Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1995-06-07
1999-11-16
Dougherty, Thomas M.
Electrical generator or motor structure
Dynamoelectric
Rotary
F16C 2700
Patent
active
059863722
ABSTRACT:
Several aspects: (1) a wobble-absorbing magnetic bearing ("WAMB") has driving/driven surfaces, and magnetically clamped between them e. g. balls for free motion in one or more directions. A groove (preferably V-) in at least one surface guides the balls to limit motion as to one degree of freedom so the bearing transmits torque. (2) a WAMB system for a precision drive that transmits torque through a wobble absorber to move an object, guarded from transmitted-torque effects. Motion due to torque is best shunted to a passive surface using a partially floating member moved laterally by the motion, balls between floater and surface, and a magnet to clamp floater against surface, through the balls. (3) a torque-transmitting WAMB has unmagnetized bearing surfaces, with balls between for free motion of the surfaces in one direction; a magnet separate from all the surfaces and balls clamps the balls firmly between the surfaces. (4) a torque-transmitting WAMB with bearing surfaces, and balls between for free motion of the surfaces in one direction. At least one surface or ball is magnetized to clamp balls in place. A separate magnet augments firm clamping. (5) a WAMB without ferrolubricant, but with mutually facing bearing surfaces and between them permanent-magnet balls (best ceramic) for free motion of the surfaces in at least one direction. (6) a WAMB system to transmit force/torque but suppress lateral motion. Permanent-magnet balls, constrained against rolling through more than about 70.degree., between facing bearing surfaces permit smooth motion in at least one direction.
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