Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F3/00—Cores, Yokes, or armatures
  • H01F3/10—Composite arrangements of magnetic circuits
• • 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
  • H01F27/24—Magnetic cores
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F37/00—Fixed inductances not covered by group H01F17/00
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
  • H01F38/02—Adaptations of transformers or inductances for specific applications or functions for non-linear operation
  • H01F38/06—Adaptations of transformers or inductances for specific applications or functions for non-linear operation for changing the wave shape
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
  • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
  • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
  • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
  • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
  • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
  • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters

Definitions

• the present invention relates to a three-phase reactor and a magnetic core for such a reactor.
• Chokes in the electrical engineering sense, are well known. Depending on the application, they have a filtering effect. In particular at the output of an inverter, they serve to ensure that a pulse-width-modulated current runs as sinusoidally as possible, before it is fed into an electrical supply network. Accordingly, the respective throttle between the inverter and the electrical supply network is arranged here, is to be fed into the.
• This approximately Stammmige magnetic core has a very high magnetic permeability, so that determine the electrical properties of the throttle substantially through the windings.
• Such a magnetic core is relatively easy to produce by the layering of stamped sheets.
• the disadvantage is that such a three-phase choke is not completely symmetrical, because two coils are arranged on each of an outer magnetic leg, whereas one of the coils is disposed on a magnetic leg between the two outer legs.
• the magnetic fields of the windings namely in particular between the two outer windings on the one hand and the winding arranged centrally in between, on the other hand, can differ.
• There may be any stray fields and that for the middle Winding effective magnetic resistance may be slightly less than the effective each for the two outer windings magnetic resistance.
• Such a three-phase reactor requires a three-phase system in which the sum of the currents is zero. In other words, it assumes a system or is used in a system that does not use or need a neutral.
• the present invention is therefore based on the object to address at least one of the above problems.
• an improved three-phase choke is to be created, which can also take into account an asymmetrical portion of a three-phase system.
• At least an alternative solution should be found.
• a magnetic core for a three-phase choke is thus proposed according to claim 1.
• Such a magnetic core has a first, second and third magnetic leg for receiving a first, second or third electrical winding of a first, second and third electrical phase, wherein the first, second and third legs are arranged in a star shape or a triangular shape.
• these three legs are arranged star-shaped relative to a common center.
• these three legs are aligned parallel to one another and parallel to a common longitudinal direction or longitudinal axis and each have connecting legs which meet at a common center. They are arranged in a star shape with respect to this center.
• These connecting legs are arranged in a plan view, namely in a view along the longitudinal axis, approximately Y-shaped.
• these three connecting legs in plan view at an equal angle, namely in each case of 120 °, to each other. In principle, however, too be provided different angles.
• the three magnetic legs namely the first, second and third magnetic legs, which can also be referred to as the main leg, are distributed uniformly around the common center, namely offset relative to this center by 120 ° to each other.
• the three main legs are arranged in a star shape. If you connect them directly through three imaginary lines, a triangle is created and, to that extent, the three main legs are arranged in triangular form.
• the three main legs are not arranged in a straight line to each other.
• the three main legs are arranged so that they form the vertices of an imaginary, equilateral triangle.
• a fourth magnetic leg is provided and the first, second and third legs are arranged in a star shape with respect to this fourth magnetic leg.
• the fourth magnetic leg may be prepared to receive a fourth winding.
• the fourth magnetic leg is preferably made smaller than the first, second and third leg, that is smaller than the main leg.
• the fourth leg can carry a magnetic field, which can be due to asymmetries of the three-phase system. These include in particular unbalanced harmonics. Accordingly, can be expected in the fourth leg with magnetic alternating fields of high frequency, compared to the frequency of the fundamental phase of the current of the three-phase system.
• the fourth leg may be provided to carry out the fourth leg as a ferrite core or as a ferrite rod.
• a ferrite rod is particularly suitable for driving high-frequency magnetic alternating fields.
• a winding may be provided on the fourth leg.
• the first, second and third legs and possibly the fourth leg are arranged parallel to each other. They can be connected to the magnetic core of the three-phase choke on two sides by means of three connection legs connected to one another in approximately Y-shaped fashion.
• the fourth limb is provided here as a central limb, if present, and forms both a magnetically center, and in mechanical terms for the stable connection of these two Y-shaped sets of connecting limbs.
• first, second and third legs are arranged at a same, first distance from one another and / or are arranged at the same distance to the fourth leg, thereby mechanically and magnetically forming a symmetry.
• the first, second and third legs are each connected via at least one magnetic connecting leg, in particular in each case via two magnetic connecting legs with the fourth magnetic leg.
• the three main legs and the fourth leg parallel to each other and the connecting legs transversely, in particular at right angles thereto.
• the first, second and third legs are magnetically connected in parallel with each other. Preferably, they are also connected in parallel to the fourth leg. Ideally, the three magnetic fields of the three main legs in the fourth leg are superimposed by this parallel connection to zero. Or arise in the fourth leg in this superposition, only the unbalanced shares, which can be detected in a possible fourth winding of the fourth leg as a corresponding current and can be removed or connected via a corresponding interconnection with a neutral or otherwise.
• the first and second legs form part of a first magnetic circuit
• the second and third legs form part of a second magnetic circuit
• the third and first legs form part of a third magnetic circuit.
• a magnetic field with a mean path length can be correspondingly guided, wherein the first, second and third magnetic circuits have an equal length, in particular equal average path lengths of one respective leading length. have the magnetic field.
• they have the same magnetic resistance, in particular without providing an air gap for this purpose.
• a three-phase choke is also proposed, which is provided with a magnetic core of a three-phase choke according to at least one of the embodiments described.
• a three-phase choke thus has a first, second and third magnetic leg, which carries a first, second or third winding of a first, second and third electrical phase.
• Such a three-phase choke can thus realize the advantages and options afforded by the underlying magnetic core.
• the fourth magnetic leg carries a fourth winding and is prepared for guiding an unbalanced magnetic component of a three-phase system. Additionally or alternatively, the fourth winding is prepared for guiding an asymmetrical electrical component of a three-phase system.
• the proposed solution provides a symmetrical three-phase choke in which any imbalance components that appear in the fourth leg and / or that occur in the fourth winding are not due to any imbalances of the three-phase choke, but actual asymmetries of the three-phase system reflect.
• An insert can find such a three-phase choke, in particular at the output of a frequency inverter. In particular, when it is intended to be fed with such into a three-phase electrical supply system.
• a symmetrical, in particular as proposed star-shaped three-phase choke thus leads to the fact that only those asymmetrical currents occur, which are actually generated by the inverter, in particular the control of the valves or semiconductor switches.
• the asymmetry, namely the unbalanced components, smaller and accordingly also a load of the semiconductor switches, ie the IGBTs is uniform and in the result smaller.
• cooling of the winding is uniform with uniform distribution of the main leg.
• the legs of the throttle are each mechanically offset by 120 °.
• the magnetic distances are preferably the same from limb to limb, namely from main limb to main limb.
• the fourth leg can consist of a ferrite core or a ferrite rod, in order to take into account high-frequency alternating currents with a small amplitude. At least one of the embodiments shown thus provides symmetry, equal inductance values and better air cooling through larger free copper surfaces.
• Fig. 1 shows a three-phase throttle in a perspective principle view.
• Fig. 2 shows a three-phase throttle as a schematic representation in a plan view.
• FIGS. 1 and 2 are schematic diagrams that may therefore differ in detail from concrete values such as concrete dimensions of an underlying subject matter and thus also among themselves, without this having any significance for the described subject matter.
• the magnetic core 20 has a first magnetic leg 1, a second magnetic leg 2 and a third magnetic leg 3, which may also be referred to as main legs 1, 2 and 3.
• the magnetic core 20 has a fourth magnetic leg 4 seen.
• the three skin limbs 1, 2 and 3 are each connected via an upper connecting leg 6 and a lower connecting leg 8 with the fourth leg 4.
• each of the three main legs 1, 2 and 3 is connected to each of the two remaining main legs 2, 3 or 3, 1 and 1, 2 via two upper connecting legs 6 and two lower connecting legs 8.
• All legs of FIG. 1, namely the three main legs 1, 2 and 3, the fourth leg and the two connecting legs 6 and 8 are shown only schematically as a line.
• the three main legs 1, 2 and 3 are the same thickness and the connecting legs 6 and 8 are also the same thickness per se.
• the fourth leg 4 is significantly thinner than the main legs 1, 2 and 3.
• first, second and third legs carry a first, second or third winding Li, l_2 or I_3, which may also be referred to as the main winding
• the fourth leg carries a fourth winding L 4 .
• the three main windings L- 1 , L 2 and L 3 are the same large dimensions and the fourth winding L 4 can be substantially smaller dimensions than the three main windings L- ⁇ , L 2 and L 3 .
• the fourth winding L 4 in terms of number of turns and / or in terms of line cross section of each turn designed considerably smaller be.
• the three main windings L- 1 , L 2 and L 3 are each connected to one phase of a three-phase system.
