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Home / Products / Neodymium Permanent Magnet

Neodymium Permanent Magnet

What is Neodymium Iron Boron Magnet?
A Neodymium magnet (also known as "NdFeB", "Neo" or rare earth magnet) is a permanent magnet composed of neodymium, iron and boron. They are one of the strongest rare earth magnets of all permanent magnets, and are stronger than samarium cobalt (SmCo), alnico, and ferrite. Besides high magnetic strength, they are also comparatively affordable, which makes them ideal for an extensive array of consumer, business, industrial and technological uses.

NdFeB magnets (neodymium magnets) provide maximum performance with the smallest magnet size. The Neodymium permanent magnet is used in almost all industries, such as the automobile, aeronautics, wind power turbine, military, illumination, food production, separation, electric motor and generating industries.

Permanent NdFeB Magnets Uses

NdFeB magnets are available in several different sizes and variations, including disc magnetsneodymium ball magnetsNdFeB blocksneodymium ring magnetsneodymium arc magnets, and countersunk hole magnets.

 

There are also custom neodymium magnets with screwfix, and they can be rubber coated or plastic coated. This offers numerous options to accommodate a wide range of applications, including

Generators

Neodymium magnets are widely used in various types of generators, especially wind power and electric generators, due to their strong magnetic density and durability. These magnets can produce a strong and stable magnetic field, making the generator more efficient and reducing energy loss. In wind power generation, neodymium magnets are used to increase the magnetic field strength, helping the wind rotor to convert kinetic energy into electrical energy more efficiently, thereby improving the power generation efficiency of the entire system.

Headphones

Neodymium magnets are very common in headphone driver units. Because neodymium magnets can produce a strong and stable magnetic field, they can make the headphone unit have better sound quality performance in a small size. Neodymium magnet headphones can improve the clarity, sensitivity and dynamic range of the sound, giving the listener a fuller sound experience. Their magnetic field strength also makes headphones lighter and more compact, so they are widely used in portable headphones and high-fidelity headphones.

Printers

In printers, neodymium magnets are mainly used in the motor part to help drive the ink cartridge movement and print paper delivery. The strong magnetic properties of neodymium magnets allow the printer's motor to respond quickly, thereby improving printing speed and accuracy. At the same time, neodymium magnets can also reduce the size of motors, making printers more compact and suitable for limited home and office space. Neodymium magnets also have significant advantages in high-speed printing and precision positioning.

Sensors

Neodymium magnets are widely used in various sensors, including position sensors, speed sensors, and magnetic field sensors. The strong magnetic properties of neodymium magnets enable sensors to generate strong magnetic field signals in a small volume, improving the sensitivity and accuracy of sensors. In the automotive industry, neodymium magnet sensors are used to detect key data such as speed and position, providing stable support for autonomous driving systems and safety systems. In addition, neodymium magnet sensors are also used in smart phones, robots, industrial automation and other fields.

Fishing

Neodymium magnets are often used as tools in magnetic fishing activities because of their strong magnetic force and durability. Magnetic fishing is an outdoor activity to find metal objects. Neodymium magnets can easily absorb metal objects in water bodies such as rivers and lakes, such as coins, discarded tools, etc. People usually combine neodymium magnets with ropes to salvage lost items from the bottom of the water through the strong suction of the magnets. The corrosion resistance and strong magnetic force of neodymium magnets make them the first choice for magnetic fishing enthusiasts.
 

Advantages of Rare Earth Magnets

Continuous magnetic field without loss of magnetism
Neodymium magnets can maintain a strong magnetic field for a long time and will not weaken over time. Under normal use conditions, the magnetism of neodymium magnets can remain stable for decades. Compared with some other types of magnets that require regular maintenance or may gradually lose their magnetism, this feature of neodymium magnets makes them an ideal choice for a variety of long-term applications, such as motors, generators, and sensors that require a stable magnetic field.

