Patent ID: 9748807
Date: 2017-08-29
CPC Classifications: H02K

Claim:
1. A motor, comprising a stator assembly and a rotor assembly inserted into the stator assembly, wherein the stator assembly comprises a stator core and a winding; the stator core comprises a yoke and a plurality of teeth protruding inwards from the yoke; between two adjacent teeth formed is a winding slot; the winding is arranged in the winding slot, and wound on the teeth; the rotor assembly comprises a rotor core and a permanent magnet; the rotor core comprises an annular ring having a central axial bore and a plurality of magnetic induction blocks protruding outwards from an outer side of the annular ring; a radial recess is formed by two opposing side surfaces of two adjacent magnetic induction blocks, respectively, and a portion of the outer side of the annular ring is surrounded by the two opposing side surfaces; the portion of the outer side of the annular ring forms an innermost end of the radial recess; a boss is disposed on the middle of the innermost end and protrudes towards an opening of the radial recess; the boss comprises a top part and a bottom part; the top part is in a shape of a semi-sphere and comprises a top point; the bottom part is in a substantially cylindrical shape; the top part is disposed on the bottom part; the permanent magnet is mounted on the top point and is spaced from the innermost end by the boss, wherein two cavities are formed between the permanent magnet and the innermost end; the magnetic induction blocks at both sides of an opening of the radial recess protrude with a hook block; and a thickness of the rotor core is larger than that of the stator core.