Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F27/00—Details of transformers or inductances, in general
  • H01F27/08—Cooling; Ventilating
  • H01F27/10—Liquid cooling
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F27/00—Details of transformers or inductances, in general
  • H01F27/28—Coils; Windings; Conductive connections
  • H01F27/32—Insulating of coils, windings, or parts thereof
  • H01F27/322—Insulating of coils, windings, or parts thereof the insulation forming channels for circulation of the fluid

Definitions

• the invention relates to a device for cooling, in particular for choke coils, as well as coil windings which use such a device for cooling.
• inductors have been known which are used for damping, radio interference suppression, commutation, current limitation, suppression of undesirable frequencies or for energy storage in switching regulators and switching power supplies.
• Such coils also called inductors, are inductive passive components, which are mainly used in the field of power supply of electrical or electronic equipment or systems and in power electronics.
• the inductors consist of at least one winding of a conductor through which the full load current of the circuit flows, with windings which are wound on a bobbin and are usually provided with a soft magnetic core.
• the winding arrangement, its shape and the wire diameter, the winding and the core material determine the value of the inductance and other properties of the inductor.
• the full load current of the following circuit flows. Therefore, to keep Ohmic losses low, they often have a relatively wide cross-section.
• inductors are wound through several layers of an insulated conductor, depending on the required number of turns. Due to the electrical stress of the coil, there are thermal losses in the winding and the coil carrier or coil core. The individual winding layers are electrically isolated from each other by introducing an insulating material. Due to the necessary conductor insulation, the power density of the coils is limited because it leads to overheating in the coil core
• Another way of cooling the choke coil is a mounting on a cooling plate.
• the introduction of the cooling plate can lead to increased electrical losses due to eddy currents.
• the introduction of heat sinks increases the coil weight and the dimensions of the coil.
• mats which are used for cooling, which, however, only work with a limited bending radius of the winding or the bobbin. For smaller coil dimensions, this is no longer possible.
• a device for cooling, in particular for choke coils which comprises:
• a substantially planar mat having a first and a second surface, wherein on the two surfaces thereof lines for guiding a fluid - in particular a cooling fluid - are provided, which are interconnected by provided in the mat openings through which the fluid passes from the arranged on the first surface of the mat lines in the arranged on the second surface of the mat lines can be introduced. It is particularly advantageous in this embodiment that a uniform cooling of the Drosselspul Schemee in contact with it can be ensured.
• the special arrangement of the lines on the two surfaces of the allows Matt also a casting with the surrounding winding area. It is particularly advantageous that by the
• Grouting not only increases the mechanical stability of the choke coil, but also creates a better thermal connection. This significantly improves cooling efficiency.
• the lines for guiding a fluid have a structure that corresponds to polygons.
• Particularly advantageous in this case are regular polygon structures.
• the polygons have an even number of corner nodes. Regular polygons with a straight number of vertices allow a structure that allows a uniform mechanical load and flow through the device for cooling.
• the openings provided in the mat are each arranged in a middle of the length between two corner nodes of the fluid-carrying line. This will ensure that the cooling performance on both surfaces of the mat is about the same.
• the lines for guiding a fluid and the mat provided therewith can be produced from an elastic and / or electrically non-conductive plastic. This makes it possible to arrange the device for cooling in partial areas of the choke coil, which has slight bends. Furthermore, the use of plastics allows easy and inexpensive production of the device for cooling, which thereby has a low weight and avoids unwanted electrical losses caused, as occurs in metallic heat sinks. Due to the optimal cooling capacity, compact design of the choke coil can be carried out.
• spacers are provided which can be introduced into the surfaces of the mat which are recessed by lines for guiding a fluid.
• a further aspect of the invention relates to a coil winding, in particular of choke coils, with a device for cooling as previously described, in which the device between predetermined winding layers and / or winding areas of the coil are arranged.
• Such coil windings can be optimized in terms of their electrical performance and their thermal losses by the targeted arrangement of the device for cooling.
