Method of making dynamoelectric machine rotor having cast conductors and radial coolant ducts

• US 4,395,816 A
• Filed: 02/11/1982
• Issued: 08/02/1983
• Est. Priority Date: 06/09/1980
• Status: Expired due to Term

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Pangburn, William W.
• Primary Examiner(s): Hall, Carl E.
• Application Number:
  US06/347,835
• Time in Patent Office: 537 Days
• Field of Search: 29/598, 310/61, 310/64, 310/65, 310/211, 310/212, 164/109, 164/110, 164/DIG. 10 X
• US Class Current: 29/598
• CPC Class Codes: H02K 1/32 with channels or ducts for flow of cooling medium
• CPC Class Codes: H02K 15/0012 Manufacturing cage rotors
• CPC Class Codes: H02K 17/16 having rotors with internally short-circuited windings, e.g. cage rotors
• CPC Class Codes: Y10S 164/10 Rotor
• CPC Class Codes: Y10T 29/49012 Rotor

Abstract

A rotor comprising stacked laminations having conductor slots and axial passageways provided with closed-slot spacer assemblies that are stacked in groups between selected axially spaced rotor laminations to hold said laminations apart while sealing the conductor slots thereby to form radial cooling ducts through the laminations of the selected axially spaced groups and around the closed-slot spacer assemblies. According to the method of the invention, the spacer assemblies are secured in selected operating position by being staked to certain of the main rotor laminations, and a characteristic staking procedure is used to secure individual plates of each of the assemblies together.

Claims

1. A method for making a laminated rotor having axially-extending passageways for receiving therein cast conductors positioned adjacent the peripheral surface of the stacked rotor laminations and having radial coolant ducts extending between spaced groups of the rotor laminations, comprising the steps of:

(a) providing a first plurality of rotor laminations each having a plurality of conductor apertures and a plurality of coolant apertures,

(b) providing a second plurality of rotor laminations each substantially identical to the laminations in said first plurality except that each lamination in said second plurality includes a plurality of pairs of additional apertures, each said pair of additional apertures being positioned, respectively, adjacent one of said conductor apertures,

(c) stacking the first plurality of rotor laminations in groups and stacking one lamination from said second plurality of rotor laminations on one end of each group, thereby to align the conductor apertures in all of the rotor laminations of each group to define conductor passageways extending axially through each of said groups,

(d) providing a plurality of laminated spacer assemblies each having a conductor-receiving passageway therethrough, and each having two bosses on one surface of a first outer plate lamination thereof, each of said bosses being arranged to fit, respectively, into an aperture of a respective pair of said additional apertures in one of said second plurality of rotor laminations,

(e) stacking the groups of rotor laminations and the spacer assemblies to position a spacer assembly conductor-receiving passageway in alignment with each conductor pasageway in an adjacent group of rotor laminations and to position the spacer assemblies between said groups of rotor laminations whereby the conductor passageways are sealed from radial coolant ducts that extend from the axial coolant passageways defined by the coolant apertures in the rotor laminations to the periphery of the rotor between said groups of rotor laminations,

(f) securing the stacked groups of rotor laminations and spacer assemblies in said aligned relationship, and casting conductors in each of said conductor passageways.

2. A method as defined in claim 1 including the step of:

(b-1) forming each of said pairs of additional apertures in the second plurality of rotor laminations so that the apertures in each pair are spaced from each other and are substantially aligned with a radius of the rotor laminations and are spaced radially inward from one of said conductor apertures.

3. A method as defined in claim 2 including the step of:

(d-1) forming a pair of spaced apertures in each of said first outer plate laminations of each spacer assembly, and forming spaced bosses on each of the other plate laminations in each spacer assembly, each pair of said bosses being spaced apart a distance about equal to the distance between the pair of spaced apertures in said first outer plate lamination of each spacer assembly, and each of said spaced bosses being positioned in alignment, respectively, with one of the apertures in the first outer plate lamination of its spacer assembly.

4. A method as defined in claim 3 including the step of:

(c-2) forming a pair of spaced apertures in each of the other outer plate laminations of each spacer assembly, said pair of apertures in each of said other outer plate laminations being spaced apart a distance substantially equal to the distance between the bosses in the first outer plate lamination in its spacer assembly and arranged generally in alignment respectively, therewith.

5. A method of making a laminated rotor for a dynamo-electric machine comprising the steps of:

(a) providing a plurality of substantially identical rotor laminations each having a plurality of arcuately spaced conductor apertures adjacent its periphery, a central bore aperture, a plurality of coolant apertures arcuately spaced around the bore aperture and an additional pair of spaced apertures each positioned, respectively, radially inwardly from each of the conductor apertures,

(b) providing a plurality of laminated spacer assemblies each having a conductor-receiving passageway through it and each having two spaced bosses formed on an outer surface thereof,

(c) stacking the main rotor laminations in groups with a plurality of said spacer assemblies stacked between adjacent groups of main rotor laminations so that each of the bosses on the spacer assemblies is positioned to fit, respectively, into one of said apertures of the respective pairs of additional apertures formed in the adjacent main rotor lamination closest to the side of said spacer assembly having said bosses thereon,

(d) compressing the groups of main rotor laminations and the plurality of spacer assemblies together to secure the laminated plates of each spacer assembly to one another and to secure the bosses on each spacer assembly into the main rotor lamination apertures juxtaposed therewith, and

(e) casting a plurality of conductors, respectively, in each of the conductor-receiving passageways defined by aligned conductor apertures in the respective groups of main rotor laminations and plurality of spacer assemblies, thereby to fix said groups of rotor laminations and spacer assemblies in rigid operating position relative to one another.