Magnetic radial bearing with flux boost

A magnetic bearing (320) comprising:

• a stator (24;
• 224) extending from a first end (30) to a second end (32) and comprising:
• one or more first permanent magnets (50);
• one or more second permanent magnets (52) axially spaced from the one or more first permanent magnets;
• a first end yoke (120) axially abutting the one or more first permanent magnets;
• a second end yoke (122) axially abutting the one or more second permanent magnets;
• a first end laminate (134A, 134B, 136A, 136B) encircled by the first end yoke;
• a second end laminate (138A, 138B, 140A, 140B) encircled by the second end yoke;
• one or more intermediate permanent magnets (60;
• 230;
• 232) axially between the one or more first permanent magnets and one or more second permanent magnets;
• a plurality of laminate teeth (64A, 64B, 66A, 66B) radially inward of the one or more intermediate permanent magnets;
• and
• a plurality of radial windings (34A, 34B, 36A, 36B) respectively encircling a respective associated tooth of the plurality of teeth;
• and
• a rotor (322) to be supported for rotation about an axis (502) and comprising:
• one or more third permanent magnets (150);
• one or more fourth permanent magnets (152) axially spaced from the one or more third permanent magnets;
• and
• a center laminate (178) axially between the one or more third permanent magnets and the one or more fourth permanent magnets.

A magnetic bearing comprising

• a rotor (22;
• 322) to be supported for rotation about an axis (502);
• a stator (224) extending from a first end (30) to a second end (32) and comprising:
• one or more first permanent magnets (50);
• one or more second permanent magnets (52) axially spaced from the one or more first permanent magnets;
• one or more intermediate permanent magnets (230;
• 232) axially between the one or more first permanent magnets and one or more second permanent magnets, wherein the one or more intermediate permanent magnets comprise one or more first intermediate magnets and one or more second intermediate magnets, wherein:
• the one or more first intermediate magnets (230) are between the one or more first permanent magnets (232) and the one or more second intermediate magnets (232);
• the one or more first intermediate magnets have polarities directed partially radially inward relative to polarities of the one or more first permanent magnets;
• and
• the one or more second intermediate magnets have polarities directed partially radially inward relative to polarities of the one or more second permanent magnets;
• a plurality of laminate teeth (64A, 64B, 66A, 66B) radially inward of the one or more intermediate permanent magnets;
• and
• a plurality of radial windings (34A, 34B, 36A, 36B) respectively encircling a respective associated tooth of the plurality of teeth.