US3553511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent magnet rotor assembly directly secured on non-magnetic shaft
Assignee: ZF International UK Ltd
•
Filing: 1969-02-17
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Granted: 1971-01-05
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Expires: 1989-02-17
Abstract
Abstract In a dynamoelectric machine in which a rotor shaft carries a permanent magnet rotor assembly, the rotor shaft has a pair of bearing portions which are spaced-apart by a central portion of nonmagnetic material. The bearing portions are secured to the central portion, which carries the permanent magnet rotor assembly.
Inventors
- 👤 Robert Hemmings
- 👤 John William Archibald Hunt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:58
CPC Classifications
H; H02; H02K; H02K21/00; H02K21/12; H02K21/14; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/2713
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
56 words
A rotor shaft for a dynamoelectric machine having a permanent magnet rotor assembly, comprising a pair of bearing portions which are spaced-apart by a separate central portion of nonmagnetic material, said being portion being secured to said central portion, and said central portion carrying said permanent magnet rotor assembly without the interposition of a nonmagnetic sleeve.
Claim 2
Dependent Claim
56 words
A rotor shaft for a dynamoelectric machine having a permanent magnet rotor assembly, comprising a pair of bearing portions which are spaced-apart by a separate central portion of nonmagnetic material, said being portion being secured to said central portion, and said central portion carrying said permanent magnet rotor assembly without the interposition of a nonmagnetic sleeve.
Claim 3
Dependent Claim
58 words
A dynamoelectric machine comprising a casinG supporting stator windings and a pair of bearings, and a rotor shaft having a pair of bearing portions supported by said bearings respectively, and a central nonmagnetic portion having been secured to said bearing portions by friction welding and carrying a permanent magnet rotor assembly without the interposition of a nonmagnetic sleeve.
Claim 4
Dependent Claim
58 words
A dynamoelectric machine comprising a casinG supporting stator windings and a pair of bearings, and a rotor shaft having a pair of bearing portions supported by said bearings respectively, and a central nonmagnetic portion having been secured to said bearing portions by friction welding and carrying a permanent magnet rotor assembly without the interposition of a nonmagnetic sleeve.
Claim 5
Dependent Claim
19 words
(An arrangement) A machine as claimed in (claim 1 or) claim 2 in which the bearing portions are steel.
Claim 6
Dependent Claim
23 words
(An arrangement) A machine as claimed in (any one of claims 1 to 3) claim 2 in which the central portion is aluminum.
References Cited (Backward Citations)
US1579798A
Cited
GB972364A
Cited
US3392294A
Cited
US3411027A
Cited
US3407317A
Cited
US3459980A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |