Patent ID: 9190878
Filing Date: 2015-11-17
Classification: H02K

Abstract:
1. A permanently magnetizable rotor having a central rotor structure including a rotor shaft supporting a cylindrical backiron, the rotor further including a multi-pole structure comprising circumferentially alternating pole elements, and a rotor cover extending longitudinally over the multi-pole structure, the rotor further comprising: an endcap including an engagement surface positioned in engagement with an end of the backiron, the endcap defining first and second anti-rotation features for preventing circumferential rotation of one or more of the pole elements about the backiron; wherein the first anti-rotation feature is configured differently than the second anti-rotation feature and each anti-rotation feature defines a torque transmitting feature for transmitting a torque from different locations on the multi-pole structure; and wherein the endcap includes a peripheral surface, and the first anti-rotation feature comprises discrete indentations extending into the peripheral surface alternating circumferentially along the peripheral surface with non-indented portions, and engaged by a plurality of circumferentially spaced corresponding discrete portions of an end of the rotor cover that extend in a radial direction inwardly past the non-indented portions of the peripheral surface of the endcap.