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U-Core biography, U-Core discography
The magnetic core is a key component in electrical and electromechanical devices such as electromagnets, transformers and inductors.The properties of the device will depend crucially on the following factors:
the geometry of the magnetic core.In this type of inductor radiation occurs at the end of the rod and electromagnetic interference may be a problem in some circumstances.Single "I" core
Like a cylindrical rod but square, rarely used on its own.This type of core is much used for power transformers, autotransformers, and inductors.Pair of "E" cores
Again used for iron cores.Pot core
Usually ferrite or similar.This is used for inductors and transformers.Toroidal core
This design is based on a circular toroid, similar in shape to a doughnut.The coil is wound through the hole in the doughnut and around the outside, an ideal coil is distributed evenly all around the circumference of the doughnut.This design is excellent for mass production and allows a high power, small volume transformer to be constructed for low cost.It is not as ideal as either a pot core or toroidal core but costs less to produce.Core loss
In a transformer or inductor, some of the power that would ideally be transferred through the device is lost in the core, resulting in heat.Common magnetic core materials
Having no magnetically active core material (an "air core") gives incredibly poor performance in most situations, so a wide range of ferromagnetic materials are used to concentrate the field.Soft iron
"Soft" iron is used in electromagnets and in some electric motors; and it can create a field as much as 50,000 times more intense than with an air core.Iron is desirable to make magnetic cores, as it can withstand high levels of magnetic field (up to 2.Although iron is a relatively good conductor, it cannot be used in bulk form with a rapidly changing field, such as in a transformer, as intense eddy currents would appear due to the magnetic field, resulting in huge losses (this is used in induction heating).Lamination
Laminated magnetic cores are made of thin, insulated iron sheets.Using this technique, the magnetic core is equivalent to many individual magnetic circuits, each one receiving only a small fraction of the magnetic flux (because their section is a fraction of the whole core section).GNO), GO is most desirable for magnetic cores.As the magnetic field in inductor and transformer cores is static (compared to that in electric motors), it is possible to use GO steel in the preferred orientation.This is equivalent to a microscopic laminated magnetic circuit (see silicon steel, above), hence reducing the eddy currents.The ferrite materials can be engineered with a wide range of parameters.Over the past 25 years, the energy industry has designed a host of alternative technologies, from solar panels and windmills, to hydroelectricity and advanced biofuels.With growing demand and an environmental crisis now at critical mass, where do we turn for a clean, practical and proven energy source?Nuclear energy is a proven and reliable alternative to fossil fuels.The Ucore AdvantageUcore Uranium (UCU:TSXV ; UURAF:OTC) is a Canadian uranium exploration company.Canada is the largest producer of uranium worldwide, with an historical geology conducive to uranium ore genesis.Ucore has significant prospective uranium holdings across North America.With land claims spanning a total of 15 projects and counting, and with a management team comprised of experienced mineral exploration personnel, Ucore is positioned for rapid expansion in a sector exhibiting exponential growth.Your Application is Due by February 29, 2008
Go the Eligibility and Application page for a link to the application form.University of Oregon to prepare students
for their summer research experience.They may work as tutors for selected courses.Forum leaders can express their views through video messages.Forgot your username or password?Source for U Core manufacturers at Global Sources.The featured China U Core manufacturers and featured Taiwan U Core manufacturers listed here are sourced by the Global Sources team of industry experts.Buy China wholesale products at our convenient online store.Introducing comprehensive
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verified and unverified suppliers.Power Cord Compliant with U.Power Cord Compliant with U.Landmark Announces Approval For Merger With Ucore Uranium Inc.Start a discussion about
Ucore Uranium Inc.UCORE URANIUM INC at Cambridge House International Inc.Ucore), formerly Birchpoint Capital Inc.On September 26, 2006, the Company acquired Hot Rock Uranium Corp.Hat property, bringing the total claim units on this property to 111 covering 2,775 hectares.The U cores are spaced adjacent to each other, having an axis defined coincident with the axis of the E core pole piece which supports the primary winding.Linear displacement between the U core and E core results in different coupling between the secondary windings and primary windings.Images are available in PDF form when logged in.Pulse producing devices4051718October, 1977Meckl et al.Apparatus for measuring the velocity of low frequency vibrations4458536July, 1984Ahn et al.Multiaxial vibration sensor5047719September, 1991Johnson et al.An array of LVDT sensors measuring