Rotor shaft with integral wedge retainers for core of a two-pole generator

• US 5,325,009 A
• Filed: 05/07/1993
• Issued: 06/28/1994
• Est. Priority Date: 05/07/1993
• Status: Expired due to Fees

• Current Assignee: Sundstrand Corporation (Rtx Corporation)
• Original Assignee: Sundstrand Corporation (Rtx Corporation)
• Inventors: Thomas, Lee L., Capion, Robert L.
• Primary Examiner(s): Skudy, R.
• Application Number:
  US08/058,694
• Time in Patent Office: 417 Days
• Field of Search: 310/261, 310/262, 310/216, 310/263, 310/264, 310/265, 310/42, 310/179, 310/180, 310/208, 310/91, 29/598
• US Class Current: 310/216.122
• CPC Class Codes: H02K 1/24 Rotor cores with salient poles ; Variable reluctance rotors
• CPC Class Codes: H02K 1/28 Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures

Abstract

A two-pole generator rotor assembly (100) including a core (120) and a shaft for mounting the core (120). The shaft includes a pair of shaft end portions (117, 119), with each of the shaft end portions (117, 119) including an integrally formed axially extending retaining wedge portion (134) adapted to mount and retain the core (120) in the rotor assembly (100). The wedge retaining portions (134) include opposed surface portions arranged so as to define therebetween a slot for accommodating the core (120) when the shaft end portions (117, 119) are assembled so that the core (120) and shaft end portions (117, 119) form a rotor subassembly. An outer containment (114) is shrink fitted on the rotor subassembly. A tongue and groove connection (38a, 39) is provided between the respective retaining wedge portions (134) and associated shaft end portions (117, 119) so as to interlock the two end shaft portions (117, 119) together.

Claims

1. A two-pole generator rotor assembly comprising core means, and a shaft means for mounting said core means, said shaft means including a first and a second shaft end portion, each of said shaft end portions including an integrally formed axially extending wedge means adapted to mount the core means in the rotor assembly, and wherein said wedge means include opposed faces arranged so as to define therebetween a slot means for accommodating said core means when said shaft end portions are assembled whereby said core means and said shaft means form a rotor subassembly, and wherein means are provided on at least free end portions of the wedge means for connection the wedge means to the shaft end portions

2. A two-pole generator rotor assembly according to claim 1, wherein means surrounding the rotor subassembly form an outer containment thereof.

3. A two-pole generator rotor assembly according to claim 2, wherein, said means surrounding includes a substantially cylindrical sleeve of a high strength material axially slidable over the rotor subassembly.

4. A two-pole generator rotor assembly according to claim 3, wherein said sleeve is shrink fitted on said rotor subassembly.

5. A two-pole generator rotor assembly according to claim 4, wherein a plurality of prewound field coil windings are accommodated on said core means, and wherein said opposed faces define with portions of said core means a means accommodating the plurality of prewound field coil windings.

6. A two-pole generator rotor assembly according to claim 5, wherein each of said wedge means terminate in a free end portion, the free end portion of the wedge means integrally formed with said first shaft end portion being adapted to be brought into engagement with a portion of the second shaft end portion, and the free end portion of the wedge means integrally formed with said second shaft end portion being adapted to be brought into engagement with a portion of said first shaft end portion when said first and said second shaft end portions are assembled.

7. A two-pole generator rotor assembly according to claim 1, wherein a plurality of prewound field coil windings are accommodated on said core means, and wherein said opposed faces define with portions of said core means, a means accommodating the plurality of field coil windings.

8. A two-pole generator rotor assembly according to claim 7, wherein each of said wedge terminate in a free end portion, the free end portion of the wedge means integrally formed with said first shaft end portion being adapted to be brought into engagement with a portion of the second shaft end portion, and the free end portion of the wedge means integrally formed with said second shaft end portion being adapted to be brought into engagement with a portion of said first shaft end portion when said first and said second shaft end portions are assembled.

9. A two-pole generator rotor assembly according to claim 1, wherein said wedge means integrally formed on the first shaft end portion includes means for connecting a free end portion thereof to the second shaft end portion, and wherein said wedge means integrally formed on the second shaft end portion includes means for connecting a free end portion thereof to the first shaft end portion so as to interlock the first and the second shaft end portions together.

10. A two-pole generator rotor assembly according to claim 9, wherein said means for connecting the first and the second shaft end portions together includes a tongue and groove connection between the wedge means of the first shaft end portion and the second shaft end portion, and between the wedge means of the second shaft end portion and the first shaft end portion.

11. A two-pole generator rotor assembly comprising core means, and a shaft means for mounting said core means, said shaft means including a first and a second shaft end portion, each of said shaft end portions including an integrally formed axially extending wedge means adapted to mount the core means in the rotor assembly, and wherein said wedge means include opposed faces arranged so as to define therebetween a slot means for accommodating said core means when said shaft end portions are assembled whereby said core means and said shaft means form a rotor subassembly, and wherein means surrounding the rotor subassembly form an outer containment thereof, and wherein said means surrounding includes a substantially cylindrical sleeve of a high strength material axially slidable over the rotor subassembly, and wherein said sleeve is shrink fitted on said rotor subassembly, and wherein a prewound field coil winding is accommodated on said core means, and wherein said opposed faces define with portions of said core means a means accommodating a plurality of field coil windings, and wherein each of said wedge means terminate in a free end portion, the free end portion of the wedge means integrally formed with said first shaft end portion being adapted to be brought into engagement with a portion of the second shaft end portion, and the free end portion of the wedge means integrally formed with said second shaft end portion being adapted to be brought into engagement with a portion of said first shaft end portion when said first and said second shaft end portions are assembled, and wherein means are provided on at least said free end portions of the wedge means for connecting the wedge means to the shaft end portions, and wherein said means for connecting the wedge means to the shaft end portions includes axially extending projection means provided on said free end portions for engagement with corresponding notch means provided on the shaft end portions to connect the wedge means to the shaft end portions.

12. A two-pole generator rotor assembly according to claim 11, wherein said shaft end portions engageable with the free end portions of the wedge means include annular collars integrally formed with the shaft end portions.

13. A two-pole generator rotor assembly according to claim 12, wherein means are provided on each of said opposed faces of said wedge means for mounting said field coil winding at said core means.

14. A two-pole generator rotor assembly according to claim 13, wherein said means for mounting includes a plurality of spaced axially extending flange means defining spaced slots for accommodating the field coil winding.

15. A two-pole generator rotor assembly according to claim 14, wherein coil winding end turn support means are provided at opposite axial ends of the core means and are disposed between the opposite axial ends and one of the annular collars of the shaft end portions.

16. A two-pole generator rotor assembly according to claim 15, wherein means are provided for preventing axial movement of the shaft end portions when the shaft end portions are assembled.

17. A two-pole generator rotor assembly according to claim 16, wherein said means for preventing axial movement includes at least one locating pin means adapted to be inserted in a direction substantially transverse to a longitudinal direction of the rotor subassembly.