Drive For Hermetically Sealed Disk File
Original Publication Date: 1979-Aug-01
Included in the Prior Art Database: 2005-Feb-20
The figure illustrates a variable torque coupling arrangement for rotating a shaft in a sealed enclosure. The variable torque coupling arrangement comprises an axial gap synchronous magnetic coupling 13 consisting of magnets 14 and 15 and diaphragm 16. Magnet 14 is mounted to shaft 11 and rotates therewith, while magnet 15 is pivotally attached to a slotted guide member 18 by means of dowl pins 19. Guide member 18 is attached to one end of motor shaft 21 of motor 20. Magnet 15 can move axially relative to guide member 18 in the direction of arrows 22 so that the spacing of the magnet 15 relative to the diaphragm 16 is controlled by a counter-weight assembly 25.