JP6576740B2 - Coil bobbin, coil and transformer provided with the coil - Google Patents

Description

  The present invention relates to a coil bobbin in which windings are aligned and wound, a coil in which a winding is wound around the coil bobbin, and a transformer including the coil.

  Conventionally, as a coil bobbin used for a coil for a transformer, it is composed of a frame having a rectangular ring shape, and a winding is wound around a side surface on the outer peripheral side of the frame (hereinafter referred to as “outer peripheral side surface”). A coil bobbin in which a concave groove is formed is known. For example, in FIG. 6 of Patent Document 1, as a coil bobbin for a primary coil, a cross-sectional shape in which both inner wall surfaces are inclined so that the bottom surface side is tapered on the outer peripheral side surface of a frame body having a rectangular ring shape. A coil bobbin provided with a recessed groove is described.

  The coil bobbin shown in the figure has a circular inner core side surface (hereinafter referred to as “inner peripheral side surface”) in order to mount a cylindrical iron core on the long side portion of the frame. It is formed in an arc shape. Moreover, the notch for drawing out the both ends of the primary winding wound by the groove of the coil bobbin to the outside of a coil bobbin is provided in the short side part of the frame.

  In the coil bobbin described in FIG. 6 of Patent Document 1, one end of the primary winding is pulled out from the notch to the outside of the coil bobbin, and the other end from the one end in the width direction of the bottom surface of the groove (the end with the notch) is the other. After winding the windings without any gaps (aligned windings) and then turning back and winding them without any gaps from the other end to the upper side of the primary windings that have been aligned and wound, the primary winding is repeated a predetermined number of times. A primary coil having a predetermined number of turns is manufactured by drawing the other end of the winding from the notch to the outside of the coil bobbin.

  Then, both end portions of the primary winding drawn out from the notch of the coil bobbin are respectively connected to a pair of primary bushings (bushings to which the primary voltage of the transformer is applied) provided outside the coil bobbin.

JP-A-8-51034

  For example, in a 6600 [V] / (210-105 [V] transformer for power distribution, a high voltage of 6000 [V] or more is applied to the primary coil. It is necessary to insulate the windings in consideration of the potential difference between adjacent windings, especially since a high voltage of 6000 [V] or more is applied between both ends of the primary winding drawn from the coil bobbin. It is necessary to sufficiently consider the potential difference between the stacked windings on the end side to which a high voltage is applied even in the primary winding.

For example, when a high voltage of 6600 [V] is applied between both ends of the primary winding to be aligned and wound in the groove of the coil bobbin, the position where the winding of the primary winding into the groove is started (the high voltage is applied). that the voltage v ₁ of the winding start position) of the first layer of the winding becomes 6000 [V] or more high pressure. First voltage v _a of the distal end portion of the second layer of windings stacked on the upper side of the regular winding has been first layer of windings as reciprocating in the width direction of the groove, T the number whole set of the primary winding [Turn] When the number of turns from the first layer winding start position to the second layer winding end position is ΔT [turn], v _a = (1−ΔT / T) × total voltage (6600 [V]) It becomes.

The potential difference between the windings adjacent to each other vertically in the winding start position of the primary winding becomes the induced voltage difference _{Δv = v 1 -v a = (} ΔT / T) × total voltage. When the number of turns of the winding wound in a row so as to make one reciprocation in the width direction of the concave groove is large, that is, when the size in the width direction of the groove is large, the number of turns for one reciprocation of the winding corresponds to the total number of turns. The ratio (ΔT / T) increases, and the induced voltage Δv during that time increases.

  If insulation between the layers of the laminated primary windings is not sufficient, if a dielectric breakdown occurs at the end of the winding to which a high voltage of 6000 [V] or more is applied, not only will the transformer fail, but a major accident may occur. There is a risk of being connected. Therefore, usually, countermeasures such as interposing an insulating sheet or the like between layers of the laminated primary windings are taken.

  However, if an insulating sheet or the like is interposed between the layers of the primary windings to be laminated, it is necessary to increase the depth of the concave grooves for aligning and winding the primary windings, and the coil bobbin becomes large. . In addition to the winding, a part such as an insulating sheet is required, which increases the cost of the coil.

  The present invention has been made in view of the above problems, and a coil bobbin capable of suppressing the withstand voltage between layers by reducing the number of turns per layer of the laminated windings, and winding the winding around the coil bobbin It is an object of the present invention to provide a coil and a transformer including the coil.

  A coil bobbin according to a first aspect of the present invention is a coil bobbin including a bobbin main body and a concave groove formed on an outer peripheral side surface of the bobbin main body, and a coil is manufactured by winding the windings in layers in the concave groove. The coil bobbin is characterized in that at least one dividing wall for dividing the concave groove in the width direction is formed on the bottom surface of the groove.

  As a preferred embodiment of the coil bobbin, a guide groove for guiding the winding position of the winding may be formed on the bottom surface of the concave groove.

  As a preferred embodiment of the above-described coil bobbin, the cross-sectional shape of the groove is preferably a rectangular or an isosceles trapezoid whose upper base is longer than the lower base and whose inner angles at both ends of the lower base are 120 °.

  Further, as a preferred embodiment of the above-described coil bobbin, the winding has a main winding constituting the main part of the number of turns and a winding adjusting coil constituting the adjustment part of the number of turns. A first groove having a predetermined cross-sectional shape, and a second groove having a predetermined cross-sectional shape extending to the bottom surface side or the opening surface side of the first groove. The winding may be arranged such that the main winding is aligned and wound in layers in the first concave groove, and the winding number adjusting winding is aligned and wound in layers in the second concave groove.

