Very high current field winding for dynamoelectric machine rotor

• US 3,894,253 A
• Filed: 10/25/1973
• Issued: 07/08/1975
• Est. Priority Date: 10/25/1973
• Status: Expired due to Term

• Current Assignee: David M. Willyoung
• Original Assignee: David M. Willyoung
• Inventors: Willyoung, David M.
• Primary Examiner(s): Skudy, R.
• Application Number:
  US05/409,651
• Time in Patent Office: 621 Days
• Field of Search: 310/52,53,54,55,58,59,60,61,51,64,65,179,185,187,201,192,208,194,195,214-218 73/118
• US Class Current: 310/61
• CPC Class Codes: H02K 13/02 Connections between slip-rings and windings
• CPC Class Codes: H02K 3/51 applicable to rotors only
• CPC Class Codes: H02K 9/00 Arrangements for cooling or ventilating channels or ducts in parts of the magnetic circuit H02K1/20, H02K1/32; channels or ducts in or between conductors H02K3/22, H02K3/24

Abstract

An arrangement for a dynamoelectric machine rotor with a very high current winding employing only one or two conductors per slot. The slot windings are held by insulated dovetails and extend to the rotor surface to be cooled by convection. Excitation current from the connection bars in the rotor bore hole is fed through a plurality of radial studs to the outer coils of the concentrically wound field winding. Connection between the opposite pole windings is made by a fluid-cooled connection between the inner coil terminating conductors.

Claims

1. A field winding for a two pole dynamoelectric machine rotor of the type having a body portion formed with axially extending insulated slots and a reduced spindle portion at either end thereof comprising:

a. at least one electrical conductor bar disposed in each axially extending rotor body insulated slot;

each slot defined by a pair of radially extending arms and each arm terminating in an enlarged retaining lip portion;

each electrical conductor extending radially outward from within its respective slot approximately to the rotor surface;

b. an inner coil terminating conductor for each rotor pole;

c. an outer coil terminating conductor for each rotor pole;

said inner and outer coil terminating conductors electrically connected to said rotor body conductor bars;

d. a pole to pole connector electrically connecting said inner coil terminating conductors;

e. a plurality of terminal studs connected to a negative and positive source of excitation current; and

, f. a plurality of electrical leads connecting the terminal studs to outer coil terminations, said terminal studs and said electrical leads each are arranged with communicating internal cooling passages and having a coolant inlet on each terminal stud disposed closer to the rotor spindle than a coolant outlet from said lead.

2. The rotor winding according to claim 1, wherEin said pole-to-pole connector comprises a diametral stud member extending through said spindle from one side to the other and having cooling passages arranged to circulate gas coolant through said member.

3. The rotor winding according to claim 2, wherein said gas cooling passages comprise at least two parallel channels through the diametral stud member, each arranged with an inlet closer to the rotor spindle than its outlet to provide a self-pumping coolant counterflow.

4. The rotor winding according to claim 1, wherein said terminal studs are arranged in at least two circumferential rings around the spindle and axially offset from one another.

5. The rotor winding recited in claim 1 wherein each slot lying electrical conductor extends radially outward beyond the rotor surface and terminates in an enlarged flange portion beyond the rotor slot retaining lips.

6. The rotor winding recited in claim 1 wherein each slot lying electrical conductor comprises two mating halves electrically insulated from one another and each occupying the same radial position at a given axial position.