PERMANENT MAGNET SYNCHRONOUS MOTOR

摘要

A permanent magnet synchronous motor includes a stator component and a rotor component. The stator component includes a casing (3), a stator core (1) and an armature winding (2), and the rotor component includes a rotor shaft (11), a magnetic-shield sleeve (12), magnetic poles (13), a permanent magnet (17) and insulation gaskets (20). The rotor shaft (11) is a hollow shaft radially provided with an inner vent hole (23), and the rotor shaft (11) is axially provided with an outer vent hole (22) communicated with the inner vent hole (23) of the hollow shaft. A magnetic-shield sleeve vent hole (24) is radially arranged on the magnetic-shield sleeve (12) and a magnetic pole vent hole (25) is radially arranged on the magnetic pole (13). The inner vent hole (23) is communicated with the magnetic-shield sleeve vent hole (24) and the magnetic pole vent hole (25) so as to form a radiant heat dissipation structure crossed in axial direction and radial direction. The motor controls temperature rise during operation, reduces risk of demagnetization of neodymium-iron-boron permanent magnet and eddy heat, and has a long operating life.