the usual conventional arrangement requires four such drives. Numerical simulations are performed to explore the capabilities of the low cost bearing.

scholarly journals CMOS Front-End of LNA for GPS and GSM wireless applications

2017 ◽  
Vol 7 (1.5) ◽  
pp. 1
Author(s):  
Mahesh Mudavath ◽  
K. Hari Kishore
Keyword(s):  
Power Dissipation ◽  
Simulation Analysis ◽  
Noise Figure ◽  
Low Cost ◽  
High Sensitivity ◽  
Low Noise ◽  
Frequency Range ◽  
Wireless Applications ◽  
Noise Amplifier ◽  
Intercept Point

This paper describes a layout of a CMOS Low Noise Amplifier for reconfigurable packages which include GPS, GSM Wi-Fi applications. The improvement of a notably linear Radio front-stop, able to function with Galileo and GPS satellite signals suitable for coexisting in a mobile opposed environment for area based offerings, pleasing the fundamental necessities for a mass market product which includes low cost, low footprint, good accuracy, low strength intake and high sensitivity. primarily based on a wideband enter matching, the LNA stages cowl all band of hobby even as reaching a great change-off between excessive gain, low noise parent and coffee electricity intake. The complete simulation analysis of the circuit results in the frequency range of 1.4 GHz to 2 GHz. The noise figure is 1.8 dB at 1.4GHz and rises to 3.4 dB at 2 GHz. The input return and output return losses (S11, S22) of the LNA at a frequency range between 1.4 GHz and 2 GHz are S11= -12 dB, S22 =-44.73 dB at 1.77 GHz and S22 =-26.47 dB at 2 GHz. The overall gain of the LNA (S21) is 13 dB at 1.4025 GHz, 3rd order input intercept point (IIP3) = -3.16 dBm and -1dB compression point is -12.56 dBm. Input Impedance of 50Ω, 3dB Power Bandwidth of 450MHz, and Power Dissipation of 2.7mW at 1.2V power supply.

scholarly journals A Low-Cost Current Sensor Based on Semi-Cylindrical Magnetostrictive Composite

Electronics ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1833
Author(s):  
Shaoyi Xu ◽  
Qiang Peng ◽  
Fangfang Xing ◽  
Hongyu Xue ◽  
Junwen Sun ◽  
...  
Keyword(s):  
Particle Size ◽  
Epoxy Resin ◽  
Low Cost ◽  
High Sensitivity ◽  
Current Sensor ◽  
Mass Ratio ◽  
Particle Size Range ◽  
Giant Magnetostrictive Material ◽  
Wide Range ◽  
Magnetostrictive Composites

This paper presents the design, fabrication, and characterization of a compact current sensor based on magnetostrictive composites and resistance strain gauges. Firstly, we designed three kinds of current sensors with different structures, in which the shape of the giant magnetostrictive material (GMM) was cuboid, cylindrical, and semi-cylindrical. A set of finite element method (FEM) simulations were performed to qualitatively guide the design of three prototypes of the current sensor. It was determined that the most ideal shape of the GMM was semi-cylindrical. Secondly, Terfenol-D (TD) powder and epoxy resin were mixed to prepare magnetostrictive composites. In this paper, magnetostrictive composites with different particle size ranges and mass ratio were prepared and tested. The results show that the magnetostrictive composites had the best performance when the particle size range was 149–500 μm and the mass ratio of epoxy resin to TD powder was 1:5. Finally, this paper tested the performance of the sensor. The sensitivity, repeatability, and linear working range of the sensor reached 0.104 με/A, 2.51%, and 100–900 A respectively, when only 0.31 g of TD powder was employed. This means that current measurement with low cost, high sensitivity, and wide range was realized.

scholarly journals A Sensitivity-enhanced Fiber Grating Current Sensor Based on Giant Magnetostrictive Material for Large-Current Measurement

Sensors ◽  
2019 ◽  
Vol 19 (8) ◽  
pp. 1755 ◽  
Author(s):  
Shuchao Wang ◽  
Fu Wan ◽  
Hong Zhao ◽  
Weigen Chen ◽  
Weichao Zhang ◽  
...  
Keyword(s):  
High Voltage ◽  
Low Cost ◽  
High Sensitivity ◽  
Power Industry ◽  
Current Sensor ◽  
Fiber Grating ◽  
Online Measurement ◽  
Magnetostrictive Material ◽  
Giant Magnetostrictive Material ◽  
Large Current

