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-rw-r--r--coil_parasitics.py149
-rw-r--r--coil_parasitics_materials.yml76
-rw-r--r--coil_parasitics_sim.yml50
-rw-r--r--coil_parasitics_solvers.yml203
-rw-r--r--twisted_coil_gen_twolayer.py158
5 files changed, 632 insertions, 4 deletions
diff --git a/coil_parasitics.py b/coil_parasitics.py
new file mode 100644
index 0000000..b57e1f2
--- /dev/null
+++ b/coil_parasitics.py
@@ -0,0 +1,149 @@
+#!/usr/bin/env python3
+
+from pathlib import Path
+import multiprocessing
+import re
+import tempfile
+import subprocess
+import fnmatch
+import shutil
+import numpy as np
+
+from pyelmer import elmer
+import click
+from scipy import constants
+
+def enumerate_mesh_bodies(msh_file):
+ with open(msh_file, 'r') as f:
+ for line in f:
+ if line.startswith('$PhysicalNames'):
+ break
+ else:
+ raise ValueError('No physcial bodies found in mesh file.')
+
+ _num_names = next(f)
+
+ for line in f:
+ if line.startswith('$EndPhysicalNames'):
+ break
+
+ dim, _, line = line.strip().partition(' ')
+ tag, _, name = line.partition(' ')
+ yield name.strip().strip('"'), (int(dim), int(tag))
+
+INPUT_EXT_MAP = {
+ '.grd': 1,
+ '.mesh*': 2,
+ '.ep': 3,
+ '.ansys': 4,
+ '.inp': 5,
+ '.fil': 6,
+ '.FDNEUT': 7,
+ '.unv': 8,
+ '.mphtxt': 9,
+ '.dat': 10,
+ '.node': 11,
+ '.ele': 11,
+ '.mesh': 12,
+ '.msh': 14,
+ '.ep.i': 15,
+ '.2dm': 16}
+
+OUTPUT_EXT_MAP = {
+ '.grd': 1,
+ '.mesh*': 2,
+ '.ep': 3,
+ '.msh': 4,
+ '.vtu': 5}
+
+def elmer_grid(infile, outfile=None, intype=None, outtype=None, cwd=None, **kwargs):
+ infile = Path(infile)
+ if outfile is not None:
+ outfile = Path(outfile)
+
+ if intype is None:
+ intype = str(INPUT_EXT_MAP[infile.suffix])
+
+ if outtype is None:
+ if outfile is not None and outfile.suffix:
+ outtype = str(OUTPUT_EXT_MAP[outfile.suffix])
+ else:
+ outtype = '2'
+
+ if outfile is not None:
+ kwargs['out'] = str(outfile)
+
+ args = ['ElmerGrid', intype, outtype, infile]
+ for key, value in kwargs.items():
+ args.append(f'-{key}')
+ if isinstance(value, (tuple, list)):
+ args.extend(str(v) for v in value)
+ else:
+ args.append(str(value))
+ subprocess.run(args, cwd=cwd)
+
+def elmer_solver(cwd):
+ subprocess.run(['ElmerSolver'], cwd=cwd)
+
+
+@click.command()
+@click.option('-d', '--sim-dir', type=click.Path(dir_okay=True, file_okay=False, path_type=Path))
+@click.argument('mesh_file', type=click.Path(dir_okay=False, path_type=Path))
+def run_simulation(mesh_file, sim_dir):
+ physical = dict(enumerate_mesh_bodies(mesh_file))
+ if sim_dir is not None:
+ sim_dir = Path(sim_dir)
+ sim_dir.mkdir(exist_ok=True)
+
+ sim = elmer.load_simulation('3D_steady', 'coil_parasitics_sim.yml')
+ mesh_dir = '.'
