An orientation measurement system of the two-DOF permanent magnet spherical motor based on hall ring detectors

Measurement ◽  
2020 ◽  
Vol 150 ◽  
pp. 107073
Author(s):  
Guidan Li ◽  
Jiaxu Feng ◽  
Bin Li ◽  
Hongfeng Li
Keyword(s):  
Permanent Magnet ◽  
Measurement System ◽  
Orientation Measurement ◽  
Spherical Motor

Design and Modeling of a Spherical Actuator with Three Dimensional Orientation Measurement System

2011 ◽  
Vol 317-319 ◽  
pp. 1088-1097 ◽  
Author(s):  
Wei Hai Chen ◽  
Liang Zhang ◽  
Fang Hong Guo ◽  
Jing Meng Liu
Keyword(s):  
Permanent Magnet ◽  
Measurement System ◽  
Three Dimensional ◽  
Design Procedure ◽  
Design Parameters ◽  
Orientation Measurement ◽  
Air Core ◽  
Experimental Works ◽  
High Torque ◽  
Spherical Actuator

This paper presents the design and modeling of a permanent magnet spherical actuator which consists of a rotor with eight cylindrical permanent magnet (PM) poles and a stator with twenty-four air-core coils. Torque and dynamic model of this PM spherical actuator are formulated analytically. An optimal design procedure is proposed to achieve a high torque output, and significant design parameters of the actuator are discussed. As there is no effective method for three dimensional orientation measurement of the spherical actuator currently, a novel orientation measurement system is proposed. Finally, experimental works are carried out, and the experiment results demonstrate the effectiveness of the proposed orientation measurement system.

Effect of Magnet Moving Speed on the Relaxation Rate of the Levitation Force for YBCO Bulk

2007 ◽  
Vol 546-549 ◽  
pp. 2103-2106 ◽  
Author(s):  
X.L. Wu ◽  
W.M. Yang ◽  
S.H. Zhu ◽  
J.Z. Guo ◽  
T.N. Lu ◽  
...  
Keyword(s):  
Relaxation Rate ◽  
Permanent Magnet ◽  
Measurement System ◽  
Levitation Force ◽  
Force Measurement ◽  
Single Domain ◽  
Ybco Bulk ◽  
Optimal Speed ◽  
Force Measurement System ◽  
Moving Speed

The effect of magnet moving speed on the relaxation of the maximum levitation force of YBCO bulk has been investigated. The experiment was carried out between a cylinder permanent magnet and a single-domain YBCO bulk, and the levitation force was measured using a self-made levitation force measurement system. It is found that the levitation force decreases with time after the gap distance between the magnet and YBCO bulk reduced to 2 mm and kept for the test. It is also found that the levitation force and its relaxation rate is different for different moving speed between the magnet and the YBCO bulk, and the higher the moving speed, the greater the relaxation rate of levitation force. However, the largest levitation force is obtained at an optimal speed, the higher the levitation force, and the faster the relaxation of levitation force.

Design and Analysis of a Variable Arc Permanent Magnet Array for Spherical Motor

2013 ◽  
Vol 49 (4) ◽  
pp. 1470-1478 ◽  
Author(s):  
Changliang Xia ◽  
Jianguo Xin ◽  
Hongfeng Li ◽  
Tingna Shi
Keyword(s):  
Permanent Magnet ◽  
Spherical Motor
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