US3628239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making dynamo machines
Assignee: ZF International UK Ltd
•
Filing: 1969-02-04
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Granted: 1971-12-21
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Expires: 1989-02-04
Abstract
Abstract A method of manufacturing a permanent magnet rotor including the steps of positioning a plurality of permanent magnets between a central polygonal core and an outer pole assembly so that the magnets are in contact with both the pole assembly and respective faces of the core, then deforming at least one axial end of the core to prevent relative axial movement between the core and the magnets, encapsulating the unit thus formed, and then removing portions of the pole assembly to separate the poles.
Inventors
- 👤 John William Archibald Hunt
- 👤 Bernard Alan Potter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:53
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/274; H02K1/2753; H02K1/276; H02K1/2766; H02K1/2773; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
140 words
A method of manufacturing a permanent magnet rotor for a dynamo electric machine, said method including the steps of: positioning a plurality of permanent magnets between (1) a central polygonal core having radially extending flanges on either axial end thereof, and (2) an outer pole assembly which includes a plurality of interconnecting poles, so that the magnets are in contact with both the pole assembly and respective faces of the core; applying heat and pressure to the flanges of the core to deform the flanges about the permanent magnets and to effect a weld between the permanent magnets and the flanges so that the permanent magnets are trapped in an axial direction between the deformed flanges and are held relative to the core; thereafter encapsulating the unit thus formed; and removing portions of the pole assembly to separate the poles.
Claim 2
Independent Claim
140 words
A method of manufacturing a permanent magnet rotor for a dynamo electric machine, said method including the steps of: positioning a plurality of permanent magnets between (1) a central polygonal core having radially extending flanges on either axial end thereof, and (2) an outer pole assembly which includes a plurality of interconnecting poles, so that the magnets are in contact with both the pole assembly and respective faces of the core; applying heat and pressure to the flanges of the core to deform the flanges about the permanent magnets and to effect a weld between the permanent magnets and the flanges so that the permanent magnets are trapped in an axial direction between the deformed flanges and are held relative to the core; thereafter encapsulating the unit thus formed; and removing portions of the pole assembly to separate the poles.
Claim 3
Dependent Claim
56 words
A method as claimed in claim 1 in which the magnets are located in angularly spaced channels in the pole assembly, the portions of the pole assembly between the channels defining ribs which are removed to separate the poles and the ribs having therein grooves which are shaped to define surfaces which key into the encapsulation.
References Cited (Backward Citations)
US1991046A
Cited
US2335378A
Cited
US2475776A
Cited
US2655611A
Cited
US2739253A
Cited
US3077026A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |