Bearingless ultrasound-sweep rotor

Details Bearingless ultrasound-sweep rotor Bearingless ultrasound-sweep rotor

1995-02-13

1997-06-03

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 40MM, 12866206, H02K 709, A61B 812

Patent

active

056357842

ABSTRACT:
An ultrasonic imaging device including a bearingless levitating rotor for rotating a reflective mirror. The device may be used to image from within a hollow object and is particularly suited for use in intravascular imaging. The levitation of the rotor is achieved by forming the rotor as a permanent magnet structure having three distinct magnet regions, two having opposing dipole moments axial to the rotor orientation and one having a dipole moment transverse to the rotor orientation, the transverse magnetic region lying between the first and third magnetic regions. The rotor is radially centered within a housing using passive magnetic suspension elements, including permanent magnet stators at opposite ends of the housing. The rotor is axially positioned within the housing with an active servo feedback controller. Position-drive and sense coils are used to move and detect the positioning of the rotor. Rotation drive coils operate on the transverse magnetic region to cause the rotor to spin. The combination of the magnetic components and the coil detection, positioning, and rotation mechanism yields an imaging device with a rotor having no direct mechanical linkages.

REFERENCES:
patent: 4025166 (1977-05-01), Felstead
patent: 4977898 (1990-12-01), Schwarzschild
patent: 5115814 (1992-05-01), Griffith
patent: 5240003 (1993-08-01), Lancee
patent: 5271402 (1993-12-01), Yeung
patent: 5282472 (1994-02-01), Companion et al.
patent: 5294854 (1994-03-01), Trumper
patent: 5313950 (1994-05-01), Ishikawa
patent: 5345127 (1994-09-01), New
patent: 5543673 (1996-08-01), Katsumata et al.

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