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

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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
  • PM#06 18-19 July 2006
slide2
Antenna Drives Solution
  • 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…”
slide3
AZIMUTH LINEAR MOTOR – DIMENSIONING OPTIMIZATION
  • 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
slide4
ELEVATION LINEAR MOTOR – DIMENSIONING OPTIMIZATION
  • 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
slide5

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
slide6

OPEN POINTS

  • Maximum available EL torque
  • Sectors handlings, in particular for EL
  • Erection attachment points on EL axis, under analysis
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