METHOD OF MANUFACTURING AN ELECTRIC ROTARY MACHINE

• US 3,827,141 A
• Filed: 04/19/1973
• Issued: 08/06/1974
• Est. Priority Date: 05/17/1972
• Status: Expired due to Term

• Current Assignee: Stig Lennart Hallerback
• Original Assignee: Stig Lennart Hallerback
• Inventors: Hallerback, Stig Lennart
• Primary Examiner(s): Lanham, Jr., Charles W.
• Assistant Examiner(s): Hall, Carl E.
• Application Number:
  US05/352,736
• Time in Patent Office: 474 Days
• Field of Search: 29/596,598,609 310/42,43,217,218,254,259
• US Class Current: 29/596
• CPC Class Codes: H02K 1/16 Stator cores with slots for windings
• CPC Class Codes: H02K 15/12 Impregnating, heating or drying of windings, stators, rotors or machines
• CPC Class Codes: H02K 15/14 Casings; Enclosures; Supports
• CPC Class Codes: H02K 3/38 around winding heads, equalising connectors, or connections thereto
• CPC Class Codes: H02K 3/50 Fastening of winding heads, equalising connectors, or connections thereto
• CPC Class Codes: H02K 5/08 Insulating casings
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine
• CPC Class Codes: Y10T 29/49078 Laminated

Abstract

The invention relates to electric rotary machines. It provides an electric rotary machine with a stator structure the stator teeth of which are shaped as separate elements and are bonded to the stator ring and the stator windings into a rigid assembly.

Claims

1. A method for manufacturing an electric rotary machine comprising a rotor and a stator core consisting of a plurality of circumferentially spaced radially directed teeth defining stator slots, a thin walled tubular element of non-magnetic material disposed interiorly of the teeth, windings in the stator slots and a moulding securing the tubular member, windings and stator teeth to provide a rigidly assembled stator unit consisting of the steps of forming the teeth from a a plurality of laminations, said teeth having substantially their final dimension, supporting the stator teeth so that the stator slots open radially outwardly, positioning the tubular member interiorly of the teeth so that it extends axially outwardly beyond the end faces of the stator core to provide aligning and abutment means for supporting the rotor within the stator, inserting the windings in the stator slots, applying a curable moulding compound to secure the teeth and stator windings as an integral assembly, assembling the rotor in the stator so that it is positioned by the aligning and abutment means.

2. A method as claimed in claim 1 wherein the teeth are formed from flux oriented laminations and have a flank profile flared to define shoulders at their inner radial ends that are spaced apart a small distance whereby in the assembled stator optimum magnetic flux flow radially through the stator teeth is obtained.

3. A method as claimed in claim 1 including the step of assembling a stator ring adjacent the outer periphery of said stator teeth.

4. A method according to claim 1, wherein the thin-walled tubular member is supported by a mandrel during the insertion of the stator windings and the application of the curable molding compound.

5. A method according to claim 1, wherein the teeth of the stator core are subjected to a heat treatment before assembly.

6. A method according to claim 5, wherein the heat treatment is carried out at a temperature of about 800*C.