Abstract: A rotor for an electromagnetic indicator comprises a flat circular disk made of thin, pliable, nonmagnetic material. The disk has integral tabs extending out of diametrically opposite edges and a rib extends diametrically of the disk to outer ends of the tabs. The rib and tabs define T-shaped trunnions which engage in T-shaped slots in respective sides of a rotary magnet, and a journal block. The disk is fabricated from a single flat sheet having flat tabs extending outwardly of opposite edges. A V-shaped groove is made in the sheet extending centrally across the disk and tabs. Opposite sides of the groove are then brought together to form the rib with T-shaped trunnions at opposite edges of the disk.

Abstract: A flat armature type of torque motor includes integral transversely extending ledges formed on the pole pieces adjacent the working air gaps, and rigid non-magnetic spacer pins extending between the ledges and retained by integral portions formed on the coil bobbins for accurately maintaining the spaced-apart relationship of the pole pieces.

Abstract: A magnetically actuated indicator which includes an elongated housing and an elongated core having a first asymmetric axial extremity mounted for (a) sliding axial movement and (b) rotation about the axis thereof. At least one elongated winding is disposed for cooperation with the core. The apparatus also includes at least one rotatably mounted indicator member having at least first and second discrete magnetic poles disposed in spaced relationship.

Abstract: An electric rotary actuator for producing rotation through a limited angle comprises a rotor winding made of a plurality of thin loop coils arranged in a continuous cylindrical framework as part of a rotor shell. The rotor shell lies in an annular flux gap defined by a stator magnet assembly and a flux return means. Each pair of adjacent axially extending limbs of adjacent loop coils lies opposite to and cooperates with a respective stator pole face. This winding arrangement helps to optimize the torsional resonance characteristics of the rotating mass.

Abstract: An electromagnetic indicator has a stator carrying a stationary reversibly magnetizable core, and a rotor including a display disk and rotary cylindrical magnet. The magnet is permanently magnetized with two poles each angularly spaced apart less than 180.degree. at one side of a diameter of the magnet which also passes through the radially located core. Stop elements carried by the stator and core are engaged in each stopping position of the rotor when one of the magnet poles is attracted to, but held spaced from the magnetized core. The poles can be located to effect a turning range of the rotor from 120.degree. to 250.degree..

Abstract: A magnetic rotary activator has a permanent magnet mounted for rotation about a fixed axis and a core member having an energizing coil with a current reversing mechanism. The core member has at least three poles arranged to be reversed in polarity by reversing current flow through the coil. The poles are arranged to rotate the permanent magnet through a predetermined angle upon reversal of current flow.

Abstract: A rotary electromagnetic actuator of swing type capable of generating sufficient torque in a wide swing range. The actuator comprises a stator having plural stator poles and a rotor having rotor poles as many as the stator poles. Each of the stator poles is provided with plural concave curved surfaces which have respectively different radii from the rotary center of the rotor and are arranged in order of size of radius to form stairs ascending in the forward rotation direction of the rotor. On the contrary each of the rotor poles is in form of stairs descending in the same direction. The pitch of the stairs of the stator is longer than that of the rotor so that each couple of edges of both stairs may sequentially approach owing to the magnetism therebetween to each other for rotating the rotor step by step.

Abstract: A rotary actuator for imparting a rotational force to a rotary valve member of a multi-way valve device has a cylindrical housing and an electric motor housed therein and being operative to produce a torque corresponding to the input current supplied to the motor. The motor shaft is hollow and rotatably journalled by the end walls of the motor housing. A torsion bar is housed in the shaft and fixed at one end to one end of the shaft. The other end of the torsion bar is fixed to the housing so that, when rotational force is imparted by the motor to the shaft and thus the rotary valve member connected thereto, the torsion bar produces a return force applied to the shaft. The angular position of the other end of the torsion bar about the axis thereof is adjustable within a limited range. The actuator is suited to impart a rotational motion of less than 180.degree. and provides a reduced hysteresis in the rotation characteristics.

