Applications
Where EPMs Are Used
From drone payload systems to space docking mechanisms, electropermanent magnets are enabling new capabilities across a growing range of industries.
Payload Attachment, Release & Pickup
EPMs provide a solid-state, zero-moving-parts method for attaching, releasing, and picking up payloads from drones. A brief electrical pulse switches the magnet on or off, while zero power is consumed during flight to maintain the hold. This is critical for battery-constrained aerial platforms.
For pickup operations, an EPM-equipped drone simply descends onto any object with a flat steel mating surface and energizes — no mechanical gripper geometry, no alignment precision, no actuation mechanisms. A simple steel adapter plate on the payload is all that's needed. This is dramatically simpler and more reliable than mechanical grippers, vacuum systems, or hook-and-latch mechanisms that require precise alignment and moving parts.
Products like the Zubax FluxGrip FG40 demonstrate the potential — holding 25 kgf while weighing just 70 grams. Applications include modular camera swapping (day/night), precision delivery and pickup, agricultural dispensing, and defense payloads.
Perching & Docking
EPMs enable drones to perch on ferromagnetic structures (bridges, towers, pipelines) for extended observation without hovering. They also serve as docking mechanisms for wireless charging stations, allowing autonomous landing and latching with no pilot intervention.
Research at UCI and the Army Research Lab has demonstrated EPM-based docking for drone wireless charging, with prototypes producing 60N of holding force in a compact form factor.
Key Advantages for Drones
- Zero power consumption during flight (battery life preserved)
- No moving parts — immune to vibration-induced failures
- Fail-safe: payload stays attached on power loss
- Millisecond switching for rapid pick-and-place cycles
- No magnetic interference with navigation avionics
- Lightweight — force-to-weight ratios exceeding 350:1
Drone Applications
- Modular payload swapping (cameras, sensors, dispensers)
- Drone delivery release mechanisms
- Perching on steel structures for long-duration ISR
- Autonomous docking to charging stations
- Defense payload deployment
- Agricultural spray/dispense release
Space & Aerospace
Space Docking, Separation & Deployment
The zero-power holding and reliable switching of EPMs make them ideal for the extreme constraints of space systems.
Spacecraft Docking
EPMs can serve as low-power docking mechanisms for CubeSats, servicing vehicles, and modular space stations. NASA has developed magnetic capture docking prototypes using permanent and electromagnetic hybrids. EPMs offer the advantage of maintaining a secure dock with zero power draw — critical for long-duration missions.
Payload Separation
Traditional pyrotechnic separation systems are single-use and create debris. EPM-based separation mechanisms offer repeatable, clean release with precise control. A current pulse deactivates the hold, releasing the payload with no shock, contamination, or consumable components.
Deployable Structures
Solar panels, antennas, and booms can use EPM latches for stowed-to-deployed transitions. The bi-stable nature of EPMs (latched in both ON and OFF states) eliminates the need for hold-down power during launch, and the deployment pulse energy is minimal.
On-Orbit Servicing & Assembly
For in-space assembly of large structures, EPM connectors provide reversible, power-free joints between modules. The ELSA-d mission demonstrated electromagnetic docking for debris removal. EPMs extend this concept with zero holding power for long-duration berthing.
CubeSat & SmallSat Systems
The compact size and low mass of EPMs make them a natural fit for CubeSats, where every gram and milliwatt counts. Applications include inter-satellite docking for constellation formation, instrument deployment, and deorbiting mechanisms.
Space Debris Capture
Active debris removal missions can use EPMs to magnetically capture and secure tumbling ferromagnetic objects. The ability to switch from attractive to neutral eliminates the risk of unintended capture of non-target debris during approach.
Inspection & Climbing
Climbing Robots & Structural Inspection
EPMs provide the ideal adhesion mechanism for robots that traverse ferromagnetic structures — switchable grip with zero holding power.
Why EPMs for Climbing Robots?
Magnetic adhesion is the most common mechanism for robots inspecting ferromagnetic structures. Permanent magnets provide constant force that can't be released, while electromagnets drain batteries continuously. EPMs solve both problems — they switch on/off with a brief pulse and hold with zero power.
By controlling the pulse amplitude, the adhesion force can be tuned to a desired value, enabling smooth gait transitions on complex geometries. This variable-force capability is unique to EPMs.
Notable Research
MARVEL (Science Robotics) — An untethered quadrupedal climbing robot achieving the fastest vertical and inverted walking speeds, using integrated EPM feet with magnetorheological elastomers for high adhesion and traction.
Magnecko — A quadrupedal robot using EPMs for adhesion on ferrous surfaces, capable of walking on ground, vertical walls, and inverted overhangs while carrying additional payloads.
