Stator of outer rotor motor and assembly method

Abstract

The invention relates to the field of external rotor motors, and provides a stator of an external rotor motor and an assembly method, the stator comprises a stator core, the stator core comprises stator teeth (3), one end of each stator tooth is provided with a fixing head (33), and the outer side surface of each fixing head (33) is provided with a first fixing groove (32); the stator yoke (4) isprovided with a plurality of positioning grooves (42), and the inner side surfaces of the positioning grooves (42) are provided with second fixing grooves (41); wherein the plurality of stator teeth (3) are uniformly distributed at the periphery of the stator yoke (4) in the circumferential direction, the fixing head (33) is matched with a positioning groove (42) in the stator yoke (4), and the stator teeth (3) are detachably connected with the stator yoke (4); the pin (5) is matched with the first fixing groove (32) and the second fixing groove (41); and the winding coil (2) is wound on the stator teeth (3) of the stator core. The winding coil disclosed by the invention is easy to embed, does not damage an insulating material, and effectively improves the slot fullness rate.

Description

technical field [0001] The invention relates to the field of external rotor motors, in particular to a stator and an assembly method of an external rotor motor. Background technique [0002] In the external rotor motors of the prior art, the structure of the stator core is usually an integrated structure of the tooth yoke. Due to the limitation of the opening of the upper slot of the integrated stator, it is difficult to directly wind the winding or insert the wire, and the slot fill rate is low. Manufacturing costs are high. At the same time, the one-piece structure of the tooth yoke will lead to difficulties in inserting wires when using concentrated winding forming coils, and problems such as easy damage to insulating materials and winding coils. In the prior art, the formed coil has an inverted trapezoidal structure, with upper width and lower bottom narrow, and the teeth of the integrated stator core are also wider and narrower at the bottom. The process of inserting w...

AI Technical Summary

Problems solved by technology

[0002] In the external rotor motors of the prior art, the structure of the stator core is usually an integrated structure of the tooth yoke. Due to the limitation of the opening of the upper slot of the integrated stator, it is difficult to directly wind the winding or insert the wire, and the slot fill rate is low. high manufacturing cost

At the same time, the one-piece structure of the tooth yoke will lead to difficulties in inserting wires when using concentrated winding forming coils, and problems such as easy damage to insulating materials and winding coils

In the prior art, the formed coil has an inverted trapezoidal structure, with upper width and lower bottom narrow, and the teeth of the integrated stator core are also wider and narrower at the bottom. The process of inserting wires needs to first expand the lower side of the formed coil to make it wider than the teeth of the iron core. The width of the upper side, and then nest it on the upper side of the tooth, then loosen the lower side of the forming coil, and press it down until it is completely nested on the entire tooth. In the process of expanding the forming coil and nesting on the tooth, it is easy to damage Coil Insulation Material

In addition, open slots are usually used during installation, which deteriorates the air-gap magnetic density waveform, resulting in greater eddy current loss of the magnetic steel

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