Patent ID: 8839503
Filing Date: 2014-09-23
Classification: F04D,H02K,Y10T

Abstract:
1. A method for manufacturing a stator assembly for an electric water pump, wherein the stator assembly generates a magnetic field according to a control signal and a rotor is rotated by the magnetic field generated at the stator assembly to pressurize coolant, the method for manufacturing the stator assembly comprising: a) stacking a plurality of pieces made of a magnetic material to form a core stack; b) molding an insulator to the core stack; c) coiling a coil to the insulator to form a single core-insulator assembly so as to form a magnetic path; and d) connecting a plurality of single core-insulator assemblies in an annular shape in sequence in a circumferential direction to form the stator assembly; wherein a mounting groove and a mounting protrusion are formed to the insulator with the step b) or between the steps of b) and c); wherein the insulator includes an interior circumferential portion, wherein one lateral side of the interior circumferential portion of the insulator is provided with the mounting groove along a full length of the lateral side in an axial direction of the stator assembly, and wherein the plurality of single core-insulator assemblies are connected with each other by inserting, in the axial direction of the stator assembly, the mounting protrusion of one single core-insulator assembly in into the mounting groove of an adjacent single core-insulator assembly.