{
  "purpose": "Escondida thesis-based educational gearless drive example, not project acceptance",
  "sources": [
    {
      "id": "Andersen2012",
      "title": "Design and Optimization of Gearless Drives using Multi-Physics Approach",
      "author": "Soren Bogh Andersen",
      "year": 2012,
      "url": "https://backend.orbit.dtu.dk/ws/files/108702057/Design_and_Optimization_of_Gearless.pdf",
      "references": [
        "Printed p.24, Table 3.2: negative stiffness per pole",
        "Printed p.84, Table 6.8: 259.9 kN attraction per pole"
      ],
      "use": "Published saturated pole-response benchmark; separate approximate native geometry example is available in Andersen2012, with quantitative thesis agreement unverified.",
      "drive_type": "gearless mill drive"
    },
    {
      "id": "structural-reference",
      "revision": "Issue 2, May 2026",
      "references": [
        "p.36, Appendix D shaft stations",
        "p.14, Table 1 fatigue belt tensions"
      ],
      "use": "Shaft layout and fatigue belt resultant; mechanical stiffness/weights remain assumptions",
      "title": "Supplied structural reference (anonymized)"
    },
    {
      "id": "GalassoHofer2018",
      "url": "https://hdl.handle.net/11673/47441",
      "references": [
        "Printed pp.1-2: Escondida OGP1 overland conveyor context",
        "Table 3.1",
        "Appendix A",
        "Motor Maven GalassoHofer2018/source-data.json"
      ],
      "use": "16-pole, 144-slot, 8 mm gap electromagnetic template at fixed field current; assumed pole details and active length remain unresolved",
      "published_site": "Minera Escondida, Chile",
      "published_conveyors": [
        "CT-236",
        "CT-237",
        "CT-238"
      ]
    }
  ],
  "source_values": {
    "shaft_length_mm": 6197,
    "bearing_stations_mm": [
      1890,
      5090
    ],
    "locking_device_bands_mm": [
      [
        2440,
        2757
      ],
      [
        4223,
        4540
      ]
    ],
    "belt_tensions_fatigue_kN": [
      2198,
      1447
    ],
    "belt_resultant_fatigue_kN": 3645
  },
  "derived_values": {
    "bearing_span_mm": 3200,
    "hub_load_stations_mm": [
      2598.5,
      4381.5
    ],
    "andersen_lateral_stiffness_N_per_mm": 255554.1,
    "andersen_derivation": "60 uniformly spaced poles times one-half times 8518.47 N/mm per-pole attraction derivative"
  },
  "assumptions": {
    "uniform_shaft_diameter_mm": 860,
    "young_modulus_MPa": 210000,
    "steel_density_kg_per_m3": 7850,
    "magnetic_center_and_rigid_attachment_station_mm": 900,
    "active_stack_mm": 1400,
    "rotor_mass_kg": 20000,
    "pulley_mass_kg": 50000,
    "equal_hub_load_split": true,
    "each_bearing_translation_N_per_mm": 2000000,
    "stator_translation_N_per_mm": 1000000,
    "stator_rotation_N_mm_per_rad": 1000000000000.0,
    "initial_alignment_mm": [
      0,
      0
    ],
    "transverse_force_map": "Radial odd isotropic extension of whole-stack FEM x-pull",
    "axial_distribution": "Independent uniform axial slices; three-point Gauss integration",
    "pulley_body_moment_share_fraction": 0.4,
    "shaft_moment_share_fraction_between_hubs": 0.6,
    "moment_share_extent_mm": [
      2598.5,
      4381.5
    ],
    "moment_share_origin": "User-selected 40% sensitivity assumption, not published data or calculated pulley-body stiffness.",
    "moment_share_method": "Between hub centers, EI_total=EI_shaft/(1-f); body carries f of total bending moment, shaft 1-f. Full belt, gravity and magnetic loads are retained. Outside hubs the body carries zero bending moment."
  },
  "limitations": [
    "Andersen benchmark aggregates the published response approximation. The separate native geometry model uses documented pole-profile and steel substitutions; quantitative thesis agreement is not established.",
    "Galasso Hofer force magnitude disagreement remains unresolved.",
    "Shaft is an Euler-Bernoulli beam with an assumed constant 40% body moment share between hubs. Shell, end-disk and locking-device stiffness, shear and local ring distortion are not calculated explicitly.",
    "Thermal expansion, axial magnetic forces, shaft-axis torque, stress, fatigue, drive dynamics and modal frequencies are not calculated.",
    "Support stiffness, active stack, motor center and masses are illustrative; this combines different equipment records.",
    "Magnetic map interpolation has no extrapolation; both active ends must stay within its range."
  ],
  "pulley_body_stiffness_explicitly_calculated": false
}