scholarly journals Study on Multi-DOF Actuator for Improving Power Density

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4204
Author(s):  
Sooyoung Cho ◽  
Ho Joon Lee ◽  
Ju Lee
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stability Analysis ◽  
Low Power ◽  
Power Density ◽  
Eddy Current ◽  
Pitch Angle ◽  
Eddy Current Loss ◽  
Element Analysis ◽  
Output Characteristics

This study focuses on improving the power density of a spherical multi-degree-of-freedom (multi-DOF) actuator. A spherical multi-DOF actuator that can operate in three DOFs is designed. The actuator features a double air gap to reduce eddy current loss. However, a multi-DOF actuator driven by a single actuator exhibits low power density. Therefore, a Halbach magnet array is applied to improve the power density of a spherical multi-DOF actuator, and its output characteristics are compared with those of an existing spherical multi-DOF actuator via finite element analysis. Additionally, the output characteristics are analyzed based on changes in the coil pitch angle and magneto-motive force of the rotating winding. Furthermore, it is necessary for a spherical multi-DOF actuator to move to the command position. Hence, a stability analysis is performed to ensure that the spherical multi-DOF actuator is stably driven based on the command position.

Finite Element Analysis of AMB Eddy-Current Loss in HTR-PM Primary Helium Circulator

2018 ◽  
Author(s):  
Jinpeng Yu ◽  
Yan Zhou ◽  
Mo Ni ◽  
Guojun Yang ◽  
Lei Zhao
Keyword(s):  
Magnetic Field ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Eddy Current ◽  
Electromagnetic Force ◽  
Eddy Current Loss ◽  
Element Analysis ◽  
Current Loss ◽  
Resistance Torque ◽  
Current Magnetic Field

In the active magnetic bearing (AMB) system, the eddy current is generated during the rotation of the rotor, which brings about the AMB loss and eddy-current magnetic field. The eddy-current magnetic field will reduce the electromagnetic force and generate the resistance torque of the AMB. Basing on the AMB of the Primary Helium Circulator (PHC) in HTR-PM, two-dimensional (2D) and three-dimensional (3D) AMB models are built and analyzed with finite element analysis (FEA) in maxwell. The 2D FEA shows that the eddy-current loss and the resistance torque increase as the rotor speed increases, and the eddy-current magnetic field will affect the air-gap magnetic field and reduce the electromagnetic force. The 3D FEA shows that dividing the rotor in insulate sheets can reduce the eddy-current loss. The loss and the sheets thickness have a linear relationship, which is different from the theoretical analysis.

scholarly journals A Combined Experimental and Finite Element Analysis Method for the Estimation of Eddy-Current Loss in NdFeB Magnets

Sensors ◽  
2014 ◽  
Vol 14 (5) ◽  
pp. 8505-8512 ◽  
Author(s):  
Radu Fratila ◽  
Abdelkader Benabou ◽  
Abdelmounaïm Tounzi ◽  
Jean-Claude Mipo
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Eddy Current ◽  
Eddy Current Loss ◽  
Analysis Method ◽  
Element Analysis ◽  
Ndfeb Magnets ◽  
Current Loss ◽  
Finite Element Analysis Method

Finite Element Analysis for the Stiffness and the Buckling of Corrugated Tubes in Heat Exchanger

2012 ◽  
Vol 468-471 ◽  
pp. 1675-1680 ◽  
Author(s):  
Xiao Jing Wang ◽  
Zhi Min Wang ◽  
Nian Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stability Analysis ◽  
Heat Exchanger ◽  
Heat Exchangers ◽  
External Pressure ◽  
Element Analysis ◽  
Value Analysis ◽  
Compressive Pressure ◽  
The Stability

Corrugated tubes in a heat exchanger are analyzed by using the FEA methods. And the formula how to compute single wave’s rigidity is obtained. Besides, methods of analyzing the stability of corrugated tubes under internal compressive pressure and external pressure are proposed which include characteristic value analysis and non-linear stability analysis, thus providing theory basis for the stability research of heat exchangers.

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