How to change the number of segments within an single arc?

[HarriVihriaelae]

Hello to everyone,

I am making a band in Maxwell. for the inner arc I would need a high number of segments, but the other sides should remain intact. xsection_num_seg does not work. Is there any other method than defining two coaxial circles, subtracting the inner cirlece and splitting the remining ring to a given lenght?

BR,
Harri

points_for_region=[
[r_o+10 ,0 ,0],
[(r_o+10)math.cos(2math.pi/partm/2) ,(r_o+10)math.sin(2math.pi/partm/2) ,0],
[(r_o+10)math.cos(2math.pi/partm) ,(r_o+10)math.sin(2math.pi/partm) ,0],
[(r_i_stator-tooth_h-yoke_h-10)math.cos(2math.pi/partm) ,(r_i_stator-tooth_h-yoke_h-10)math.sin(2math.pi/partm) ,0],
[(r_i_stator-tooth_h-yoke_h-10)math.cos(2math.pi/partm/2) ,(r_i_stator-tooth_h-yoke_h-10)math.sin(2math.pi/partm/2) ,0],
[(r_i_stator-tooth_h-yoke_h-10) ,0 ,0],
[r_o+10 ,0 ,0],
]
line_segments_region = [ "Arc", "Line", "Arc","Line"]
region_id= m2d.modeler.create_polyline(
points_for_region,
segment_type=line_segments_region,
name="Region",
close_surface=True,
cover_surface=True,
)

[anur7]

Hi @HarriVihriaelae,

Here an example that contains a bunch of polylines with 2 angular arcs:

import ansys.aedt.core
from ansys.aedt.core.modeler.cad.primitives import PolylineSegment

m2d = ansys.aedt.core.Maxwell2d(version="2025.2")

ref_points = [
    [0.4, 0, 0],
    [-0.4, -0.6, 0],
    [0.4, 0, 0]]

my_geometry = m2d.modeler.create_polyline(
    points=ref_points,
    segment_type=[PolylineSegment(segment_type="AngularArc", arc_center=[0, 0, 0], arc_angle="180deg", arc_plane="XY"),
                  PolylineSegment(segment_type="Line"),
                  PolylineSegment(segment_type="AngularArc", arc_center=[0, -0.6, 0], arc_angle="180deg",
                                  arc_plane="XY"),
                  PolylineSegment(segment_type="Line")],
    close_surface=True,
    name="test"
)

m2d.release_desktop(False, False)

When you want to create a geometry out of a group of ploylines you define a list of PolylineSegments in the segment_type argument of the create_polyline method.

Hope this helps.

[HarriVihriaelae]

Hello Anur,

Thank you very much for yout input. I expressed myself unclear. I wanted to make an inner angular arc a given no. of segments, here haned as "segments" . I came up myself with this code:

from pyaedt.modeler.cad.polylines import PolylineSegment

start_point = ["(r_o+5mm)cos(2pi/partm)", "(r_o+5mm)sin(2pi/partm)", "0mm"]
arc_center = ["0mm", "0mm", "0mm"]
end_of_line_segment_1 = ["(r_i_stator + delta / 2)", "0mm" ,"0mm"]
arc_angle_1 = "-360deg/partm"
arc_angle_2 = "360deg/partm"

band_id=m2d.modeler.create_polyline(
points=[start_point, end_of_line_segment_1, start_point],
segment_type=[
m2d.modeler.polyline_segment(
type="AngularArc", arc_angle=arc_angle_1, arc_center=arc_center,arc_plane= "XY"
),
m2d.modeler.polyline_segment(type="Line"),
m2d.modeler.polyline_segment(
type="AngularArc", arc_angle=arc_angle_2, num_seg="segments", arc_center=arc_center, arc_plane= "XY"
),
m2d.modeler.polyline_segment(type="Line"),
],
name="Band",
close_surface=True,
cover_surface=True,
)