Stator for axial gap type electric motor and manufacturing method therefor

A stator for an axial gap type electric motor, the stator comprising:

• a waterproof partition wall placed above a body case with a sealed lower space and separated from a rotor placed in a fluid flow passage;
• and
• a stator for rotating and driving the rotor, wherein
• a stator core of the stator has a front end portion which is embedded into the waterproof partition wall so that the front end portion is exposed to the fluid flow passage, and a waterproof coating film made of a thinner film than the waterproof partition wall is formed at the front end portion of the stator core exposed to the fluid flow passage.

A method of manufacturing a stator for an axial gap type electric motor, the method comprising:

• preparing a plurality of teeth each including a coil winding portion and a shoe having a flange formed to extend from the coil winding portion by compression-molding soft magnetic composites (SMC) powder;
• forming a waterproof coating film on an exposed surface of the shoe facing the magnet of the rotor;
• winding a coil around a respective body of bobbins;
• integrating the plurality of teeth into a waterproof partition wall of a body case by insert-molding only the shoe portion of each of the plurality of teeth into the waterproof partition wall arranged above the body case and performing injection molding of the coil winding portion of each of the teeth toward the lower portion of the body case;
• assembling each of the bobbins around which the coil has been wound on the coil winding portion of each of the teeth;
• and
• coupling an assembly hole of a back yoke to a lower end portion of the coil winding portion protruding to a lower end portion of each of the bobbins and fixing the back yoke to prevent separation of the back yoke.