Patent ID: 8772994
Filing Date: 2014-07-08
Classification: H02K

Abstract:
1. A permanent-magnet (PM) rotor comprising: a rotor core having an outer perimeter and an axis of rotation and defining a plurality of openings through at least a portion of the rotor core; and six or more PM bulks internally coupled to the rotor core at equiangular intervals around the axis of rotation such that each PM bulk is disposed within a different one of the openings, each PM bulk having a thickness; where the openings are configured to include open spaces at opposing ends of each PM bulk, the open spaces having a width that is larger than the thickness of the PM bulk and each open space extending around an opposing end of a PM bulk to terminate between the PM bulk and the outer perimeter of the rotor core; and where the rotor core is configured to have a plurality of magnetic insulation bridges each disposed between adjacent openings and each having a pair of non-parallel opposing sides that partially define adjacent openings, each magnetic insulation bridge having an outer portion and an inner portion that is: (i) wider than the outer portion and (ii) closer to the axis of rotation than the outer portion.