Abstract: A rotary electrically actuated device is provided for controlling fluid flow and includes a stator member having a base section, a post, and symmetrically arranged extensions which coact to form a cavity in which a coil is disposed. A rotor is supportingly mounted on the distal end of the post and is adapted to rotate within a predetermined sector. The rotor has a first section extending partially into the cavity and is provided with circumferentially-spaced magnetic pole elements having corresponding curved endfaces conforming substantially to curved interior surfaces of the extensions. Each endface has a surface configuration having a side portion narrower than the opposite side portion. The rotor is biased to normally assume a position within the sector wherein only the narrow side portions of the endfaces are disposed adjacent to the extension interior surfaces and the remainder of the endfaces are out of registration with said interior surfaces.

Abstract: A rotary actuator is disclosed useful in controlling throttle settings on internal combustion engines. The angular displacement of the actuator shaft is a function of the current applied to the actuator. In the disclosed embodiment the relationship between current and angular displacement has three distinct regions: increasing displacement, linear displacement and decreasing displacement with respect to applied current. These regions are matched to the engine characteristics to produce a desired response from the engine. The actuator consists of a rotor biased by a coil spring to a first position and displaceable to a plurality of intermediate positions by magnetic actuation from pole pieces associated with current carrying coils. The arrangement and configuration of the rotor and pole pieces produce the desired three region response characteristic.

Abstract: An electromagnetic driving device for driving shutter blades wherein a field coil used as stator encircles a permanent magnet rotor and extends across the rotational axis thereof. The rotor is arranged to undergo reciprocating rotation through less than one half turn in driving the shutter blades to open and close the shutter. Interference between the field coil and a coaxially arranged output shaft is avoided by the provision of a U-shaped intermediate member extending about the field coil and connecting the output shaft and the rotor.

Abstract: An electromagnetic final control element is proposed which serves to generate a repeatable rotary motion throughout a limited rotary angle. The electromagnetic final control element includes electrical current supply conductors connected between a plug on the housing and an armature which are formed as elastically deformable conductors secured at one end on an outer roller path body having an outer roller path associated with each current conductor and, on the other end, are secured on an inner roller path body with an inner roller path connected with the armature. Each outer roller path extends eccentrically with respect to the inner roller path whereby the distance between the inner roller path and the outer roller path increases in the roll-off direction of the current conductors from the outer roller path. Thus, it is possible to have an electrical current supply free of retrograde force between the plug and the armature.

Abstract: An electromagnetic rotary actuator including three laminated pole pieces equiangularly spaced about an output shaft. Each of the pole pieces has a bobbin coil wound thereabout. The output shaft rotor is magnetized with four 90.degree. poles. One of the stator coils is utilized as a reference coil and is energized with a DC current. The other two coils are each coupled to a respective drive transistor. The drive signals to the two drive transistors are complementary. The resultant magnetic field set up by the three stator coils interacts with the magnetic field from the output shaft rotor to move the output shaft to a selected angular position.

Abstract: This invention relates to a rotary solenoid or similar electromagnetic rotating apparatus that is capable of smoothly rotating through an angular range of approximately 180 degrees, in both directions, without employing a return spring or other like means.

Abstract: A printing device for chronocomparators comprising a striker, an ironless cylindrical coil mounted for rotation in an air gap of a magnetic circuit and connected to the striker, the magnetic circuit being formed by a permanent magnet placed inside the coil and an outer part of magnetically permeable material surrounding the coil. The coil is connected through spiral springs to a source of electric control pulses. The spiral springs provide a return force for bringing the coil back to a rest position in the absence of a control pulse. A cylinder with a helical rib is placed to be stricken by the striker and a recording strip is inserted between the striker and the said cylinder.

Abstract: Subject of the present invention is a compensating means for the mechanical losses and, or spring stresses in a universal impedance apparatus of electric power transmission and distribution use, the apparatus having a field and an armature coupled through a spring, with one or the other functioning as a mechanical oscillator. The means consists of a compensating winding deployed on the armature in tandem with the main winding and carrying an a.c. current in phase with the velocity of the oscillation, or a current additively proportional to both the velocity and the displacement of the oscillation.

