Shape Class Hierarchy

Class Inheritance

Each engine contains nested shape classes that implement specific core geometries. The class hierarchy follows the EN 60205 standard grouping:

classDiagram
    class IPiece {
        <<abstract>>
        +get_shape_base(data)*
        +get_negative_winding_window(dimensions)*
        +get_piece(data)
        +get_plate(data)
        +get_piece_technical_drawing(data)
        +apply_machining(piece, machining, dimensions)
        +get_dimensions_and_subtypes()
    }

    class E {
        +get_shape_base(data)
        +get_negative_winding_window(dimensions)
    }

    class P {
        +get_shape_base(data)
        +get_negative_winding_window(dimensions)
    }

    class U {
        +get_shape_base(data)
        +get_negative_winding_window(dimensions)
    }

    class T {
        +get_shape_base(data)
        +get_negative_winding_window(dimensions)
    }

    IPiece <|-- E
    IPiece <|-- P
    IPiece <|-- U
    IPiece <|-- T

    E <|-- Er
    E <|-- Ep
    E <|-- Epx
    E <|-- Efd
    E <|-- El

    Er <|-- Etd
    Er <|-- Lp
    Er <|-- Eq
    Er <|-- Ec

    P <|-- Pq
    P <|-- Rm
    P <|-- Pm

    IPiece <|-- Ur
    IPiece <|-- Ut
    U <|-- C

Shape Families and EN 60205 Naming

Class	Family	EN 60205 Name	Base Class
E	E	E cores	IPiece
Etd	ETD	E cores, round center leg	Er
Er	ER	E cores, round center leg	E
Ep	EP	E cores, pot-like	E
Epx	EPX	E cores, pot-like extended	E
Efd	EFD	E cores, flat design	E
Ec	EC	E cores, cylindrical	Er
Eq	EQ	E cores, square	Er
El	EL	E cores, low profile	E
Lp	LP	Low-profile planar	Er
P	P	Pot cores	IPiece
Pq	PQ	Pot cores, quasi-planar	P
Pm	PM	Pot cores, modified	P
Rm	RM	Pot cores, rectangular	P
U	U	U cores	IPiece
Ur	UR	U cores, round	IPiece
Ut	UT	U cores, T-shape	IPiece
C	C	Cut C-cores	U
T	T	Toroidal cores	IPiece

Dimension Naming Convention

All shapes use single-letter dimension names from EN 60205:

Dimension	Meaning
A	Overall width (largest horizontal dimension)
B	Overall height of one half
C	Winding window height
D	Center leg height (below winding window)
E	Center leg width or outer leg spacing
F	Center leg depth / diameter
G	Additional dimension (shape-specific)
H	Additional dimension (shape-specific)
J	Additional dimension (RM family)

Subtypes

Some shape families have multiple subtypes (1-4), each with different dimension sets:

# P family has 4 subtypes
P_DIMENSIONS_AND_SUBTYPES = {
    1: ["A", "B", "C", "D", "E", "F", "G", "H"],
    2: ["A", "B", "C", "D", "E", "F", "G", "H"],
    3: ["A", "B", "D", "E", "F", "G", "H"],
    4: ["A", "B", "C", "D", "E", "F", "G", "H"],
}

# RM family has 4 subtypes
RM_DIMENSIONS_AND_SUBTYPES = {
    1: ["A", "B", "C", "D", "E", "F", "G", "H", "J"],
    ...
}