Neodymium Magnets
Why Choose Us
Acro-Mag systems limited is a professional organization in manufacturing, sales and marketing Flexible Magnet and Magnet related products. Since established, we are improving our product range continuously, Our product line includes Flexible Magnetic Materials, Magnetic Printing and Display Materials, and Magnetic Finished products. We specialize in producing Flexible Neodymium Materials, Fridge Magnet, Chalk Board Materials, White Board Materials, Magnetic Receptive Materials, Flexible Magnetic Strips, and other Rubber Magnet.
Wide Range of Applications
Our products are widely used in Promotion, Advertising, Gifts and Souvenirs, Commercial Visual Display, Interior Display and Decoration, Office and Stationary, Hobby and Crafts, Children's Education etc.
Quality Guaranteed
Our company has obtained a series of certifications such as BA Free testing for Rubber magnetic strips _EN, EC23002507101(GZP23-000976)-CAN Final-ACROMAG, Rubber magnet with EN-71 TESTING_EN, etc.
One-Stop Solution
We supply not only flexible magnet product, but also provide product solutions based on your application and requirement.
Quick Response
Our commitment is to respond to your inquiries within 24 hours, ensuring that you receive the information and support you require in a timely manner.
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![Sintered Neodymium Magnets]()
Sintered Neodymium MagnetsSintered magnet: it is a kind of high-performance rare earth permanent magnet material with neodymium (nd), iron (FE) and boron (b) as the main components. It is easy to demagnetize at high...read more -
![Retangular Neodymium Bottoms]()
Retangular Neodymium BottomsNdFeB Magnet has the characteristics of high remanence, high coercive force, and high energy. Moreover, it is easily formed into variou sizes and shapes, which are ring, rectangular, segment, or...read more
A neodymium magnet is a permanent magnet made from an alloy of neodymium, iron, and boron to form the Nd₂Fe₁₄B tetragonal crystalline structure. They are the most widely used type of rare-earth magnet. If you want to know the specifications and prices of Neodymium Magnets, please contact us!
Strongest Magnet
Neodymium magnets are the strongest permanent magnets available commercially. They have a high magnetic field strength and can generate a powerful magnetic force, even in small sizes. This makes them ideal for applications that require strong magnetic fields.
Compact Size
Neodymium magnets have a high energy density, meaning they can store a large amount of magnetic energy in a small volume. This compact size allows for space-saving designs in various applications where size and weight are critical factors.
Versatility
Neodymium magnets can be manufactured in different shapes and sizes, including blocks, discs, rings, and more. Their versatility in terms of form and magnetization direction enables them to be used in a wide range of applications.
Wide Temperature Range
Neodymium magnets can withstand high operating temperatures compared to other types of magnets. They exhibit excellent magnetic properties even at elevated temperatures, making them suitable for applications that involve high heat environments.
Magnetic stability
Neodymium magnets have excellent magnetic stability, which means they retain their magnetic properties over time. They have a high resistance to demagnetization, ensuring long-term performance and reliability.
Wide Range of Applications
Neodymium magnets find extensive use in various industries and technologies. Some common applications include electric motors, generators, magnetic separators, magnetic resonance imaging (MRI) machines, audio equipment, magnetic jewelry clasps, magnetic therapy, and many more.
Improved Efficiency
Due to their strong magnetic field, neodymium magnets can enhance the efficiency of electric motors and generators. They provide greater power output, resulting in improved performance, reduced energy consumption, and increased overall efficiency.
Precise Control
Neodymium magnets offer precise control over magnetic fields due to their strong magnetic force. This makes them suitable for applications that require fine-tuning and precise positioning of magnetic fields, such as in scientific experiments, sensors, and actuators.
Type of Neodymium Magnets
Sintered NdFeB Magnets
Among the three types of neodymium magnets, sintered NdFeB magnets enjoy the largest output and are most widely used. They are produced by powder metallurgy and are divided into 7 series of N, M, H, SH, UH, EH and TH according to the different coercivity of the products.
The sintered NdFeB that has been commercially produced has a remanence of up to 1.45T and an intrinsic coercivity of up to 2786kA/m. The operating temperature is between 80° and 200° depending on the coercivity.
Sintered NdFeB is easy to be oxidized and corroded, so surface treatment is required. According to different requirements of the use environment, surface treatment methods such as phosphating, electroplating, electroless plating, electrophoresis, and vapor deposition can be used. Common coatings are zinc, nickel, nickel-copper-nickel, epoxy resin, and so on.
