GB705559A - Improvements in eddy-current couplings, brakes and dynamometers - Google Patents

Abstract

705,559. Eddy-current couplings. DYNAMATIC CORPORATION. Oct. 7, 1952 [Dec. 29, 1951], No. 25059/52. Class 35. [Also in Group XXIV] An eddy-current clutch, brake or dynamometer comprises two relatively rotatable members, one of which is an eddy-current drum or drums and the other a toroidal field coil enclosed in an annular shell having flanking poles with bridging poles therebetween carried by a non-magnetic ring. Fig. 1 shows a clutch having two magnetic drums 41, 45 as the driven member and a surrounding driving magnetic field member 7. This member 7 comprises an outside ring 9 to which are welded rings 11, 13 flanking an annular field coil 15. The rings 11, 13 have claw type poles 21, 23 interdigitating with bridging poles 29 mounted on a central magnetic ring 27 which is carried by a non-magnetic ring 25. In Fig. 5 (not shown) there is only one eddycurrent drum 65 and two field coils 53, 55 mounted within cores having imbricated poles 57, 59, 61, 63. In Fig. 3 the inner member is the field system which includes a core 79, 81, 83 with claw-type teeth 85, 87 and magnetic bridging pole 89, and the external member is an eddycurrent drum comprising two magnetic rings 95, 97 separated by a brass ring 99, but, if desired, the two rings 95, 97 may be placed in magnetic contact. The drums 41, 45 in Fig. 1 can also be arranged in magnetic contact with each other. In Fig. 6 (not shown) there is a staggered arrangement of the claw-type teeth 109, 111 and of the bridging poles 115, 117. A liquid magnetic material may be used in the gap between the two rotating members. Specification 636,565 is referred to.