Low friction, high precision actuator

Details Low friction, high precision actuator Low friction, high precision actuator

1997-06-27

1999-11-23

Enad, Elvin G.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 12, 310 905, 310103, 744248R, H02K 706, H02K 4100, H02K 709, F16H 118

Patent

active

059905875

ABSTRACT:
In one embodiment, a device for generating ultra-high precision rectilinear movement based on aerostatic suspension and magnetic traction, the device including a nut, a leadscrew, a thrust bearing, a contactless motor, and feedback drive electronics. The contactless motor provides the actuation by turning the leadscrew which is made of magnetically soft materials and has a pitched helical groove machined on its surface. The leadscrew passes through the core of the nut which is free to move in a rectilinear motion on a aerostatically suspended guide. The nut, also made with magnetic material, has a matching helical groove in its core so that a closed magnetic circuit is formed between the grooves of the leadscrew and the nut. The closed circuit in turn provides the necessary magnetic traction to move the nut in a rectilinear fashion. A primary aerostatic suspension is utilized to stabilize and center the leadscrew and nut transversally. A secondary transversal stabilization is provided by the thrust bearing to center the leadscrew in the axial direction. The nut is vibrationally isolated and can be rectilinearly moved with precision. Thus, all surface friction is eliminated, thereby reducing friction to that generated by air.

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