Abstract: A method for electromagnetic acceleration of an object involving interaction of magnetic forces between magnetic rings on the object to be accelerated and alternating magnetic fields in a ringing circuit formed in each of a series of linearly arranged doughnut shaped accelerator coils with the frequency of the ringing circuit generated in each coil being adjusted according to velocity of the body being accelerated by adjusting the capacitance in each ringing coil circuit; computation being necessary for each particular application to properly match components to achieve desired velocity.

Abstract: A linear motor provides stepwise, incremental advance of a moveable output member. First and second, spaced latches are movably coupled to the output member. A selectively energizible driver engages and moves the first latch into fixed engagement with the output member and continues to move the engaged first latch and output member a predetermined incremental advance distance. The second latch is biased to retain the output member in each successive incremental advance position while the first latch is being reset. In one embodiment, the driver is a solenoid having a movable plunger operably coupled to the first latch. In another embodiment, the drive is a motor having a rotatable output shaft with an eccentric cam mounted thereon. The eccentric cam engages the first latch to move the first latch into fixed engagement with the output member and to advance the fixedly engaged first latch and output member an incremental advance distance.

Abstract: A voice coil type actuator wherein the length in an axial direction and the number of parts is reduced without deteriorating a required function and the magnetic flux density in a space in which a movable coil is located is substantially uniform over the entire length in an axial direction. The voice coil type actuator comprises a fixed guide shaft having a radial portion made of a permeable material and a movable body supported for axial sliding movement on the guide shaft. The movable coil is supported coaxially with the guide shaft on the movable body. A yoke having a substantially cylindrical profile is disposed in such a manner as to surround a range of movement of the movable coil, and a pair of fixed magnets are disposed in contact with the guide shaft and the yoke and magnetized with the opposite polarities in a radial direction.

Abstract: A linear motor comprising first and second magnetic members with first and second magnets secured to and cooperating respectively with the first and second magnetic members to form first and second magnetic circuits each having a magnetic gap formed therein, first and second driving coils mounted for integral movement with each other along the magnetic gaps and each including a driving coil winding wound in such a manner as to partially extend perpendicularly across a magnetic field produced in the magnetic gap by the first or second magnet and a velocity detecting coil winding wound in an overlapping relationship with the driving coil winding, the velocity detecting coil windings of the first and second driving coils being wound and connected to each other such that voltages induced in the velocity detecting coil windings of the first and second driving coils by external magnetic fields from a common magnetic field other than the magnetic fields produced by the first and second magnets are cancelled by each

Abstract: An improved electromagnetic actuator of the type comprising (a) a first assembly; (b) a second assembly movable relative to the first assembly along an axis of relative movement in response to a command signal, the second assembly comprising magnetic flux source means for defining radially directed flux both in an inward and outward direction relative to the axis of relative movement; (c) coil assembly means for defining at least two coil segments respectively disposed in the paths of the flux in the inward and outward directions; and (d) means for applying the command signal to the coil segments so that a current flows in one direction around the axis through the inward directed flux, and flows in the opposite direction around the axis through the outward directed flux so that the flux/current force applied between the first and second assemblies is additive. In accordance with one aspect of the invention flat magnets and flux focussing elements are used to provide the radially directed flux.

Abstract: An electromagnetic solenoid comprises a coil wound around a coil case and a plunger inserted into the coil so as to be slidable in the axial direction, wherein a tape impregnated with a thermosettable resin is wound on the trunk portion of the coil case and the coil is wound on the wound tape.

Abstract: An electromagnetic actuator includes a cylindrical rod made of a magnetic substance and having a large number of annular teeth formed on an outer surface thereof at a fixed pitch, and a plurality of annular electromagnets fitted on the cylinder rod. The intervals of the annular electromagnets are set such that the offsets between the annular teeth of the annular electromagnets and the annular teeth of the corresponding cylindrical rod gradually increase. This ensures highly accurate axisymmetric configuration which in turn ensures a completely axisymmetric distribution of the magnetic flux. In consequence, the radial force which acts between the electromagnet and the rod can be reduced, and control over the movement of the rod in the axial direction is thus facilitated.

