Electro-Permanent Magnet Technology
What is Electro-Permanent Magnet?
An electro-permanent magnet (EPM) combines the advantages of both permanent magnets and electromagnets. It uses a brief electrical pulse to switch the magnetic field on or off, but requires no continuous power to maintain the magnetic force. This makes it ideal for industrial lifting applications where safety and energy efficiency are critical.
The core principle involves using two types of permanent magnets with different coercivity. A short current pulse changes the magnetic orientation of the low-coercivity magnet, while the high-coercivity magnet remains unchanged. This creates or cancels the external magnetic field without ongoing energy consumption.
How EPM Works vs Traditional Magnets
| Feature | Electro-Permanent Magnet | Traditional Electromagnet | Permanent Magnet |
|---|---|---|---|
| Power Requirement | Brief pulse only | Continuous power needed | No power needed |
| Safety During Power Loss | Safe - retains magnetism | Unsafe - drops load | Always magnetic |
| Energy Consumption | Very low | High | None |
| On/Off Control | Yes - instant switching | Yes | No - always on |
| Lifting Capacity Stability | Stable | Varies with voltage | Stable but uncontrollable |
Core Advantages
Instant Activation
Requires only a brief current pulse to activate or deactivate the magnetic field, enabling rapid cycle times in production environments.
Zero Continuous Power
Once activated, no electricity is needed to maintain the magnetic force, significantly reducing energy costs compared to traditional electromagnets.
Fail-Safe Operation
In case of power failure, the magnet retains its full holding force, eliminating the risk of dropped loads and ensuring workplace safety.
Precise Control
Magnetic force can be precisely controlled and adjusted through the control system, allowing for delicate handling of various materials.
Long Service Life
With no moving parts and minimal electrical stress, EPM systems offer exceptional durability and require minimal maintenance over decades of operation.
Environmental Friendly
Low energy consumption and zero emissions during operation make EPM technology an environmentally sustainable choice for industrial applications.
Technical Documentation
Patent Portfolio (53 Patents)
Qianhao Magnetics holds 53 patents in electro-permanent magnet technology, including:
- •3 Invention Patents for core EPM structural designs
- •12 Utility Model Patents for application-specific improvements
- •38 Design Patents for product appearance and interface innovations
Our patent portfolio covers full-coverage magnetic circuits, single-sheet separation mechanisms, fail-safe locking systems, and intelligent control algorithms.
Industry FAQ
How to choose the right EP lifter for my application?
Selection depends on plate thickness, width, weight, and production cycle requirements. Our engineering team provides free consultation to match the optimal magnet configuration for your specific needs.
What is the safety factor of EP lifting magnets?
Our EPM lifters are designed with a minimum safety factor of 3:1 against rated capacity, exceeding international standards. The fail-safe design ensures load retention even during complete power loss.
Can EP magnets be used in hazardous environments?
Yes. EPM systems can be integrated with robotic manipulators for remote operation in hazardous environments such as high-temperature zones, chemical processing areas, or confined spaces, keeping personnel at safe distances.
Maintenance requirements of EPM systems
EPM systems require minimal maintenance due to their solid-state design. Recommended annual inspection includes checking electrical connections, verifying magnetic force output, and inspecting mechanical mounting points. No lubrication or moving part replacement is typically needed.
Video Resources
Product Demonstration
Full-coverage EPM magnet in action at laser cutting line
Customer Site Operations
Real-world application at SANY lighthouse factory
Technical Animation
How electro-permanent magnet technology works