A linear motor comprising prismatic inner yokes each constructed in a manner that a large number of sheets each having a generally rectangular configuration and having a high magnetic permeability are piled up each other and outer yokes each constructed in a manner that a number of sheets each having a generally rectangular configuration and having a high magnetic permeability are piled up each other. Each of coils is wound around a central portion of three magnetic pole portions of the outer yo...

The invention comprises a scalable, configurable "propulsor" system. A propulsor system is an assembly of individual propulsors that act in concert to form a substantially continuous control surface that undulates in a working fluid. Each propulsor is driven and configured by computer-controlled actuators so that the control surface undulates in various wave forms. Optional actuators that may refine the surface shape include an "orientation" actuator that drives rotation about the propulsor's lo...

A linear motor includes a stator including a stator core for forming plural magnetic poles and a magnetic wire mounted on the stator core, and a mover provided at the interior of the stator and including a mover core and a magnet mounted on the outer side of the mover core. The linear motor has the magnet have a reduced mass, thus having a small size, a low overall cost, and a high operating efficiency.

A power amplifier uses a modulation technique that varies amplitude of a drive signal and, optionally, phase angle of the drive signal. The power amplifier comprises two coupled amplifiers, a first one of which is operated saturated to produce a constant voltage output. The first amplifier is coupled to a second one of the amplifiers via a quarter wave transmission line. The second amplifier is operated in a linear mode to deliver an output signal controlled by an amplitude-modulating signal. Th...

An electromagnetic actuator is disclosed having a magnetic circuit which provides a plurality of annular, concentrically located air gaps and a plurality of annular actuator forms which are positioned in the air gaps. A winding is mounted on each of the forms and each winding is adapted when electrically energized to establish a field which reacts with a field of the magnetic circuit and causes rectilinear motion of the form in an axial direction. A single magnetic circuit is thereby provided fo...

A flowmeter of the fluid oscillator type having a fluid jet which oscillates at a frequency indicative of flow rate. A linear flow rate vs. frequency output characteristic is obtained by use of a fluid accelerating means in the form of a two-dimensional sharp edge orifice. The orifice has an aspect ratio selected to give a constant coefficient of discharge throughout an extended flow range including laminar and turbulent flow conditions.

A linear actuator of the threaded shaft actuator type comprising a rotary threaded shaft and a special bearing unit secured to the member to be moved linearly, in which the bearing unit comprises a plurality of rollers each having a plurality of radial right flanges intermediate their ends spaced apart and scheduled to complement the pitch of the shaft threading for rolling engagement herewith, which rollers at their ends are formed with thrust bearing surfaces that are angled relative to their ...

A turbine in the form of an endless "Venetian blind" set of arcuate turbine blades mounted to extend between a pair of endless chains that are entrained over sets of sprockets so that two flights of the blades travel in opposite directions in closely spaced parallel planes. Shafts connect sprockets of the sets to maintain the blades parallel and to deliver to an alternator the torque applied to the sprockets by the reaction of the blades to a fluid passing therethrough.

Disclosed is a device for accurately indexing a worktable which carries a workpiece thereon upon which work operations are to be performed. The worktable is moved intermittently to successive locations by a pneumatic cylinder under the direction of a program device movable with the worktable. A control device, in its preferred form being a pneumatic logic circuit, reads the program device to actuate the cylinder in accordance with the program, locks the worktable at the desired position, actuate...

Linear copolyesters formed from (A) isophthalic acid and, optionally, terephthalic acid and (B) bis(4-beta-hydroxyethoxyphenyl) sulfone and ethylene glycol are described. The linear polyesters contemplated have glass transition temperatures higher than that of poly(ethylene terephthalate) and oxygen and CO.sub.2 permabilities less than that of poly(ethylene terephthalate).