Patent ID: 6020661
Filing Date: 2000-02-01
Classification: H02K,Y10T

Abstract:
An injection molded electrical motor assembly comprising:a rotor assembly having a central rotor portion on a rotor shaft, and a rotor bearing disposed near each end of the rotor shaft;a unitary stator assembly included a stator lamination stack forming stator poles, stator windings carried on the stator poles, a front end cap positioned on one end of the lamination stack, and a high strength plastic unitizing member comprising a unitary injection molded non-cured plastic mass that substantially encapsulates the stator poles and the windings and fills interior voids of the lamination stack, thereby unitizing the stator assembly, the plastic mass extending to and forming an unitary rear end cap disposed on another end of the lamination stack opposite the front end cap; anda continuous bore formed in the stator assembly through the front end cap, the stator lamination stack, and the unitary rear end cap, the continuous bore defining mounting surfaces in the front and rear end caps for directly receiving and supporting the rotor bearings, the rotor assembly being carried within the bore formed in the stator assembly with the rotor beatings engaging the mounting surfaces in the end caps for support thereby, an air gap being defined between the central rotor portion and the stator lamination stack.