Iranian Journal of Mechanical Engineering Transactions of the ISME

Iranian Journal of Mechanical Engineering Transactions of the ISME

A Hybrid Contactless Air-magnetic Bearing System for Operating at 15,000 rpm

Document Type : Research Paper

Authors
Hossein Barati 1
Mohammad Reza Karafi 2
1 M.Sc., Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
2 Assistant Professor, Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
10.30506/jmee.2024.1990806.1313
Abstract
This paper introduces a Hybrid Air-Magnetic bearing for a two-pole three-phase induction motor. In high-speed machine, contact bearings are not usable. As a result, utilizing non-contact bearings are alternative. Magnetic and air bearings are non-contact types that can be employed independently or together. This study employed a combination of magnetic and air bearings. At first, the system suspended the motor shaft by using air bearings. Then the Magnetic bearings damp the system’s vibrations at high speeds. This Hybrid Air-Magnetic bearing system significantly reduces control and calculation efforts while improving stability, robustness, and reliability at high speeds. The air bearing is used with an air gap of 6 μm and a pressure of 7 bars. Resistance between the shaft and air bearing housing was measured to be 0 in the non-suspended condition, 5 MΩ in the suspended condition at zero speed, and 43 MΩ at 15,000 rpm. At 15,000 rpm, the motor vibrated with an amplitude of 2 μm. The greatest observed acceleration amplitude is 4.5, 4.3, 3.5, and 3.3 m/s2 at 3900, 6900, 10200, and 13800 rpm, respectively.
Keywords
Magnetic bearing
Air bearing
Hybrid
High speed

Subjects

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Iranian Journal of Mechanical Engineering Transactions of the ISME
Volume 25, Issue 2 - Serial Number 43
September 2024
Pages 40-62