Pot magnets, or neodymium deep pot magnets, are the magnets contained with non magnetic or non metallic casing or housing, therefore that concludes the cup magnet, hook magnet, pot magnet, fishing magnet, mounting magnet, clamping magnet, pushpin or thumbtack magnet, bolt counterbores magnet, rubber magnet, thread magnet, epoxy magnet, other coated magnet and custom-made magnets, etc.
That protects from corrosion, impact damage and magnetism reduction quite helpfully. That concentrates the magnetism in one direction without regularly discussing further detail together. That provides to the extreme versatility for wide range of applications in industrial, commercial and personal area.
Pot magnets are working for heavy duty objects in requirement of high pulling force, such as 100 lbs(45 kg) and more. They have more advantages and functions over traditional magnets, maybe more than you can expect.
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Neodymium magnet (NdFeB), also known as rare-earth magnet, is the strongest type of permanent magnet available today. Made from a combination of neodymium, iron, and boron. It is not until the late 19th century, neodymium was successfully isolated by Carl Auer von Welsbach and then wildly used in modern technology since 1980s.
Primary Elements
Neodymium (Nd): A rare-earth metal that provides high magnetic strength.
Iron (Fe): Enhances magnetization and structural stability.
Boron (B): Improves coercivity (resistance to demagnetization).
Additives: Dysprosium (Dy) or praseodymium (Pr) may be added to improve high-temperature performance.
Primary Elements of an NdFeB Alloy
Components of Neodymium Magnet | Percentage by weight |
Neodymium (Nd) | 29% - 32% |
Iron (Fe) | 64.2% – 68.5% |
Boron (B) | 1.0% - 1.2% |
Aluminium (Al) | 0.2% - 0.4% |
Niobium (Nb) | 0.5% -1% |
Dysprosium (Dy) | 0.8% -1.2% |
Neodymium magnet is ideal for applications requiring maximum magnetic strength in minimal space. Their balance of performance, cost, and adaptability makes them the first choice for industries pushing the boundaries of technology. Neodymium magnets are everywhere in our daily life, such as motors, refrigerators, high-end speakers in home appliances; smartphones and laptops of electronics; bookmarks, clasps, pushpins, and buttons in our daily supplies.
Key Advantages
Superior Strength: 5-10 times stronger than ordinary magnets.
Compact Size: Achieve high performance in small dimensions.
Cost-Effective: Better performance-to-price ratio compared to other rare-earth magnets.
Wide Applications: Used in wireless charging, motors, speakers, medical devices, and many others.
Comparison with Other Magnets
Feature | Neodymium (NdFeB) | Ferrite | Alnico | Samarium Cobalt (SmCo) |
---|---|---|---|---|
Magnetic Strength | Extremely High | Low | Medium | High |
Temperature Resistance | Up to 150°C* | Up to 250°C | Up to 550°C | Up to 350°C |
Corrosion Resistance | Requires coating | Excellent | Good | Good |
Cost | Medium | Low | High | Very High |
Common Uses | Wireless charging, EVs, electronics | Refrigerator, speakers | Sensors, guitar pickups | Aerospace, military |
*Special grades can withstand higher temperatures up to 260°C.
For customized solutions (e.g., specific shapes, coatings, or grades), consult manufacturers to optimize magnet design for your application. Always prioritize safety and proper handling to leverage their full potential.
There are three main components playing important roles on magnetic properties: magnetic strength, energy product, and coercivity. They are the most critical factors for selecting the right magnet on a specific application of your own.
Comparison of the Three Properties
Property | Definition | Units | Importance | Example Values |
---|---|---|---|---|
Magnetic Strength (Br) | Residual magnetic flux density | Gauss (G), Tesla (T) | Determines the strength of the magnetic field | NdFeB: 1.0–1.4 T |
Energy Product (BHmax) | Maximum energy density | MGOe, kJ/m³ | Indicates efficiency and compactness | NdFeB: Up to 52 MGOe |
Coercivity (Hc) | Resistance to demagnetization | Oersteds (Oe), A/m | Ensures stability under adverse conditions | SmCo: High coercivity |
(1) Magnetic Strength (Remanence, Br)
Magnetic strength, also known as remanence (Br), is the magnetic induction or magnetization that remains in a ferromagnetic material after an external magnetic field has been applied and then removed. It is measured in gauss (Gs) or tesla (T). In other words, it is the "leftover" magnetization of a magnet when the external field is no longer present. The higher the remanence, the stronger the retained magnetic induction strength of the material, and the greater its potential to be a strong magnetic material.
