Abstract: The invention relates to an inductive transmitter for transmitting measurement data and electrical energy between two components (1, 2) that move in relation to each other, having at least one primary (3, 5) and at least one secondary transmitter component (4, 6). There is one transmitter (3, 4) for transmitting measurement data and one transmitter (5, 6) for transmitting electrical energy, with the primary (3, 5) and secondary (4, 6) transmitter components being disposed in separate chambers (7, 8) that are magnetically shielded from each other to a large extent. The chambers (7, 8) are formed on the components by concentric, radial metal walls of the chamber elements (1, 2), with the concentric walls extending into each other in such a way that they form chambers (7, 8) situated radially one behind the other.

Abstract: A spacer 2 is provided between an inner core 62 and a resolver rotor 63, which are respectively attached to a rotary shaft 68. A cutout groove 42 is formed at a flange 41 of the inner core 62. A fixing groove 3 and the cutout groove 42 are aligned in the rotary shaft 68 direction. The rotary transformer output winding 65 and resolver excitation windings 64 are soldered and electrically connected by a crossover 60. The crossover 60 is covered with an insulating tube 6. The crossover 60 is fitted into the fixing groove 3. The fixing groove 3 and an inter-magnet space 631 are misaligned in the circumferential direction of the rotor 63. Thus, a frictional force is applied between the insulating tube 6 and the fixing groove 3, which secures the crossover 60 and prevents the crossover 60 from escaping from the fixing groove 3.

Abstract: A device useful for transferring signals from static surface to a rotating surface, said device comprising a pair of pot cores acting as a primary and secondary core and said primary pot core being wound with ‘N1’ number of turns and said secondary pot core being wound with ‘N2’ number of turns of a conducting wire respectively, such that each turn of the wire rests on top of the previous turns thereby increasing inner diameter of the pot core by a wire thickness each time, one of the said pot core is mounted on a rotating surface and the other pot core being fixed to a static surface with minimum air gap between each other such that the coils are always facing each other even if the primary and the secondary cores are rotated through 0 to 360° with respect to each other.

Abstract: An angle-torque sensor has: a torque detection coil that detects a change in state quantity in a mechanism to detect a relative angle made between input axis and output axis of a torsion bar to be twisted by a torque; an angle detection coil that detects a change in state quantity in a mechanism to detect a rotation angle of a reduction axis which rotates with a rotation being transmitted from the input axis or output axis and being reduced by a reduction mechanism; a torque detection circuit that detects the relative angle from the output of the torque detection coil; and an angle detection circuit that detects the rotation angle from the output of the angle detection coil.

Abstract: A rotor transformer positioning mechanism permitting automatic positioning of a rotor transformer, having a first winding, relative to a rotor stack, having a second winding, mounted on a common rotary shaft to thereby permit a crossover having a predetermined length to be installed between the first and second windings includes a crossover positioning cutout disposed in a first flange of the rotor transformer. In an exemplary case, the rotor transformer includes the first flange and a second flange disposed on opposite ends of the first coil, and the second flange is proximate to the crossover. A method of assembling a rotating machine using the rotor transformer positioning mechanism is also described.

Abstract: A micro-electro mechanical (MEM) switch capable of inductively coupling and decoupling electrical signals is described. The inductive MEM switch consists of a first plurality of coils on a movable platform and a second plurality of coils on a stationary platform or substrate, the coils on the movable platform being above or below those in the stationary substrate. Coupling and decoupling occurs by rotating or by laterally displacing the coils of the movable platform with respect to the coils on the stationary substrate. Diverse arrangements of coils respectively on the movable and stationary substrates allow for a multi-pole and multi-position switching configurations. The MEM switches described eliminate problems of stiction, arcing and welding of the switch contacts. The MEMS switches of the invention can be fabricated using standard CMOS techniques.

Abstract: A magnetically variable differential transformer, comprising: a primary winding; a first secondary winding; a second secondary winding; a non-movable permeable core disposed within the primary winding, the first secondary winding and the second secondary winding; and a movable magnet configured for movement about the primary winding, the first secondary winding and the second secondary winding, wherein movement of the movable magnet causes magnetic saturation of portions of the non-movable permeable core.