• the single figure shows a schematic representation of a device for cooling according to an embodiment of the invention - mat - for better illustration, a section of the mat is worked out in an enlarged perspective view.
• the device for cooling is realized as a cooling mat 10.
• the cooling mat 10 has an inlet 20, via which a fluid - in particular a cooling fluid - is introduced into the device for cooling. Through lines 4 - here for clarity, only a few of them provided with reference numerals - the fluid is passed to a drain 30 of the cooling mat 10, in which the heated cooling liquid can escape.
• the illustrated cooling mat 10 can be used particularly advantageously for cooling inductors - not shown here.
• one or more cooling mats 10 are arranged in certain winding layers and / or winding regions of a choke coil in order to be able to cool them as effectively as possible. Due to electrical stresses of the inductor, there are thermal losses in the winding and / or the bobbin or coil core, which must be dissipated as uniformly as possible.
• Such cooling mats 10 are preferably arranged, for example, in the case of rectangular bobbins with small bending radii, on the planes or slightly curved surfaces of the bobbin or on certain winding layers of the choke coil - not shown here.
• the cooling mat 10 has a structure of lines 4 for guiding a fluid, which run partly on a first and second surface 1, 2 of the mat 10.
• openings 5 are provided - even a few of them in the figure for the sake of clarity provided with reference numerals, via which the individual portions of the lines 4 are interconnected.
• the fluid from the on the first Surface 1 of the mat 10 arranged lines 4 flow in the arranged on the second surface 2 of the mat 10 lines 4 and vice versa.
• a honeycomb-like structure of the lines 4 can be seen when they are viewed as a projection on the cooling mat surface receiving them.
• the lines 4 form a regular hexagon. Since individual portions of the leads 4 are disposed on the different surfaces 1 and 2 of the mat 10, the adjacent corner nodes 6 formed by intersecting leads form Y-structures protruding from the respective surface 1, 2 of the mat 10. In this case, adjacent Y structures which form the corner nodes 6 of the hexagon are each arranged alternately on one of the surfaces 1, 2 of the mat 10. This results in recesses or lead-free areas on the respective surface 1, 2 of the mat 10, which allow casting of the mat 10 between individual winding layers or a winding layer and a coil core of the choke coil. This special arrangement is when casting with a
• Air inclusions would have a negative effect because they are a thermal insulator and thereby restrict a preferred thermal connection of the mat 10 to the elements to be cooled of the inductance coil.
• a honeycomb-hexagonal arrangement of the lines 4 has a particularly advantageous mechanical effect and, moreover, allows a uniform flow through the mat 10 with the fluid flowing through the lines 4. This increases the cooling capacity.
• spacers 3 can be introduced into the areas of the Y structures of the mat 10 which are recessed from lines 4, whereby a mechanical pressure which arises during a winding process of the choke coil can be absorbed and thereby a mechanical deformation of the mat 10 so- how their lines 4 can be prevented. In this way it is ensured that no line 4 is interrupted and thus the fluid can flow uniformly in all areas of the mat 10.
• arrangements of lines 4 are possible, which may have any shape of a polygon, but also other, for example, curved shapes.
• the preferred embodiments here have a straight corner number - here six -, whereby adjacent corner nodes 6 can be arranged alternately on the one surface 1 and another surface 2 of the mat 10. The resulting advantage has been discussed above and relates to the uniform casting of the mat 10 with the elements to be cooled of the choke coil through the intended recessed areas of the cooling mat 10th
• plastics are elastically preferred since they have a low weight, allow easy manufacture of the device for cooling, and are inexpensive.
• many of the plastics are also electrical insulators, thereby minimizing electrically induced inductor losses due to alternating voltages.
• Another advantage of elastic plastics is their ability to be deformed without being damaged. As a result, installation and a specific arrangement of the cooling mat 10 in the inductance coil are considerably favored. Reactive coils, which have such a device for cooling, have a more compact construction than conventional inductors, can be produced inexpensively and above all operated cost-effectively.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Coils Of Transformers For General Uses (AREA)

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• 2012
  • 2012-09-27 DE DE201210217607 patent/DE102012217607A1/de not_active Withdrawn
• 2013
  • 2013-09-10 CN CN201380050480.6A patent/CN104737247B/zh not_active Expired - Fee Related
  • 2013-09-10 WO PCT/EP2013/068719 patent/WO2014048726A1/de active Application Filing

Patent Citations (2)

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