• Title, Summary, Keyword: Slim tower

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A Study of the Slim Design of Overhead Transmission Tower (가공송전철탑 경량화 설계에 관한 연구)

  • Lee, Jung-Won;Lee, Won-Kyo
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.23 no.7
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    • pp.560-565
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    • 2010
  • This paper presents the design factor of an overhead transmission tower structure in order to reduce the tower weight. The behaviour of transmission tower structures are affected by the horizontal angle of the tower structure, the equivalent wind pressure group, the slope of the main post of the tower, the separation of the internode and the use of high-strength materials in their construction. Tower weight can be reduced by approximately 30% reduce weight by means of optimal design based on a consideration of all the above factors. In addition, the design of the foundation of the tower with the shear key installation to increase horizontal support together with a modified angle of inclination to the ground can reduce by about 37% the amount of concrete used during construction. The area of ground disturbed by the construction of the tower foundation can thus be reduced by approximately 33%. Therefore it is possible to build an environmently-friendly T/L tower with the mechanical properties of existing towers.

Semi-continuous beam-to-column joints at the Millennium Tower in Vienna, Austria

  • Huber, Gerald
    • Steel and Composite Structures
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    • v.1 no.2
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    • pp.159-170
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    • 2001
  • The Millennium Tower is situated to the north of the center of Vienna. With a height of 202 m it is the highest building in Austria. Realization was improved by new methods. The tower is a typical example of mixed building technology, combining composite frames with a concrete core. Special attention has been paid to the moment connections between the slim floors and the column tubes resulting in a drastically reduced construction time and thin slabs. The semi-continuity has been considered in the design at ultimate and serviceability limit states.

A Study on the Speed Control of PMSM for Elevator Drive (엘리베이터구동용 영구자석형 동기전동기의 속도제어에 관한 연구)

  • Yu J.S.;Kim L.H.;Choi G.J.;Yoon K.C.;Jung M.T.;Kim Y.C.;Lee S.S.;Won C.Y.
    • Proceedings of the KIPE Conference
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    • pp.461-466
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    • 2003
  • This paper presents the speed control of the surface-mounted permanent-magnet synchronous motors (SMPMSM) for the elevator drive. The elevator motor needs to be a compact and slim type. Essentially, the proposed scheme uses a vector control algorithm for a speed and torque control. This system is implemented using a high speed 32-bit DSP (TMS320C31-50), a high-integrated logic device FPGA (EPF10K10-Tl144-3) to design compactly and Inexpensively The proposed scheme is verified through digital simulation and experiments for a three-phase 13.3kW SMPMSM as a MRL(MachineRoomless) elevator motor ill the laboratory. Finally, experiment of the test tower was performed with a 48kW PWM converter-inverter system for a high- speed elevator .

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