Bonded NdFeB Magnets
Sintered NdFeB is difficult to precisely process into a special shape, and problems such as cracking, damage, and difficulty in assembly occur during the process. In order to solve these problems, people tried to crush the permanent magnets and mix them with adhesives, and then press them into a shape in a magnetic field. Thus, bonded NdFeB was developed. It has the advantages of low cost, high dimensional accuracy, a large degree of freedom of shape, good mechanical strength, light specific gravity, etc., and has been widely used in the market.
There are currently 4 processes for forming bonded NdFeB: calendering, injection molding, extrusion, and compression molding, of which calendering and injection are more mainstream. Bonded NdFeB magnets are generally only 80% of theoretical density due to the addition of a large amount of adhesive, so they are weaker than sintered NdFeB magnets in terms of magnetic properties.
Bonded NdFeB is an isotropic magnet with the same magnetism in all directions, so it is convenient to manufacture multi-pole or even countless monolithic magnets. (Bonded NdFeB can also be made into anisotropic magnets)
Hot-Pressed NdFeB Magnets
Hot-pressed NdFeB can achieve magnetic properties similar to sintered NdFeB without adding heavy rare earth elements and has the advantages of high density, high orientation, good corrosion resistance, and high coercivity. However, its mechanical properties are not good, and due to patent monopoly, the processing cost is relatively high. At present, only a few companies on the market have achieved mass production of hot-pressed NdFeB products.
Due to the limitation of the molding technology, the current hot-pressed NdFeB can only be made into a ring shape, and the application range is limited to a certain extent. It is currently mainly used in the fields of automobile EPS motors. The hot-pressed NdFeB magnet has high magnetic performance, and the maximum radial energy product of the magnetic ring can reach 240～360kJ/m3. The magnetic ring is oriented in the radial direction, and the radial magnetic performance is uniform, which can make the motor run quietly and the torque output is smooth. At the same time, it has high heat resistance, and the use temperature can reach 180℃-200℃.
Application of Neodymium Magnets
Magnetic Resonance Imaging
MRIs are medical imaging devices that interact with your body on the tiniest of levels. The magnets affect the electrons in each atom of your body, then captures an image of the effect. The effect is varied depending on the type of tissue, giving a useful diagnostic image the medical field often relies on.
Magnotherapy
The scientific jury's not out on this one yet, but the number of people who swear by magnetic therapy is staggering. In magnotherapy, patients subject part of their body to a magnetic field by wearing magnetic jewelry or using other items on a regular basis, leading to (they say) pain relief, increased blood flow, or one of many other claims.
Audio Equipment
Speakers are controlled by two magnets and an electric current. A mobile electromagnetic coil is suspended near a fixed magnet, and an electric current is pushed through the coil very quickly. As the coil is charged, it is attracted to the magnet and repelled again, causing vibrations that are amplified and become music to your ears.
Lifting Large Loads
Magnets are used in many fields to lift things, from collecting dropped metal pieces, to moving cars, to recovering sunken metal vehicles from underwater. Their lack of moving parts and extreme lifting capacity makes magnets a practical choice. The only hitch -it only works on ferromagnetic items.
Flying
OK, levitation. But the use of magnets to make objects levitate is just as cool. This technology is currently being experimented with for applications from hoverboards to efficient vehicles, as well and moving industrial parts. And you can easily find plans for hovering toys that use small magnets online.
Business Displays and Signage
More and more businesses are relying on magnets to hold their signs in place and attract customers. In store displays often require less preparation of surfaces -and in many building (such as offices) with metal walls or dividers, no preparation. Magnets are also used as a solution for company vehicles, causing no damage to paint and requiring only peeling off.
Do-It-Yourself Projects
Both large and (particularly) small magnets can be found all around the modern home, and DIYers are embracing their usefulness. Used often in cabinetry and sliding parts, they can also be used a less permanent way to ensure a part says put, until you want it to move.
Home and Wall Decor
Do you love to redecorate on a whim but hate the work of patching and re-drilling every time you want to change your wall art? Magnets of impressively small sizes can by used to hold heavy decorative items, making them easy to switch or replace when you want a change.
Stationery and Business Supplies
Who doesn't look harder at a business card or flyer with a nifty design? The same holds true for other printed items. Discreet closures for books and planners, securing a lid, or helping someone keep track of your menu on their fridge are just some of the ways the tiniest of magnets can help.
Jewelry
Magnets are everywhere in jewelry. The most convenient clasps are made from magnets and piercing free earrings depend on them. Recently, many interesting chains that use magnets to morph from bracelet to necklace quickly have been flooding stores.
Hobbies
Magnets are just handy, and nowhere is that more apparent than in crafts and hobbies. Standing up your figurines or making the parts to a project movable require only the tiniest of magnets..
