Abstract: A permanent magnet rotor core includes a plurality of rotor poles circumferentially-spaced about a central axis and including a first rotor pole and an adjacent second rotor pole that each include an outer wall, and wherein the rotor core includes a rotor diameter. The rotor core also includes a plurality of radial apertures alternately-spaced with the plurality of rotor poles. The rotor core also includes a first protrusion extending from the first rotor pole into a first radial aperture of the plurality of radial apertures positioned between the first rotor pole and the second rotor pole. The rotor core further includes a second protrusion extending from the second rotor pole into the first radial aperture such that a circumferential opening is defined between the first protrusion and the second protrusion. The opening extends a first length of between approximately 0.052% and approximately 0.058% of the rotor diameter.

Abstract: A reconfigurable tracking arrangement for an object includes a repositionable mounting arrangement that may be configured to releasably connect to an object for selectively positioning the same. The mounting arrangement may further include a first piece attached to the object and a second piece that can be repositioned relative to the first piece. In addition, the mounting arrangement may be configured to be secured in at least two stable pre-configured positions about the object.