JP2016009769A - Reactor and power conversion device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reactor capable of equalizing inductance of phases, and to provide a power conversion device using the reactor.SOLUTION: A reactor 100 comprises: a magnetic core 6; and lead wires 14, 15, and 16 wound around the magnetic core. The magnetic core 6 has loop portions for AC three-phases. Each loop portion has a window 7, 8 or 9 at the center thereof so as to form a closed magnetic circuit. The loop portions for the AC three-phases are unified via a connecting portion 13, and arranged so as to extend in different directions from each other with respect to the connecting portion. Each lead wire is wound around each loop portion through the window. The reactor 100 is connected between a three-phase AC output of an inverter which supplies three-phase AC power to a three-phase AC motor and a three-phase AC terminal of the three-phase AC motor, so as to lower noise generated by a power conversion device.

Description

  The present invention relates to a reactor inserted into a power line for noise reduction and the like, and a power converter using the same.

  When the AC motor is driven by a power conversion device such as an inverter device, noise is generated by the pulse voltage output from the power conversion device to the AC motor. In order to reduce noise, a reactor is inserted into the power line that supplies the output power of the power converter to the AC motor.

  As a technique related to such a reactor, techniques described in Patent Document 1 and Patent Document 2 are known. In the magnetic core of the reactor according to the present technology, a loop portion having a window at the center is arranged in a three-phase manner in a plane.

JP 2009-135271 A JP 2011-119477 A

  However, in the reactor according to the above prior art, since the loop portion having the window at the center portion is arranged for three phases in a plane, a gap for preventing magnetic saturation is formed in the loop portion of each phase. The magnetic path formed in the loop portion located in the intermediate portion of the magnetic core is affected by the gaps formed in the loop portions located on both sides thereof. For this reason, an imbalance occurs in the inductance of each phase.

  Therefore, the present invention provides a reactor that can equalize the inductance of each phase and a power conversion device using the reactor.

In order to solve the above problems, a reactor according to the present invention includes a magnetic core portion and a conductive wire wound around the magnetic core portion, and each of the magnetic core portions has a window at a central portion thereof. A three-phase loop portion that is integrated through the coupling portion and in a different direction with respect to the coupling portion. Conductive wires are wound around each loop portion through a window portion. The power converter according to the present invention includes an inverter device that supplies three-phase AC power to a three-phase AC motor, and an inverter device A reactor connected between the three-phase AC output and the three-phase AC terminal of the three-phase AC motor, and the reactor according to the present invention is used as the reactor.

  According to the present invention, it is possible to easily equalize the inductance of each phase in the reactor by providing a loop portion that becomes a magnetic path for each alternating phase in the integrated magnetic core. Moreover, the noise which a power converter device generate | occur | produces can be effectively reduced by using the reactor by this invention.

  Problems, configurations, and effects other than those described above will become apparent from the following description of embodiments.

It is a circuit diagram of the power converter device for elevators by one Example of this invention. It is a front view which shows the core of the reactor of a present Example. It is a top view which shows the core of the reactor of a present Example. It is a top view of the reactor of a present Example. It is a perspective view of the reactor of a present Example. The magnetic path in case a gap is provided in a core is shown. The core of the reactor which is one modification is shown. The core of the reactor which is another modification is shown.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a circuit diagram showing a main part of an elevator power converter including a reactor according to an embodiment of the present invention.

  In this figure, the inverter device 1 converts a DC voltage obtained by rectifying and smoothing a commercial three-phase AC voltage into an AC voltage by switching a semiconductor power switching element such as an IGBT (Insulated Gate Bipolar Transistor) on and off. The AC voltage is converted and output from the three-phase AC output terminals U, V, and W. The AC voltage output from the inverter device 1 is applied to the three-phase AC motor 5 through a power line (not shown).

  Reactor 100 is inserted into the three-phase power line and the ground line. That is, the AC voltage output from the inverter device 1 is applied to the three-phase AC motor 5 via the reactor 100. Reactor 100 includes U-phase terminals U1 and U2, V-phase terminals V1 and V2, W-phase terminals W1 and W2, and ground line terminals E1 and E2. Terminals U1, V1, and W1 are electrically connected to output terminals U, V, and W of inverter device 1, respectively. The terminals U2, V2, and W2 are electrically connected to the U-phase terminal, V-phase terminal, and W-phase terminal of the three-phase AC motor 5, respectively. Furthermore, the terminals E1 and E2 are electrically connected to the ground potential portion E of the inverter device 1 and the ground potential portion of the three-phase AC motor 5, respectively.

  In the reactor 100, as will be described later, a reactor for three phases is configured using an integral magnetic core (hereinafter simply referred to as “core”), but in FIG. It is described as a circuit element. The normal mode reactor function 2 is a normal mode noise reduction function, and is a function using the U-phase conductor 14, the V-phase conductor 15, and the W-phase conductor 16. The common mode reactor function 3 is a common mode noise reduction function, and is a function by the U-phase conductor 14, the V-phase conductor 15, the W-phase conductor, and the core 6 for three phases. Further, the function 4 of the ground wire reactor is a function of reducing noise generated in the ground wire, and is a function by the connecting portion 13 of the grounding lead wire 17 and the core 6 for three phases. This joint part 13 is a shared part of the core part of each phase. Thereby, the integral core 6 used for the reactor for three phases is comprised.

  The three-phase AC motor 5 is rotationally driven by AC power supplied from a power conversion device including the inverter device 1 and the reactor 100. The rotational force of the three-phase AC motor 5 is transmitted to the sheave 50 of the elevator hoist and rotates the sheave 50. A main rope 52 is wound around the sheave 50 and the turning pulley 51. The main rope 52 suspends the car 53 and the counterweight 54 in a hoistway (not shown). When the main rope 52 is driven by the rotation of the sheave 50, the car 53 moves up and down in a hoistway (not shown). As the three-phase AC motor 5, for example, a permanent magnet synchronous motor is applied.

  Hereinafter, the configuration of the reactor will be described.

  2 and 3 are a front view and a plan view, respectively, showing the core of the reactor of the present embodiment.

  As shown in FIG. 2, the core 6 includes window portions 7, 8, and 9 at the center, and has loop portions 10, 11, and 12 for three phases in which a closed magnetic circuit is formed. As shown in FIG. 3, the loop portions 10, 11, and 12 are arranged in a substantially T shape on the upper surface side (lower surface side) of the core 6. That is, the loop portions 10 and 12 are arranged along the virtual straight line AA ′ in FIG. 3, and the loop portion 11 passes through the intermediate portion between the loop portions 10 and 12 and is orthogonal to the virtual straight line AA ′. 'Arranged along. That is, the two loop portions 10 and 12 are arranged on the first virtual plane that is the vertical cross section of the virtual straight line AA ′, and the first loop is perpendicular to the first virtual plane while being the vertical cross section of the virtual straight line BB ′. Another loop portion 11 is arranged on the second virtual plane. The loop portions 10, 11, and 12 are integrally coupled to each other on the adjacent side by a coupling portion 13, thereby configuring an integral core 6 that is used for a three-phase reactor.

  The loop portions 10, 11, 12 and the coupling portion are made of a silicon steel plate, a laminate of amorphous magnetic ribbons, or a bulk magnetic material.

The three-phase loop portions 10, 11, and 12 have substantially the same shape and substantially the same dimensions, and the loop portions 10 and 12 are arranged so that the directions of the widths w ₁₀ and w ₁₂ are aligned. , 12 in the direction of the thickness t _{11 in} the direction of the widths w ₁₀ , w ₁₂ .

Since the core 6 has the loop portions 10, 11, and 12 arranged so that the width (w ₁₀ , w ₁₁ , w ₁₂ ) directions extend in different directions from the coupling portion 13, each of the loop portions 10. , 11, 12 are adjacent to the coupling portion 13, and the window portions 7, 8, 9 are adjacent to each other. In other words, each side of the three rectangular frame parts constituting each of the loop parts 10, 11, 12 is coupled by the coupling part 13.

  4 and 5 are a plan view and a perspective view, respectively, of the reactor of the present embodiment. The reactor 100 is configured using the core 6 shown in FIGS. Therefore, the core 6 shown in FIG. 4 corresponds to the core 6 shown in FIG.

  Reactor 100 includes a core 6, a three-phase conductor wound around a loop portion of core 6, that is, a U-phase conductor 14, a V-phase conductor 15, and a W-phase conductor 16, and a grounding conductor wound around a joint of core 6 And a ground line 17.

  As shown in FIGS. 4 and 5, the U-phase conducting wire 14 is wound through the window portion 7 in the loop portion 10. Terminals U1 and U2 of U-phase conducting wire 14 are respectively connected to a U-phase output terminal of inverter device 1 and a U-phase terminal of a winding of three-phase AC motor 5 (see FIG. 1). V-phase conductor 15 is wound through window portion 8 in loop portion 11. Terminals V1 and V2 of the V-phase conductor 15 are respectively connected to the V-phase output terminal of the inverter device 1 and the V-phase terminal of the winding of the three-phase AC motor 5 (see FIG. 1). W-phase conducting wire 16 is wound through window portion 9 in loop portion 11. Terminals W1 and W2 of W-phase conducting wire 16 are respectively connected to a W-phase output terminal of inverter device 1 and a W-phase terminal of a winding of three-phase AC motor 5 (see FIG. 1).

  In the present embodiment, each of the conducting wires 14, 15, 16 is wound around a portion of each loop portion 10, 11, 12 that faces the coupling portion 13. The number of windings of each of the conductive wires 14, 15, 16 is appropriately set according to the desired performance of the reactor.

  As shown in FIG. 5, the ground wire 17 is wound through all of the adjacent windows 7, 8, 9 in the coupling portion 13 of each loop 10, 11, 12. Terminals E1 and E2 of the ground wire 17 are connected to the ground potential part of the inverter device 1 and the ground potential part of the three-phase AC motor 5, respectively (see FIG. 1).

  Reactor 100 has normal mode reactor function 2 shown in FIG. 1 by the winding of U-phase conducting wire 14, the winding of V-phase conducting wire 15, and the winding of W-phase conducting wire 16 as described above. Moreover, the reactor 100 has the common mode reactor function 3 shown in FIG. 1 by these windings and the loop portions 10, 11, and 12 that are magnetically coupled by the coupling portion 13. Further, the reactor 100 has the function 4 of the ground wire reactor shown in FIG. 1 by the winding of the ground wire 17 and the coupling portion 13.

  As described above, in the reactor 100 according to the present embodiment, the inductance of each phase can be easily equalized by providing the loop portion serving as a magnetic path for each AC phase in the integrated core.

  FIG. 6 shows the magnetic path of each phase when a gap is provided in the loop portion of the core of the above embodiment. In FIG. 6, the front views of the loop portions are shown side by side so that the magnetic paths can be easily compared, and only one turn of the conductive wire is shown. In addition, “x” and “•” added to the conductor indicate the direction of current. Moreover, a dotted line shows a magnetic path and the arrow attached to a dotted line shows the direction of magnetic flux.

  In order to prevent magnetic saturation of the core, gaps g1, g2, and g3 having substantially the same gap length are provided in the loop portions 10, 11, and 12 of the core 6 shown in FIG. In the loop portion 10, a gap g1 is provided in a portion excluding a portion adjacent to the coupling portion 13, that is, a portion facing the coupling portion 13 in FIG. 6, and a magnetic path 18 is formed as indicated by a dotted line in the drawing. In the loop portion 11, a gap g <b> 2 is provided in a portion excluding a portion adjacent to the coupling portion 13, in FIG. 6, a portion facing the coupling portion 13, and a magnetic path 19 is formed as indicated by a dotted line in the drawing. In the loop portion 12, a gap g3 is provided in a portion excluding a portion adjacent to the coupling portion 13, that is, in a portion facing the coupling portion 13 in FIG. 6, and a magnetic path 20 is formed as indicated by a dotted line in the drawing.

  As described above, each of the magnetic paths 18, 19, and 20 has one gap, and there is no gap that is shared by adjacent phases. Further, the gap lengths of the gaps g1, g2, and g3 are equal. Thereby, the inductance of each phase is equalized without causing imbalance.

  Further, by using the reactor of the embodiment shown in FIGS. 2 to 6 for the power converter, the noise generated by the power converter and the motor drive system including the power converter and the three-phase AC motor is effectively reduced. be able to. Further, since the shield facility can be reduced, the power conversion device and the motor drive system can be reduced in size. Thereby, since the installation space can be reduced in the power converter for an elevator and the electric motor drive system as shown in FIG. 1, the elevator can be saved in space.

  FIG. 7 shows a reactor core which is a modification of the above embodiment. As in the embodiment shown in FIG. 3, the core 6 of this modification includes three-phase loop portions 10, 11, and 12 each having a window portion 7, 8, and 9 at the center and forming a closed magnetic circuit. Have. Further, the core 6 of this modification is different from the embodiment shown in FIG. 3, and each loop portion 10, 11, 12 is substantially Y on the upper surface side (lower surface side) of the core 6 as shown in FIG. 7. Arranged in a letter shape. That is, the loop portions 10, 11, and 12 extend radially from the coupling portion 13 on the upper surface side (lower surface side) of the core 6. The directions in which adjacent loops extend form an angle of approximately 120 degrees, and the three-phase loop portions 10, 11, and 12 are arranged in rotational symmetry. Although not shown, other configurations such as the conductive wire and its winding are the same as in the embodiment of FIG.

  FIG. 8 shows a reactor core which is another modification of the above embodiment. As in the embodiment shown in FIG. 3, the core 6 of this modification includes three-phase loop portions 10, 11, and 12 each having a window portion 7, 8, and 9 at the center and forming a closed magnetic circuit. Have. Further, unlike the embodiment shown in FIG. 3, the core 6 of this modification further has a loop portion 22 for grounding wire that is provided with a window portion 21 at the center portion and forms a closed magnetic circuit. A conductor for grounding wire is wound around the loop portion 22 through the window portion 21. The loop portions 10, 11, 12, and 22 are arranged in a substantially cross shape on the upper surface side (lower surface side) of the core 6, as shown in FIG. Although not shown, other configurations such as the three-phase conductors and their windings are the same as in the embodiment of FIG.

  Similarly, with these modifications, the inductance of each phase is easily equalized. Furthermore, by using the reactor of these modified examples for a power converter, noise generated by the power converter and the motor drive system can be effectively reduced, and the power converter and the motor drive system can be downsized. be able to. Furthermore, since the installation space can be reduced in the power converter for an elevator and the motor drive system, the elevator can be saved in space.

  The present invention is not limited to the above-described embodiments and modifications, and includes various other modifications. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. In addition, it is possible to add, delete, and replace other configurations for a part of the configurations of the embodiment and the modified example.

  For example, in the loop portion of the core, the position where the conductive wire is wound and the position where the gap is provided may be changed as appropriate.

DESCRIPTION OF SYMBOLS 1 Inverter apparatus 5 Three-phase alternating current motor 6 Core 7, 8, 9 Window part 10, 11, 12 Loop part 13 Connection part 14 U-phase conductor 15 V-phase conductor 16 W-phase conductor 18, 19, 20 Magnetic path 21 Window part 22 Loop 50 Sheave 51 Turning pulley 52 Main rope 53 Car 54 Balance weight 100 Reactor

Claims (10)

In a reactor comprising a magnetic core part and a conducting wire wound around the core part,
Each of the magnetic core parts has a window part in the center part, and has a loop part for AC three-phases constituting a closed magnetic circuit,
The three-phase loop portion is integrated via a coupling portion and arranged to extend in different directions with respect to the coupling portion,
The reactor is characterized in that the conductive wire is wound around each loop portion through the window portion.   2. The reactor according to claim 1, wherein a conductor for a grounding wire is wound around the coupling portion through the window portion in each of the loop portions for the three phases.   The reactor according to claim 1, wherein a gap is provided in the closed magnetic path.   The reactor according to claim 3, wherein the gap portion is provided at a position facing the coupling portion in the loop portion for the three phases.   5. The reactor according to claim 1, wherein the three-phase loop portion is arranged in a substantially T shape on the upper surface side of the magnetic core portion. 6.   5. The reactor according to claim 1, wherein the three-phase loop portion is arranged in a substantially Y shape on an upper surface side of the magnetic core portion.   2. The reactor according to claim 1, wherein the magnetic core portion further includes a ground wire loop portion around which a ground wire is wound.   8. The reactor according to claim 7, wherein the three-phase loop portion and the ground wire loop portion are arranged in a substantially cross shape on the upper surface side of the magnetic core portion. An inverter device that supplies three-phase AC power to a three-phase AC motor, and a reactor connected between the three-phase AC output of the inverter device and the three-phase AC terminal of the three-phase AC motor. In
The said reactor is a reactor as described in any one of Claims 1 thru | or 8, The power converter device characterized by the above-mentioned.   The power converter according to claim 9, wherein the three-phase AC motor drives an elevator hoist.

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