LINEAR ACTUATOR

摘要

A linear actuator has a stator with two stator coils and pole plates forming stator poles. A rotor is rotatably mounted to interact with the stator poles. The rotor has a hollow cup shaped permanent magnet fitted to a screw shaft. An output shaft, which is co-axial with the rotor, is driven by the rotor through a screw connection. The rotor is supported by a single rotary bearing located within the magnet, axially between axial ends of the permanent magnet.

主权项

1. A linear actuator, comprising:
a cylindrical housing having a first end and a second end; a first end cap attached to the first end of the cylindrical housing; a second end cap attached to the second end of the cylindrical housing; a stator attached to the cylindrical housing; a rotor rotatably interacting with the stator and comprising a hollow cup shaped permanent magnet and a screw shaft fixed to the hollow cup shaped permanent magnet and having a threaded end and a distal end; an output shaft co-axial and in screw coupling with the threaded end of the screw shaft, and extending through the first end cap; a bearing holder fixed to the cylindrical housing and having an end extending into the hollow cup shaped permanent magnet; a bearing attached to the end of the bearing holder within the hollow cup shaped permanent magnet to support the screw shaft; a load ball abutting the distal end of the screw shaft; a thrust bearing having a concave contact surface in contact with the load ball; and a spring attached to the second end cap and axially urging the thrust bearing towards the load ball.