+ mesh_fn = 'mesh'
+ sim.header['Mesh DB'] = f'"{mesh_dir}" "{mesh_fn}"'
+ sim.constants.update({
+ 'Permittivity of Vacuum': str(constants.epsilon_0),
+ 'Gravity(4)': f'0 -1 0 {constants.g}',
+ 'Boltzmann Constant': str(constants.Boltzmann),
+ 'Unit Charge': str(constants.elementary_charge)})
+
+ air = elmer.load_material('air', sim, 'coil_parasitics_materials.yml')
+ ro4003c = elmer.load_material('ro4003c', sim, 'coil_parasitics_materials.yml')
+
+ solver_electrostatic = elmer.load_solver('Electrostatics_Capacitance', sim, 'coil_parasitics_solvers.yml')
+ solver_electrostatic.data['Potential Difference'] = '1.0'
+ eqn = elmer.Equation(sim, 'main', [solver_electrostatic])
+
+ bdy_sub = elmer.Body(sim, 'substrate', [physical['substrate'][1]])
+ bdy_sub.material = ro4003c
+ bdy_sub.equation = eqn
+
+ bdy_ab = elmer.Body(sim, 'airbox', [physical['airbox'][1]])
+ bdy_ab.material = air
+ bdy_ab.equation = eqn
+
+ # boundaries
+ for name, identity in physical.items():
+ if (m := re.fullmatch(r'trace([0-9]+)', name)):
+ num = int(m.group(1))
+
+ bndry_m2 = elmer.Boundary(sim, name, [identity[1]])
+ bndry_m2.data['Capacitance Body'] = str(num)
+
+ boundary_airbox = elmer.Boundary(sim, 'FarField', [physical['airbox_surface'][1]])
+ boundary_airbox.data['Electric Infinity BC'] = 'True'
+
+ with tempfile.TemporaryDirectory() as tmpdir:
+ if sim_dir:
+ tmpdir = str(sim_dir)
+
+ sim.write_startinfo(tmpdir)
+ sim.write_sif(tmpdir)
+ # Convert mesh from gmsh to elemer formats. Also scale it from 1 unit = 1 mm to 1 unit = 1 m (SI units)
+ elmer_grid(mesh_file.name, 'mesh', cwd=tmpdir, scale=[1e-3, 1e-3, 1e-3])
+ elmer_solver(tmpdir)
+
+ capacitance_matrix = np.loadtxt(tmpdir / 'capacitance.txt')
+
+
+
+if __name__ == '__main__':
+ run_simulation()
diff --git a/coil_parasitics_materials.yml b/coil_parasitics_materials.yml
new file mode 100644
index 0000000..ecb49b7
--- /dev/null
+++ b/coil_parasitics_materials.yml
@@ -0,0 +1,76 @@
+air:
+ Density: 1.1885 # 20°C
+ Electric Conductivity: 0.0
+ Heat Capacity: 1006.4 # 20°C
+ Heat Conductivity: 0.025873 # 20°C
+ Relative Permeability: 1
+ Relative Permittivity: 1
+ro4003c:
+ Density: 1790 # 23°C
+ Relative Permeability: 1
+ Relative Permittivity: 3.55
+ideal:
+ Relative Permittivity: 1
+copper_inductor:
+ Density: 8960.0 # 20°C
+ Electric Conductivity: 0.0 # necessary for 2D
+ Emissivity: 0.012 # 327°C
+ Heat Capacity: 384.4 # interpolated for 20°C
+ Heat Conductivity: 401.0
+ Relative Permeability: 1
+ Relative Permittivity: 1
+copper:
+ Density: 8960.0 # 0°C
+ Electric Conductivity: 32300000 # 200°C
+ Emissivity: 0.012 # 327°C
+ Heat Capacity: 415.0 # 200°C
+ Heat Conductivity: 401.0 # 0°C
+ Relative Permeability: 1
+ Relative Permittivity: 1
+graphite_CZ3-R6300: # crucible
+ Density: 1730.0
+ Electric Conductivity: 58800
+ Emissivity: 0.81 # 205°C
+ Heat Capacity: 1237.0
+ Heat Conductivity: 65 # 20°C
+ Relative Permeability: 1
+ Relative Permittivity: 1
+graphite_FU8957: # heater
+ Density: 1750.0
+ Emissivity: 0.81 # 250°C
+ Heat Capacity: 1237.0
+ Heat Conductivity: 105 # averaged over different given values