  As a preferred embodiment of the above-described coil bobbin, the second groove is formed in the bottom surface of the first groove, and the second groove is formed on the bottom surface of the second groove. One dividing wall is formed vertically so as to divide the first groove into the first space and the second space in the width direction, and on the side wall facing the first space of the second groove. Is provided with first winding lead portions for pulling out both end portions of the winding number adjusting winding from the bobbin body, and both end portions of the main winding are respectively disposed on both side walls of the first concave groove. A second winding lead portion for pulling out from the main body is provided, and the winding is arranged after the winding number adjusting winding is aligned and wound in layers in the first space of the second concave groove, and then the main winding. Is one of the windings for adjusting the number of turns that is wound in a layered manner over the first space and the second space of the first groove and is drawn from the first winding lead portion. When good and one end of the second winding primary winding drawn out from the lead portion are connected in series through the tap terminal outside of the bobbin main body.

  As a preferred embodiment of the coil bobbin, the winding adjustment winding has a plurality of small windings connected in series with each other and having a smaller number of turns than the main winding, and the first winding lead portion is And a plurality of winding lead portions provided corresponding to each of the plurality of small windings, the plurality of small windings being wound in layers in the second concave groove, It is preferable that both end portions of the first and second winding portions are drawn out from corresponding winding lead portions of the first winding lead portion and connected in series via a tap terminal outside the bobbin main body.

  As a preferred embodiment of the coil bobbin, the guide groove is formed on the bottom surface of the first concave groove, and the first guide groove for guiding the winding position of the main winding and the bottom surface of the second concave groove And a second guide groove for guiding the winding position of the winding number adjusting winding.

  As a preferred embodiment of the coil bobbin, the second concave groove is continuously provided on the upper part of the opening surface of the first concave groove, and the bottom surface of the first concave groove is provided with the first concave groove. One dividing wall is formed vertically so as to divide the first groove and the second groove into the first space and the second space in the width direction, and the main winding has the first groove. A first split winding wound in alignment in the first space of the groove and a second split winding wound in alignment in the second space of the first concave groove, A first small winding wound in alignment in the first space of the second groove, and a second small winding wound in alignment in the second space of the second groove, On the side wall facing the first space of the groove, a first winding lead portion for pulling out both end portions of the first split winding from the bobbin main body, and both end portions of the first small winding on the bobbin main body To pull out from A second winding lead portion is provided, and a third winding lead for pulling out both end portions of the second split winding from the bobbin main body on the side wall facing the second space of the second concave groove And a fourth winding lead portion for pulling out both end portions of the second small winding from the bobbin main body, and the first split winding of the main winding is the first split winding. After being aligned and wound in layers in the first space of the concave groove, the first small winding of the winding number adjusting winding is aligned and wound in layers on the upper layer of the first divided winding, After the second divided winding is aligned and wound in layers in the second space of the first concave groove, the second small winding of the winding adjustment winding is layered on the upper layer of the second divided winding. One end of the first divided winding that is alignedly wound and drawn from the first winding lead portion, both ends of the first small winding drawn from the second winding lead portion, and the third winding Pull from drawer Both ends of the second Komaki lines may be connected in series through the tap terminal outside of the bobbin main body drawn from one end and the fourth winding draw-out portion of the first split windings.

  As a preferred embodiment of the above-described coil bobbin, the first and second small windings are aligned and wound in one layer, and the end of the winding start side or the winding end side passes through the top layer and passes through the second layer. It is good to be drawn out of the bobbin body from the winding lead-out part.

  A coil of the second invention is a coil used for a stationary induction device, and is characterized by being formed by winding windings in a layered manner in the concave groove of the coil bobbin of the first invention. .

  Moreover, the transformer of 3rd invention is a transformer provided with the coil of 2nd invention as a primary coil.

  According to the coil bobbin and the like according to the present invention, the space of the concave groove formed on the outer peripheral side surface of the bobbin body is divided in the width direction of the concave groove by the dividing wall. The number of turns of each layer of the winding laminated in each space where the groove is divided can be reduced as compared with the case where the space of the groove is not divided. Thereby, the withstand voltage between the layers of the windings aligned and wound in the concave groove can be suppressed, and the parts and cost for insulation measures can be reduced.

The perspective view which shows the structure of the principal part of the transformer which concerns on 1st Embodiment. The figure which shows the circuit structure of the transformer which concerns on 1st Embodiment. The figure which looked at the 1st coil bobbin (coil bobbin concerning the present invention) for producing the primary coil of the transformer concerning a 1st embodiment from the front The first coil bobbin is viewed from the right side XX sectional view in FIG. 4 of the first coil bobbin. A front view of the second coil bobbin for manufacturing the secondary coil of the transformer The second coil bobbin is viewed from the right side Sectional view along line YY in FIG. 6 of the second coil bobbin The figure which shows the guide groove for guiding the alignment winding of the coil | winding for winding number adjustment formed in the bottom face of the 2nd recessed groove of the said 1st coil bobbin. The figure for demonstrating the winding method of the main winding to the ditch | groove of the same 1st coil bobbin, and the winding for winding number adjustment The figure for demonstrating the inclination-angle with respect to the bottom face of the inner wall face of the 1st ditch | groove of the 1st coil bobbin. The figure for demonstrating the manufacturing method of the coil part which has arrange | positioned the secondary coil concentrically outside the primary coil of the transformer The figure for demonstrating the effect by having provided the dividing wall in the 2nd groove of the same 1st coil bobbin The perspective view which shows the structure of the principal part of the transformer which concerns on 2nd Embodiment. The figure which looked at the 1st coil bobbin concerning a 2nd embodiment from the front The figure which looked at the 1st coil bobbin concerning a 2nd embodiment from the right side ZZ line sectional view in Drawing 16 of the 1st coil bobbin concerning a 2nd embodiment. The figure which shows the circuit structure of the transformer which concerns on 2nd Embodiment. The figure for demonstrating the winding method of the main winding to the concave groove of the 1st coil bobbin which concerns on 2nd Embodiment, and the winding for winding number adjustment The figure which shows the modification of the dividing wall provided in the 1st coil bobbin

  Embodiments of a coil bobbin according to the present invention will be described below with reference to the drawings.

