Low-power external rotor alternate current motor

Abstract

A low-power external rotor alternate current motor uses the split structure of an outer rotor and the connecting end cover of the outer rotor, and the split manufacture of a connecting and installing surface and a fission structure corresponding to the connecting and installing surface; after the process that the outer rotor axis and the connecting end cover of the outer rotor are concentrically die cast and then fixedly installed, accurate and effective secondary machining can be carried out to the connecting and installing surface and the corresponding connecting and installing surface, then, by a clamp, and in a way of screw connection or welding connection, and other suitable connecting ways, the outer rotor and the connecting end cover of the outer rotor are fixedly connected and installed along the axial central direction of the outer rotor axis, thereby forming a group of outer rotor assembly with high concentric degree and very low reject rate; and the outer rotor and the connecting end cover of the outer rotor are suitable for being used in a low-power outer rotor alternate current motor.

Description

technical field [0001] The invention relates to a motor, in particular to a low-power external rotor AC motor. Background technique [0002] In the prior art, there is a low-power external rotor AC motor in which the outer rotor and the outer rotor connecting end cover are integrally die-cast as an inseparable integral part, and then the outer rotor shaft is pressed into the center of the outer rotor connecting end cover in a tight fit. The fixed hole of the outer rotor assembly is formed to form a group of outer rotor assemblies, and then the outer rotor shaft of the outer rotor assembly is inserted into the bearing of the fixed base of the stator, and the outer rotor is placed outside the stator, thus forming a Low-power external rotor AC motor with external rotor, this low-power external rotor AC motor can be directly fixed with related working components (such as wind wheel) through the outer wall of the external rotor, saving the need for conventional AC motors to protr...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, there is a low-power external rotor AC motor in which the outer rotor and the outer rotor connecting end cover are integrally die-cast as an inseparable integral part, and then the outer rotor shaft is pressed into the center of the outer rotor connecting end cover in a tight fit. The fixed hole of the outer rotor assembly is formed to form a group of outer rotor assemblies, and then the outer rotor shaft of the outer rotor assembly is inserted into the bearing of the fixed base of the stator, and the outer rotor is placed outside the stator, thus forming a Low-power external rotor AC motor with external rotor, this low-power external rotor AC motor can be directly fixed with related working components (such as wind wheel) through the outer wall of the external rotor, saving the need for conventional AC motors to protrude from the motor end cover The horizontal space where the rotor shaft is connected with the working element, so it has the remarkable characteristics of compact structure and small space occupation. However, this kind of integral die-casting of the outer rotor and the outer rotor end cover is an inseparable integral part, and the outer rotor After the shaft is press-fitted into the fixing hole in the center of the outer rotor connecting end cover with an interference tight fit, it often occurs that the axial concentricity deviation of the outer rotor shaft after fixing is too large and cannot be disassembled repair, causing the whole set of outer rotor assembly (including outer rotor, outer rotor connecting end cover, outer rotor shaft) to be scrapped as a whole. The process adopts the continuous automatic punching production process of outer rotor punching and stator punching. The number of outer rotor cores produced by the normal punching process and the number of stator cores are all in one-to-one correspondence. After the assembly process is completed, some of the outer rotor assemblies are unqualified (including the outer rotor core), which will inevitably cause the same amount of unmatched excess waste of the stator cores produced earlier. The final result, this part Excess stator cores can only be scrapped when they accumulate to a certain extent, which further expands the waste loss range and scrap value of the outer rotor AC motor, and increases the production cost. The overall die-casting structure and production process of the rotor, resulting in excessive scrap rate and high production cost, need to be corrected.

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