Outer rotor structure

Abstract

The invention discloses an outer rotor structure which includes an outer rotor, an inner stator, a shaft, a first end cover, a second end cover and a plurality of bearings, wherein the outer rotor sleeves the outside of the inner stator; the first end cover and the second end cover cover the two ends of the outer rotor respectively; the shaft passes through the first end cover, the inner stator and the second end cover; the second end cover is fixedly connected with the outer rotor, and is provided therein with a plurality of cavities corresponding to the plurality of bearings one to one; theouter walls of the outer rings of the plurality of bearing are in interference fit with the inner walls of the cavities respectively; the outer wall of one end of the shaft is in interference fit withthe inner walls of the inner rings of all the bearings; and the outer wall of the other end of the shaft is in interference fit with the first end cover. Since the bearings are disposed in the secondend cover, the shaft can be in interference fit with the inner stator, thereby ensuring the concentricity of the shaft and the inner stator, simplifying subsequent processing processes, increasing the yoke width of the inner stator, increasing the magnetic field and improving the efficiency of the motor.

Description

technical field [0001] The invention relates to the field of motors, in particular to an outer rotor structure. Background technique [0002] The existing outer rotor structure is that the inner stator is press-fitted on the base, which reduces the yoke of the stator core of the inner stator and cannot greatly utilize the magnetic field of the motor; since the inner stator is press-fitted on the outer diameter of the base, The bearing is installed on the inner diameter of the base, and the shaft is tightly fitted in the bearing. The concentricity between the shaft and the outer diameter of the stator core is poor due to multiple processing and cooperation. In order to better ensure the concentricity, the outer diameter of the stator core often needs to be adjusted Subsequent grinding process to ensure the concentricity problem. [0003] Existing technologies such as the invention patent CN201038880Y outer rotor motor, the invention includes an outer rotor, an inner stator, ...

AI Technical Summary

Problems solved by technology

[0002] The existing outer rotor structure is that the inner stator is press-fitted on the base, which reduces the yoke of the stator core of the inner stator and cannot greatly utilize the magnetic field of the motor; since the inner stator is press-fitted on the outer diameter of the base, The bearing is installed on the inner diameter of the base, and the shaft is tightly fitted in the bearing. The concentricity between the shaft and the outer diameter of the stator core is poor due to multiple processing and cooperation. In order to ensure better concentricity, the outer diameter of the stator core often needs to be adjusted. Subsequent grinding to ensure concentricity

[0003] Existing technologies such as the invention patent CN201038880Y outer rotor motor, the invention includes an outer rotor, an inner stator, the shaft is tightly fitted on the outer rotor, a bearing is installed between the outer rotor and the shaft, and elastic wave washers, Washer, spacer, the elastic wave washer is pressed on the bearing, the washer is installed between the outer rotor and the shaft and connected with the elastic wave washer, and the spacer connected with the washer is pressed on the shaft through the locking bolt; through this structure Design, the inner ring of the shaft and the bearing is a loose fit, and the axial force is applied to the inner ring of the bearing with the lock nut through the washer and the washer, so that the inner ring of the bearing, the shaft and the outer rotor are tightly pressed together to rotate without relative sliding phenomenon, but the bearings of the outer rotor motor are still arranged at both ends of the base, and the inner stator needs to be press-fitted on the base, resulting in a small yoke of the stator core, which cannot greatly utilize the magnetic field of the motor, and in order to ensure concentricity Still need to carry out tedious processing steps

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