Hard Disk Drives
A hard disk drive records data by magnetising and demagnetising a thin film of ferromagnetic material on a disk. Each disk is separated into many tracks and sectors and each sector has many tiny individual magnetic cells which are magnetised by the drives read/write head when data is written to the drive. Hard drive heads are made from ferrite wrapped in a fine wire coil. When writing, the coil is energised, a strong magnetic field forms, and the recording surface adjacent to the gap is magnetised. Strong magnets are also used in the actuator that moves the read/write head into position.
Magnetically Coupled Pumps
Magnetically coupled pumps consist of a motor-driven shaft with an attached ring of powerful magnets and another smaller ring of magnets attached to another shaft connected to the impeller that sits within the larger ring of magnets. As the motor turns the drive shaft and one set of magnets, the magnetic field generated turns the other set of magnets which powers the impeller. With this type of motor there is no mechanical contact between the motor and the impeller.
Bearings
Magnetic bearings use the concept of magnetic levitation to support moving parts without physical contact. They are used to enable relative motion with very low friction and no mechanical wear even at incredible speeds. Bearings known as passive magnetic bearings use permanent magnets such as neodymium magnet while active magnetic bearings use electromagnets.
Abs (Anti-Lock Braking) System Sensors
Passive ABS sensors use neodymium magnets wrapped inside copper coils. A sensor is placed close to the ABS reluctor ring and as the ring rotates a voltage is induced in the copper wire. This signal is monitored by the vehicle's computer system and used to define wheel speed.
Levitation Devices
Commercially, electromagnets are used for levitation applications such as magnetic levitation transport. However, the availability and affordability of small, strong neodymium magnets means that you can do your own magnetic levitation experiments at home. The trick known as diamagnetic levitation also requires a diamagnetic material such as pyrolytic graphite.
Magnetic Separators
Most processing facilities will use some form of magnetic separation system to remove contaminating ferrous and paramagnetic items from production or processing lines. This is usually done using a form of conveyor system and strong filter rod magnets.
Hanging Artwork
Using magnets to hang artwork is an extremely popular solution both for professional galleries and exhibitions and homemakers. Small neodymium magnets are capable of supporting a substantial weight, even in a shear position and means that even large pieces of artwork can be swiftly swapped and changed.
How to Choose Neodymium Magnets
Magnetic Strength
The magnetic strength of a neodymium magnet is measured in mega Gauss Oersteds (MGOe). The higher the MGOe rating, the stronger the magnet. Neodymium magnets are available in a range of grades, with each grade representing a different level of magnetic strength. The most common grades are N35, N40, N45, N50, and N52, with N52 being the strongest.
When choosing the magnetic strength of a neodymium magnet, it is important to consider the intended use of the magnet and the forces that it will need to withstand. Here are a few tips for choosing the appropriate magnetic strength:
Consider the weight of the object the magnet will be supporting: A magnet with a higher MGOe rating will be able to support a heavier object.
Consider the distance between the magnet and the object: A magnet with a higher MGOe rating will be able to support an object from a greater distance.
Consider the size of the magnet: A larger magnet will generally have a stronger magnetic field than a smaller magnet, even if they have the same MGOe rating.
Consider the cost: Neodymium magnets with a higher MGOe rating tend to be more expensive than those with a lower rating.
Size and Shape
Neodymium magnets come in a variety of sizes and shapes, including discs, cylinders, blocks, and spheres. The size and shape of a neodymium magnet can be customized to meet the specific needs of an application.
Discs: Disc-shaped magnets are thin and flat, with a circular cross-section. They are commonly used in motors, generators, and other applications where a compact, flat magnet is required.
Cylinders: Cylindrical magnets are long and thin, with a circular cross-section. They are commonly used in motors, generators, and other applications where a compact, long magnet is required.
Blocks: Block-shaped magnets are rectangular and have a uniform thickness. They are commonly used in a variety of applications, including motors, generators, and permanent magnets in devices such as MRI machines.
Spheres: Spherical magnets are round and have a uniform diameter. They are commonly used in sensors and as decorative magnets.
Arc: The arc-shaped magnet is bent, with a small fan-shaped section. They are commonly used in motors, generators, and other applications where curved magnets are required.
Ring: The ring magnet is a ring. They are are commonly used in sensors, motors, generators and other applications where ring magnets are required.
It is important to note that the size and shape of a neodymium magnet can affect its magnetic properties. For example, a long, thin magnet may have a stronger magnetic field at its poles than a shorter, thicker magnet with the same MGOe rating.
