Rotor structure and motor

Abstract

The invention belongs to the technical field of motors, and discloses a rotor structure and a motor, the rotor structure comprises a rotor core, a permanent magnet, a first short shaft, a second short shaft and a sheath, the rotor core is formed by stacking a plurality of steel silicon wafers, one end of the rotor core is connected with the first short shaft, the other end of the rotor core is connected with the second short shaft, the rotor core is sleeved with the permanent magnet, and the sheath is sleeved with the permanent magnet. And the sheath is sleeved on the permanent magnet. According to the invention, the rotor core is used for replacing a medium-short shaft in the related technology, the rotor core is formed by laminating the high-permeability silicon steel sheets, on one hand, the medium-short shaft has high permeability, on the other hand, the rotor core adopts the silicon steel sheet lamination, and the magnetic resistance between the silicon steel sheets is greatly reduced compared with a solid structure; therefore, eddy-current loss generated by forming a magnetic circuit on the surface of the rotor core is greatly reduced, motor efficiency can be effectively improved, eddy-current loss is reduced, surface temperature rise of the sheath, the permanent magnets and the rotor core is effectively reduced, and suspension precision and stability of the rotor are improved.

Description

technical field [0001] The present invention relates to the technical field of electric motors, in particular to a rotor structure and an electric motor. Background technique [0002] The magnetic levitation motor is to suspend the rotor in the air, so that there is no mechanical contact and mechanical friction between the motor rotor and the motor stator. It is a low-loss, high-performance motor; In addition to the advantages of low power consumption, it also has the advantages of low noise, long life, no lubrication, no sealing, and no oil pollution. Moreover, the rotor speed of the magnetic levitation motor is only limited by the tensile strength of the rotor material, so the circumferential speed of the magnetic levitation motor rotor can be Very high, more and more widely used in high-speed equipment. [0003] The rotor structure of the traditional hidden-pole high-speed motor that focuses on speed is composed of a rotor, a permanent magnet and a sheath. This is becaus...

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Problems solved by technology

[0003] The traditional hidden-pole high-speed motor rotor structure that focuses on speed is composed of rotor, permanent magnet, and sheath. In order to prevent it from being damaged under normal working conditions, the strength of the permanent magnet must be protected by a sheath; the existing high-speed motor rotor adopts a three-stage structure, consisting of a front short shaft, a middle short shaft, and a rear short shaft. It is composed of a short shaft, a permanent magnet and a sheath. Among them, the permanent magnet is set on the middle and short shaft, and the middle and short shaft adopts a solid structure, and the material is magnetically conductive. The solid structure has a large reluctance, and the surface eddy current loss of the middle and short shaft is large. Under long-term operation, the permanent magnet and the sheath will generate a lot of heat and cause the temperature to rise. If the temperature is too high, the magnetic performance will decrease and affect the efficiency of the motor. Poor, abnormal vibration, affecting the stable operation of the rotor

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