Position sensing device with rotary to linear magnification

摘要

A device and method for measuring the rotational position of a rotating feature, the device employing rotary to linear magnification. A connecting member is operatively connected to the rotating feature, the connecting member extending through one or more structural layers of an enclosure. An arm is operatively connected to the connecting member and located outside the enclosure. A target is arranged with respect to a position sensor, with the position sensor configured to measure the linear position of the target with respect to the position sensor. A cable is connected to the arm at an attachment point, the cable also being connected to the target. One or more pulleys are arranged to control the path of the cable between the attachment point on the arm and the target.

主权项

1. A position sensing device for measuring a rotational position of a rotating feature arranged in a harmful environment, comprising:
a connecting member operatively connected to the rotating feature, the connecting member arranged to rotate with the rotation of the rotating feature, the connecting member extending through one or more structural layers of an enclosure, a portion of the connecting member arranged within the harmful environment, an amplifying arm operatively connected to the connecting member outside the enclosure to amplify rotational motion of the rotating feature, a position sensor and a target arranged with respect to the position sensor, the position sensor configured to measure the linear displacement of the target with respect to the position sensor; a cable connected to the amplifying arm at an attachment point, the cable also being connected to the target; one or more pulleys arranged to control the path of the cable between the attachment point on the amplifying arm and the target; and at least one stop positioned relative to the amplifying arm to constrain angular movement of the amplifying arm; wherein the rotational position of the rotating feature is calculated based on the measured linear displacement of the target.