Temperature Tolerance
The temperature tolerance of a neodymium magnet refers to the highest temperature at which the magnet can be used without losing its magnetism. Neodymium magnets are sensitive to temperature and can lose their magnetism if they are exposed to high temperatures. The temperature at which a neodymium magnet will lose its magnetism is known as the Curie temperature.
The Curie temperature of a neodymium magnet varies depending on the specific alloy used to make the magnet. Some common alloys used in neodymium magnets have Curie temperatures ranging from around 200°C to 330°C.
It is important to choose a neodymium magnet with a high-temperature tolerance if it will be used in a high-temperature environment. This can help to ensure that the magnet retains its strength and performance over time.
Coating
Neodymium magnets are prone to corrosion, so they are often coated to protect them from the elements. The most common coatings for neodymium magnets are nickel, zinc, and epoxy.
Nickel coating: Nickel is a soft, shiny metal that is often used to coat neodymium magnets. Nickel-coated magnets are resistant to corrosion and have a high resistance to demagnetization. However, they are not suitable for use in high-temperature environments, as the nickel coating can peel or flake off at temperatures above 150°C.
Zinc coating: Zinc is a soft, white metal that is often used to coat neodymium magnets. Zinc-coated magnets are resistant to corrosion and have a moderate resistance to demagnetization. They are suitable for use in a wide range of temperatures, but they may not be as durable as nickel-coated magnets.
Epoxy coating: Epoxy is a type of plastic that is often used to coat neodymium magnets. Epoxy-coated magnets are resistant to corrosion and have a high resistance to demagnetization. They are also suitable for use in a wide range of temperatures. However, they may not be as durable as nickel- or zinc-coated magnets.
It is important to choose a neodymium magnet with a suitable coating if it will be used in a damp or corrosive environment. This can help to ensure that the magnet retains its strength and performance over time.
Cost of Neodymium Magnet
The cost of a neodymium magnet can vary depending on a variety of factors, including the size, shape, magnetic strength, temperature tolerance, and coating of the magnet. In general, neodymium magnets with higher magnetic strength, a higher temperature tolerance, or a more durable coating will be more expensive than those with lower ratings or less durable coatings. Larger and/or more complexly shaped magnets may also be more expensive than smaller, simpler magnets.
In fact the most important factor is the price trend of raw materials, especially prices PrNd, DyFe and Tb. ZHAOBAO MAGNET have rich experiences since 1999, and know well about price trend of raw materials so to make good production plan (purchase plan) with customers to offer good cost efficient magnets.
In general, neodymium magnets are relatively inexpensive and are widely available at a variety of price points. It is important to choose a magnet that is within budget, while also considering the specific needs of the intended application.
Intended use of Neodymium Magnet
He intended use of a neodymium magnet is an important factor to consider when choosing a magnet. Neodymium magnets are used in a wide variety of applications, including motors, generators, speakers, headphones, and many other devices.
Here are a few examples of how neodymium magnets might be used:
Motors: Neodymium magnets are used in electric motors to generate the magnetic field that drives the motor. The size, shape, and magnetic strength of the magnet will depend on the specific requirements of the motor.
Generators: Neodymium magnets are also used in generators to generate electricity. The size, shape, and magnetic strength of the magnet will depend on the specific requirements of the generator.
Speakers: Neodymium magnets are used in speakers to generate the magnetic field that drives the speaker cone. The size, shape, and magnetic strength of the magnet will depend on the specific requirements of the speaker.
Headphones: Neodymium magnets are used in headphones to generate the magnetic field that drives the speaker's diaphragm. The size, shape, and magnetic strength of the magnet will depend on the specific requirements of the headphones.
Other devices: Neodymium magnets are also used in a wide variety of other devices, including MRI machines, sensors, and many other electronic and mechanical devices. The size, shape, and magnetic strength of the magnet will depend on the specific requirements of the device.
Certifications
Frequently Asked Questions
Q: What are neodymium magnets good for?
Q: Is it safe to touch neodymium magnets?
Q: What kind of magnets are the strongest?
Q: What are 3 things neodymium is used for?
Q: How long will neodymium magnets last?
Q: Are neodymium magnets illegal?
Q: Is neodymium harmful to humans?
Q: Can neodymium magnets damage cell phones?
Q: Are neodymium magnets safe in water?
Q: How can I make my neodymium magnet stronger at home?
Q: Which is stronger N35 or N52 magnet?
Q: Why do neodymium magnets break easily?
Q: Why is neodymium so expensive?
Q: Does stacking neodymium magnets make them stronger?
Q: Why are neodymium magnets banned?
Q: Can a neodymium magnet stop a bullet?
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Sintered Neodymium Magnets, Hard Magnets, Retangular Neodymium Bottoms