diff options
Diffstat (limited to 'coil_parasitics.py')
| -rw-r--r-- | coil_parasitics.py | 85 |
1 files changed, 72 insertions, 13 deletions
diff --git a/coil_parasitics.py b/coil_parasitics.py index 47d5cd2..08a3603 100644 --- a/coil_parasitics.py +++ b/coil_parasitics.py @@ -1,15 +1,16 @@ #!/usr/bin/env python3 +import math 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 subprocess_tee import click from scipy import constants @@ -31,6 +32,17 @@ def enumerate_mesh_bodies(msh_file): tag, _, name = line.partition(' ') yield name.strip().strip('"'), (int(dim), int(tag)) +# https://en.wikipedia.org/wiki/Metric_prefix +SI_PREFIX = 'QRYZEPTGMk mµnpfazyrq' + +def format_si(value, unit='', fractional_digits=1): + mag = int(math.log10(abs(value))//3) + value /= 1000**mag + prefix = SI_PREFIX[SI_PREFIX.find(' ') - mag].strip() + value = f'{{:.{fractional_digits}f}}'.format(value) + return f'{value} {prefix}{unit}' + + INPUT_EXT_MAP = { '.grd': 1, '.mesh*': 2, @@ -56,7 +68,7 @@ OUTPUT_EXT_MAP = { '.msh': 4, '.vtu': 5} -def elmer_grid(infile, outfile=None, intype=None, outtype=None, cwd=None, **kwargs): +def elmer_grid(infile, outfile=None, intype=None, outtype=None, cwd=None, stdout_log=None, stderr_log=None, **kwargs): infile = Path(infile) if outfile is not None: outfile = Path(outfile) @@ -80,10 +92,20 @@ def elmer_grid(infile, outfile=None, intype=None, outtype=None, cwd=None, **kwar args.extend(str(v) for v in value) else: args.append(str(value)) - subprocess.run(args, cwd=cwd, check=True) -def elmer_solver(cwd): - subprocess.run(['ElmerSolver'], cwd=cwd) + result = subprocess_tee.run(args, cwd=cwd, check=True) + if stdout_log: + Path(stdout_log).write_text(result.stdout or '') + if stderr_log: + Path(stderr_log).write_text(result.stderr or '') + +def elmer_solver(cwd, stdout_log=None, stderr_log=None): + result = subprocess_tee.run(['ElmerSolver'], cwd=cwd, check=True) + if stdout_log: + Path(stdout_log).write_text(result.stdout or '') + if stderr_log: + Path(stderr_log).write_text(result.stderr or '') + return result @click.command() @@ -132,14 +154,17 @@ def run_capacitance_simulation(mesh_file, sim_dir): boundary_airbox.data['Electric Infinity BC'] = 'True' with tempfile.TemporaryDirectory() as tmpdir: - if sim_dir: - tmpdir = str(sim_dir) + tmpdir = sim_dir if sim_dir else Path(tmpdir) 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.absolute(), 'mesh', cwd=tmpdir, scale=[1e-3, 1e-3, 1e-3]) - elmer_solver(tmpdir) + elmer_grid(mesh_file.absolute(), 'mesh', cwd=tmpdir, scale=[1e-3, 1e-3, 1e-3], + stdout_log=(tmpdir / 'ElmerGrid_stdout.log'), + stderr_log=(tmpdir / 'ElmerGrid_stderr.log')) + elmer_solver(tmpdir, + stdout_log=(tmpdir / 'ElmerSolver_stdout.log'), + stderr_log=(tmpdir / 'ElmerSolver_stderr.log')) capacitance_matrix = np.loadtxt(tmpdir / 'capacitance.txt') @@ -194,6 +219,9 @@ def run_inductance_simulation(mesh_file, sim_dir): bdy_if_bottom.material = copper bdy_if_bottom.equation = copper_eqn + potential_force = elmer.BodyForce(sim, 'electric_potential', {'Electric Potential': 'Equals "Potential"'}) + bdy_trace.body_force = potential_force + # boundaries boundary_airbox = elmer.Boundary(sim, 'FarField', [physical['airbox_surface'][1]]) boundary_airbox.data['Electric Infinity BC'] = 'True' @@ -206,15 +234,46 @@ def run_inductance_simulation(mesh_file, sim_dir): boundary_vminus.data['Potential'] = 0.0 with tempfile.TemporaryDirectory() as tmpdir: - if sim_dir: - tmpdir = str(sim_dir) + tmpdir = sim_dir if sim_dir else Path(tmpdir) 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.absolute(), 'mesh', cwd=tmpdir, scale=[1e-3, 1e-3, 1e-3]) - elmer_solver(tmpdir) + elmer_grid(mesh_file.absolute(), 'mesh', cwd=tmpdir, scale=[1e-3, 1e-3, 1e-3], + stdout_log=(tmpdir / 'ElmerGrid_stdout.log'), + stderr_log=(tmpdir / 'ElmerGrid_stderr.log')) + solver_stdout, solver_stderr = (tmpdir / 'ElmerSolver_stdout.log'), (tmpdir / 'ElmerSolver_stderr.log') + res = elmer_solver(tmpdir, + stdout_log=solver_stdout, + stderr_log=solver_stderr) + + P, R, U_mag = None, None, None + solver_error = False + for l in res.stdout.splitlines(): + if (m := re.fullmatch(r'StatCurrentSolve:\s*Total Heating Power\s*:\s*([0-9.+-Ee]+)\s*', l)): + P = float(m.group(1)) + elif (m := re.fullmatch(r'StatCurrentSolve:\s*Effective Resistance\s*:\s*([0-9.+-Ee]+)\s*', l)): + R = float(m.group(1)) + elif (m := re.fullmatch(r'MagnetoDynamicsCalcFields:\s*ElectroMagnetic Field Energy\s*:\s*([0-9.+-Ee]+)\s*', l)): + U_mag = float(m.group(1)) + elif re.fullmatch(r'IterSolve: Linear iteration did not converge to tolerance', l): + solver_error = True + + if solver_error: + raise click.ClickException(f'Error: One of the solvers did not converge. See log files for details:\n{solver_stdout.absolute()}\n{solver_stderr.absolute()}') + elif P is None or R is None or U_mag is None: + raise click.ClickException(f'Error during solver execution. Electrical parameters could not be calculated. See log files for details:\n{solver_stdout.absolute()}\n{solver_stderr.absolute()}') + + U = math.sqrt(P*R) + I = math.sqrt(P/R) + L = 2*U_mag / (I**2) + + assert math.isclose(U, 1.0, abs_tol=1e-3) + + print(f'Coil resistance calculated by solver: {format_si(R, "Ω")}') + print(f'Inductance calucated from field: {format_si(L, "H")}') if __name__ == '__main__': run_inductance_simulation() + |