Method for assembling split stator core and assembly tool used thereby

Abstract

The invention discloses a method for assembling a split stator core and an assembly tool used thereby. The method comprises the following steps: a first core unit is placed on a splicing table with the outer cylindrical surface of an inner tube as a datum plane, and a positioning groove in the outer side face of the core unit and a positioning element on the top of the splicing table are positioned through embedding fit; other core units are sequentially spliced into a circular stator core through a connecting bulge and a connecting recess of the core unit; the stator core is tightly hooped by a hoop; the two ends of each weld are spot-welded and pre-fixed by laser; and the hoop divides each weld into an upper section and a lower section, and the upper section and the lower section of each weld are spot-welded by laser. According to the method of the invention, the core units are spliced by the inner tube and the hoop, which can improve the welding deformation resistance. The welds are pre-fixed by spot welding and spot-welded based on the principle of symmetry, which ensures the rounding precision of the stator core and improves the connecting strength. Moreover, the energy output of a single point of spot welding is low, the core has a small heat-affected zone and less deformation, and an inner water jacket and the stator core can be smoothly connected in a sleeving mode and fit tightly.

Description

technical field [0001] The invention is related to the motor manufacturing technology of new energy vehicles, in particular to an assembly method of a segmented stator core and a supporting assembly tooling. Background technique [0002] As a new type of environmentally friendly means of transportation, new energy vehicles have received more and more attention. Since they use motors to directly drive vehicles, they have higher requirements on the heat dissipation performance of the motors. In the motor, the main source of heat is the heat generated by the coil on the motor stator core during operation, so the heat dissipation of the motor is mainly carried away by the inner water jacket attached to the outer surface of the iron core. It can be seen that the smooth assembly and full fit of the stator core and the inner water jacket play a vital role in the heat dissipation of the motor, which requires the stator core to have a very high rounding quality, that is to say, the i...

AI Technical Summary

Problems solved by technology

Since argon arc welding will generate a lot of heat during welding, the residual stress of the stator core after welding is relatively large, which will cause serious deformation of the iron core and cannot meet the high precision requirements of the cylindricity dimension after forming

Images