Permanent magnet brush micromotor and assembly method thereof

A permanent magnet brush micromotor, comprising:

• a mover assembly, comprising a motor shaft, and a core winding, a commutator and a bearing installed on the motor shaft, wherein the number of the bearings is two, and the two bearings are respectively arranged on two sides of the core winding;
• a stator assembly, comprising an upper stator bracket, a lower stator bracket, and a permanent magnet, a magnetic conductor and an electric brush installed on the upper stator bracket and the lower stator bracket;
• the upper stator bracket and lower stator bracket are provided with a concave part matched with half of the motor shaft, core winding, bearing and commutator, also provided is a brush mounting position for mounting the electric brush;
• an interface between the upper stator bracket and lower stator bracket is a plane passing through centerline of the motor shaft, the concave parts of the upper stator bracket and lower stator bracket are matched to form a complete mounting cavity for mounting the motor shaft, core winding, bearing and commutator, and the mover assembly is installed in the mounting cavity;
• the permanent magnet is installed on the upper stator bracket and lower stator bracket for generating a magnetic field;
• the magnetic conductors are respectively installed on the upper stator bracket and lower stator bracket and symmetrically arranged to form a closed magnetic conduction frame for conducting the magnetic field;
• the electric brush is mounted at the brush mounting position and contacts with the commutator of the mover assembly;
• and
• the upper stator bracket and lower stator bracket are arranged with an electric brush pressing position respectively, the electric brush pressing position is used for matching with the opposite brush mounting position and pressing the electric brush, the electric brush comprises an upper electric brush and a lower electric brush, the upper electric brush is installed on the brush mounting position of the upper stator bracket, and the lower electric brush is installed on the brush mounting position of the lower stator bracket, the upper electric brush and lower electric brush respectively extend to a placing position of the commutator, so that when the upper stator bracket and lower stator bracket are assembled, the upper electric brush and lower electric brush can respectively abut against outer walls of both sides of the commutator.