Patent ID: 9634533
Date: 2017-04-25
CPC Classifications: H02K,Y10T

Claim:
1. A motor comprising a stationary portion and a rotating portion; wherein the stationary portion includes: a plurality of teeth each having a shape of a column extending in a radial direction with respect to a central axis extending in a vertical direction, each tooth including a pair of circumferential side surfaces extending in an axial direction; insulators each arranged to cover portions of a surface of a separate one of the teeth; and coils each defined by a conducting wire wound around a separate one of the insulators; the rotating portion is arranged radially inward of the teeth, the insulators, and the coils, and is supported to be rotatable about the central axis with respect to the stationary portion; each insulator includes: an upper frame portion arranged to cover a pair of upper corner portions of a corresponding one of the teeth, each upper corner portion extending in the radial direction; a lower frame portion arranged to cover a pair of lower corner portions of the corresponding tooth, each lower corner portion extending in the radial direction; and an opening portion arranged to extend along the circumferential side surfaces of the corresponding tooth below the upper frame portion and above the lower frame portion; the stationary portion further includes resin bodies defined integrally with one another to define a single monolithic member, each resin body including: an inner resin portion arranged between a corresponding one of the teeth and a corresponding one of the coils, and between the corresponding tooth and a corresponding one of the insulators; an outer resin portion arranged to cover circumferentially outer sides and axially outer sides of the corresponding coil; and a connecting resin portion arranged on a radially outer side or a radially inner side of the corresponding coil; the inner and outer resin portions are arranged to be continuous with each other through the connecting resin portion; the inner resin portion is arranged to be in contact with both the circumferential side surfaces of the corresponding tooth and the conducting wire in the opening portion; the upper frame portion includes a pair of upper corner covers each arranged to extend in the radial direction; the lower frame portion includes a pair of lower corner covers each arranged to extend in the radial direction; each insulator includes: an upper joining portion arranged to on the upper corner covers to each other in a circumferential direction; and a lower joining portion arranged to-join the lower corner covers to each other in the circumferential direction; the upper joining portion has axial and radial thicknesses smaller than axial and radial thickness of each of the upper corner covers; and the lower joining portion has axial and radial thicknesses smaller than axial and radial thicknesses of each of the lower corner covers; and a portion of the coils is not axially overlapped by either of the upper joining portion and the lower joining portion.