Built-in permanent magnet rotor disc and disc type motor

Abstract

The invention discloses a built-in permanent magnet rotor disc and a disc type motor comprising the built-in permanent magnet rotor disc, and relates to the field of permanent magnet motor rotors, the rotor disc comprises an annular rotor iron core, a non-magnetic conductive protective sleeve and a plurality of first permanent magnet groups, the plurality of first permanent magnet groups are uniformly arranged along the circumferential direction of the annular rotor iron core, a gap is formed between any two adjacent first permanent magnet groups, each first permanent magnet group is embedded in the annular rotor iron core, the annular rotor iron core is sleeved on a non-magnetic support of the motor, the non-magnetic protective sleeve is arranged on the outer side wall of the annular rotor iron core, and any two adjacent first permanent magnet groups are opposite in magnetizing direction. The first permanent magnet group, the annular rotor core and a stator disc of the motor can form a first closed magnetic circuit. The rotor disc permanent magnets are embedded, so that the stability of the rotor is good, the built-in structure enhances the magnetism gathering capability of the rotor, improves the salient pole effect of the rotor, improves the reluctance torque, and reduces the permanent magnet consumption of the rotor under the same power level.

Description

technical field [0001] The invention relates to the field of permanent magnet motor rotors, in particular to a built-in permanent magnet rotor disc and a disc motor thereof. Background technique [0002] Axial flux permanent magnet machine (AFPMM) is also called disc permanent magnet motor. The air gap of the axial permanent magnet motor is planar, and the air gap magnetic field is distributed along the axial direction. In recent years, axial motors have attracted more and more attention from researchers at home and abroad due to their advantages such as compact structure, high efficiency, and high power density. The occasions requiring high torque density and compact space have also been more and more widely used. The commonly used axial permanent magnet motor rotor is a surface-mounted structure. The surface-mounted structure is simple in structure, easy to install, small in size and light in weight, but it is difficult to fix the permanent magnet. During the rotation of...

AI Technical Summary

Problems solved by technology

The commonly used axial permanent magnet motor rotor is a surface-mounted structure. The surface-mounted structure is simple in structure, easy to install, small in size and light in weight, but it is difficult to fix the permanent magnet. During the rotation of the rotor, the surface-mounted structure The permanent magnet will be affected by centrifugal force and magnetic pulling force, which will cause the rotor structure to be unstable during long-term work, and the surface-mounted rotor has almost the same inductance of the orthogonal and direct axes, resulting in a small reluctance torque and poor magnetic field weakening capability. When the rated torque is fixed, the reluctance torque is small, and the permanent magnet torque is required to be large, which requires a large amount of permanent magnets

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