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  • Magnetic Rotor
  • Magnetic Rotor
  • Magnetic Rotor
  • Magnetic Rotor
  • Magnetic Rotor
  • Magnetic Rotor

Magnetic Rotor

We are proud to present our magnetic rotor assemblies, meticulously assembled from magnets and steel shafts to create rotor assemblies, or magnets with steel casings to form stator assemblies. These assemblies are then integrated with other parts to build motors that deliver high-speed, stable motion and generate the required torque output.

 

Our rotor assemblies use high-performance permanent magnets, such as neodymium (NdFeB) and samarium-cobalt (SmCo), combined with high-strength metal parts. This integration yields a compact structure, reliable performance, and efficient, stable operation, meeting the diverse needs of various applications. They are widely used in fields such as DC motors, micro motors, high-speed motors, and generators. Our rotor assemblies are a reliable choice for industrial manufacturing processes and everyday applications.

 

Rotor assemblies are primarily custom designed to keep pace with market demands, evolving rapidly towards more compact sizes, lighter weights, and either higher torque or speed capabilities. We can provide a full range of customized services for rotor assemblies products according to customer requirements, from consultation and design to prototyping and mass production.


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Stator Assembly

The stator assembly consists of a casing and magnets, where the magnets are either bonded or mechanically attached to the casing.

Casing

The stator casing serves two primary functions: first, as a secure anchor for magnets, and second, as a magnetic flux path between poles. Usually made of low carbon steel, casings come in a variety of forms. They can be machined from steel tubing, rolled from sheet metal, or formed by drawing sheet metal.

Magnets

The magnetic performance of magnets is a critical factor that directly affects the torque and speed of the motor. Common types of stator magnets include anisotropic rubber magnets, sintered ferrite, sintered neodymium (NdFeB), sintered SmCo, and bonded NdFeB. These come in shapes such as strips (wound inside the casing), tiles, or rings.

Rotor Assembly

The rotor assembly is composed of shafts, magnets, balance blocks, and protective sleeves. The magnets are attached or mechanically secured to the shaft, with balancing blocks and protective sleeves added as needed.

Shaft

The shaft is a pivotal part of the rotor, supporting its operation, outputting torque, and connecting the load. It must have sufficient strength and rigidity to prevent vibrations or warping that could compromise stable and normal operation.

Materials for the shaft typically include alloy steels such as 40Cr and 40CrNiMo. Depending on specific requirements, additional heat treatments such as tempering, quenching, or nitriding may be applied to enhance its strength. The shaft design can vary between a smooth cylindrical form or a stepped profile, with grooves or knurls on the surface to facilitate the attachment of other components.

Balance Blocks

Due to inherent inconsistencies in the material or shape of magnets, imbalances can occur in the rotor during operation. This can lead to vibration and noise in the motor. Therefore, for rotors that operate at higher speeds or are larger in size, dynamic balancing must be performed after assembly to minimize imbalance. There are two main methods of dynamic balancing: adding weight or removing weight.

For small, high-speed rotors, balancing is typically achieved by removing a small amount of material from the copper balance blocks. In the case of micro high-speed rotors, dynamic balance is controlled by precision machining of cylindrical magnetic steel to reduce runout on its circumference.

Magnets

Magnets for rotor come in varieties such as sintered ferrite, sintered neodymium (NdFeB), sintered SmCo, and bonded NdFeB. The shapes of these magnets include magnetic arcs, radially magnetized rings, and radiation-patterned rings.

Protective Sleeves

For high-speed motor rotors, it is common to use non-woven tapes to bind the assembled magnets, or to employ protective sleeves made of stainless steel or carbon fiber for reinforcement.

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