Analysis of Magnetic Field Characteristics of a Giant Magnetostrictive Actuator with a Semi-Closed Magnetic Circuit
Abstract
:1. Introduction
2. Principles and Methods
2.1. Basic Theory of Model Solving
2.2. COMSOL Multiphysics Finite Element Model Establishment
2.2.1. Finite Element Model
2.2.2. Setting Boundary Conditions and Loads
2.2.3. Meshing
2.2.4. Model Solution and Postprocessing
2.3. Establishing a Coordinate System
2.4. Solving the Cross-Sectional Magnetic Density
3. Results and Discussion
3.1. Simulation Verification
3.1.1. Influence of Displacement Conversion Mechanism on Magnetic Field Distribution Characteristic
3.1.2. Influence of Shell on Magnetic Field Distribution Characteristic
3.1.3. Influence of Air Gap Geometry on Axial Magnetic Density of GMM Cylinder
3.2. Experimental Verification
3.2.1. Experimental System
3.2.2. Comparison between Simulation Results and Experimental Results
4. Conclusions
- (1)
- By increasing the relative permeability of the transfer mechanism, the magnetic field intensity on the GMM cylinder first increased and then decreased, whereas the deviation of the average magnetic field intensity at both ends first decreased and then increased. In order to make the axial magnetic field intensity of the GMM cylinder larger and more uniform, the displacement conversion mechanism should be made of materials with low magnetic permeability.
- (2)
- When the relative permeability of the shell increased, the magnetic field density on the GMM cylinder increased monotonously, and the deviation of magnetic field density at both ends decreased monotonously. In order to make the axial magnetic field intensity of the GMM cylinder large and uniform, the device shell should be made of high-permeability material.
- (3)
- With the increase in air gap size, its constraint on magnetic field lines weakened, the magnetic field density on the GMM cylinder decreased, and the deviation degree of magnetic field density increased. Therefore, in order to improve the utilization efficiency of the excitation magnetic field, the geometric size of the air gap should be reduced as much as possible under the condition of meeting the pretightening force requirements.
- (4)
- The experimental test results showed that the established simulation model can correctly reflect the actual physical characteristics of GMA, and it was also verified that it is feasible to use the averaging method based on magnetic circuit theory to solve the magnetic field intensity of GMM cylinder axial section.
Author Contributions
Funding
Conflicts of Interest
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NO. | Structure Name | Material ur |
---|---|---|
1 | Preload bolt | 2000 |
2 | Upper-end cover | 2000 |
3 | Disc spring | — |
4 | Outer shell | 2000 |
5 | Excitation coil | 1 |
6 | Coil skeleton | 1 |
7 | Air gap | 1 |
8 | GMM cylinder | 20 |
9 | “T” plunger | 10 |
10 | Lower end cover | 2000 |
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Zhou, Z.; He, Z.; Xue, G.; Zhou, J.; Rong, C.; Liu, G. Analysis of Magnetic Field Characteristics of a Giant Magnetostrictive Actuator with a Semi-Closed Magnetic Circuit. Actuators 2022, 11, 108. https://doi.org/10.3390/act11040108
Zhou Z, He Z, Xue G, Zhou J, Rong C, Liu G. Analysis of Magnetic Field Characteristics of a Giant Magnetostrictive Actuator with a Semi-Closed Magnetic Circuit. Actuators. 2022; 11(4):108. https://doi.org/10.3390/act11040108
Chicago/Turabian StyleZhou, Zhaoqi, Zhongbo He, Guangming Xue, Jingtao Zhou, Ce Rong, and Guoping Liu. 2022. "Analysis of Magnetic Field Characteristics of a Giant Magnetostrictive Actuator with a Semi-Closed Magnetic Circuit" Actuators 11, no. 4: 108. https://doi.org/10.3390/act11040108
APA StyleZhou, Z., He, Z., Xue, G., Zhou, J., Rong, C., & Liu, G. (2022). Analysis of Magnetic Field Characteristics of a Giant Magnetostrictive Actuator with a Semi-Closed Magnetic Circuit. Actuators, 11(4), 108. https://doi.org/10.3390/act11040108