[54] MAGNETICALLY INDUCED COUPLING AND DRIVE APPARATUS
[75] Inventors: Edward P. Furlani, Lancaster; Syamal K. Ghosh; Dilip K. Chatterjee, both of Rochester, all of N.Y.
[73] Assignee: Eastman Kodak Company, Rochester, N.Y.
[21] Appl. No.: 28,553
[22] Filed: Feb. 24, 1998
[51] Int. CI. H02K 49/06
[52] U.S. CI 310/103; 492/52; 492/53
[58] Field of Search 310/92, 90.5, 103,
310/114, 115; 74/DIG. 4; 492/52, 53, 54, 58, 59.8; 138/145, 146
[56] References Cited
U.S. PATENT DOCUMENTS
3,149,403 9/1964 Aurich et al 492/8
3,150,419 9/1964 Aurich 492/8
3,168,760 2/1965 Olcottt 492/8
3,520,747 7/1970 McGaughey 138/145
3,864,587 2/1975 Landry 310/103
4,069,570 1/1978 Pospisil et al 492/54
5,283,121 2/1994 Bordner 492/52
5,387,172 2/1995 Habenicht et al 492/50
A magnetically induced coupling and drive apparatus (10) useful, for instance, for conveying webs utilizes magnetically coupled first and second rotatable elements (20,32)and means for rotating one of the rotatable elements (20, 32) which causes the simultaneous synchronous rotation of the other rotatable element. Both first and second rotatable elements (20, 32) include a magnetic core (22, 34), a bonding layer (28, 36) at least partially surrounding the magnetic core (22, 34), and a wear and abrasion resistant layer (26, 32) surrounding the bonding layer (28, 36). The means for rotating (60) rotating one of the rotatable elements (20, 32) includes a ferromagnetic stator member (62) integrally associated with one of said first and second rotatable elements (28,36). The ferromagnetic stator member (62) has a plurality of spatially separated pole teeth (64a, 64fc, 64c, 64rf), wherein each of the pole teeth has an operably connected coil (66a, 66fc, 66c, 66rf) arranged for producing rotation of one of said first and second rotatable elements (20, 32) once the coil is energized.
17 Claims, 4 Drawing Sheets