• the fourth winding L 4 may be connected to a neutral conductor.
• the three upper connecting legs 6 are each arranged at an angle of 120 ° to each other. The same applies to the three lower legs 8.
• the lengths of the three upper connecting legs 6 and the three lower connecting legs 8 are of equal length and the three main legs 1, 2 and 3 are correspondingly symmetrical to each other and in particular arranged in a star shape around the fourth leg 4 ,
• FIG. 2 shows schematically a top view of the three-phase throttle 10 of FIG. 1.
• the three upper connecting legs 6 are arranged at an equal angle to one another, namely 120 ° to each other. Accordingly, there is a symmetrical arrangement of the three main windings L- 1 , L 2 and L 3 to each other.
• the three main windings L- 1 , L 2 and L 3 are mechanically arranged uniformly around the fourth winding L 4 .
• Fig. 2 illustrates in particular the star shape of the arrangement of the three main legs 1, 2 and 3, which occur here only as a point at the end of the respective upper connecting leg 6 in appearance.
• FIG. 3 illustrates a perspective view of a possible specific embodiment of the three-phase choke 310, in particular of the magnetic core 320.
• the magnetic core 320 has a first, second and third magnetic leg 301, 302 and 303.
• Each of these three main legs 301, 302 and 303 has a winding L- 1 , L 2 and L 3 , which, however, are shown only schematically so far to the required winding space or even the required space for these windings Li, L 2 and L. 3 to clarify. Accordingly, it can be seen that each of the windings Li, L 2 and L 3 have much and the same place for radiating heat.
• a fourth leg 304 is present.
• the fourth magnetic leg 304 is connected to a connecting middle part 46.
• the main legs 301, 302 and 303 are each connected to an upper connecting leg 306 with the central connecting means 46 and thus with the fourth leg 304.
• a corresponding construction also results on the underside of the throttle 310, which can be seen only very vaguely in FIG.
• the throttle 10, in particular the individual legs 301-304, are thereby assembled and also the respective magnetic circuit is closed by using stacked sheets of different lengths. By mutual overlaps of the sheets creates a correspondingly durable connection and the desired magnetic circuit can be closed.
• a symmetrical three-phase choke 10 or 310 has been proposed, which has a compact structure with symmetrical arrangement and thus symmetrical properties with respect to a three-phase system. Also with regard to the mechanical and thus thermally relevant structure, each phase of such a three-phase system is considered equal. Any unbalanced portions are thus not generated by this three-phase choke 10 or 310, but can be taken into account in the fourth magnetic leg 4 and 304 and it may possibly be provided a derivative to a neutral.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Physics & Mathematics (AREA)
• Nonlinear Science (AREA)
• Chemical & Material Sciences (AREA)
• Composite Materials (AREA)
• Inverter Devices (AREA)
• Coils Or Transformers For Communication (AREA)
• Coils Of Transformers For General Uses (AREA)
• Transformers For Measuring Instruments (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 2012
  • 2012-05-07 DE DE201210207557 patent/DE102012207557A1/de not_active Withdrawn
• 2013
  • 2013-04-24 BR BR112014027162A patent/BR112014027162A2/pt not_active IP Right Cessation
  • 2013-04-24 US US14/398,935 patent/US20150102881A1/en not_active Abandoned
  • 2013-04-24 CN CN201380024218.4A patent/CN104285263A/zh active Pending
  • 2013-04-24 AU AU2013258290A patent/AU2013258290A1/en not_active Abandoned
  • 2013-04-24 EP EP13717964.4A patent/EP2847770A1/de not_active Withdrawn
  • 2013-04-24 RU RU2014149233A patent/RU2014149233A/ru not_active Application Discontinuation
  • 2013-04-24 WO PCT/EP2013/058559 patent/WO2013167382A1/de active Application Filing
  • 2013-04-24 CA CA 2868697 patent/CA2868697A1/en active Pending
  • 2013-04-24 MX MX2014012102A patent/MX2014012102A/es not_active Application Discontinuation
  • 2013-04-24 JP JP2015510714A patent/JP2015520948A/ja active Pending
  • 2013-04-24 KR KR20147030698A patent/KR20150002731A/ko not_active Application Discontinuation
  • 2013-05-06 TW TW102116092A patent/TW201405596A/zh unknown
  • 2013-05-06 AR ARP130101534 patent/AR090946A1/es unknown
• 2014
  • 2014-09-29 ZA ZA2014/07046A patent/ZA201407046B/en unknown
  • 2014-11-06 CL CL2014003006A patent/CL2014003006A1/es unknown

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