+ Relative Permeability: 1
+ Relative Permittivity: 1
+steel_1.4541:
+ Density: 7900.0 # 20°C
+ Electric Conductivity: 1370
+ Emissivity: 0.111 # 200°C
+ Heat Capacity: 470.0 # 20°C
+ Heat Conductivity: 15.0 # 20°C
+ Relative Permeability: 1
+ Relative Permittivity: 1
+tin_liquid:
+ Density: 6980.0
+ Electric Conductivity: 2080000
+ Emissivity: 0.064 # set equal to solid
+ Heat Capacity: 252.7
+ Heat Conductivity: 29.0
+ Relative Permeability: 1
+ Relative Permittivity: 1
+ Liquid: 'Logical True'
+tin_solid:
+ Density: 7179.0
+ Electric Conductivity: 4380000
+ Emissivity: 0.064
+ Heat Capacity: 244.0
+ Heat Conductivity: 60.0
+ Relative Permeability: 1
+ Relative Permittivity: 1
+ Solid: 'Logical True'
+ Melting Point: 505
+ Latent Heat: 59600
+water:
+ Density: 1000.0
+ Heat Capacity: 4182.0
+ Heat Conductivity: 0.6
diff --git a/coil_parasitics_sim.yml b/coil_parasitics_sim.yml
new file mode 100644
index 0000000..f65dd35
--- /dev/null
+++ b/coil_parasitics_sim.yml
@@ -0,0 +1,50 @@
+2D_steady:
+ Max Output Level: 4
+ Coordinate System: Cartesian 2D
+ Simulation Type: Steady state
+ Steady State Max Iterations: 10
+
+3D_steady:
+ Max Output Level: 5
+ Coordinate System: Cartesian
+ Coordinate Mapping(3): 1 2 3
+ Simulation Type: Steady state
+ Steady State Max Iterations: 1
+ Output Intervals: 1
+ Timestepping Method: BDF
+ BDF Order: 1
+ Solver Input File: case.sif
+ Post File: case.vtu
+ Output File: case.result
+
+2D_transient:
+ Max Output Level: 4
+ Coordinate System: Cartesian 2D
+ Simulation Type: Transient
+ Steady State Max Iterations: 10
+ Output File: case.result
+ Output Intervals: 10
+ Timestep Sizes: 0.1
+ Timestep Intervals: 100
+ Timestepping Method: BDF
+ BDF Order: 1
+
+
+axi-symmetric_steady:
+ Max Output Level: 4
+ Coordinate System: Axi Symmetric
+ Simulation Type: Steady state
+ Steady State Max Iterations: 10
+ Output File: case.result
+
+axi-symmetric_transient:
+ Max Output Level: 4
+ Coordinate System: Axi Symmetric
+ Simulation Type: Transient
+ Steady State Max Iterations: 10
+ Output File: case.result
+ Output Intervals: 10
+ Timestep Sizes: 0.1
+ Timestep Intervals: 100
+ Timestepping Method: BDF
+ BDF Order: 1
diff --git a/coil_parasitics_solvers.yml b/coil_parasitics_solvers.yml
new file mode 100644
index 0000000..93a935c
--- /dev/null
+++ b/coil_parasitics_solvers.yml
@@ -0,0 +1,203 @@
+Electrostatics_Capacitance:
+ Equation: Electrostatics
+ Calculate Electric Field: True
+ Calculate Capacitance Matrix: True
+ Capacitance Matrix Filename: capacitance.txt
+ Procedure: '"StatElecSolve" "StatElecSolver"'
+ Variable: Potential
+ Calculate Electric Energy: True
+ Exec Solver: Always
+ Stabilize: True
+ Bubbles: False
+ Lumped Mass Matrix: False
+ Optimize Bandwidth: True
+ Steady State Convergence Tolerance: 1.0e-5
+ Nonlinear System Convergence Tolerance: 1.0e-7
+ Nonlinear System Max Iterations: 20
+ Nonlinear System Newton After Iterations: 3
+ Nonlinear System Newton After Tolerance: 1.0e-3
+ Nonlinear System Relaxation Factor: 1
+ Linear System Solver: Iterative
+ Linear System Iterative Method: BiCGStab
+ Linear System Max Iterations: 500
