Patent ID: 6864606

Claim:
An apparatus comprising: an engine including a shaft having a longitudinal axis, and a housing having a structure; a stator including a core and conductors disposed on the core, the core comprising a first plurality of laminations defining a first inner surface surrounding the longitudinal axis and comprising a first lamination, the first inner surface being disposed a first radius from the longitudinal axis in a radial plane, the first lamination having a first surface transverse to the axis, the first surface having a first width in the radial plane, a second plurality of laminations disposed adjacent to the first plurality of laminations, the second plurality of laminations defining a second inner surface surrounding the longitudinal axis and comprising a second lamination disposed adjacent to the first lamination, the second inner surface being disposed a second radius from the longitudinal axis in the radial plane, the second radius being greater than the first radius, the second lamination having a second surface partially disposed adjacent to the first surface and transverse to the axis, the second surface having a second width in the radial plane, the second width being less than the first width; a rotor coupled to the shaft, at least a portion of the rotor surrounding at least a portion of the core; wherein the first lamination includes a shelf defined by the portion of the first surface not being disposed adjacent to the second surface in the radial plane, and wherein the shelf and a portion of the second inner surface define a recess; and wherein the structure of the housing extends into the recess.