US3601641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eddy current and-or induction brake or clutch
Assignee: Max Baermann GmbH
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Filing: 1970-01-26
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Granted: 1971-08-24
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Expires: 1990-01-26
Abstract
Abstract An eddy current and/or induction brake or clutch comprised of, a braking inductor and a ferromagnetic eddy current conductor arranged for relative rotation with respect to one another. The inductor includes a plurality of pole shoes of alternating magnetic polarity arranged in an annular ring and a plurality of permanent magnets disposed intermediate the pole shoes. There is further provided electromagnetic means operatively associated with the permanent magnets for regulating the magnetic field generated by the inductor.
Inventors
- 👤 Max Baermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:11
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/02; H02K49/04; H02K49/043; H02K49/06; H02K49/065; H02K2213/00; H02K2213/09
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
109 words
An eddy current and/or induction brake or clutch comprising: a braking inductor; a ferromagnetic eddy current conductor adjacent said inductor and separated therefrom by an airgap; said inductor and conductor being arranged for relative rotation with respect to each other; said inductor having a plurality of pole shoes of alternating magnetic polarity arranged in an annular ring; a plurality of permanent magnets having a pair of opposite pole surfaces disposed intermediate adjacent shoes; and electromagnetic means operatively associated with said permanent magnets for selectively regulating the magnetic field generated by said inductor from a zero magnetic field in the airgap to a field greater than the permanent magnets themselves.
Claim 2
Dependent Claim
109 words
An eddy current and/or induction brake or clutch comprising: a braking inductor; a ferromagnetic eddy current conductor adjacent said inductor and separated therefrom by an airgap; said inductor and conductor being arranged for relative rotation with respect to each other; said inductor having a plurality of pole shoes of alternating magnetic polarity arranged in an annular ring; a plurality of permanent magnets having a pair of opposite pole surfaces disposed intermediate adjacent shoes; and electromagnetic means operatively associated with said permanent magnets for selectively regulating the magnetic field generated by said inductor from a zero magnetic field in the airgap to a field greater than the permanent magnets themselves.
Claim 3
Dependent Claim
17 words
The device defined in claim 1, wherein said pole shoes and said permanent magnets are radially extending.
Claim 4
Dependent Claim
53 words
The device defined in claim 2, wherein said permanent magnets are disposed intermediate each of said pole shoes to define a configuration of alternating permanent magnets and pole shoes, each of said permanent magnets having like pole surfaces in contact with said common pole shoe, whereby pole shoes of alternating polarity are produced.
Claim 5
Dependent Claim
49 words
The device defined in claim 3, wherein said electromagnetic means comprises field windings, said pole shoes including end portions which extend radially outward beyond said permanent magnets, said windings being disposed on said end portions and having a direction of winding which alternates from pole shoe to pole shoe.
Claim 6
Dependent Claim
22 words
The device defined in claim 1 further including cooling means for dissipating the heat produced in the eddy current conductor during braking.
Claim 7
Dependent Claim
20 words
The device defined in claim 5, wherein said cooling means comprises a liquid cooling system operatively associated with said conductor.
Claim 8
Dependent Claim
57 words
The device defined in claim 5, wherein said cooling means comprises a plurality of fins arranged on said conductor and a plurality of fan blades fixed with respect to said inductor, whereby when said inductor rotates relative to said conductor said fan blades generate a stream of air which flows past said fins to cool said conductor.
Claim 9
Dependent Claim
19 words
The device defined in claim 1, wherein said permanent magnets are magnetized in the direction of their smallest thickness.
Claim 10
Dependent Claim
54 words
The device defined in claim 1, which includes a ferromagnetic member disposed intermediate every other pair of adjacent pole shoes; said permanent magnets being disposed intermediate each remaining adjacent pair of said pole shoes with opposite pole surfaces in contaCt with adjacent pole shoe segments, whereby pole show segments of alternating polarity are produced.
Claim 11
Dependent Claim
35 words
The device defined in claim 9, wherein said electromagnetic means comprises field windings, said winding being disposed on said intermediate member and having a direction of winding which is the same for all pole shoes.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |