Abstract
For large bearing capacity and low current consumption of the magnetic suspension platform, a 2-DOF electromagnetic actuator with a new structure of halbach array is proposed to improve driving force coefficients. The structure and the working principle are introduced. An accurate sub domain model of the new structure is established to accurately and rapidly calculate the magnetic field distribution for obtaining the parameters and performance of the electromagnetic actuators. The analytical model results are verified by the finite element method. The force/torque model of the magnetic suspension platform is established based on the proposed 2-DOF electromagnetic actuator. Three position-sensitive detectors and six accelerometers are applied to perceive in real time the posture and vibration acceleration of the platform, respectively. Their hardware information is introduced and measurement models are established based on the layout. Finally, the electromagnetic characteristics of the proposed actuator are investigated and compared with the conventional counterpart by finite element analysis. The results show that the average magnetic field, 0.432 T, horizontal and vertical force coefficient, 92.3 N/A and 30.95 N/A, and torque in x and z direction, 3.61 N·m and 8.49 N·m, of the proposed actuator are larger than those of the conventional one.
Highlights
Published: 20 January 2022The microgravity environment of space stations has opened up a new frontier for experimental research in materials science, basic physics, life science, and biotechnology [1].the conditions of acceleration-sensitive experiments are usually not satisfied because of the low-frequency and high-frequency micro-vibrations produced by gravity gradients, orbital maneuvers, attitude control, equipment operation, and astronaut activities in the space laboratory [2,3,4,5].For decades, various researchers have made efforts to mitigate the effects of microvibrations [6,7,8]
Proposed a 2-DOF electromagnetic actuator whose vertical and horizontal driving forces are produced through two sets of circuit board conductors perpendicular to each other in the same permanent magnetic field
Different from the conventional structure of halbach array, the auxiliary yokes are added to the end of vertical permanent magnet (PM) to reduce reluctance in the back region and improve airgap magnetic field
Summary
The microgravity environment of space stations has opened up a new frontier for experimental research in materials science, basic physics, life science, and biotechnology [1]. References [2,20] proposed a microgravity vibration isolation mount consisting of eight electromagnetic actuators with three 2-DOF displacement sensors and six accelerometers. Proposed a 2-DOF electromagnetic actuator whose vertical and horizontal driving forces are produced through two sets of circuit board conductors perpendicular to each other in the same permanent magnetic field. In reference [18], the 2-DOF electromagnetic actuator realizes the integration of horizontal and vertical driving forces and large strokes. 2-DOF electromagnetic actuator with an improved structure of halbach array is proposed to improve electromagnetic characteristics It has the merits of high force coefficient and torque output, small volume, large force density, and low driving force fluctuation. To show the merits of the proposed electromagnetic actuators, the structure and performance parameters are compared with the typical one
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