US2428104A - Eddy-current apparatus - Google Patents

Eddy-current apparatus Download PDF

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Publication number
US2428104A
US2428104A US540202A US54020244A US2428104A US 2428104 A US2428104 A US 2428104A US 540202 A US540202 A US 540202A US 54020244 A US54020244 A US 54020244A US 2428104 A US2428104 A US 2428104A
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Prior art keywords
drum
teeth
rings
coil
magnetic
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Expired - Lifetime
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US540202A
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English (en)
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Winther Anthony
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Individual
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Priority to FR925341D priority Critical patent/FR925341A/fr
Priority to BE464392D priority patent/BE464392A/xx
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Priority to US540202A priority patent/US2428104A/en
Priority to GB2501/46A priority patent/GB607083A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
    • H02K49/02—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type
    • H02K49/04—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type of the eddy-current hysteresis type
    • H02K49/043—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type of the eddy-current hysteresis type with a radial airgap

Definitions

  • This invention relates to eddy-current apparatus, and with regard to certain more specific features, to infinitely variable torque transmissions y of the eddy-current slip clutch type.
  • an iniinitely variable eddy-current transmission having a low-inertia driven member which may be rapidly accelerated and decelerated for driving devices such as for example, textile knitting machines, automotive vehicles and the like; the provision of apparatus oi the class described which may be excited far above normal rating and caused proportionally to produce increased torque above normal torque rating much higher than that obtainable heretofore; the provision ofv apparatus of the class described which operates with a relatively large reliable magnetic gap; and the provision of apparatus oi this class which is substantiallyqsmall-l er in size than apparatus of the general class proposed heretofore.
  • Fig. l is a longitudinal section of one form of the apparatus
  • Fig. 2 is a vertical section taken on line 2--2 of Fig. 1;
  • Fig. 3 is a vertical section taken on line 3--3 of Fig. 1;
  • Fig. 4 is a vertical section taken on line 4-4 of Fig. l;
  • Fig. 5 is a longitudinal section similar to Fig. ,-1 but showing another form of the invention.
  • Fig. 6 is a vertical section taken on line ,Q -S of Fis. 5;
  • Fig. 7 is a vertical section taken on line 1-1 of Fig. 5:
  • Fig. 8 is a vertical section taken on line ii--B of Fig. 5; i
  • Fig. 9 is a detailed section of a supporting spider used inthe Fig. 5 construction.
  • Fig. 10 is 9, right elevation of the supporting spider of Fig. 9;
  • Figs. 11 and 12 are graphs showing certain torque-speed relationships.
  • Eddy-current slip clutches have heretofore been constructed with relatively moving (sometimes called slipping) driving and I,driven members composedof magnetic materials, one of which was sometimes provided with a thin copper or like facing in conductive relation thereto. field winding was used which generated a ilux iield interlinking these members.,n One of the members carried flux-concentrating poles and the other received concentrated flux from these poles and constituted an armature.
  • the copper when used, was generally on, and in conductive rela- ⁇ tion to, the magnetic armature.
  • the relative motion (slip) between the members produced movements of concentrations of ux in the armature.
  • numeral I indicates a'motor frame from non-magnetic, highly conductive material may be used for the drum. It is supported upon a magnetic rim I1 of a spider or driven transmis- ⁇ sion member I9. The legs of the spider are formed with webs 29 which act as fan blades.
  • Several fastening means 2I in a single ring are used for bolting the copper drum I5 to the rim I1. This provides a single axial anchor for the drum I5, thus allowing it freely to expand and contract axially.
  • it is banded by means of helically wound wire 23 fastened at opposite ends to the rim I1, as indicated at 25. This wire prevents buckling without unduly interfering with axial expansion.
  • a hollow hub 21 of the spider I9 is bolted to a flange 29, the latter being welded to a driven shaft 3 I.
  • constitutes the power takeoi of the machine and it is between this shaft 3I and the drive shaft 3 that-a variable, torqueconverting slip coupling ls desired.
