272:, which is created by the coils that are placed in the rotating receiver, and the stationary transmitter. Wireless slip rings are considered an upgrade from — or alternative to — traditional slip rings, as their lack of standard mechanical rotating parts means they are typically more resilient in harsh operating environments and require less maintenance. However, the amount of power that can be transmitted between coils is limited; typically a traditional contact-type slip ring can transmit orders of magnitude more power in the same volume.
244:-wetted slip rings, noted for their low resistance and stable connection use a different principle which replaces the sliding brush contact with a pool of liquid metal molecularly bonded to the contacts. During rotation the liquid metal maintains the electrical connection between the stationary and rotating contacts. However, the use of mercury can pose safety concerns if not properly handled, as it is a toxic substance. The slip ring device is also limited by temperature, as mercury solidifies at approximately -40 °C.
20:
154:
225:
252:
A pancake slip ring has the conductors arranged on a flat disc as concentric rings centered on the rotating shaft. This configuration has greater weight and volume for the same circuits, greater capacitance and crosstalk, greater brush wear and more readily collects wear debris on its vertical axis.
206:
to function concurrently with the device, commonly referred to as a rotary joint. Slip rings do the same for electrical power and signal that rotary unions do for fluid media. They are often integrated into rotary unions to send power and data to and from rotating machinery in conjunction with the
232:
Slip rings are made in various types and sizes; one device made for theatrical stage lighting, for example, had 100 conductors. The slip ring allows for unlimited rotations of the connected object, whereas a slack cable can only be twisted a few times before it will bind up and restrict rotation.
215:
The basic principle of slip rings can be traced back to the late 19th century when they were initially used in early electrical experiments and the development of electrical generators and motors. With the advent of the
Industrial Revolution and the increasing demand for electrical power, the
178:
Typically, a slip ring consists of a stationary graphite or metal contact (brush) which rubs on the outside diameter of a rotating metal ring. As the metal ring turns, the electric current or signal is conducted through the stationary brush to the metal ring making the connection. Additional
23:
Sketch of a cross-section of slip rings for an electric motor. In this example, the slip rings have a brush-lifting device and a sliding contact bar, allowing the slip-rings to be short-circuited when no longer required. This can be used in starting a slip-ring induction motor, for
216:
technology behind slip rings started to evolve. They became essential components in large-scale electrical machinery, such as turbines and generators, allowing for the transfer of power and signals in machines where a part of the machinery needed to rotate continuously.
267:
Wireless slip rings do not rely on the typical friction-based metal and carbon brush contact methods that have been employed by slip rings since their invention, such as those explored above. Instead, they transfer both power and data wirelessly
195:; however, commutators are somewhat different and are specialized for use on DC motors and generators. While commutators are segmented, slip rings are continuous, and the terms are not interchangeable.
289:
183:
or the rings are stationary and the other component rotates. This simple design has been used for decades as a rudimentary method of passing current into a rotating device.
146:
connection through a rotating assembly. Formally, it is an electric transmission device that allows energy flow between two electrical rotating parts, such as in a
52:
while transmitting power or signals. It can improve mechanical performance, simplify system operation and eliminate damage-prone wires dangling from movable joints.
782:
526:
293:
1170:
191:
Some other names used for slip ring are collector ring, rotary electrical contact and electrical slip ring. Some people also use the term
454:
398:
962:
519:
911:
253:
However, a pancake offers reduced axial length for the number of circuits, and so may be inappropriate in some applications.
696:
1044:
1054:
767:
740:
179:
ring/brush assemblies are stacked along the rotating axis if more than one electrical circuit is needed. Either the
1064:
1059:
512:
1139:
757:
735:
269:
467:
1175:
1008:
862:
1109:
1049:
600:
872:
777:
706:
139:
1003:
867:
605:
585:
565:
192:
998:
891:
640:
615:
80:
1104:
807:
802:
547:
84:
19:
1129:
1023:
978:
916:
886:
840:
663:
650:
262:
196:
314:
1089:
1039:
993:
921:
713:
701:
691:
450:
394:
356:
241:
33:
1144:
1134:
1079:
1074:
1018:
988:
936:
832:
822:
812:
762:
625:
595:
535:
425:
180:
108:
45:
1119:
1069:
931:
752:
730:
718:
686:
590:
120:
76:
1094:
1114:
1013:
983:
845:
797:
745:
673:
610:
553:
100:
37:
1164:
1124:
792:
158:
112:
96:
1149:
1084:
772:
203:
153:
132:
116:
92:
95:. They can be used on any rotating object to transfer power, control circuits, or
199:
are often used instead of slip rings in high-speed or low-friction environments.
