COIL END SUPPORT

• US 3,558,950 A
• Filed: 07/11/1968
• Issued: 01/26/1971
• Est. Priority Date: 07/11/1968
• Status: Expired due to Term

• Current Assignee: George M. Raybould
• Original Assignee: George M. Raybould
• Inventors: Raybould, George M.
• Application Number:
  US04/744,167
• Time in Patent Office: 929 Days
• US Class Current: 310/270
• CPC Class Codes: H02K 3/51 applicable to rotors only
• CPC Class Codes: H02K 7/04 Balancing means

Abstract

The disclosure relates to a dynamoelectric machine having a winding on a rotor with the coil end turns of the winding supported and secured to a ring of insulation material. The ring is made from resin impregnated tape or roving and has a cylindrical collar and two stiffening flanges disposed in a Ushape in radial cross section. The coil end turns are secured to this ring by banding tape on the outer periphery of the coil end turns and this constitutes the only support of the ring so that the ring is free floating and can move axially with changing temperatures of the coil end turns and also this free floating support permits a maximum air passage between the ring and the machine shaft for maximum cooling.

Claims

1. A coil end turn support and balancing ring assembly for the rotor winding of a dynamoelectric machine, comprising in combination:

a ring substantially entirely of insulating material, and having an outer peripheral face;

said ring being established radially inside the coil end turns of the windings of the rotor and in engagement with the inner surface of the coil end turns;

means securing the coil end turns to said ring constituting the only support for said ring to permit the ring to move axially relative to the rotor upon expansion of the coil end turns due to heating during use;

a generally cylindrical collar on said ring on which the outer peripheral face is located;

flange means extending generally radially inwardly from said collar;

an inner peripheral face on said collar;

a roughened surface on said inner peripheral face; and

a balance weight secured to said ring to dynamically balance said rotor and interlocking with said roughened surface to help secure the weight in circumferential position.

2. An assembly as set forth in claim 1, wherein said balance weight is secured to the flange means of the ring.

3. An assembly as set forth in claim 1, including first and second flanges in said flange means and wherein said weight is disposed between and in engagement with said first and second flanges.

4. An assembly as set forth in claim 1, wherein said securing means is a band of resin impregnated tape or roving circumscribing the coil end turns in the plane of said ring.

5. An assembly as set forth in claim 1 including:

said means securing the coil end turns being the only support for said ring;

said roughened surface including a metal screen on the inner peripheral face of said collar; and

said weight being solidified from the molten state to lock into the interstices of the metal screen to secure the weight in circumferential and radial directions.