Abstract: A solenoid valve which includes a valve body having a central bore from which fluid passages radially extend. A valve spool is axially slidably captured within the valve body bore to control passage of fluid among the valve body passages. An electromagnetic variable force motor is mounted on the valve body and includes a housing of ferromagnetic construction with a pole piece of ferromagnetic construction coaxial with the valve spool and surrounded by an electrical coil. An armature comprising a ball of ferromagnetic construction is positioned coaxially with the pole piece in abutting engagement with the valve spool. A coil spring is positioned to engage the ball-armature and to urge the same axially away from the pole piece. The characteristic of magnetic attraction between the ball-armature and the opposing face of the pole piece as a function of separation therebetween is substantially identical with spring rate, both preferably being a linear function of ball-armature displacement.

Abstract: A linear motor provides stepwise, incremental advance of a movable member. A linear motor includes an electric coil surrounded by a magnetic core. A co-axially aligned magnetic movable pole member and a magnetic plunger extend through the core and coil. Opposed faces of the movable pole member and the plunger are separated by an air gap. A biasing spring is connected between the plunger and the pole member to bias the pole member away from the plunger when electric current has been removed from the coil to re-establish the air gap between the pole member and the plunger. Latches act on the pole member and the plunger to provide unidirectional movement of the pole member and plunger when a magnetic field induced in the core when current is applied to the coil causes advance of the plunger into contact with the pole member.

Abstract: An electromagnetic variable force motor circuit comprising a solenoid including a coil, a pole piece associated with the coil and a ball armature. A spring urges the ball armature toward a first seat and away from the pole piece. A first chamber is provided adjacent the first seat, the ball armature and the first seat define a first orifice extending between the ball armature and the first chamber. A first passage provides supply pressure to the first chamber. A second orifice is provided in the first passage. A valve including a movable member responsive to fluid pressure is provided in the first chamber. A second passage provides supply pressure to the valve. A third passage provides control flow from the valve device. A fourth passage provides exhaust flow from the first chamber when the ball armature is moved away from the first seat such that the ball armature controls flow through the first orifice to the fourth passage upon excitation of the coil.

Abstract: A moving-magnet type linear d.c.

Abstract: The device has a box-like supporting structure which slidably accommodates at least one slider arranged laterally facing the needle cylinder of the machine and is movable, by virtue of the action of a linear motor, along a direction which is radial to the needle cylinder. The slider is rigidly associated, with its end which protrudes out of the box-like structure, with a knitting cam which is selectively engageable with needle actuation elements by moving the slider. The slider is constituted by a shaft which is slidably supported, along its axis, by the box-like structure by means of a first bearing which is arranged inside the box-like structure and has balls partially accommodated in longitudinal seats defined on the outer surface of the shaft and in seats correspondingly defined on the inner surface of a bush which extends around the shaft and is prevented from rotating about its axis.

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 solenoid valve which includes a valve body having a central bore from which fluid passages radially extend. A valve spool is axially slidably captured within the valve body bore to control passage of fluid among the valve body passages. An electromagnetic variable force motor is mounted on the valve body and includes a housing of ferromagnetic construction with a pole piece of ferromagnetic construction coaxial with the valve spool and surrounded by an electrical coil. An armature comprising a ball of ferromagnetic construction is positioned coaxially with the pole piece in abutting engagement with the valve spool. A coil spring is positioned to engage the ball-armature and to urge the same axially away from the pole piece. The characteristic of magnetic attraction between the ball-armature and the opposing face of the pole piece as a function of separation therebetween is substantially identical with spring rate, both preferably being a linear function of ball-armature displacement.

Abstract: A rail gun utilizing a combination of chemical energy for propelling a piston and a projectile. The piston movement creates electromagnetic energy in rails which further increases the velocity of the projectile as it leaves the gun barrel. In operation, propellants are introduced into the gun and ignited. High pressure gas produced from the combustion accelerates the piston and the projectile along the rails. An external field normal to the piston is applied from a dipole magnet wound around the gun bore. The piston movement induces emf thus charging the rails which act as an inductor. The current flowing in the rails further increases the velocity of the projectile along the barrel to its final exit velocity.

Abstract: A linear reciprocating electromagnetic machine has an outer stator member having axially spaced apart pole pieces, an open-slot coil cavity housing a coil, and an inner stator member spaced from the outer stator member and providing means for completing a path for magnetic flux. The machine also includes a permanent magnet plunger arranged for reciprocation with respect to the stator members and within the space between such stator members. The plunger is provided with three permanent magnet segments arranged axially along the plunger such that the interface zones between the magnet segments are substantially within the region defined by the stator pole pieces for all operating axial positions of the plunger. The two outer magnet segments are of equal axial length while the center magnet segment is axially longer than an outer magnet segment by an amount equal to the axial length of the open slot of the coil cavity.