  • is carried upon spaced bearings 33 and 34 carried in an inner sleeve 32 of a housing be.l 35.
  • a spacing sleeve 31 and collar 39- space the inner races of these bearings on the shaft 3
  • An oil channel 4I in the bell 35 serves todeliver lubricant to the bearing 33.
  • Labyrinth means 45 prevents this oil from running from the bearing into the rotary parts of the machine.
  • an encasement 41 attached to the bell 35 which carries a shaft seal 49.
  • a generator unit 5I Between the shaft seal 49 and the bearings 34 is a generator unit 5I, the rotor 53 of which is driven by the shaft 3
  • the bell 35 is attached by means of bolts 59 to a main frame 51.
  • Radial openings 8i covered by means of a circular screen 63 allow inlet of air into one end of the machine. It will be noted from Fig. 3 that arms 55 are left between the openings.
  • Inwardly tapered teeth 61 extend from a ring 69 which is welded to the. frame 51 as indicated at 1 I. The ends of these teeth clear the wire winding'23 of the copper drum I5.
  • a stationary annular eld coil 13 Mounted in the frame 51, next to the toothed ring 61, 59 is a stationary annular eld coil 13. n the other side of this field coil is a second stationary toothed ring 15 having inwardly extending teeth 11. The ends of these teeth also clear the copper drum I including the wire winding 23. Notches 19 are located adjacent to an inlet opening 8
  • At numeral 83 is shown a second stationary annular field coil supported in the frame 51 in the plane of the central portion of the teeth 1.
  • Spacers 85 are shown as adjacent to the coil 83 and next to these are spaced, opposite, circular, radially laminar pole rings 81 and 89.
  • the laminated characters of these rings inhibit the formation therein of any substantial eddy currents, but being of magnetic iron, they will transmit a magnetic field.
  • the pole piece 89 is adjacent to the toothed ring 15 and the pole piece I1 has next to it a spacer ring 9
  • the frame 51 is attached ⁇ to the motor frame I by means of bolts 95. It carries openings 91 covered by a screen 99 for the outlet of circulated air. 'I'he pole rings 81 include axial openings therethrough forA said air circulation. Their inner peripheries are spaced from the drum I5 byv means of air gaps.
  • the toric iiux field F-I passes through the casing 51 (which is magnetic), the circular, laminar pole rings 81 and 89, twice through the non-magnetic but conductive copper drum i5 and through the teeth 1 of the drum 5.
  • the spaced and tapered character of these teeth concentrates this toric flux field in concentrations at spaced intervals peripherally around the copper drum I5.
  • the rotor 5 revolves the teeth 1 and causes progression of these ux concentrations through the copper drum I5.
  • the concentrated effect of this field is to some extent dissipated upon entering the laminar pole rings 81 and 89, but not altogether.
  • the pole rings 81 and 89 are laminated radially, very few eddy currents are generated in them due to these partially dissipated moving flux concentrations.
  • the drum I5 is made of copper in order to provide a higher conductivity than even solid iron, so that the passage of the flux concentration emanating from the teeth 1 will generate high eddycurrents in the drum.
  • the thickness of the copper drum I5 may, for example, be from .0625 inch up to 1% of an inch or so.
  • the sum of the air gaps on either side of the drum section may be of the same order.
  • a copper drum thickness of .16 inch may be used with an inside air gap' between the drum I5 and the teeth 1 of .08 inch and an outside gap between the drum I5 and the laminated pole rings 81 and 89 o'f .08 inch. This ⁇ makes a total flux gap between the ends of the teeth 1 and the laminated pole rings 81 and 88 of .32 inch.
  • flux concentrations emanating from the teeth1 pass on through the low resistance, eddy-current structure of the copper drum I5, and pass on into the substantially non-eddy-current inner surfaces of the pole rings 81 and 89.
  • concentrations in passing through the merely conductive and non-magnetic drum I5 do not dissipate as much as they-would if the drum I5 were backed up by, and in direct conductive contact with, an ordinary iron inductor, as heretofore was the case with copper facings on iron inductors.
