Magsafe For Wireless Charger/Power Bank

Magsafe magnet is one of the Magsafe ring to be used on wireless charger or wireless power bank, yet with much simpler design and technology. It is innovative and sustainable, eco-friendly and powerful, While your choose or custom your own Magsafe ring on phone, we will pick up the right Magsafe magnet on your power bank as well if necessary. The only problem - Magsafe magnet is much thicker than a normal Magsafe ring, whether it is a car mount, wallet, or stand type wireless charger.


Unlike Magsafe ring, Magsafe magnet is more like a semi-finished product that needs to be equipped on a charger or power bank with wireless charging function. It is rather an accessories to be seamlessly compatible with wireless charging device and Magsafe ring product. It is simple only after you get the right magnet.


No worry, that’s the detail we concern about, let’s begin right now, shall we?


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The Ultimate Guide of Neodymium Magnets

All you need to know about magnets and manufacturer
  • Chapter 1

    What is neodymium magnet?

    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

    1. Neodymium (Nd): A rare-earth metal that provides high magnetic strength.

    2. Iron (Fe): Enhances magnetization and structural stability.

    3. Boron (B): Improves coercivity (resistance to demagnetization).

    4. Additives: Dysprosium (Dy) or praseodymium (Pr) may be added to improve high-temperature performance.


    Primary Elements of an NdFeB Alloy

    Components of Neodymium MagnetPercentage 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

    1. Superior Strength: 5-10 times stronger than ordinary magnets.

    2. Compact Size: Achieve high performance in small dimensions.

    3. Cost-Effective: Better performance-to-price ratio compared to other rare-earth magnets.

    4. Wide Applications: Used in wireless charging, motors, speakers, medical devices, and many others.


    Comparison with Other Magnets

    FeatureNeodymium (NdFeB)FerriteAlnicoSamarium Cobalt (SmCo)
    Magnetic StrengthExtremely HighLowMediumHigh
    Temperature ResistanceUp to 150°C*Up to 250°CUp to 550°CUp to 350°C
    Corrosion ResistanceRequires coatingExcellentGoodGood
    CostMediumLowHighVery High
    Common UsesWireless charging, EVs, electronicsRefrigerator, speakersSensors, guitar pickupsAerospace, 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.

    Chapter 2

    Magnet properties

    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

    PropertyDefinitionUnitsImportanceExample Values
    Magnetic Strength (Br)Residual magnetic flux densityGauss (G),
    Tesla (T)
    Determines the strength of the magnetic fieldNdFeB: 1.0–1.4 T
    Energy Product (BHmax)Maximum energy densityMGOe, kJ/m³Indicates efficiency and compactnessNdFeB: Up to 52 MGOe
    Coercivity (Hc)Resistance to demagnetizationOersteds (Oe), A/mEnsures stability under adverse conditionsSmCo: 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:

    1. Gauss (G) or Tesla (T) in the CGS and SI systems(International System of Units), respectively.

    2. Conversion: 1 Tesla = 10,000 Gauss.

    Applications:

    1. 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:

    1. Mega-Gauss-Oersteds (MGOe) in the CGS system or KiloJoules per cubic meter (kJ/m³) in the SI system.

    2. Conversion: 1 MGOe = 7.96 kJ/m³.

    Applications:

    1. 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: 

    1. Intrinsic Coercivity (Hcj): Resistance to demagnetization from internal factors.

    2. Coercive Force (Hcb): Resistance to demagnetization from external fields.


    Units:

    1. Oersteds (Oe) in the CGS system or Amperes per meter (A/m) in the SI system.

    2. Conversion: 1 Oe = 79.6 A/m.

    Applications:

    1. Magnets with high coercivity are used in environments with strong external fields or elevated temperatures, such as aerospace and military applications.

    Magnet Properties of Sintered NdFeB at 23℃±3℃
    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)
    (4) Why choose neodymium magnet on MagSafe


    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.



    1. Precise Alignment: Ensure the alignment of the transmitting and receiving coils.


    2. Efficiency Enhancement: Optimize the magnetic field distribution to reduce energy losses.


    3. Multi-device Support: Adapt to the charging requirements of different devices.


    4. Stability Enhancement: The magnetic attraction design makes the charging more secure.


    5. Heat Reduction: Minimize energy losses and heat generation.


    6. High-power Support: Ensure the stability of high-power transmission.

    Chapter 3

    Magnet size & shape

    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:


    1. 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):

    (1) Round Magnets

    Features:

    1. Most common shape, easy to manufacture and install. Suitable for scenarios with symmetrical magnetic field distribution.

    Applications:

    1. Motors, sensors, speakers, magnetic fixtures, etc.

    (2) Square Magnets

    Features:

    1. Provides a large contact area for scenarios that require an even magnetic field. Easy to stack or combine for use.

    Application:

    1. Magnetic separators, magnetic suction cups, industrial equipment, etc.

    (3) Ring Magnets

    Features:

    1. 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:

    1. Motor rotors, sensors, magnetic couplings, wireless charging modules, etc.

    (4) Arc Magnets

    Features:

    1. 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:

    1. Motors, generators, magnetic bearings, medical equipment, etc.

    (5) Bar Magnets

    Features:

    1. Suitable for linear magnetic field distribution scenarios. Easy to cut or combine into more complex shapes.

    Applications:

    1. Magnetic guides, magnetic separators, magnetic tools, etc.

    (6) Multipole Magnetised Magnets

    Features:

    1. Provides complex magnetic field distribution, suitable for high precision applications. Often used in scenarios where precise control is required.

    Applications:

    1. Motors, encoders, magnetic sensors, etc.

    (7) Customized Magnets

    Features:

    1. Fully customised to meet specific application requirements. Special manufacturing processes may be required.

    Applications:

    1. High-end industrial equipment, aerospace, medical devices, etc.

    Find My Magnets
    Chapter 4

    Magnetization direction

    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.


    1. axial, diametric, radial, multi-pole, through-thickness, and custom patterns.


    Axial Magnetization

    Features:

    1. 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:

    1. Sensor triggers, Encoders, Magnetic couplings, Speakers, Actuators, Motors, Magnetic storage devices, Aerospace, Medical devices, Particle accelerators, Electronics, Craft, Magnetic hook, etc.

    Advantages:

    1. 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.


    Diametric Magnetization

    Features:

    1. 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:

    1. Magnetic sensors, Encoders, Magnetic Bearings, Medical devices, Permanent magnet motors, Data storage, Magnetic separation, etc

    Advantages:  

    1. 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


    Radial Magnetization

    Features:

    1. 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:

    1. Brushless DC (BLDC) motors & generators, Magnetic couplings, Magnetic gears, Levitation systems, Acoustic devices, Scientific & medical equipment, etc

    Advantages:

    1. 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.


    Multi-Pole Magnetization

    Features:

    1. It devides a magnetic material into multiple alternating magnetic poles (north & south) along its circumference or surface, it creates a series of distinct magnetic regions, each with its own magnetic polarity(2-pole, 8-pole, etc). This arrangement can be achieved through advanced magnetization techniques.

    Key application:

    1. Automotive Industry, Robotics, Consumer electronics, Scientific research(particle accelerators), Medical devices, Loudspeakers and audio equipment, Magnetic Couplings(pumps, mixers), Magnetic sensors and encoders(automotive speed sensors, magnetic scales), Brushless DC (BLDC) motors, etc

    Advantages:

    1. Enhanced Resolution and Precision The presence of multiple poles allows for finer angular or spatial resolution, making multi-pole magnets ideal for applications requiring precise positioning, such as in encoders, resolvers, and stepper motors.
      Improved Torque Characteristics In motors and actuators, multi-pole magnetization increases the number of torque-producing cycles per revolution, leading to smoother operation, higher torque density, and reduced torque ripple.
      Compact and Lightweight Design By leveraging the magnetic field's spatial distribution, multi-pole magnets can achieve high performance in smaller packages, enabling the development of lighter, more energy-efficient devices.
      Customizable Pole Patterns The ability to tailor the number, width, and strength of magnetic poles allows for optimization of magnetic performance to suit specific application requirements, offering greater design flexibility.
      Reduced Cogging and Vibration In rotating machinery, multi-pole configurations minimize cogging effects and mechanical vibrations, resulting in quieter operation and extended equipment lifespan.
      Enhanced Magnetic Coupling Multi-pole magnets can improve the efficiency of magnetic couplings and clutches by providing more effective magnetic flux paths and stronger attractive/repulsive forces.
    Through-Thickness Magnetization

    Features:

    1. Refers to the process of magnetizing a material uniformly across its entire thickness, ensuring consistent magnetic properties from one surface to the opposite. It is achieved through specialized electromagnetic fields or advanced magnetization processes that penetrate deeply into the material, creating a uniform magnetic domain structure.

    Key applications:

    1. Holding and mounting systems, Magnetic assemblies, Rectangular pot magnets, Magnetic poster hangers, Concrete insert magnets, Actuators and linear motion, Sensors, Magnetic separation, Consumer electronics, Electric motors and generators, Magnetic storage devices, Energy harvesting and conversion, etc

    Advantage:

    1. Enhanced Performance Uniform magnetization across the thickness leads to improved magnetic performance, including higher magnetic induction and reduced magnetic losses. This is particularly beneficial in applications requiring high magnetic efficiency, such as electric motors and transformers.
      Improved Reliability Consistent magnetic properties throughout the material thickness enhance the reliability and longevity of magnetic components, reducing the risk of premature failure due to localized magnetic variations.
      Versatility Suitable for a wide range of materials, including soft magnetic alloys, hard magnetic materials, and certain non-ferromagnetic materials when combined with specific coating or doping techniques.
      Advanced Design Flexibility Enables the creation of complex magnetic structures and patterns, facilitating innovative designs in magnetic devices and systems.
    Custom Patterns

    Features:

    1. Custom magnetization meets unique application requirements through specialized pole arrangements, which is the non-uniform magnetic fields across the surface or volume of a magnet. This allows for highly specific and localized magnetic effects tailored to unique applications.

    Key applications:

    1. High-resolution linear and rotary encoders, Shaped field actuators, Customized magnetic gears and couplings, High-security access cards and keys, Asset tracking, MRI enhancement, Fundamental studies of magnetic materials and interactions, Magnetic fixtures with tailored holding forces, etc

    Advantages:

    1. Enhanced Performance Custom patterns optimize magnetic flux distribution, improving efficiency, sensitivity, or force generation in devices.
      Space and Weight Savings Complex functionalities can be integrated into smaller components, reducing system size and weight.
      Reduced Costs Eliminates the need for multiple standard magnets or mechanical components by consolidating functions into a single magnetized part.
      Design Flexibility Enables innovation in product design by overcoming limitations of standard magnetization types.


    Chapter 5

    Temperature & Corrosion

    Neodymium Iron Boron (NdFeB) magnets, renowned for their exceptional magnetic strength, are the strongest permanent magnets commercially available, but require careful handling of environmental exposure, and coating materials. Advanced grades and protective coatings are essential for maintaining long-term reliability in demanding applications.


    While the best magnet grades and protective coatings are not always the best solutions for your own, users must balance magnetic performance with thermal and environmental constraints to ensure optimal functionality.


    Neodymium magnets' remarkable performance and longevity are significantly influenced by temperature, corrosion resistance, and protective coatings.



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