Patent ID: 9551347
Date: 2017-01-24
CPC Classifications: F04D,H02K

Claim:
1. A water pump motor having a stator and an inner type rotor disposed inside of the stator, the water pump motor comprising: a stator including a stator core: the stator core comprising: a plurality of protrusions annularly arranged, wherein each of the protrusions protrudes in a radial direction, and radial inner portions of neighboring protrusions are connected with each other to form a physically integral form of the stator core; a bobbin in which the stator core is embedded except for a radial outer portion of each of the protrusions, wherein the bobbin comprises: a plurality of coil winding portions each surrounding a corresponding protrusion except for the radial inner portions and the radial outer portions of the stator core such that each protrusion is surrounded by a coil winding portion of the bobbin, a coil wound around the coil winding portions, an outer flange formed on a radial outer portion of each coil winding portion, and a ring-shaped inner flange formed on a radial inner portion of each coil winding portion, wherein the ring-shaped inner flange connects radial inner portions of neighboring coil winding portions to form a cup-shape composed of an open top portion, a hollow center portion and a closed bottom portion, and wherein a rotor is inserted into the hollow center portion, and a bearing for the rotor is seated in a groove formed in a center portion of the closed bottom portion; and an annular back yoke having a plurality of coupling grooves formed on an inner circumferential portion thereof, the radially outer portions of the stator core being coupled with the coupling grooves.