Can We Really Use Rare Earth Magnets Outdoors

Rare magnets are made of compounds fitting in with the lanthanide gathering of components. Samarium (Sm) and Neodymium (Nd) are two of the most far-reaching Lanthanide components utilized as a part of the handling of rare magnets.

Lanthanide components are ferromagnetic metals. This implies that they the ability to be charged much the same as iron. Be that as it may, their Curie temperatures (the temperature at which they lose their attraction) are generally underneath the ordinary room temperature. This clarifies why rare magnets are not suitable for outside utilization. In most cases, open air temperatures are typically higher than room temperatures. This prompts demagnetization of the magnet and consequent waste. Hence, the utilization of rare earth magnets in the outside environment is not prudent.

neo magnets applications

NdFeB magnets are made up of a compound of neodymium, iron, and boron (Nd2fe14b). They are the most strong and financially savvy sort of rare earth magnets. These magnets have comparative properties to Samarium Cobalt rare earth material aside from, that they are effortlessly oxidized.

This implies that Nd2fe14b magnets have an affinity for erosion. The Fe some piece of their name speaks to iron and iron is a standout amongst the most consumption inclined metals. Then again, this issue is not difficult to manage. Various defensive surface medicine systems, for example, nickel, zinc, gold and tin plating give the essential consumption insurance as and when needed. Epoxy tar covering is an alternate defensive surface medication system that is additionally truly regular.

These surface medication systems guarantee that attractive material does not experience dampness. Notwithstanding, if the covering endures any manifestation of harm, moistness or water may experience the attractive material underneath and reason rusting. NdFeB magnets have one of the most noteworthy vitality items. Subsequently, they are mechanically stronger than Samarium based magnets. Their high-vitality item makes them suitable for creative provisions that oblige a conservative outline and low assembling expenses.

Other helpful aspects of these magnets could be their exorbitant coercive power and normal temperature strength. Much the same as whatever viable material that exists on earth, NdFeB magnets have their own particular detriments. This incorporates low imperviousness to erosion when crudely plated or covered and low mechanical quality.

Rare magnets are connected with tremendous engaging strengths. This characteristic accompanies its own particular novel risks.

Rare earth magnets that have measurements of barely a couple of centimeters have the potential of bringing about genuine real damages. This is particularly thus if a body part gets trapped amidst the two magnets. In a few occasions, these magnets have even brought about broken bones. That is the way influential rare earth magnets might be.

Application of Rare Earth Permanent Magnet in New Energy Automobile

NdFeB magnets are widely used in automobile motor, servo motor wind turbines, robot, and the elevator, air conditioning, speakers, etc.

Rare earth magnet is widely used in the new energy vehicle market, the quality of magnet affected by the model, the design idea and other various aspects of the automobile.

Since the outer ring of permanent magnets, the rotor will, therefore, operate as provided on the outer side of the stator. Typically a rotor of new energy automobile has a generator stator combination use, and this serves as the outer ring of the rotor.

new energy automobile

More than 30 parts of general motors vehicle use rare earth permanent magnet, and there are more than 70 parts of luxury cars need to use rare earth permanent magnet materials, a fully automatic advanced car need about 0.5 kg – 3.5 kg.

NdFeB magnets rare earth permanent magnet material on new energy vehicles, each hybrid electric vehicle (HEV) to use more 5 kg of neodymium magnet than the traditional car; Pure electric vehicles (EV), rare earth permanent magnet motor has replaced the traditional generator.

All the above permanent magnets can be used on magnetic coupling and magnet rotor. But neodymium iron boron is the most widely used magnetic material due to high magnetic energy product (BHmax) and intrinsic coercive force. When under high working temperature (above 200 degrees Celsius), you can use SmCo magnet which can reach 250 to 300 degrees Celsius.


Are Neodymium Magnet Motors More Efficient

Neodymium Magnet is very critical in an electric motor. As the application field expanded, such as permanent magnet motors using on elevator and wind power, the user puts forward higher requirements on the corrosion resistance of NdFeB rare earth magnets.

Meanwhile, compared with coated NdFeB permanent magnets, the uncoated neodymium magnets are much better to work with mating parts at the glue adhesive power; the use safety of motor also increase accordingly.

neodymium magnet motors
Therefore, some customers began to use hast NdFeB permanent rare earth magnet a lot in their products.

The requirement for the motor magnet is very important. There are:

High magnetic performance
Grades such as N52, N50M, N48H, N45SH, N40UH, N38EH and N30AH are available. Our complete production lines help us meet different demands of customers.

High consistency
To ensure the good working performance of the motor, the batch-to-batch consistency and continued stability of permanent magnet are the two of the key indices.

Low Magnetic Field Attenuation
Different batches of our N40SH permanent magnets have a repeated high-temperature thermal reduction magnetic test in 120*4 hours; the flux decay is 0 starting from the fourth test.

High Working Temperature
The max working temperature for our rare earth sintered neodymium magnet can be above 240℃.

Low Weight Lost and High Corrosion Resistance

The iron-based and rich neodymium in NdFeB magnet is equal which leads to very poor magnet corrosion resistance. To avoid oxidation, generally, neodymium magnets need to be electroplated.

Due to very low weightlessness properties, rare earth magnets have good corrosion resistance to promote reliability and service life significantly. Hast neodymium magnet can meet stringent requirement of corrosion resistance for high-end application field like permanent magnet rotor. This applies mainly to Halbach array, elevators, linear coupler, radar, wind turbines and other military aerospace, industrial motors, etc.

How to use Custom Rubber Coated Neodymium Magnets

Rubber’s elasticity, toughness, impermeability, adhesiveness, and electrical resistance make it useful as a coating material. Neodymium magnets wrapped in protective coating rubber feature waterproofing and crushproof, as well as apply to delicate metal surfaces, providing a good level of corrosion protection for outdoor use and leaving no scratch.

With neodymium magnets (NdFeB) inside, rubber coated magnets have extremely strong holding forces.

With rubber coating outside, neodymium magnets have great durability and high friction which can stand steadily on various surfaces, such as glass.
Rubber coated magnet assembly is a magnet system with bore, countersunk, eyebolt and hook that can be used with a range of standard fasteners and attachments.

Rubber Coated Neodymium Magnets
How to use Custom Rubber Coated Neodymium Magnets?

These high strength, soft touch rubber coated magnets and assemblies are designed for different holding/mounting applications, such as furniture fixings, retail fixing, hanging artwork, keeping doors and drawers closed, holding heavy objects: lights, equipment, exhibit fixtures, tools, and other items in warehouses, manufacturing facilities, garages, work stations, etc.
Uncoated neodymium magnets are easily oxidized. To protect our NdFeB magnets from corrosion, we will use different plating.

Nickel-copper-nickel coating is the most common one. But even with electroplated coatings; you’d better use neodymium magnets exclusively in dry indoor areas.

If you want to use magnets in the water or outdoors, NiCuNi+plastic coated is the right choice.

Our plastic coated magnets are custom magnets wrapped with environment-friendly colorful plastic. They are waterproof and crushproof.

Where to use rubber-coated magnet assembly?
In the office (e.g. magnetic whiteboards)
Long-term use outdoors
In wet surroundings (e.g. bathroom)
Underwater (e.g. Use neodymium magnets in the aquarium to hold flag racks, powerheads)

Application of NdFeB in Permanent Magnet Motor Industry

What is a permanent magnet motor?

Permanent magnet motor uses a permanent magnet to generate the magnetic field of the motor without excitation coil or excitation current. It has high efficiency and simple structure. It is a good energy-saving motor. With the advent of high-performance permanent magnet materials and the rapid development of control technology, the application of permanent magnet motor will become more extensive.

Neodymium magnets are widely used in permanent magnet motors.

What are permanent magnet motors?
Common permanent magnet motors are: permanent magnet DC motor, permanent magnet AC motor

Permanent magnet DC motors include: brush DC motor, brushless motor, stepper motor, etc.

Permanent magnet AC motors include: synchronous permanent magnet motor, permanent magnet servo motor, etc.

permanent magnet motors

What are the benefits of rare earth permanent magnet materials?
Because of the excellent magnetic properties of rare earth permanent magnet materials, a strong permanent magnetic field can be established without additional energy after magnetization. The rare earth permanent magnet motor made by replacing the electric field of the traditional magnet rotor is not only efficient, but also simple in structure, reliable in operation, small in size and light in weight. It can not only achieve the high performance (such as super high efficiency, super high speed, super high response speed) that traditional electric excitation motors cannot match, but also make special motors which can meet the specific operational requirements, such as elevator traction motor, automobile special motor, etc.

magnet motor automotive

How is a permanent magnet motor used in the automotive industry?
The automotive industry is the largest user of permanent magnet motors. The motor is the key component of automobiles. In a super luxury car, there are more than 70 motors for various purposes, most of which are low-voltage permanent magnet DC micro-motors. Starter motors for automobiles and motorcycles can be reduced by half by using Nd-Fe-B permanent magnets and decelerating planetary gears.

The combination of rare earth permanent magnet motor (REPM) with power electronics and computer control technology has improved the performance of the motor and transmission system to a new level. Therefore, improving the performance and level of the technical equipment is an important development direction for the motor industry to adjust its industrial structure.

What are the other applications of permanent magnet motors?
Rare earth permanent magnet motors are widely used in aviation, aerospace, national defense, equipment manufacturing, industrial and agricultural production, and daily life. It includes permanent magnet synchronous motor, permanent magnet generator, direct current motor, brushless direct current motor, AC permanent magnet servo motor, permanent magnet linear motor, voice coil motors, special permanent magnet motor and related control system, covering almost the entire motor industry.

Permanent Magnet in IH Rice Cookers

Demand Increase of Permanent Magnet
With the rice cooker, IH technology is bound to use a magnetic material (including neodymium n52, cobalt, nickel, etc.), many domestic and foreign manufacturers in the development and mass production of IH rice cookers, which means rare earth magnet demand will be increasing.

IH Rice Cooker – Super High-End Rice Cooker on The Market Now
IH is an abbreviation for Induction Heating, Induction means electromagnetic induction, and Heating, by definition, which is “electromagnetic heating.”

IH Rice Cookers

Electromagnetic Coil Technology
This product canceled the heating plate of the traditional rice cooker, instead, an electromagnetic coil, mounted on the inner portion and the bottom of the pot between the insulation cover, using electromagnetic induction heating to cook food, so that the inner pot is both a carrier and heat generation.

Compared With The Traditional Rice Cookers
IH rice cooker is not only fast and uniform heating, but also in environmental protection, service life and safety performance also has unique advantages, it will be the future development trend of the rice cooker.

Non-Contact Heating Technology
It works by generating a frequency of 20-40 kHz high-frequency alternating current through the control circuit, the high-frequency current flowing through the solenoid will produce rapid changes in alternating magnetic field,When an alternating magnetic field lines close through the magnetic field near the custom magnet (iron, cobalt, nickel) will drive the material’s microcrystalline structure of the metal, thus producing countless small eddy, and then let the metal material microstructure friction between itself and its own fever, achieve the purpose of non-contact heating of the metal material.

10 Amazing Neodymium Magnets Applications

Magnetic Toy and Education (Be careful & Don’t swallow any magnet)
1. Magnetic Pen
The POLAR Pen is a creation developed by designer Andrew Gardner. It’s more than a pen. By modular design, this magnetic pen can transform into endless possibilities: Pen spinning, compasses, bullets and so on.

2. Magnetic kids fishing game
The fishing game is a classic game for kids which you can buy from any toy shop.

3. Magnetic charger cable
InCharge Bolt, the smallest keyring cable in the world, designed by Lorenzo, Carlo, and Paolo.

4. Magnetic bike light
No longer worry that someone might steal your bike light. Lucetta magnetic bike light, designed by Pizzolorusso, can be attached and taken off in an instant. In addition, it can be placed wherever you want on your bike, and of course, it is super-fun to use.

