Motor stator and external rotor motor with motor stator

Abstract

The invention is appropriate for the technical field of motors, and discloses a motor stator and an external rotor motor with the motor stator. The motor stator comprises a stator assembly which comprises a stator iron core with a through hole and a winding winded on the stator iron core. The motor stator further comprises a plastic package body wrapping the stator assembly and a bearing sleeve which is positioned in the through hole and used for mounting of a bearing. The plastic package body comprises a body plastic package part which covers the stator iron core and the winding. The plastic package body limits the bearing sleeve by means of arranging a limiting part integrated with the body plastic package part. The external rotor motor comprises the motor stator arranged in the rotor. The motor stator and the external rotor motor with the motor stator provided by the invention are convenient to assemble, less in production vibration and noise and high in reliability.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a motor stator and an outer rotor motor with the motor stator. Background technique [0002] The current external rotor motor includes a casing, a rotor and a motor stator arranged in the casing. The stator of the motor has a through hole. In the prior art, the end cover with the bearing chamber and the shaft sleeve with the bearing chamber are respectively pressed into the through hole from both sides, which is inconvenient to assemble, and the coaxiality of the bearing in the motor is poor, and the motor runs It will produce greater vibration and noise, and the reliability is poor. [0003] For example, the document CN201937346U published by the Chinese Patent Office discloses a "Separate Integral Outer Rotor Asynchronous Motor", in which two ball bearings are arranged in a bushing with a shoulder, wherein the shoulder is located at the fixed end of the output shaft...

AI Technical Summary

Problems solved by technology

In this structural mode, the bearing sleeve is resisted by the end covers on both sides, so that the end covers are connected to the stator by bolts, which undoubtedly increases the processing requirements of the stator, increases the cost of the stator, and is inconvenient to assemble; and when the motor is running, the shaft The vibration will be transmitted to the side of the stator through the bushing, which will adversely affect the stator

During assembly, since the shaft sleeve and the end cover are connected by screws, the assembly error between the shaft sleeve and the end cover will still cause a gap between the screw and the shaft sleeve. When the motor is running, the screw must bear the motor force transmitted by the casing The overall weight and the vibration of the motor transmitted by the shaft sleeve will easily cause the screws to loosen, which will affect the operation of the ball bearing and even the output shaft of the motor. At the same time, during the operation, the operation of the two rolling bearings will still produce certain vibrations. Especially in the inner cavity of the stator center hole, the large echo will also generate noise, which affects the increasingly required quiet performance of the entire motor, and poor reliability

[0004] Another example is the document CN101615817B published by the Chinese Patent Office, which discloses an outer rotor motor, which forms a shaft hole in the center of the insulating shell, and forms a bearing chamber at both ends of the shaft hole, and places the bearing in the bearing chamber to reduce the process. However, the outer rotor motor in CN101615817B directly opens the bearing chamber in the insulating casing, which has the following disadvantages: the insulating casing is generally made of a plastic material with good fluidity, and its hardness and strength are all relatively poor. Under long-term use, the bearing chamber will produce Deformation, wear, fracture, etc., resulting in large vibration, high noise, and poor reliability of the motor

[0005] In summary, the external rotor motors in the prior art have the problems of inconvenient assembly and poor reliability

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