International Journal of Applied Electromagnetics and Mechanics - Volume 63, issue 1

Authors: Pilat, Adam Krzysztof

Article Type: Research Article

Abstract: This elaboration presents an initial study of the elliptic rotor driven by the active magnetic bearing consisting of 6 poles. The analysis was realized using the virtual prototype - a numerical model of device. The model was realized with support of COMSOL Multiphysics software. The proposed geometry, selected materials and configuration were used to perform analysis if the electromagnetic forces and torque are available to drive the rotor of the elliptic shape. The control study is given to obtain a rotational motion for a fixed rotor placement at the bearing center. Numerical simulations were realized to demonstrate features and limitations …of the proposed solution. The solution in a form of Virtual Prototype allows to eliminate prototyping costs and extends the knowledge and dependencies of complex mechatronic systems like active magnetic levitation technology based ones. Show more

Keywords: Active magnetic bearing, elliptic rotor, control, virtual prototype

DOI: 10.3233/JAE-209006

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 63, no. 1, pp. 153-170, 2020

Authors: Zhao, Xingqian | Shuai, Changgeng | Xu, Wei | Chen, Demin | Hu, Zechao

Article Type: Research Article

Abstract: To isolate the vibration transmitted from the propeller to the vessel’s hull, the main engine, the shaft together with the bearings are proposed to be installed on a large-scale isolation system. Permanent magnetic thrust bearing (PMTB) is applied to further reduce the vibration transmission. The Coulombian model is adopted to calculate the force and stiffness, which determine the application feasibility of the PMTB in vessels. Explicit computations are presented for stacked PMTB. The calculation result is compared with that obtained by finite element method (FEM) and experimentally tested. It is revealed that the Coulombian model is accurate enough and more …economic than the FEM, which make it advantageous to the structure design and parameter optimization of PMTB. In the influence study by Coulombian model, it is found that the airgap width can exponentially change the maximum axial magnetic force and stiffness; the radial width is not a sensitive factor for both force and stiffness; the axial length should be 4/5 of the radial thickness to obtain the largest force and decent stiffness. Show more

Keywords: Permanent magnetic thrust bearing, Coulombian model, finite element method, parameter optimization, magnetic force and stiffness

DOI: 10.3233/JAE-209007

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 63, no. 1, pp. 171-186, 2020

Authors: Zhou, Ran | Yan, Mingyin | Guo, Yongquan | Jin, Junjie | Sun, Feng | Zhang, Xiaoyou | Oka, Koichi

Article Type: Research Article

Abstract: A proposed permanent magnetic suspension using flux path control mainly consists of a disk permanent magnet, two pairs of F-shape core and a servo motor, and controls the suspension force by changing flux path, and the load on the motor shaft is eliminated due to its symmetric offset optimal structure to make the motor reach zero power output. In order to verify the robustness of the system under external disturbances, this paper investigates and analyzes its suspension characteristics by using the simulation and the experiment. Firstly, the structure and the suspension principle of the system are introduced. Secondly, the dynamic …model is established, two kinds of controllers of the system are designed with the classic PD control method. Finally, the suspension characteristics of the system are studied through the simulation and the experiment. In the process of the experiment, the system is subjected to small step disturbance or small force disturbance, under the action of the real-time control system. The experimental results show that when the system is subjected to small step disturbance or small force disturbance in the process of the suspension, the suspended object will reach a new equilibrium position under the action of the real-time control system. Show more

Keywords: Permanent magnetic suspension, flux path control, zero power, PD control

DOI: 10.3233/JAE-209008

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 63, no. 1, pp. 187-198, 2020