Tieless bracing and method for supporting end turns of a dynamoelectric machine

• US 3,924,149 A
• Filed: 08/01/1974
• Issued: 12/02/1975
• Est. Priority Date: 08/01/1974
• Status: Expired due to Term

• Current Assignee: Luis Alberto Estrada, Warren Pierce Wielt
• Original Assignee: Luis Alberto Estrada, Warren Pierce Wielt
• Inventors: Estrada, Luis Alberto, Wielt, Warren Pierce
• Primary Examiner(s): Skudy, R.
• Application Number:
  US05/493,687
• Time in Patent Office: 488 Days
• Field of Search: 310/254,194,259,42,260,66,270,81,271,273,89,68,254,143
• US Class Current: 310/260
• CPC Class Codes: H02K 3/505 for large machine windings, e.g. bar windings H02K3/51 takes precedence

Abstract

A tieless bracing arrangement for rigidly supporting the winding end turns of a dynamoelectric machine in operating position. The tieless bracing arrangement includes a radially adjustable split metal annulus and a plurality of axially adjustable annulus positioning means. This arrangement affords axial and radial movement of the compressible annulus to lock the machine end turns in position while avoiding torsion loading of the annulus positioning structure.

Claims

1. Tieless bracing means for winding end turns of a dynamoelectric machine comprising a radially expandable and contractable split metal annulus, adjustable take-up means mounted on said annulus, said take-up means being manually adjustable to move the ends of said annulus toward one another, an elongated tongue member mounted on the inner side of one end of the split annulus and disposed to engage and underlie the inner side of the other end of the annulus when said ends are moved within one inch of one another by the take-up means, a ring of compressible felt positioned in engagement with the inner side of said annulus around substantially the entire circumference thereof, in combination with a dynamoelectric machine frame having a stator mounted therein with insulated winding end turns extending beyond the stator ends, and a plurality of axially adjustable annulus positioning means mounted on said frame at arcuately spaced-apart points radially outward from the end turns, each of said annulus positioning means comprising:

a. a threaded stud mounted on the frame with its longitudinal axis generally parallel to the stator axis, b. a pair of arms mounted in movable relation to one another on each stud adjacent the outer end thereof, said arms being operable to hold the annulus in a variety of pre-determined positions, c. clamping means mounted on each stud, said clamping means being operable to move the arms in either direction along the stud thereby to locate the annulus in a desired one of said pre-determined positions with respect to the end turns, said clamping means being further operable to force the arms associated therewith together to secure the annulus held between them in said desired position while allowing the annulus to move radially relative to the elongated studs, and dielectric means mounted on all but one of said threaded studs to insulate them respectively from the clamping means associated therewith, said one of the studs that does not mount one of the dielectric means being operable as an electrical grounding circuit between the annulus and the machine frame.

2. An invention as defined in claim 1 wherein each of said arms are steel plate stock and have annulus-receiving arcuate detents formed therein at the respective inner ends thereof, said detents being terminated in arcuate extent at a point of contact with the circumference of the annulus that is spaced at least 45 degrees from the innermost point of the annulus.

3. An invention as defined in claim 1 wherein each of said clamping means comprises:

a. a pair of threaded nuts rotatably mounted on a threaded portion of one of the studs, said nuts being positioned, respectively, on opposite sides of the pair of arms supported by the stud, b. a pair of washers disposed, respectively, between one of the nuts and the arm closest thereto, and c. manually operable means for adjusting the position of said nuts relative to one another and to the stud on which they are threaded.

4. An invention as defined in claim 3 wherein each of said dielectric means comprises:

a. an insulating bushing mounted around the stud between it and the arms associated therewith, and b. a pair of insulating washers positioned, respectively, around opposite ends of said bushing, between the respective washers of said clamping means and the arms nearest thereto.

5. An invention as defined in claim 4 wherein each of said arms is provided with an elongated aperture through which its associated stud is pOsitioned, the longitudinal axis of said aperture being disposed normal to said annulus, thereby to allow the arms to be moved radially with respect to said annulus without moving said stud.