High energy density, making the magnets light and compact
Neodymium magnet materials have high energy density and can provide strong magnetic force in a small volume. Therefore, neodymium magnets are very light and compact, especially suitable for devices that need to save space, such as headphones, speakers, mobile phones and other portable devices. This feature also makes neodymium magnets widely used in aerospace and automation equipment, helping to maintain lightweight design while ensuring strong magnetic force.

Cost-effective solution
Due to the efficient magnetic output and durability of neodymium magnets, it is very competitive in terms of cost and performance. Neodymium magnets are not only more reasonably priced than other rare earth permanent magnet materials, but also provide higher magnetic output per unit volume. This means that manufacturers can reduce costs while maintaining performance, making neodymium magnets a cost-effective option that is popular in consumer electronics, automotive parts and industrial applications.

No maintenance or cooling required
Neodymium magnets are a permanent magnetic material that does not require external energy to maintain the magnetic field, so they do not generate heat during operation, avoiding the need for a cooling system. In addition, since neodymium magnets have no mechanical parts and will not wear out due to use, this also reduces the complexity of equipment maintenance. This feature not only saves the cost of use, but also significantly improves the reliability of the equipment, making it suitable for use in equipment that requires long-term, continuous operation.

Neodymium Magnets vs Other Magnets

Magnetic strength

  • Neodymium magnets: Neodymium magnets have extremely high magnetic energy product (maximum magnetic energy density) and are one of the strongest permanent magnetic materials known to date, usually several times stronger than other magnets. Therefore, they can provide extremely strong magnetic force in a small volume, especially in applications that require high magnetic flux density.
  • Samarium cobalt magnets: Samarium cobalt magnets are slightly less magnetic than neodymium magnets, but can maintain relatively stable magnetism in high temperature environments. Although the magnetic force is not as strong as neodymium magnets, samarium cobalt magnets are still a good choice in some extreme environments.
  • Ferrite magnets: Ferrite magnets have weaker magnetism, about 1/10 of neodymium magnets, but because of their low cost, they are suitable for applications that do not require high magnetic fields.
  • Iron nitride magnets: Iron nitride magnets have stronger magnetism than ferrites, but weaker than neodymium magnets, and are suitable for applications that do not require high magnetic fields.


Temperature resistance

  • Neodymium magnets: Neodymium magnets have relatively low temperature resistance, and usually show a decrease in magnetic properties at around 150°C, but some high-temperature neodymium magnets can withstand up to 180°C. Therefore, in extremely high temperature applications, neodymium magnets do not perform as well as samarium cobalt magnets.
  • Samarium cobalt magnets: Samarium cobalt magnets can still maintain stable magnetism under high temperature conditions, and can work normally at temperatures of 350°C or even higher, so they are widely used in aerospace and industrial high-temperature environments.
  • Ferrite magnets: Ferrite magnets have good temperature resistance and can be used normally in environments around 250°C, but their magnetism is weak.
  • Iron nitride magnets: Iron nitride magnets generally have low temperature resistance, but can maintain stable magnetism in medium temperature environments.


Corrosion resistance

  • Neodymium magnets: Neodymium magnets are susceptible to moisture and acid-base environments, and are easily corroded. Nickel plating, zinc or resin plating are usually required for surface treatment to improve corrosion resistance.
  • Samarium Cobalt Magnets: Samarium Cobalt Magnets have good corrosion resistance and can be used in humid or chemical environments without coating. They are the preferred permanent magnet material in corrosion-resistant environments.
  • Ferrite Magnets: Ferrite magnets are extremely resistant to corrosion and can even work for a long time in water, making them suitable for humid or underwater environments.
  • Iron Nitride Magnets: Iron Nitride Magnets have moderate corrosion resistance. Although they are not as good as samarium cobalt and ferrite, they perform well in drier environments.


