Rotor assembly, motor and electrical equipment

Abstract

The invention provides a rotor assembly, a motor and electrical equipment. The rotor assembly includes: a rotor core, a permanent magnet, a rotor disc and a plastic coating body; one end surface of the permanent magnet is connected with one end surface of the rotor iron core; the rotor disc is connected with the other end face of the rotor iron core; and the plastic coating body coats at least one part of the rotor iron core, at least one part of the permanent magnet and at least one part of the rotor disc, so that the rotor disc, the rotor iron core and the permanent magnet form an integrated structure. The rotor core, the permanent magnet and the rotor disc adopt an integrated plastic-coated design form, so that the structural strength of the rotor assembly is effectively enhanced, the centrifugal force during rotation of the rotor disc can be overcome, the permanent magnets can be prevented from falling off, the axial deformation of the rotor caused by axial magnetic field operation of the rotor is reduced, further, the air gap uniformity and the air gap flux density sine degree of the motor are prevented from being influenced by axial deformation of the rotor assembly, the sine degree of counter electromotive force of the motor is ensured, and the cogging torque and the torque pulsation of the motor are reduced.

Description

technical field [0001] The present invention relates to the technical field of motors, in particular, to a rotor assembly, a motor including the above rotor assembly, and electrical equipment including the above motor. Background technique [0002] In the application of disc motors, the centrifugal force and the axial magnetic attraction between the stator and rotor of the motor make the magnetic steel easy to fall off, which has become a major problem restricting the application of disc motors. At present, manufacturers generally adopt the method of bonding permanent magnets to the surface of the rotor core. However, the disadvantage of this traditional structure is that during the operation of the disc motor, the directly bonded magnetic steel is not firm, and it is easy to fall off in one piece or in part, so that there is a great risk in the operation of the motor. There is also a method of pressing the permanent magnet with a whole pressure plate, but the disadvantage ...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this traditional structure is that during the operation of the disc motor, the directly bonded magnetic steel is not firm, and it is easy to fall off in one piece or in part, which makes the motor operation very risky.

There is also a method of pressing the permanent magnet with a whole pressure plate, but the disadvantage of this structure is that the eddy current loss in the pressure plate is large, and because of the thickness of the pressure plate, the air gap of the motor is increased, which affects the air gap flux density of the motor and the permanent magnet. Utilization of

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