30 results about "Coil geometry" patented technology

A radio-frequency coil arrangement has a number of conductor traces forming basic coils and with capacitors interconnected in the conductor traces. Conductor traces of various basic coils intersect at node points. At least one switching arrangement for selective, reversible connection of the conductor traces to form different coil geometries is provided at least some of the node points.

Methods and apparatus are provided for fabricating and constructing solid dielectric “Coiled Transmission Line” pulse generators in radial or axial coiled geometries. The pour and cure fabrication process enables a wide variety of geometries and form factors. The volume between the conductors is filled with liquid blends of monomers, polymers, oligomers, and / or cross-linkers and dielectric powders; and then cured to form high field strength and high dielectric constant solid dielectric transmission lines that intrinsically produce ideal rectangular high voltage pulses when charged and switched into matched impedance loads. Voltage levels may be increased by Marx and / or Blumlein principles incorporating spark gap or, preferentially, solid state switches (such as optically triggered thyristors) which produce reliable, high repetition rate operation. Moreover, these Marxed pulse generators can be DC charged and do not require additional pulse forming circuitry, pulse forming lines, transformers, or an a high voltage spark gap output switch. The apparatus accommodates a wide range of voltages, impedances, pulse durations, pulse repetition rates, and duty cycles. The resulting mobile or flight platform friendly cylindrical geometric configuration is much more compact, light-weight, and robust than conventional linear geometries, or pulse generators constructed from conventional components. Installing additional circuitry may accommodate optional pulse shape improvements. The Coiled Transmission Lines can also be connected in parallel to decrease the impedance, or in series to increase the pulse length.

A lift-assist system for a man-way cover includes a unitary spring mounted to the axis of rotation for the man-way cover. The spring includes a coil portion on either side of the axle of rotation, with a unitary bridge portion spanning between the coil portions. The bridge portion of the spring presses down on a cantilevered extension of the man-way cover, called a duck bill. A first predetermined spacing is provided between the coil portions and the axle and second predetermined spacing is provided between the ends of the coil portions and the mounting of the axle. These predetermined spacings accommodate the variations in the coil geometry as the man-way cover moves from a fully shut position to a fully open position and vice versa.

In MRI by excitation of nuclear spins and measurement of RF signals induced by these spins in the presence of spatially-varying encoding magnetic fields, signal localization is performed through recombination of measurements obtained in parallel by each coil in an encircling array of RF receiver coils. Through the use of magnetic gradient fields that vary both as first-order and second-order Z2 spherical harmonics with position, radially-symmetric magnetic encoding fields are created that are complementary to the spatial variation of the encircling receiver coils. The resultant hybrid encoding functions comprised of spatially-varying coil profiles and gradient fields permits unambiguous localization of signal contributed by spins. Using hybrid encoding functions in which the gradient shapes are thusly tailored to the encircling array of coil profiles, images are acquired in less time than is achievable from a conventional acquisition employing only first-order gradient fields with an encircling coil array.

A radio-frequency coil arrangement has a number of conductor traces forming basic coils and with capacitors interconnected in the conductor traces. Conductor traces of various basic coils intersect at node points. At least one switching arrangement for selective, reversible connection of the conductor traces to form different coil geometries is provided at least some of the node points.

In a method and magnetic resonance apparatus for determining absolute three-dimensional reception sensitivity maps for reception coils in a scanner of the magnetic resonance, in particular a scanner having a basic magnetic field strength of at least 3 T, in the presence of a subject under examination that affects the reception sensitivity, spatially resolved subject parameters are determined, which specify electromagnetic properties of the subject under examination, and coil-geometry parameters are determined, which specify the spatial arrangement of the reception coils in the magnetic resonance scanner. The reception sensitivity maps are determined by simulation in a model specified by the subject parameters and the coil-geometry parameters.

A transceiver antenna has a transmit antenna coil defining a substantially closed transmit coil geometry circumscribing a transmit coil inner area. The transmit antenna coil is configured to conduct a current to generate a magnetic field. One or more receive antenna coils each define a closed receive coil geometry with a number of coil turns. The receive antenna coils are positioned to define one or more inner areas located within the transmit antenna coil inner area and one or more outer areas located outside of the transmit antenna coil. The inner areas and the outer areas of the receive antenna coil(s) are configured so that a first voltage induced by the transmit magnetic field into the outer areas of the receive antenna coils is attenuated by a second voltage induced by the transmit magnetic field into the inner areas of the receive antenna due to phase cancellation.

Methods and systems a method of assembling a proximity probe are provided. The method includes determining a coil wire dimension and coil geometry for the probe such that a resistance versus temperature profile of the coil is approximately constant when the coil is excited with an excitation frequency of approximately 150 kilohertz to approximately 350 kilohertz, and adjusting the coil geometry such that a resistance versus temperature profile of the coil is substantially constant.

The invention relates to a measuring arrangement comprising: a coil arrangement for creating a magnetic field to measure a sample to be arranged in connection with it including at least one flat coil, the coil geometry of which is arranged to be changed in the direction of the plane defined by the coil arrangement, in order to create a spatially changing magnetic field having a known distance dependence for measuring the sample; and electronics connected to the coil arrangement for creating a magnetic field using the coil arrangement; and means for changing the position of the sample and the coil arrangement relative to each other in order to change the magnetic field affecting the sample and having the known distance dependence. In addition, the invention also relates to a method for measuring a sample.

The present invention relates to a parametric modeling method applicable to the coil at the end of the stator winding of a generator, characterized in that the steps are as follows: Step 1, inputting the geometric parameters of the coil; Step 2, defining the cross-sectional shape of the coil; Step 3, Modeling of the geometric model of the end coil; step 4, establishing a finite element model of the coil. The invention has the advantages of parametrizing the modeling of the end coils of the stator winding and simultaneously establishing the finite element model of the end coils so as to be applied to the research on the vibration characteristics of the stator winding end structures.

The invention provides an electrical performance parameter calculation method of wireless charging coil self-inductance and mutual inductance, and belongs to the field of new energy vehicles and electromagnetism. The method comprises the steps of firstly obtaining a zoom table of a self-inductance function, a self-inductance correction coefficient, a mutual inductance function and a mutual inductance correction coefficient of coils in different shapes; obtaining geometrical parameters, including the coil size, the wire radius, the number of turns of the coil, the longitudinal distance betweentwo coils and the transverse offset between the two coils, of any coil to calculate dimensionless parameters; utilizing the geometrical parameters and the dimensionless parameters to obtain the self-inductance function, the self-inductance correction coefficient, the mutual inductance function and the mutual inductance correction coefficient according to the coil shape through the zoom table; finally utilizing a formula to calculate to obtain electrical properties, including the self-inductance coefficient, the mutual inductance coefficient and a mutual inductance coupling coefficient, of thecoil. By utilizing the geometrical parameters of the coil and through table look-up and formula calculation, an accurate calculation result of the self-inductance coefficient and the mutual inductancecoefficient of the coil can be obtained, and the method is simple and has very high popularization value.