10/04/2025

• bidirectional control on each axis (H ridge)
  • Work within constraints of power supply

  • loops

  • Wires each accommodate X
• Mostly just pumping current through wire. Use ‘inverse kinematics’ -> next is software
• How did you decide dimensions?
  • System level req: volume of even field we want in middle (up to 5u, factoring in margins - do for each axis)
    • Get side length from this
    • Magnitude decided by # loops
    • Constraints: size of satellites & physical space of placing cage
• Have a requirements doc alr? - Ben
• To look into: settling time for cage
• How did you test the satellite?
• Did you load in a set of test scenarios then let it run, or?
  • Mainly for magnetometer & residual dipole measurements - open loop. Nullify field in the middle (is 0) so that anything you measure is from the satellite itself.
  • For bias: profile where cage outputs a sphere over time (starts at south pole, starts spiralling around to north pole) - Least Squares optimization problem. Take B around the satellite, comapre to output
  • Both open loop
  • For simulations: trickier. Didn’t get to that point. Concept; have orbit defined in Simulink, estimate what the field should be that the satellite measures based on orientation -> output of the cage. Timing wise is tricky. If not able to keep up with updated values, may saturate control system. Setting value in H ridge or outut of PSU ……output appearing in coils doesn’t matter (super short time). Quick dynamic system. Biggest concern is making controller fast enough
• Where are we planning to place the cage once built?
  • For operations: likely a cleanroom that we either borrow or rent out.
  • For storage: Likely the garage in the Myhal arena.
• Coils?
  • Square w rounded corner
  • Winding wire around it and keeping it tight is tricky
  • Too big w/out rigidity -> flex on coil
• Upper bound is 5u ****? - Ben B
  • Add length to 1 dimension, rest doesn’t matter. Still manageable - Alex
• Sat oct. 11 HAVE PAGES READY !!
• Systems Requirements Document
  • Verification method (test plan) W/each requirement
  • Close out each requirement
  • Draft of requirement of project
• Neera: testing procedures
• Karen: Mechanical specs