Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1994-08-12
1997-01-28
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 67R, 310 90, 310156, 360 9807, 360 9904, 360 9908, H02K 709, G11B 1702
Patent
active
055980481
ABSTRACT:
An apparatus for rotatably journaling a rotor of a flat spindle motor about a stator comprising a spindle magnet disc disposed on the rotor assembly of the flat spindle motor and journaled about the spindle motor shaft having a disc shaped first magnetized region with an outer radius r comprised of a plurality of axial aligned poles, a disc shaped second region having an outer radius r2 (where r2>r) comprised of a single pole, and a disc shaped non-magnetized spacer region disposed there between. The integrated spindle magnet disc is disposed on the inside surface of a rotor over complementary axially aligned electromagnet poles which are disposed on the base of the stator assembly. A like aligned single pole is fixedly attached to the stator and disposed in opposition to the second magnetized region having like aligned pole of the integrated spindle permanent magnet. The single poles are disposed on both the rotor and stator in attraction mode with opposite poles facing one another, or in opposition mode with a complete or partial offset thereby forming a stable magnetic bearing for maintaining rotor displacement about the stator in conjunction with a conventional pivot. The stator base assembly is extended toward the first magnetized region to provide axial pre-load for the motor. The electromagnet poles further include a steel bobbin for increased flux density and added axial stiffness. Finally, eddy current generation means are disposed between the stator base and the like aligned single pole for improved dampening characteristics.
REFERENCES:
patent: 4211452 (1980-03-01), Poubeau
patent: 5223758 (1993-06-01), Kataoka et al.
patent: 5325006 (1994-06-01), Uno et al.
Dantam K. Rao, "Magnetic Bearing Concepts for Turbomolecular Pumps," Precision Magnetic Bearing Systems, Technical Bulletin No. C-1022, Jun. 1993.
Dunfield John C.
Oveyssi Kamran
Mullins Burton S.
Seagate Technology Inc.
Stephan Steven L.
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