Neodymium magnets (NdFeB magnets)
For high-performance applications
with extreme energy density
Neodymium magnets for maximum power in minimum space
Max Baermann is your partner for the development and production of custom neodymium magnets for technically demanding applications. Our magnet solutions based on neodymium-iron-boron (NdFeB) are ideally suited to installation situations that require high magnetic power density while installation space and weight are limited. NdFeB magnets deliver maximum power in minimum space. They offer high coercivity for reliable performance and strong resistance to demagnetization, and they can be efficiently implemented as small, lightweight components. Where a neodymium-free magnet solution and more resilient supply chains are required, SmFeN magnets can be an attractive alternative to neodymium, depending on the application.
Work with Max Baermann to develop a NdFeB magnet – sintered or plastic-bonded – that is precisely designed for the requirements of your application and your production conditions.
High remanence for strong magnetic fields – even in compact and lightweight designs
High coercivity for reliable performance and strong resistance to demagnetization
High cost-efficiency thanks to efficient series production
Technical properties of neodymium-iron-boron magnets (NdFeB magnets)
Neodymium magnets from Max Baermann are based on a metallic alloy of neodymium – a light rare earth element – iron and boron. In sintered NdFeB magnets, heavy rare earths can additionally be used to increase thermal stability and resistance to demagnetization in particular. Plastic-bonded NdFeB magnets, by contrast, can be produced heavy rare earth free depending on the powder grade used – for greater cost control and more resilient supply chains.
Whatever the version, neodymium magnets are convincing thanks to their high magnetic performance. Because they are susceptible to corrosion, however, an additional protective coating is often required.
The lower maximum magnetic performance of plastic-bonded NdFeB magnets compared with sintered magnets can be partly compensated by greater design freedom, complex component geometries and a magnetization pattern individually matched to the function. This makes it possible to create compact, function-integrated magnetic components for rotor, sensor and motor applications.
Different binder materials are used depending on the requirement profile. Engineering polyamides such as PA6, PA11 and PA12 offer a good combination of processability, mechanical stability, dimensional accuracy and cost-efficient series production. For particularly demanding applications, PPS is available as a high-performance binder. PPS-bonded NdFeB magnets are especially suitable for elevated thermal loads and for environments with high requirements for chemical resistance.
| Property | Sintered NdFeB magnets | Plastic-bonded NdFeB magnets |
|---|---|---|
| Field strength | up to 1.5 tesla | up to 0.85 tesla |
| Maximum operating temperature | 80 °C (special grades: 230 °C) | up to 150 °C, depending on the binder |
| Protection | coating often required | generally no coating required (application-specific) |
Technical properties of neodymium-iron-boron magnets (NdFeB magnets)
Neodymium magnets from Max Baermann are based on a metallic alloy of neodymium – a light rare earth element – iron and boron. In sintered NdFeB magnets, heavy rare earths can additionally be used to increase thermal stability and resistance to demagnetization in particular. Plastic-bonded NdFeB magnets, by contrast, can be produced heavy rare earth free depending on the powder grade used – for greater cost control and more resilient supply chains.
Whatever the version, neodymium magnets are convincing thanks to their high magnetic performance. Because they are susceptible to corrosion, however, an additional protective coating is often required.
The lower maximum magnetic performance of plastic-bonded NdFeB magnets compared with sintered magnets can be partly compensated by greater design freedom, complex component geometries and a magnetization pattern individually matched to the function. This makes it possible to create compact, function-integrated magnetic components for rotor, sensor and motor applications.
Different binder materials are used depending on the requirement profile. Engineering polyamides such as PA6, PA11 and PA12 offer a good combination of processability, mechanical stability, dimensional accuracy and cost-efficient series production. For particularly demanding applications, PPS is available as a high-performance binder. PPS-bonded NdFeB magnets are especially suitable for elevated thermal loads and for environments with high requirements for chemical resistance.
| Sintered NdFeB magnets | |
|---|---|
| Field strength | up to 1.5 tesla |
| Maximum operating temperature | 80 °C (special grades: 230 °C) |
| Protection | coating often required |
| Plastic-bonded NdFeB magnets | |
|---|---|
| Field strength | up to 0.85 tesla |
| Maximum operating temperature | up to 150 °C, depending on the binder |
| Protection | generally no coating required (application-specific) |
Variants and fields of application
Max Baermann manufactures the right neodymium-iron-boron magnet solution to match your application-specific requirements – in a plastic-bonded, sintered or hybrid version. In hybrid components, high-performance sintered NdFeB magnets are specifically overmolded with plastic-bonded magnetic material and joined into a function-integrated magnet solution. Hybrid solutions can be achieved both by combining different components and by using specially formulated hybrid compounds. This makes it possible to cover a wide range of magnetic performance, from plastic-bonded ferrite magnets to sintered neodymium magnets.
In this way, the high magnetic performance of the sintered magnet can be combined with the design freedom and individually configurable magnetization of plastic-bonded magnets. The magnetic field and its curve profile can be specifically adapted to the respective motor application. At the same time, eddy current losses can be reduced and additional assembly or bonding processes at the customer’s premises can be avoided. The result is compact rotor solutions that can be manufactured with high process reliability – for example for highly efficient permanent-magnet-assisted synchronous reluctance motors.
Discover the possible versions of neodymium magnets and their applications in rotors and sensors at Max Baermann.
Plastic-bonded NdFeB magnets
In complex applications where, for example, difficult geometries have to be combined with special magnetization requirements, plastic-bonded NdFeB permanent magnets from Max Baermann are the ideal choice. We create plastic-bonded solutions whose technical properties take the later component design and the production processes into account. The result is multifunctional magnets that reduce assembly effort and make additional components unnecessary – a significant technical and commercial benefit for series production.
Good to know: on request, we can develop and manufacture plastic-bonded neodymium magnets without heavy rare earths. This allows you to optimize cost structures and supply chains for critical magnetic components.
Sintered NdFeB magnets
Sintered NdFeB magnets are the first choice when particularly high magnetic force is required in a very small installation space. Max Baermann manufactures NdFeB magnets using the sintering process whenever excellent magnetic performance is needed within limited design space.
The material design always follows the intended operating profile. At high operating temperatures, the alloy can be specifically modified with heavy rare earths. Suitable elements include:
- dysprosium
- terbium
- holmium
- gadolinium
Use as a magnetic component in rotors
In sectors such as general industry, mechanical engineering and the automotive industry, our neodymium magnets are used as precise magnetic rotor components. For this field of application we develop both plastic-bonded and sintered NdFeB magnets that perfectly meet the technical requirements of the respective application.
When you design and manufacture magnetic components for rotors with us, you receive an individual, custom solution that …
- runs exceptionally smoothly,
- is precisely magnetized and
- delivers a homogeneous field distribution.
In addition, our NdFeB rotor components are specifically designed for the thermal, mechanical and media-related loads of the respective application.
Use as a magnetic component in sensors
For sensors that detect angles, positions and rotational speeds, Max Baermann manufactures application-specific magnetic components made from neodymium-iron-boron. Thanks to their high remanence, NdFeB magnets generate strong signals and allow larger air gaps between magnet and sensing element than ferrite magnets.
The high coercivity also protects against magnetic stray fields and supports permanently stable signal acquisition. Innovative design of the polarization structures makes it possible to produce magnets that enable highly precise position detection by the corresponding sensors.
Our sensor magnets offer:
- precise magnetic field curves in a wide variety of profiles
- minimal angular errors
- high field homogeneity
- signals matched to the measuring principle
- reliable signal acquisition across larger air gaps
- high resistance to stray fields
The magnetization is individually matched to the sensor application and can be implemented as axial, diametral, radial or multipole.
More permanent magnets in our portfolio:
Get in touch with the specialists at Max Baermann
If you are looking for powerful neodymium magnets with the right magnetic properties for your application and industry, Max Baermann is the right partner. Together we will find an individual, application-specific magnet solution. As pioneers, experienced developers and reliable manufacturers of permanent magnets, we support you throughout the entire process – from material selection to series production. Talk to us!