Abstract: A single-axis servoed rate gyroscope has a sealed gimbal assembly that is mounted by bearings for angular displacement about a rotational axis, at right angles to the gyroscope spin axis. The gyroscope torquer comprises a circular, cylindrical coil mounted at the bottom of the gimbal assembly, coaxially of the spin axis and below the rotational axis. The coil extends in an annular gap formed between a cylindrical permanent magnet, mounted on the gyroscope base structure, and a part of the base structure which surrounds the magnet and which provides a magnetic return path. The magnet is polarized at right angles to the spin axis and the rotational axis, so that energization of the coil causes a restoring torque on the gimbal assembly about the rotational axis. The bearings are located in V-shape slots formed in the base structure surrounding the gimbal assembly.

Abstract: An accelerometer has a tubular coil that surrounds coaxially a cylindrical magnet. The magnet is polarized along a second axis transversely of the common axis of the coil and magnet. A sleeve of soft-iron surrounds the magnet and coil to provide a magnetic return path, the sleeve having two vertical slots which receive bearings. The bearings are carried by a shaft that extends across and above one end of the coil so that the coil is supported for angular displacement about a third axis orthogonal with the common axis and the second axis and displaced from the second axis. An optical pick-off mounted below the other end of the coil is used to sense rotation about the third axis, by detecting displacement of a portion of the former on which the coil is wound.

Abstract: A gyroscope inertia ring torquer has an inertia ring formed of an annular sleeve of magnetic material around which are mounted two annular permanent magnets. The permanent magnets produce radially directed fields of opposite polarities. The torquer also has four fixed electrical coils equally spaced outwardly of the inertia ring around a portion of the gyroscope casing, of a magnetic material. The coils are arranged, when energized, to produce radial magnetic fields which interact with the fields produced by the permanent magnets and thereby apply a restoring torque to the inertia ring. The permanent magnets are spaced from one another such that the torque produced by the interaction of the magnets with the casing is a minimum.