Electricity: motive power systems – Reciprocating or oscillating motor – Energizing winding circuit control
Patent
1976-08-23
1978-02-28
Duggan, Donovan F.
Electricity: motive power systems
Reciprocating or oscillating motor
Energizing winding circuit control
310 36, 310 74, H02K 3312
Patent
active
040769984
ABSTRACT:
A bearing free oscillation motor has a stator component that defines a cylindrical cavity and a rotor component with a cylindrical portion disposed within the cavity and spaced from the cavity wall by an annular gap of radial width in the range of one-five percent of the diameter of the cylindrical portion. The rotor is supported for rotation about its axis by attachment to one end of a torsion shaft that is fixed at its other end to the stator. The motor may be of either the moving coil or the moving magnet type, that is a permanent magnet provides a magnetic field across the annular gap and electric current flow through a drive winding interacts with the magnetic field to produce a torque that rotationally deflects the rotor. Disposed in the annular gap between the stator and rotor is a low viscosity liquid that produces essentially no viscous damping, for example a hydrocarbon oil, a silicone oil or a polymeric liquid. The sheath of liquid in the annular gap provides radial rotor stability against magnetic, dynamic or other forces that tend to cause radial displacement of the rotor. Rotor damping is provided electrically by feedback of velocity signals proportional to the angular velocity of the rotor.
REFERENCES:
patent: 3149274 (1964-09-01), Hetzel
patent: 3156857 (1969-11-01), Herr et al.
patent: 3286109 (1966-11-01), Madsen
patent: 3389277 (1968-06-01), Fiore
patent: 3610973 (1971-10-01), Bauer et al.
patent: 3624574 (1971-11-01), Montagu
Duggan Donovan F.
General Scanning Inc.
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