Method of manufacturing an electric motor

摘要

A small inexpensive electric motor construction includes a housing with an axially extending wall having twelve (12) equally circumaxially spaced tabs projecting axially at its free edge. A cylindrical stator assembly is disposed within the axially extending wall and has its peripheral surface lying adjacent and radially within the tabs. A rotor shaft is supported by the housing and projects axially within the axially extending wall. The stator assembly is concentric with the shaft and may vary within a range from a concentric condition to a predetermined maximum condition of eccentricity relative to the axially extending wall. The tabs are deformed so as to expand radially into binding engagement with the peripheral surface of the stator assembly and secure the stator assembly within the housing wall irrespective of the concentricity and/or eccentricity within the predetermined maximum condition of eccentricity. The method and the apparatus for constructing the motor involve the use of a locating means which assures concentricity of stator assembly and shaft and the tabs are deformed with a means limiting radial outward expansion whereby to insure that the radial inward deformation is sufficient to insure binding engagement of the tabs with the peripheral surface of the stator assembly throughout the range of possible conditions of concentricity-eccentricity. Rivets secure the stator assembly axially against axial seating surfaces within the axially extending wall. Alternatively, the tab deformation and binding engagement with the peripheral surface of the stator assembly may be relied upon for radial location and both radial and axial retention of the stator assembly within the housing wall.