  • the polar rings 81 and 89 herein are substantially not inductors at all but simply close the magnetic circuit. The result is that currents are efficiently obtainable in the conductive Adrum I5 and consequently high reactive driving the ends of teeth 1 nearer to and including saturation for delivery of additional much higher torque from spider 5 to drum I5 under conditions of higher slip, as for example during acceleryation.
  • the teeth 51 and 11 are fixed to the frame and I the flux field F--Z from coil 13 is therefore sta- Itionary. But it is concentrated at intervals by these teeth.
  • This field passes through the magnetic drum I1, traversing also the wire and air gap.
  • the toric flux field thus interlinking the drum I5 may be caused to exert a braking reaction on the driven elements attached to the drum I5.
  • the driven shaft 3I may be rapidly decelerated when required.
  • Another current of air passes around the righthand end of the copper drum I5 and passes through it, traversing the openings in spider I9 and the spaces between teeth 1 through the fan ⁇ blades II to be projected through the outlets 91.
  • the device can be either oil or water cooled if conditions warrant it.
  • an important feature of the invention is the use per se of the independently movable copper-drum armature, which, so far as are concerned the torque transmitting elements of the machine, is not attached to any magnetic ilux circuit-forming means.
  • the magnetic flux circuit-forming means for completing the magnetic circuit on the side of the drum I5 opposite the teeth 1 is composed only by the spaced, non-eddy-currentformi-ng inner polar surfaces of the rings 81 and 85.
  • the fiux-concentrating teeth such, as 1 on the driving member may be internal with respect to the copper drum I5, these may be external and tapered radially inward with the associated fixed coil 83 on the inside of the drum along with the laminated polar rings 81 and 89. This would simply be an inversion without change of essential principle.
  • the teeth 1 taper toward the non-magnetic, eddycurrent drum I5. This taper allows the ends of the teeth to operate at flux saturation under suitable excitation above normal of the field coil 83.
  • the copper Inductor drum and the'fiux gaps associated with it are -of thicknesses which allow transmission of normal torque at low slip speeds at flux densities at the ends of the teeth which are substantially below saturation; and to transmit greater torques at flux densitiesfrom the teeth which are closer to or at saturation and obtainable by increased excitation of the coil I5.
  • Fig. 11 shows curves A to F which are torquespeed curves at various excitations of the field coil 83 in apparatus of this class employing a 5 H. P. motor I.
  • the horizontal dotted line G indicates normal torque required at minimum slip.
  • Fig. 12 is a torque-speed graph under conditions of over-excitation which may be tolerated for short intervals.
  • a normal torque line of 15 lbs. ft. is shown at G.
  • the curves J to N show what torques are available at various speeds under various conditions of tolerable over-excitation.
  • the curve N shows 25 amperes of excitation, which is 21/2 times normal (compare curve F of Fig. 11).
  • This curve N also shows a peak at 340 lbs. ft. torque, or, about 221/2 times the torque required to make the unit a commercial item at 1800 R. P. M. maximum speed. Stated otherwise, Fig.
  • Both Figs. l1 and 12 exhibit data taken from a unit designed for H. P. at 1800 R, P. M. with a normal torque of lbs. ft.
  • the unit is capable of producing the enormous excess torque shown in Fig. 12 (necessarily at the higher slip).
  • With the older type of machine it would have required a 116 H. P. unit at 1800 R. P. M. to produce the 340 lbs. ft. of torque shown in Fig. 12 at 800 R. P. M output which corresponds to a slip-condition of the order of 1000 R. P. M. It must be remembered in this connection that there is some slip even at the normal torque speed rating.
  • to obtain 1800 R. P. M. about 50 R. P. M. of slip is required since a device of this nature has no torque at synchronous speeds of the driving and driven elements.
