Actuator including mechanism for converting rotary motion to linear motion

Abstract

An active vibration control device is provided that is configured to control the position of a body relative to a reference frame. The control device includes sensors that provide input signals corresponding to movement of the body in at least one direction, a rotary motor configured to control the position of the body, and four-bar linkage connecting the rotary motor to the body. The linkage converts the rotary motion output from the motor into a linear motion of the body. The controller, based on the input signals from the reference frame sensors, provides control signals to the rotary motor which acts through the linkage to position the body in the at least one direction relative to the position of the reference frame.

Description

Background technique [0001] Active vibration control systems have been employed to control vehicle seat vibrations. For example, as an alternative to passive systems (which include springs and dampers that reduce the seat response to vehicle vibrations), active vibration control systems detect seat vibrations and control the position of the seat to counteract the detected motion and thereby align the seat with the seat. Vehicle vibration isolation. Such active vibration control systems may include linear actuators controlled by a controller. A linear actuator is positioned under the seat to control the position of the seat relative to the vehicle frame. For example, a linear actuator may comprise a linear electromagnetic motor comprising an armature fixed at one end to the seat. The armature extends linearly and retracts relative to the stator based on a control signal from the controller, thereby positioning the seat. [0002] Controlled linear actuators have applications...

AI Technical Summary

Problems solved by technology

Other challenges include known cost and maintenance issues associated with linear motors

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