JP2019125647A - Zero-phase current suppression reactor and winding - Google Patents

Abstract

To provide a zero-phase current suppression reactor and winding, capable of improving a suppression effect of zero-phase current and also capable of reducing the risk of interference with current that have components other than zero-phase current.SOLUTION: In a zero-phase current suppression reactor 1 of an embodiment, each wiring conductor 2 has a winding-start end and a winding-finish end which are in the same position in a circumferential direction, and the winding-start ends are in three equal positions in the circumferential direction. The winding conductors are wound such that sites in parallel with other winding conductors 2 therein have lengths equal to each other.SELECTED DRAWING: Figure 1

Description

  Embodiments of the present invention relate to a zero-phase current suppression reactor that suppresses zero-phase current, and a winding.

  In recent years, so-called power electronic devices have been adopted in various fields also in power systems, and various problems have emerged along with it. For example, power electronics devices such as inverters may cause harmonic currents to flow out along with their operation, and zero-phase currents included in each harmonic component, ie, components having equal magnitude and in-phase between three phases If it leaks into the circuit, it does not cancel each other, which may cause induction and radio interference around the circuit. Therefore, in order to suppress the zero-phase current flowing out of the power electronics device, a zero-phase current suppression reactor may be adopted (see, for example, Patent Document 1).

JP, 2011-103455, A

  Such a zero-phase current suppression reactor has a configuration in which three winding conductors respectively connected to three-phase electric paths are wound, and the respective winding conductors are magnetically tightly coupled, While it is necessary to have a suppression effect that makes it difficult for the zero-phase current to flow in the electrical path, it is desirable not to interfere with the currents of components other than the zero-phase current.

  However, in addition to the problem that the suppression effect of the zero-phase current in the electric path is reduced if the magnetic coupling of the winding conductors of each phase is uneven, the current of components other than the zero-phase current is impeded. It can be

  Therefore, a zero-phase current suppression reactor and a winding can be provided which can improve the suppression effect of the zero-phase current and reduce the possibility of interference with currents of components other than the zero-phase current.

  The zero-phase current suppression reactor according to the embodiment is obtained by axially arranging and winding three winding conductors respectively connected to a three-phase electric path, and each winding conductor has a winding start end and a winding end Are at the same position in the circumferential direction and the winding start ends are at positions equally spaced in the circumferential direction so that the lengths of the portions parallel to other winding conductors are equal to each other It is wound.

Diagram schematically showing the configuration and winding mode of a zero-phase current suppression reactor The figure which shows typically the winding aspect of a winding conductor The figure which shows typically the winding aspect of a winding conductor with an iron core Diagram for explaining the electrical characteristics of the zero-phase current suppression reactor

  Hereinafter, embodiments will be described with reference to the drawings.

  FIG. 1 shows the configuration and winding mode of the zero-phase current suppression reactor 1 according to the present embodiment, and schematically shows a state in which the zero-phase current suppression reactor 1 formed in a cylindrical shape is expanded in the circumferential direction It shows. In the case of FIG. 1, the right end side indicates the 0 degree position in the circumferential direction, and the left end side indicates the 360 degree position, that is, the 0 degree position after one rotation. In addition, in FIG. 1, each winding conductor 2 is attached | subjected to a hatching which is different, respectively, and is shown in it easily in order to demonstrate.

  The zero-phase current suppression reactor 1 is configured by winding in a state in which three winding conductors 2 corresponding to three phases of U phase, V phase and W phase are arranged in parallel. Each of the winding conductors 2 is, for example, one formed by bundling a plurality of litz wires into a flat shape, or one using one or a plurality of flat conductors, so as to be adjacent in the longitudinal direction in cross section It is wound together in the state arrange | positioned at. Moreover, the winding conductor 2 is insulated by winding an insulating tape etc. on the surface.

  Hereinafter, when describing the winding conductor 2 corresponding to each phase, "u", "v", or "w" is added to the code | symbol, and is demonstrated. Moreover, the direction in which each winding conductor 2 adjoins is hereafter called axial direction.

  In the case of the zero-phase current suppression reactor 1, the W-phase winding conductor 2w starts winding at 0 degrees in the circumferential direction (0T), and after being wound a plurality of times, turns 360 degrees at the end of winding (7T It is wound to become). That is, in the case of the W-phase winding conductor 2w, the position of 0 degrees is the winding start end, and the position of 360 degrees is the winding end.

  In addition, the V-phase winding conductor 2v is wound so that the position of 120 degrees in the circumferential direction is the winding start end, and after being wound multiple times, the position of 120 degrees is the winding end. The U-phase winding conductor 2 u is wound so that the position of 240 degrees in the circumferential direction is the winding start end, and after being wound multiple times, the position of 240 degrees is the winding end. In FIG. 1, the winding start end of U-phase winding conductor 2 u is “U”, the winding end is “Ou”, the winding start end of V-phase winding conductor 2 u is “V”, and the winding end is “Ov The winding start end of the W-phase winding conductor 2 u is indicated as “W”, and the winding end is indicated as “Ow”.

  That is, each winding conductor 2 is wound such that the winding start end and the winding end are at the same position in the circumferential direction, and the winding start ends are equally spaced in the circumferential direction, ie, in the circumferential direction It is wound so as to be at a position shifted by 120 degrees. Although the winding start end of the W-phase winding conductor 2w is shown as a position of 0 degrees for convenience in FIG. 1, the winding start position of the U-phase winding conductor 2u or the winding start of the V-phase winding conductor 2v An arbitrary position can be set to 0 degrees, such as setting the position to 0 degrees. Moreover, the winding number of each winding conductor 2 is an example, and is not limited to this.

  As shown in FIG. 2, the zero-phase current suppression reactor 1 having such a configuration is wound around the outer periphery of the leg 3 a of the two-legged iron core 3. At this time, in the zero-phase current suppression reactor 1, the winding start end of any of the winding conductors 2 is located on an imaginary line (CL) passing through the center of the leg 3a and outside the leg 3a. It is arranged. In the case of FIG. 2, the zero-phase current suppression reactor 1 is wound such that the winding start end of the U-phase winding conductor 2 u is located on the virtual line (CL). In this case, it is possible to provide a discontinuous portion such as a so-called gap in the ring-shaped biped iron core 3.

  Also, as shown in FIG. 3, when the winding conductor 2 is wound around the two legs 3a of the two-leg core 3, for example, the winding start end of the U-phase winding conductor 2u is of the leg 3a. It may be arranged to be located on an imaginary line (CL) passing through the center and outside the legs 3a. At this time, the winding conductors 2 of the legs 3a may be electrically connected in series or in parallel. In place of the U-phase winding conductor 2, the V-phase winding conductor 2v or the W-phase winding conductor 2w may be wound so as to be positioned on the virtual wire (CL).

  Next, the operation of the above configuration will be described.

  As described above, while the zero-phase current suppression reactor 1 needs to have a suppression effect that makes it difficult for the zero-phase current to flow in the electrical path, it is desirable that it does not interfere with the current of components other than the zero-phase current However, if the magnetic coupling of the winding conductor 2 of each phase is uneven, the suppression effect of the zero phase current in the electric path may be reduced, or the current of components other than the zero phase current may be disturbed.

  Therefore, in the present embodiment, by making the magnetic coupling of each winding conductor 2 uniform, the suppression effect of the zero-phase current can be improved, and there is a possibility that the current of components other than the zero-phase current will be disturbed. It is possible to reduce the

  FIG. 4 shows an equivalent circuit of the zero-phase current suppression reactor 1. Here, the zero-phase current (i0) is in-phase for every arbitrary frequency included in the current (iu, iv, iw) flowing in the winding conductor 2 of each phase as shown by the following equation (1): And it is the sum of the components of the same size.

In addition, the specifications required for the zero-phase current suppression reactor 1 include the following two.
(1) Minimizing the zero phase current (i0).
(2) Minimize the inductance for currents other than the zero phase component.

  In this case, if the inductances (Lu, Lv, Lw) of the respective phases are equalized, more specifically speaking, the mutual inductance between the U phase and the V phase represented by the following formulas (2) to (4) The above specifications can be satisfied by equalizing (Muv), the mutual inductance (Mvw) between the V phase and the W phase, and the mutual inductance (Mwu) between the W phase and the U phase.

  And, in order to satisfy the above-mentioned equations (2) to (4), as shown in FIG. 1, each winding conductor 2 is placed at the same position in the circumferential direction at the winding start end and the winding end The winding start end may be wound so as to be at a position equally distributed in the circumferential direction. More specifically, U-phase winding conductor 2u is geometrically 6 turns, 1/3 turns, 1/3 turns, 6 + 2/3 turns, as is apparent from FIG. 1 with V-phase winding conductors 2v. In addition to being in parallel, the W-phase winding conductor 2w is also geometrically in parallel by 6 + 2/3 turns.

