Rotor Displacement Self-Sensing Approach for Permanent Magnet Biased Magnetic Bearings Using Double-Axis PWM Demodulation

2018 ◽  
Vol 18 (19) ◽  
pp. 7932-7940 ◽  
Author(s):  
Yinxiao Jiang ◽  
Xin Ma ◽  
Yahong Fan
Keyword(s):  
Permanent Magnet ◽  
Magnetic Bearings

Passive Magnetic Bearings: Low Instability and Possible Stability

2005 ◽  
Author(s):  
R. Bassani ◽  
E. Ciulli
Keyword(s):  
Permanent Magnet ◽  
Magnetic Bearings ◽  
Static Instability ◽  
Static Conditions

Permanent magnet bearings and systems offer negligible friction and no wear, but static instability too. Nevertheless, spaces of low static instability exhist, and stability may be possible in non static conditions.

Design and analysis of a high speed double-sided axial flux permanent magnet motor suspended vertically by magnetic bearings

2020 ◽  
pp. 1-15
Author(s):  
Ömer Faruk Güney ◽  
Ahmet Çelik ◽  
Ahmet Fevzi Bozkurt ◽  
Kadir Erkan
Keyword(s):  
Permanent Magnet ◽  
High Speed ◽  
Permanent Magnets ◽  
Mechanical Analysis ◽  
Magnetic Bearings ◽  
Permanent Magnet Motor ◽  
Axial Flux ◽  
Element Analysis ◽  
Shaft System ◽  
Rotor Disk

This paper presents the electromagnetic and mechanical analysis of an axial flux permanent magnet (AFPM) motor for high speed (12000 rpm) rotor which is vertically suspended by magnetic bearings. In the analysis, a prototype AFPM motor with a double-sided rotor and a coreless stator between the rotors are considered. Firstly, electromagnetic analysis of the motor is carried out by using magnetic equivalent circuit method. Then, the rotor disk thickness is determined based on a rotor axial displacement due to the attractive force between the permanent magnets placed on opposite rotor disks. Hereafter, an analytical solution is carried out to determine the natural frequencies of the rotor-shaft system. Finally, 3D finite element analysis (FEA) is carried out to verify the analytical results and some experimental results are given to verify the analytical and numerical results and prove the stable high-speed operation.

Development of Permanent Magnet Biased Magnetic Bearings and Application

2011 ◽  
Vol 2011 (0) ◽  
pp. 9
Author(s):  
Yohji OKADA ◽  
Ryou Kondo ◽  
Ken-ichi MATSUDA ◽  
Masato ENOKIZONO
Keyword(s):  
Permanent Magnet ◽  
Magnetic Bearings

A New Structure for Permanent-Magnet-Biased Axial Hybrid Magnetic Bearings

2009 ◽  
Vol 45 (12) ◽  
pp. 5319-5325 ◽  
Author(s):  
Fang Jiancheng ◽  
Sun Jinji ◽  
Xu Yanliang ◽  
Wang Xi
Keyword(s):  
Permanent Magnet ◽  
Magnetic Bearings

scholarly journals Permanent magnet thrust bearings for flywheel energy storage systems: Analytical, numerical, and experimental comparisons

2019 ◽  
Vol 233 (15) ◽  
pp. 5280-5293
Author(s):  
Nikolaj A Dagnaes-Hansen ◽  
Ilmar F Santos
Keyword(s):  
Energy Storage ◽  
Permanent Magnet ◽  
Storage Systems ◽  
Magnetic Suspension ◽  
Magnetic Bearings ◽  
Active Magnetic Bearings ◽  
Flywheel Energy Storage ◽  
Energy Storage Systems ◽  
Thrust Bearings ◽  
Stiffness And Damping

A new type of flywheel energy storage system uses a magnetic suspension where the axial load is provided solely by permanent magnets, whereas active magnetic bearings are only used for radial stabilization. This means that the permanent magnet bearing must provide all the axial damping. Furthermore, it must have as low a negative radial stiffness as possible to reduce the workload on the radial active magnetic bearings. Many different mathematical models for determining force, stiffness, and damping of permanent magnet bearings are available in the literature. This work will further develop the most applicable analytical and numerical methods in order to make them directly implementable for designing permanent magnet thrust bearings for flywheel energy storage systems. The outcome is a fast and efficient method for determining force, stiffness, and damping when the bearing setup contains magnetic materials with relative permeability higher than one as well as when it does not. The developed method is validated against numerical and experimental results with good agreement.

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