Method of assembling a dynamoelectric machine

Abstract

Abstract AN ELECTRIC MOTOR HAVING A STATOR WITH A CENTRAL BORE, A ROTOR PART ROTATABLY MOUNTED IN THE BORE, FORMED SHEET METAL END SHIELDS SECURED TO THE STATOR, AND BEARING ASSEMBLIES PRESS FITTED IN THE END SHIELDS FOR ROTATABLY SUPPORTING THE ROTOR SHAFT. EACH END SHIELD INCLUDES A CENTRAL SEAT FOR SUPPORTING THE BEARING ASSEMBLY. IN ONE EMBODIMENT, THE SEAT INCLUDES AN AXIALLY INWARDLY EXTENDING CUP INTEGRAL WITH A FORMED SHEET MATERIAL END SHIELD, AND IN ANOTHER EMBODIMENT THE SEAT IS MERELY A LIP DEFINING A HOLE IN THE END SHIELD, AND A SEPARATE CUP FORMS A PART OF THE BEARING ASSEMBLY. THE BEARING ASSEMBLY INCLUDES A SPRING SUPPORTED BY THE CUP FOR BIASING THE BEARING AGAINST A SEATING SURFACE IN THE BEARING ASSEMBLY. THE MOTOR IS ASSEMBLED BY COATING THE STATOR WITH A VARNISH, ALLOWING THE VARNISH TO AIR DRY TO A SEMI-CURE STATE, PLACING THE END SHIELD ON THE STATOR IN CONTACT WITH THE VARNISH, WITH THE BEARING IN CONTACT WITH A SPACER ON THE ROTOR SHAFT, CURING THE VARNISH, DEFLECTING A PORTION OF THE END SHIELD AROUND THE SEAT INWARDLY, THEREBY SHIFTING THE BEARING WITH RESPECT TO THE SEAT, AND RELEASING THE END SHIELD WITH THE BEARING MAINTAINED IN ITS SHIFTED POSITION, THEREBY ESTABLISHING A DESIRED END PLAY FOR THE ROTOR.

Inventors

• 👤 J Lewis

Bibliographic Details