DXF File generation for IPMSM machine

[TangiPilabz]

As I am new to pyleecan, I prompted ChatGPT to write code using pyleecan to generate a DXF file for an IPMSM machine with 12 slots and 8 poles with default geometry. But it used some classes which are not found in pyleecan - SlotMPolar, SlotMFlat - for the Rotor slot for Magnets. Here is the code generated by ChatGPT to create the DXF file:

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from pyleecan.Classes.MachineIPMSM import MachineIPMSM
from pyleecan.Classes.Shaft import Shaft
from pyleecan.Classes.LamSlotMag import LamSlotMag
from pyleecan.Classes.LamSlotWind import LamSlotWind
from pyleecan.Classes.WindingUD import WindingUD
from pyleecan.Classes.SlotW12 import SlotW12 # Stator slot type
from pyleecan.Classes.SlotMFlat import SlotMFlat # Rotor slot for magnets
from pyleecan.Functions.GMSH.export import export_geometry

Define the stator with 12 slots

stator = LamSlotWind(
Rint=0.1, # Stator inner radius
Rext=0.2, # Stator outer radius
is_internal=False, # Stator is external
is_stator=True, # It's the stator
L1=0.1, # Stack length (axial length)
Nrvd=0, # No radial ventilation ducts
Winding=WindingUD(qs=3), # Define a 3-phase winding
)

Define stator slots (12 slots using SlotW12)

stator.slot = SlotW12(
Zs=12, # Number of stator slots
H0=0.01, # Slot opening height
H1=0.02, # Slot height below the opening
H2=0.03, # Slot total height
W0=0.01, # Slot opening width
W1=0.015, # Slot width at base
W2=0.025 # Slot width at bottom
)

Define the rotor with 8 poles (using SlotMFlat for magnets)

rotor = LamSlotMag(
Rint=0, # Rotor inner radius
Rext=0.1, # Rotor outer radius
is_internal=True, # Rotor is internal
is_stator=False, # It's the rotor
L1=0.1, # Stack length (axial length)
Nrvd=0, # No radial ventilation ducts
)

Define rotor slots for magnets (8 poles using SlotMFlat)

rotor.slot = SlotMFlat(
Zs=8, # Number of rotor poles
W0=0.02, # Width of magnet at its base
H0=0.03, # Magnet height
Wmag=0.02, # Magnet width
Hmag=0.03 # Magnet height
)

Define the machine with stator and rotor

ipmsm_machine = MachineIPMSM(
stator=stator,
rotor=rotor,
shaft=Shaft(Drsh=0.02), # Shaft diameter
name="IPMSM_12slots_8poles"
)

Export geometry to DXF

output_dir = "./dxf_output/"
stator_dxf_filename = output_dir + "stator_12slots.dxf"
rotor_dxf_filename = output_dir + "rotor_8poles.dxf"

Export the stator geometry to DXF

export_geometry(lam=stator, file_path=stator_dxf_filename)
print(f"Stator DXF saved to {stator_dxf_filename}")

Export the rotor geometry to DXF

export_geometry(lam=rotor, file_path=rotor_dxf_filename)
print(f"Rotor DXF saved to {rotor_dxf_filename}")

---

Appreciate if this code can be corrected to generate the DXF file for an IPMSM or any type of motor.

Thanks and regards
TangiPilabz

[BonneelP]

Hello,

Regarding the slot types, they were renamed. Try SlotM10 for rectangular and SlotM11 for polar (schematics in the GUI). By the way these magnets are for SPMSM machines. For IPMSM you should be looking for "Hole" objects. I recommend using the GUI to define your machine to find the proper objects/schematics.

Direct export to DXF is not possible in pyleecan. You can use the automated coupling with FEMM to draw your machine, open the resulting .fem file in FEMM and then FEMM provides a feature to export to .dxf

Best regards,
Pierre

[TangiPilabz]

Hello,

I see. I thought since Pyleecan has in-built build_geometry functions for various topologies, I was trying to generate DXF file programmatically. But since you mentioned that direct DXF is not possible in pyleecan, is it possible to generate .fem file programmatically after specifying the stator and rotor dimensions and other details?

Thanks and regards
Tangi

[BonneelP]

Yes first you define your machine object with all the parameters, then build_geometry will return a generic representation of the surfaces and lines required to draw the machine in 2D and finally draw_FEMM will take these surface and define the corresponding machine in FEMM in a .fem file. As a first step you can check what the GUI generates:

Technically we could go from the generic surfaces to DXF directly but it would require some developments.