Cost

  • Neodymium Magnets: Neodymium magnets are relatively moderately priced and have excellent performance. They are a very cost-effective permanent magnet material. Their cost is lower than that of samarium cobalt magnets, but higher than that of ferrite magnets. They are widely used in electronic consumer products, industrial equipment and other fields.
  • Samarium Cobalt Magnets: Samarium Cobalt Magnets have a high cost, mainly because the rare metals samarium and cobalt are expensive. Their price is about 2-3 times that of neodymium magnets, and they are usually only used in high temperature or harsh environments.
  • Ferrite magnets: Ferrite magnets have the lowest cost and are suitable for applications that do not require high magnetic force and stability, such as small appliances, motors, etc.
  • Iron nitride magnets: The cost of iron nitride magnets is between neodymium magnets and ferrites. They are used in some low-cost applications, but their application range is relatively narrow due to their limited magnetic properties and durability.

Neodymium Magnet Grades

N35 Neodymium Magnet

N35 is a relatively low grade of neodymium magnet, but it is still far superior to ordinary ferrite magnets. It has a good balance between cost performance and magnetic force, and is suitable for some applications that do not require particularly high magnetic force but need to be economical.
N35 neodymium magnets are often used in office stationery, simple adsorption tools, magnetic toys, magnetic photo frames and other fields. These applications do not require particularly strong magnetic field strength, so choosing N35 can effectively reduce costs.

N38 Neodymium Magnet

N38 has a slightly higher magnetic strength than N35 and has a larger magnetic field density, which is suitable for applications with medium requirements for magnetic force. Compared with N35, N38 provides better adsorption effect, but still maintains a reasonable cost.

N38 neodymium magnets are widely used in magnetic tools, electronic products, speakers, sensors and door locks, etc., suitable for home, office and some light industrial uses.

N40 Neodymium Magnet

N40 grade neodymium magnets provide higher magnetic field strength, can be smaller and lighter in size, while providing reliable magnetic output, especially suitable for applications that require magnetic stability.
N40 is often used in high-precision electronic equipment, generators, motors and magnetic fishing. This grade of magnet can provide greater magnetic density, so it is common in industrial, medical and automation equipment.

N52 Neodymium Magnet

N52 is one of the highest grades of neodymium magnets, with extremely high magnetic energy product and strength. Providing the strongest magnetic force in a small volume makes it the preferred material for applications that require high-density magnetic fields.
N52 neodymium magnets are often used in scientific experiments, high-end electronic equipment, MRI equipment, aerospace and other fields with high magnetic requirements. Its strong magnetic field can meet demanding engineering needs, such as providing maximum magnetic output in places with limited space.

Grade of Rare Earth Neodymium Magnets

 

NIB magnets are available in different grades, which correspond to their magnetic field strength, from N35 (the weakest and cheapest) to N52 (the strongest, most expensive and more brittle). Below is a list of the NdFeB permanent magnet grades and their respective magnetic properties.

 

1.Materials: Neodymium-Iron-Boron;

2. Technology: Utilizes new Sintered NdFeB magnet techniques and equipment such as strip casting, HDDR technology;

3. Magnetic properties: High coercive force, the max operation temp is up to 200 degree centigrade or 380 curie temperature;

4. Grades: N35-N52, 30M-50M, 30H-48H, 30SH-45SH, 30UH-40UH and 30EH-38EH;

5. Shapes: Various shapes

6. Size: According to customers' request;

7. Coatings: Ni, Zn, gold, copper, epoxy, chemical, parylene and so on;

8. Applications: Widely used in different applications, such as sensors, motors, rotors, wind turbines/wind generators, loudspeakers, magnetic hooks, magnetic holder, filters automobiles and so on.

 

NdFeB magnet

NdFeB magnet is an alloy magnet made from ND, Fe, B and other trace metal elements. It is a rare earth magnet known so far for the strongest magnetism as well as high performance (8MGOe-55MGOe) and good coercive force. Proven production process, strict quality assurance, complete technical service and remarkable cost performance.

 

Machining and tolerances

Neodymium is easily ground, although coolants must be used in the process to avoid spontaneous combustion of powder. Grinding should be completed before coating or plating is applied to protect the magnets from corrosion. Standard tolerances for neodymium magnets are +/-0.05mm for ground dimensions.

