US5600194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic hysteresis clutch
Assignee: Ipalco BV
•
Filing: 1994-08-25
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Granted: 1997-02-04
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Expires: 2014-08-25
Abstract
Abstract A magnetic hysteresis clutch comprises a rotor supporting a ferromagnetic hysteresis material and a rotary magnetic inductor capable of inducing a magnetic field in the ferromagnetic hysteresis. The magnetic inductor and the ferromagnetic hysteresis clutch is constructed so that an increase in the magnetization losses in the ferromagnetic material, which accompanies an increase in the slip between magnetic inductor and the ferromagnetic hysteresis, leads to a reversible increase in the temperature of the ferromagnetic hysteresis material, and thereby to a reversible decrease in magnetization of the ferromagnetic material which is sufficient to bring about a desired decrease in the transmitted torque. Thus it is possible to provide a magnetic hysteresis clutch in which the transmitted torque reversibly decreases when the slip increases.
Inventors
- 👤 Risto Toukola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:26
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/06; H02K49/065
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
140 words
A magnetic hysteresis clutch comprising: a rotor supporting a ferromagnetic hysteresis material said rotor having a radius and being rotatable about an axis, and a rotary magnetic inductor capable of inducing a magnetic field in the ferromagnetic hysteresis material of the rotor said magnetic inductor having a radius and being rotatable about said axis; said magnetic inductor and said ferromagnetic hysteresis material being arranged with a radial or axial air gap there between, so as to allow relative rotation of one with respect to the other with a variable slip wherein; an increase in the losses in the ferromagnetic material, which accompanies a given increase in the slip, leads to a reversible decrease in the magnetization of the ferromagnetic hysteresis material in the magnetic field of the rotary magnetic inductor sufficient to produce a reversible decrease in the transmitted torque.
Claim 2
Dependent Claim
140 words
A magnetic hysteresis clutch comprising: a rotor supporting a ferromagnetic hysteresis material said rotor having a radius and being rotatable about an axis, and a rotary magnetic inductor capable of inducing a magnetic field in the ferromagnetic hysteresis material of the rotor said magnetic inductor having a radius and being rotatable about said axis; said magnetic inductor and said ferromagnetic hysteresis material being arranged with a radial or axial air gap there between, so as to allow relative rotation of one with respect to the other with a variable slip wherein; an increase in the losses in the ferromagnetic material, which accompanies a given increase in the slip, leads to a reversible decrease in the magnetization of the ferromagnetic hysteresis material in the magnetic field of the rotary magnetic inductor sufficient to produce a reversible decrease in the transmitted torque.
Claim 3
Dependent Claim
21 words
A magnetic hysteresis clutch as claimed in claim 1 wherein the ferromagnetic material is a material having a high electrical resistivity.
Claim 4
Dependent Claim
25 words
A magnetic hysteresis clutch as claimed in claim 2 wherein the ferromagnetic material is a sintered material which is based on electrically insulated metal powders.
Claim 5
Dependent Claim
27 words
A magnetic hysteresis clutch as claimed in claim 1 wherein the air gap between the magnetic inductor and the ferromagnetic hysteresis material is a radial air gap.
Claim 6
Dependent Claim
37 words
A magnetic hysteresis clutch as claimed in claim 4 wherein the magnetic inductor comprises a plurality of wheels mounted on a shaft, each of said wheels supporting a plurality of permanent magnets on a radial peripheral ring.
Claim 7
Dependent Claim
41 words
A magnetic hysteresis clutch as claimed in claim 5 wherein the ferromagnetic hysteresis material is constituted in the form of axially separated rings, each of which rings surrounding one of said wheels and defining a radial air gap with the latter.
Claim 8
Dependent Claim
26 words
A magnetic hysteresis clutch as claimed in claim 6 wherein the radial overlapping of at least one of said wheels and the corresponding ring is adjustable.
Claim 9
Dependent Claim
19 words
A magnetic hysteresis clutch as claimed in claim 6 wherein the rotor supporting the rings comprises longitudinal cooling fins.
Claim 10
Dependent Claim
24 words
A magnetic hysteresis clutch as claimed in claim 5 wherein each of the said wheels of the inductor supports a plurality of individual magnets.
Claim 11
Dependent Claim
75 words
A magnetic hysteresis clutch as claimed in claim 6 wherein heating and cooling, of the permanent magnets in continuous operation is accompanied by parallel heating and parallel cooling, of the wheels supporting these permanent magnets, so that the variations in the diameters of the wheels, due to this heating and cooling, automatically compensate for a decrease and an increase, respectively, in the magnetic field produced, by a reduction, or an increase, in the air gap.
Claim 12
Dependent Claim
46 words
A reeling-in/reeling-out device comprising a drive motor and a reeling-in/reeling-out drum, in combination with a magnetic hysteresis clutch according to claim 1 wherein said magnetic inductor is coupled to the reeling-in/reeling-out drum and said rotor supporting the ferromagnetic hysteresis material is coupled to the drive motor.
Claim 13
Dependent Claim
20 words
A reeling-in/reeling-out device as claimed in claim 11, including a speed reducer connected between the rotor and the reeling-in/reeling-out drum.
Claim 14
Dependent Claim
19 words
A magnetic hysteresis clutch as claimed in claim 7 wherein the rotor supporting the rings comprises longitudinal cooling fins.
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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) | 2000-02-04 | 2000-08-05 | 2001-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-04 | 2004-08-05 | 2005-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-04 | 2008-08-05 | 2009-02-04 | $7700.00 | Window Closed / Lapsed |