Abstract: A projectile accelerator using reversed magnetic fields to accelerate a cylindrical projectile. The magnetic slingshot (MSA) includes an outer coil which produces a magnetic field within itself and a coaxial inner cylinder with breakable contacts, called a flux reverser. The magnetic field produced by the outer coil is suddenly reversed, trapping the original magnetic field within the flux reverser and storing magnetic energy in the form of magnetic flux lines that curve around the aft end of the projectile, which fits just inside the flux reverser. The stored magnetic field interacts with azimuthal currents, causing an accelerating force along the axis of the coil. A contact in the flux reverser opens aas the projectile passes, allowing the flux lines to closely trail the accelerating projectile and maintaining an imbalance in the accelerating force.

Abstract: An improved electromagnetic actuator assembly is described. The assembly comprises a magnetic circuit for defining radially directed flux both in an inward and outward direction, and a coil disposed in the flux paths and connect to receive a control signal so that a current can be applied in one direction through those portions of the coil disposed in the inward radially directed flux, and applied in the opposite direction through those portions of the coil disposed in the outwardly directed flux so that the flux/current products of the coil portions and associated flux are additive.

Abstract: An electromechanical abutment stop intended particularly for folding machines comprises of a coil (4) and a magnet (2) which are resiliently movable relative to each other. Disposed between coil (4) and magnet (2) is a damper plate (9) of softly resilient material as defined. The abutment sensor is characterized by low overall height. In a preferred embodiment, at least one surface of the damper plate (9) is occupied by projections (10), the shape of which can be used to determine the signal:mechanical pulse characteristic within wide limits, particularly so that the rise in the magnitude of signal will become ever smaller as the mechanical pulse becomes greater. By limiting the free length of travel .DELTA.x coil 4 or magnet 2), it is possible to confine the signal within an upper limit or threshold.

Abstract: Electromagnetic actuators are disclosed for precisely and directly incrementing an output member along a given generally linear path. Included in one actuator is a pair of assemblies, one of which is movable with respect to the other along the given path. A first of the assemblies includes means for producing a first magnetic field extending to the second actuator assembly in a manner generally transverse to the given path. The second actuator includes energizable means alongside the path and for producing a pair of opposed, approximately equal magnetic fields, spaced along the given path. Each of these opposed fields being aligned to cooperate with the transverse field to produce a force between the assemblies tending to centrally locate the assemblies with the transverse field between the pair of opposing fields.

Abstract: A linear actuator for reciprocating a read/write head mechanism relative to a magnetic disk storage system, including a second, supplemental solenoid coil and associated magnet pole in addition to the usual arrangement, by way of improving linearity and efficiency. A low reluctance end cap connects the magnet poles to a central coke.

Abstract: A permanent magnet made of a pulverizable magnetic material is positioned immediately adjacent to a quantity of an explosive. An electrically conductive coil surrounds the permanent magnet and the explosive. A detonator is provided for detonating the explosive. The explosive is capable, upon detonation, of rapidly removing the magnet from inside the coil by disintegration, by collapsing the magnet or by causing high velocity omni-directional dispersal of a plurality of minute fractional parts of the permanent magnet. A single-pulse high voltage electrical signal is thereby induced in the coil.

Abstract: A non-commutated linear motor particularly suitable for use as an electric door lock actuator for an automobile is disclosed. The linear motor may include a series of cup-shaped portions each having a winding appropriately connected to provide the desired travel stroke, in a direction determined by polarity of D.C. power applied to the winding, and power for the linear motor or a segmented armature designed to achieve the same flexibility in motor design and assembly.

Abstract: An electromagnetic actuator includes a moving element comprising a plurality of permanent magnets oriented in alternating magnetic pole position so as to present a sequence of alternating north-south magnetic poles. The magnets can be angularly oriented within a magnetic structure serving to concentrate magnetic flux and focus such flux at the surface of the structure. Alternatively, the magnets are surface mounted within a structure of non-magnetic material. The actuator includes opposed electro-magnetic stators between which the moving element is positioned.

Abstract: A linear actuator is a hybrid in that movement of the armature is influenced by the field of permanent magnets and the field of a coil when it is energized by direct current. The coil is fixed in a ferromagnetic shell and a pair of permanent magnets are fixed in the shell axially of the coil. The armature has a reduced diameter tip or end which is influenced by the magnets when the coil is deenergized and which enables the force on the armature to remain generally uniform over the working stroke of the armature. The linear actuator is shown operating a sleeve valve spring biased to closed position and opened relative to the metering cone by application of direct current to the coil. The effective magnitude of the current determines how much the valve opens.

Abstract: A linear motor provides stepwise, incremental advance of a movable member. The linear motor includes an electric coil surrounded by a magnetic core. A magnetic movable pole member is coaxially aligned with a magnetic plunger member and extends through the core and coil. Opposed faces of the movable pole member and the plunger are separated by an air gap. An incremental advance member is fixedly attached to the plunger and extends outward from the movable pole member. A biasing spring is connected between the incremental advance member and the pole member to bias the pole member away from the plunger when electric current has been removed from the coil to re-establish the air gap between the pole member and the plunger.

Abstract: A linear unit for handling equipment of industrial production is proposed, the longitudinally displaceably borne tool support (2 and 19) of which is designed as a gear rack of a linear motor (11 to 18 and 22 to 24) serving for driving the support.

Abstract: A linear reciprocating machine has a tubular outer stator housing a coil, a plunger and an inner stator. The plunger has four axially spaced rings of radially magnetized permanent magnets which cooperate two at a time with the stator to complete first or second opposite magnetic paths. The four rings of magnets and the stators are arranged so that the stroke of the plunger is independent of the axial length of the coil.

Abstract: A reciprocating electric motor for wells includes a stator comprising a stack of coil groups surmounted by an annular power pack, the whole being mounted on a non-ferromagnetic tube and potted and slipped into a tubular ferromagnetic housing, the coils being helically wound strips of conductive material with their outer ends folded down to extend paraxially and their inner ends folded radially thereacross and then down paraxially to provide connections between like coils in each group forming a plurality of sets for simultaneous energization, and an armature extending through the stator coils and annular power pack for reciprocation therewithin, the armature including alternating ferromagnetic and non-ferromagnetic sections.

Abstract: Alternately stacked radial-pole stator and spacer laminations provide a simple linear actuator, in which alternating layers form magnetic teeth in the axial direction. The spacer laminations are non-ferromagnetic or dimensionally spaced from the flux path. The stator laminations have radially extending pairs of poles, forming a central hole which may be filled and ground smooth along with the spacers, forming smooth pole faces upon which the armature may slide.Flux paths are coplanar with stator laminations, thus making each lamination completely independent. Electromagnetic force increases linearly as stator laminations are added. The stacked stator laminations have pole faces each having a finite pole face flux capacity; related armature rings can be mounted on a nonmagnetic support tube and made as light as possible so long as each ring is of sufficient cross-sectional area to carry half the pole face flux capacity.

Abstract: A rodless linear drive cylinder includes a cylindrical hollow tube, sealed at the ends and containing a pneumatically driven piston. The drive cylinder is so mounted to extend across the ink fountain of a printing machine and includes an ink agitator suspended therefrom into the ink fountain. The agitator is magnetically coupled to the drive piston of the linear drive cylinder.

Abstract: A linear air compressor having a linear electrodynamic motor which is air cooled and has an increased stroke and accordingly increased output. The working piston is provided with and stroke parting on a push-pull spring provides for centering of the plunger of the motor.

Abstract: Using a smooth laminated armature assembly, with a ferromagnetic double-helix stator shaft, provides an economical radial pole linear reluctance motor requiring no external armature bearings. The stator shaft has a double-helical screw tooth pattern cut into its surface. Spaces between screw threads are preferably filled with low permeability material. The armature assembly has radial pole laminar plates, separated by identically configured laminar spacers, separated by an insulating layer, which provides eddy current isolation, physical stability and original adjustment of laminations for overall accuracy to linear positioning, despite tolerances in the individual laminar plates. Each laminar plate has a number of inwardly projecting teeth centered about the internal channel. These internal teeth and the double helix screw teeth on the stator shaft provide flux paths through the stator.

Abstract: A winding method for winding the parallel connected coils of the stator structure of an electromagnetic device, the individual coils being connected in parallel to a pair of supply terminals. On completion of one coil the wire is led into the adjacent groove to be occupied by the next coil to be wound and one turn is wound in the groove before the wire is led to a supply terminal.

