def draw_FEMM(self,
nodeprop=None,
maxseg=None,
propname=None,
hide=False,
group=None):
"""Draw the Arc object in FEMM and assign the property
Parameters
----------
nodeprop :
Nodal property
(Default value = None)
maxseg :
Meshed with elements that span at most maxsegdeg degrees per element
(Default value = None)
propname :
Boundary property ’propname’
(Default value = None)
hide :
0 = not hidden in post-processor, 1 == hidden in post processor
(Default value = False)
group :
the group the Arc1 object belongs
(Default value = None)
Returns
-------
None
"""
# Get BC (if any)
if self.label in boundary_prop:
propname = boundary_prop[self.label]
# Create the nodes
begin = self.get_begin()
end = self.get_end()
X1, Y1 = begin.real, begin.imag
X2, Y2 = end.real, end.imag
femm.mi_addnode(X1, Y1)
femm.mi_selectnode(X1, Y1)
femm.mi_setnodeprop(nodeprop, group)
femm.mi_clearselected()
femm.mi_addnode(X2, Y2)
femm.mi_selectnode(X2, Y2)
femm.mi_setnodeprop(nodeprop, group)
femm.mi_clearselected()
# Create the arc
angle = self.get_angle(is_deg=True)
if angle > 0:
femm.mi_addarc(X1, Y1, X2, Y2, angle, 2)
else:
femm.mi_addarc(X2, Y2, X1, Y1, -angle, 2)
# Set Arc properties
Zm = self.get_middle()
femm.mi_selectarcsegment(Zm.real, Zm.imag)
femm.mi_setarcsegmentprop(maxseg, propname, hide, group)
femm.mi_clearselected()
def draw_FEMM(
output,
is_mmfr,
is_mmfs,
sym,
is_antiper,
type_calc_leakage,
is_remove_vent=False,
is_remove_slotS=False,
is_remove_slotR=False,
type_BH_stator=0,
type_BH_rotor=0,
kgeo_fineness=1,
kmesh_fineness=1,
user_FEMM_dict={},
path_save="FEMM_model.fem",
is_sliding_band=True,
transform_list=[],
rotor_dxf=None,
stator_dxf=None,
):
"""Draws and assigns the property of the machine in FEMM
Parameters
----------
output : Output
Output object
is_mmfr : bool
1 to compute the rotor magnetomotive force / rotor
magnetic field
is_mmfs : bool
1 to compute the stator magnetomotive force/stator
magnetic field
type_calc_leakage : int
0 no leakage calculation
1 calculation using single slot
is_remove_vent : bool
True to remove the ventilation ducts in FEMM (Default value = False)
is_remove_slotS : bool
True to solve without slot effect on the Stator (Default value = False)
is_remove_slotR : bool
True to solve without slot effect on the Rotor (Default value = False)
type_BH_stator: int
2 Infinite permeability, 1 to use linear B(H) curve according to mur_lin, 0 to use the B(H) curve
type_BH_rotor: bool
2 Infinite permeability, 1 to use linear B(H) curve according to mur_lin, 0 to use the B(H) curve
kgeo_fineness : float
global coefficient to adjust geometry fineness
in FEMM (1: default ; > 1: finner ; < 1: less fine)
kmesh_fineness : float
global coefficient to adjust mesh fineness
in FEMM (1: default ; > 1: finner ; < 1: less fine)
sym : int
the symmetry applied on the stator and the rotor (take into account antiperiodicity)
is_antiper: bool
To apply antiperiodicity boundary conditions
rotor_dxf : DXFImport
To use a dxf version of the rotor instead of build_geometry
stator_dxf : DXFImport
To use a dxf version of the stator instead of build_geometry
Returns
-------
FEMM_dict : dict
Dictionnary containing the main parameters of FEMM (including circuits and materials)
"""
# Initialization from output for readibility
BHs = output.geo.stator.BH_curve # Stator B(H) curve
BHr = output.geo.rotor.BH_curve # Rotor B(H) curve
Is = output.elec.Is # Stator currents waveforms
Ir = output.elec.Ir # Rotor currents waveforms
machine = output.simu.machine
# Computing parameter (element size, arcspan...) needed to define the simulation
FEMM_dict = comp_FEMM_dict(machine, kgeo_fineness, kmesh_fineness,
type_calc_leakage)
FEMM_dict.update(user_FEMM_dict) # Overwrite some values if needed
# The package must be initialized with the openfemm command.
try:
femm.openfemm()
except Exception as e:
raise FEMMError(
"ERROR: Unable to open FEMM, please check that FEMM is correctly installed\n"
+ str(e))
# We need to create a new Magnetostatics document to work on.
femm.newdocument(0)
