The Electro-Permanent Magnet Company
Efficiency Meets Force
We design, build, and produce electropermanent magnet systems — from FEA-optimized magnetic circuits and custom driver electronics to volume manufacturing. Over one million magnet assemblies delivered.
Switchable. Permanent. Zero Power.
An EPM combines two magnets — NdFeB (permanent, high coercivity) and AlNiCo (switchable, medium coercivity) — wrapped by a coil. A brief current pulse flips the AlNiCo to turn the external field on or off.
Both states hold indefinitely with no electricity. Power is only needed for the momentary switching pulse.
Zero holding power
Magnetic state persists with no electrical input. Dramatically reduced energy consumption compared to electromagnets.
Fail-safe operation
Up to 380 kgf per individual module. State is stored in the magnets themselves — grip is maintained through power failures with no backup systems required.
Millisecond switching
1–10 ms state changes with a short current pulse. No thermal buildup, no moving parts, no mechanical wear.
Compact and robust
A single module can hold up to 480× its own weight. Solid-state — no large coils, no cooling systems, no moving parts. Significantly smaller than equivalent electromagnet assemblies.
Force vs. Air Gap
This simplified EPM design demonstrates how holding force varies with air gap distance. Drag the slider or press play to see force decay as the gap increases from 0 to 5mm.
B = magnetic flux density at the pole face (Tesla). This is a generic EPM geometry modeled with 2D axisymmetric finite element analysis, roughly representative of a 250g-class module under ideal conditions. Force calculated via Maxwell stress tensor on 1018 low-carbon steel. Actual performance varies with geometry, materials, and environment — see product specifications for measured data.
Where EPMs Excel
Deployed across a growing range of industries — from drone payloads to factory floors.
UAV Payload Systems
Zero-power payload hold, release, and pickup during flight. Simpler and lighter than mechanical grippers.
Learn more →Proven at Scale
Over one million magnet assemblies produced. Standard EPM modules from 100 g to 1 kg. Adhesion-to-weight ratios from 320:1 to 480:1. Production in USA and Asia.
Our EPM-250 flagship module weighs 250 grams and holds 120 kgf on bare steel — a 480:1 ratio. A single 250 g EPM can secure a 60 kg payload with a 2× safety factor, drawing zero power during flight or operation.
We handle the full stack: FEA-optimized magnetic circuit design, custom driver electronics with your choice of communication protocol, and volume manufacturing backed by qualified material suppliers.
Ready to Integrate EPM Technology?
Whether you're exploring feasibility or ready to deploy, our team can guide your EPM project from concept to production.
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