Levitated micromotor

Details Levitated micromotor Levitated micromotor

1991-12-19

1993-02-16

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310309, H02K 700, H02N 100

Patent

active

051873990

ABSTRACT:
An electrostatically levitated micromotor is described that includes a generally planar rotor that exhibits an axis of symmetry and includes electrically conductive portions. A balanced stator arrangement is positioned adjacent the rotor and is connected to multi-phase circuitry for enabling the rotation of the rotor about its symmetry. A plurality of levitating electrodes are positioned about the rotor and circuitry is connected thereto for forming resonant circuits that include the conductive portion of the rotor and exhibit a natural resonant frequency. A power source energizes the resonant circuits at a frequency greater than the natural frequency and thereby enables stable levitation of the rotor.

REFERENCES:
patent: 4736127 (1988-04-01), Jacobsen
patent: 4943750 (1990-07-01), Howe et al.
patent: 5015906 (1991-05-01), Cho et al.
"Electric Levitation Bearings for Micromotors", Suresh Kumar and Dan Cho, Digest of Technical Papers, IEEE International Conference on Solid State Sensors and Actuators, pp. 882-885, 1991.
"A Proposal for Electrically Levitating Micromotors", S. Kumar and Cho, Sensors and Actuators, vol. 24, 1990, pp. 141-149.

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