Abstract: A primary winding 12 connected to a high-voltage, a large-current power supply 1, a secondary winding 14 connected to an electromagnetic forming coil 2, and a magnetic core 16 for guiding the magnetic flux produced by the primary winding. The magnetic core 16 is composed of a primary core 16a on which the primary winding is wound and a secondary core 16b on which the secondary winding is wound. The primary core and the secondary core are magnetically connected in contact or in close proximity. The primary core and the secondary core are separated each other when the connector is disconnected. Thus, current pulses at a high voltage (for instance, 10 kV) with a large current (for example, 100 kA or more) and a narrow pulse width (e.g., 30 &mgr;sec or less) can be efficiently transmitted, and the connector easily attached and removed.

Abstract: A target plate 3 is provided onto a shaft 1 and is has targets 3a arranged on an outer circumference. Facing the outer circumference of this target plate 3 is a sensor 5 that is provided with MR elements, which are arranged in a circumferential direction in accordance with an arrangement interval of the targets 3a. A rotational angle of the target plate 3 is calculated based on an output obtained between the MR elements in accordance with the displacement in the circumferential direction of the targets 3a, 3a with the rotation of the target plate 3.

Abstract: A rotor transformer positioning mechanism permitting automatic positioning of a rotor transformer, having a first winding, relative to a rotor stack, having a second winding, mounted on a common rotary shaft to thereby permit a crossover having a predetermined length to be installed between the first and second windings includes a crossover positioning cutout disposed in a first flange of the rotor transformer. In an exemplary case, the rotor transformer includes the first flange and a second flange disposed on opposite ends of the first coil, and the second flange is proximate to the crossover. A method of assembling a rotating machine using the rotor transformer positioning mechanism is also described.

Abstract: The present invention provides an actuating device suitable for remotely actuating a tool which can be the fluid delivery mechanism of a cleaning implement. The actuating device has a flexible tape attached at one end to a spring-loaded spool mechanism connected to a trigger where the spring loaded spool mechanism is located within a housing for holding the device. The tape is threaded through at least one pole segment and is attached to a tool which can be actuated by a pulling or pushing motion of the tape.

Abstract: A ring magnet is attached to an outer ring by a magnet holding unit. A coil hold unit attached with a generator coil is provided at an inner ring to face the ring magnet. A substrate with a transmission circuit and a loop antenna is attached to the coil hold unit. Rotation of the inner ring causes the generator coil to generate power. The generated power is applied to the transmission circuit. A sensor output or the like is transmitted by the transmission circuit as a weak wave via the loop antenna to be received at the stationary side.

Abstract: A dual resolver device that includes a first resolver having a first rotary shaft, and a second resolver having a second rotary shaft, wherein the absolute value of a difference between a shaft angle multiple of the first resolver and a shaft angle multiple of the second resolver is 1. In one embodiment, the dual resolver device further includes a torsion bar connecting the first and second rotary shafts. In another embodiment, the first and second rotary shafts constitute different portions of the same rotary shaft. In either embodiment, the first resolver preferably produces an output indicative of a rotation angle of the first rotary shaft, and the second resolver preferably produces an output indicative of a rotation angle of the second rotary shaft. The dual resolver device preferably further includes a processor that determines an absolute shaft rotation angle in response to the first and second outputs, and the shaft angle multiples of the first and second resolvers.

Abstract: An inductive transformer for transmitting measurement data and/or electrical energy between two components (1, 2) moving relative to one another includes one primary and one secondary transformer part (4, 5), in which a gap is formed between the moving components (1, 2). A slide ring (6; 7), which is made of a plastic with embedded ferromagnetic metal parts is disposed in the gap. The metal parts are distributed nonhomogeneously in the plastic, such that their proportion, on the end with which it is solidly disposed on one of the components (1, 2), is high and becomes relatively slight toward the end with which it rubs against the respective other component (1, 2).

Abstract: A scale and a detecting head each include input/output connectors. Either of the input/output connectors is connected to receiving-side connector. By connecting the receiving-side connector to either of the scale and the detecting head, which is fixed in use, there is no change that a receiving-side cable will be disconnected by movement of the counterpart of the fixed member. This results in improvement of the reliability. Additionally, device is operable at high speed since the cable does not restrict motion of the movable member.

