How does a permanent magnetic lifter work?

Working Principle of a Permanent Magnetic Lifter

1. Closed Magnetic Circuit Generates Strong Magnetic Force
The permanent magnetic lifter utilizes high-performance neodymium iron boron permanent magnets. Rotating the handle changes the position of the yoke, creating a closed magnetic loop within the lifter. This creates a strong magnetic field at the bottom, enabling the lifter to grasp ferromagnetic workpieces.

2. The handle switches magnetic poles
When the handle is turned from "OFF" to "ON," the relative position of the yoke changes, switching the magnetic circuit from shielded to open, instantly activating the magnetic force. Turning the handle back to "OFF" re-shields the magnetic circuit, eliminating the magnetic force and allowing for safe release.

3. V-groove Adapts to Different Workpiece Shapes
The lifter features a V-groove on its bottom, allowing it to grasp both flat and cylindrical workpieces. On cylindrical workpieces, the yoke forms two straight lines of contact with the workpiece, resulting in a suction force of approximately 30%–50% of the rated load, meeting a variety of processing requirements.

4. Safety Factor and Anti-Fault Operation Design
The design safety factor is 3–3.5 times the rated breaking force. Safety tilt blocks and locking pins are included to prevent accidental demagnetization during overloading or improper operation, ensuring safe and reliable on-site operation.

How to permanently strengthen a magnet?

1. Remagnetize to Saturation
Place the magnet in a high-magnetic field magnetizer. The strong magnetic field generated by a transient high current is used to saturate the magnet, thereby restoring or increasing its maximum remanent magnetization.

2. Magnetic Path Design to Concentrate Magnetic Flux
Adding a yoke or magnetic concentrator around the magnet concentrates the magnetic flux at the yoke, significantly increasing the attractive force. This method is widely used in industrial magnets.

3. Adding Magnetic Permeable Material
Attaching a magnetic permeable plate to the magnet surface or adding an iron sheet to the other side of the magnet allows the high magnetic permeability of the permeable material to direct the magnetic field to the contact surface, creating a localized magnetic field enhancement effect.

4. Stacking or stacking magnets
Placing or stacking multiple magnets in the same direction aligns the poles, doubling the overall magnet thickness and increasing the magnetic force approximately linearly. Maintaining a low temperature environment further enhances magnetic performance.