926:
857:
290:"Cobham plc :: Aerospace and Security, Aerospace Communications, Annemasse"
143:
499:
817:
787:
658:
620:
88:
1099:
852:
128:
124:
335:
44:
from a stationary to a rotating structure. A slip ring can be used in any
881:
725:
681:
49:
957:
952:
224:
635:
559:
475:
376:
41:
504:
401:, page 379 with an illustration of pancake and drum-type slip rings.
223:
152:
147:
104:
508:
411:
468:"Slip Rings | How Does a Slip Ring Work • PowerbyProxi"
500:
Video depicting the interior of a slip ring in motion
167:
C - insulated connections to generator field winding,
783:
Dual-rotor permanent magnet induction motor (DRPMIM)
1032:
971:
945:
900:
831:
672:
649:
574:
445:Peter W. Fortescue, John Stark, Graham Swinerd
163:A - stationary spring-loaded graphite brushes,
520:
91:and in packaging machinery, cable reels, and
8:
527:
513:
505:
292:. Cobham.com. 2011-02-13. Archived from
18:
281:
36:device that allows the transmission of
426:"Frequently Asked Slip Ring Questions"
228:The two most common types of slip ring
207:media that the rotary union provides.
7:
75:, these rings are commonly found in
389:Alan Hendrickson, Colin Buckhurst
14:
202:A slip ring can be used within a
165:B - rotating steel contact ring,
142:terms) is a method of making an
391:Mechanical design for the stage
169:D - top end of generator shaft.
912:Timeline of the electric motor
447:Spacecraft systems engineering
61:rotating electrical connectors
1:
697:Dahlander pole changing motor
57:rotary electrical interfaces
1171:Electrical power connectors
741:Brushless DC electric motor
1192:
449:John Wiley and Sons, 2003
260:
187:Alternative names and uses
758:Switched reluctance (SRM)
736:Brushed DC electric motor
542:
237:Mercury-wetted slip rings
946:Experimental, futuristic
863:Variable-frequency drive
73:electrical rotary joints
16:Electromechanical device
963:Superconducting machine
601:Coil winding technology
107:such as those found on
428:. Moog.com. 2009-06-23
357:"Slip Ring definition"
229:
170:
140:electrical engineering
25:
1004:Power-to-weight ratio
868:Direct torque control
315:"how slip rings work"
227:
156:
81:electrical generators
48:system that requires
22:
999:Open-loop controller
892:Ward Leonard control
616:DC injection braking
336:"Slip Ring Glossary"
270:via a magnetic field
902:History, education,
548:Alternating current
377:"americansliprings"
257:Wireless slip rings
197:Rotary transformers
85:alternating current
1065:Dolivo-Dobrovolsky
1024:Voltage controller
979:Blocked-rotor test
917:Ball bearing motor
887:Motor soft starter
841:AC-to-AC converter
702:Wound-rotor (WRIM)
664:Electric generator
393:Focal Press, 2008
263:Rotary transformer
248:Pancake slip rings
230:
171:
26:
1158:
1157:
994:Open-circuit test
833:Motor controllers
714:Synchronous motor
536:Electric machines
109:aerodrome beacons
87:(AC) systems and
46:electromechanical
34:electromechanical
1183:
1009:Two-phase system
989:Electromagnetism
937:Mouse mill motor
904:recreational use
778:Permanent magnet