Currently, in the modern power industry, it is still a great challenge to achieve high sensitivity and uninterrupted-online measurement of large current on the high voltage gridlines. At present, the fiber grating current sensors based on giant magnetostrictive material used in the modern power industry to achieve uninterrupted-online measurement of large currents on high voltage grid lines is a better method, but the sensitivity of this current sensor is relatively low, therefore, it is key to improve the sensitivity of this current sensor. Here we show a sensitivity-enhanced fiber grating current sensor based on giant magnetostrictive material (in the following, simply referred to as the sensitivity-enhanced fiber grating current sensor) that is able to achieve high sensitivity and uninterrupted-online measurement of large currents by means of pressurizing the giant magnetostrictive material. Sampling the power frequency sinusoidal alternating current signals with the amplitudes of 107, 157 and 262 A respectively, based on realistic factors, for the sensitivity-enhanced current sensor, the sensitivities, compared with that of the traditional fiber grating current sensor based on giant magnetostrictive material (in the following, simply referred to as the traditional fiber grating current sensor), were respectively enhanced by 268.96%, 135.72% and 71.57%. Thus the sensitivity-enhanced fiber grating current sensor allows us to solve the issue of high sensitivity and uninterrupted-online measurement of large currents that have been plaguing the power industry in a very simple and low-cost way.

Study on an innovative self-inductance tension eddy current sensor based on the inverse magnetostrictive effect

Sensor Review ◽  
2017 ◽  
Vol 37 (1) ◽  
pp. 43-53 ◽  
Author(s):  
Chengzhu Xiu ◽  
Liang Ren ◽  
Hongnan Li ◽  
Ziguang Jia
Keyword(s):  
Magnetic Field ◽  
Eddy Current ◽  
Low Cost ◽  
Operating Conditions ◽  
The Self ◽  
Current Sensor ◽  
Data Logger ◽  
Content Type ◽  
Eddy Current Sensor ◽  
Sensor Structure

Purpose Magnetic permeability variations of ferromagnetic materials under elastic stress offer the potential to monitor tension based on the inverse magnetostrictive effect. The purpose of this paper is to propose an innovative self-inductance tension eddy current sensor to detect tension. Design/methodology/approach The effectiveness of conventional elasto-magnetic (EM) sensor is limited during signal detection, due to its complex sensor structure, which includes excitation and induction coils. In this paper, a novel self-inductance tension eddy current sensor using a single coil is presented. Findings The output signal was analyzed through oscilloscope in the frequency domain and via self-developed data logger in the time domain. Experimental results show the existence of a linear relationship between voltage across the sensor and tension. The sensor sensitivity is dependent on operating conditions, such as current and frequency of the input signal. Practical implications The self-inductance sensor has great potential for replacing conventional EM sensor due to its low cost, simple structure, high precision and good repeatability in tension detection. Originality/value A spilt sleeve structure provides a higher permeability path to magnetic field lines than a non-sleeve structure, thus reducing the loss of magnetic field. The self-developed data logger improves sensitivity and signal-to-noise ratio of sensor. The novel sensor, as a replacement of the EM sensor, can easily and accurately monitor the tension force.

Adaptive hybrid control of unbalanced vibrations of a rotor/active magnetic bearing system with coupling misalignment using low cost instrumentation

2019 ◽  
Vol 25 (15) ◽  
pp. 2151-2174
Author(s):  
Rajiv Kumar Vashisht ◽  
Qingjin Peng
Keyword(s):  
Hybrid Control ◽  
Frequency Estimation ◽  
Low Cost ◽  
Active Noise Control ◽  
Notch Filter ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Flexible Rotor ◽  
Adaptive Notch Filter ◽  
Bearing System

An adaptive hybrid controller is proposed for reducing the unbalanced vibration response of a flexible rotor/active magnetic bearing system. It is observed that conventional adaptive feedforward controller (AFFC) normally used in the active noise control is very sensitive in performance for changes in rotor spin frequencies. Although frequency updating is a part of its architecture, a small practical variation in the rotor spin frequency can reduce its effectiveness drastically. A smart combination of adaptive notch filter and Goertzel filter is proposed for the frequency estimation. During changes of the rotor spin frequency, fundamental harmonics of the flexible rotor are excited. By using hybrid controllers that combine feedback control and AFFC, the amplitude of these fundamental harmonics is reduced significantly. By applying the multi-harmonic hybrid control, the multiple harmonics generated due to coupling misalignment are compensated efficiently. Fourier transform of the control signal is further used to detect the presence of the coupling misalignment.

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