Generator inspection assembly

• US 20080098832A1
• Filed: 10/27/2006
• Published: 05/01/2008
• Est. Priority Date: 10/27/2006
• Status: Active Grant

• Current Assignee: Siemens Energy Incorporated (Siemens AG)
• Original Assignee: Siemens Power Generation, Inc.
• Inventors: Abbasi, Waheed A., Fischer, Mark W., Guthrie, Mark D., Miller, Joshua R.
• Granted Patent: US 7,520,189 B2
• Time in Patent Office: Days
• US Class Current: 73/865.9
• CPC Class Codes: H02K 15/00 Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines

Abstract

An inspection system is provided for inspecting a generator including a rotor and a stator substantially surrounding the rotor. The rotor has a first end with a first circumference, and a second end with a second circumference. The inspection system includes first and second retaining rings disposed at or about the first and second ends of the rotor, and first and second motion control modules movably coupled to the first and second retaining rings. The first and second motion control modules are interconnected and guide a carriage assembly therebetween in order to perform an operation on the generator. At least one of the first and second motion control modules is structured to receive the carriage assembly and to move around the corresponding first or second circumference of the generator rotor, in order to align the carriage assembly with stator slots of the stator of the generator.

Claims

1. An inspection system for inspecting a generator including a rotor and a stator substantially surrounding said rotor, said rotor having a first end with a first circumference and a second end with a second circumference, said stator including a plurality of stator slots, said inspection system comprising:

a first retaining ring structured to be disposed at or about the first end of said rotor;

a second retaining ring structured to be disposed at or about the second end of said rotor distal from said first retaining ring;

a first motion control module movably coupled to said first retaining ring;

a second motion control module movably coupled to said second retaining ring, said second motion control module being interconnected with said first motion control module;

electrical equipment; and

a carriage assembly structured to transport at least some of said electrical equipment within said generator and between said first motion control module and said second motion control module, in order to perform an operation on said generator,

wherein each of said first motion control module and said second motion control module is structured to receive said carriage assembly and to move around a corresponding one of said first circumference of the first end of said rotor and said second circumference of the second end of said rotor, respectively, in order to align said carriage assembly with a predetermined one of said stator slots of said stator of said generator.

2. The inspection system of claim 1 wherein said carriage assembly comprises:

a body including a first end, a second end, a first side, a second side, a top, and a bottom,

a nose assembly pivotably coupled to the first end of said body,

a tail pivotably coupled to the second end of said body, and

a track assembly coupled to at least one of the first side of said body and the second side of said body.

3. The inspection system of claim 2 wherein said body of said carriage assembly further comprises a slot guide coupled to one of said top of said body and said bottom of said body;

and wherein when said carriage assembly is inserted into said predetermined one of said stator slots, said slot guide engages said predetermined one of said stator slots in order to maintain said carriage assembly in proper alignment with respect to said predetermined one of said stator slots as said carriage assembly moves therethrough.

4. The inspection system of claim 2 wherein said at least some of said electrical equipment which is transported by said carriage assembly includes a number of power cables;

wherein at least one of said body of said carriage assembly, said nose assembly of said carriage assembly, and said tail of said carriage assembly includes a groove structured to receive said power cables; and

wherein said carriage assembly further comprises a cover coupled to said body in order to secure said power cables within said groove.

5. The inspection system of claim 2 wherein said nose assembly comprises a nose member and camera assembly;

wherein said nose member includes a first side, a second side, and a number of drive shafts extending between the first side and the second side; and

wherein said camera assembly is movable back and forth on said drive shafts between the first side of said nose member and the second side of said nose member.

6. The inspection system of claim 5 wherein said camera assembly comprises:

a first case,

a number of cameras and at least one illuminating device disposed on and supported by said first case,

a motor including at least one gear which turns around said drive shafts of said nose member, in order to move said camera assembly back and forth thereon, and

a second case coupled to said first case, said second case being structured to secure and protect at least one of said cameras, said at least one illuminating device, and said motor.

7. The inspection system of claim 6 wherein said cameras comprise a first camera disposed at or about a first end of said first case of said camera assembly, in order to view in front of said carriage assembly, and a second camera and a third camera disposed toward the opposite end of said first case of said camera assembly;

wherein said second camera and said third camera are structured to view above and below said carriage assembly, respectively; and

wherein said at least one illuminating device comprises a plurality of LEDs coupled to said first case of said camera assembly proximate each of said first camera, said second camera, and said third camera.

8. The inspection system of claim 2 wherein said at least some of said electrical equipment which is transported by said carriage assembly includes an ELCID coil;

and wherein said nose assembly further comprises an ELCID holder structured to removably receive said ELCID coil.

9. The inspection system of claim 2 wherein said track assembly comprises:

a number of track hinges coupled to said body of said carriage assembly,

a number of gears coupled to said track hinges, and

at least one tread coupled to said gears,

wherein said at least one tread is structured to grip said generator, and

wherein said gears are structured to rotate, thereby turning said at least one tread in order to facilitate movement of said carriage assembly through said generator.

