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Radially Magnetized Ring Magnet: Unlocking High-Performance & Precision for Motors

Radially magnetized multipole ring magnets offer several advantages for electric motors, including easy installation to the rotor shaft, uniform magnetic flux density, and flexible pole number. These features make them a versatile and reliable choice for various BLDC motor designs, allowing for optimal performance and precision.

Intro: Radially Magnetized Ring Magnet

Radially magnetized ring magnet is a type of neodymium magnet, which offers a manufacturing marvel where magnetic fields can be aligned in various directions, unlike “normal” neodymium ring magnets. Through this manufacturing process, multiple different magnetic fields can be created within a single ring, in diverse directions. This distinctive feature enables the creation of sophisticated magnetic applications in an unconventional manner.

Take, for instance, the classic design of magnetic rotors. Traditionally, arc segment magnets are positioned on a ring, with each segment magnetically aligned in the opposite direction (north or south) to the next magnet. However, with radial sintered rings, a single magnet can host opposite magnetic fields, such as 4, 8, or more circular multi-pole magnets. This capability is exclusive to this technology and cannot be achieved using any other method.

It is crucial to note that harnessing this special technology necessitates specific tooling for each unique magnet, including molds and magnetizing coils and fixture for magnetization. Consequently, it is important to consider the relatively higher costs associated with tooling during the initial stages of development. This technology is not suited for everyone; rather, it caters to electric motor companies seeking distinctive technical solutions or aiming for mass production.

radially magnetized ring magnet
20-pole radial ring magnet

Magnetization Pattern of Radially Magnetized Ring Magnet

Anisotropic magnets, which have a preferred magnetization direction, can also be radially magnetized in special patterns if proper radial orientation is applied during the pressing. This allows for skew magnetization to be achieved on a radial ring magnet, reducing cogging torque in motor applications. Both sintering and hot-pressing techniques can be used to achieve radial orientation.

multipole radial magnetization
multipole radial
radial skew magnetization
skew magnetization
radial magnetization
single pole

As a counterpart, polar-anisotropic ring magnets feature an orientation pattern of Halbach array. This type of multipole ring magnet exhibits higher flux density than radial ring magnet, but is generally more expensive to manufacture.

Advantages of Radially Oriented Ring Magnets

This magnet sets itself apart from traditional Arc magnets in several key ways:

  • Easy Assembly and Elimination of Fall-Off Issues: With the Radially Oriented Ring magnet, assembly becomes simpler and more reliable. The magnet design ensures no fall-off problems, reducing concerns about assembling parts and saving associated costs.
  • Optimized Magnetic Field and Motor Structure: By utilizing Radially Oriented Ring magnets, the magnetic field and motor structure can be optimized to enhance the performance of motors. This leads to improved motor running properties, resulting in more efficient and effective operations.
  • Versatile Magnetization Options: One of the remarkable advantages of Radially Oriented Ring magnets is the ability to be magnetized in various configurations. These magnets can be magnetized as union-pole, multi-pole, or skewed magnets, offering flexibility in meeting diverse application requirements.

With these notable advantages, our Radially Oriented Ring magnets provide superior performance and offer significant advancements over traditional arc magnets.

Anisotropy of Radially Magnetized Ring Magnet

Neodymium magnets can be classified as anisotropic or isotropic. Anisotropic magnets have a preferred magnetization direction, while isotropic magnets can be magnetized flexibly in any direction. Sintered neodymium magnets are typically anisotropic, offering higher flux density, whereas multipole ring magnets made of bonded neodymium magnets are isotropic and commonly used in hall sensor applications.

While the magnetization pattern of anisotropic magnets is predetermined during the pressing process, the pole number is later determined by magnetizing coils.

Applications of Radially Magnetized Ring Magnet

As advancements in artificial intelligence and automation technology continue to progress, the demand for high-precision electromechanical products is growing rapidly. In the case of electric motors, such as BLDC motors in home appliances and servo motors in industrial robots, miniaturization, lightweight design, and high efficiency have become significant industry trends.

As a China-based sintered neodymium magnet manufacturer and radially magnetized ring magnet supplier, we specialize in producing key materials for high-performance motors with compact designs. Radially magnetized neodymium magnets are primarily utilized in high-performance permanent magnet motors and sensors, offering benefits such as high precision, stable operation, and low noise. As radial magnetization technology evolves, both the price and performance of these magnets are expected to further align with market demands, making them an increasingly attractive option for a wide range of applications.

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Jonah Jin

Jonah Jin
Managing Director

Every customer deserves to be treated professionally and responsively.