Rotor with non-cylindrical surface for dynamoelectric machine

Patent metadata

Field	Value
Publication number	US-9509183-B2
Application number	US-201313946698-A
Country	US
Kind code	B2
Filing date	Jul 19, 2013
Priority date	Jul 19, 2013
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

Various embodiments include apparatuses adapted to include a dynamoelectric machine rotor with a modified outer surface. In some embodiments apparatuses include a dynamoelectric machine rotor including a rotor body having a spindle, pole regions, the pole regions having a non-uniform radial distance from an axis of rotation of the rotor to an outer surface of the pole regions and a plurality of slots in the outer surface of the rotor body, the plurality of slots being spaced apart in a circumferential direction of the rotor body, each of the plurality of slots extending in an axial direction of the rotor body.

First claim

What is claimed is:

1. A dynamoelectric machine rotor comprising:
a rotor body including:
a spindle;
pole regions, each pole region having a non-uniform radial distance from an axis of rotation of the rotor to an outer surface of the pole regions, wherein the pole regions each include a single flat radially-facing outer surface; and
a plurality of slots in the outer surface of the rotor body, the plurality of slots being spaced apart in a circumferential direction of the rotor body, each of the plurality of slots extending in an axial direction of the rotor body.

2. The rotor of claim 1 , wherein the rotor is a two-pole rotor.

3. The rotor of claim 1 , wherein, when in use within the dynamoelectric machine, a radial distance between an inner stator surface of the dynamoelectric machine and the outer surface of the pole regions is non-uniform.

4. The rotor of claim 1 , wherein the pole regions each include a plurality of adjacent flat outer surfaces.

5. The rotor of claim 1 , wherein the pole regions each include a convex outer surface.

6. The rotor of claim 1 , wherein the plurality of slots are shaped to accept excitation windings.

7. The rotor of claim 1 , wherein the single flat radially-facing outer surface is located at each pole region, between a first circumferential end and a second circumferential end thereof.

8. A dynamoelectric machine comprising:
a stator;
a rotor positioned within the stator, the rotor including a rotor body having:
a spindle;
pole regions having a non-uniform radial distance from an axis of rotation of the rotor to an outer surface of the pole regions, wherein the pole regions each include a single flat radially-facing outer surface; and
a plurality of slots in an outer surface of the rotor body, the plurality of slots being spaced apart in a circumferential direction of the rotor body, the plurality of slots extending in an axial direction of the rotor body.

9. The dynamoelectric machine of claim 8 , wherein the rotor is a two-pole rotor.

10. The dynamoelectric machine of claim 8 , wherein a radial distance between the inner stator surface and the outer surface of the pole regions is non-uniform.

11. The dynamoelectric machine of claim 8 , wherein the pole regions each include a single flat surface.

12. The dynamoelectric machine of claim 8 , wherein the pole regions each include an outer convex surface.

13. The dynamoelectric machine of claim 8 , wherein the plurality of slots are shaped to accept excitation windings.

14. The dynamoelectric machine of claim 13 , further comprising excitation windings,
wherein during operation of the dynamoelectric machine, a field current is applied to the excitation windings, producing a rated voltage under an open circuit condition at the stator;
wherein a field current is applied to the excitation windings, producing a rated current under a short circuit condition at the stator; and
wherein the dynamoelectric machine has a short circuit ratio defined by a value of the field current applied to produce rated voltage under open circuit condition divided by a value of the field current to produce rated current under short circuit condition;
wherein the non-uniform radial distance increases the short circuit ratio in the dynamoelectric machine.

15. The dynamoelectric machine of claim 8 , wherein an inner surface of the stator is cylindrical and has a circular cross section.

16. The dynamoelectric machine of claim 8 , wherein the single flat radially-facing outer surface is located at each pole region, between a first circumferential end and a second circumferential end thereof.

17. A dynamoelectric machine comprising:
a stator; and
a rotor positioned within the stator, the rotor having an oblate cylindrical cross-section including, a first curve having a first radius and a second curve having a second radius, the first radius being orthogonal to the second radius, the first radius and the second radius having different lengths, the rotor including a rotor body having:
a spindle;
pole regions having a non-uniform radial distance from an axis of rotation of the rotor to an outer surface of the pole regions, wherein the pole regions each include a single flat radially-facing outer surface; and
a plurality of slots in an outer surface of the rotor body, the plurality of slots being spaced apart in a circumferential direction of the rotor body, the plurality of slots extending in an axial direction of the rotor body, and the plurality of slots being shaped to accept excitation windings.

18. The dynamoelectric machine of claim 17 , wherein an inner surface of the stator is cylindrical and has a circular cross section.

19. The dynamoelectric machine of claim 17 , further comprising excitation windings within the slots,
wherein during operation of the dynamoelectric machine, a field current is applied to the excitation windings, producing a rated voltage under an open circuit condition at the stator;
wherein a field current is applied to the excitation windings, producing a rated current under a short circuit condition at the stator; and
wherein the dynamoelectric machine has a short circuit ratio defined by a value of the field current applied to produce rated voltage under open circuit condition divided by a value of the field current to produce rated current under short circuit condition;
wherein the non-uniform radial distance increases the short circuit ratio in the dynamoelectric machine.

20. The dynamoelectric machine of claim 17 , wherein the single flat radially-facing outer surface is located at a circumferential midpoint of each of the pole regions.

Assignees

• Gen Electric

Inventors

• Devarakonda Venkata Subramanya Sarma
• Davis Patrick Robert
• Grant James Jonathan
• Quail Paul August
• Yagielski John Russell

Classifications

• H02K3/12

  arranged in slots · CPC title

• H02K2201/03

  Machines characterised by aspects of the air-gap between rotor and stator · CPC title

• H02K19/00

  Synchronous motors or generators (having permanent magnets H02K21/00) · CPC title

• H02K29/03

  with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems · CPC title

• H02K1/246

  Variable reluctance rotors · CPC title