Linear actuator

Details Linear actuator Linear actuator

1989-05-14

1990-09-04

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 83, 744248R, H02K 706

Patent

active

049547356

ABSTRACT:
A linear actuator has a screw threaded shaft mounted so that it is restrained from rotational movement, a cage is mounted in sliding relationship on the shaft and an internally threaded member is mounted at one end of the cage in a spherical bearing. The threadform of the internally threaded member is similar to that of the shaft but of larger diameter. The internally threaded member has a skirt formation which extends towards the other end of the cage, a circumferential portion of the skirt formation being made of ferromagnetic material. A series of angularly spaced coils are provided around the cage adjacent the ferromagnetic portion of the skirt formation, the coils being adapted to be energized sequentially so that they will attract the ferromagnetic portion of the skirt formation and cause the internally threaded member to skew so that the threads thereof engage the threads of the shaft, sequential energization of the coils causing the point of contact of the thread of the internally threaded member and shaft to move round thus causing relative rotation and axial movement therebetween.

REFERENCES:
patent: 2556572 (1951-06-01), Brinkhurst
patent: 3456139 (1969-07-01), Newell
patent: 4412794 (1983-11-01), Presley

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