Target Structures
- Ship hulls and ballast tanks
- Storage tanks and pressure vessels
- Steel bridges and overpasses
- Wind turbine towers
- Oil & gas pipelines and platforms
- Steel building frameworks
- Power plant boilers and heat exchangers
Inspection Tasks
- Visual and thermal crack detection
- Weld seam inspection
- Corrosion mapping and thickness measurement
- Non-destructive testing (NDT) sensor deployment
- Coating condition assessment
- Confined space inspection (tanks, holds)
ROV Station-Keeping
EPMs allow ROVs to magnetically latch onto steel subsea structures — pipelines, risers, platform jackets — for hands-free inspection without continuous thruster use. This conserves power and eliminates positioning drift from currents.
AUV Docking
Resident AUV systems need reliable docking to subsea garages for recharging. EPMs provide a robust, self-aligning magnetic latch that maintains hold through zero power — essential for long-duration autonomous subsea operations.
Subsea Tool & Payload Attachment
Underwater manipulators can use EPM grippers to pick up and release ferromagnetic tools, anodes, or equipment on the seabed without complex mechanical end-effectors that are vulnerable to corrosion and marine growth.
SMORES-EP (UPenn)
Self-assembling modular robot for extreme shapeshifting. Each module has four EPM-equipped faces that form strong, switchable connections with other modules or metal objects. Modules self-assemble into task-specific configurations — snakes, arms, wheels, and more.
Robot Pebbles & M-Blocks (MIT)
MIT's Robot Pebbles use EPMs for attachment between cube-shaped modules that self-disassemble into target shapes. M-Blocks use EPMs with inertial actuation to pivot, rotate, and jump, forming arbitrary 3D structures through self-assembly.
Self-Aligning EPM Connectors
Recent research on planar EPM arrays (EP-Face connectors) provides self-aligning, rapid-switching interfaces for modular systems. Applications extend beyond robotics to EV charging ports, domestic robot docking, and aerospace module assembly.
CNC Workholding
Electropermanent magnetic chucks provide uniform, vibration-free clamping for milling, grinding, turning, and EDM. Five-side machining access in a single setup eliminates re-fixturing. No power needed during cuts — intrinsically safe during outages. Used in automotive (IATF 16949) and aerospace (AS9100) production.
Heavy Lifting & Sheet Handling
Industrial EPM lifters safely handle steel plates, beams, coils, and forgings in steel mills, ports, shipyards, and fabrication shops. Holding forces up to multiple tons per unit. Fail-safe — load is retained on power loss, with no backup batteries required.
Mold & Die Clamping
Quick mold change (QMC) and quick die change (QDC) systems use EPMs to clamp molds and dies in injection molding and stamping presses. Changeover times are reduced by up to 95% compared to manual bolting, dramatically increasing production flexibility.
Robotic Grippers & End Effectors
EPM grippers on industrial robot arms provide fast, clean pick-and-place of ferromagnetic parts. No compressed air (vs. vacuum grippers), no mechanical jaws to wear out, and precise force control through pulse tuning. Ideal for sheet metal, stampings, and machined parts.
Magnetic Brakes & Clutches
Bi-stable EPM brakes and clutches maintain engagement or disengagement without continuous power. Used in servo systems, conveyor stops, rotary indexing, and safety hold applications where fail-safe holding is required.
Magnetic Fixturing & Jigging
Welding fixtures, assembly jigs, and inspection holders use EPMs for rapid, repeatable positioning of ferromagnetic workpieces. Instant on/off switching speeds setup while uniform magnetic holding eliminates part distortion from clamping forces.
Emerging
Emerging & Research Applications
Active research is extending EPM technology into new domains.
Compliant & Soft Robotics
Yale researchers have developed compliant EPMs — flexible magnetic elements that can be embedded in soft robotic structures. By varying material mixing ratios, mechanical compliance can be tuned without sacrificing switchable magnetic function. This opens EPMs to grippers, wearables, and bio-inspired robots.
Programmable Matter
EPMs serve as the connection and actuation mechanism for programmable matter research — systems of small modules that can autonomously rearrange into arbitrary shapes. MIT's ElectroVoxel demonstrated untethered reconfiguration in simulated microgravity and on parabolic flights.
EV Battery Quick-Release
Self-aligning EPM connectors are being explored for electric vehicle battery swapping systems. The zero-power hold, precise alignment, and instant release properties map well to the requirements of rapid, automated battery exchange in EVs and electric drones.
Magnetic Locks & Access Control
EPMs provide bi-stable magnetic locks that are locked or unlocked without continuous power. Unlike electromagnetic locks that release on power failure, EPM locks maintain their state — configurable as either fail-secure or fail-safe depending on the default magnetization state.
Wearable Electronics — Project Aria
Meta's Project Aria research glasses use sub-gram EPMs for modular sensor pod attachment, demonstrating that EPM technology scales down to the millimeter level. These tiny magnets fit within eyewear temple arms, providing zero-power magnetic hold that can be electrically released for pod swapping — no mechanical latches, clips, or springs required. This represents the extreme miniaturization end of EPM design.
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