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Help CenterHigh-Speed Permanent Magnetic Rotor Assemblies With Power-Dense Permanent Magnetic Rotor Materials
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The characteristics of High-Speed Permanent Magnetic Motor Rotor can be summarized as follows:
High speed characteristics:
The rotor design of the high speed permanent magnet motor enables it to achieve very high speed. Typically, high speed motors have rotor speeds higher than 10,000 r/min, and this high speed rotation is critical for many applications such as high speed grinders, centrifugal compressors, etc.
High strength structure:
When rotating at high speed, the rotor will be subjected to huge centrifugal force. In order to ensure the stable operation of the rotor, the rotor of the high-speed permanent magnet motor usually adopts a special high-strength laminated or solid rotor structure.
Interference fit is adopted between the permanent magnet and the sheath, and static pre-pressure is applied to the permanent magnet with the sheath to offset the tensile stress generated by high-speed rotation, so as to ensure that the permanent magnet rotor can still withstand a certain compressive stress when rotating at high speed.
Heat dissipation performance:
When rotating at high speed, the friction loss between the rotor and the air gap is large, which causes the rotor temperature to rise. Therefore, the high-speed permanent magnet motor rotor is usually designed with a good heat dissipation structure to ensure that the rotor can still maintain stable performance at high temperatures.
Slim design:
Compared with the constant speed motor, the rotor of the high speed motor is mostly thin. This design can reduce the bending deformation of the rotor during high-speed rotation and reduce the risk of bending resonance.
Material selection:
The choice of permanent magnet material is very important for the performance of high speed permanent magnet motor. Usually, high-performance permanent magnet materials (such as Ndfeb, etc.) are used to ensure the magnetic properties of the rotor.
Precise design and manufacturing processes:
The design and manufacture of high speed permanent magnet motor rotor requires high precision process and equipment support. For example, the dynamic balance accuracy and surface roughness of the rotor need to be strictly controlled to ensure the stability and reliability of the rotor.
Accurate prediction of critical speed:
The possibility of high speed motor rotor system approaching the critical speed is greatly increased. In order to avoid bending resonance, it is necessary to accurately predict the critical speed of the rotor system and take corresponding measures to avoid it.
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