Gas-cooled electrical machine

• US 5,602,435 A
• Filed: 08/17/1994
• Issued: 02/11/1997
• Est. Priority Date: 08/17/1993
• Status: Expired due to Fees

• Current Assignee: Asea Brown Boveri AG (ABB Limited)
• Original Assignee: ABB Management AG (ABB Limited)
• Inventors: Iseli, Markus, Koppetsch, Lothar, Zimmermann, Hans
• Primary Examiner(s): Dougherty, Thomas M.
• Assistant Examiner(s): Link, Jonathan
• Application Number:
  US08/291,829
• Time in Patent Office: 909 Days
• Field of Search: 310/53, 310/55, 310/56, 310/58, 310/59, 310/60 A, 310/61, 310/62, 137/625.28, 62/406, 376/370
• US Class Current: 310/55
• CPC Class Codes: H02K 9/10 by gaseous cooling medium flowing in closed circuit, a part of which is external to the machine casing

Abstract

In the case of a gas-cooled electrical machine, the effective flow cross-section of the connection from the outer hot-gas chambers to the cooler is provided with an adjustable restrictor device (29, 31; 32, 33). In this way, the splitting of the various cooling-air flows within the machine can be influenced, without intervention in the actual machine, such that equalization of the temperature level in the machine longitudinal direction is achieved.

Claims

1. An electrical machine comprising:

a foundation having a foundation pit with coolers therein;

a housing mounted on said foundation;

a rotor in said housing;

a stator in said housing, said stator having a laminated stator core and winding conductors arranged in slots on an internal circumference of the laminated stator core, the laminated stator core comprising individual laminated core elements separated from one another by spacer webs to form radial cooling slits;

cold gas chambers positioned in said housing at an external circumference of said laminated stator core;

hot gas chambers positioned in said housing between an external circumference of said laminated stator core and said housing for receiving hot gas from said radial cooling slits;

perforations formed in at least one metal plate in said housing, and located between said stator and said coolers, for permitting the hot gas in said hot gas chambers to flow to said coolers in said foundation pit so as to be cooled;

means for circulating the cooled gas in said foundation pit to said cold gas chambers; and

at least one restrictor device at said perforations for restricting and controlling the flow of hot gas from said hot gas chambers to said coolers, wherein said restrictor device comprises a perforated plate movable relative to said at least one metal plate, and wherein at least the at least one metal plate comprises a plurality of plate elements in order to simplify assembly/disassembly.

2. An electrical machine comprising:

a foundation having a foundation pit with coolers therein;

a housing mounted on said foundation;

a rotor in said housing;

a stator in said housing, said stator having a laminated stator core and winding conductors arranged in slots on an internal circumference of the laminated stator core, the laminated stator core comprising individual laminated core elements separated from one another by spacer webs to form radial cooling slits;

cold gas chambers positioned in said housing at an external circumference of said laminated stator core;

hot gas chambers positioned in said housing between an external circumference of said laminated stator core and said housing for receiving hot gas from said radial cooling slits;

perforations formed in at least one metal plate in said housing, and located between said stator and said coolers, for permitting the hot gas in said hot gas chambers to flow to said coolers in said foundation pit so as to be cooled;

means for circulating the cooled gas in said foundation pit to said cold gas chambers; and

at least one restrictor device at said perforations for restricting and controlling the flow of hot gas from said hot gas chambers to said coolers,

wherein the at least one metal plate comprises a plurality of plate elements which are spaced apart from one another and leave a gap free between them.

3. The machine as claimed in claim 2, wherein at least the metal plate is divided into a plurality of plate elements in order to simplify assembly/disassembly.

4. The machine as claimed in claim 2, wherein said restrictor device comprises a slitted plate whose slits are arranged and distributed in such a manner that a predetermined effective cross-sectional constriction can be achieved by displacing the slitted plate relative to the plate elements.

5. An electrical machine comprising:

a foundation having a foundation pit with coolers therein;

a housing mounted on said foundation;

a rotor in said housing;

a stator in said housing, said stator having a laminated stator core and winding conductors arranged in slots on an internal circumference of the laminated stator core, the laminated stator core comprising individual laminated core elements separated from one another by spacer webs to form radial cooling slits;

cold gas chambers positioned in said housing at an external circumference of said laminated stator core;

hot gas chambers positioned in said housing between an external circumference of said laminated stator core and said housing for receiving hot gas from said radial cooling slits;

perforations formed in at least one metal plate in said housing, and located between said stator and said coolers, for permitting the hot gas in said hot gas chambers to flow to said coolers in said foundation pit so as to be cooled;

means for circulating the cooled gas in said foundation pit to said cold gas chambers; and

at least one restrictor device at said perforations for restricting and controlling the flow of hot gas from said hot gas chambers to said coolers,

wherein said restrictor device comprises a perforated plate movable relative to said at least one metal plate, and wherein the at least one metal plate comprises a plurality of plate elements which are spaced apart from one another and leave a gap free between them.