5. Magnetic container
No extra space in the junk drawers to organize your odds and ends? Let’s create some by a permanent magnet and different containers, such as a water bottle and can.

6. Magnetic cosmetics board
If you have some cosmetics laying around on the table, magnetic cosmetics board can help you out of this mess. It is vertical storage for makeup collections supported by rare earth magnets and iron plate.

7. Magnetic toy rack
It is such a time-consuming task of organizing the kids’ rooms, especially when your kids have many toys and you don’t have enough storage space.

8. Magnetic pin dish
Neodymium cup magnets can be used to store pins, paper clips, and needle.

magnetic pin dish

9. Magnetic therapy
Have you ever heard about magnet therapy? It is a rare earth magnet application of the magnetic field of electromagnetic devices or permanent magnets to the body for purported health benefits. There are many related products in the market: such as magnetic underpants, magnetic bra, magnetic pillow, magnetic mattress pads, magnetic knee wrap, magnetic ankle wrap, magnetic wrist wrap, back, and hip wraps.

Magnetic Storage
We all want our home to be well organized and tidy. Why not use some magnetic tools to help you?

magnetic dutchman joint

10. Magnetic dutchman joint
Dutchman joint (also named dovetail key) is a type of woodwork joint used either to hold two or more wooden boards together or to keep two halves of a board that has already started to split from splitting further. With permanent magnet help, we can design a secret compartment to store power outlets or something else.

How to Use Halbach Array

A Halbach array is a special arrangement of permanent magnets that augments the magnetic field on one side of the array while canceling the field to near zero on the other side. This is achieved by having a spatially rotating pattern of magnetization.

The rotating pattern of permanent magnets (on the front face; on the left, up, right, down) can be continued indefinitely and have the same effect. The effect of this arrangement is roughly similar to many horseshoe magnets placed adjacent to each other, with similar poles touching.Halbach array

1. Materials
Magnet: Neodymium Magnet
Hardware part: 20# steel, martensitic stainless steel

2. Application
Linear Halbach arrays:
Such as the brushless AC motor, voice coils, magnetic drug targeting to high-tech applications such as wiggler magnets which are used in Particle accelerators and Free-electron lasers.
Halbach cylinder:
Such as brushless AC motors, magnetic couplings, and high field cylinders. Both brushless motors and coupling devices use multiple field arrangements.

neodymium magnet halbach

Halbach arrays are widely used in magnet rotors. Rare-earth permanent magnet motor is a new type of permanent magnet rotor, it began in the early 70s. And the rare-earth permanent magnet motor has a series of advantages, such as small size, light weight, high efficiency, and good characteristics. Its applications are very extensive and extend all over fields of aviation, space, defense, equipment manufacturing, industrial and agricultural production, and daily life.

Halbach arrays can be made by neo magnets. Sintered NdFeB magnet is one of the high-performance rare earth magnets, with high remanence, high coercive force, high energy product and high performance/cost ratio, It is easily produced into various sizes.

Sintered NdFeB magnets are widely used in high performance stepper, DC motors, servo motors, and linear motors, actuators, loudspeakers, headphones, electronic instruments, switches, relays, magnetic imaging for medical and geophysical applications, holding systems, magnetic bearings, magnetic couplings, hard disk drives, magnetic separator, magnetic lifter, other magnetic tools and so on.

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What is A Magnet Rotor Made of

Magnetic motor rotor is formed by magnetic steel, metal shaft or metal shell. According to detailed application situation, the rotor magnet can be sintered, molded or injection molded with NdFeB magnet material and Ferrite magnet material with multi-poles magnetic rings. It can be used for the high-speed motor, line motor, stepper motor, etc.

With the increasing performance of permanent magnet materials, rare earth permanent magnet materials are widely used in electrical fields. Using high-performance rare earth permanent magnet materials to make a motor, the structure does not require special electrical excitation system, which helps to improve motor efficiency and power factor, and save energy, reduce the size of the motor.

magnets rotor
Currently, in the design of permanent magnet motor, the general assumption that a uniform distribution of the various parts of the magnetic field of the permanent magnet and the magnetic properties of the same batch of permanent magnets can be the same, while the need to use a permanent magnet demagnetization curve of permanent magnet at room temperature under suppliers, intrinsic connectivity magnetic parameters, residual magnetism, such as density and maximum energy product.

However, since the manufacturing process and the level of the plant and other reasons, there is a temperature in each portion of a permanent magnet hereinafter actual performance differences and the performance of the same group of permanent magnets is different.

The magnetic properties of the permanent magnet

permanent magnet motor in normal operation can be closely related to the magnetic rotor, permanent magnet motor can directly determine whether reliable operation.

When the permanent magnet motor is running, sometimes leaving the rotor temperature higher NdFeB irreversible demagnetization phenomenon, causing permanent magnet synchronous motor efficiency and power factor and other performance indicators deteriorated.

Furthermore, a permanent magnet motor rotor can be customized by different kinds of magnetic materials, and custom drawing is welcomed.

How to Recycle Magnets

The magnet made from rare earth is not a new technology. It was developed by scientists as early as 1982. Its official name is “NdFeB strong magnet”. The method is to extract Nd, Fe, and B from rare earth to form the metal body and then turn on current to magnetize.

The neodymium magnet is the most powerful magnet at present, and the loss of magnetic force is very slow, almost reaching the effect of the permanent magnet. Neodymium magnets are now widely used in computer hard drives, Halbach array, mobile phones, eardrums, speakers, and battery-powered electronic products.

Recycle Magnets

Turning old into new

Permanent magnets recycle means the extracting the rare earth elements from the magnets again. However, it is very hard and expensive.

The scientists of the Fraunhofer Project Group for Materials Recycling and Resource Strategies IWKS in Alzenau and Hanau of the Fraunhofer Institute for Silicate Research ISC are now pursuing a different approach to recycle the entire material instead of trying to regain each individual type of rare earth.

Because the composition of the material is already almost as it should be, this process only needs a few steps, and this is much easier and more efficient.

The first magnet successfully recycled
The scientists rely on the melt spinning process that already tried and tested for other alloys, also known as “rapid solidification”. The details are as below:
The researchers liquefy the magnet in a melting pot. The liquefied material, heated to more than 1000 degrees Celsius, is directed via a nozzle onto a water-cooled copper wheel that rotates at a speed of 10 to 35 meters per second. As soon as the melted droplet comes into contact with the copper, it transfers its heat to the metal within fractions of a second and solidifies.
The scientists call the emerging material formations “flakes”. The special feature is the structure formed inside the flakes. If the melted material were allowed to solidify in the normal way, the atoms would “line up in rows” in a crystal lattice. In the melt spinning procedure, however, crystallization is avoided: Either an amorphous structure is formed, in which the atoms are completely irregularly arranged, or a nanocrystalline structure, in which the atoms arrange themselves in nanometer-sized grains to form a crystalline structure.
The advantage: The grain sizes – meaning the areas with the same crystalline structure – can be specifically varied. They can be used to change the properties of the permanent magnet. In a further step, the researchers mill the flakes into a powder, which can then be further processed. “We press it into its final shape”, Diehl says

If the price of rare earth elements continues to go up, magnet recycling will be more cost-efficient and recycling permanent magnets from wind turbines and electric motors will be popular.

Now they have already set up a demonstration plant and have managed to recycle magnets there. This demo system can process up to half a kilogram of molten material and is somewhere between a lab and a large-scale plant.

In many cases, the rare earth magnets are extremely difficult to remove from the engines. So the potential ways of creating a collection cycle for used engines, and also of a design more suitable for disassembly is what the scientists want to develop.