Abstract: An electromagnetic actuator has a stator and an armature both made of magnetically permeable material and each having a plurality of projecting poles spaced apart from each other. The armature poles and stator poles cooperate with each other so that each pair of opposed pole faces of an armature pole and a stator pole form a narrow working air gap for passing magnetic flux between the opposed pole faces. An electrically energizable coil produces magnetic flux which passes through the poles of the armature and stator and across the working air gaps.

Abstract: A rotary solenoid has a substantially constant clearance air gap, adapted to proportional operation, includes a generally cup-shaped case of ferromagnetic material, an energizing coil is received in the case adjacent, an annular stator member is received in the open end of said case adjacent said coil and has at least one arcuately formed pole member, an armature has sector-shaped poles corresponding in arcuate spacing and in number to the stator poles, a plate is carried on one end of said armature and defines with the case at least one pair of cooperating non-inclined, arcuately-extending ball bearing recesses, and can conveniently define the extent of rotation of said armature.

Abstract: A rotary solenoid having an output shaft that is indirectly coupled to the rotor or armature of the solenoid, for rotation independently of or coupled to the solenoid. In one application of the solenoid the shaft is rotated through a limited range by a bimetallic torsional element, which is overridden by operation of the solenoid to increase the range of rotation. The range of travel can be limited by a disc having a slotted peripheral flange between the solenoid rotor and the output shaft. The armature has an integral hub and spaced poles with the pole pieces being rotatably positionable within the space between the hub and poles. Structure of the unit is very simple and all parts are readily accessible for adjustment and servicing.

Abstract: A rotary solenoid comprises a housing, a rotor rotatably mounted in the housing, the rotor and the housing being comprised of a magnetically permeable material, and a solenoid coil mounted in the housing about the longitudinal axis thereof. The housing has at least a first pole piece portion therein with the rotor further comprising at least a first permanent magnet means mounted therein for simultaneous rotation therewith. The first permanent magnet means has first and second null positions with respect to the first pole piece and is mounted in the plane of the first pole piece for rotation about the longitudinal axis and provides a reverse magnetic flux in the housing and rotor magnetically permeable material. The solenoid coil has an energized state and a deenergized state with the rotor rotating a predetermined angular amount about the longitudinal axis from an initial position in response to a predetermined potential applied to the coil in the energized state.

Abstract: A magnetically actuated indicator includes a housing carrying an elongated permanent magnet for pivotal motion about a geometric axis which extends transversely to the geometric axis of the magnet. First and second poles are carried by the housing and are disposed in spaced relationship to each other and each is proximate to one end of the elongated permanent magnet in one angular position thereof. A coil is magnetically linked to the poles to change the polarity thereof and a stop prevents positioning of either end of the permanent magnet intermediate the two poles to insure consistant indications.

Abstract: A high torque rotary electromagnetic actuator is described which includes a U-shaped stator formed from a substantially planar sheet of magnetic iron to have two parallel leg portions joined by a transverse connecting portion. The single piece stator which is so formed is joined to an axial core which is staked or riveted to the stator connecting portion by an intimate or press-fit to minimize reluctance to the magnetic flux flowing through the stator and core. The rotor is mounted on the free end of the core and is provided with cam surfaces for providing variable gaps with relative rotation between the rotor and the stator. The rotor is provided with an enlarged axial hub portion which is configured to compensate for the reduced axial thickness thereof produced by the provision of a counterbore which receives a portion of the core therein.

Abstract: A magnetic armature piece particularly adapted for use with a rotary solenoid includes a pair of high permeability ferro-magnetic rotary poles which are fixed in relationship to each other by relatively thin bridges which connect magnetically neutral regions on the poles so that the required magnetic flux properties of the poles are not lost. Rotary solenoids in which the described magnetic armature piece is employed are more reliable than conventional solenoids because the poles cannot become misaligned during assembly or use.

Abstract: An electric actuating device for producing limited angular displacements comprising an ironless cylindrical coil mounted for rotation in an air gap of a magnetic circuit, the magnetic circuit being formed by a permanent magnet placed inside the coil and an outer part of magnetically permeable material surrounding the coil. The coil is connected through spiral springs to a source of electric control pulses. The spiral springs provide a return force for bringing the coil back to a rest position in the absence of a control pulse. Means are provided for limiting the angle of rotation of the coil.

Abstract: A bistable position indicating device comprising a fixed and a movable part, the latter being provided with two portions having different colors and arranged to be switched to one or the other color portion position by means of coaction between a permanent magnet and an electromagnet having mutually setable positions. The movable part comprises an elongate body such as a cylinder, which has its envelope surface axially divided into said two portions of different colors, and is turnably arranged about its central axis. The electromagnet is provided with pole shoes arranged to meet the poles of the permanent magnet, both the magnets being, on the application of a current pulse to the electromagnet coil, through coaction between the fields of the magnet and the coil, turned in relation to each other so that the movable part is turned through an angle less than 180.degree., particularly mainly 180.degree., and is reset from one color position to the other and vice versa.

Abstract: The invention relates to a device for checking the angular position and the starting position of a roller supporting a plurality of indicating pallets, which roller is driven in stepwise rotation. The device comprises magnetic members adapted to sense the position of magnetic poles provided on the roller or on a member mechanically linked to the roller, whereby the number of steps taken by the roller, starting from a predetermined position, can be counted taking advantage of a circumferentially arranged Hall effect and without contact between the sensing members and the roller or the member mechanically linked thereto.

Abstract: A rotary solenoid, particularly for use in electronic teleprinters and the like, especially for attachment perforators, etc., in which most of the metal components may be fabricated in the form of stamped sheet metal structures rather than turned or machined components and which is relatively readily adaptable to automatic fabrication, the stator poles being in the form of stamped sheet metal laminations disposed in respective aligned stacks at opposite ends of an actuating coil and provided with respective bearing members, for the armature, disposed at the outer faces of the respective pole stacks, with each bearing member having an inwardly directed bearing boss extending into the adjacent stack and in engagement with the respective pole faces thereof to axially align the armature in operative position.

Abstract: A rotary actuator provides rotation of its rotor over predetermined angles. The rotor is a cylindrical housing in which are cylindrically curved permanently magnetized poles spaced apart at their ends and surrounding a fixed armature. The armature has magnetic arms angularly disposed with respect to each other which define fixed poles. Coils wound on the fixed poles generate magnetic fields when energized to drive the rotor. A holding coil may be provided to hold the rotor stationary when the holding coil is energized. The armature may have two, three or more fixed poles. The actuator can be operated in rotor latching or fail-safe return modes. Fixed stop members may be used to limit angular rotation of the rotor.

Abstract: A magnetic mechanism for resetting a magnetic target device by reversing the direction of flux in the device yoke without requiring the energization of an electrical reset circuit. A pivotable member is provided to hold the target reset mechanism captive in a position spaced from the target mechanism when the reset mechanism is not in use.

Abstract: A variable reluctance electric motor comprises a stator including at least three pairs of pole pieces with windings surrounding at least one of the pole pieces of each pair, and a rotor structure. The rotor structure defines a pair of opposed pole pieces each having circumferentially extending extensions on the opposite sides thereof. The extensions extend at least to the adjacent pair of stator pole pieces when the rotor pole pieces are aligned with stator pole pieces, and be selective energisation of the pairs of stator pole pieces, the rotor can be made to move angularly in either direction.

Abstract: A rotary actuator comprises a stator structure defining a magnetisable pole piece and an angularly movable rotor structure which defines a pole element. The pole piece and pole element form part of a magnetic circuit and a winding is provided about a portion of the magnetic circuit defined by the rotor and stator structures. The faces of the pole piece or pole element which are presented to each other are provided with a slot or a cutaway portion which extends along at least part of the circumferential length of the face whereby a desired torque/angle characteristic is obtained.

Abstract: A multi-position detent device in which a plurality of detent positions are available with each position determined by discrete magnetic fields established between stator and rotor pole pieces and in which both stator and rotor have a magnet sandwiched between pole members in which the pole pieces radially project with respect to the stator and rotor pole pieces of opposite polarity projecting toward each other.