{
  "assumptions" : "Source: Søren Bøgh Andersen, DTU, 2012, Design and Optimization of Gearless Drives using Multi-Physics Approach, https:\/\/orbit.dtu.dk\/en\/publications\/design-and-optimization-of-gearless-drives-using-multi-physics-ap\/. Section 3.2\/Table 3.1: 60 poles, 504 slots, three phases, double-layer winding, 10-slot coil span, 84-slot base repeated six times; the published winding table is entered manually with native A\/B\/C mapped to printed U\/W\/V for the solver's positive phase sequence. Fig. 5.4\/Table 5.1: stator bore radius 5.400 m, outer radius 5.750 m, slot-pack outer radius 5.585 m, rotor pole tip 5.384 m (16 mm gap), base 4.955 m, root 5.135 m, shoe transition 5.328 m, half-widths W4=0.2605 m and W5=0.1620 m. Table 3.4: 1250 mm active stator length. Section 2.2: 490 A DC field, coil groups of 18+18+17 turns with three parallel copper rows (53 turns, consistent with 7950 m total active copper length \/ (60 poles × 2 × 1.25 m)). Educational approximations: uniform annular rotor core, constant-angle neck and shoe instead of the tapered\/curved individual pole profile, rectangular open slots without wedges\/cooling holes, uniform 1250 mm active stack, one stator turn and one parallel path, isolated 100 mm central steel placeholder (the mill has no motor shaft), and the same illustrative FEMM M-45 curve in both steels. Default stator current is zero for a field-only static study. The published 2480 A RMS stator excitation can be entered, but the maximum-torque phase must be found for this winding convention. Supplied circuit defaults are unused by the static solver. Table 3.3's 259.9 kN\/pole and 13.6 MNm apply at maximum torque; Table 3.2's -8518.47 kN\/m per pole is a separate published benchmark, not this model's calculated stiffness. No independent reproduction, operating performance, cooling, mill structure, startup or safety validation is claimed.",
  "checks" : [
    {
      "case" : "centered",
      "contour_force_x_N" : -5.8297700888942927e-08,
      "contour_force_y_N" : 8.5379895153891994e-08,
      "eccentricity_x_mm" : 0,
      "elapsed_seconds" : 42.286662936210632,
      "elements" : 934560,
      "field_current_A" : 490,
      "force_x_N" : -5.3936560107104015e-08,
      "force_y_N" : 4.6394270758476353e-08,
      "minimum_gap_mm" : 16,
      "nodes" : 469921,
      "nonlinear_iterations" : 16,
      "peak_B_T" : 2.959173942848365,
      "residual" : 3.06124111442963e-12,
      "stator_current_RMS_A" : 0,
      "torque_Nm" : 2.6179674250670359e-07
    },
    {
      "case" : "eccentric-6mm",
      "contour_force_x_N" : 1657672.7212606799,
      "contour_force_y_N" : 6.611574043802193e-08,
      "eccentricity_x_mm" : 6,
      "elapsed_seconds" : 46.224918961524963,
      "elements" : 934560,
      "field_current_A" : 490,
      "force_x_N" : 1604686.791444863,
      "force_y_N" : 4.1622314761458057e-08,
      "minimum_gap_mm" : 10,
      "nodes" : 469921,
      "nonlinear_iterations" : 17,
      "peak_B_T" : 2.9693999628690819,
      "residual" : 1.8289821387865874e-11,
      "stator_current_RMS_A" : 0,
      "torque_Nm" : 1.7107508654135017e-07
    },
    {
      "case" : "unexcited-6mm",
      "contour_force_x_N" : 0,
      "contour_force_y_N" : 0,
      "eccentricity_x_mm" : 6,
      "elapsed_seconds" : 0.7964709997177124,
      "elements" : 934560,
      "field_current_A" : 0,
      "force_x_N" : 0,
      "force_y_N" : 0,
      "minimum_gap_mm" : 10,
      "nodes" : 469921,
      "nonlinear_iterations" : 0,
      "peak_B_T" : 0,
      "residual" : 0,
      "stator_current_RMS_A" : 0,
      "torque_Nm" : 0
    }
  ],
  "comparison_scope" : "Native results use zero stator current and approximate geometry\/materials. Published maximum-torque references are comparison targets for a future matched reconstruction; they are not these native calculations.",
  "independent_thesis_reproduction" : false,
  "maximum_torque_operating_point_matched" : false,
  "mesh" : "draft",
  "model" : "Andersen 2012 • gearless mill-drive motor",
  "published_maximum_torque_references" : {
    "lateral_sensitivity_kN_per_mm" : 255.55410000000001,
    "mean_radial_force_per_pole_N" : 259900,
    "torque_Nm" : 13600000
  }
}