  In the following description, a coil bobbin used for the primary coil and the secondary coil of the transformer will be described. In the transformer according to the present embodiment, the secondary coil in which the secondary winding is aligned and wound is arranged concentrically outside the primary coil in which the primary winding is aligned and the cylindrical shape is formed outside the legs of both coils. It has a structure in which the iron core is arranged. The coil bobbin according to the present invention is particularly used for producing a primary coil of a transformer.

  FIG. 1 is a perspective view showing a configuration of a main part of a transformer according to a first embodiment of the present invention. FIG. 2 is a diagram illustrating a circuit configuration of the transformer according to the first embodiment.

  A transformer A1 shown in FIG. 1 includes a coil part B having a rectangular ring shape in which a second coil 2 is arranged concentrically outside a first coil 1 (not visible in FIG. 1; see FIG. 12). And a cylindrical iron core C attached to one of the two long side portions (leg portions) of the coil portion B. As will be described later, the first coil 1 and the second coil 2 are manufactured using a coil bobbin 101 (see FIGS. 3 and 4) and a coil bobbin 201 (see FIGS. 6 and 7), respectively.

  In the transformer A1, a high voltage of 6000 [V] or more is applied to the first coil 1 from the power system, and a specified low voltage (for example, 100 [V] or 200 [V] is supplied to the consumer from the second coil 2. ] Is an example applied to a distribution transformer.

  In the transformer A1, a high voltage is input to the first coil 1 and a low voltage is output from the second coil 2. Therefore, the first coil 1 of the transformer A1 is a primary coil, and the second coil 2 is a second coil. The next coil. The first coil 1 of the transformer A1 is a high voltage coil, and the second coil 2 is a low voltage coil.

  The transformer A1 corresponds to a portion indicated by a dotted line in the circuit configuration of the transformer A1 shown in FIG. In the following description, the first coil 1 is referred to as “primary coil 1” or “high voltage coil 1”, and the second coil 2 is referred to as “secondary coil 2” or “low voltage coil 2”.

The primary coil 1 of a transformer A1, as shown in FIG. 2, the main winding 1021 which constitutes the main part of the number of turns n ₁ of the primary winding 102, winding adjuster of turns n ₁ of the primary winding 102 ( having a number of turns adjusting winding 1022 which constitutes a part) for adjusting the number of turns of turns n _1.

Transformer A1 are the step-down transformer, the number of turns n ₂ of the secondary coil (low voltage coil) secondary winding 202, from the number of turns n ₁ of the primary coil (high voltage coil) 1 of the primary winding 102 There are few. Since the primary current flowing through the primary coil (high voltage coil) 1 is smaller than the secondary current flowing through the secondary coil (low voltage coil) 2, the wire diameter of the primary winding 102 is larger than the wire diameter of the secondary winding 202. small.

  The winding number adjusting winding 1022 has three small windings 1022a, 1022b, and 1022c. The main winding 1021 has a divided winding 1021a and a divided winding 1021b which are divided into two. As will be described later, the space of the concave groove 1012 (see FIG. 4) for aligning and winding the primary winding 102 of the coil bobbin 101 is divided into two in the width direction. The three small windings 1022a, 1022b, and 1022c of the winding number adjusting winding 1022 are aligned and wound in one space of the concave groove 1012 (hereinafter referred to as “first space”). Part of the side connected to the winding number adjusting winding 1022 is aligned and wound in the first space of the concave groove 1012, and the rest is the other space of the concave groove 1012 (hereinafter referred to as “second space”). Are aligned and wound.

  In the first embodiment, the portion of the groove 1012 of the main winding 1021 that is aligned and wound in the first space and the portion that is aligned and wound in the second space are connected in series outside the coil bobbin 101. Since it is configured, the main winding 1021 is divided into two, one divided winding 1021a is aligned and wound in the first space of the groove 1012, and the other divided winding 1021b is placed in the second space of the groove 1012. It is arranged so that it is aligned.

  In the circuit configuration of the transformer A1, the three small windings 1022a, 1022b, and 1022c are connected in series, and the small winding 1022c of the winding number adjusting winding 1022 and the main winding 1021 are connected in series. The connection points of the small winding 1022a and the small winding 1022b, the small winding 1022b and the small winding 1022c, the small winding 1022c and the main winding 1021, and the open terminals of the small winding 1022a become taps.

  The circuit configuration of the transformer A1 shown in FIG. 2 is required for the bushing disposed in the tank and the tap changer TL built in the tank. The electrical connection is completed.

The tank, a pair of primary bushing BS1 for applying a primary voltage _{v 1 (+), BS1 (} -) and three secondary bushing BS2 for outputting a secondary voltage _{v 2} (+), BS2 _{(-) 2, BS2 (G} ) (. (G) is indicative of a bushing which is grounded) and the primary bushing relay terminal _{Q 1} is disposed. Primary bushing S1 (-) is connected to the primary bushing relay terminal Q _1.

The tap changer TL is provided with four tap terminals P _{1 to} P ₄ and a common terminal P _c connected to any one of the tap terminals by the switching piece TC. The common terminal _Pc of the tap changer TL is connected to the primary bushing BS1 (+). Ends of Komaki line 1022a is connected to the tap terminal P ₁ and the tap terminal _{P 2} respectively, at both ends of Komaki line 1022b is connected to the tap terminal _{P 2} and the tap terminal _{P 3} respectively, opposite ends of Komaki line 1022c are respectively It is connected to the tap terminals _{P 3} and the tap terminal _{P 4.} The other end of the one end of the divided windings 1021a discrete winding wiring 1021b is connected to the tap terminal _{P 4} to the primary bushing connection terminals _{Q 1,} respectively, one end of the other end of split windings 1021a discrete winding wiring 1021b coil bobbin 101 Connected to each other outside.

