Rotor having arc cutting structure

Abstract

The invention relates to a rotor having an arc cutting structure. The rotor is used for being arranged in a stator of a motor, and comprises a rotating shaft, a rotor core and a plurality of sector-shaped magnets. The rotor core comprises a plurality of iron core parts and a plurality of magnet accommodating grooves, the iron core parts are mutually connected and integrally formed, and have a first circular arc, and the first circular arc corresponds to a first centre of curvature. The magnet accommodating grooves are sector-shaped, arranged among the iron cores parts, and correspond to a second circular arc, the second circular arc is connected to the first circular arc, and corresponds to a second centre of curvature, and the second centre of curvature is different from the first centre of curvature. The sector-shaped magnets are correspondingly accommodated in the magnet accommodating grooves.

Description

technical field [0001] The invention relates to a rotor with an arc-cutting structure, in particular to a rotor whose iron core has iron core portions corresponding to different circular arcs and magnet accommodating grooves, and the magnets are fan-shaped. Background technique [0002] Generally speaking, whether it is industrial applications, transportation, or household appliances, etc., rotating electrical machines (including motors and generators) are often used as the source of kinetic energy to convert electrical energy into mechanical energy, and then the generated mechanical energy is further processed. application. Motors are divided into permanent magnet brushless motors and wound field excitation motors. Compared with wound field excitation motors, the rotor of permanent magnet brushless motors contains permanent magnets, which can save the use of carbon brushes and slip rings. Therefore, With the advantages of high efficiency, high power density, high durabilit...

AI Technical Summary

Problems solved by technology

However, if the air gap equivalent magnetic flux is reduced due to the reduction of cogging torque, the driving torque will be reduced at the same time, so this method is rarely used; the other is to reduce the change rate of the magnetic circuit equivalent reluctance relative to the rotation angle , which is mainly the cog structure on the armature core to accommodate the winding. When it rotates relative to the pole core, the magnetic flux path changes, resulting in a relative change in the equivalent reluctance of the magnetic circuit, resulting in cogging torque

[0005] However, in the existing methods of suppressing the cogging torque, such as reducing the change of the total equivalent reluctance around the air gap, it is easy to increase the cost and time schedule of manufacturing, assembly and inspection; Although the design of grooves or oblique magnetic poles can suppress vibration and noise, in the process of practical production, it is often difficult to make winding and production. Therefore, the existing rotors that can reduce torque ripple still have room for improvement

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