Units:
Gauss (G) or Tesla (T) in the CGS and SI systems(International System of Units), respectively.
Conversion: 1 Tesla = 10,000 Gauss.
Applications:
High remanence is crucial for applications requiring strong magnetic fields, such as electric motors, speakers, and MRI machines.
(2) Energy Product (BHmax)
The energy product (BHmax) represents the maximum energy density a magnet can store. It is the product of the magnetic induction (B) and the magnetic field strength (H) at any point on the demagnetization curve. The maximum value of this product is called the maximum energy product, denoted as (BHmax). The higher the BHmax, the more energy-efficient the magnet is in a small size, and the better its ability to produce a magnetic field in practical applications. In theory, (BHmax) equals ½ Br² .
Units:
Mega-Gauss-Oersteds (MGOe) in the CGS system or KiloJoules per cubic meter (kJ/m³) in the SI system.
Conversion: 1 MGOe = 7.96 kJ/m³.
Applications:
High-energy product magnets are used in compact devices like headphones, hard drives, and electric vehicle motors.
(3) Coercivity (Hc)
Coercivity (Hc), also known as magnetic coercivity, coercive field, or coercive force, measures a magnet's resistance to demagnetization from an external magnetic field. It is the intensity of the reverse magnetic field required to reduce the material's magnetization to zero. High coercivity ensures the magnet retains its magnetic properties under adverse conditions (e.g., high temperatures or external fields).
Normally there are two types of coercivity:
Intrinsic Coercivity (Hcj): Resistance to demagnetization from internal factors.
Coercive Force (Hcb): Resistance to demagnetization from external fields.
Units:
Oersteds (Oe) in the CGS system or Amperes per meter (A/m) in the SI system.
Conversion: 1 Oe = 79.6 A/m.
Applications:
Magnets with high coercivity are used in environments with strong external fields or elevated temperatures, such as aerospace and military applications.
No. | Grade | Remanence (Br) | Coercivity (HcB) | Intrinsic Coercivity (HcJ) | Energy Product (BHmax) |
---|---|---|---|---|---|
1 | N25 | 1010 (10.1) | 764 (9.6) | 955 (12) | 191 (25) |
2 | N28 | 1050 (10.5) | 764 (9.6) | 955 (12) | 207 (26) |
3 | N30 | 1080 (10.8) | 796 (10) | 955 (12) | 223 (28) |
4 | N33 | 1130 (11.3) | 836 (10.5) | 955 (12) | 247 (31) |
5 | N35 | 1180 (11.8) | 868 (10.9) | 955 (12) | 263 (33) |
6 | N38 | 1230 (12.3) | 899 (11.3) | 955 (12) | 287 (36) |
7 | N40 | 1270 (12.7) | 923 (11.6) | 955 (12) | 303 (38) |
8 | N42 | 1290 (12.9) | 923 (11.6) | 955 (12) | 318 (40) |
9 | N45 | 1330 (13.3) | 876 (11) | 955 (12) | 342 (43) |
10 | N48 | 1360 (13.6) | 836 (10.5) | 955 (12) | 366 (46) |
11 | N50 | 1410 (14.1) | 860 (10.8) | 876 (11) | 374 (47) |
12 | N52 | 1430 (14.3) | 836 (10.8) | 876 (11) | 390 (49) |
13 | 30M | 1080 (10.8) | 796 (10) | 1114 (14) | 223 (28) |
14 | 33M | 1130 (11.3) | 836 (10.5) | 1114 (14) | 247 (31) |
15 | 35M | 1180 (11.8) | 868 (10.9) | 1114 (14) | 263 (33) |
16 | 38M | 1230 (12.3) | 899 (11.3) | 1114 (14) | 287 (36) |
17 | 40M | 1270 (12.7) | 923 (11.6) | 1114 (14) | 303 (38) |
18 | 42M | 1290 (12.9) | 955 (12) | 1114 (14) | 318 (40) |
19 | 45M | 1330 (13.3) | 995 (12.5) | 1114 (14) | 342 (43) |
20 | 48M | 1360 (13.6) | 1027 (12.9) | 1114 (14) | 358 (45) |
21 | 50M | 1410 (14.1) | 1050 (13.2) | 1114 (14) | 374 (47) |
22 | 30H | 1080 (10.8) | 796 (10) | 1353 (17) | 223 (28) |
23 | 33H | 1130 (11.3) | 836 (10.5) | 1353 (17) | 247 (31) |
24 | 35H | 1180 (11.8) | 868 (10.9) | 1353 (17) | 263 (33) |
25 | 38H | 1230 (12.3) | 899 (11.3) | 1353 (17) | 287 (36) |
26 | 40H | 1270 (12.7) | 923 (11.6) | 1353 (17) | 303 (38) |
27 | 42H | 1290 (12.9) | 955 (12) | 1353 (17) | 318 (40) |
28 | 45H | 1330 (13.3) | 995 (12.5) | 1353 (16) | 342 (43) |
29 | 48H | 1360 (13.6) | 1027 (12.9) | 1353 (16) | 358 (45) |
30 | 28SH | 1050 (10.5) | 764 (9.6) | 1592 (20) | 207 (26) |
31 | 30SH | 1080 (10.8) | 804 (10.1) | 1592 (20) | 223 (28) |
32 | 33SH | 1130 (11.3) | 844 (10.6) | 1592 (20) | 247 (31) |
33 | 35SH | 1180 (11.8) | 876 (11) | 1592 (20) | 263 (33) |
34 | 38SH | 1230 (12.3) | 907 (11.4) | 1592 (20) | 287 (36) |
35 | 40SH | 1270 (12.7) | 939 (11.8) | 1592 (20) | 303 (38) |
36 | 42SH | 1290 (12.9) | 955 (12) | 1592 (20) | 318 (40) |
37 | 45SH | 1320 (13.3) | 995 (12.5) | 1592 (20) | 334 (42) |
38 | 28UH | 1050 (10.5) | 764 (9.6) | 1990 (25) | 207 (26) |
39 | 30UH | 1080 (10.8) | 812 (10.2) | 1990 (25) | 223 (28) |
40 | 33UH | 1130 (11.3) | 852 (10.7) | 1990 (25) | 247 (31) |
41 | 35UH | 1180 (11.8) | 860 (10.8) | 1990 (25) | 263 (33) |
42 | 38UH | 1230 (12.3) | 907 (11.4) | 1990 (25) | 287 (36) |
43 | 40UH | 1260 (12.6) | 923 (11.6) | 1990 (25) | 303 (38) |
44 | 42UH | 1290 (12.9) | 923 (11.6) | 1990 (25) | 318 (40) |
45 | 28EH | 1050 (10.5) | 764 (9.6) | 2388 (30) | 207 (26) |
46 | 30EH | 1080 (10.8) | 812 (10.2) | 2388 (30) | 223 (28) |
47 | 33EH | 1130 (11.3) | 812 (10.2) | 2388 (30) | 247 (31) |
48 | 35EH | 1180 (11.8) | 812 (10.2) | 2388 (30) | 263 (33) |
49 | 38EH | 1230 (12.3) | 868 (10.9) | 2388 (30) | 287 (36) |
50 | 30TH | 1080 (10.8) | 812 (10.2) | 2627 (33) | 223 (28) |
51 | 33TH | 1130 (11.3) | 812 (10.2) | 2627 (33) | 247 (31) |
52 | 35TH | 1180 (11.8) | 812 (10.2) | 2627 (33) | 263 (33) |
Neodymium magnet plays a crucial role in wireless charging technology: it helps not only to achieve efficient transfer of power, but also to improve user experience and device compatibility.
Precise Alignment: Ensure the alignment of the transmitting and receiving coils.
Efficiency Enhancement: Optimize the magnetic field distribution to reduce energy losses.
Multi-device Support: Adapt to the charging requirements of different devices.
Stability Enhancement: The magnetic attraction design makes the charging more secure.
Heat Reduction: Minimize energy losses and heat generation.
High-power Support: Ensure the stability of high-power transmission.
Neodymium magnet can be customized onto various dimensions and tolerances because of its high magnetic properties and wide range of applications, there are six common used shapes of neodymium magnets around us:
round shape, square shape, ring shape, arc shape, bar shape, and multi-pole design
Here is all the shapes of magnets that we manufacture a lot for your reference, please contact us if you can't find your own solutions(size tolerance goes from ±0.01mm to ±0.1mm at each side of the magnet):
Features:
Most common shape, easy to manufacture and install. Suitable for scenarios with symmetrical magnetic field distribution.
Applications:
Motors, sensors, speakers, magnetic fixtures, etc.
Features:
Provides a large contact area for scenarios that require an even magnetic field. Easy to stack or combine for use.
Application:
Magnetic separators, magnetic suction cups, industrial equipment, etc.
Features:
Centre hole can be used for mounting or fixing other parts. Magnetic field distribution is concentrated in the peripheral and central areas of the ring.
Applications:
Motor rotors, sensors, magnetic couplings, wireless charging modules, etc.
