Abstract: A thermoelectric module which has at least one thermoelectric element for converting energy between thermal energy and electrical energy. The at least one thermoelectric element has a first surface and a second surface opposite the first surface. The thermoelectric module further has a first electrode, the first electrode having at least a first region which is arranged directly on the first surface and a second electrode, the second electrode having at least a second region which is arranged directly on the second surface. At least one of the first region and the second region has a metal alloy which exhibits an Invar effect.
Type:
Application
Filed:
August 10, 2012
Publication date:
February 14, 2013
Applicant:
Vacuumschmelze GmbH & Co, KG
Inventors:
Joachim Gerster, Alberto Bracchi, Michael Müller
Abstract: Magnet cores pressed using a powder of nanocrystalline or amorphous particles and a pressing additive should be characterized by minimal iron losses. These particles have first surfaces represented by the original strip surfaces and second surfaces represented by surfaces produced in a pulverization process, the overwhelming majority of these second particle surfaces being smooth cut or fracture surfaces without any plastic deformation, the proportion T of areas of plastic deformation of the second particle surfaces being 0?T?0.5.
Abstract: A current sensor comprising a primary conductor for conducting a current that is to be measured, at least two magnetic field probes for measuring magnetic fields, and a magnetic core, which has a closed ring structure having three or more corners that encloses the primary conductor, wherein each magnetic field probe is arranged on the magnetic core or in recesses in the magnetic core.
Abstract: Current sensor arrangement with a primary conductor for conducting a current that is to be measured, at least two magnetic field probes for measuring magnetic fields, and a magnetic core, which has a closed, arbitrarily formed ring structure that encloses the primary conductor, whereby a primary conductor guide for both rectangular and round primary conductors is located in a magnetic core opening that is enclosed by the magnetic core, and whereby the primary conductor guide has a solid body with a round guide opening that is arranged to overlap relative to the magnetic core opening and with a rectangular guide opening that extends over the round guide opening and that is arranged to overlap.
Abstract: A soft magnetic alloy is provided that consists essentially of 47 weight percent?Co?50 weight percent, 1 weight percent?V?3 weight percent, 0 weight percent?Ni?0.25 weight percent, 0 weight percent?C?0.007 weight percent, 0 weight percent?Mn?0.1 weight percent, 0 weight percent?Si?0.1 weight percent, at least one of niobium and tantalum in amounts of x weight percent of niobium, y weight percent of tantalum, remainder Fe. The alloy includes 0 weight percent?x<0.15 weight percent, 0 weight percent?y?0.3 weight percent and 0.14 weight percent?(y+2x)?0.3 weight percent. The soft magnetic alloy has been annealed at a temperature in the range of 730° C. to 880° C. for a time of 1 to 6 hours and comprises a yield strength in the range of 200 MPa to 450 MPa and a coercive field strength of 0.3 A/cm to 1.5 A/cm.
Type:
Application
Filed:
June 29, 2012
Publication date:
January 3, 2013
Applicant:
Vacuumschmelze GmbH & Co. KG
Inventors:
Witold PIEPER, Niklas VOLBERS, Joachim GERSTER
Abstract: A magnet core (1) made of a composite of platelet-shaped particles of a thickness D and a binder has a particularly linear relative permeability curve over a pre-magnetised constant field. For this purpose, the platelet-shaped particles (5) are provided with an amorphous volume matrix (8), wherein areas (9) with a crystalline structure having a thickness d of 0.04*D?d?0.25*D and covering a proportion x of x?0.1 of the surface (6, 7) of the particle (5) are embedded on the surface (6, 7) of the particle (5).
Abstract: An alloy is provided which consists of Fe100-a-b-c-d-x-y-zCuaNbbMcTdSixByZz and up to 1 at % impurities, M being one or more of the elements Mo, Ta and Zr, T being one or more of the elements V, Mn, Cr, Co and Ni, Z being one or more of the elements C, P and Ge, 0 at %?a<1.5 at %, 0 at %?b<2 at %, 0 at %?(b+c)<2 at %, 0 at %?d<5 at %, 10 at %<x<18 at %, 5 at %<y<11 at % and 0 at %?z<2 at %. The alloy is configured in tape form and has a nanocrystalline structure in which at least 50 vol % of the grains have an average size of less than 100 nm, a hysteresis loop with a central linear region, a remanence ratio Jr/Js of <0.1 and a coercive field strength Hc to anisotropic field strength Ha ratio of <10%.