  Similarly, winding conductor 2v of V phase is geometrically in parallel with winding conductor 2u of U phase by 6 + 2/3 turns, and also winding conductor 2w of W phase is geometrically 6 + 2 It is paralleled by / 3 turns. W-phase winding conductor 2w is geometrically 6 + 2/3 turns in parallel with U-phase winding conductor 2u, and V-phase winding conductor 2w is geometrically 6 + 2 / It is paralleled by 3 turns.

  That is, in each winding conductor 2, the lengths of the portions in parallel with the other two-phase winding conductors 2 are equal to each other by 6 + 2/3 turns. By equalizing the geometrical arrangement of the winding conductors 2 in this manner, the magnetic coupling between the winding conductors 2 is made uniform. Then, if the magnetic coupling between the winding conductors 2 is made uniform, the mutual inductances (Muv, Mvw, Mwu) become equal, and the inductances (Lu, Lv, Lw) of each phase become equal. As a result, the zero-phase current suppression reactor 1 can meet the required specifications (1) and (2) described above.

  According to the embodiment described above, the following effects can be obtained.

  In the zero-phase current suppression reactor 1, each winding conductor 2 is at a position where the winding start end and the winding end are at the same position in the circumferential direction and the winding start ends are equally spaced in the circumferential direction It is wound such that the lengths of the portions in parallel with the other winding conductors 2 are equal to one another.

  As a result, the winding conductors 2 of each phase have the same geometrical arrangement with respect to the other winding conductors 2 and the mutual inductances become equal, so that the magnetic coupling between the winding conductors 2 is equalized. Ru. As a result, the inductances (Lu, Lv, Lw) of the respective phases become equal, and the specifications required for the zero-phase current suppression reactor 1 are satisfied, so that the suppression effect of the zero-phase current can be improved. It is possible to reduce the possibility of interfering with the current of components other than the current.

  Further, according to the above-described winding structure, the axial length of the zero-phase current suppression reactor 1, that is, the height dimension is minimized when equalizing the geometrical arrangement to the other winding conductors 2 respectively. It is possible to realize in the state where it is carried out and to achieve miniaturization.

  The winding conductor 2 can also be wound around a leg 3a of an iron core such as a two-leg iron core 3. Thereby, the reluctance can be reduced, and the magnetic flux can be increased to increase the inductance. Also, by providing a gap in the iron core, magnetic saturation can be alleviated and a constant inductance can be obtained. Further, by connecting the winding conductors 2 of the respective legs 3a electrically in series or in parallel, it is possible to meet various required specifications.

  In addition, the winding start end and the winding end of the winding conductor 2 are at the same position in the circumferential direction and the winding start end is at a position where the circumferential direction is equally distributed. Even in the case of windings wound so that the lengths of the parts in parallel are equal to each other, the suppression effect of the zero-phase current is improved as in the zero-phase current suppression reactor 1 of the embodiment. The same effects can be obtained, for example, the possibility of interference with the current of components other than the zero-phase current can be reduced, and downsizing can be achieved.

  While certain embodiments of the present invention have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and the gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

  In the drawings, 1 indicates a zero-phase current suppression reactor and a winding, 2 indicates a winding conductor, 3 indicates a two-legged iron core (iron core), 3a indicates a leg, and CL indicates a virtual wire.

Claims (5)

A zero-phase current suppression reactor in which three winding conductors respectively connected to a three-phase electric path are arranged in an axial direction and wound,
In each of the winding conductors, the winding start end and the winding end are at the same position in the circumferential direction and the winding start ends are at positions where the circumferential direction is equally divided, and the other winding conductors A zero-phase current suppression reactor, which is wound so that the lengths of the parts in parallel with each other are equal.   The zero-phase current suppression reactor according to claim 1, wherein the winding conductor is wound around an outer periphery of an iron core. The winding conductor is wound around each leg of a two-legged iron core,
The zero-phase current suppression reactor according to claim 1 or 2, wherein the winding conductor of each leg is electrically connected in series or in parallel. The winding conductor is wound around each leg of a two-legged iron core,
One of the winding conductors wound on each leg is located on an imaginary line on the imaginary line through the centers of the two legs, with the winding start end and the winding end end outside the respective legs The zero-phase current suppression reactor according to any one of claims 1 to 3, which is arranged to A winding formed by axially arranging and winding three winding conductors respectively connected to a three-phase electric path,
In each of the winding conductors, the winding start end and the winding end are at the same position in the circumferential direction and the winding start ends are at positions where the circumferential direction is equally divided, and the other winding conductors A winding characterized in that the lengths of the parts in parallel with each other are equal to each other.

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