Abstract: A rotary variable differential transformer apparatus for determining angular position of a rotor includes a stator support structure, a first pair of magnetically permeable stator elements and a second pair of magnetically permeable stator elements. The first and second pairs of stator elements are connected via first and second connecting members, respectively and are substantially supported by the stator support structure. Circuitry for generating a position indicator signal, including an array of coils is coupled to the first and second pairs of stator elements. A rotor is mounted within the stator support structure and substantially surrounded by the first and second pairs of stator elements. The rotor has a magnetic flux conducting element mounted thereon, which couples each of the first and second pairs of magnetically permeable stator elements in a manner which varies in proportion to the angular position of the rotor.

Abstract: The Static Generator is a pair of centerless, concentric counter-rotating donut forms which produce an electric current.

Abstract: A rotary variable differential transformer apparatus for determining angular position of a rotor includes a stator support structure, a first pair of magnetically permeable stator elements and a second pair of magnetically permeable stator elements. The first and second pairs of stator elements are connected via first and second connecting members, respectively and are substantially supported by the stator support structure. Circuitry for generating a position indicator signal, including an array of coils is coupled to the first and second pairs of stator elements. A rotor is mounted within the stator support structure and substantially surrounded by the first and second pairs of stator elements. The rotor has a magnetic flux conducting element mounted thereon, which couples each of the first and second pairs of magnetically permeable stator elements in a manner which varies in proportion to the angular position of the rotor.

Abstract: A magnetic induction device having at least one secondary induction assembly including a secondary winding is mounted on a rotary element. A magnetic flux is induced the secondary induction assembly, causing an induced secondary alternating current in the secondary winding of the secondary induction assembly. The secondary alternating current is converting to direct current and is stored in an electrical storage device.

Abstract: Isolation transformer comprising primary and secondary cores (2, 4) and primary and secondary coils (3, 5), the primary coil and the secondary coil being disposed via a gap G provided between both the coils and a transmission control apparatus using the isolation transformer. The primary coil (3) and the secondary coil (5) have at least substantially parallel two sides in a sectional shape of windings forming both the coils, the length of the substantially parallel two sides being set to be longer than a distance between the substantially parallel two sides and are wound such that they overlap each other via the substantially parallel two sides.

Abstract: The method and apparatus for supplying power to a rotary element by magnetic induction. A magnetic induction device having at least one secondary induction assembly including a secondary winding is mounted on the rotary element. A magnetic flux is induced the secondary induction assembly, causing an induced alternating current in the secondary winding of the secondary induction assembly. The secondary alternating current is converting to direct current and is stored in an electrical storage device. A rotary cathode plater is disclosed as a particular application of the apparatus by which power is transferred to a storage battery or high capacity capacitor, without the use of wires.

Abstract: In an electromagnetic induction type displacement sensor, two coil patterns are formed on a substrate included in a scale. The coil patterns alternate with each other in the sensing direction of the sensor and are deviated in spatial phase from each other by a quarter pitch. An idle pattern portion is included in one or both of the two coil patterns in order to provide them with the same impedance. Even when sinusoidal voltages, which are different in phase by 90 degrees, are respectively applied to the coil patterns, the resulting magnetic fields are identical and insure accurate displacement detection.

Abstract: A Rotary Variable Differential Transformer, having a short axial length, small diameter, and a wide angle, linear output range, is provided. The Rotary Variable Differential Transformer (RVDT) comprised of a housing, a hollow cylindrical coil form made of non-magnetic, non-conductive material, about which a first and second secondary coils, adjacent to each other, are circumferentially wound. A primary coil is circumferentially wound about a segment of said first secondary coil, and about a segment of said second secondary coil.An elongated ferromagnetic core is disposed within the hollow coil form. The core is an axial section of a ferromagnetic cylinder which serves to couple said primary coil to said secondary coils.The output voltage measured across said secondary coils terminals is indicative of the angular position of said ferromagnetic core relative to the coil form assembly.

Abstract: An electromagnetic actuator with position sensor includes a core made of a soft magnetic material, a permanent magnet located adjacent the core for providing a magnetic field in the core and an electrically conductive drive coil wrapped about a first portion of the core. The drive coil is supported such that the drive coil can move along the first portion of the core. An electrically conductive sense coil is wrapped about a second portion of the core and fixed relative to the core such that there is substantially no relative movement between the sense coil and the core. When an electrical current is passed through the drive coil, the drive coil moves along the first portion of the core and an electrical current is induced in the sense coil which indicates the position of the drive coil relative to the first portion of the core.

Abstract: A magnetic levitation transport system includes magnetic levitation vehicles each driven by a linear motor to run along a track. Induction lines extend through predetermined blocks of the running track to transmit a high frequency sine-wave current. Each vehicle includes electromagnets to attract levitating magnetic members extending along the running track, a pickup coil resonant with a frequency of the induction lines to generate an electromotive force, and a battery chargeable by the pickup coil. The electromagnets receive power from the pickup coil and/or the battery.

Abstract: A mixture of disaccharide esters of 3-methylpentanoic and acetic acid is prepared and used as flavor precursors. The esters average at least 4 and preferably at least 4.5 3-methylpentanoyl groups per disaccharide moiety, with remaining positions being substantially occupied by acetyl groups. Suitable disaccharides are sucrose and lactose. Preferably the disaccharide ester has an acetyl/methylpentanoyl group ratio of about 2.3 to 3.2:4.8 to 5.7. The disaccharide esters are suitable for flavoring products undergoing a heating step during preparation or consumption, such as ingredient mixes for extrusion, frying or baking, and especially tobacco. On heating they liberate 3-methylpentanoic acid and/or its decomposition products.

Abstract: An improved transcutaneous energy transfer (TET) device comprises a primary winding for placement on or near a skin surface, and a secondary winding for implantation under said skin surface. A field effect transistor (FET) is arranged to switch said primary coil across an external DC power supply. A tuning capacitor is linked to said primary coil whereby said primary coil, when said FET is turned off, will resonate at its natural frequency thereby compensating for drift in component values and reducing power transfer sensitivity to component drift. In an alternative aspect of the invention, a bidirectional communications link is provided for the transfer of data across a boundary layer by infrared signals. A plurality of transmitters are arranged in a circular pattern on one side of the boundary layer, whereas a receiver is positioned within the circular pattern along the opposite side of the boundary layer.

Abstract: An inductive type proximity switch (S) includes an open-ended loop (L3) adjacent to the inductor (L1, L2) of the parallel resonant circuit of its main (LC) oscillator. A high speed bistate switch (S1) is connected between the ends of the loop (L3). A pulsed input to the switch (S1) causes sequential making and breaking of a connection between the ends of the loop (L3) whereby the loop (L3) functions as a Faraday shield to inhibit mutual inductive linking of the inductor (L1, L2) with an inductor (L4) of a passive (LC) resonant circuit (L4, C4) of a target (T) when the target (T) is in proximity with the proximity switch (S) and the connection between the ends of the loop (L3) is made by the bistate switch (S1).

Abstract: For enabling a resolver to have absolute position sensing over a wide displacement range while still obtaining the resolution, accuracy and precision obtainable by operation in an incremental mode, the resolver is provided with a number of terminals for providing offset pitch phase indications as a function of position. A microcomputer is programmed to execute a decoding procedure for reading the offset pitch phase indications and from them computing the absolute position. This method is applicable to linear as well as rotary position sensing. By using multiplexing, digital signal processing and large-scale circuit integration of interfacing the resolver to the microcomputer, the method can achieve absolute position sensing with high reliability and low cost. The offset pitch phase indications are readily provided by inductive coupling between a multiplicity of windings, including a set of offset pitch windings connected to the terminals.

Abstract: A position sensor device is provided which inductively measures the change in position of a shorted conductive loop coil that is oriented to move in conjunction with the machine part to be measured relative to a stationary assembly. The stationary assembly is made up of a magnetic field generator and a sensor, which are oriented to respectively create and receive the magnetic field which is coupled to the loop. As a result, displacement of the coupling coil varies the degree of coupling between the generator and sensor such that the magnitude of the induced electrical current is representative of the location of the loop relative to the stationary assembly. The device can be used for measuring angular rotation, linear position and the angle of rotation, and linear movement with respect to displacement from a predetermined null position.

Abstract: A non-contacting position sensor has an exciting coil in a plane and has a sensing coil in an intersecting plane so sensing coil portions are symmetrical around an exciting coil portion in mutually inductive relation to that portion of the exciting coil portions. A ferrite member magnetically shields those sensing coil portions from other portions of the exciting coil and a housing mount the sensor for relative movement with respect to magnetically permeable or electrically conductive inductance-modifier on an object whose position is to be monitored. Movement of the inductance-modifier as the object moves modifies mutual inductance between the respective sensing coil portions and the exciting coil portion so that, when the exciting coil is driven, the sensing coil provides a signal representative of the object position. If desired, an additional sensing coil is disposed in a third plane to provide X-Y position sensing.