+ Linear System Convergence Tolerance: 1.0e-10
+ BiCGstabl polynomial degree: 2
+ Linear System Preconditioning: ILU0
+ Linear System ILUT Tolerance: 1.0e-3
+ Linear System Abort Not Converged: False
+ Linear System Residual Output: 10
+ Linear System Precondition Recompute: 1
+Electrostatics:
+ Equation: Electrostatics
+ Calculate Electric Field: True
+ Procedure: '"StatElecSolve" "StatElecSolver"'
+ Variable: Potential
+ Calculate Electric Energy: True
+ Exec Solver: Always
+ Stabilize: True
+ Bubbles: False
+ Lumped Mass Matrix: False
+ Optimize Bandwidth: True
+ Steady State Convergence Tolerance: 1.0e-5
+ Nonlinear System Convergence Tolerance: 1.0e-7
+ Nonlinear System Max Iterations: 20
+ Nonlinear System Newton After Iterations: 3
+ Nonlinear System Newton After Tolerance: 1.0e-3
+ Nonlinear System Relaxation Factor: 1
+ Linear System Solver: Iterative
+ Linear System Iterative Method: BiCGStab
+ Linear System Max Iterations: 500
+ Linear System Convergence Tolerance: 1.0e-10
+ BiCGstabl polynomial degree: 2
+ Linear System Preconditioning: ILU0
+ Linear System ILUT Tolerance: 1.0e-3
+ Linear System Abort Not Converged: False
+ Linear System Residual Output: 10
+ Linear System Precondition Recompute: 1
+ThermoElectricSolver:
+ Equation: ThermoElectric
+ Procedure: '"ThermoElectricSolver" "ThermoElectricSolver"'
+ Variable: POT[Temperature:1 Potential:1]
+ Element: '"p:1"'
+ Calculate Loads: True
+ Exec Solver: Always
+ Nonlinear System Convergence Tolerance: 1.0e-6
+ Nonlinear System Max Iterations: 100
+ Nonlinear System Newton After Iterations : 1
+ Nonlinear System Newton After Tolerance: 1e-9
+ Linear System Solver: '"Iterative"'
+ Linear System Iterative Method: BicgstabL
+ Bicgstabl Polynomial Degree: 2
+ Linear System Max Iterations: 200
+ Linear System Residual Output: 40
+ Linear System Preconditioning: Ilu
+ Linear System Convergence Tolerance: 1e-8
+ Steady State Convergence Tolerance: 1e-6
+HeatSolver:
+ Equation: HeatSolver
+ Procedure: '"HeatSolve" "HeatSolver"'
+ Variable: '"Temperature"'
+ Variable Dofs: 1
+ Calculate Loads: True
+ Exec Solver: Always
+ Nonlinear System Convergence Tolerance: 1.0e-6
+ Nonlinear System Max Iterations: 1000
+ Nonlinear System Relaxation Factor: 0.7
+ Steady State Convergence Tolerance: 1.0e-6
+ Stabilize: True # Necessary in convection-dominated systems
+ Optimize Bandwidth: True
+ Linear System Solver: Iterative
+ Linear System Iterative Method: BiCGStab
+ Linear System Max Iterations: 1000
+ Linear System Preconditioning: ILU
+ Linear System Precondition Recompute: 1
+ Linear System Convergence Tolerance: 1.0e-8
+ Linear System Abort Not Converged: True
+ Linear System Residual Output: 1
+ Smart Heater Control After Tolerance: 1.0e-4
+MagnetoDynamics2DHarmonic:
+ Equation: MagnetoDynamics2DHarmonic
+ Procedure: '"MagnetoDynamics2D" "MagnetoDynamics2DHarmonic"'
+ Variable: 'Potential[Potential Re:1 Potential Im:1]'
+ Variable Dofs: 2
+ Exec Solver: Always
+ Nonlinear System Convergence Tolerance: 1.0e-6
+ Nonlinear System Max Iterations: 1000
+ Nonlinear System Relaxation Factor: 0.7
+ Steady State Convergence Tolerance: 1.0e-6
+ Optimize Bandwidth: True
+ Linear System Solver: Iterative
+ Linear System Iterative Method: BiCGStab
+ Linear System Max Iterations: 1000
+ Linear System Preconditioning: ILU
+ Linear System Precondition Recompute: 1
+ Linear System Convergence Tolerance: 1.0e-8
+ Linear System Abort Not Converged: True
+ Linear System Residual Output: 1
+MagnetoDynamicsCalcFields:
+ Equation: MagnetoDynamicsCalcFields
+ Procedure: '"MagnetoDynamics" "MagnetoDynamicsCalcFields"'
+ Potential Variable: Potential
+ Angular Frequency: 8.48e4
+ Calculate Joule Heating: True
+ Calculate Magnetic Field Strength: True
+ Calculate Electric Field: True
+ Exec Solver: Always
+ Calculate Nodal Fields: Logical False
+ Calculate Elemental Fields: Logical True
+StatMagSolver:
+ Equation: StatMagSolver
+ Procedure: '"StatMagSolve" "StatMagSolver"'
+ Variable: Potential
+ Variable DOFs: 2
+ Calculate Joule Heating: 'Logical True'
+ Calculate Magnetic Flux: 'Logical True'
+ Exec Solver: Always
+ Nonlinear System Convergence Tolerance: 1.0e-6
+ Nonlinear System Max Iterations: 1000
+ Nonlinear System Relaxation Factor: 0.7
+ Steady State Convergence Tolerance: 1.0e-6
+ Optimize Bandwidth: True
+ Linear System Solver: Iterative
+ Linear System Iterative Method: BiCGStab
+ Linear System Max Iterations: 1000
+ Linear System Preconditioning: ILU
+ Linear System Precondition Recompute: 1
+ Linear System Convergence Tolerance: 1.0e-8
+ Linear System Abort Not Converged: True
+ Linear System Residual Output: 1
+SaveMaterials:
+ Exec Solver: 'After timestep'
+ Procedure: 'File "SaveData" "SaveMaterials"'
+ Parameter 1: 'String "Heat Conductivity"'
+ResultOutputSolver:
+ Exec Solver: 'After timestep'
+ Equation: ResultOutputSolver
+ Procedure: '"ResultOutputSolve" "ResultOutputSolver"'
+ VTU Format: True
+ Save Geometry Ids: 'Logical True'
+FluxSolver:
+ Exec Solver: 'After timestep'
+ Equation: 'Flux Solver'
+ Procedure: '"FluxSolver" "FluxSolver"'
+ Calculate Grad: 'Logical True'
+ Calculate Flux: 'Logical True'
+ Target Variable: 'String "Temperature"'
+ Flux Coefficient: 'String "Heat Conductivity"'
+ Exec Solver: Always
+ Nonlinear System Convergence Tolerance: 1.0e-6
+ Nonlinear System Max Iterations: 1000
+ Nonlinear System Relaxation Factor: 0.7
+ Steady State Convergence Tolerance: 1.0e-6
+ Optimize Bandwidth: True
+ Linear System Solver: Iterative
+ Linear System Iterative Method: BiCGStab
+ Linear System Max Iterations: 1000
+ Linear System Preconditioning: ILU
+ Linear System Precondition Recompute: 1
+ Linear System Convergence Tolerance: 1.0e-8
+ Linear System Abort Not Converged: True
+ Linear System Residual Output: 1
+SaveScalars:
+ Exec Solver: 'After timestep'
+ Equation: SaveScalars
+ Procedure: '"SaveData" "SaveScalars"'
+ Filename: '"boundary_scalars.dat"'
+ Output Directory: './results'
+ Operator 1: 'boundary sum'
+ Variable 1: 'Temperature Loads'
+ Operator 2: 'diffusive flux'
+ Variable 2: Temperature
+ Coefficient 2: 'Heat Conductivity'
+SaveLine:
+ Exec Solver: 'After timestep'
+ Equation: '"SaveLine"'
+ Procedure: '"SaveData" "SaveLine"'
+ Filename: '"boundary_lines.dat"'
+ Output Directory: './results'
+ Variable 1: Temperature Loads
+SteadyPhaseChange:
+ Equation: SteadyPhaseChange
+ Variable: '"Phase Surface"'
+ Procedure: '"SteadyPhaseChange" "SteadyPhaseChange"'
+ Internal Mesh Movement: 'Logical True'
diff --git a/twisted_coil_gen_twolayer.py b/twisted_coil_gen_twolayer.py
index 77fea7a..475fe16 100644
--- a/twisted_coil_gen_twolayer.py
+++ b/twisted_coil_gen_twolayer.py
@@ -7,7 +7,10 @@ import os
from math import *
from pathlib import Path
from itertools import cycle
+
from scipy.constants import mu_0
+import numpy as np
+import click
import matplotlib as mpl
from gerbonara.cad.kicad import pcb as kicad_pcb
@@ -16,7 +19,7 @@ from gerbonara.cad.kicad import graphical_primitives as kicad_gr
from gerbonara.cad.kicad import primitives as kicad_pr
from gerbonara.utils import Tag
from gerbonara import graphic_primitives as gp
-import click
+from gerbonara import graphic_objects as go
__version__ = '1.0.0'
@@ -64,7 +67,7 @@ def traces_to_gmsh(traces, mesh_out, bbox, model_name='gerbonara_board', log=Tru
trace_tags = {}
trace_ends = set()
render_cache = {}
- for i, tr in enumerate(traces):
+ for i, tr in enumerate(traces, start=1):
layer = tr[1].layer
z0 = 0 if layer == 'F.Cu' else -(board_thickness+copper_thickness)
@@ -141,6 +144,141 @@ def traces_to_gmsh(traces, mesh_out, bbox, model_name='gerbonara_board', log=Tru
gmsh.write(str(mesh_out))
+def traces_to_gmsh_mag(traces, mesh_out, bbox, model_name='gerbonara_board', log=True, copper_thickness=0.035, board_thickness=0.8, air_box_margin=5.0):
+ import gmsh
+ occ = gmsh.model.occ
+ eps = 1e-6
+
+ board_thickness -= 2*copper_thickness
+
+ gmsh.initialize()
+ gmsh.model.add('gerbonara_board')
+ if log:
+ gmsh.logger.start()
+
+ trace_tags = []
+ trace_ends = set()
+ render_cache = {}
+ for i, tr in enumerate(traces, start=1):
+ layer = tr[1].layer
+ z0 = 0 if layer == 'F.Cu' else -(board_thickness+copper_thickness)
+
+ objs = [obj
+ for elem in tr
+ for obj in elem.render(cache=render_cache)]
+
+ tags = []
+ for ob in objs:
+ if isinstance(ob, go.Line):
+ length = dist((ob.x1, ob.y1), (ob.x2, ob.y2))
+ w = ob.aperture.equivalent_width('mm')
+ box_tag = occ.addBox(0, -w/2, 0, length, w, copper_thickness)
+ angle = atan2(ob.y2 - ob.y1, ob.x2 - ob.x1)
+ occ.rotate([(3, box_tag)], 0, 0, 0, 0, 0, 1, angle)
+ occ.translate([(3, box_tag)], ob.x1, ob.y1, z0)
+ tags.append(box_tag)
+
+ for x, y in ((ob.x1, ob.y1), (ob.x2, ob.y2)):
+ disc_id = (round(x, 3), round(y, 3), round(z0, 3), round(w, 3))
+ if disc_id in trace_ends:
+ continue
+
+ trace_ends.add(disc_id)
+ cylinder_tag = occ.addCylinder(x, y, z0, 0, 0, copper_thickness, w/2)
+ tags.append(cylinder_tag)
+
+ for elem in tr:
+ if isinstance(elem, kicad_pcb.Via):
+ cylinder_tag = occ.addCylinder(elem.at.x, elem.at.y, 0, 0, 0, -board_thickness, elem.drill)
+ tags.append(cylinder_tag)
+
+ print('fusing', tags)
+ tags, tag_map = occ.fuse([(3, tags[0])], [(3, tag) for tag in tags[1:]])
+ print(tags)
+ assert len(tags) == 1
+ (_dim, tag), = tags
+ trace_tags.append(tag)
+
+ print('fusing top-level', trace_tags)