Type:
Application
Filed:
April 16, 2012
Publication date:
October 18, 2012
Applicant:
Vacuumschmelze GmbH & Co. KG
Inventors:
Giselher HERZER, Christian Polak, Viktoria Budinsky
Abstract: A magnet core is required to be particularly dense, made of alloys produced in a rapid solidification process and have a minimal coercitive field strength. To achieve these aims, a coarse-grain powder fraction is first produced from an amorphous strip of a soft magnetic alloy. In addition, at least one fine-grain powder fraction is produced from a nanocrystalline strip of a soft magnetic alloy. The particle fractions are then mixed to produce a multi-modal powder, wherein the particles of the coarse-grain particle fraction have an amorphous structure and the particles of the fine-grain powder fraction have a nanocrystalline structure. The multi-modal powder is then pressed to produce a magnet core.
Abstract: An electric motor with a stator and a rotor, the stator and/or the rotor comprising a soft magnetic core comprising a lamination stack, is characterised, in that the lamination stack has a composition of 35% by weight?Ni?50% by weight, 0% by weight?Co?2% by weight, 0% by weight?Mn?1.0% by weight, 0% by weight?Si?0.5% by weight and 0.5% by weight?Cr?8% by weight and/or 0.5% by weight?Mo?8% by weight, residual iron and unavoidable impurities, where 0.5% by weight?(Mo+Cr)?8% by weight.
Type:
Application
Filed:
September 9, 2011
Publication date:
September 13, 2012
Applicant:
Vacuumschmelze GmbH & Co. KG
Inventors:
Witold Pieper, Burkard Kraus, Johannes Tenbrink
Abstract: A method and current sensor arrangement for measurement of a primary current in a primary conductor which is magnetically coupled to a secondary conductor via a ferromagnetic core, with a voltage of a specific amplitude being applied to the secondary conductor, such that a secondary current flows for remagnetization of the ferromagnetic core, and the secondary current is measured during the remagnetization of the core, in order to obtain a first measured value. The voltage polarity is then reversed such that a secondary current flows for renewed remagnetization of the ferromagnetic core, and the secondary current is measured during the remagnetization of the core, in order to obtain a second measured value. The primary current is calculated as a function of the first and of the second measured value, with the polarity reversal being carried out at least once at a time which occurs before that time at which the ferromagnetic core reaches its saturation magnetization.
Abstract: A powder composite core is to be particularly dense and strong while being produced from soft magnetic alloys. In particular, the expansion of the heat-treated core is to be avoided. To produce this core, a strip of a soft magnetic alloy is first comminuted to form particles. The particles are mixed with a first binder having a curing temperature T1,cure and a decomposition temperature T1,decompose and a second binder having a curing temperature T2,cure and a decomposition temperature T2,decompose, wherein T1,cure<T2,cure?T1,decompose<T2,decompose. The mix is pressed to produce a magnet core while the first binder is cured. The magnet core is then subjected to a heat treatment accompanied by the curing of the second binder at a heat treatment temperature TAnneal>T2,cure.
Abstract: The invention relates to a laminated core with soft-magnetic material and to a method for joining core laminations by adhesive force to form a soft-magnetic laminated core. The laminated core comprises core laminations made of soft-magnetic sheets, which form a core lamination stack. The core lamination stack has intermediate layers between the core laminations. The intermediate layers comprise a cured adhesive introduced in a state of low viscosity into interstices between the core laminations. For this purpose, the core laminations comprise a final-annealed, crystalline CoFe alloy, an adhesive-wettable top side and an adhesive-wettable underside. Together with the intermediate layers, the core laminations form a dimensionally accurate laminated core. The laminated core has a substantially adhesive-free contour consisting of contour surfaces of the core laminations. The adhesive is solvent-free in its low-viscosity state.
Type:
Application
Filed:
March 26, 2009
Publication date:
June 21, 2012
Applicant:
Vacuumschmelze GmbH & co. KG
Inventors:
Joachim Gerster, Witold Pieper, Harald Staubach, Dominik Fackelmann
Abstract: The invention relates to a soft-magnetic metal strip for electromechanical components, wherein the soft-magnetic metal strip has a nanocrystalline or amorphous structure. The metal strip has strip thickness to roughness ratios d/Ra of 5?d/Ra?25.
