Stator assembly and motor

Abstract

The invention discloses a stator assembly and a motor. The stator assembly comprises a stator core and a stator winding, the stator core is provided with N grooves, the stator winding is formed by winding a plurality of hairpin coils in the grooves, each phase of stator winding comprises two sub-windings, each sub-winding is provided with a plurality of hairpin coils, and the hairpin coils are distributed in L different layers of the N grooves. The plurality of hairpin coils of each sub-winding comprise a first hairpin coil positioned on a first layer, a second hairpin coil positioned on an Lth layer, and middle hairpin coils positioned between the first layer and the Lth layer; one of the two first hairpin coils is a long-distance hairpin coil, the other hairpin coil is a short-distance hairpin coil, one of the two second hairpin coils is a short-distance hairpin coil correspondingly, and the other hairpin coil is a long-distance hairpin coil; the total number of the middle hairpin coils of the two sub-windings is the same, the pitch types of the middle hairpin coils are the same, and the distribution of the pitch types is the same. Counter electromotive force, resistance and inductance of all the sub-windings are the same, and the assembly efficiency of the windings is improved.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a stator assembly and a motor. Background technique [0002] The peak power density of drive motors for new energy vehicles must reach 4kW / kg. Currently, the peak power density of motors is 3.2-3.3kW / kg, and there is still much room for improvement. In order to improve power density, flat wire motors are the future development direction of automotive drive motors. Compared with round wire motors, flat wire motors have higher slot fill ratios, shorter winding ends, higher power density, and stronger heat dissipation capabilities. , especially suitable for the miniaturization and light weight application requirements of vehicle drive motors. [0003] However, the existing flat wire motors have more severe skin effect than round wire motors and lower assembly efficiency. In order to weaken the skin effect, flat wire motors usually increase the number of conductor layers in the slot ...

AI Technical Summary

Problems solved by technology

[0003] However, the existing flat wire motors have more serious skin effect than round wire motors and the assembly efficiency is not high. In order to weaken the skin effect, flat wire motors usually increase the number of conductor layers in the slot and reduce the thickness of flat wires

As the number of flat wire layers increases, the winding connection methods increase accordingly. Unreasonable connection methods will cause unbalanced winding inductance, which will cause winding circulation, increase the additional copper loss of the winding, and cause inconvenience in the assembly of flat wire windings.

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