Low cost north seeking gyro

摘要

A gyro comorises a gyro rotor with a horizontally alignable spinning axis, a first frame in which the gyro rotor is mounted, a second frame or pendulum in which the first frame is pivotally mounted about an axis, the second frame or oendulum being, in turn, pivotally mounted from a Cardan joint in a casing and whose axis of rotation is vertically alignable. A vertical alignment magnetic device is for vertical alignment of the second frame or pendulum.A follow up device has a pick-off for the angular position of the first frame relative to the second frame or oendulum and a stepping motor for follow up of the second frame or pendulum as a function of the pick-off signal. Thestepping motor serves at the same time as an angular position sensor for the second frame or pendulum