In FIG. 2, connection points T _{1 to} T ₅ are illustrated in order to indicate connection points between the main winding 1021 and the winding number adjustment winding 1022. Thus, in FIG. 2, to connect the two ends of the small roll line 1022a to each connection point _{T 1} and the connection point _{T 2,} and connecting both ends of the small roll line 1022b to each connection point _{T 2} and the connection point _{T 3,} Komaki connecting the two ends of the line 1022c to the connection point _{T 4} respectively connecting point _{T 3.} Also, connect the two ends of the split windings 1021a to the connecting point _{T 5} respectively connecting points _{T 4,} is connected to one end of the split windings 1021b to the connection point _{T 5.}

  As shown in FIG. 1, both ends of the divided winding 1021a, both ends of the divided winding 1021b, and both ends of the small windings 1022a, 1022b, and 1022c are drawn out from the coil portion B of the transformer A1. Further, as shown in FIG. 12, both end portions of the secondary winding 202 and the intermediate position c are also drawn from the coil portion B of the transformer A1. In FIG. 1, both end portions of the secondary winding 202 drawn from the coil portion B and the portion at the intermediate position c are not visible.

The lead lines L _a1 and L _a2 shown in FIG. 1 are lines drawn from both ends of the small winding 1022a, and the lead lines L _b1 and L _b2 are lines drawn from both ends of the small winding 1022b, The lead lines L _c1 and L _c2 are lines drawn from both ends of the small winding 1022c. The lead lines L _d1 and L _d2 are drawn from both ends of the split winding 1021a of the main winding 1021, and the lead lines L _e1 and L _e2 are drawn from both ends of the split winding 1021b of the main winding 1021. It is a line. Further, the lead lines L _f1 and L _f2 shown in FIG. 12 are lines drawn from both ends of the secondary winding 202, and the lead line L _f3 is a line drawn from the intermediate position c of the secondary winding 202. It is.

When the transformer A1 is housed in the tank, the lead lines L _a1 , L _a2 , L _b1 , L _b2 , L _c1 , led out from the three small windings 1022 a, 1022 b, 1022 c of the winding number adjustment winding 1022, L _c2 is lead lines _{L a1, L a2} is the tap terminals _{P 1} and the tap terminal _{P 2} of the tap changer TL, lead lines _{L b1, L b2} taps of the tap changer TL terminal _{P 2} and the tap terminal _{P 3} The lead lines L _c1 and L _c2 are connected to the tap terminal P ₃ and the tap terminal P ₄ of the tap switch TL, respectively.

Further, one lead wire _{L d1} drawn from a discrete winding wiring 1021a main winding 1021 is connected to the connection point _{T 4} the tap changer TL, drawn from a discrete winding wiring 1021b of the main winding 1021 other The lead line L _e2 is connected to the primary bushing BS1 (−), and the other lead line L _d2 drawn from the split winding 1021a and one lead line L _e1 drawn from the split winding 1021b are connected to each other. The Lead lines L _f1 , L _f2 , L _f3 drawn from the secondary coil 2 are connected to the secondary bushing BS2 (+), the secondary bushing BS2 (−), and the secondary bushing BS (G), respectively.

The transformer A1, by switching the tap terminals _P 1 to P ₄ to be connected to the common terminal _{P c} in tap changer TL, it is possible to switch the number of turns _{n 1} of the primary winding 102 in four steps. Three Komaki lines 1021a, 1021b, the respectively _n a number of turns of the _1021c, n b, and _{n c,} the number of turns of the primary winding 1021 and _{n d,} the number of turns _{n 1} of the primary winding 102, _{(n a + n b + n c + n} d), (n b + n c + n d), can be switched to four kinds of _{(n c + n d),} n d.

  In the following description, a case where the transformer A1 according to the first embodiment is applied to a 6600 [V] / (210-105 [V] transformer for power distribution will be described.

6600 [V] / (210-105) [V] Because the primary voltage input to the primary coil of the transformer greatly fluctuates depending on the distance from the distribution substation around the customer where the transformer is arranged, In general, power is transmitted from a distribution substation at a voltage higher than 6600 [V]. Therefore, the primary voltage v ₁ input to the primary coil 1 of the transformer A has a high voltage of 6600 [V] or more at a location near the distribution substation, and is 6600 [V] or less at a location far from the distribution substation. May be high pressure.

Transformers A1 according to the first embodiment, by adjusting the number of turns of the primary coil 1 into four stages according to the size of the primary voltage v _1, second stable from the secondary coil 2 (210-105) [V] and to be able to output the following voltage v _2. Specifically, the primary voltage v ₁ is divided into four types of v _A , v _B , v _C , and v _D (v _A > v _B > v _C > v _D ), and four taps are associated with each voltage value. ing.

The transformation ratio of the transformer A1 is represented by (v ₁ / v ₂ ) = (n ₁ / n ₂ ). Since v ₂ and n ₂ are fixed, the number of turns n ₁ of the primary winding 102 is proportional to the primary voltage v ₁ . Therefore, the number of turns (n _a + n _b + n _c + n _d ), (n _b + n _c + n _d ), (n _c + n _d ), and (n _c + n _d ) are applied to the voltages v _A , v _B , v _C , v _D of each tap. ) And n _d correspond to each other.

The tap voltages v _A , v _B , v _C , and v _D are usually determined by standards, customer specifications, and the like. For example, when v _A = 6750 [V], v _B = 6600 [V], v _C = 6450 [V], and v _D = 6300 [V], v _A −v _B = v _B −v _C = _{v C -v} D = 150 because it is _[V], a _{n a = n b = n c} . That is, the number of turns of the three small windings 1022a, 1022b, and 1022c is the same.

  Next, the structure of the primary coil 1 and the secondary coil 2 is demonstrated. First, the structure of the primary coil 1 will be described with reference to FIGS.

