Browse Prior Art Database

Electric Grounding Device for Rotating Machinery

IP.com Disclosure Number: IPCOM000100556D
Original Publication Date: 1990-May-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 67K

Publishing Venue

IBM

Related People

Engwall, M: AUTHOR

Abstract

Disclosed is a device for the purpose of providing electric contact, such as grounding, between rotating and stationary assemblies of rotating machinery. The preloading required to maintain the contact is provided by magnetic forces rather than by a material spring.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 56% of the total text.

Electric Grounding Device for Rotating Machinery

       Disclosed is a device for the purpose of providing
electric contact, such as grounding, between rotating and stationary
assemblies of rotating machinery.  The preloading required to
maintain the contact is provided by magnetic forces rather than by a
material spring.

      Referring to the figure, a typical embodiment features a
smooth- bored sleeve B in which the grounding button G can move
freely axially.  The force necessary to ensure sufficiently large
contact pressure between G and the mating contact R is provided by
the permanent magnets M and N, attached to the grounding button and
the end of the sleeve, respectively.

      The axes of the component parts all coincide with the
rotational axis of the machine.  The directions of magnetic
polarization of the two magnets are opposed but parallel to this
axis.

      The grounding button and sleeve are made of conductive
materials.  One of the mating contact surfaces of G and R is crowned,
the other surface flat.  Either the grounding button assembly is part
of the rotor, and the contact R stationary, or vice versa.

      The electric path traces its way from R through the rotating
contact, into G, and through the line contact between G and the
sleeve B, into B.

      A major advantage of this device is the much smaller
variability in contact force as a function of axial displacement
between stationary and rotating contacts compared...