Browse Prior Art Database

Non-Contact Magnetic Gear Drive

IP.com Disclosure Number: IPCOM000102890D
Original Publication Date: 1990-Mar-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 51K

Publishing Venue

IBM

Related People

Schaefer, JO: AUTHOR

Abstract

Disclosed is a virtual gear drive mechanism comprising multiple magnetic gear assemblies. These gear assemblies further comprise shaft (1), magnet rotor (2) and hub (3). The assemblies are maintained in spaced operating relationship and out of contact with one another by frame members (4). The frame members are supported on base (5). View (B) shows a gap between magnet rotor members (2) which is typically .2 mm.

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Non-Contact Magnetic Gear Drive

      Disclosed is a virtual gear drive mechanism comprising multiple
magnetic gear assemblies.  These gear assemblies further comprise
shaft (1), magnet rotor (2) and hub (3). The assemblies are
maintained in spaced operating relationship and out of contact with
one another by frame members (4).  The frame members are supported on
base (5). View (B) shows a gap between magnet rotor members (2) which
is typically .2 mm.

      The "gear teeth" are magnetic poles on a multi-pole rotor (2),
similar to that found in a conventional PM stepper motor.  Input at
any one of the shafts (1) results in a gear-like output at the other
shafts.

      Mating magnetic gear assemblies of different diameters and/or
numbers of poles can be used to change output torque and shaft
velocity within a limited range.

      Multi-pole rotational and linear elements may also be combined
in rack-and-pinion fashion for non-contact operation.

      It is also possible to employ an electrically changeable pole
configuration on at least one magnetic gear assembly such that the
system drive ratio can be changed within some range during operation
by changing the number of poles.  An example of an electrically
changeable magnet would be a wound rotor with a selectable winding
configuration.

      If the load torque exceeds the design torque in this
non-contact drive system, the associated magnetic gear assemblies
will jump poles and slip.  This ...