Magnetic Lifter: Innovating and Applying Neodymium Magnets in Its Technology

In the fields of machinery industry, mold manufacturing, and steel industry, magnetic lifters are often used to as handing tools for steel plates and mechanical parts. However,traditional electromagnetic lifter have some problems in use, such as heavy self-weight, easy to heat, short service life, and high power consumption. In addition, they also need to be dragged with cables during work, which not only increase the cost of use, but also brings many safety hazards and increases the maintenance workload. The emergence of permanent magnet lifter provides a perfect solution to these problems.

The permanent magnetic lifter, powered by its high-performance neodymium magnets, can operate without external power, which makes it more flexible in operation and no longer limited by the length and position of the cables.

The permanent magnetic lifter also has many advantages such as small size, strong lifting capacity, high safety, etc. Because it does not require electrical energy to produce and maintain a magnetic field, it does not generate excessive heat during use and does not consume a large amount of electrical resources. This not only reduces energy consumption but also benefits environmental protection, meeting the requirements of modern industry for energy conservation and emission reduction.

Working principle of permanent magnetic lifter

Magnetic Lifter
Working principle of permanent magnetic lifter

The working mechanism of the permanent magnetic lifter is to adjust the direction of its internal magnetic poles by rotating the handle. This change in magnetic pole direction causes the release or shielding of the internal magnetic field, allowing the lifter to switch between operating and closed states.

Magnetic Lifter
Stopped State

When the permanent magnetic lifter is in a stopped state, the magnetic lines of force do not reach its working pole surface, but remain inside to form a closed magnetic circuit. As a result, almost no magnetic lines of force exit from the working pole surface of the permanent magnetic lifter, and therefore, it does not exert an attractive force on an object.

Magnetic Lifter
Working State

When the permanent magnet lifter is required to be in working condition, rotating the handle by 180°changes the direction of the magnetic poles of the entire magnetic core, causing the magnetic field lines to emerge from the N pole of the magnet, pass through the soft magnetic material, and then pass through the iron plate or other iron workpieces, eventually returning to the S pole of the magnet, forming a complete magnetic closed loop. In this way, the workpiece can be firmly adsorbed on the working surface of the permanent magnet lifter.

When the permanent magnetic lifter is in the unloaded state, rotate the handle 180° back to its original position, and the magnetic lines of force form a closed circuit inside the device again. In this state, the lifter almost does not exhibit external magnetism, thus stopping the adsorption of iron plates.

The characteristics of permanent magnetic lifter

1.Safer:

 During operation, electromagnetic lifters may stop working due to sudden power interruptions, which may cause the falling of the load and result in serious safety accidents. Permanent magnetic lifters, which do not require additional power, are ideal for working in places with unstable power supply.

To ensure safety in the event of accidental overload, the pull-out force of the permanent magnet lifter is designed to be 2 to 4 times the rated lifting capacity, providing additional safety guarantees.

It can generally lift several tons of goods. Depending on their specifications and design, some permanent magnetic lifters can even handle cargo weighing up to 10 tons with ease.

Furthermore, to prevent the handle from rotating to the unloading position and causing the workpiece to fall during the operation of the permanent magnetic lifter, the handle is secured by a safety latch after it is moved to the working position, effectively reducing the risk of accidents.

2. More energy-efficient:

The permanent magnetic lifter uses permanent magnets to generate a persistent magnetic field, eliminating the need for continuous power supply. In contrast, electromagnetic cranes require continuous electrification to generate and maintain a magnetic field, thereby consuming more electrical energy. The permanent magnetic lifter has a simpler structure and lower self-weight, resulting in lower power consumption during lifting operations.

3. Easy to maintain:

Compared to electromagnetic cranes, permanent magnetic lifters do not require regular maintenance work such as replacing electromagnets or adjusting the gaps between electromagnets, which further reduces the workload and cost of maintenance.

4. High equipment cost:

Compared with traditional electromagnetic cranes, the equipment cost of permanent magnetic lifters is higher mainly because of the high price of neodymium magnets, which are rare earth materials.

5. Highly affected by temperature:

The magnetic properties of neodymium magnets decrease with increasing temperature, and they can generally only operate below 240°C. If they work for a long time under high-temperature conditions, it may affect the performance and stability of the permanent magnetic lifter.

6. Difficulty in adjusting the magnetic field:

The magnetic field of a permanent magnetic lifter is typically a constant magnetic field, which is difficult to adjust the magnetic field strength by controlling the current, as is done with electromagnetic lifters.  Therefore, it may not be flexible enough for some applications that require frequent magnetic field adjustments.

Summary

In the industrial field, improving efficiency and safety has always been the goal pursued by enterprises. The efficient and safe performance of permanent magnetic lifters not only enhances production efficiency but also saves a lot of costs for enterprises, and creates a safer working environment for workers. It can be predicted that, with the continuous improvement and promotion of permanent magnetic lifter technology, it will play an increasingly important role in industrial production, helping enterprises achieve more sustainable development.

Contact us: Contact | HQ Magnet (hq-magnet.com)

Learn more:Innovating and Applying Neodymium Magnets in Magnetic Lifter Technology (youtube.com)