Rotor structure for interior permanent magnet electromotive machine including laminations profiled along a segment of a bridge to define a concave and curved bridge profile

An electromotive machine comprising:

• a stator;
• and
• a rotor operably coupled to the stator, the rotor having a plurality of stacked rotor laminations each comprising:
• at least one slot arranged to receive at least one permanent magnet, wherein said slot divides the rotor lamination into a pole region and a yoke region;
• and
• at least one bridge between the slot and an outer edge of the lamination, wherein the outer edge of the lamination is profiled along a segment of the bridge to define a concave curved profile for the bridge, wherein the concave curved profile for the bridge allows to selectively size a thickness of the bridge, wherein the concave curved profile of the bridge comprises a radius and further allows to selectively size a thickness of a center post arranged to further connect the pole region to the yoke region, wherein a combined sizing of the thickness of the bridge and the thickness of the center post is selected to balance at least some counter-opposing electromagnetic and/or mechanical characteristics of the machine and wherein the radius of the concave curved profile of the bridge is at least one half a length of the bridge.