 

Temperature constraints

The temperature coefficient of neodymium has triggered several grades to be developed to meet specific operating requirements. Please refer to our chart of magnetic properties to compare the characteristics of each grade. Before choosing a neodymium magnet be sure to consider your application's maximum operating temperature.

 

Added value services

Our knowledgeable engineering department is always available to assist in determining the best grade and size of neodymium magnet for your application. We also offer coating and plating choices for magnets we custom-machine.

 

Technical Data of Sintered NdFeB Magnet

Grade

Br

Hcb

Hcj

(BH)max 

(Tw)

mT

(kGs)

kA/m

(kOe)

kA/m

(kOe)

kJ/m3

(MGOe)

N35

1170-1220

(11.7-12.2)

≥868

( ≥10.9)

≥955

( ≥12)

263-287

(33-36)

80 ºC

N38

1220-1250

(12.2-12.5)

≥899

( ≥11.3)

≥955

( ≥12)

287-310

(36-39)

80 ºC

N40

1250-1280

(12.5-12.8)

≥907

( ≥11.4)

≥955

( ≥12)

302-326

(38-41)

80 ºC

N42

1280-1320

(12.8-13.2)

≥915

( ≥11.5)

≥955

( ≥12)

318-342

(40-43)

80 ºC

N45

1320-1380

(13.2-13.8)

≥923

( ≥11.6)

≥955

( ≥12)

342-366

(43-46)

80 ºC

N48

1380-1420

(13.8-14.2)

≥923

( ≥11.6)

≥876

( ≥12)

366-390

(46-49)

80 ºC

N50

1400-1450

(14.0-14.5)

≥796

( ≥10.0)

≥876

( ≥11)

382-406

(48-51)

60 ºC

N52

1430-1480

(14.3-14.8)

≥796

( ≥10.0)

≥876

( ≥11)

398-422

(50-53)

60 ºC

30M

1080-1130

(10.8-11.3)

≥796

( ≥10.0)

≥1114

( ≥14)

223-247

(28-31)

100 ºC

33M

1130-1170

(11.3-11.7)

≥836

( ≥10.5)

≥1114

( ≥14)

247-263

(31-33)

100 ºC

35M

1170-1220

(11.7-12.2)

≥868

( ≥10.9)

≥1114

( ≥14)

263-287

(33-36)

100 ºC

38M

1220-1250

(12.2-12.5)

≥899

( ≥11.3)

≥1114

( ≥14)

287-310

(36-39)

100 ºC

40M

1250-1280

(12.5-12.8)

≥923

( ≥11.6)

≥1114

( ≥14)

302-326

(38-41)

100 ºC

42M

1280-1320

(12.8-13.2)

≥955

( ≥12.0)

≥1114

( ≥14)

318-342

(40-43)

100 ºC

45M

1320-1380

(13.2-13.8)

≥995

( ≥12.5)

≥1114

( ≥14)

342-366

(43-46)

100 ºC

48M

1360-1430

(13.6-14.3)

≥1027

( ≥12.9)

≥1114

( ≥14)

366-390

(46-49)

100 ºC

50M

1400-1450

(14.0-14.5)

≥1033

( ≥13.0)

≥1114

( ≥14)

382-406

(48-51)

100 ºC

30H

1080-1130

(10.8-11.3)

≥796

( ≥10.0)

≥1353

( ≥17)

223-247

(28-31)

120 ºC

33H

1130-1170

(11.3-11.7)

≥836

( ≥10.5)

≥1353

( ≥17)

247-271

(31-34)

120 ºC

35H

1170-1220

(11.7-12.2)

≥868

( ≥10.9)

≥1353

( ≥17)

263-287

(33-36)

120 ºC

38H

1220-1250

(12.2-12.5)

≥899

( ≥11.3)

≥1353

( ≥17)

287-310

(36-39)

120 ºC

40H

1250-1280

(12.5-12.8)

