(1) Cut, punch, shape and other processes of steel plate into motor shell. These processes are cold processing of metal plate, mold forming, anti-corrosion treatment (electrophoretic paint) on the surface of the finished motor shell, plastic spraying on the surface of defrosting radiator shell or directly processing with aluminum-plated zinc plate. The finished motor shell is assembled with permanent magnet ferrite tiles to form a motor stator assembly. The following figure:

(2) stamping the steel strip into a rotor blade by a high-speed punch and a progressive die, and laminating and pressing the rotor blade into an iron core; Press the iron core, commutator and other components onto the motor shaft by a press to form the rotor core; The enameled wire and commutator hook are spot-welded by an automatic winding machine, and tested by a rotor performance tester one by one. The qualified rotor is turned on the commutator surface by a high-speed lathe to ensure the roughness of the mating surface. Carry out dynamic balance detection of the rotor and balance it with balance mud, and the remaining unbalance is less than 0.03g After standing, the balance mud is naturally dried, and the rotor processing is completed. The following figure:

(3) Cut the wire into a specified length by the automatic offline machine and press the waterproof connector terminal, and weld the cut wire, carbon brush and other related electronic accessories to the brush holder by soldering, so as to complete the brush combination and various vehicle-mounted wiring harness processing. The following figure:

(4) The rotor assembly, stator assembly, brush assembly and other purchased accessories are assembled into a miniature DC permanent magnet motor by hand. After a series of tests such as rotating speed and current, and running-in with low voltage power supply, the motor products are finally processed. The following figure:

(5) Assemble the DC permanent magnet motor and other purchased accessories into a fan or water pump. The fan needs to pass the overall dynamic balance test, the unbalance is less than 0.15g, the hand touch has no detailed shock, and the noise is less than 57db；; The water pump needs to be subjected to pressure test, the test pressure is 0.3MPa, and the pressure is kept for 20 seconds without leakage. Finally, vehicle-mounted fan and water pump products are formed. The following figure: