Abstract: Linear direct drive motor includes a pair of axially spaced, relatively fixed stator poles and an armature mounted on a motor shaft for axial movement between the stator poles. The ends of the motor shaft are supported by centering springs which permit axial movement of the shaft and thus the armature relative to the stator poles. Positive stops are located between the stator and stator poles for preventing armature overtravel. Extending between the stator poles is a sleeve member which supports a ring magnet in radially spaced relation from the armature. Adjacent opposite ends of thee ring magnet are a plurality of layers of electrical coils, with the layers adjacent one end of the magnet being paired with different layers at the other end to provide redundant electrical channels and symmetric motion behavior.

Abstract: A two-pole limited angle torque motor including a rotor assembly having one or more permanent rotor magnets and a stator assembly including a stator coil and a pair of circumferentially spaced stator pole structures. Each pole structure includes a generally axially extending stator pole blade about which the stator coil circumferentially extends. A radially outwardly extending flange is at one end of one of the stator pole structures and at the opposite end of the other stator pole structure. The stator pole blades have a greater radial thickness adjacent the flanges thereof than at the opposite end of the blade to reduce the magnetic flux density of the stator pole structures in the region of the blades adjacent the flanges thereof. Also, the axial outer end faces of the flanges desirably protrude axially outwardly adjacent the radial inner ends thereof to make use of the fringing fields of the rotor magnet at the ends of the rotor assembly to increase the reluctance torque of the motor.

Abstract: A mechanism for operating an instrument such as, for example, a gauge primarily for measuring pressure having a diaphragm the opposite faces of which are subject to a pressure differential so that the center moves in response to such differential. The diaphragm movement is transmitted to an array of bar magnets that moves in a substantially rectilinear translative movement in response to diaphragm movement. A rotary magnet spaced from the path of movement of the array of bar magnets and within the composite magnetic field produced by the array rotates as the array is translated, the angular rotation being a predetermined mathematical or empirical function of the amount of translation and built into the array. The mathematical function is achieved by proper choice of magnet dimensions and placement thereof relative to one another. Rotation of the rotor is used to drive a pointer indicator over a scale to indicate pressure.