PyMMM 0.7.12

Python wrapper for MMM module

PyMMM - Würth Elektronik Magnetic Modeling Module

Python wrapper over OpenMagnetics for flyback transformer and current transformer selection from Würth's catalog.

Features

• Energy-based magnetic filtering - Quickly filter catalog by storable energy
• Virtual magnetics - Generate winding combinations from real products
• Flyback/CT design - Process design inputs for flyback and current transformers
• Full simulation - Core losses, winding losses, temperature rise calculations
• Visualization - SVG plots of cores, windings, and magnetic fields

Installation

pip install wheelhouse/pymmm-*.whl

Quick Start

import PyMMM

# Load catalog
PyMMM.load_magnetics_from_file("flybacks.ndjson", expand=True)

# Define requirements
inputs = {
    "inputVoltage": {"minimum": 85, "maximum": 265},
    "operatingPoints": [{
        "outputVoltages": [12],
        "outputCurrents": [1],
        "switchingFrequency": 100000,
        "mode": "Discontinuous Conduction Mode"
    }]
}

# Filter by energy
PyMMM.compute_energy_cache(100, inputs)
min_energy = PyMMM.calculate_flyback_required_magnetic_energy(inputs)
refs = PyMMM.filter_magnetics_by_energy(min_energy, min_energy * 2)

# Get virtual magnetics
for ref in refs:
    result = PyMMM.calculate_virtual_magnetics_by_reference(ref, inputs, True)
    print(result["virtualMagnetics"])

Building from Source

# Build wheel
python3 -m pipx run build

# Or with cibuildwheel for manylinux
cibuildwheel

Documentation

See llms.txt for detailed API documentation and usage patterns.

API Reference

Run help(PyMMM) or help(PyMMM.function_name) for function documentation.

Key Functions

Function	Description
load_magnetics_from_file	Load catalog from NDJSON
compute_energy_cache	Precompute storable energy
filter_magnetics_by_energy	Filter by energy range
calculate_virtual_magnetics_by_reference	Generate winding combinations
filter_magnetics_by_flow	Score and rank magnetics
devirtualize_mas_by_reference	Map virtual to real product
calculate_saturation_current	Calculate saturation current

License

Proprietary - Würth Elektronik