In the following description, the case where the four tap voltages of the transformer A according to the first embodiment are set to 6750 [V], 6600 [V], 6450 [V], and 6300 [V] will be described as an example. . In the example in this case, three Komaki lines 1022a, 1022b, the number of turns of 1022c and _{n s, v C / v D} = (n d + n s) / n d = from 6450/6300, primary winding 1021 the number of turns _{n d} and Komaki lines 1022a, 1022b, a relationship of _n d = 42 × _{n s} between the number of turns _{n s} of 1022c.

  3 is a front view of a coil bobbin (coil bobbin according to the present invention) for manufacturing the primary coil 1 of the transformer, FIG. 4 is a front view of the coil bobbin, and FIG. 5 is the same coil bobbin. It is XX sectional drawing in FIG.

  In the following description, in order to distinguish the coil bobbin for manufacturing the primary coil 1 from the coil bobbin for manufacturing the secondary coil, the coil bobbin for the primary coil 1 is referred to as a “first coil bobbin” and used for the secondary coil 2. This coil bobbin is referred to as a “second coil bobbin”.

  3, the surface along the outer periphery of the ring shape is referred to as “outer peripheral side surface”, the surface along the inner periphery is referred to as “inner peripheral side surface”, and the left surface of the bobbin main body 1011 in FIG. In the description, the right side surface is referred to as the “rear surface”.

  The primary coil 1 is formed into a rectangular ring shape using a first coil bobbin 101. As shown in FIGS. 3 and 4, the first coil bobbin 101 includes a bobbin body 1011 having a short rectangular ring shape. The bobbin main body 1011 is produced by molding a resin.

  The bobbin main body 1011 is formed with a concave groove 1012 for winding the primary winding 102 on the outer peripheral side surface, and the outer shape other than the outer peripheral side surface (the inner peripheral side surface portion of the bobbin main body 1011) is semicircular. (See FIGS. 5 and 12).

  The reason why the outer shape of the inner peripheral side surface of the bobbin main body 1011 is semicircular is that a cylindrical iron core C is attached to one of the two long sides of the bobbin main body 1011 as shown in FIG. Therefore, the inner surface of the hole of the iron core C is in close contact with the bobbin main body 1011. Therefore, the radius of the part of the bobbin main body 1011 whose semicircular outer shape is set to a size slightly smaller than the radius of the hole in the iron core C.

  The concave groove 1012 formed on the outer peripheral side surface of the bobbin main body 1011 has a first concave groove 1013 around which the main winding 1021 is wound and a second concave groove 1014 around which the winding number adjusting winding 1022 is wound. . The second concave groove 1014 is formed in the center of the bottom surface 1013B of the first concave groove 1013 in the width direction (lateral direction in FIG. 4).

  A dividing wall 1018 that divides the space of the groove 1012 in the width direction is provided at the center of the bottom surface of the second groove 1014. In FIG. 4, the space on the left side of the groove 1012 divided by the dividing wall 1018 corresponds to the “first space”, and the space on the right side corresponds to the “second space”.

  The dividing wall 1018 is provided perpendicular to the bottom surface 1014B so as to be parallel to both inner wall surfaces 1014A of the second concave groove 1014. The dividing wall 1018 is a thin plate-like member having a height from the bottom surface 1014B to the vicinity of the upper end of the inner wall surface 1013A on the front side of the first concave groove 1013. The dividing wall 1018 is provided on the bottom surface 1014B of the bobbin main body 1011 by integral molding of resin.

  The cross-sectional shape of the second groove 1014 taken along line XX in FIG. 4 (hereinafter, this shape is referred to as “cross-sectional shape”) is such that both inner wall surfaces 1014A have a bottom surface 1014B of the second groove 1014. It has a vertically rising shape (rectangular shape) (see FIG. 5). This is because the number of turns when the three small windings 1022a, 1022b, and 1022c are aligned and wound in two layers in the first space of the second concave groove 1014, respectively.

  On the other hand, the first concave groove 1013 has a shape (an isosceles trapezoidal shape) that rises so that both inner wall surfaces 1013A are inclined outward at a predetermined inclination angle θ with respect to the bottom surface 1013B of the first concave groove 1013. (See FIG. 6). The details of the cross-sectional shape and size of the first groove 1013 and the second groove 1014 will be described later.

  The rectangular external dimension (L1 (length in the longitudinal direction) × W1 (length in the short direction)) of the front side of the bobbin body 1011 is the rectangular external dimension (L2 (longitudinal direction) in the back side of the bobbin body 1011). (Length) × W2 (length in the short direction))). As shown in FIG. 12, the first coil bobbin 101 is fitted into the hole portion of the second coil bobbin 201, and the coil part B is arranged outside the primary coil 1 and the secondary coil 2 is concentrically arranged. This is to make the structure.

  Therefore, the rectangular outer dimension (L1 × W1) on the front side of the bobbin main body 1011 is equal to the rectangular dimension (L3 (length in the longitudinal direction) × W3 (length in the short direction) of the hole portion of the second coil bobbin 201. S)) The size is set slightly smaller than (see FIG. 6). On the other hand, the rectangular outer dimension (L2 × W2) on the back side of the bobbin main body 1011 is equal to the outer dimension of the second coil bobbin 201 having a rectangular ring shape (L4 (longitudinal length) × W4 (short direction). The length is set to be approximately the same as the length)) (see FIG. 6).

Of the side surface on the front side of the bobbin main body 1011, five notches 1015A, 1015B, 1015C, 1015D, and 1015E are provided on one long side portion (the long side portion on the right side in FIG. 3). Yes.
Notches 1015A draws one of the lead lines _{L a1} of the first small roll line 1022a that is wound regularly in a space of the second groove 1014 to the outside of the bobbin main body 1011, notches 1015B is Komaki The other lead line L _a2 of the wire 1022a and one lead line L _b1 of the small winding 1022b are pulled out to the outside of the bobbin main body 1011, and the notch 1015C is connected to the other lead line L _b2 of the small winding 1022b and the small winding One lead line L _c1 of the line 1022c is to be pulled out of the bobbin main body 1011.
Further, notches 1015D is the other lead wire _{L c2} of Komaki line 1022c first one lead wire of the discrete winding wirings 1021a main winding 1021 is wound regularly in a space of the first groove 1013 the L _d1 drawer outside of the bobbin main body 1011, notches 1015E is for pulling out the other lead wire _{L e2} discrete winding wirings 1021a to the outside of the bobbin main body 1011.

