Compact electric linear actuator with tubular rotor

Details Compact electric linear actuator with tubular rotor Compact electric linear actuator with tubular rotor

1990-10-16

1992-03-24

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

744248R, H02K 706

Patent

active

050991612

ABSTRACT:
A compact electrically driven linear actuator having an electric motor in a housing. The electric motor has a cylindrically-shaped rotor assembly which is attached to and circumscribes a threaded spindle. A portion of the threaded spindle is received in an axial bore of a non-rotatable extendable arm. A nut attached to one end of the non-rotatable extendable arm is threadably received on the threaded spindle. Rotation of the threaded spindle by the electric motor linearly displaces the nut and the non-rotatable extendable arm along the length of the threaded spindle. In the preferred embodiment, the threaded spindle has a helical ball groove and the nut is a mating ball nut.

REFERENCES:
patent: 3660704 (1972-05-01), Paine et al.
patent: 4521707 (1985-06-01), Baker
patent: 4560894 (1985-12-01), Stoll
patent: 4614128 (1986-09-01), Fickler
patent: 4679451 (1987-07-01), Nakamura
AC SERVOMOTORS hollow shaft, GE Fanuc Automation, GmbH, appeared in IEN Magazine in England before Oct. 1990.

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