  • Figs. 5-10 is shown another form of the invention in which numeral
  • 08 for the fan blades is staked to the left end of the spider
  • the air outlets are shown at
  • is carried in spaced bearings
  • 31 is used between bearings along with a spacing ring
  • 55 of the generator is supported on ring
  • 51 are shown at
  • 51 is shown in detail in Fig. 9. It comprises extensions
  • 08 spacedly surround a central cylinder
  • 4 are used for bolting this iiange
  • 6 hold this main frame member to a ring
  • 51 carries a stationary magnetic sleeve
  • 24 are opposite the webs
  • 24 concentrate this flux field at intervals, considered peripherally. This constitutes the braking field.
  • the copper drum is shown at
  • This provides the desired central axial anchorage permitting free lateral and axial expansion of the copper.
  • One end of this drum I5 extends between the rows of teeth
  • the copper drum Ill is extended in the opposite direction along the outside of the teeth
  • the toric flux field F-3 generated by coil
  • Braking action occurs when desired by energizing the coil
  • Air circulation is maintained by the fan which draws air in through the grill
  • Torque transmission apparatus comprising an annular field coil producing a torio flux field, a pair of magnetic pole rings radially laminated, a driving member, a driven member, flux-concentrating magnetic pole means on one of said members reaching from one of said rings to the other but spaced therefrom and completing while concentrating the magnetic circuit therebetween, and a non-magnetic eddy-current conductive means on the other member and extending through thespaces between the said rings and said pole members.
  • Torque transmission apparatus comprising an annular field coil producing a toric flux field, magnetic pole-forming rings on Opposite sides of said field coil, means whereby induction of eddy currents is substantially inhibited in the rings, a driving member, a driven member, said members being relatively rotary, one oi said members carrying magnetic flux-concentrating teeth extending axially through the coil and from one ring to the other but spaced from both rings, the other member carrying a non-magnetic eddycurrent inductor extending spacedly between said rings and the teeth.
  • Torque transmission apparatus comprising an annular eld coil producing a toric flux held, annular and radially laminated magnetic poleforming rings on opposite sides of said field coil 'wherein induction of eddy currents is substana laminated magnetic pole ring located on each side of said coil and carrying the magnetic field, a rotary driven member carrying a thin nonmagnetic, eddy-current drum of high conductivity and extending through said rings and spaced therefrom by small gaps.
  • a rotary driving .member carrying magnetic axially-directed nuxconcentrating teeth, the ends of 'which are spaced from the inside of the drum and which extend axially from the plane of one of said rings to the plane of the other.
  • Torque transmission apparatus comprising a driving member. a driven member, a conductive drum fastened to one of said members and polar teeth on the other member, axially spaced and stationary radially laminated rings forming axially spaced gaps with respect to said conductive member on one side thereon, said polar teeth being located on the other side of said conductive member and forming a gap with respect thereto, said teeth extending axially between the planes of said rings, and a coil between said rings exciting a toric iiux field interlinking the teeth with the rings through the conducting members through said air gaps, the sum o1' the thickness of said drum and of the two gaps on each side oi' it being of the order oi' one-half inch or less.
  • Torque transmission apparatus comprising driving and driven transmission members, axially spaced stationary magnetic rings which are radially laminated to suppress eddy currents, magnetic teeth on one of said transmission members and extending axially from the plane of one ring to the plane of the other and being in radially spaced relation thereto, a highly conductive non-magnetic drum attached to the other transmission member and forming gaps with respect to the rings and the teeth, and an annular coil between said rings forming a toric iiux field interlinking the rings with the teeth through said conductive drum and through said gaps.
  • Torque transmission apparatus comprising a driving transmission member, a driven transmission member, a stationary magnetic frame, stationary magnetic axially spaced rings in said frame, said rings being radially laminated to suppress eddy currents therein, an annular iield coil carried in said frame and located between said rings, a conductive non-magnetic drum attached to one of said transmission members and extending through said rings and eld coil and being in spaced relation thereto to form gaps,
  • Torque transmission apparatus comprising a driving transmission member, a driven transmission member, a stationary magnetic frame, stationary magnetic axially spaced rings in said frame, each ring being radially laminated to suppress eddy currents therein, an annular eld coil in said frame and between said rings, a conductive drum on one of the transmission members and extending through said rings and held coil and in spaced relation thereto forming gaps with respect to the rings.
  • linx-concentrating teeth peripherally arranged on the other transmission member and respectively extending axially from one of said rings to the other but within said drum and forming a gap with respect to the drum, and means for energizing said coil to excite a torio ux i'leld interlinking the frame, said rings, said teeth and passing through axially spaced portions of said drum.
  • Torque transmission apparatus comprising a driving transmission member, a driven transmission member, a stationary magnetic frame, stationary magnetic axially spaced rings in said frame, each ring being radially laminated to suppress eddy currents therein, an annular field coil in said frame and between said rings, a conductive drum attached to one transmission member and extending through said rings and field coil and in spaced relation thereto forming gaps with respect to the rings, flux-concentrating teeth peripherallyarranged on the other transmission member and respectively extending axially from one of said rings to the other but within said drum and forming gaps with respect to the drum, and means for energizing said coil to excite a toric flux eld interlinking the frame, said rings, said teeth and passing through axially spaced portions of said drum, air circulating lmeans connected to the driving member, means for admitting air to both sides of the drum whereby air may be drawn both through the drum along said teeth and along the-outside of the drum through said openings in the rings.
  • Torque transmission apparatus comprising an annular field coil producing a toric iiux eld, a peripherally smooth magnetic pole-forming ring adjacent to said field coil, means whereby induction of eddy currents is substantially inhibited in said ring, a driving member, a driven member, said members being relatively rotary, one of said members carrying flux-concentrating teeth extending in a direction from a location adjacent to the coil to a location adjacent to said ring but spaced from both, the other member carrying a homogeneous nonmagnetic eddy-current inductor extending spacedly between said ring and the teeth. 4
  • Torque transmission apparatus comprising an annular ileld coil producing a toric flux eld, a peripherally smooth magnetic pole-forming ring at one end of said fieldv coil and coaxial therewith, means whereby induction of eddy currents is substantially inhibited in said ring, a driving member, a driven member, said members being relatively rotary and coaxial with the coil and ring, one of said members peripherally carrying flux-concentrating teeth extending axially from a radial location in the plane of the coil to a radial location in the plane of the pole-forming ring but radially spaced from both, the other member carrying a homogeneous nonmagnetic eddy-current inductor extending spacedly between said ring and the teeth and also being coaxial with the coil and the ring.
  • Torque transmission apparatus comprising an annular ileld coil producing a toric ux eld, magnetic pole-forming rings on opposite sides of said field coil, means whereby induction of eddy currents is substantially inhibited in the rings, a driving member, a driven member, said members being relatively rotary, one of said members carrying magnetic nunc-concentrating teeth extending across the coil from one ring to the other but spaced from both rings, the other member carrying a nonmagnetic eddy current inductor extending spacedly between said rings and the teeth.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
US540202A 1944-06-14 1944-06-14 Eddy-current apparatus Expired - Lifetime US2428104A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR925341D FR925341A (ko) 1944-06-14
BE464392D BE464392A (ko) 1944-06-14
US540202A US2428104A (en) 1944-06-14 1944-06-14 Eddy-current apparatus
GB2501/46A GB607083A (en) 1944-06-14 1946-01-25 Improvements in eddy current clutches or slip couplings

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US607083XA 1944-06-14 1944-06-14
US540202A US2428104A (en) 1944-06-14 1944-06-14 Eddy-current apparatus

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Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2827580A (en) * 1952-09-03 1958-03-18 Eaton Mfg Co Dynamoelectric rotor with cooling fins
US2847594A (en) * 1954-02-24 1958-08-12 Leon Naiditch Electromagnetic slip coupling
US2871383A (en) * 1956-05-14 1959-01-27 Eaton Mfg Co Electric coupling and brake
US2906900A (en) * 1957-04-23 1959-09-29 Cohen Elie Magnetic variable-speed device
US3076109A (en) * 1959-01-23 1963-01-29 Leon Naiditch Air-cooled eddy-current coupling and brake
US3238402A (en) * 1960-07-26 1966-03-01 Bliss E W Co Electromagnetic clutch
US3249778A (en) * 1961-09-01 1966-05-03 Gen Electric Eddy current coupling
US6208053B1 (en) 1999-08-30 2001-03-27 Mpc Products Corporation Adjustable torque hysteresis clutch
US20040051414A1 (en) * 2002-09-16 2004-03-18 Visteon Global Technologies, Inc. Increased torque in retarder brake system through use of conductive layer
US9130446B2 (en) 2012-11-28 2015-09-08 Abd El & Larson Holdings, LLC Eddy current torque transfer coupling assembly
US10020720B2 (en) 2014-08-18 2018-07-10 Eddy Current Limited Partnership Latching devices
US10110089B2 (en) 2014-08-18 2018-10-23 Eddy Current Limited Partnership Tuning of a kinematic relationship between members
US10300397B2 (en) * 2013-12-16 2019-05-28 Eddy Current Limited Partnership Assembly to control or govern relative speed of movement between parts
US10498210B2 (en) 2014-08-18 2019-12-03 Eddy Current Limited Partnership Tuning of a kinematic relationship between members
US10532662B2 (en) 2014-08-20 2020-01-14 TruBlue LLC Eddy current braking device for rotary systems
US10693360B2 (en) 2014-12-04 2020-06-23 Eddy Current Limited Partnership Transmissions incorporating eddy current braking
US10774887B2 (en) 2014-12-04 2020-09-15 Eddy Current Limited Partnership Latch activation between members
US10940339B2 (en) 2014-12-04 2021-03-09 Eddy Current Limited Partnership Energy absorbing apparatus
US10953848B2 (en) 2015-12-18 2021-03-23 Eddy Current Limited Partnership Variable behavior control mechanism for a motive system
US11050336B2 (en) 2014-12-04 2021-06-29 Eddy Current Limited Partnership Methods of altering eddy current interactions
US11114930B2 (en) 2014-12-04 2021-09-07 Eddy Current Limited Partnership Eddy current brake configurations
US11123580B2 (en) 2009-03-10 2021-09-21 Eddy Current Limited Partnership Line dispensing device with Eddy current braking for use with climbing and evacuation
US12009721B2 (en) 2014-12-04 2024-06-11 Eddy Current Limited Partnership Eddy current brake configurations

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1176745B (de) * 1958-07-15 1964-08-27 Pye Ltd Elektromagnetische Induktionskupplung

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US579051A (en) * 1897-03-16 fiske
US876949A (en) * 1905-10-10 1908-01-21 Frederick L Luz Armature-banding.
US1271401A (en) * 1917-02-15 1918-07-02 Edward E Stout Magnetic clutch.
US1418390A (en) * 1918-01-23 1922-06-06 Neuland Electric Company Inc Dynamo-electric machine
US1977600A (en) * 1934-03-07 1934-10-16 Winther Anthony Electromagnetic pole
US2233060A (en) * 1939-12-02 1941-02-25 Nat Pneumatic Co Combined clutch and brake
US2287953A (en) * 1940-05-04 1942-06-30 Martin P Winther Electrical apparatus
US2289330A (en) * 1938-06-28 1942-07-07 Fischer Franz Control device
GB558961A (en) * 1942-07-20 1944-01-28 Heenan & Froude Ltd Improvements in electric eddy current brakes, dynamometers and clutches

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US579051A (en) * 1897-03-16 fiske
US876949A (en) * 1905-10-10 1908-01-21 Frederick L Luz Armature-banding.
US1271401A (en) * 1917-02-15 1918-07-02 Edward E Stout Magnetic clutch.
US1418390A (en) * 1918-01-23 1922-06-06 Neuland Electric Company Inc Dynamo-electric machine
US1977600A (en) * 1934-03-07 1934-10-16 Winther Anthony Electromagnetic pole
US2289330A (en) * 1938-06-28 1942-07-07 Fischer Franz Control device
US2233060A (en) * 1939-12-02 1941-02-25 Nat Pneumatic Co Combined clutch and brake
US2287953A (en) * 1940-05-04 1942-06-30 Martin P Winther Electrical apparatus
GB558961A (en) * 1942-07-20 1944-01-28 Heenan & Froude Ltd Improvements in electric eddy current brakes, dynamometers and clutches

Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2827580A (en) * 1952-09-03 1958-03-18 Eaton Mfg Co Dynamoelectric rotor with cooling fins
US2847594A (en) * 1954-02-24 1958-08-12 Leon Naiditch Electromagnetic slip coupling
US2871383A (en) * 1956-05-14 1959-01-27 Eaton Mfg Co Electric coupling and brake
US2906900A (en) * 1957-04-23 1959-09-29 Cohen Elie Magnetic variable-speed device
US3076109A (en) * 1959-01-23 1963-01-29 Leon Naiditch Air-cooled eddy-current coupling and brake
US3238402A (en) * 1960-07-26 1966-03-01 Bliss E W Co Electromagnetic clutch
US3249778A (en) * 1961-09-01 1966-05-03 Gen Electric Eddy current coupling
US6208053B1 (en) 1999-08-30 2001-03-27 Mpc Products Corporation Adjustable torque hysteresis clutch
US20040051414A1 (en) * 2002-09-16 2004-03-18 Visteon Global Technologies, Inc. Increased torque in retarder brake system through use of conductive layer
US6900569B2 (en) 2002-09-16 2005-05-31 Visteon Global Technologies, Inc. Increased torque in retarder brake system through use of conductive layer
US11123580B2 (en) 2009-03-10 2021-09-21 Eddy Current Limited Partnership Line dispensing device with Eddy current braking for use with climbing and evacuation
US9130446B2 (en) 2012-11-28 2015-09-08 Abd El & Larson Holdings, LLC Eddy current torque transfer coupling assembly
US11628373B2 (en) 2013-12-16 2023-04-18 Eddy Current Limited Partnership Assembly to control or govern relative speed of movement between parts
US11266917B2 (en) 2013-12-16 2022-03-08 Eddy Current Limited Partnership Assembly to control or govern relative speed of movement between parts
US10300397B2 (en) * 2013-12-16 2019-05-28 Eddy Current Limited Partnership Assembly to control or govern relative speed of movement between parts
US10603596B2 (en) 2013-12-16 2020-03-31 Eddy Current Limited Partnership Assembly to control or govern relative speed of movement between parts
US10873242B2 (en) 2014-08-18 2020-12-22 Eddy Current Limited Partnership Tuning of a kinematic relationship between members
US11515776B2 (en) 2014-08-18 2022-11-29 Eddy Current Limited Partnership Tuning of a kinematic relationship between members
US11735992B2 (en) 2014-08-18 2023-08-22 Eddy Current Limited Partnership Tuning of a kinematic relationship between members
US11632016B2 (en) 2014-08-18 2023-04-18 Eddy Current Limited Partnership Tuning of a kinematic relationship between members
US10020720B2 (en) 2014-08-18 2018-07-10 Eddy Current Limited Partnership Latching devices
US10594200B2 (en) 2014-08-18 2020-03-17 Eddy Current Limited Partnership Latching devices
US11437903B2 (en) 2014-08-18 2022-09-06 Eddy Current Limited Partnership Latching devices
US10971988B2 (en) 2014-08-18 2021-04-06 Eddy Current Limited Partnership Latching devices
US11316404B2 (en) 2014-08-18 2022-04-26 Eddy Current Limited Partnership Tuning of a kinematic relationship between members
US10110089B2 (en) 2014-08-18 2018-10-23 Eddy Current Limited Partnership Tuning of a kinematic relationship between members
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GB607083A (en) 1948-08-25
FR925341A (ko) 1947-09-16
BE464392A (ko)

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