Abstract: An electromagnetic actuator including a stator and an armature having opposed flat faces which are movable relative to each other, grooves formed in the flat face of the stator facing the flat face of the armature, with endless coils received in the grooves, and bore hole formed in the stator for fluid communication between the grooves, for allowing resin to be poured in the bore hole and thus fill the grooves with the endless coils therein.

Abstract: A controlled force variable reluctance actuator. A variable reluctance actuator having a moving element operated by a solenoid is provided in which the current in the solenoid is controlled by a signal representative of the flux density in the magnetic circuit of the actuator. The signal is produced by a Hall effect device placed in the magnetic circuit. Preferably, the Hall effect device controls the current in the solenoid by controlling its duty cycle; however, continuous control of the current may also be employed. Alternative embodiments are provided for a constant force actuator, an actuator whose force-displacement characteristic is altered, and an actuator in which the force may be selectively controlled. An embodiment is also provided for selectively controlling the position of the moving element based upon measured electric and magnetic parameters of the actuator.

Abstract: An electrical machine, which may be designed as a rotating machine or as a linear drive, includes a stationary part having an odd number multiphase winding (preferably five or seven phases), and a movable part separated from the stationary part by an effective gap. Each pole of the movable part includes two pole portions which diverge from each other in the direction away from the effective gap and between the end regions of which at the effective gap a magnetically non-conductive separating gap is provided which is greater than the effective gap. In such a machine, which is characterized by a permanent excitation in the movable part, there is provided between the proximate pole portions of each of adjacent poles a respective permanent magnet, the direction of flux of each permanent magnet being directed oppositely to the direction of flux of each adjacent permanent magnet.

Abstract: An improved electromagnetic induction method and apparatus therefor for simultaneously collapsing and propelling a deformable annular-shaped workpiece of relatively lightweight construction in a direction outwardly of the apparatus and along its axis wherein the apparatus is made up of seven different embodiments for carrying out the method. Each apparatus is generally comprised of a framework. The framework includes at least one pulse coil means; and a power supply circuit is connected to the pulse coil means. Annular-shaped surface portions of various embodiments of the apparatus define part of an aperture or passageway for receiving a workpiece and function to position the workpiece in mutual inductance relation to the coil means.

Abstract: A variable reluctance actuator, of either the linear or rotary type, having a moving element operated by a solenoid, is controlled by a Hall effect sensor signal representative of flux density in the magnetic circuit of the actuator. The actuator may be operated in either a constant-force control mode, or a position-sensing or control mode. Substantially constant force, independent of position of the actuator's movable element, is obtained by varying, rather than stabilizing, the sensed magnetic field during movement. Position sensing, independent of actuator force, is obtained by variably controlling the magnitude of the excitation current of the Hall effect sensor in response to the magnitude of the coil current and Hall sensor output.

Abstract: Magnetic actuators with dogs for positioning regulating rods in a nuclear reactor. The dogs (2) for lifting and/or holding the control shaft (1) are provided with at least two teeth (4) separated by a distance equalling that separating two successive grooves (3) of the shaft (1).

Abstract: The present invention provides a multi-purpose facsimile machine which functions as either a telecopier or a photocopier, at the selection of the user. The machine, when used as a telecopier, eliminates synchronization of transmitting and receiving units by storing transmitted data in a memory prior to printing. The facsimile machine includes a linear motor for driving both a print head and scan head on a single block. The linear motor includes at least one electrical coil driven along at least one lateral guide member formed from interspersed magnetic and non-magnetic materials. By selectively energizing the coil, the motor is advanced along its guide member by magnetic interactions. The electrostatic print head of the facsimile machine includes at least one thin conductive wire fused into at least one glass casing for providing a solid block structure for protecting and supporting the wire.

Abstract: A linear force motor has an elongated body provided with an annular chamber therewithin. An armature is arranged within the chamber for axial movement relative thereto. Two axially-spaced permanent magnets, with their like poles arranged to face one another, are arranged within the body radially inwardly of the chamber, and are separated by a common polepiece. The force motor has four axially-spaced active air gaps, arranged in various reciprocal pairs and various parallel pairs. When the armature is shifted one direction relative to the body, the majority of each magnet's static flux passes through one parallel pair of air gaps. When the armature is shifted in the other direction relative to the body, the majority of each magnet static flux passes through the other parallel pair of air gaps. The motor has one or more coils operatively arranged to generate control flux in a path which passes through at least one reciprocal pair of air gaps.

