Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1996-10-09
1997-10-21
LaBalle, Clayton E.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 90, H02K 708, H02K 709
Patent
active
056799926
ABSTRACT:
A magnetic bearing unit is disclosed which comprises a rotor supported in a radial direction by magnetic effects generated by permanent magnets arranged within a passive radial magnetic bearing and supported in an axial direction by an actively-controlled axial magnetic bearing. The unit also comprises a movable member arranged between the stator and rotor, and the passive magnetic member is arranged between the movable member and the rotor. At least first and second pairs of axially opposing faces are provided on the stator and the movable member respectively. A biasing means is in functional association with the movable member for forcing the movable member to shorten a spacing between the first pair of opposing faces. The first pair of opposing faces is formed with a recess having a curved cross sectional shape on each of the opposing faces, and a plurality of balls having a radius not more than a radius of the recess are disposed in the recess. The second pair of opposing faces are bridged with a damping member made of an elastic material. The resulting bearing unit in such a compressive state can be used in any orientation without causing any operational problems such as those encountered when the conventional magnetic bearing is used in a horizontal orientation. The unit is easy to control and produces stable smooth operation in radial and axial directions at all times.
Aiyoshizawa Shun-ichi
Miyamoto Matsutaro
Nakazawa Toshiharu
Ebara Corporation
LaBalle Clayton E.
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