Design and control of a micro-mass measurement system employing permanent magnet repulsive-type magnetic bearing

2007 ◽  
Vol 181 (1-3) ◽  
pp. 142-147 ◽  
Author(s):  
Alaa A. Hussien ◽  
Sotoshi Yamada ◽  
Masayoshi Iwahara ◽  
Takahisa Ohji
Keyword(s):  
Permanent Magnet ◽  
Measurement System ◽  
Mass Measurement ◽  
Magnetic Bearing ◽  
And Control

scholarly journals AIR PRESSURE CONTROLLED MASS MEASUREMENT SYSTEM

2013 ◽  
Vol 24 ◽  
pp. 1360002
Author(s):  
RUILIN ZHONG ◽  
JIAN WANG ◽  
CHANGQING CAI ◽  
HONG YAO ◽  
JIN'AN DING ◽  
...  
Keyword(s):  
Measurement System ◽  
Pressure Range ◽  
Mass Measurement ◽  
Air Pressure ◽  
Air Density ◽  
Airtight Chamber ◽  
And Control ◽  
Automatic Mass ◽  
Pressure Controlled ◽  
Control Part

Mass measurement is influenced by air pressure, temperature, humidity and other facts. In order to reduce the influence, mass laboratory of National Institute of Metrology, China has developed an air pressure controlled mass measurement system. In this system, an automatic mass comparator is installed in an airtight chamber. The Chamber is equipped with a pressure controller and associate valves, thus the air pressure can be changed and stabilized to the pre-set value, the preferred pressure range is from 200 hPa to 1100 hPa. In order to keep the environment inside the chamber stable, the display and control part of the mass comparator are moved outside the chamber, and connected to the mass comparator by feed-throughs. Also a lifting device is designed for this system which can easily lift up the upper part of the chamber, thus weights can be easily put inside the mass comparator. The whole system is put on a marble platform, and the temperature and humidity of the laboratory is very stable. The temperature, humidity, and carbon dioxide content inside the chamber are measured in real time and can be used to get air density. Mass measurement cycle from 1100 hPa to 200 hPa and back to 1100 hPa shows the effective of the system.

Commissioning and Control of the AMB Supported 3.5 kW Laboratory Gas Blower Prototype

2013 ◽  
Vol 198 ◽  
pp. 451-456 ◽  
Author(s):  
Rafał P. Jastrzębski ◽  
Alexander Smirnov ◽  
Katja Hynynen ◽  
Janne Nerg ◽  
Jussi Sopanen ◽  
...  
Keyword(s):  
Control System ◽  
Permanent Magnet ◽  
Induction Motor ◽  
Industrial Applications ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Sensor Calibration ◽  
Full Potential ◽  
Disturbance Analysis ◽  
And Control

This paper presents the practical results of the design analysis, commissioning, identification, sensor calibration, and tuning of an active magnetic bearing (AMB) control system for a laboratory gas blower. The presented step-by-step procedures, including modeling and disturbance analysis for different design choices, are necessary to reach the full potential of the prototype in research and industrial applications. The key results include estimation of radial and axial disturbance forces caused by the permanent magnet (PM) rotor and a discussion on differences between the unbalance forces resulting from the PM motor and the induction motor in the AMB rotor system.

A novel permanent magnet bias hybrid thrust magnetic bearing with extremely simple structure for high-speed rotating machinery

2021 ◽  
pp. 095440622110483
Author(s):  
Haoze Wang ◽  
Zhigang Wu ◽  
Kun Liu ◽  
Jingbo Wei ◽  
Hongjing Hu
Keyword(s):  
Permanent Magnet ◽  
Analytical Model ◽  
High Speed ◽  
Magnetic Force ◽  
Simple Structure ◽  
Magnetic Bearing ◽  
Rotating Machinery ◽  
Structure Complexity ◽  
And Control ◽  
Thrust Magnetic Bearing

This paper presents a novel permanent magnet (PM) bias hybrid thrust magnetic bearing (HTMB), which can be used to replace the traditional thrust magnetic bearings (TMBs) for high-speed rotating machinery. By adding two PM rings and by reducing the number of the control coils by half, this HTMB eliminates the bias current, reduces the number of amplifiers, and minimizes the magnetic bearing’s structure complexity and power consumption. The analytical modelling method of the HTMB is presented in this paper. Mathematical models for calculating the magnetic force capacity and the stiffnesses of this bearing are derived as simplified formulae, which can be used for the design, analysis, and control of this bearing. Electromechanical characteristics of the HTMB are analyzed, which is compared to the traditional TMB to demonstrate the advantages of the HTMB. The prototype of the HTMB is designed, analyzed, and fabricated, whereas, the 2-D FEM is used to verify the design and the analytical model. Finally, an experimental setup is constructed and tested. The analytical and experimental results indicate that the proposed novel topology of this HTMB is feasible and the presented analytical model is accurate.