≥923

( ≥11.6)

≥1353

( ≥17)

302-326

(38-41)

120 ºC

42H

1280-1320

(12.8-13.2)

≥955

( ≥12.0)

≥1353

( ≥17)

318-342

(40-43)

120 ºC

45H

1300-1360

(13-13.6)

≥963

( ≥12.1)

≥1353

( ≥17)

326-358

(43-46)

120 ºC

48H

1370-1430

(13.7-14.3)

≥995

( ≥12.5)

≥1353

( ≥17)

366-390

(46-49)

120 ºC

30SH

1080-1130

(10.8-11.3)

≥804

( ≥10.1)

≥1592

( ≥20)

223-247

(28-31)

150 ºC

33SH

1130-1170

(11.3-11.7)

≥844

( ≥10.6)

≥1592

( ≥20)

247-271

(31-34)

150 ºC

35SH

1170-1220

(11.7-12.2)

≥876

( ≥11.0)

≥1592

( ≥20)

263-287

(33-36)

150 ºC

38SH

1220-1250

(12.2-12.5)

≥907

( ≥11.4)

≥1592

( ≥20)

287-310

(36-39)

150 ºC

40SH

1240-1280

(12.5-12.8)

≥939

( ≥11.8)

≥1592

( ≥20)

302-326

(38-41)

150 ºC

42SH

1280-1320

(12.8-13.2)

≥987

( ≥12.4)

≥1592

( ≥20)

318-342

(40-43)

150 ºC

45SH

1320-1380

(13.2-13.8)

≥1003

( ≥12.6)

≥1592

( ≥20)

342-366

(43-46)

150 ºC

28UH

1020-1080 

(10.2-10.8)

≥764

( ≥9.6)

≥1990

( ≥25)

207-231

(26-29)

180 ºC

30UH

1080-1130 

(10.8-11.3)

≥812

( ≥10.2)

≥1990

( ≥25)

223-247

(28-31)

180 ºC

33UH

1130-1170

(11.3-11.7)

≥852

( ≥10.7)

≥1990

( ≥25)

247-271

(31-34)

180 ºC

35UH

1180-1220

(11.8-12.2)

≥860

( ≥10.8)

≥1990

( ≥25)

263-287

(33-36)

180 ºC

38UH

1220-1250

(12.2-12.5)

≥876

( ≥11.0)

≥1990

( ≥25)

287-310

(36-39)

180 ºC

40UH

1240-1280

(12.5-12.8)

≥899

( ≥11.3)

≥1990

( ≥25)

302-326

(38-41)

180 ºC

28EH

1040-1090

(10.4-10.9)

≥780

( ≥9.8)

≥2388

( ≥30)

207-231

(26-29)

200 ºC

30EH

1080-1130

(10.8-11.3)

≥812

( ≥10.2)

≥2388

( ≥30)

223-247

(28-31)

200 ºC

33EH

1130-1170

(11.3-11.7)

≥836

( ≥10.5)

≥2388

( ≥30)

247-271

(31-34)

200 ºC

35EH

1170-1220

(11.7-12.2)

≥876

( ≥11.0)

≥2388

( ≥30)

263-287

(33-36)

200 ºC

38EH

1220-1250

(12.2-12.5)

≥899

( ≥11.3)

≥2388

( ≥30)

287-310

(36-39)

200 ºC

28AH

1040-1090

(10.4-10.9)

≥787

( ≥9.9)

≥2624

( ≥33)

207-231

(26-29)

230 ºC

30AH

1080-1130

(10.8-11.3)

≥819

( ≥10.3)

≥2624

( ≥33)

223-247

(28-31)

230 ºC

33AH

1130-1170

(11.3-11.7)

≥843

( ≥10.6)

≥2624

( ≥33)

247-271

(31-34)

230 ºC

 

Ningbo Bestway Magnet Co. Ltd. is a professional and high-tech company which is committed to research, manufacture and develop of Rare Earth Magnet since 2000 located in Ningbo, China.

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