1 / 18

Merlin EPU Support and Drive System Design Review

Merlin EPU Support and Drive System Design Review. Steve Marks Mark Coleman 4/26/06. Scope of Review - Mechanical System. Frame – Deflection Bearings and Mounts Deflection Load Rating Drive Screws – Load Rating Backing Beams Motor Torques. Other Reviews. Magnetic structure – 2/2/06

chas
Download Presentation

Merlin EPU Support and Drive System Design Review

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Merlin EPU Support and Drive System Design Review Steve Marks Mark Coleman 4/26/06

  2. Scope of Review- Mechanical System • Frame – Deflection • Bearings and Mounts • Deflection • Load Rating • Drive Screws – Load Rating • Backing Beams • Motor Torques

  3. Other Reviews • Magnetic structure – 2/2/06 • Motor Control System – TBD? • Sector 4 EPBI – TBD • APRP • Scope • Installation Readiness

  4. EPU90 vs. EPU50 EPU50 (old) EPU90 (new)

  5. EPU90 vs. EPU50 EPU90 (new) EPU50 (old)

  6. What is New? • 90mm Period (three previous EPUs are50mm) • Separate mounting of block/keepers • Avoid correlated motion causing shift dependent skew quad • Modified backing beam • Bearings closer to load • Horizontal drive closer to load • Steel backing beam • Stiffer Frame • To accommodate ~ 2.3 vertical load • Mount encoder directly to backing beams • Harmonic drive coupling on vertical screws for taper adjustment • Modified gear ratio for horizontal drive

  7. EPU90

  8. EPU90

  9. EPU90

  10. EPU90

  11. Vertical Drive • Drive Screws: • Max. load per screw = 17 kN • Static load rating = 107 kN (static), • Mean load ~ 10 kN • Dynamic load rating = 27 kN (dynamic) • Linear Roller Bearings • Moment load = 2.7 kN-m • Rating = 7.2 kN-m

  12. Vertical Drive • Torque/speed • Max torque = 1.2 N-m • Max speed = 1500 RPM • Motor rating (with EPU50 motor) • Cont. Stall Torque = 3.9 N-m • Rated speed = 1500 RPM

  13. Deformation due to Vertical Load

  14. Vertical Drive • Drive screw mounting is over constrained -affected by deflection of frame and bearing mounts. • EPU90 vs. EPU50 Scaling Comparison: • Vertical columns: • Vertical load: F90/F50 = 2.3 • Frame column stiffness: I90/I50 = 6.5 • Deflection: 90/ 50 = 0.35 • Duplex bearing mounts • Moment: M90/M50 = 1.9 • Stiffness: I90/I50 = 2.0 • Length: L90/L50 = 0.8 • Deflection: 90/ 50 = 0.67

  15. Backing Beam Deflection

  16. Backing Beam / Horizontal Drive Deflection Test Setup

  17. Backing Beam / Horizontal Drive • Cross Roller Bearings: • Load per roller = 1.0 kN • Bearing load rating = 3.9 kN • Torque/Speed with 5/1 gear ratio (3/1 on EPU50): • Max. torque = 2.1 N-m • Motor rating (using same motor as EPU50): • Cont. Stall Torque = 3.9 N-m • Speed limit = 900 RPM  vmax = 10 mm/sec (~10 secs. to switch polarization)

  18. Procurement/Fabrication Plan • Proceed with procurement of drive screws (long lead – critical path on schedule) • Initiate fabrication of backing beams, frame, etc. • Proceed with control system procurement after control system discussion/review

More Related