STRUCTURE FOR FIXING THE CURRENT SUPPLY ASSEMBLY IN THE ROTOR OF ELECTRIC MACHINES

• US 3,639,794 A
• Filed: 04/27/1970
• Issued: 02/01/1972
• Est. Priority Date: 04/27/1970
• Status: Expired due to Term

• Current Assignee: Alexandr Abramovich Chigirinsky, Boris Leonidovich Konovalov, Boris Volkovich Spivak, David Bentsionovich Karpman, Evgeny Khaimovich Glider, Jury Vladimirovich Bednarchuk, Leonid Vasilievich Ugrjumov, Oleg Borisovich Gradov
• Original Assignee: Alexandr Abramovich Chigirinsky, Boris Leonidovich Konovalov, Boris Volkovich Spivak, David Bentsionovich Karpman, Evgeny Khaimovich Glider, Jury Vladimirovich Bednarchuk, Leonid Vasilievich Ugrjumov, Oleg Borisovich Gradov
• Inventors: Karpman, David Bentsionovich, Spivak, Boris Volkovich, Konovalov, Boris Leonidovich, Chigirinsky, Alexandr Abramovich, Glider, Evgeny Khaimovich, Gradov, Oleg Borisovich, Bednarchuk, Jury Vladimirovich, Ugrjumov, Leonid Vasilievich
• Primary Examiner(s): Duggan, D. F.
• Assistant Examiner(s): Reynolds, B. A.
• Application Number:
  US05/029,755
• Time in Patent Office: 645 Days
• Field of Search: 310/231-235,261,263,270,264,219,229
• US Class Current: 310/231
• CPC Class Codes: H01R 39/34 Connections of conductor to slip-ring
• CPC Class Codes: H02K 13/02 Connections between slip-rings and windings

Abstract

A structure for fixing the current-supply assembly in the rotor of an electric machine, such as a turbogenerator and for insuring high reliability of the current supply assembly. The device insures high mechanical strength of the supply assembly as well as satisfactory electric contact. The current-supply assembly comprises a rotor shaft whose central hole accommodates currentconducting bars; a bushing fitted on the rotor shaft and sliprings fitted on the bushing and electrically insulated therefrom; current-conducting screws making electrical connection between buses coupled to the sliprings and the current-conducting bars, said current-conducting screws and buses being also insulated from the rotor shaft and the bushing to which they are fixed with the help of keys disposed in the axial and transverse slots provided in the bushing.

Claims

1. A device for fixing the current supply assembly in a rotor of an electric machine including an excitation winding and currentconducting bars connected to the winding, said device comprising a shaft provided with slots to accommodate said excitation winding and with a central hole which encloses said currentconducting bars connected to said winding;

a bushing fitted on said shaft and sliprings arranged on said bushing and electrically insulated therefrom, conductive buses, currentconducting screws, said sliprings being connected via said conductive buses to said current-conducting bars by said currentconducting screws, said screws and said buses being insulated from the rotor shaft and the bushing, and keys on the bushing and located in axial and transverse slots provided in the bushing.

2. A device as claimed in claim 1 wherein each of said buses extend axially along said bushing, said buses being provided with a first portion which is interposed between said bushing and one of said sliprings, and also provided with a second portion which is interposed between said bushing and said shaft, said first and second portions being interconnected by a third portion in an opening provided in said bushing transversely of said shaft.

3. A device as claimed in claim 1 including a sealing gasket interposed between said shaft and each of said current conducting screws.

4. A device as claimed in claim 1 wherein said axial slot and said transverse slot communicate with one another.

5. A device as claimed in claim 4 wherein said axial and transverse slots communicating with one another are provided as two pairs of slots and are provided one pair in each of two diametrically opposite portions of said bushing.

6. A device as claimed in claim 1 wherein one of said keys is provided with a shouldered portion being vertically spaced from a projected portion provided on an adjoining key.

7. A device as claimed in claim 2 including insulation provided on said third portion of one of said buses, one of said keys axially engaging and securing said insulation on said third portion.

8. A device as claimed in claim 1 wherein said axial slot is defined by two opposingly spaced axial walls provided in said bushing, each of said axial walls being provided with an axial groove, and said transverse slot is defined by two opposingly spaced circumferential walls provided in said bushing, each of said circumferential walls being provided with a groove extending transversely of said axial grooves, at least one of said keys being provided with shoulders adapted for seating in said axial grooves, and one of said keys being provided with shoulders adapted for seating in said grooves extending transversely of said axial grooves.

9. A device as claimed in claim 1 wherein said bushing is provided with a first stop engaged by one of said keys in said axial slot, and a second stop engaged by one of said keys in said transverse slot.