Technical Briefs

Advanced Magnetic Suspension and Balance System Having Characteristics of Light Weight, Electric Power Saving, and Fast Response

[+] Author and Article Information
Y. Kawamura

 Department of Intelligent Mechanical Engineering, Faculty of Engineering, Fukuoka Institute of Technology, 3-30-1, Wajirohigashi, Higashiku, Fukuoka 811-0295, Japankawamura@fit.ac.jp

T. Mizota

 Department of Intelligent Mechanical Engineering, Faculty of Engineering, Fukuoka Institute of Technology, 3-30-1, Wajirohigashi, Higashiku, Fukuoka 811-0295, Japan

J. Dyn. Sys., Meas., Control 134(4), 044502 (May 07, 2012) (7 pages) doi:10.1115/1.4005366 History: Received July 27, 2010; Revised August 08, 2011; Published May 04, 2012; Online May 07, 2012

We have developed an advanced magnetic suspension and balance system (MSBS), in which iron yokes are not used and a pair of strong magnets are installed to generate magnetic force compensating gravitational force applied to the aerodynamic models. By the introduction of these strong magnets, the electric power saving was realized. By not using iron yokes, not only the weight saving was realized but also the electrical response speed was increased due to the reduction of the inductance of the magnetic coils. The test section of the MSBS is 36 cm × 40 cm. We have developed the control method to support the model and give an arbitral movement of small amplitude at the center of the test section around five axes. In order to evaluate the characteristics of this MSBS, we performed the calibration tests of magnetic forces for our MSBS. We measured drag coefficients of a sphere aerodynamic model in order to confirm the performance of these MSBSs and had good agreements between the measured values and the values appeared in the common aerodynamic hand book. The MSBS has been studied and used in large scale laboratories. We think that these experimental results make the application of the MSBS into the wind tunnel experiment easier and can be the trigger to popularize it in small laboratories.

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 1

Experimental system of the five axes MSBS

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Figure 2

Front and side views of the five axes MSBS. (LD: laser diode, BS: beam splitter, PD: photo detector, 4PD: four segmented photo detector)

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Figure 3

Optical position and attitudes detection system for the five axes MSBS

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Figure 4

Calibration of the z position sensor

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Figure 5

Calibration of the detection of x and y positions. ((a): x position, (b): y position)

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Figure 6

Positions of eight coils and a pair of permanent magnets, directions of five axes and the numbers of coils

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Figure 7

Typical step responses of the five axes MSBS ((a): z axis, (b): y axis, (c): θ x axis)

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Figure 8

Typical calibration result between the load and the coil current (calibration of the x axis)

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Figure 9

Interference between y axis and the other four axes

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Figure 10

Five axes MSBS set at the test section of a wind tunnel

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Figure 11

Levitation of a sphere model having a diameter of 70 mm in the five axes MSBS

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Figure 12

Coil current for y axis as a function of the wind velocity in the measurement of the drag coefficient of the sphere aerodynamic model using the five axes MSBA

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Figure 13

Drag coefficients of the sphere model as a function of Reynolds number measured by the five axes MSBS. (Solid squares: experimental results by the MSBS, open squares: data from JSME handbook [9])



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