Abstract: A linear and rotary electromagnetic device particularly adapted as a linear and rotary stepper or stepper motor. A cylindrical movable member or armature is provided which is mounted for both axial movement and for angular movement about its axis. The armature member has teeth on its surface formed in both axial rows and in circumferential alignment or rows. Stator means having poles with windings associated with the poles is provided, the stator means having a central opening in which the movable armature member is mounted for axial and angular movement. By energizing certain angularly spaced windings, the movable armature member may be caused to rotate. By energizing axially spaced windings, the movable member of armature can be caused to move axially. Simultaneous angular and axial movement is achieved by energizing appropriate windings.

Abstract: Safety arming solenoid for use with missiles. Pivoted jaw means retain the end of an arming wire or cable that connects to the missile. A solenoid controls opening of the jaw means. The solenoid is a rotary type having a stem with an end part positionable angularly to restrain the jaws against opening or to release them. In a modified form, a second coil is provided whereby the solenoid armature has linear as well as angular motion for actuating the jaws in response to linear movement.

Abstract: A motor comprising a permanent magnet rotor, a plurality of stationary stator windings around the rotor, and an electromagnetic commutator for sequentially energizing and deenergizing the windings. The commutator includes a stationary transformer including a primary winding and a plurality of secondary windings equal in number to the number of stationary stator windings. The primary and secondary windings may be in the form of conductive patterns on printed circuit boards. An oscillator supplies a high frequency A.C. signal to the transformer primary. An apertured shield located between the primary and secondary windings rotates with the rotor and causes the secondary windings to be energized in sequence. Switch means, which may be transistors associated with the stationary stator windings are closed and opened in sequence, in response to energization and deenergization of the transformer secondary windings, in order to energize and deenergize the stationary windings in sequence.