Fan motor and manufacturing method of the same
AssigneeLG Electronics Inc.
InventorsChanglae Kim, Byungjik Kim, Sunggi Kim, Sanghyun Hong
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Abstract
A fan motor according to an embodiment of the present invention may include: an impeller a hub connected to a rotary shaft and at least one blade formed on the outer surface of the hub; a shroud surrounding the outer circumference of the impeller; and a coating layer coated on the inner circumferential surface of the shroud. The coating layer may include: a polymer having strength lower than the strength of the blade; and a plurality of beads mixed with the polymer and having strength higher than the strength of the polymer.
Claims15
A fan motor comprising:
- a motor configured to rotate a rotary shaft;
- an impeller including a hub connected to the rotary shaft and at least one blade disposed at an outer surface of the hub;
- a shroud that surrounds an outer circumference of the impeller;
- and
- a coating layer provided at an inner circumferential surface of the shroud,
- wherein the coating layer has areas having different thicknesses formed by grinding of the at least one blade,
- wherein the coating layer includes:
- a polymer, a hardness of the polymer being less than a hardness of the at least one blade, and
- a plurality of beads mixed with the polymer, a hardness of the plurality of beads being greater than the hardness of the polymer,
- wherein the areas of the coating layer include:
- a first area having a first thickness;
- and
- a second area having a second thickness less than the first thickness and toward the impeller, and
- wherein a number of beads per unit area of the second area is less than a number of beads per unit area of the first area.
A fan motor comprising:
- a motor configured to rotate a rotary shaft;
- an impeller including a hub connected to the rotary shaft and at least one blade disposed at an outer surface of the hub;
- a shroud that surrounds an outer circumference of the impeller;
- and
- a coating layer provided at an inner circumferential surface of the shroud,
- wherein the coating layer includes:
- a polymer, a hardness of the polymer being less than a hardness of the at least one blade, and
- a plurality of beads mixed with the polymer, a hardness of the plurality of beads being greater than the hardness of the polymer,
- wherein the coating layer includes:
- a first area having a first thickness, and
- a second area that faces the impeller in a radial direction of the impeller, at least a portion of the second area having a second thickness less than the first thickness, and
- wherein the second thickness varies along an inner circumferential direction of the shroud, and
- wherein a number of beads per unit area of the second area is less than a number of beads per unit area of the first area.
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.
Dependencies are inferred from the claim text.