Abstract: A blocking oscillator for a reciprocating electromagnetic actuator having a solenoid coil, a detection coil for generating a control signal in response to a charge in the magnetic field generated by the solenoid coil, a silicon Darlington amplifier responsive to the control signal to control the current through said solenoid coil, and a diode connected in series with the collector of the Darlington amplifier rendering the Darlington amplifier immune to reverse voltage and transient signals.

Abstract: A drive means comprising a movable part and a fixed part provided with a stator winding and a magnet yoke with a magnetic gap. A soft-iron magnetic portion is arranged in the magnetic gap. A current generator generates a first current for a stator winding and a second current for another stator winding, the sum of the magnitudes of the two currents being constant. The reluctance effect causes each of two soft-iron magnetic portions to be pulled into an individual magnetic gap driven by one of the two currents. The two reluctance forces vary quadraticly with the two currents, but due to the fact that the net force is the difference between them, this net force will be linearly dependent on the currents. It is suitable to allow the two currents to come from the same amplifier stage, which is push-pull coupled.

Abstract: An electromagnetic motor with a piston coil supported on a shaft between the field coils, the shaft being slideably supported in the frame so that the piston coil is moveable between the field coils. The piston coil is in electrical connection with the power source and has a constant magnetic polarity. The field coils and piston coil all are wound in the same direction. The shaft supporting the piston coil is pivotally connected to a crankshaft. The magnetic distributor switches are activated by rotation of the rotor in response to movement of the piston to maintain the field coils at opposite polarities and to reverse the polarities of the field coils at the end of each stroke of the piston, the piston having a two stroke cycle. The field coils also include secondary coils to recover energy from the primary coils by induction. A pulser is provided electrically intermediate the power source and the field coils to supply pulsed current to the field coils.

Abstract: Apparatus for providing movement includes an electromagnet. The time required to attain a given value of current flow in a magnet coil is shortened by initially providing a higher voltage to attain quickly the desired current flow, and then providing a lower voltage.

Abstract: A linear motor for driving a dot printer head includes a carriage carrying print head. The carriage is displaced by a drive system on a linear guide rail. The drive system is a linear motor having an armature wound on a support situated on the carriage. The motor includes an armature winding in a magnetic circuit including the rail.

Abstract: An electromagnetically actuated, linear reciprocating self-timed motor employs plural reciprocating electromagnet pistons which oscillate between opposed fixed electromagnets having primary and secondary coils. The fixed electromagnets are alternately energized to effect large repulsion forces between the fixed electromagnets and the reciprocating electromagnet pistons. Secondary coils carried by the fixed electromagnets cause electrical energy induced therein during reciprocation of the pistons to be fed back to the d.c. source supplying energy to the primary coils of the fixed electromagnets. A crankshaft driven rotor bearing permanent magnets develop signals within stationary pick-up coils for controlling switches for timed energization of the primary coils of the fixed electromagnets.

Abstract: A rotary actuator comprise a stator defining a cylindrical space and formed with a pair of diametrically opposite main magnetic poles adapted to be magnetized to the same polarity, a pair of drive coils disposed on the main poles, a drive circuit for energizing the drive coils, and a rotor having a plurality of pairs of magnetized zones separated by non-magnetized zones, all disposed around the circumference of the rotor, adjacent magnetized zones being of opposite polarities.

Abstract: The drawings illustrate the principles involved in an inertial shuttle device originally constructed to operate as an optical character recognition device and adapted to rapid photocomposition.The shuttle is a scanning device which is inherently a very uniform and smooth scanning velocity device and utilizes only a minute amount of driving power. This combination is achieved by means of energy conserving springs which reverse the head very rapidly at the end of each stroke with windage and friction losses made up by a lightweight, low inertia drive motor which itself is variable in power input by alteration of current intensity supplied to the motor.

Abstract: An electromagnetic device comprises an annular stator and a movable armature having a cylindrical outer surface, located within the stator, the stator having a thread formation consisting of a pair of helical grooves and the armature having at least two thread formations each consisting of a pair of helical grooves of the thread formations being of the same helix angle, the thread formation on the stator having a winding set comprising windings in each of the grooves of the formation, the direction of current flow in the windings being in the opposite direction whereby when electric current is past through the windings relative movement of the stator and armature will take place to reduce the reluctance of the magnetic paths between the parts.

Abstract: In the manufacture of semiconductor components thin films of submicron thickness are in widespread use. To produce the submicron thick films free of entrapped pockets of air, a platform, to which a substrate surface is mounted, is initially caused to oscillate in a shaking motion to produce a shearing force to lift minute pockets of air trapped at the liquid-substrate interface to permit migration to the surface of the liquid where they escape. This initial oscillating operation is provided by a permanent magnet A-C motor driven as a synchronous motor by the output of a frequency generator. The motor control circuit, including the frequency generator, energizes the A-C motor to initially cause the oscillating motion of the platform (chuck) carrying the substrate surface. After the initial time period of oscillating motion, the control circuit provides a high frequency signal to the motor for high speed rotation in one direction to produce a drying action to the thin, film-forming liquid.

Abstract: A completely sealed magnetically driven pump having a piston armature driven by electrical windings. Unique electrical driving circuits are provided for the pump embodying feedback windings magnetically coupled with the driving windings of the pump for controlling the reciprocation. The drive circuits are such as to facilitate driving rates, embodying particularly solid state bistable flip-flop components adaptable to be embodied in or associated with computers or other low power logic devices.