Patent ID: 11859639
Assignee: LG ELECTRONICS INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 14:
15. A method of manufacturing a fan motor that includes an impeller having a blade and a shroud surrounding an outer circumference of the impeller, the method comprising:
forming a coating layer on an inner circumferential surface of the shroud; and
rotating the impeller while inserting the impeller into the shroud to cause the blade to grind at least a portion of the coating layer on the inner circumferential surface of the shroud,
wherein an area in which thickness varies in a circumferential direction of the impeller by grinding by the impeller is formed in the coating layer,
wherein the coating layer includes:
a polymer having a strength lower than that of the blade of the impeller; and
a plurality of beads mixed with the polymer and having a strength higher than that of the polymer, and

wherein the polymer is ground along cracks connecting at least some of the plurality of beads.