+ tags, tag_map = occ.fuse([(3, trace_tags[0])], [(3, tag) for tag in trace_tags[1:]])
+ print(tags)
+ assert len(tags) == 1
+ (_dim, toplevel_tag), = tags
+
+ first_geom = traces[0][0]
+ interface_tag_top = occ.addDisk(first_geom.start.x, first_geom.start.y, 0, first_geom.width, first_geom.width)
+ interface_tag_bottom = occ.addDisk(first_geom.end.x, first_geom.end.y, -board_thickness, first_geom.width, first_geom.width)
+
+ (x1, y1), (x2, y2) = bbox
+ substrate = occ.addBox(x1, y1, -board_thickness, x2-x1, y2-y1, board_thickness)
+
+ x1, y1 = x1-air_box_margin, y1-air_box_margin
+ x2, y2 = x2+air_box_margin, y2+air_box_margin
+ w, d = x2-x1, y2-y1
+ z0 = -board_thickness-air_box_margin
+ ab_h = board_thickness + 2*air_box_margin
+ airbox = occ.addBox(x1, y1, z0, w, d, ab_h)
+
+ print('Cutting airbox')
+ occ.cut([(3, airbox)], [(3, toplevel_tag)], removeObject=True, removeTool=False)
+
+ print('Cutting substrate')
+ occ.cut([(3, substrate)], [(3, toplevel_tag)], removeObject=True, removeTool=False)
+
+ print('Synchronizing')
+ occ.synchronize()
+
+ substrate_physical = gmsh.model.add_physical_group(3, [substrate], name='substrate')
+ airbox_physical = gmsh.model.add_physical_group(3, [airbox], name='airbox')
+ trace_physical_surfaces = [
+ gmsh.model.add_physical_group(2, list(gmsh.model.getAdjacencies(3, tag)[1]), name=f'trace{i}')
+ for i, tag in trace_tags.items()]
+
+ airbox_adjacent = set(gmsh.model.getAdjacencies(3, airbox)[1])
+ in_bbox = {tag for _dim, tag in gmsh.model.getEntitiesInBoundingBox(x1+eps, y1+eps, z0+eps, x1+w-eps, y1+d-eps, z0+ab_h-eps, dim=3)}
+ airbox_physical_surface = gmsh.model.add_physical_group(2, list(airbox_adjacent - in_bbox), name='airbox_surface')
+
+ points_airbox_adjacent = set(gmsh.model.getAdjacencies(0, airbox)[1])
+ points_inside = {tag for _dim, tag in gmsh.model.getEntitiesInBoundingBox(x1+eps, y1+eps, z0+eps, x1+w-eps, y1+d-eps, z0+ab_h-eps, dim=0)}
+ gmsh.model.mesh.setSize([(0, tag) for tag in points_airbox_adjacent - points_inside], 10e-3)
+
+ gmsh.option.setNumber('Mesh.MeshSizeFromCurvature', 90)
+ gmsh.option.setNumber('Mesh.Smoothing', 10)
+ gmsh.option.setNumber('Mesh.Algorithm3D', 10)
+ gmsh.option.setNumber('Mesh.MeshSizeMax', 1)
+ gmsh.option.setNumber('General.NumThreads', multiprocessing.cpu_count())
+
+ print('Meshing')
+ gmsh.model.mesh.generate(dim=3)
+ print('Writing')
+ gmsh.write(str(mesh_out))
+
+
+def traces_to_magneticalc(traces, out, pcb_thickness=0.8):
+ coords = []
+ last_x, last_y, last_z = None, None, None
+ def coord(x, y, z):
+ nonlocal coords, last_x, last_y, last_z
+ if (x, y, z) != (last_x, last_y, last_z):
+ coords.append((x, y, z))
+
+ render_cache = {}
+ for tr in traces:
+ z = pcb_thickness if tr[1].layer == 'F.Cu' else 0
+ objs = [obj
+ for elem in tr
+ for obj in elem.render(cache=render_cache)
+ if isinstance(elem, (kicad_pcb.TrackSegment, kicad_pcb.TrackArc))]
+
+ # start / switch layer
+ coord(objs[0].x1, objs[0].y1, z)
+
+ for ob in objs:
+ coord(ob.x2, ob.y2, z)
+
+ np.savetxt(out, np.array(coords) / 10) # magneticalc expects centimeters, not millimeters.
