Patent ID: 8925182
Filing Date: 2015-01-06
Classification: H02K,Y10T

Abstract:
1. A method for forming a rotor assembly including a lamination stack and a cast rotor frame, the method including: preheating the lamination stack to a predetermined temperature, wherein the lamination stack defines a plurality of passages; positioning the preheated lamination stack in a mold cavity including a first mold portion defining a first end ring of the rotor frame, a second mold portion defining a second end ring of the rotor frame, and a cavity surface therebetween; wherein the preheated lamination stack is positioned in the mold cavity such that a peripheral surface of the lamination stack including the plurality of passages is in contact with the cavity surface of the mold cavity and the plurality of passages are in fluid communication with the first mold portion and the second mold portion to define a plurality of conductor bars of the rotor frame; introducing molten metal into the mold cavity at a velocity such that turbulent flow of the molten metal in the mold cavity is minimized, and such that the molten metal flows simultaneously through the plurality of passages prior to forming at least one of the first end ring and the second end ring; and solidifying the molten metal.