The effect of permanent magnet position on axial and radial load capability in axial hybrid magnetic bearing

2020 ◽  
pp. 1-19
Author(s):  
Yunpeng Zhang ◽  
Houfu Wang ◽  
Shuning Gao ◽  
Shuqin Liu
Keyword(s):  
Permanent Magnet ◽  
Magnetic Force ◽  
Magnetic Levitation ◽  
Load Capacity ◽  
Magnetic Bearing ◽  
Radial Load ◽  
Magnetic Circuits ◽  
Radial Magnetic Force ◽  
Magnetic Levitation System ◽  
And Control

The axial and radial load capacity of axial hybrid magnetic bearing (HMB) is critical for the magnetic levitation system. In this paper, the effect of permanent magnet (PM) position on axial and radial magnetic force and stiffness in axial HMB is investigated. Six different configurations are considered and the equivalent magnetic circuits of HMBs for each configuration is built and studied based on the distribution of magnetic field and magnetic leakage. The dependence of axial and radial magnetic force and stiffness on the axial displacement, radial displacement and control current is calculated and investigated for different configurations. To validate the calculated results, the axial and radial magnetic forces for each configuration are simulated by finite element method. A good agreement between the calculated and simulated results validated the proposed magnetic circuit models.

Development of an axial-flux self-bearing motor using two permanent magnet attractive type passive magnetic bearings

2020 ◽  
Vol 64 (1-4) ◽  
pp. 827-833
Author(s):  
Satoshi Ueno ◽  
Masaya Tomoda ◽  
Changan Jiang
Keyword(s):  
Control System ◽  
Permanent Magnet ◽  
Simple Structure ◽  
Control Method ◽  
Rotation Speed ◽  
Magnetic Bearing ◽  
Magnetic Bearings ◽  
Axial Flux ◽  
And Control ◽  
Thrust Magnetic Bearing

This paper introduces an axial-flux self-bearing motor (ASBM) using two permanent magnet attractive type passive magnetic bearings (PMBs). The ASBM provides both functions of a disc motor and thrust magnetic bearing, and controls motor torque and axial force by single rotational magnetic flux. The PMB consists of a cylindrical permanent magnet and an iron shaft with conical edge, and it supports the rotor in radial directions. This motor has a simple structure and control system, and it is possible to reduce the size and cost. In this paper, the structure and control method are introduced, and the results of levitation and rotation tests whose non-contact rotation speed was achieved up to 1,500 rpm are shown.

scholarly journals A Repulsive-Type Magnetic Bearing Micro-Mass Measurement System and Measurement of Resolution

2004 ◽  
Vol 4 (2) ◽  
pp. 51-55
Author(s):  
A. Hussien ◽  
T. Okada ◽  
T. Ohji ◽  
S. Yamada ◽  
M. Iwahara
Keyword(s):  
Measurement System ◽  
Mass Measurement ◽  
Magnetic Bearing

The Finite Element Analysis in Measurement System of Airplane Fuel Mass

2011 ◽  
Vol 301-303 ◽  
pp. 147-152
Author(s):  
Xiu Wu Sui ◽  
Xiao Guang Qi ◽  
Da Peng Li ◽  
Guo Xiong Zhang ◽  
Yu Ming Fan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Measurement System ◽  
Mass Measurement ◽  
Element Analysis ◽  
Fuel Mass ◽  
The Finite Element Analysis ◽  
Level Sensor ◽  
Level Meter ◽  
Fuel Level

The paper presents the measurement system of the air plane fuel mass consisting of cylinder shell resonating density meter and double cylinders capacitance level meter. The finite element analysis method of ANSYS10.0 is used to analyze the performance of cylinder shell resonator density meter and double cylinders capacitance fuel level sensor. On the base of simulation, the cylinder shell is 45mm in length, 9mm in radius, and 0.08mm in thickness, the material is 3J53; the double cylinders capacitance is 8mm in inside diameter, 23.6mm in outside diameter, and 550 mm in length. The experiments show the uncertainty of cylinder shell resonating density meter is only 0.12%, the uncertainty of double cylinders capacitance level meter is only 0.2%, and the uncertainty of the fuel mass measurement system is 0.4%.

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