Toroidal Cores¶

Ring-shaped (toroidal) cores used in EMI filters, current sensors, and applications requiring minimal stray flux.

T - Toroidal Core¶

The simplest core geometry - a ring with only three dimensions.

Dimension	Description
A	Outer diameter
B	Inner diameter
C	Height (ring thickness)

Class hierarchy: T(IPiece)

Key Properties¶

Single piece: No mating surfaces (uses "type": "closed piece")
No winding window cutout: The center hole is the winding window
Minimal stray flux: Fully enclosed magnetic path
Revolution geometry: Created by revolving a rectangle around the Y axis

Example¶

from OpenMagneticsVirtualBuilder.builder import Builder
import copy

builder = Builder("CadQuery")

t_shape = {
    "family": "t",
    "name": "T 25/15/10",
    "familySubtype": "1",
    "dimensions": {
        "A": {"nominal": 0.0254},
        "B": {"nominal": 0.0152},
        "C": {"nominal": 0.0102},
    }
}

geo_desc = [
    {
        "type": "closed piece",
        "shape": copy.deepcopy(t_shape),
        "rotation": [0, 0, 0],
        "coordinates": [0, 0],
        "machining": None,
    }
]

step_path, stl_path = builder.get_core("T_25_15_10", geo_desc, output_path="./output/")

Toroidal Winding¶

For a complete toroidal magnetic with windings, see the Toroidal Winding Tutorial.

Coordinate System¶

Unlike concentric cores, toroidal cores use a cylindrical coordinate mapping:

MAS Coordinate	CadQuery Axis	Meaning
`coordinates[0]`	Radial from Y	Distance from center
`coordinates[1]`	Angle around Y	Angular position