Process for the injection of an electric motor rotor

Abstract

A process for the injection of an electric motor rotor, said rotor comprising: a lamination stack () having a central axial bore () and a plurality of axial channels (); and a cage () of aluminum, which is formed by an upper end ring () and a lower end ring (), which are interconnected by a plurality of bars () molten in the axial channels (). The process comprises the steps of: mounting, at the upper end portion of the central axial bore (), a stamping pin (), which has a widened head () seated against the upper end lamination of the lamination stack (); heating the lamination stack, as well as an upper cavity () and a lower cavity () of a mold (); positioning the lamination stack () inside the mold (); rotating the mold () and pouring the aluminum into the inside thereof through the inlet channel (); removing, from the mold (), the rotor (R) with the cage () already formed and comprising an upper plate () that covers the stamping pin (); and axially extracting the stamping pin () in order to break, centrally, the upper plate (), transforming it in the upper ring () of the cage ().