Hollow shaft motor

A hollow shaft motor, comprising:

• a stator assembly 10 comprising:
• a stator 11 comprising a stator core 110, an upper insulator 111 coupled to an upper part of the stator core 110, a lower insulator 112 coupled to a lower part of the stator core 110, and a coil 113 wound around teeth of the stator 11;
• and a busbar unit 12 coupled to an upper part of the stator 11;
• and
• a motor housing 20 formed around the stator assembly 10 by resin molding,
• wherein the busbar unit 12 comprises a plurality of busbars 120 and a pre-mold 121 to which the busbars 120 are fixed,
• wherein the busbar 120 comprises a busbar body 120A, a plurality of coil connection parts 120B formed in the busbar body 120A in an outer radial direction, and a terminal 120C extending upward from an end of the busbar body 120A, and
• wherein the pre-mold 121 comprises an annular ring part 121A coupled to an upper part of the busbar body 120A, a first coupling block 121B formed on one side of the annular ring part 121A, a second coupling block 121C formed on another side of the annular ring part 121A, and a terminal guide 121D protruding upward from another side of the annular ring part 121A.