• Title/Summary/Keyword: Rotor brake system

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Measurement of Mass Transfer from Metal Friction Surfaces using Laser Plasma Spectroscopy (레이저 플라즈마 분광 기법을 이용한 금속 마찰 표면에서 물질전달 측정)

  • Yoon, Sangwoo;Kim, Jihoon;Kim, Joohan
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.16 no.4
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    • pp.46-52
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    • 2017
  • We quantitatively measured the mass transfer from friction surfaces, specifically brake pads and rotors, using laser plasma spectroscopy. Specifically, we modelled the mass transfer from the pad to the rotor and measured the elemental diffusion intensity distribution in the rotor material using laser plasma spectroscopy. The main elements measured were Cu, Ni, Ti, and Cr, and the distribution of these after transfer was measured as the ratio of the atomic peak and the ion peak of the plasma in the rotor exposed to friction and the surface composition of the rotor and the roughness, respectively. We measured and quantified the diffusion coefficient for each element through the mass transfer model and found that Cr obtained the largest diffusion coefficient (D) of the elements measured based on this system with a value of $1.9484{\times}10^{-15}m^2/s$.

Study on Scoring of Hypoid Gear Set in Bus with Retarder (리타더 장착 버스 하이포이드 기어의 스코링에 관한 연구)

  • Yang, J.H.;Kim, Y.J.
    • Journal of Power System Engineering
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    • v.13 no.6
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    • pp.102-109
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    • 2009
  • A retarder, as a supplementary brake system that is not friction-based, is frequently used in heavy-duty vehicles generally to slow the vehicles down on inclines. The electric retarder mainly used in a heavy-duty bus is generally placed between the transmission and the axle. The rotor inside the retarder system is attached to the axle. The operation of the retarder within a driven vehicle generates reverse torque due to coast driving force on hypoid gears in the differential gear system. By the reverse torque, scoring or scuffing on the hypoid gear teeth may directly occur. The scoring may be generated due to excessive contact stresses on the tooth surface. In this study, tooth contact stresses and contact patterns were analysed in order to investigate on the tooth scoring phenomenon using a finite element analysis program T900 in which the Hertzian contact stress formula was taken. Backlash, wear and surface finish were considered in the finite element simulation on the scoring.

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A study on the characteristics of eddy current braking torque with electromagnet exciting (전자석을 이용한 와전류 제동기의 제동 특성에 관한 연구)

  • Kim, Cherl-Jin;Lee, Kwan-Yong;Kim, Yong-Ha;Han, Kyoung-Hee;Baek, Soo-Hyun
    • Proceedings of the KIEE Conference
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    • 2002.07b
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    • pp.906-908
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    • 2002
  • The technical improvement of servo system, it is required to study on robust control method in company. It needs to study on brake system that has constant torque-speed performance as load variation. In this paper, braking torque characteristics of eddy current braker between electromagnet stator and rotating disk are analyzed. The torque-speed characteristics and proper disk construction are presented. From the computer simulation results, it was found that eddy current braking torque is linear or approximately constant over the desired speed range depending on the rotor material, disk construction, pole number and pole displacement of stator. The relationship of these parameters are confirmed by experimental result.

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Study on Thermoelastic Instability of Automotive Disc Brakes (자동차용 디스크 브레이크의 열탄성 불안정성에 관한 연구)

  • Choi, Ji-Hoon;Kim, Do-Hyung;Lee, In
    • Journal of KSNVE
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    • v.11 no.2
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    • pp.315-322
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    • 2001
  • This paper is focused on the frictionally induced thermoelastic instability (TEI) in automotive disk brakes. This instability leads to the formation of localized high temperature contact regions known as hot spots. This article investigates the themoelastic instability in automotive disk brake systems consisting of a finite thickness layer (disk) and two half-planes (pads) using a perturbation method. The antisymmetric mode involves hot spots located alternately on two sides of the disk. As a result the circumferentially periodic hot spots produce rotor surface distortion and Induce low frequency vibration. Also the effects of system parameters on the critical speed for TEI are investigated.

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A Study on the Structure of Hybrid Magnetic Gear with Armature Type Rotor (전기자 형태의 회전자를 갖는 하이브리드 마그네틱 기어의 구조에 관한 연구)

  • Gim, Chan-Seung;Park, Eui-Jong;Kim, Yong-Jae
    • The Journal of the Korea institute of electronic communication sciences
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    • v.13 no.6
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    • pp.1235-1242
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    • 2018
  • When the wind speed changes rapidly, the wind turbine is stopped for the safety of the power system and the mechanical system. At that moment, the wind turbine gearbox is damaged and broken due to the contact load of the gearbox. In addition, the problems such as increasing frictional heat and deteriorate of the brake occur, because the power of the blades is transmitted directly to the brakes. This paper proposes a hybrid magnetic gear shape that solves the problem caused by the contact of the mechanical gear, which is the power transmission device of the wind power generation system, and the power cutoff system. The shape of the hybrid magnetic gearsuitable for the wind power generation system is derived through the torque and loss analysis according to the shape of the hybrid magnetic gear by using the two dimensional finite analysis method.