Permanent magnet brushless direct current motor

According to the technical scheme, the permanent magnet brushless direct current motor is characterized in that a heat dissipation structure is arranged and used for solving the problem that a motor body is poor in heat dissipation performance, and an installation structure is arranged and used for solving the problem that installation and fixation are tedious; through the arrangement of the threaded seat, the flowing of air inside and outside the motor body is realized, the heat in the motor body is convenient to discharge, and through the arrangement of the dustproof net and the drying agent, dust prevention, drying and dehumidification can be performed on the heat-exchanged air during heat exchange, and the inconvenience of dust and other impurities or moisture to the work of the motor body is avoided; by pressing the pressing frame, the mounting block descends to be completely separated from the interior of the mounting hole, then the clamping block can be separated from the interior of the clamping groov