Minutes BWS Upgrade: Electro-Mechanical Design Meeting #2 -- 24th July 2015 --

Participants: Bernd Dehning, Raymond Venness, Dmitry Gudkov, Jonathan Emery, Pierre-Jean Lapray, Luca Timeo, Jose Luis Sirvent

Agenda ( http://indico.cern.ch/event/435233/ ) :

1. Communications

  • The new optical disk fixation has been tested, observed imperfections on holder, the piece needs to be re-machined.

2. Follow-up Open Actions

  • No remarks on follow-up open actions

3. Motor Selection (D.Gudkov)

  • From 6 Companies contacted for motor procurement 3 are interested (Alxion, Kollmorgen, Parker)
  • Quotation from Alxion and Kollmorgen available, waiting for Parker quotation.

  • 4 Possible motors compliant with our specifications
    • Alxion: 14S5TX2M (short) & 14S5TK4M (long)
    • Kollmorgen: KBM-35x02
    • Parker: NK620

  • Motors delivery times (needed to consider holidays):
    • Off the shelf à 7 Weeks
    • Custom models à 10 Weeks

  • Main Differences Custom vs Standard:
    • Saladium Cobalt magnets (and it’s fixation for vacuum compatibility, no glue)
    • Increasement of Air Gap by machining stator (0.5 to 0.7 mm = 10 to 20% torke decreasement “ETEL”)

  • Open question: Spares politicy?
    • Buy a big amount of spares once VS Trust on companies availability guarantee
    • All contacted companies are relatively “Big”, production guaranteed for many years
    • Decision not taken here.

4. Electrical Requirements and test setups (J.Emery)

  • Motor Study:
    • Motor 14S5TK4M (long) deeply studied by Jonathan in terms of torke, speed and performance for SPS, LHC and PSB.
    • This motor would experience acceleration issues for the LHC configuration .
    • Longer active length improves torke.
    • Exist two versions of this motor (For torke and for Speed).
    • This motor is not suitable for 200rad/s , no torke is achieved at this speed, meaning that constant speed is not guaranteed. However, 140rad/s would be fine (but it’s slowlier than specified for the BWS).
    • The motor consists on 12 poles (Initial Parker motor had only 4), which means higher di/dt variations, moreover it has a very high inertia.

  • Requirements:
    • BWS Prototype:
      • A mechanical piece is needed to keep the shaft in “Home position”, acting as angular reference to align properly the fork, motor stator/rotor, resolver, break and optical disk.
    • BWS Calibration Bench:
      • Both Linear stages must be on the same orientation
      • System needs to be properly aligned horizontally (to work on a table)
      • Fixation of optical parts needs to be defined.
      • Design needs to be reviewed Jonathan & Mechanics
      • Proposed the usage of two flanges with identical holes to align Laser system.

5. Test Planning (B.Dehning)

  • No remarks on test planning

6. AOB

  • Discussion:
    • New Optical disk:
    • New disk sent in September to CERN (a little sample to check quality)
    • Possibility of testing the reflectivity of such disk with the real optical system.
    • Check investigations on disks with micro holes.

  • Decissions:
    • 2 Off the shelf motors + 2 Custom motors to be purchased: Alxion 14S5TX2M & Kollmorgen KBM-35x02.
    • Integration with Alxion 14S5TX2M .
    • Two test-benches as flexible as “Juan model” needs to be built.
    • Tests with original motors and stator machined (bigger air gap) motors to be done

  • New Actions:
Action Asigned to:
Investigations on optical alignment (flanges with holes) William/Jonathan
Revision of BWS calibration system
Communication with RF Bernd
Ordering Motors Dmitry
Test-Benches construction
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Topic revision: r1 - 2015-07-30 - unknown
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