Electrostatically suspended rotor for angular encoder

Details Electrostatically suspended rotor for angular encoder Electrostatically suspended rotor for angular encoder

1989-08-21

1990-10-23

Albrition, C. L.

Electric heating

Metal heating

By arc

B23K 2600

Patent

active

049654292

ABSTRACT:
Apparatus for engraving a code strip with coded markings is disclosed. The code strip is attached for rotation to a cylindrical rotor which is mounted within the cavity of a stator. The stator carries electrodes on its top and side walls to which high potentials are applied to electrostatically suspend the rotor. Circuit means sense the position of the rotor with respect to the stator electrodes and adjust the potential to maintain the rotor at its desired location. A drive motor is connectable to the rotor through a drive shaft to initially lift the rotor into the desired location within the stator and to rotate it at the desired speed. Thereafter, the drive shaft is disconnected from the rotor, and the rotor continues to spin at a highly stable angular velocity, supported only by the electrostatic fields.

REFERENCES:
patent: 3262327 (1966-07-01), Cohen
patent: 3845995 (1974-11-01), Wehde
patent: 3902374 (1975-09-01), Hoffman, et al.
patent: 4038663 (1977-07-01), Day
patent: 4406939 (1983-09-01), Golker
patent: 4587860 (1986-05-01), Audren
patent: 4610172 (1986-09-01), Mickle
patent: 4862752 (1989-09-01), Hort

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