displacements between surfaces comprising: a plurality of E cores supported on the base of one of said surfaces, said E cores being evenly spaced in a linear array, said E cores having first, second and third pole pieces facing another of said surfaces, said first and third pole pieces each supporting a secondary winding, said secondary windings of an E core being differentially connected together, said second pole piece supporting a primary winding connected to a source of alternating current; a plurality of pairs of U cores, supported on said another surface, each U core having a pair of pole pieces facing said E core pole pieces, forming an air gap therewith, said pairs of U cores being spaced so that at least one pair of U cores is positioned under one of said E cores as said surfaces are linearly displaced with respect to each other; and, circuit means connected to each of the differentially connected secondary windings, said circuit means blending signals received from each of the E cores, and providing an output signal representing one of said E cores which is providing a voltage proportional to the minute displacement of one pair of U cores.Specifically, a type of transducer is described for measuring the relative linear displacements between platforms.LVDT sensors have been available for measuring linear displacements.In operation the LVDT sensors require that the coaxial transformer be supported to a stationary surface while a plunger attached to the magnetic core is connected to a moving surface for measuring the relative displacement between the moving surface and stationary surface.The mounting of these structures can be difficult as normally it can only be mounted at the end of a moving surface which faces a stationary surface.It is yet another object of this invention to provide for an LVDT sensor which can be used to measure the relative change in sheer distance between two opposing surfaces moving with respect to each other anywhere along the surfaces.The E core includes three extending pole pieces of magnetic material, the middle pole piece supporting a primary winding and the two end pole pieces supporting first and second secondary windings, the windings being connected in a differential configuration.The E core is supported on a platform such that the pole pieces face a surface which is moving linearly with respect to the another platform.In a null position, each of the U core pole pieces are equally spaced from the axis passing through the middle pole piece on the E core.In the null position, the two adjacent pole pieces of the U cores each form an air gap with the E core central pole piece having the same area.The remaining two pole pieces of the U cores form air gaps with the remaining two pole pieces of the E core of equal area.LVDT sensor in accordance with the preferred embodiment of the invention.The pair of U core magnetic elements 13 and 14 are positioned so that pole pieces 16 and 17 are adjacent to each other.The remaining pole pieces 15 and 18 of the U cores 13 and 14 are spaced from the remaining pole pieces 21 and 23 of the E core.The primary winding is connected to a source of alternating voltage through terminals 30, 31 and generates magnetic flux which is coupled via the pole piece 22, air gap LG, and each of the U cores 13 and 14 to the secondary windings 26 and 28.In the null position, the coupling between each of the secondary windings 26 and 28 is equal.Pole pieces 16 and 17 each form an air gap having substantially the same surface area with respect to pole piece 22.The operation of the device of FIG.The corresponding section view FIG.This is represented by the air gap between pole pieces 18 and 23 and 17 and 22, leaving a larger surface area than that between pole pieces 16 and 22 and 15 and 21.The primary winding 27 is wound in a sense with respect to secondary windings 28 and 26 to induce a potential having the polarity shown by the dots at one end of each winding.The differential voltage is obtained across the series combination of secondary winding 26 and 28, which terminates in terminals 34 and 33.The rotating body 39 includes a pair of U cores having pole faces 41, 42, 43 and 46 opposite pole faces 40, 44 and 45 of an E core.These circumferential distance measurements will permit the calculation, along with a suitable time base, of the rotation speed of rotary surface 39.Siemens as an N41 material.The dimensions of the E and U cores are given in FIG.The circuit shown for exciting the winding 27 and measuring the differential voltage from secondary windings 26 and 28 is shown more particularly in FIG.Various components are shown, including capacitors and resistors which may be selected from the data sheet distributed by Analog Devices for this integrated circuit.Displacements of hundredths of a millimeter were made from a sensor which had a gain of 11.The LVDT processing integrated circuits (AD 598) are in turn connected to a blending circuit 55.It will provide an output signal identifying the sensor which is operating in its range, as well as the value of displacement being measured by the sensor.Those skilled in the art will recognize yet other embodiments defined more particularly by the claims which follow.Previous Patent (Velocity sensor whic...Next Patent (Position sensor with...
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