# Minimize the main window for faster geometry creation.
femm.main_minimize()
# defining the problem
femm.mi_probdef(0, "meters", FEMM_dict["pbtype"], FEMM_dict["precision"])
# Modifiy the machine to match the conditions
machine = type(machine)(init_dict=machine.as_dict())
if is_remove_slotR: # Remove all slots on the rotor
lam_dict = machine.rotor.as_dict()
machine.rotor = Lamination(init_dict=lam_dict)
if is_remove_slotS: # Remove all slots on the stator
lam_dict = machine.stator.as_dict()
machine.stator = Lamination(init_dict=lam_dict)
if is_remove_vent: # Remove all ventilations
machine.rotor.axial_vent = list()
machine.stator.axial_vent = list()
# Building geometry of the (modified) stator and the rotor
surf_list = list()
lam_list = machine.get_lam_list()
lam_int = lam_list[0]
lam_ext = lam_list[1]
# Adding no_mesh for shaft if needed
if lam_int.Rint > 0 and sym == 1:
surf_list.append(
Circle(point_ref=0, radius=lam_int.Rint, label="No_mesh"))
# adding the Airgap surface
if is_sliding_band:
surf_list.extend(
get_sliding_band(sym=sym, lam_int=lam_int, lam_ext=lam_ext))
else:
surf_list.extend(get_airgap_surface(lam_int=lam_int, lam_ext=lam_ext))
# adding Both laminations surfaces (or import from DXF)
if rotor_dxf is not None:
femm.mi_readdxf(rotor_dxf.file_path)
surf_list.extend(rotor_dxf.get_surfaces())
else:
surf_list.extend(machine.rotor.build_geometry(sym=sym))
if stator_dxf is not None:
femm.mi_readdxf(stator_dxf.file_path)
surf_list.extend(stator_dxf.get_surfaces())
else:
surf_list.extend(machine.stator.build_geometry(sym=sym))
# Applying user defined modifications
for transfrom in transform_list:
for surf in surf_list:
if transfrom["label"] in surf.label and transfrom[
"type"] == "rotate":
surf.rotate(transfrom["value"])
elif transfrom["label"] in surf.label and transfrom[
"type"] == "translate":
surf.translate(transfrom["value"])
# Creation of all the materials and circuit in FEMM
prop_dict, materials, circuits = create_FEMM_materials(
machine,
surf_list,
Is,
Ir,
BHs,
BHr,
is_mmfs,
is_mmfr,
type_BH_stator,
type_BH_rotor,
is_eddies,
j_t0=0,
)
create_FEMM_boundary_conditions(sym=sym, is_antiper=is_antiper)
# Draw and assign all the surfaces of the machine
for surf in surf_list:
label = surf.label
# Get the correct element size and group according to the label
surf.draw_FEMM(
nodeprop="None",
maxseg=FEMM_dict["arcspan"], # max span of arc element in degrees
propname="None",
FEMM_dict=FEMM_dict,
hide=False,
)
assign_FEMM_surface(surf, prop_dict[label], FEMM_dict, machine.rotor,
machine.stator)
# Apply BC for DXF import
if rotor_dxf is not None:
for BC in rotor_dxf.BC_list:
if BC[1] is True: # Select Arc
femm.mi_selectarcsegment(BC[0].real, BC[0].imag)
femm.mi_setarcsegmentprop(FEMM_dict["arcspan"], BC[2], False,
None)
else: # Select Line
femm.mi_selectsegment(BC[0].real, BC[0].imag)
femm.mi_setsegmentprop(BC[2], None, None, False, None)
femm.mi_clearselected()
femm.mi_zoomnatural() # Zoom out
femm.mi_probdef(
FEMM_dict["freqpb"],
"meters",
FEMM_dict["pbtype"],
FEMM_dict["precision"],
FEMM_dict["Lfemm"],
FEMM_dict["minangle"],
FEMM_dict["acsolver"],
)
femm.smartmesh(FEMM_dict["smart_mesh"])
femm.mi_saveas(path_save) # Save
# femm.mi_close()
FEMM_dict["materials"] = materials
FEMM_dict["circuits"] = circuits
return FEMM_dict
def draw_FEMM(self, nodeprop=None, maxseg=None, propname=None, hide=False, group=None):
"""Draw the Arc object in FEMM and assign the property
Parameters
----------
nodeprop :
Nodal property
(Default value = None)
maxseg :
Meshed with elements that span at most maxsegdeg degrees per element
(Default value = None)
propname :
Boundary property ’propname’
(Default value = None)
hide :
0 = not hidden in post-processor, 1 == hidden in post processor
(Default value = False)
group :
the group the Arc1 object belongs
(Default value = None)
Returns
-------
None
"""
# Get BC (if any)
for bound_label in boundary_prop:
if bound_label in self.label:
propname = boundary_prop[bound_label]
# split if arc angle > 180
angle = self.get_angle(is_deg=True)
# Create the nodes
begin = self.get_begin()
mid = self.get_middle()
end = self.get_end()
X1, Y1 = begin.real, begin.imag
X2, Y2 = mid.real, mid.imag
X3, Y3 = end.real, end.imag
femm.mi_addnode(X1, Y1)
femm.mi_selectnode(X1, Y1)
femm.mi_setnodeprop(nodeprop, group)
femm.mi_clearselected()
femm.mi_addnode(X3, Y3)
femm.mi_selectnode(X3, Y3)
femm.mi_setnodeprop(nodeprop, group)
femm.mi_clearselected()
if abs(angle) > 180:
femm.mi_addnode(X2, Y2)
femm.mi_selectnode(X2, Y2)
femm.mi_setnodeprop(nodeprop, group)
femm.mi_clearselected()
# invert the nodes
if angle < 0:
angle = -angle
X1, Y1, X3, Y3 = X3, Y3, X1, Y1
if angle > 180:
femm.mi_addarc(X1, Y1, X2, Y2, angle / 2, 2)
femm.mi_addarc(X2, Y2, X3, Y3, angle / 2, 2)
else:
femm.mi_addarc(X1, Y1, X3, Y3, angle, 2)
# Set Arc properties
if angle > 180:
cent = self.get_center()
mid1 = cent + (mid - cent) * exp(1j * angle / 4)
mid2 = cent + (mid - cent) * exp(-1j * angle / 4)
femm.mi_selectarcsegment(mid1.real, mid1.imag)
femm.mi_selectarcsegment(mid2.real, mid1.imag)
else:
femm.mi_selectarcsegment(X2, Y2)
femm.mi_setarcsegmentprop(maxseg, propname, hide, group)
femm.mi_clearselected()