Features:
Specially designed for round or curved devices to fit curved surfaces. Often used for multi-pole magnetisation (e.g. multiple curved magnets combined to form a ring).
Applications:
Motors, generators, magnetic bearings, medical equipment, etc.
Features:
Suitable for linear magnetic field distribution scenarios. Easy to cut or combine into more complex shapes.
Applications:
Magnetic guides, magnetic separators, magnetic tools, etc.
Features:
Provides complex magnetic field distribution, suitable for high precision applications. Often used in scenarios where precise control is required.
Applications:
Motors, encoders, magnetic sensors, etc.
Features:
Fully customised to meet specific application requirements. Special manufacturing processes may be required.
Applications:
High-end industrial equipment, aerospace, medical devices, etc.
At M-Magnet, we magnetize materials in 6 primary directions for industrial applications. The exact number depends on the magnet's shape and intended use. For standard shapes, axial and diametric are most common, while custom designs allow unlimited orientations - Complex shapes may combine multiple directions for specialized magnetic fields.
axial, diametric, radial, multi-pole, through-thickness, and custom patterns.
Features:
Axial magnetization's magnetic field is applied in the direction of the object's axis, typically using a solenoid or an electromagnet with the magnetic field lines aligned axially Axial-magnetized discs demonstrate 35% stronger holding force than diametric versions in same dimensions.
Key Applications:
Sensor triggers, Encoders, Magnetic couplings, Speakers, Actuators, Motors, Magnetic storage devices, Aerospace, Medical devices, Particle accelerators, Electronics, Craft, Magnetic hook, etc.
Advantages:
Uniform Magnetic Field | It ensures a consistent and uniform magnetic field along the length of the object, which is crucial for many applications. |
Ease of Implementation | It is relatively straightforward to apply an axial magnetic field using standard electromagnetic techniques. |
Compatibility with Existing Designs | Many existing magnetic devices and systems are designed to work with axially magnetized components. |
Features:
A magnetic orientation technique where the magnetic moments within a material are aligned radially from the center towards the periphery or vice versa, which is is highly directional and concentrated along specific radial lines. Their poles point outward or inward along the radius of a circular or cylindrical object.
Key Application:
Magnetic sensors, Encoders, Magnetic Bearings, Medical devices, Permanent magnet motors, Data storage, Magnetic separation, etc
Advantages:
High Precision | Radial fields enable precise control and measurement in sensors and actuators |
Energy Efficiency | Reduces mechanical friction in bearings and motors |
Customizable Patterns | Allows tailored magnetic field distributions for specific applications |
Features:
The alignment of magnetic domains is that the magnetic flux lines radiate outward (or inward) from a central axis, perpendicular to the material's surface. This configuration is distinct from axial or parallel magnetization, where magnetic poles are aligned along a single axis.
Key Applications:
Brushless DC (BLDC) motors & generators, Magnetic couplings, Magnetic gears, Levitation systems, Acoustic devices, Scientific & medical equipment, etc
Advantages:
Uniform Field Distribution | Radial magnetization ensures a highly uniform magnetic field in the radial direction, making it ideal for applications requiring consistent magnetic performance across a specific area. |
Enhanced Magnetic Efficiency | The radial alignment optimizes the magnetic flux path, reducing leakage and improving the overall efficiency of magnetic circuits, which is crucial for energy-sensitive applications. |
Compact Design | Radially magnetized components can be designed to fit into confined spaces, offering a space-saving solution for miniaturized devices without compromising magnetic performance. |
Customizable Field Strength | By adjusting the material properties, dimensions, or magnetization process, the magnetic field strength can be precisely tailored to meet application-specific requirements. |
Reduced Cogging Torque | In motor and generator applications, radial magnetization minimizes cogging torque, leading to smoother operation, reduced noise, and extended equipment lifespan. |
Features:
It devides a magnetic material into multiple alternating magnetic poles (north and south) along its circumference or surface, multi-pole configurations create a series of distinct magnetic regions, each with its own magnetic polarity(e.g., 2-pole, 4-pole, 8-pole, etc). This arrangement can be achieved through advanced magnetization techniques.
Common Configurations:
Halbach arrays
Striped patterns
Checkerboard layouts
Features:
Through-thickness magnetization aligns poles across thin materials' cross-sections. This orientation maximizes surface field strength in limited spaces.
Key Benefits:
25% higher flux density than axial
Ideal for sensor applications
Requires minimum 0.5mm thickness
Features:
Custom magnetization meets unique application requirements through specialized pole arrangements.
Recent Innovations:
Spiral magnetization for reduced eddy currents
Gradient fields for medical devices
3D pole arrangements