US4947539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing rotor assembly structure
Assignee: Emerson Electric Co
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Filing: 1989-04-24
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Granted: 1990-08-14
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Expires: 2009-04-24
Abstract
Abstract A method and apparatus for making a rotor assembly for an electric motor wherein the rotor core of the assembly includes a stack of annular laminations having fixed molded annular end rings on opposed faces thereof with a rotor shaft extending through the core and fixed thereto by a molded rotor hub shaped in cup-like fashion at one end thereof to cooperate in forming an oil return member therewith.
Inventors
- 👤 David F. Aussieker
- 👤 Gerald N. Baker
- 👤 Ray E. Bushor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:52
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/04; H02K5/16; H02K5/167; H02K5/1675; H02K1/00; H02K1/06; H02K1/22; H02K1/28; H02K15/00; H02K15/02; H02K15/028; Y; Y10; Y10S; Y10S164/00; Y10S164/10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49012
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
258 words
A method of manufacturing a rotor assembly for an electric motor, said rotor assembly having a central longitudinal axis of rotation about which said assembly is rotated when installed in said motor; said assembly including a rotor core having a stack of annular laminations of suitable ferro-magnetic materials with the inner peripheral wall formed by said stack of annular laminations defining a central opening therethrough about said central longitudinal axis, a rotor shaft extending along said central longitudinal axis, a rotor hub between said core and shaft and an oil return tube extending coaxially with said central longitudinal axis comprising the steps of: forming said rotor core by molding a pair of annular end rings along opposed faces of said stack of annular laminations; inserting a rotor shaft through the central opening defined by said stack of annular laminations and supporting the shaft in concentrically spaced relation from said inner peripheral wall of said stack of annular laminations so that the longitudinal axis of said shaft extends along said central axis of rotation; molding a rotor hub between said inner peripheral wall of said stack of annular laminations and said concentrically supported rotor shaft to fix said rotor core to said rotor shaft, said rotor hub being so molded to include a cup-like opening at one end thereof and including the simultaneous molding of a concentric, axially extending mouth portion integral with said rotor hub, said mouth portion extending axially beyond said rotor core and said rotor hub and forming said oil return tube for said rotor assembly.
Claim 2
Independent Claim
258 words
A method of manufacturing a rotor assembly for an electric motor, said rotor assembly having a central longitudinal axis of rotation about which said assembly is rotated when installed in said motor; said assembly including a rotor core having a stack of annular laminations of suitable ferro-magnetic materials with the inner peripheral wall formed by said stack of annular laminations defining a central opening therethrough about said central longitudinal axis, a rotor shaft extending along said central longitudinal axis, a rotor hub between said core and shaft and an oil return tube extending coaxially with said central longitudinal axis comprising the steps of: forming said rotor core by molding a pair of annular end rings along opposed faces of said stack of annular laminations; inserting a rotor shaft through the central opening defined by said stack of annular laminations and supporting the shaft in concentrically spaced relation from said inner peripheral wall of said stack of annular laminations so that the longitudinal axis of said shaft extends along said central axis of rotation; molding a rotor hub between said inner peripheral wall of said stack of annular laminations and said concentrically supported rotor shaft to fix said rotor core to said rotor shaft, said rotor hub being so molded to include a cup-like opening at one end thereof and including the simultaneous molding of a concentric, axially extending mouth portion integral with said rotor hub, said mouth portion extending axially beyond said rotor core and said rotor hub and forming said oil return tube for said rotor assembly.
Claim 3
Dependent Claim
24 words
The method of manufacturing a rotor assembly of claim 1, the step of molding the rotor hub including die casting with a zinc material.
Claim 4
Dependent Claim
23 words
The method of manufacturing a rotor assembly of claim 1, the step of molding the rotor hub with a high modulus plastic material.
Claim 5
Dependent Claim
62 words
The method of manufacturing a rotor assembly of claim 1, the step of molding the rotor hub including embedding one end of said rotor shaft entirely within said molded material; forming a molded protrusion at the extremity of said molded rotor hub material in alignment with the longitdinal axis of said rotor shaft, said protrusion including external threads thereon for fan mounting.
Claim 6
Dependent Claim
60 words
The method of manufacturing a rotor assembly of claim 1, the step of molding the rotor hub including embedding a portion of one extremity of said rotor shaft within said molded material with the end of said extremity of said rotor shaft protruding externally from said molded material; and rolling external threads on said protruding shaft end for fan mounting.
Claim 7
Dependent Claim
53 words
The method of manufacturing a rotor assembly of claim 1, including the steps of rolling an oil groove at one end of said rotor shaft and rolling threads at the opposite end of said shaft prior to insertion and supporting within said central opening defined by said annular laminations of said rotor core.
Claim 8
Dependent Claim
35 words
The method of manufacturing a rotor assembly of claim 1, the step of forming said rotor core further including the step of grinding said rotor core prior to installation and supporting said rotor shaft therein.
References Cited (Backward Citations)
US4209722A
Cited
US4499661A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-13 | 1994-02-12 | 1994-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-13 | 1998-02-12 | 1998-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-13 | 2002-02-12 | 2002-08-14 | $7700.00 | Window Closed / Lapsed |