213 results about "Toroidal coil" patented technology

An analytical device for rapid, non-invasive nuclear magnetic resonance (NMR) spectroscopy of multiple samples using a single spectrometer is provided. A modified toroid cavity/coil detector (TCD), and methods for conducting the simultaneous acquisition of NMR data for multiple samples including a protocol for testing NMR multi-detectors are provided. One embodiment includes a plurality of LC resonant circuits including spatially separated toroid coil inductors, each toroid coil inductor enveloping its corresponding sample volume, and tuned to resonate at a predefined frequency using a variable capacitor. The toroid coil is formed into a loop, where both ends of the toroid coil are brought into coincidence. Another embodiment includes multiple micro Helmholtz coils arranged on a circular perimeter concentric with a central conductor of the toroid cavity.

A synchronous AC motor has a stator with stator poles arranged as a plurality of circumferentially extending stator pole groups, with each stator pole group having a pair of corresponding circumferentially extending loop-configuration stator windings disposed adjacent on either side or a single such winding disposed adjacent at one side, adjacent stator pole groups being mutually circumferentially displaced by a fixed amount corresponding to a specific electrical phase angle. A rotating magnetic field is produced by applying respective polyphase AC voltages to the windings, such that currents of mutually opposite direction flow in each pair.

A time varying current sensor is constructed using surface coils uniformly spaced around a central cavity adapted to receive the conductor through which the current to be measured flows. Accurate and uniform coil geometry is achieved using printed circuit board technology, thereby eliminating the high cost of precision toroidal coil winding. An optional hinge in the housing can allow the sensor to be easily installed on existing conductors without the need to disconnect and reconnect.

A toroidal-coil multi-phase linear stepping motor includes a cylindrical housing, an axis coaxially arranged inside the housing, a cylindrical element supported by the axis and an armature fixed to the housing around the cylindrical element through an air gap in the radial direction. The axis is fixed to the housing and the cylindrical element linearly moves along the axis. The cylindrical element has toroidal permanent magnets that are alternately magnetized in N pole and S pole in the axial direction. The armature consists of armature units arranged around the axis. Each armature unit has a toroidal coil and a pair of armature yokes that hold the toroidal coil. Each armature yoke has toroidal magnetic teeth on its inner surface. The invention also includes a toroidal-coil single-phase linear reciprocating motor and a cylinder compressor and a cylinder pump using these motors.

A method and apparatus for determining a parameter of interest of an earth formation during drilling of a borehole. A first toroidal coil antenna induces a current along a path that includes a bottomhole assembly and the formation. A second toroidal coil antenna disposed at the drillbit and oriented at a non-zero angle to the longitudinal axis of the bottomhole assembly measures an electrical signal resulting from the current, the electrical signal being a parameter of interest of the formations.

The alternating current detection coil is a toroidal coil, and comprises plural radial-line conductors which are formed on a front face and a rear face of a substrate, conductive connection parts and conductive through-holes which connect electrically each end of radial-line conductors, wherein plural winding turns are consecutively formed by a connection of each radial-line conductor on the front face and the rear face respectively, the winding turns comprise a forward coil and a backward coil, and each shape on the front face and the rear face of the radial-line conductors and the conductive connection parts are identical with each other. Consequently, when seen from a thickness direction of the substrate, areas of the forward coil and the backward coil are equal to each other, and an external magnetic field, which does not need to be detected, can be canceled each other by the forward coil and the backward coil, then a current detection accuracy can be improved.

In an X-ray generating device of the neutral grounding system, to remove an unbalance voltage generated due to difference in impedance of parallel transformer coils of the high voltage transformer and particularly an unbalance voltage involved with difference in impedance above and below the neutral points generated in a metal X-ray tube, a plurality of currents flowing in opposite directions through primary windings of the parallel transformer coils in the high voltage transformer are passed through by or wound around a common toroidal coil or wound around an outer circumference of the toroidal coil at a predetermined ratio of winding number, and the unbalance voltage occurring to the secondary side is cancelled by changing primary current with magnetic behavior.

The invention relates to a wire winding machine for an annular coil. The wire winding machine for the annular coil consists of a working platform, a motor, a wire winding actuating mechanism, a coil clamping mechanism and an electric appliance control part, wherein the wire winding actuating mechanism consists of a bracket, a wire storing ring, a supporting part, a slotting adjusting part and a pressing part; and the coil clamping mechanism consists of three clamping shafts which are uniformly distributed along a circumference, a clamping shaft opening and closing mechanism and a clamping sleeve. The wire winding machine for the annular coil is characterized in that the bracket consists of an upper bracket and a lower bracket which are rotationally connected; the slotting adjusting part consists of a first split and a second split which are respectively mounted on the upper bracket and the lower bracket; and the clamping shaft opening and closing mechanism comprises an opening actuating mechanism consisting of a driving shaft and a supporting arm, and a resetting mechanism consisting of a resetting shaft and a torsion spring. Compared with the prior art, the wire winding machine for the annular coil has the advantages that the opening and closing of the wire storing ring are realized by adjusting the second handle of the second split, two-step operation is simplified into one-step operation, the opening of the clamping shafts is realized by tightly holding a handle on the supporting arm, and bidirectional adjustment is simplified into unidirectional adjustment. Thus, the wire winding machine has the characteristics that operation is convenient, time is saved and production efficiency is improved.

The present invention provides an apparatus and method for measuring the conductivity of a fluid employing the differential radio frequency phase detection between two embedded toroidal coils.

An object of the present invention is to provide an induction heater and an induction heating method capable of heating by induction a work in which a gear portion and a shaft are integrated.

An induction heater for a gear portion and a stepped shaft is arranged in such a manner that a first heating coil (annular coil) surrounds the gear portion and that a second heating coil (linear coil) faces the stepped shaft in an axial direction. Alternating currents of different frequencies are supplied to the first heating coil 1 and the second heating coil. Further, a part of the second heating coil is arranged so as to come opposite a boundary between the gear portion and the stepped shaft, thereby connecting a hardened pattern of the gear portion by the first heating coil and a hardened pattern of the stepped shaft by the second heating coil.

An electrical connector (100) has a housing (10) defining an opening therein (101), a magnetic module (3) mounted to the housing and a shield (50) surrounding the housing. The magnetic module includes a printed circuit board (31), a first set of terminals (20) mounted to a front face of the printed circuit board and received in the opening, a second set of terminals (21) mounted to a rear side of the printed circuit board, a toroidal coil pair (32) mounted to the printed circuit board and having a first toroidal body and (321), and a second toroidal body (322) electrically connected with each other by a circuit provided on the printed circuit board.

The invention relates to a ring coil motor (1, 20) with a primary part (3, 21) and a secondary part (2, 22), wherein the primary part (3, 21) has a ring coil (6, 25) and permanent magnets (9, 27).

A multiple output magnetic induction unit includes a magnetic substrate, and a plurality of toroidal coils mounted on the magnetic substrate side by side. No insulating layer is required between the toroidal coils.

The invention relates to a device for winding a coil and to a method of using the device. The invention is particularly beneficial for winding electromagnetic coils around a closed magnetic circuit having no opening, for example in the form of a ring core. The device comprises a helicoidal channel, means for holding the ring core in a defined position within the helicoidal channel, and thrust means for thrusting the wire (10) toward the helicoidal channel. The method employing the device consists in: engaging a first end of the wire in the thrust means for thrusting the wire (10) toward the helicoidal channel; placing the ring core in its defined position; thrusting the wire into the helicoidal channel until the desired number of turns have been formed; releasing the ring core and disengaging the wire from the thrust means; and cutting a second end of the wire.