Abstract: The disclosure depicts a main field coil for use in a dynamoelectric machine. The main field coil has a support having a predetermined geometry and a solid strand electrical wire wound about the support. Coil head air vents of predetermined width are inner spaced in the wound electrical wire. A structurally rigid removable means for forming the air vents is located at least partially in the air vents. The removable means is removed from the air vents after the electrical wire is wound about the support. The present disclosure describes the apparatus and a method for forming the air vents in the main field coil.

Abstract: A proportional pressure control device having a motor with a housing and a reciprocably movable armature oriented in the housing for movement between first and second limit positions. A valve body is secured to the motor housing. A platelike poppet valve member is secured to the armature on at least one end thereof. The valve body has a fluid pressure port thereon and it extends into the interior of the valve body to a chamber. A flow restrictor device is provided in the pressure port to restrict fluid flow from an external pressure source into the pressure port and the chamber. A nozzle outlet structure is provided in the chamber and has an annular flat valve seat thereon directly opposing the poppet valve member. The spacing between the valve seat and the poppet valve member effects a controlling of the magnitude of the fluid pressure developed in the chamber.

Abstract: A carriage device used for moving and positioning a magnetic head opposite prescribed tracks of a magnetic disk has the magnetic head mounted on a carriage which has linear motor mechanisms built integrally therein. The linear motor mechanisms incorporate coils secured to part of the carriage and permanent magnets secured aorund the coils. Guide rails serving to support the carriage within the range of the sliding motion of the coils are made of a magnetic substance.

Abstract: A reciprocating electric motor employs plural motor stator modules each including a group of coils selectively energized in subgroups to produce a magnetic field sweeping from one end of the group to the other and then repetitively from the same one end to the other always in the same direction until a number of ferromagnetic non-ferromagnetic armature sections each equal in length to the length of the stator modules and equal in number to the stroke of the motor divided by the length of each section has passed the stator module and thereafter the sequence of energization is reversed to move the armature a like distance in the opposite direction, the several coils of each group being electrically connected in a set each of which has its own power supply, the power supplies being collectively controlled by a microprocessor.

Abstract: A linear stepper motor comprising a stator bar having stator teeth and a slider having slider teeth. The slider is positioned under the stator bar. The surface of the stator bar opposed to the slider has a pair of flat portions with a predetermined width between the edges and the teeth. The flat portions serve as rail portions for the rollers mounted on the slider. On the surface of the stator bar extending between the pair of flat portions are formed a plurality of parallel grooves to provide a plurality of stator teeth. The surface of thes stator bar is hardened by plating with a metallic material.

Abstract: A bistable actuator comprising a permanent magnet assembly secured to an armature shaft and a pair of core elements axially disposed on either side of the permanent magnet assembly. The cores have axially opposed inner and outer annular extensions defined in each core by a central axial opening which supports the armature shaft and an annular recess in which is received an electrical coil. The permanent magnet assembly comprises inner and outer annular axially magnetized permanent magnets radially spaced by a ferromagnetic ring so as to be aligned with the inner and outer core extensions.

Abstract: In a centrifugal pump, a pumping section comprising a circular conduit has an input section subtending an arc on the circle. A plurality of channels connect the input section to an input conduit subtending an arc of a circle smaller than and concentric with or parallel to and vertically displaced from the circle defined by the pumping section. An output section subtends an arc defined by a circle concentric with and larger than the pumping section or vertically displaced therefrom. An impeller comprising vanes mounted on an annular disk is mounted in the pumping section and has magnetically saturable sections angularly spaced thereon driven by coils surrounding the pumping section and angularly spaced therealong.

Abstract: A fluid pumping system including a variable-volume, fluid-reception chamber having an inlet conduit leading from a fluid supply site and an outlet conduit leading to a fluid delivery site. An elongated plunger body is drivingly coupled with the chamber and linearly reciprocable along its longitudinal axis so as to alternately expand and contract the volume of the chamber, thereby alternately drawing a fluid into the chamber through the inlet conduit from the fluid supply site and pumping the fluid through the outlet conduit towards the delivery site. The linear reciprocation of the plunger body is effected by an electromagnetically operated drive, preferably a linear motor drive, at a rate of reciprocation in the range of 0.01 to 10 Hz.