Why can oil-cooled electro overband magnets work continuously for long periods of time? In which scenarios are they mainly used?

Hey everyone in the mining, cement, building materials, or port industries, today we're going to talk about a piece of equipment that's indispensable on many production lines, yet often causes headaches—the electromagnetic separator.
Have you ever encountered this situation: the separator on the conveyor belt is always running, but the suction power gradually weakens, and in the summer, the coil temperature becomes alarmingly high, burning out in just a few days. Downtime for replacement is expensive and time-consuming. Or, in outdoor operations, rain and dust cause the equipment to rust and leak electricity quickly, leading to constant problems.
Actually, these problems can be solved with a good oil-cooled electro overband magnet. Today, we'll discuss our RCDE type oil-cooled electro overband magnet (Oil-cooled suspended electromagnet overhead) and see why many long-term customers call it the "King of Durability" and the "Magnetic Separator."

 
Why choose oil cooling? Because it's truly "durable."
Let's start with the core cooling technology. Ordinary dry-type electromagnetic separators rely on air for heat dissipation, which is difficult to achieve. High temperatures accelerate the aging of the coil insulation, making it prone to burning out.
Our oil-cooled electro-overband magnets, however, utilize forced oil circulation cooling technology, a mature and reliable technique borrowed from large transformers. Simply put, the entire coil is immersed in specialized transformer oil, and internal and external circulation cooling pipes allow the oil to circulate, rapidly dissipating heat.
The advantages are obvious:

1. Extremely low temperature rise: The temperature of the oil-cooled suspended electromagnet overhead coil is typically controlled below 50℃, eliminating concerns about overheating and coil burnout in summer.
2. Continuous operation: It can operate 24 hours a day without interruption, eliminating the need to stop the production line for cooling.
3. Long lifespan: The low temperature, combined with the oil's protective effect on the coil, slows insulation aging, making a lifespan of eight to ten years easily achievable.

The strength of the suction depends on its fundamentals.

A magnetic separator, ultimately, depends on its ability to remove iron. Our Oil-cooled suspended electromagnet overhead features a meticulously designed magnetic circuit:

• Computer simulation optimization: The magnetic system is precisely simulated, resulting in deep magnetic penetration and high magnetic field strength. This means that no matter how thick the material layer, even deeply buried iron pieces can be easily removed.
• Superior core material: The Oil-cooled suspended electromagnet overhead uses high-permeability cold-rolled grain-oriented silicon steel sheets, not ordinary iron. This material has extremely high permeability, significantly reducing hysteresis losses and making the magnetic field more stable, resulting in stronger suction.
• Short magnetic circuit, low loss: The magnetic circuit is designed to be short and efficient, with a large magnetic field gradient. Once iron pieces approach, they are firmly attracted, resulting in very high iron removal efficiency.

Excellent sealing, resistant to outdoor use and dust.
Many iron separators are installed in open conveyor belt corridors or extremely dusty locations. Ordinary equipment quickly deteriorates due to dust or water ingress, causing coil dampness and rust on the casing.
Oil-cooled suspended electromagnet overhead features a fully sealed structure. Combined with vacuum impregnation and curing technology for the coil, it is completely enclosed in transformer oil, further protected by a sealed outer casing. This means it is:

• Dustproof: Dust cannot enter, keeping the interior clean.
• Rain and moisture-proof: It operates normally in rainy weather without the risk of short circuits due to moisture.
• Corrosion-resistant: The casing is treated with anti-corrosion coating, making it suitable for use near seas and chemical plants.

Where are oil-cooled electro overband magnets suitable for use?
Applicable to almost any situation requiring the removal of iron from bulk materials, especially suitable for:

• Mining: Iron removal before crushers to protect downstream equipment.
• Cement plants: Iron removal during raw material and clinker conveying.
• Power plants: Iron removal in coal conveying systems to prevent damage to grinding mills.
• Ports: Iron removal on ore and coal conveying lines.

Glass and ceramics: Iron removal from raw materials to ensure product quality. In summary, choosing a magnetic separator ultimately boils down to selecting reliability and iron removal efficiency. Oil-cooled electro-overband magnets, with their low-temperature longevity thanks to oil circulation cooling technology, high-efficiency iron removal due to their strong magnetic design, and environmental adaptability thanks to their fully sealed structure, are indeed a worthwhile option.
If you are troubled by frequent magnetic separator failures or insufficient suction, or if you want to equip your new production line with a one-time solution, please feel free to contact us. We can recommend the most suitable oil-cooled electro-overband magnet model based on your belt width, material thickness, and the size of the iron parts, and even assist with on-site surveys and selection solutions.
After all, the most important factor is that the equipment is reliable and worry-free to use.