Abstract: An a-c current sensor for measuring the current which flows in a conductor has an insulating frame having a central compartment open at its upper end and encompassed by a U-shaped receptacle for a bent portion of the conductor. A coil is housed in the central compartment. The frame is slidingly mounted within a sleeve made of a soft magnetic material and having two assembled half-shells. The voltage generated by the current across the coil is proportional to the intensity of current flow.

Abstract: A position-measuring transformer having a pair of confronting relatively movable supports (12, 14) upon the confronting faces (16, 18) of which lie patterns of conductors is disclosed (26, 50). The conductors (26, 50) on the respective supports (12, 14) are dimensioned, configured, and positioned in such a way that portions of the conductors of one support confront portions of the conductors of the other support. When the conductors of one support are energized, a coupling effect is produced in the conductors of the other support. This coupling effect varies as a function of the relative position of the conductors, i.e., the relative position of the support. The energized conductors comprise a pattern of strip-like conductors (30, 88, 116) placed side by side. The conductors in which the coupling effect is produced are of two configurations. The "fine data" pattern comprises strip-like conductors (116) placed side by side in a pattern similar to that of the energized conductors (30).

Abstract: A rotor telemetry apparatus 60 for providing a data communication link between a rotating member 68 and a stationary member 66 of a rotary machine is disclosed. The rotor telemetry apparatus includes a pair of coils 72 each mounted on an associated member for transferring electrical energy between the stationary member 66 and rotating member 68 of the turbomachine. At least one coil of the pair of coils is held by a first layer 88 of bonding agent and is attached to one of the members by a second layer 90 of bonding agent which is filled with a magnetizable material having a magnetic permeability under operating conditions that is greater than the magnetic permeability of the bonding agent. A method of assembling the coils to the stationary and rotating members is also disclosed.

Abstract: A planar coil apparatus is disclosed for providing an output signal indicative of a movement between at least a first and a second position. A first stationary planar member has disposed on a surface, a first flat coil configuration which is emplaced thereon by a printed circuit or similar technique. Located adjacent to this coil on the board is a second coil of similar configuration. A drive signal such as that obtained from an AC or pulse source is applied to the input terminals of one of the coils which constitutes the drive coil. A second planar board is positioned relatively congruent and above the first board and has located thereon a closed coil configuration which constitutes a closed coil loop. As this movable board is brought into proximity with the stationary board, magnetic flux is coupled via the loop from the drive coil to the second coil which serves as the sense coil.

Abstract: A pressure or force transducer capable of miniaturization. Preferably, the transducer takes the form of a "contact lens" and is applied to the eyeball to permit intra-ocular pressure to be measured.

Abstract: An electrical frequency responsive circuit comprising a first coil constructed of wire having an insulating coating thereon wound in a single layer about an axis of generation, and a second coil, also constructed of wire having an insulating coating thereon wound about an axis of generation in a single layer, said coils being axially related and having diameters and/or pitch to provide inductance and capacitance between the coils which is at least initially adjustable whereby the circuit is responsive to an electric signal having a predetermined electrical frequency imposed across the coils to provide frequency band suppression about the predetermined frequency.

Abstract: An arrangement for obtaining an electrical signal corresponding to a distance comprising a conductor loop which is adapted to be arranged in a magnetic a-c field with its plane transverse to the field and which is formed into first and second conductor sections. The conductor sections extend from the respective ends of the loop to a stationary member and the arrangement is further provided with a movable adjusting means whose movement corresponds to the aforesaid distance. The adjusting means is arranged so that a first portion of the first conductor section extends from its respective loop end to the adjusting means and a second portion thereof extends from the adjusting means to the stationary member. The adjusting means is further provided with a deflecting means for offsetting the second conductor portion from the first conductor portion.

Abstract: An apparatus for charging an electrical energy source secured within a water-tight or hermetically sealed housing. The apparatus includes a transformer having a primary and secondary coil. The secondary coil is secured within the housing, whereby the housing need not be opened to effect charging of the electrical energy source.