Rotary machine

• US 5,075,585 A
• Filed: 05/31/1990
• Issued: 12/24/1991
• Est. Priority Date: 09/25/1989
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Teruyama, Hidetoshi, Aoki, Yukio
• Primary Examiner(s): Hall, Carl E.
• Application Number:
  US07/531,411
• Time in Patent Office: 572 Days
• Field of Search: 310/42, 310/89, 310/90, 310/91, 310/254, 29/596, 29/598
• US Class Current: 310/89
• CPC Class Codes: H02K 5/15 Mounting arrangements for bearing-shields or end plates
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine

Abstract

A rotary machine having a stator assembly constructed by joining brackets to a stator core by all-round laser welding without entailing the thermal deformation of those components. The omission of through-bolts for fastening together the stator core and the brackets and the resultant omission of through holes in the stator core for receiving the through-bolts reduces the outside dimensions of the laminations of the stator core. Superfluous spaces in the stator assembly are filled with a resin to prevent the condensation of moisture attributable to temperature variation within the rotating machine, to provide the rotating machine with a high rigidity, to suppress vibrations and to enhance heat transfer from the stator coils to the brackets.

Claims

1. A rotary machine comprising:

a stator core having a periphery which is externally exposed as a casing of said rotary machine, provided with an end plate on a side surface thereof;

a bracket having a bore fitted to a machine sized portion formed on an inner side of the periphery of said end plate relative to said periphery of said stator core and a surface butted to a butt surface formed on an outer side of the periphery of said end plate perpendicular to said inner side;

the butt surface of said end plate and the surface of said bracket being joined together by laser-welding in order to incorporate said stator core and said bracket in one body.

2. A rotary machine as set forth in claim 1, wherein said end plate is fixed to said stator core by tungsten inert gas welding or rivet caulking.

3. A rotary machine as set forth in claim 1, wherein said laser-welding is performed by welding the surfaces of said end plate and said bracket from an outer side of the periphery of said end plate.

4. A rotary machine as set forth in claim 1, wherein a superfluous space formed in the vicinity of a stator coil by said stator core and said bracket, is filled with a resin.