1. On Effective Electromagnetic Shielding of Modern Pulse Width Modulating Adjustable Speed Drives.
- Author
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Hosseinipour, Milad, Soorki, Mehdi Naderi, and Ahmadian, Mehdi
- Subjects
VARIABLE speed drives ,ELECTROMAGNETIC shielding ,PULSE width modulation ,ELECTROMAGNETIC interference ,CONTACT mechanics ,FINITE element method - Abstract
This paper presents a practical approach toward efficient shielding of adjustable speed drives (ASD). The electromagnetic interference problem affects a complex roller rig testing facility that is developed at the Railway Technologies Laboratory of Virginia Tech. The rig uses a slew of sensitive instruments to study the wheel-rail contact mechanics in the railway applications. Eight ASDs run the rig in close vicinity of the sensors, which heavily affects their measurements. System requirements such as heat management, structural rigidity, size, and cost, restrict additional shielding for these drives. In this paper, a two-dimensional finite element analysis is used to find the proper shielding material, optimum thickness, and aperture size that maximize the shielding effectiveness. Based on the simulation results, an enclosure is fabricated for the VT Roller Rig control tower. Simulation results show that steel exhibits the least sensitivity to perforation, especially at frequencies above \text10 kHz. Results also reveal \text23.4\% difference between \text0.5 and \text3 mm thicknesses at \text1 kHz , while the difference is \text3.5\% at \text5 MHz. Moreover, experimental results demonstrate agreement between the simulated and actual performances. Measurements confirm that using \text16 GA off-the-shelf carbon steel sheets with \text80\% perforation, an average shielding effectiveness of \text40 dB is achieved. [ABSTRACT FROM PUBLISHER]
- Published
- 2018
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