Abstract: Disclosed are a method and an array for measuring a primary current in a primary conductor that is magnetically coupled to a secondary conductor via a ferromagnetic core. In said method and array, the following is done; a voltage having a specific amplitude is applied to the secondary conductor such that a secondary current flows for reversing the magnetization of the ferromagnetic core; the secondary current is measured while the magnetization of the ferromagnetic core is reversed in order to obtain a first measured value; the polarity of the voltage is reversed such that a secondary current flows for once again reversing the magnetization of the ferromagnetic core; the secondary current is measured while the magnetization of the core is reversed in order to obtain a second measured value; the primary current is calculated in accordance with the first and the second measured value, the polarity of the voltage being regularly reversed at a certain sensor frequency that is continuously varied.
Type:
Application
Filed:
June 17, 2009
Publication date:
April 19, 2012
Applicants:
Bosch GmbH, Vacuumschmelze GmbH & Co. KG
Inventors:
Ralf Koch, Juergen Schoettle, Marcus Bremmer, Jen Doeblitz, Michael Wolf
Abstract: The invention relates to a current-compensated choke with a ring core at least two coils composed in each case of the same number of windings, wherein in the interior of the ring core a non-conductive body is arranged with holes embodied in pairs in a mirror symmetrical manner to a symmetry axis of the ring core, wherein respectively one winding is guided through each hole of at least some of the pairs of symmetrical holes, and windings corresponding to one another of different coils are guided through the two holes comprising a pair, and a method for producing a current-compensated choke of this type.
Type:
Grant
Filed:
December 18, 2009
Date of Patent:
March 20, 2012
Assignee:
Vacuumschmelze GmbH & Co. KG
Inventors:
Harald Hundt, Hartmut Schoenbohm, Dieter Proksch, Klemens Trabold, Michael Engelstädter
Abstract: An article for magnetic heat exchange comprising a magnetocalorically active phase with a NaZn13-type crystal structure is provided by hydrogenating a bulk precursor article. The bulk precursor article is heated from a temperature of less than 50° C. to at least 300° C. in an inert atmosphere and hydrogen gas only introduced when a temperature of at least 300° C. is reached. The bulk precursor article is maintained in a hydrogen containing atmosphere at a temperature in the range 300° C. to 700° C. for a selected duration of time, and then cooled to a temperature of less than 50° C.
Abstract: An article for magnetic heat exchange comprises a monolithic working component comprising two or more portions. The two or more portions comprise amounts of La, Fe, Si and of one or more elements T and R suitable to produce a La1-aRa(Fe1-x-yTySix)13Hz phase, wherein T is one or more of the elements from the group consisting of Mn, Co, Ni and Cr and R is one or more of the elements from the group consisting of Ce, Nd, Y and Pr. The amount of the one or more elements T and R and the amount of Si is selected for each of the two or more portions to provide the two or more portions with differing Curie temperatures and, preferably, a density, d, within a range of ±5% of an average density, dav, of a total number of portions.
Type:
Application
Filed:
February 11, 2011
Publication date:
February 23, 2012
Applicant:
Vacuumschmelze GmbH & Co. KG
Inventors:
Matthias KATTER, Volker Zellmann, Alexander Barcza
Abstract: An article (1) for magnetic heat exchange extends in a first direction (3) and in a second direction (5) generally axially perpendicular to said first direction (3). The article (1) comprises at least one magnetocalorically active phase (2). The average thermal conductivity of the article (1) is anisotropic.
Abstract: A working component for magnetic heat exchange comprises a magnetocalorically active phase comprising La1-aRa(Fe1-x-yTyMx)13Hz, a hydrogen content, z, 90% or higher of a hydrogen saturation value, zsat, and values of a, x and y selected to give a Curie temperature Tc. M is one or more of the elements from the group consisting of Al and Si, T is one or more of the elements from the group consisting of Co, Ni, Mn, Cr, Cu, Ti and V and R is one or more of the elements from the group consisting of Ce, Nd, Y and Pr. Tcmax is a Curie temperature of a La1-aRa(Fe1-x-yTyMx)13Hz phase comprising a hydrogen content z=zsat and said selected values of a, x and y. The working component comprises the Tc wherein (Tcmax?Tc)?20K.
Type:
Application
Filed:
February 11, 2011
Publication date:
February 23, 2012
Applicant:
Vacuumschmelze GmbH & Co. KG
Inventors:
Matthias KATTER, Volker Zellmann, Alexander Barcza