CASTABLE ROTOR HAVING RADIALLY VENTING LAMINATIONS

• US 3,684,906 A
• Filed: 03/26/1971
• Issued: 08/15/1972
• Est. Priority Date: 03/26/1971
• Status: Expired due to Term

• Current Assignee: Henry George Lenz
• Original Assignee: Henry George Lenz
• Inventors: Lenz, Henry George
• Primary Examiner(s): Sliney, D. X.
• Application Number:
  US05/128,393
• Time in Patent Office: 508 Days
• Field of Search: 310/61,64,65,212
• US Class Current: 310/61
• 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

Abstract

A rotor is described having ventilating laminations of a configuration permitting casting of the rotor conductors without blocking radially venting passages in the rotor. To effect this result, the triple cage conductor slot configuration of the main rotor laminations is altered in the venting laminations to a coffin shaped slot of equal area thereby providing a greater span between conductor slots for venting slots extending radially between, and separated from, the coffin shaped conductor slots. A kidney shaped manifold serves to communicate the venting slots with circular refrigerant passageways extending laterally through the rotor while a second group of ventilating laminations having radially disposed venting slots partially overlapping the venting slots of the first ventilating laminations permits radial discharge of refrigerant into the rotor air gap.

Claims

1. A rotor for a dynamoelectric machine comprising an axial shaft, a plurality of magnetic laminations stacked upon said shaft, said magnetic laminations having arcuately spaced slots along the periphery of said lamination to receive axially extending conductors therein, and venting means disposed along the axial length of said rotor to permit flow of coolant through said rotor, said venting means being characterized by an axial channel extending through said rotor laminations at a location radially interior of said conductor slots and at least one magnetic lamination having venting slots in communication with said axial channel, said venting slots extending radially between and being physically separated from the conductor slots within the venting lamination, said venting slots in said venting lamination terminating short of the periphery of said rotor, said venting lamination being juxtaposed with a second venting lamination having venting passages extending radially between and being physically separated from the conductor slots within said second venting lamination, said venting passages in said second venting lamination being radially displaced relative to the venting passages in the first venting lamination by an amount to partially overlap the venting passages in said first venting lamination.

2. A rotor for dynamoelectric machine according to Claim 1 wherein the geometric configuration of said conductor slots in the venting laminations differs from the geometric configuration of the conductor slots in the non-venting laminations forming the rotor to provide a greater span of magnetic material between adjacent slots of the venting laminations relative to the span of magnetic material adjacent the conductor slots in the non-venting laminations.

3. A rotor for a dynamoelectric machine according to claim 2 wherein the cross-sectional area of the conductor slots in the venting laminations is equal to the cross-sectional area of the conductor slots in the non-venting laminations.

4. In a rotor for a dynamoelectric machine characterized by an axial shaft, a plurality of main magnetic laminations stacked upon said shaft, each of said main magnetic laminations having arcuately displaced slots disposed along the periphery of said laminations to receive axially extending conductors therein, and ventilating laminations situated along the axial length of said rotor for passage of a coolant therethrough, the improvement comprising ventilating laminations characterized by conductor slots in axial registration with the conductor slots in said main rotor laminations, the cross-sectional area of said conductor slots in said ventilating laminations being equal in cross-sectional area to the conductoR slots in the main rotor laminations, said main rotor conductor slots having a geometric configuration differing from the geometrical configuration of said conductor slots in said ventilating laminations to provide a greater span of magnetic material between adjacent slots of said ventilating laminations relative to the span of magnetic material between adjacent conductor slots in said main rotor laminations, and venting passages extending between and being physically separated from the conductor slots in said ventilating laminations.

5. A rotor for a dynamoelectric machine according to claim 4 wherein the radial height of said conductor slots in said ventilating laminations is equal to the height of the slots in said main rotor laminations.

6. A rotor for a dynamoelectric machine according to claim 5 wherein the conductor slots in said ventilating laminations and said main rotor laminations have triangularly shaped peripheral regions of identical geometric configuration, the edges of said triangularly shaped regions being axially aligned within said rotor.

7. A rotor for a dynamoelectric machine according to claim 4 wherein the venting passage in said ventilating laminations terminate short of the periphery of said rotor, said ventilating laminations being juxtaposed with second ventilating laminations having venting passages extending radially between and separated from the conductor slots within said second ventilating laminations, said venting passages in said second ventilating laminations being radially displaced relative to said venting passages in said first ventilating laminations by an amount to partially overlap the venting passages in said first ventilating laminations.

8. A rotor for a dynamoelectric machine according to claim 7 wherein said conductor slots in said main rotor lamination are triple cage slots and said conductor slots in said ventilating laminations are coffin shaped slots.

9. In a rotor of dynamoelectric machine characterized by an axial shaft, a plurality of main magnetic laminations stacked upon said shaft, each of said main magnetic laminations having arcuately displaced slots disposed along the periphery of said laminations to receive axially extending conductors therein, and ventilating laminations situated along the axial length of said rotor for passage of a coolant therethrough, the improvement comprising ventilating laminations characterized by conductor slots in axial registration with the conductor slots in said main rotor laminations, the conductor slots in the main rotor laminations having a geometric configuration differing from the geometric configuration of said conductor slots in said ventilating laminations to provide a greater span of magnetic material between adjacent slots in said ventilating laminations relative to the span of magnetic material between adjacent conductor slots in the main rotor laminations, venting passages extending between and being physically separated from the conductor slots in said ventilating laminations, at least one axial passage extending through said stacked main magnetic laminations to permit passage of refrigerant from the ends of said rotor to said venting passages, arcuately elongated manifolds interconnecting groups of said venting passages with said axial passage to permit a single axial passage having a relatively short arcuate span to feed refrigerant to a group of venting passages extending over a greater arcuate span, the arcuately elongated manifolds in ventilating laminations on one axial side of the rotor being arcuately displaced relative to the arcuately elongated manifolds in ventilating laminations on the other side of the rotor to feed refrigerant to arcuately displaced groups of venting passages.

10. A rotor for dynamoelectric machine according to claim 9 wherein said venting passages in the ventilating laminations terminate short of the periphery of said rotor and said ventilating laminations are juxtaposed with a second ventilating lamination having venting passages extenDing radially between and being physically separated from the conductor slots within said second ventilating lamination, said venting passages in said second ventilating lamination being radially displaced relative to the venting passages in the first ventilating lamination by an amount to partially overlap the venting passages in said first ventilating lamination.

11. A rotor for a dynamoelectric machine according to claim 10 wherein said axial passage extends completely through said rotor, a portion of the arcuately displaced manifolds on axially opposite sides of said rotor lying within the plane of said axial passage.