10. The inspection system of claim 9 wherein said track assembly further comprises a number of magnets structured to attract said track assembly and said carriage assembly to said generator.

11. The inspection system of claim 2 wherein said carriage assembly includes a side profile having a height;

and wherein the height of said side profile of said carriage assembly is less than about 0.75 inches.

12. The inspection system of claim 2 wherein at least one of said first motion control module and said second motion control module comprises:

a docking cart including a frame structured to receive said carriage assembly and to move said carriage assembly about said corresponding one of said first circumference of the first end of said rotor on said first retaining ring and said second circumference on said second retaining ring of the second end of said rotor, respectively,

a number of motors coupled to said frame of said docking cart,

a guide assembly for guiding said carriage assembly into said docking cart,

a plurality of wheels for facilitating movement of said docking cart about said corresponding one of said first circumference and said second circumference,

a transverse transport assembly for moving said carriage assembly back and forth between said first motion control module and said second motion control module, and

a radial transport assembly for moving said carriage assembly around said corresponding one of said first circumference and said second circumference of the first end and the second end of said rotor of said generator, respectively.

13. The inspection system of claim 12 wherein said frame of said docking cart includes a first side, a second side, a first end, and a second end;

wherein said wheels comprise a plurality of lateral wheels coupled to the first side and the second side of said frame of said docking cart, and a number of guide members coupled to the second end of said frame of said docking cart; and

wherein said lateral wheels and said guide members are adjustable with respect to said frame of said docking cart in order to accommodate said corresponding one of said first circumference and said second circumference of the first end and the second end of said rotor of said generator.

14. The inspection system of claim 12 wherein said guide assembly of said docking cart comprises a slide coupled to said frame of said docking cart, and a catch coupled to said slide at or about the second end of said frame of said docking cart;

wherein said slide permits said carriage assembly to smoothly transition from said generator into said frame of said docking cart; and

wherein said catch receives said tail of said carriage assembly in order to guide said carriage assembly into proper alignment within said frame of said docking cart.

15. The inspection system of claim 12 wherein said transverse transport assembly comprises:

a first motor coupled to said frame of said docking cart and including a spool and a clutch, and

at least one cable extending between said first motion control module and said second motion control module, said at least one cable being coupled at one end to said spool and at the other end, to said carriage assembly,

wherein said clutch of said first motor is operable between an engaged mode corresponding to said first motor turning said spool and winding said at least one cable, and a disengaged mode in which said spool is free to rotate independent from said first motor, and

wherein when said clutch of said first motor of one of said first motion control module and said second motion control module is in said engaged mode, said clutch of said first motor of the other one of said first motion control module and said second motion control module is in said disengaged mode, in order that said transverse transport assembly moves said carriage assembly toward the one of said first motion control module and said second motion control module which has said clutch in said engaged mode.

16. The inspection system of claim 15 wherein said tail of said carriage assembly includes a hole;

and wherein one end of said at least one cable of said transverse transport assembly engages said hole in order to pull said carriage assembly through said generator.

17. The inspection system of claim 12 wherein said radial transport assembly comprises:

a number of first sprockets pivotably coupled to the first side of said frame of said docking cart,

a number of second sprockets pivotably coupled to the second side of said frame of said docking cart,

a chain engaging and extending between said first sprockets and said second sprockets, and around said corresponding one of said first circumference of the first end of said generator rotor and said first retaining ring thereof and said second circumference of the second end of said generator rotor and said second retaining ring thereof,

a second motor including a drive shaft coupled to one of said first sprockets and said second sprockets in order to pivot said one of said first sprockets and said second sprockets, thereby turning said chain and moving said docking station and said carriage assembly received therein, around said corresponding one of said first circumference of the first end of said generator rotor and said second circumference of the second end of said generator rotor.

18. The inspection system of claim 12 wherein at least one of said first motion control module and said second motion control module further comprises at least one of an encoder assembly for said transverse transport assembly, and inclinometer for said radial transport assembly;

wherein said encoder assembly is structured to determine the distance of said carriage assembly from said at least one of said first motion control module and said second motion control module, in order to determine the location of said carriage assembly within said generator; and

wherein said inclinometer is structured to determine the position of said at least one of said first motion control module and said second motion control module on said corresponding one of said first circumference of the first end of said generator rotor and said second circumference of the second end of said generator rotor.

19. The inspection system of claim 1 wherein said generator has an iron core;

wherein said electrical equipment is selected from the group consisting of cameras, ELCID coils, LEDs, motors, sensors, and transmitters; and

wherein said operation performed on said generator includes at least one of;

(a) an inspection of at least said predetermined one of said stator slots of said stator of said generator, and (b) an analysis of said iron core of said generator.

20. The inspection system of claim 1 wherein said electrical equipment includes a controlling and monitoring station;

and wherein said controlling and monitoring station is in electrical communication with said first motion control module, said second motion control module, and said carriage assembly, in order to perform said operation on said generator from a remote location.