System and Method for Managing Air Flow in a Motor

• US 20100156207A1
• Filed: 02/04/2010
• Published: 06/24/2010
• Est. Priority Date: 09/13/2004
• Status: Active Grant

• Current Assignee: Siemens Large Drives LLC
• Original Assignee: Siemens Energy & Automation Incorporated (Siemens AG)
• Inventors: Pellegrino, Brian
• Granted Patent: US 7,902,699 B2
• Time in Patent Office: Days
• US Class Current: 310/59
• CPC Class Codes: H02K 1/32 with channels or ducts for flow of cooling medium
• CPC Class Codes: H02K 17/16 having rotors with internally short-circuited windings, e.g. cage rotors
• CPC Class Codes: H02K 2205/12 Machines characterised by means for reducing windage losses or windage noise
• CPC Class Codes: H02K 5/207 with openings in the casing specially adapted for ambient air
• CPC Class Codes: H02K 9/18 wherein the external part of the closed circuit comprises a heat exchanger structurally associated with the machine casing

Abstract

Certain exemplary embodiments can comprise a system for managing air flow within an induction motor, such as in the rotor assembly of the motor. The system can comprise a gap blocker to substantially impede air flow through radial apertures defined by and/or near end regions of the rotor conductor bars.

Claims

1. A system for managing air flow within an induction motor, comprising:

a rotor assembly comprising;

a rotor shaft defining a longitudinal axis;

a plurality of longitudinally extending conductor bars, each of said conductor bars defining a first bar end region and a longitudinally opposed second bar end region; and

a first end ring adapted to be positioned concentrically with said rotor shaft, to be coupled to said conductor bars, to electrically couple said conductor bars, and to substantially impede air flow through a first plurality of radial apertures defined by said plurality of first bar end regions, said first end ring contiguous with a gap blocker, said gap blocker adapted to substantially cover radial apertures defined by gaps between conductor bar end regions and a fan of said induction motor, said gap blocker adapted to be positioned to substantially block a gap defined by said fan and a securement ring, said securement ring adapted to secure a stacked plurality of rotor laminations comprised by of said induction motor.

2. The system of claim 1, wherein said first end ring is adapted to substantially cover said first plurality of radial apertures.

3. The system of claim 1, wherein said first end ring comprises a cylindrical portion adapted to substantially cover said first plurality of radial apertures.

4. The system of claim 1, wherein said first plurality of radial apertures is defined between said first end ring and said securement ring, said securement ring located substantially adjacent a stacked plurality of laminations comprised by said rotor assembly.

5. The system of claim 1, wherein said plurality of second bar end regions define a second plurality of radial apertures.

6. The system of claim 1, further comprising a second end ring adapted to be coupled to each of said conductor bars.

7. The system of claim 1, further comprising a second end ring adapted to be coupled to said second bar end region of each of said conductor bars.

8. The system of claim 1, further comprising a second end ring adapted to substantially impede air flow through a second plurality of radial apertures defined by said plurality of second bar end regions.

9. The system of claim 1, further comprising a second end ring adapted to substantially impede air flow through a second plurality of radial apertures defined by said plurality of second bar end regions, said second end ring comprising a cylindrical portion adapted to substantially cover said second plurality of radial apertures.

10. The system of claim 1, further comprising a second end ring adapted to substantially impede air flow through a second plurality of radial apertures defined by said plurality of second bar end regions, said second end ring comprising a cylindrical portion adapted to substantially cover a shaft-side opening of each of said second plurality of radial apertures.

11. The system of claim 1, wherein said first end ring is adapted to be coupled to each of said conductor bars.

12. The system of claim 1, wherein said first end ring is adapted to be coupled to said first bar end region of each of said conductor bars.

13. The system of claim 1, wherein said securement ring is coupled to said shaft and defines a plurality of slots, each of said plurality of first bar end regions adapted to extend through a corresponding slot from the plurality of slots.

14. The system of claim 1, wherein said securement ring defines a plurality of radially distributed slots adapted to separate said plurality of first bar end regions.

15. The system of claim 1, wherein said securement ring is located adjacent a stacked plurality of laminations comprised by said rotor assembly and coupled to said shaft, said securement ring defining a plurality of radially distributed slots, each of said plurality of first bar end regions adapted to extend through a corresponding slot from the plurality of radially distributed slots.

16. The system of claim 1, further comprising a plurality of rotor core spacers adapted to extend longitudinally along said shaft.

17. The system of claim 1, further comprising a stacked plurality of laminations comprised by said rotor assembly.

18. The system of claim 1, further comprising a plurality of stator coils that define only two poles.

19. The system of claim 1, further comprising:

a stator; and

a 580 NEMA frame adapted to surround at least a portion of said stator, said stator adapted to be energized by a supply voltage of approximately 11,000 volts.

20. A method for managing air flow within an induction motor, comprising:

providing a rotor assembly comprising;

a rotor shaft defining a longitudinal axis;

a plurality of longitudinally extending conductor bars, each of said conductor bars defining a first bar end region and a longitudinally opposed second bar end region; and

coupling to said conductor bars a first end ring adapted to be positioned concentrically with said rotor shaft, to electrically couple said conductor bars, and to substantially impede air flow through a first plurality of radial apertures defined by said plurality of first bar end regions, said first end ring contiguous with a gap blocker, said gap blocker adapted to substantially cover radial apertures defined by gaps between conductor bar end regions and a fan of said induction motor, said gap blocker adapted to be positioned to substantially block a gap defined by said fan and a securement ring, said securement ring adapted to secure a stacked plurality of rotor laminations comprised by of said induction motor.