High voltage generator stator with radially inserted cable windings and assembly method

• US 6,278,217 B1
• Filed: 12/09/1999
• Issued: 08/21/2001
• Est. Priority Date: 12/09/1999
• Status: Expired due to Term

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Shah, Manoj R., Kliman, Gerald B.
• Primary Examiner(s): Ramirez, Nestor
• Assistant Examiner(s): LE, DANG D
• Application Number:
  US09/457,480
• Time in Patent Office: 621 Days
• Field of Search: 310/52, 310/54, 310/57, 310/58, 310/60.A, 310/64, 310/65, 310/179, 310/196, 310/216, 310/254, 310/258, 310/259
• US Class Current: 310/254.1
• CPC Class Codes: H02K 15/085 by laying conductors into slotted stators
• CPC Class Codes: H02K 2203/15 Machines characterised by cable windings, e.g. high-voltage cables, ribbon cables
• CPC Class Codes: H02K 3/48 in slots
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine
• CPC Class Codes: Y10T 29/49073 by assembling coil and core

Abstract

A stator for a high voltage generator has cable windings that are radially inserted into the stator slots. The stator is assembled as the cable windings are laid into the stator slots. The stator slots are left wide open to allow the cable windings and separator bars to be inserted in the slot as the stator is assembled. The open slots have sidewalls that are defined by stator teeth, which extend radially out from a rotor jig in the stator. As each coil section is laid in a slot, a separator bar is inserted over the coil so that another coil section can be laid into the stator. The coils are stacked in a slot and sandwiched between separator bars also in the slot. The separator bar is keyed to the sidewalls of the teeth to provide structural support for the cable windings.

Claims

1. A stator for a dynamo electrical machine comprising:

a circular array of stator sidewalls extending radially outward from a rotor opening, stator teeth with key segments alternating along the radial length of said sidewalls, and stator slots defined between opposite sidewalls;

separator bars in said stator slots and extending longitudinally along said stator, said separator bars engaged with the opposite sidewalls of the teeth, wherein a plurality of separator bars are stacked in a stator slot, and

cable windings seated between adjacent separator bars in the stator slots.

2. A stator as in claim 1 further comprising an intra-cable space between said cable and at least one of said opposite sidewalls.

3. A stator as in claim 2 wherein the intra-cable space is a cooling fluid conduit.

4. A stator as in claim 2 wherein said separator bars comprise plastic.

5. A stator as in claim 2 wherein said separator bars comprise a magnetic material, and include a gap extending axially through each bar.

6. A stator as in claim 5 wherein said separator bars comprise a powdered metal.

7. A stator as in claim 1 wherein said separator bars have longitudinal channels on an upper or lower separator bar surface to seat said cable windings.

8. A stator as in claim 1 wherein said separator bars have edges with a key segment that slidably engage opposite key segments in opposite sidewalls of the teeth.

9. A stator as in claim 1 wherein said teeth have upper edges having a top key segment that slidably engage opposite yoke key segments in a yoke.

10. A stator as in claim 1 wherein the cable windings have an insulation sheath that gradually increases in thickness, and the cable windings in the stator slot and near the rotor opening have an insulation sheath that is thinner than that of the cable windings near an opposite end of the slot.

11. A stator as in claim 1 having a yoke slidably mounted on said teeth.

12. A stator as in claim 1 having a yoke formed of azimuthly oriented silicon steel.

13. A stator as in claim 12 wherein said teeth are formed of radially oriented silicon steel.