Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas
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Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas MAIN AXES DRIVES - PowerPoint PPT Presentation


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Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas MAIN AXES DRIVES PM#06 18-19 July 2006. Antenna Drives Solution Linear Direct Drives Motors Performances :

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Design manufacture transport and integration on site in chile of alma antennas main axes drives


Design manufacture transport and integration on site in chile of alma antennas main axes drives

  • Antenna Drives Solution Chile of ALMA Antennas

  • Linear Direct Drives

  • Motors Performances:

  • (*) Corresponding “ to drive the antennas to stow in a rainfall rate of 2 cm/hr, with a snow accumulation of 50kg/m2 in the reflector…”

  • (**) Corresponding “ to drive the antennas to stow in a rainfall rate of 2 cm/hr, with a snow accumulation of 41kg/m2 in the reflector…”


Design manufacture transport and integration on site in chile of alma antennas main axes drives

  • UPDATE DESIGN LINES

  • Axial room increased up to 320°

  • Increase of sector dimension

  • Reduction of sectors quantity

  • Drive amplifiers on board

  • AC/DC power supply on cabinet

  • Increase of protection degree IP w.r.t. Prototype


Design manufacture transport and integration on site in chile of alma antennas main axes drives

  • UPDATE DESIGN LINES

  • Lateral room increased up to 49°

  • Increase of sector dimension

  • Reduction of sectors quantity

  • Drive amplifiers on board

  • AC/DC power supply on cabinet


Design manufacture transport and integration on site in chile of alma antennas main axes drives

Main implementations in order to increase torque performances

  • Optimization of wiring (losses reduction)

  • Analysis of possible substitution of PTC sensors system

  • Increase of IP protection degree on AZ axis

  • Optimized electronic solution (Drive on board) with

    • Only DC bus from power supply unit (on switchboard) to sectors

    • Reduction of EMC and harmonics/resonances (possible over-voltages disturbances)

    • Increase availability of system


Design manufacture transport and integration on site in chile of alma antennas main axes drives

OPEN POINTS performances

  • Maximum available EL torque

  • Sectors handlings, in particular for EL

  • Erection attachment points on EL axis, under analysis