+
+
class SVGPath:
def __init__(self, **attrs):
self.d = ''
@@ -235,16 +373,19 @@ def print_valid_twists(ctx, param, value):
@click.option('--keepout-zone/--no-keepout-zone', default=True, help='Add a keepout are to the footprint (default: yes)')
@click.option('--keepout-margin', type=float, default=5, help='Margin between outside of coil and keepout area (mm, default: 5)')
@click.option('--twists', type=int, default=1, help='Number of twists per revolution. Note that this number must be co-prime to the number of turns. Run with --show-twists to list valid values. (default: 1)')
+@click.option('--circle-segments', type=int, default=64, help='When not using arcs, the number of points to use for arc interpolation per 360 degrees.')
@click.option('--show-twists', callback=print_valid_twists, expose_value=False, type=int, is_eager=True, help='Calculate and show valid --twists counts for the given number of turns. Takes the number of turns as a value.')
@click.option('--clearance', type=float, default=None)
@click.option('--arc-tolerance', type=float, default=0.02)
@click.option('--mesh-out', type=click.Path(writable=True, dir_okay=False, path_type=Path))
+@click.option('--mag-mesh-out', type=click.Path(writable=True, dir_okay=False, path_type=Path))
+@click.option('--magneticalc-out', type=click.Path(writable=True, dir_okay=False, path_type=Path))
@click.option('--clipboard/--no-clipboard', help='Use clipboard integration (requires wl-clipboard)')
@click.option('--counter-clockwise/--clockwise', help='Direction of generated spiral. Default: clockwise when wound from the inside.')
@click.version_option()
def generate(outfile, turns, outer_diameter, inner_diameter, via_diameter, via_drill, via_offset, trace_width, clearance,
footprint_name, layer_pair, twists, clipboard, counter_clockwise, keepout_zone, keepout_margin,
- arc_tolerance, pcb, mesh_out):
+ arc_tolerance, pcb, mesh_out, magneticalc_out, circle_segments, mag_mesh_out):
if 'WAYLAND_DISPLAY' in os.environ:
copy, paste, cliputil = ['wl-copy'], ['wl-paste'], 'xclip'
else:
@@ -256,6 +397,9 @@ def generate(outfile, turns, outer_diameter, inner_diameter, via_diameter, via_d
if mesh_out and not pcb:
raise click.ClickException('--pcb is required when --mesh-out is used.')
+ if magneticalc_out and not pcb:
+ raise click.ClickException('--pcb is required when --magneticalc-out is used.')
+
outer_radius = outer_diameter/2
inner_radius = inner_diameter/2
turns_per_layer = turns/2
@@ -466,7 +610,7 @@ def generate(outfile, turns, outer_diameter, inner_diameter, via_diameter, via_d
end_angle = fold_angle + sweeping_angle
x = inverse[i]*floor(2*sweeping_angle / (2*pi)) * 2*pi
- (x0, y0), (xn, yn), clen = do_spiral(0, outer_radius, inner_radius, start_angle, fold_angle, (x + start_angle)/total_angle, (x + fold_angle)/total_angle)
+ (x0, y0), (xn, yn), clen = do_spiral(0, outer_radius, inner_radius, start_angle, fold_angle, (x + start_angle)/total_angle, (x + fold_angle)/total_angle, circle_segments)
do_spiral(1, inner_radius, outer_radius, fold_angle, end_angle, (x + fold_angle)/total_angle, (x + end_angle)/total_angle)
xv, yv = inner_via_ring_radius*cos(fold_angle), inner_via_ring_radius*sin(fold_angle)
@@ -578,6 +722,12 @@ def generate(outfile, turns, outer_diameter, inner_diameter, via_diameter, via_d
if mesh_out:
traces_to_gmsh(traces, mesh_out, ((-r, -r), (r, r)))
+ if mag_mesh_out:
+ traces_to_gmsh_mag(traces, mesh_out, ((-r, -r), (r, r)))
+
+ if magneticalc_out:
+ traces_to_magneticalc(traces, magneticalc_out)
+
# for trace in traces:
# print(f'Trace {i}', file=sys.stderr)
# print(f' Length: {len(trace)}', file=sys.stderr)