US4445272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for stacking rotor blanks on a shaft
Assignee: International Business Machines Corp
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Filing: 1982-11-02
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Granted: 1984-05-01
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Expires: 2002-11-02
Abstract
Abstract A method of, and an apparatus for, constructing a laminated rotor for use in high speed stepping motors or the like. The apparatus consists of a rotatable carousel having a plurality of rotatable work stations each of which is carried to a plurality of operating stations. Lamina are punched from sheet metal stock and brought back into the stock and held in a friction fit. Sheet stock is then advanced to a stacking station where a lamina is forced onto a rotor shaft. The shaft is rotated thereafter in order to uniformly distribute any local metalurgical or planarity inconsistencies in the sheet stock throughout the laminated structure.
Inventors
- 👤 Peter H. Bruhn
- 👤 Rolf Wustrau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:36
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/02; H02K15/028; B; B21; B21D; B21D28/00; B21D28/02; B21D28/10; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49012; Y10T29/51; Y10T29/5136; Y10T29/5137; Y10T29/5138; Y10T29/5142; Y10T29/53; Y10T29/5313; Y10T29/53143; Y10T29/53161; Y10T29/5317; Y10T83/00; Y10T83/202; Y10T83/209
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
135 words
A method of manufacturing a uniform stepper motor rotor of a predetermined stack height from laminae with apparatus including a lamina punch for punching laminae from sheet stock strip, a rotatable carousel having a plurality of rotatable work stations each carrying a rotor shaft, and a work station punch, said method comprising: (a) punching a lamina from said stock strip with said lamina punch and returning said lamina to said stock strip; (b) advancing said stock strip to one of said work stations; (c) punching said previously punched lamina from said stock strip and forcing said lamina onto said shaft; (d) rotating said shaft for each lamina forced onto said shaft; (e) repeating steps a through d until said predetermined stack height is achieved; and (f) rotating said carousel upon completion of said rotor stack.
Claim 2
Independent Claim
135 words
A method of manufacturing a uniform stepper motor rotor of a predetermined stack height from laminae with apparatus including a lamina punch for punching laminae from sheet stock strip, a rotatable carousel having a plurality of rotatable work stations each carrying a rotor shaft, and a work station punch, said method comprising: (a) punching a lamina from said stock strip with said lamina punch and returning said lamina to said stock strip; (b) advancing said stock strip to one of said work stations; (c) punching said previously punched lamina from said stock strip and forcing said lamina onto said shaft; (d) rotating said shaft for each lamina forced onto said shaft; (e) repeating steps a through d until said predetermined stack height is achieved; and (f) rotating said carousel upon completion of said rotor stack.
Claim 3
Dependent Claim
22 words
The method of claim 1 including the additional step of placing a one way clip on said shaft to maintain laminae position.
Claim 4
Independent Claim
30 words
The method of either of claims 1 or 2 including also the step of sensing the height of the laminae accumulating on the shaft to determine completion of said rotor.
Claim 5
Dependent Claim
92 words
In combination, apparatus for assembling on a shaft a laminated rotor comprising laminae fabricated from sheet stock including: a progressive die for forming interlockable laminae from and returning said laminae to said sheet stock; a blanking/stacking location at which is provided apparatus for punching from the sheet stock each lamina and stacking it on said shaft; a clip assembly location at which is provided apparatus for applying a clip for temporarily holding a stack in stable alignment; and a removal location where a completed rotor is removed and a new shaft provided.
Claim 6
Dependent Claim
92 words
In combination, apparatus for assembling on a shaft a laminated rotor comprising laminae fabricated from sheet stock including: a progressive die for forming interlockable laminae from and returning said laminae to said sheet stock; a blanking/stacking location at which is provided apparatus for punching from the sheet stock each lamina and stacking it on said shaft; a clip assembly location at which is provided apparatus for applying a clip for temporarily holding a stack in stable alignment; and a removal location where a completed rotor is removed and a new shaft provided.
Claim 7
Dependent Claim
24 words
The apparatus of claim 4 wherein the blanking/stacking location, clip assembly location, and removal location are positioned about the periphery of a rotatable carousel.
Claim 8
Dependent Claim
28 words
The apparatus of claim 5 wherein said carousel includes a plurality of work fixture stations each able to accept a shaft on which the laminated rotor is assembled.
Claim 9
Independent Claim
28 words
The apparatus of any of claims 4, 5 or 6 wherein the apparatus provided at said blanking/stacking location further includes means for rotating said shaft a predetermined distance.
Claim 10
Dependent Claim
28 words
The apparatus of claim 7 wherein said predetermined distance is determined by the distance between adjacent holes and projections formed on each individual lamina in said progressive die.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |