Patent US4876471A successfully refreshed from Google Patents.
US4876471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic drive coupler with constant torque independent of output slippage
Assignee: L'ENROULEUR ELECTRIQUE MODERNE A CORP OF FRANCE
•
Filing: 1987-11-24
•
Granted: 1989-10-24
•
Expires: 2007-11-24
Abstract
Abstract A magnetic coupler employing hysteresis for coupling a driving motor to a winding and reeling machine to produce a constant torque independent of any slippage between the input and output of the coupler. The coupler includes a driving disc molded of magnetic particles in an insulating binder interfaced with a driven disc formed of a radial array of permanent magnets.
Inventors
- 👤 Gilles Lacour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:13
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/06; H02K49/065; B; B65; B65H; B65H2403/00; B65H2403/70; B65H2403/72; B65H2403/724; H02K2213/00; H02K2213/09
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
128 words
A magnetic coupler for transferring rotary power between a drive and a load with substantially constant torque independent of load slippage comprising; an inductive sub-unit (2) having a plurality of poles (4,5), an induced sub-unit (6) having one or more hysteresis plates (11,12), said poles and plates being mounted in confrontational relationship for relative rotary motion with respect to each other, said one or more plates being at least partly made of a molded compound containing magnetic particles embedded therein, said particles having a maximum dimension less than 1/3 of the width of said poles, said particles being dispersed in 25 to 60% by volume of an electrically insulated binder, said hysteresis plates being in a heat conductive relationship with cooling elements (9,10) attached to the induced sub-unit.
Claim 2
Dependent Claim
128 words
A magnetic coupler for transferring rotary power between a drive and a load with substantially constant torque independent of load slippage comprising; an inductive sub-unit (2) having a plurality of poles (4,5), an induced sub-unit (6) having one or more hysteresis plates (11,12), said poles and plates being mounted in confrontational relationship for relative rotary motion with respect to each other, said one or more plates being at least partly made of a molded compound containing magnetic particles embedded therein, said particles having a maximum dimension less than 1/3 of the width of said poles, said particles being dispersed in 25 to 60% by volume of an electrically insulated binder, said hysteresis plates being in a heat conductive relationship with cooling elements (9,10) attached to the induced sub-unit.
Claim 3
Dependent Claim
25 words
The coupler of claim 1, wherein the molded compound (11, 12) of the hysteresis plates contains 30 to 40% by volume of electrically insulating binder.
Claim 4
Dependent Claim
32 words
The coupler of claim 1 wherein at least 75% by weight or volume of said magnetic particles have dimensions at least equal to 0.2 mm and preferably from 0.3 to 0.8 mm.
Claim 5
Dependent Claim
29 words
The coupler of claim 1 wherein the binder is made of electrically insulating particles embedded in a resin, the particles further having better heat conducting properties than the resin.
Claim 6
Dependent Claim
25 words
The coupler of claim 4, wherein the binder contains 40 to 80% by volume of particles of materials from the group: glass, alumina and ceramics.
Claim 7
Dependent Claim
35 words
The coupler of claim 1 wherein the cooling element is a support (9, 10) for the molded compound (11, 12) of non-magnetic, electrically poorly conducting material, the support (9, 10) being fitted with cooling fins.
Claim 8
Dependent Claim
15 words
The coupler of claim 6, wherein the support (9, 10) is made of plastic material.
Claim 9
Dependent Claim
15 words
The coupler of claim 7, wherein the plastic material is filled with mechanically reinforcing elements.
Claim 10
Dependent Claim
31 words
The use of a coupler according to claim 1 in a winding and unwinding mechanism, wherein the inductive sub-unit is formed of permanent magnets and the induced sub-unit is driven mechanically.
Claim 11
Dependent Claim
113 words
A magnetic coupler for transferring rotary power between a drive and a load with substantially constant torque independent of load slippage comprising: an inductive sub-unit (2) having a plurality of poles (4,5), an induced sub-unit (6) having one or more hysteresis plates (11,12), said poles and plates being mounted in confrontational relationship for relative rotary motion with respect to each other, said one or more plates being at least partly made of a molded compound containing magnetic particles embedded therein, said particles being dispersed in 25 to 60% by volume of an electrically insulated binder, said hysteresis plates being in a heat conductive relationship with cooling elements (9,10) attached to the induced sub-unit.
Claim 12
Dependent Claim
113 words
A magnetic coupler for transferring rotary power between a drive and a load with substantially constant torque independent of load slippage comprising: an inductive sub-unit (2) having a plurality of poles (4,5), an induced sub-unit (6) having one or more hysteresis plates (11,12), said poles and plates being mounted in confrontational relationship for relative rotary motion with respect to each other, said one or more plates being at least partly made of a molded compound containing magnetic particles embedded therein, said particles being dispersed in 25 to 60% by volume of an electrically insulated binder, said hysteresis plates being in a heat conductive relationship with cooling elements (9,10) attached to the induced sub-unit.
Claim 13
Dependent Claim
25 words
The coupler of claim 10, wherein the molded compound (11, 12) of the hysteresis plates contains 30 to 40% by volume of electrically insulating binder.
Claim 14
Dependent Claim
29 words
The coupler of claim 10, wherein the binder is made of electrically insulating particles embedded in a resin, the particles further having better heat conducting properties than the resin.
Claim 15
Dependent Claim
25 words
The coupler of claim 13, wherein the binder contains 40 to 80% by volume of particles of materials from the group: glass, alumina and ceramics.
Claim 16
Dependent Claim
35 words
The coupler of claim 10, wherein the cooling element is a support (9, 10) for the molded compound (11, 12) of non-magnetic, electrically poorly conducting material, the support (9, 10) being fitted with cooling fins.
Claim 17
Dependent Claim
15 words
The coupler of claim 10, wherein the support (9, 10) is made of plastic material.
Claim 18
Dependent Claim
15 words
The coupler of claim 15, wherein the plastic material is filled with mechanically reinforcing elements.
Claim 19
Dependent Claim
31 words
The use of a coupler according to claim 10 in a winding and unwinding mechanism, wherein the inductive sub-unit is formed of permanent magnets and the induced sub-unit is driven mechanically.
References Cited (Backward Citations)
GB266799A
Cited
FR1602519A
Cited
US4502982A
Cited
US4553056A
Cited
US4601753A
Cited
US4558077A
Cited
US4696725A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |