Explosion-proof motor

• US 20070159018A1
• Filed: 01/11/2006
• Published: 07/12/2007
• Est. Priority Date: 01/11/2006
• Status: Abandoned Application

• Current Assignee: Reliance Electric Technologies LLC (ABB Limited)
• Original Assignee: Reliance Electric Technologies LLC (ABB Limited)
• Inventors: Cufr, Thomas, Martin, Jerry, Grant, Barron, Crumley, Douglas
• Application Number:
  US11/329,804
• Publication Number:
  US 20070159018A1
• Time in Patent Office: Days
• US Class Current: 310/88
• CPC Class Codes: H02K 5/136 explosion-proof
• CPC Class Codes: H02K 5/15 Mounting arrangements for bearing-shields or end plates

Abstract

A novel explosion-proof motor, which, in certain embodiments, features a housing with flame paths between various joints in the housing. These flame paths may contain and cool hot gases and flames produced by a detonation within the housing. In certain embodiments, the explosion-proof motor includes a stator having a plurality of laminations and an end ring. The end ring may have a generally circumferential surface to interface with other components of the housing. The explosion-proof motor may also include an end-bracket having a second generally circumferential surface configured to mate with the end ring. The mating circumferential surfaces of the end-ring and the end-bracket may form a flame path to prevent the propagation of an internal detonation.

Claims

1. An alternating current, explosion-proof motor comprising:

a stator including a plurality of laminations and an end ring, the end ring having a first generally circumferential surface; and

an end-bracket having a second generally circumferential surface configured to mate with the first generally circumferential surface of the stator end ring to form a flame path therebetween.

2. The motor of claim 1, wherein the first generally circumferential surface is radially inside the second generally circumferential surface.

3. The motor of claim 1, wherein the end-bracket includes a bearing support for supporting a rotor of the motor.

4. The motor of claim 1, wherein the end-bracket is secured to the end ring of the stator via a plurality of bolts, and wherein at least one of the plurality of bolts is disposed within a volume formed within the end-bracket.

5. The motor of claim 1, wherein the end-bracket at least partially houses windings of the stator in within a volume formed within the end-bracket.

6. The motor of claim 1, wherein an exterior surface of the laminations has a peened finish to resist delamination during a discharge within the motor.

7. The motor of claim 1, wherein the flame path includes a sealing member.

8. The motor of claim 1, wherein the flame path comprises a surface with a generatrix that is substantially non-perpendicular to an axis of rotation of a rotor.

9. An alternating current, explosion-proof motor comprising:

a stator including a plurality of laminations and forming an external frame of the motor;

an end-ring disposed at an end of the plurality of laminations;

an end-bracket coupled to the end-ring; and

a flame path between the end-bracket and end-ring, wherein a substantial portion of the flame path comprises a first surface with a generatrix that is not generally perpendicular to an axis of rotation of a rotor.

10. The motor of claim 9, further comprising a plurality of tensile members, wherein the plurality of laminations and the end-ring form an integrated structure joined by the plurality of tensile members.

11. The motor of claim 10, wherein the first surface forms a tubular portion of the flame path.

12. The motor of claim 11, wherein the flame path is formed between a first generally circumferential surface of the end ring and a second generally circumferential surface of the end-bracket.

13. The motor of claim 12, wherein the first generally circumferential surface is radially inside the second generally circumferential surface.

14. The motor of claim 9, wherein an exterior surface of the laminations has a peened finish to resist delamination during a discharge within the motor.

15. An explosion-proof motor, comprising:

a rotor with an axis of rotation;

a frame disposed around the rotor, the frame including an extension that extends generally parallel to the axis of rotation;

an end-bracket including a mating-extension configured to mate with the extension to form a flame path therebetween.

16. The motor of claim 15, wherein the extension is generally circumferential.

17. The motor of claim 15, wherein the flame path includes a tubular portion and an annular portion.

18. The motor of claim 15, wherein the frame or the rotor includes a permanent magnet.

19. The motor of claim 15, wherein the mating-extension is disposed radially inside the extension.

20. The motor of claim 15, wherein the frame includes a winding, and wherein the end-bracket at least partially houses the winding.