707:Linear induction
560:Permanent magnet
529:
522:
515:
506:
487:
486:
484:
483:
474:. Archived from
464:
458:
443:
437:
436:
434:
433:
422:
416:
415:
408:
402:
387:
381:
380:
373:
367:
366:
364:
363:
353:
347:
346:
344:
343:
332:
326:
325:
323:
322:
311:
305:
304:
302:
301:
286:
157:Slip rings on a
138:A slip ring (in
121:radio telescopes
77:slip ring motors
1191:
1190:
1186:
1185:
1184:
1182:
1181:
1180:
1176:Electric motors
1161:
1160:
1159:
1154:
1028:
967:
941:
932:Mendocino motor
905:
903:
896:
827:
687:Induction motor
668:
645:
591:Braking chopper
579:
577:
570:
538:
533:
496:
491:
490:
481:
479:
466:
465:
461:
444:
440:
431:
429:
424:
423:
419:
410:
409:
405:
388:
384:
375:
374:
370:
361:
359:
355:
354:
350:
341:
339:
334:
333:
329:
320:
318:
313:
312:
308:
299:
297:
288:
287:
283:
278:
265:
259:
250:
239:
222:
213:
189:
176:
168:
166:
164:
162:
101:digital signals
40:and electrical
17:
12:
11:
5:
1189:
1187:
1179:
1178:
1173:
1163:
1162:
1156:
1155:
1153:
1152:
1147:
1142:
1137:
1132:
1127:
1122:
1117:
1112:
1107:
1102:
1097:
1092:
1087:
1082:
1077:
1072:
1067:
1062:
1057:
1052:
1047:
1042:
1036:
1034:
1030:
1029:
1027:
1026:
1021:
1016:
1014:Inchworm motor
1011:
1006:
1001:
996:
991:
986:
984:Circle diagram
981:
975:
973:
972:Related topics
969:
968:
966:
965:
960:
955:
949:
947:
943:
942:
940:
939:
934:
929:
924:
922:Barlow's wheel
919:
914:
908:
906:
901:
898:
897:
895:
894:
889:
884:
879:
878:
877:
876:
875:
873:Vector control
870:
855:
850:
849:
848:
846:Cycloconverter
837:
835:
829:
828:
826:
825:
820:
815:
810:
805:
800:
795:
790:
785:
780:
775:
770:
765:
760:
755:
750:
749:
748:
743:
738:
733:
723:
722:
721:
716:
711:
710:
709:
704:
699:
694:
678:
676:
670:
669:
667:
666:
661:
655:
653:
647:
646:
644:
643:
638:
633:
628:
623:
618:
613:
611:Damper winding
608:
603:
598:
593:
588:
582:
580:
576:Components and
575:
572:
571:
569:
568:
562:
556:
554:Direct current
550:
543:
540:
539:
534:
532:
531:
524:
517:
509:
503:
502:
495:
494:External links
492:
489:
488:
459:
438:
417:
403:
382:
368:
348:
327:
306:
280:
279:
277:
274:
261:Main article:
258:
255:
249:
246:
238:
235:
221:
218:
212:
209:
188:
185:
175:
172:
113:rotating tanks
15:
13:
10:
9:
6:
4:
3:
2:
1188:
1177:
1174:
1172:
1169:
1168:
1166:
1151:
1148:
1146:
1143:
1141:
1138:
1136:
1133:
1131:
1128:
1126:
1123:
1121:
1118:
1116:
1113:
1111:
1108:
1106:
1103:
1101:
1098:
1096:
1093:
1091:
1088:
1086:
1083:
1081:
1078:
1076:
1073:
1071:
1068:
1066:
1063:
1061:
1058:
1056:
1053:
1051:
1048:
1046:
1043:
1041:
1038:
1037:
1035:
1031:
1025:
1022:
1020:
1017:
1015:
1012:
1010:
1007:
1005:
1002:
1000:
997:
995:
992:
990:
987:
985:
982:
980:
977:
976:
974:
970:
964:
961:
959:
956:
954:
951:
950:
948:
944:
938:
935:
933:
930:
928:
925:
923:
920:
918:
915:
913:
910:
909:
907:
899:
893:
890:
888:
885:
883:
880:
874:
871:
869:
866:
865:
864:
861:
860:
859:
856:
854:
851:
847:
844:
843:
842:
839:
838:
836:
834:
830:
824:
821:
819:
816:
814:
811:
809:
808:Piezoelectric
806:
804:
803:Electrostatic
801:
799:
796:
794:
791:
789:
786:
784:
781:
779:
776:
774:
771:
769:
766:
764:
761:
759:
756:
754:
751:
747:
744:
742:
739:
737:
734:
732:
729:
728:
727:
724:
720:
717:
715:
712:
708:
705:
703:
700:
698:
695:
693:
690:
689:
688:
685:
684:
683:
680:
679:
677:
675:
671:
665:
662:
660:
657:
656:
654:
652:
648:
642:
639:
637:
634:
632:
629:
627:
624:
622:
619:
617:
614:
612:
609:
607:
604:
602:
599:
597:
594:
592:
589:
587:
584:
583:
581:
573:
567:
563:
561:
557:
555:
551:
549:
545:
544:
541:
537:
530:
525:
523:
518:
516:
511:
510:
507:
501:
498:
497:
493:
478:on 2016-11-24
477:
473:
469:
463:
460:
456:
455:0-470-85102-3
452:
448:
442:
439:
427:
421:
418:
413:
407:
404:
400:
399:0-240-80631-X
396:
392:
386:
383:
378:
372:
369:
358:
352:
349:
337:
331:
328:
317:. Uea-inc.com
316:
310:
307:
296:on 2013-05-27
295:
291:
285:
282:
275:
273:
271:
264:
256:
254:
247:
245:
243:
236:
234:
226:
219:
217:
210:
208:
205:
200:
198:
194:
186:
184:
182:
173:
160:
159:hydroelectric
155:
151:
149:
145:
141:
136:
134:
133:ferris wheels
130:
126:
122:
118:
117:power shovels
114:
110:
106:
102:
98:
94:
93:wind turbines
90:
86:
82:
78:
74:
70:
66:
62:
58:
53:
51:
47:
43:
39:
35:
31:
21:
630:
480:. Retrieved
476:the original
472:PowerbyProxi
471:
462:
446:
441:
430:. Retrieved
420:
406:
390:
385:
371:
360:. Retrieved
351:
340:. Retrieved
338:. PeterLaper
330:
319:. Retrieved
309:
298:. Retrieved
294:the original
284:
266:
251:
240:
231:
214:
204:rotary union
201:
190:
177:
137:
72:
68:
64:
60:
56:
55:Also called
54:
29:
27:
927:Lynch motor
692:Shaded-pole
578:accessories
174:Composition
89:alternators
1165:Categories
823:Axial flux
813:Ultrasonic
788:Servomotor
768:Doubly fed
763:Reluctance
659:Alternator
651:Generators
621:Field coil
606:Commutator
566:commutated
564:SC - Self-
482:2016-11-24
432:2011-09-02
412:"mercotac"
362:2013-03-01
342:2013-01-24
321:2011-09-02
300:2011-09-02
276:References
193:commutator
161:generator;
144:electrical
129:heliostats
103:including
65:collectors
1140:Steinmetz
1055:Davenport
853:Amplidyne
753:Universal
731:Homopolar
719:Repulsion
631:Slip ring
127:systems,
125:telemetry
30:slip ring
1145:Sturgeon
1075:Ferraris
1060:Davidson
882:Metadyne
798:Traction
746:Unipolar
726:DC motor
682:AC motor
586:Armature
457:page 521
50:rotation
24:example.
1135:Sprague
1130:Siemens
1105:Maxwell
1070:Faraday
1019:Starter
958:Railgun
953:Coilgun
793:Stepper
641:Winding
242:Mercury
211:History
181:brushes
69:swivels
42:signals
1125:Saxton
1110:Ørsted
1095:Jedlik
1090:Jacobi
1080:Gramme
1045:Barlow
1033:People
858:Drives
773:Linear
674:Motors
636:Stator
453:
397:
97:analog
32:is an
1150:Tesla
1120:Pixii
1085:Henry
1050:Botto
1040:Arago
626:Rotor
596:Brush
558:PM -
552:DC -
546:AC -
220:Types
148:motor
71:, or
38:power
1115:Park
1100:Lenz
818:TEFC
451:ISBN
395:ISBN
105:data
83:for
131:or
99:or
1167::
470:.
150:.
135:.
123:,
119:,
115:,
111:,
79:,
67:,
63:,
59:,
28:A
528:e
521:t
514:v
485:.
435:.
414:.
379:.
365:.
345:.
324:.
303:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