On the other hand, a notch 1015F is provided at a position facing the notch 1015E on the side surface on the back side of the bobbin main body 1011. A notch 1015G is provided at a position facing the notch 1015A (see FIG. 4). ). Notches 1015F is for pulling out one of the lead wire _{L e1} discrete winding wirings 1021b of the second primary winding 1021 is wound regularly in a space of the recessed groove 1012 on the outside of the bobbin main body 1011, cut away portion 1015G is for pulling out the other lead wire _{L e2} discrete winding wirings 1021b main winding 1021 to the outside of the bobbin main body 1011. In the following description, the notch portion is referred to as a “winding lead portion”.

  The three winding lead portions 1015A, 1015B, and 1015C have a depth from the outer peripheral side surface of the bobbin main body 1011 to the bottom surface 1014B of the second concave groove 1014, and the second concave groove from the front side of the bobbin main body 1011. It is formed so as to penetrate to 1014 (see FIG. 5). The winding lead portion 1015F also has a depth from the outer peripheral side surface of the bobbin main body 1011 to the bottom surface 1014B of the second concave groove 1014, and is formed so as to penetrate from the back side of the bobbin main body 1011 to the second concave groove 1014. Has been.

The winding lead portion 1015D has a depth from the outer peripheral side surface of the bobbin main body 1011 to the bottom surface 1013B of the first concave groove 1013, and is formed so as to penetrate from the front side of the bobbin main body 1011 to the first concave groove 1013. (See FIG. 5). The winding lead portion 1015E has a depth from the outer peripheral side surface of the bobbin main body 1011 to a predetermined depth position of the first concave groove 1013, and penetrates from the front side of the bobbin main body 1011 to the first concave groove 1013. (See FIG. 5).
The winding lead portion 1015G has a depth from the outer peripheral side surface of the bobbin main body 1011 to the upper end position of the inclined inner wall 1013A of the first concave groove 1013, and the first concave groove 1013 from the back side of the bobbin main body 1011. It is formed so as to penetrate through.

  In order to increase the cooling effect of the primary coil 1 by the winding lead portions 1015A to 1015F, the bobbin lead portion 1015D and the winding lead portion 1015E are connected to the bobbin main body 1011 as shown by an imaginary line (double-dotted line) in FIG. It may have a depth from the outer peripheral side surface to the bottom surface 1014B of the second concave groove 1014, and may penetrate from the front side of the bobbin main body 1011 to the second concave groove 1014. The winding lead portion 1015G has a depth from the outer peripheral side surface of the bobbin main body 1011 to the bottom surface 1014B of the second concave groove 1014, and penetrates from the back side of the bobbin main body 1011 to the second concave groove 1014. You may form in.

  Next, the cross-sectional shape and size of the first groove 1013 and the second groove 1014 will be described. First, the cross-sectional shape and size of the second concave groove 1014 will be described.

The second groove 1014, three Komaki lines 1022a, 1022b, in order to only regular winding respectively turns _{n s} a 1022c, and has a rectangular cross-sectional shape. As shown in FIG. 9, a first guide for guiding the winding position so that the small winding 1022a and the divided winding 1021b wound around the bottom surface 1014B are aligned on the bottom surface 1014B of the second concave groove 1014. A groove 1016 is provided.

First In the embodiment, as shown in FIG. 10, primary Komaki line 1022a that is disposed at one end of the winding 102, the bobbin main body 1011 one of the leader line _{L a1} from the winding draw-out portion 1015A In a state of being pulled out to the outside, the inner wall surface 1014A of the second concave groove 1014 is wound around the first guide groove 1016 to the dividing wall 1018. After that, the small winding 1022a is folded and wound to the original inner wall surface 1014A (the inner wall surface 1014A having the winding lead portion 1015A) on the upper side of the wound small winding 1022a, and then the other lead line L _a2. Is pulled out of the bobbin main body 1011 from the winding lead portion 1015A.

The first layer of the small winding 1022a is wound around the bottom surface 1014B of the second concave groove 1014 along the first guide groove 1016, but the second and subsequent layers of the small winding 1022a are arranged in the lower aligned winding. It is wound using a recess between windings formed on the upper surface as a guide. When the number of layers of the small winding 1022a is 2 × k (k is a positive integer), the number of turns of each layer is n _s / (2 × k) [turns], and thus the winding is used for the winding adjustment winding 1022. When the wire diameter of the winding is φ ₁ [mm], the dimension in the width direction of the winding wound in an aligned manner in each layer is φ ₁ × n _s / (2 × k).

Winding which is wound regularly under the Komaki line 1022a is, phi _1/2 in the width direction of the bottom surface 1014B respect windings wound regularly on the upper layer [mm] only the position is shifted, in the first space the dimensions of the width direction of the second groove 1014 w1 [mm] (see FIG. 10) _{is, w1 = φ 1 × n s} / (2 × k) + φ 1/2 = (φ 1/2) × [(n _s / k) +1].

The first guide groove 1016, φ _1/2 [mm] cross-sectional shape with a short groove width than is the groove arcuate (see Fig. 9). The first guide grooves 1016 are formed in a width direction of the bottom surface 1014B of the second concave groove 1014 at a pitch of φ ₁ [mm] n _s / (2 × k) [lines].

As shown in FIG. 10, the small winding 1022b of the winding number adjusting winding 1022 is wound in a two-layer structure on the outer side (upper side in FIG. 10) of the small winding 1022a. Komaki line 1022b is a top of the second layer of one of the small roll line 1022a from the inner wall surface 1014A of the second groove 1014 leader line _{L b1} when it is slid out from the winding draw-out portion 1015B outside of the bobbin main body 1011 The winding is formed up to the dividing wall 1018 using a recess between the windings formed as a guide. Thereafter, the small winding 1022b is folded and wound on the upper side of the wound small winding 1022a up to the original inner wall surface 1014A (the inner wall surface 1014A having the second concave groove 1014), and then the other lead wire L _b2 is drawn out of the bobbin main body 1011 from the winding lead portion 1015B.

As shown in FIG. 10, the small winding 1022c of the winding adjustment winding 1022 is wound in a two-layer structure on the outside (upper side in FIG. 10) of the small winding 1022b. Komaki line 1022b is a top of the second layer of one of the small roll line 1022b from the inner wall surface 1014A of the second groove 1014 lead wire _{L c1} with pulled out from the winding draw-out portion 1015C outside of the bobbin main body 1011 The winding is formed up to the dividing wall 1018 using a recess between the windings formed as a guide. After that, the small winding 1022c is folded and wound up to the original inner wall surface 1014A (the inner wall surface 1014A having the second concave groove 1014) on the upper side of the wound small winding 1022b, and then the other leader line L _c2 is drawn out of the bobbin main body 1011 from the winding lead portion 1015C.

Similarly to the small winding 1022a, the small windings 1022b and 1022c have n _s / (2 × k) [turns] as the number of turns in each layer. φ ₁ × n _s / (2 × k).

In the second concave groove 1014, the winding number adjusting winding is so arranged that the small windings 1022 a, 1022 b, 1022 c arranged in three (2 × k) layers are stacked in a three-stage (6 × k) layer. Since the wire 1022 is wound, the dimension h ₁ [mm] (see FIG. 10) of the depth of the second groove 1014 is Δh ₁ [mm] when the dimension of the overlapping portion of the windings of each layer is It is set to about (number of stacked layers−1) × (φ ₁ −Δh ₁ ) + φ ₁ = (6 × k−1) × (φ ₁ −Δh ₁ ) + φ ₁ [mm].

  Next, the cross-sectional shape and size of the first concave groove 1013 will be described.

  The first groove 1013 has an isosceles trapezoidal cross-sectional shape in which the length of the upper base is longer than the length of the lower base, and the inner angles of both ends of the lower base are 120 °. That is, both inner wall surfaces 1013A of the first groove 1013 are inclined at an inclination angle θ = 120 ° with respect to the bottom surface 1013B so that the opening of the first groove 1013 becomes wider toward the outer peripheral side surface. Yes.

  The space of the first groove 1013 is divided into two in the width direction by a dividing wall 1018 projecting at the center in the width direction of the second groove 1014, so that the divided winding 1021a is aligned and wound. The first space of one concave groove 1013 has a trapezoidal cross-sectional shape in which the inner angle on the left side of the lower base is 120 ° and the inner angle on the right side is a right angle, and the first space in which the divided windings 1021b are wound in an aligned manner. The second space of the concave groove 1013 has a trapezoidal cross-sectional shape in which the left inner angle of the lower base is a right angle and the right inner angle is 120 °.

  As shown in FIG. 11, both inner wall surfaces 1013A of the first groove 1013 are inclined at an inclination angle θ = 120 ° with respect to the bottom surface 1013B. This is to increase the space factor of the primary winding 102 in the first concave groove 1013 so that no gap is generated between the inner wall surfaces 1013A.

  The split windings 1021a and 1021b of the main winding 1021 that are aligned and wound in layers are aligned and wound with the upper layer winding being aligned using the depression of the lower aligned winding as a guide. In order to prevent a gap from being formed between the winding of each layer and the inner wall surface 1013A, the inner wall surface 1013A may be made to coincide with the tangent of the winding located at the end of each layer.

As shown in FIG. 11, the winding located at the end of the lower aligned winding and the winding positioned at the upper aligned winding are shifted from each other by φ _1/2 in the width direction. The angle of the tangent to the bottom surface 1013B of the winding located at 120 is 120 °. Therefore, the inclination angle θ of both inner wall surfaces 1013A of the first concave groove 1013 with respect to the bottom surface 1013B is set to 120 °.

  Similarly to the bottom surface 1014B of the second concave groove 1014, the bottom surface 1013B of the first concave groove 1013 is a first one for guiding the winding position so that the main windings 1021 wound around the first concave groove 1013 are aligned. Two guide grooves 1017 are provided.

The second guide groove 1017 is a groove having an arcuate cross-sectional shape that is the same size as the first guide groove 1016. Similar to the first guide groove 1016, the second guide groove 1017 is formed on the bottom surface 1013B of the first concave groove 1013 at a pitch of φ ₁ [mm] in the width direction (see FIG. 11).

Discrete winding 1021a of the primary winding 1021, a second guide groove from the inner wall surface 1013A of the first groove 1013 to one of the leader line _{L d1} at pulled out to the outside of the bobbin main body 1011 from the winding draw-out portion 1015D 1017 is wound along. The divided winding 1021a is folded back when it is wound up to the dividing wall 1018, and the original inner wall surface 1013A (using the depression between the windings formed on the upper side of the aligned divided winding 1021a as a guide is used. It is wound up to the inner wall surface 1014A) having the winding lead portion 1015D. After that, the main winding 1021 is folded each time it reaches the dividing wall 1018 and the inner wall surface 1013A with a depression between the windings formed on the upper side of the main winding 1021 of each layer wound in an aligned manner as a guide. Is wound until a predetermined number is reached, and the other lead wire L _d2 is drawn out of the bobbin main body 1011 from the winding lead portion 1015E.

On the other hand, the split winding 1021b of the main winding 1021 has a second lead wire L _e1 extending from the inner wall surface 1013A of the first groove 1013A to the second lead wire Le1 from the winding lead portion 1015F to the outside of the bobbin main body 1011. It is wound along the guide groove 1017. The divided winding 1021b is folded back when it is wound up to the dividing wall 1018, and the original inner wall surface 1013A (using the depression between the windings formed on the upper side of the aligned divided winding 1021b is used as a guide. It is wound up to the inner wall surface 1014A) having the winding lead portion 1015E. After that, the main winding 1021 is folded each time it reaches the dividing wall 1018 and the inner wall surface 1013A with a depression between the windings formed on the upper side of the main winding 1021 of each layer wound in an aligned manner as a guide. There is wound until a predetermined number, the other lead wire L _e2 is drawn from the winding draw-out portion 1015G outside of the bobbin main body 1011.

As described above, the main winding 1021 has the divided windings 1021a aligned and wound in layers in the first space of the first concave grooves 1013, and the divided winding 1021b has the second concave grooves 1014 and the first concave grooves. 1013 is wound in a layered manner in the second space. Wire main winding 1021 is identical to the wire turns adjusting winding 1022, the number of turns _{N 1} in the second space of the second groove 1014 of the split windings 1021b is number of turns adjusting winding This is the same as the number of turns (3 × n _s ) in the second space of the second concave groove 1014 of 1022.

Accordingly, approximately (n _d −3 × n _s ) [turns] of the number of turns n _d of the main winding 1021 are wound in the first concave groove 1013. When the number of stacked main windings 1021 in the first groove 1013 is m, the depth dimension h ₂ [mm] (see FIG. 10) of the first groove 1013 is Δh When [mm], is set to approximately (m-1) × (φ 1 -Δh) + φ 1 [mm].

  In the first coil bobbin 101 according to the first embodiment, since the iron core C is wound around the left leg portion when viewed from the front, the winding lead-out portions 1015A to 1015A to the portion corresponding to the right leg portion when viewed from the front. Although 1015G is formed, the winding lead-out portions 1015A to 1015G may be formed in a portion corresponding to the left leg portion when viewed from the front, and the iron core C may be wound around the right leg portion when viewed from the front. .

  In the first coil bobbin 101 according to the first embodiment, the winding lead portions 1015A to 1015E are formed on the front side surface (left side surface), and the winding is formed on the back side surface (right side surface). The lead portions 1015F and 1015G are formed, but the winding lead portions 1015A to 1015E are formed on the rear side surface (right side surface), and the winding lead portions 1015F and 1015G are formed on the front side surface (left side surface). May be formed.

  That is, in FIG. 4, the winding lead portions 1015A to 1015E are formed on the right side surface so that the winding lead portions 1015A to 1015E and the winding lead portions 1015F and 1015G are symmetric, and the winding lead portions 1015F, 1015G may be formed on the left side surface.

  Next, the structure of the secondary coil 2 will be described with reference to FIGS.

  6 is a view of the second coil bobbin 201 for producing the secondary coil 2 of the transformer A1 as viewed from the front, FIG. 7 is a view of the second coil bobbin 201 as viewed from the right side, and FIG. FIG. 7 is a cross-sectional view of the second coil bobbin 201 taken along line YY in FIG. 6.

  As shown in FIGS. 6 and 7, the second coil bobbin 201 includes a bobbin main body 2011 having a short rectangular ring shape. The bobbin main body 2011 has a height dimension (dimension in the width direction in FIG. 7) that is substantially the same as the bobbin main body 1011.

  The shape viewed from the side surface of the bobbin main body 2011 is substantially bilaterally symmetric. However, in the following, for convenience of explanation, in FIG. 6, the surface along the outer periphery of the ring shape is referred to as the “outer peripheral side surface” and extends along the inner periphery. The surface is referred to as an “inner peripheral side surface”, and in FIG. 7, the left surface of the bobbin main body 2011 is referred to as “front”, and the right surface is referred to as “rear surface”.

  The bobbin main body 2011 is formed with a concave groove 2012 for winding the secondary winding 202 (see FIG. 8) on the outer peripheral side surface, and the shape of the hole portion is formed in a rectangular parallelepiped shape (FIG. 8, FIG. 8). (See FIG. 12). The reason why the shape of the hole portion of the bobbin main body 2011 is a rectangular parallelepiped shape is because the bobbin main body 1011 is fitted and attached to the hole portion as shown in FIG.

  The rectangular dimension (L3 (length in the longitudinal direction) × W3 (length in the short direction)) of the hole portion of the bobbin body 2011 is the rectangular outer dimension (L1 on the front side of the bobbin body 1011 as described above. × W1) is set slightly larger than the size. Further, the rectangular external dimensions (L4 (length in the longitudinal direction) × W4 (length in the short direction)) of the outer peripheral side surface of the bobbin main body 2011 are the rectangular external dimensions on the back side of the bobbin main body 1011 as described above. The dimension is set to be approximately the same as the dimension (L2 × W2).

  Of the ring-shaped side surface on the front side of the bobbin main body 2011, one notch portion 2013 is provided at the center portion of one long side (the long side portion on the left side in FIG. 6). The notch 1013 is for pulling out both ends of the secondary winding 202 wound around the concave groove 2012 and the intermediate position c to the outside of the bobbin main body 2011. In the following description, the notch portion of the bobbin main body 2011 is also referred to as “winding lead portion”.

The winding lead portion 2013 has a depth from the outer peripheral side surface of the bobbin main body 2011 to the bottom surface 2012B of the concave groove 2012, and is formed so as to penetrate from the front side of the bobbin main body 2011 to the concave groove 2012. Both ends of the secondary winding 202 drawn out from the winding lead-out portion 2013 of the bobbin main body 2011 correspond to the lead lines L _f1 and L _f2 in FIG. 12, and the intermediate position c of the secondary winding 202 is shown in FIG. Corresponds to the leader line L _f3 .

  The concave groove 2012 has a shape (rectangular cross-sectional shape) in which both inner wall surfaces 2012A rise perpendicularly to the bottom surface 2012B of the concave groove 2012 (see FIG. 8). Similar to the bottom surface 1014B of the second concave groove 1014, the bottom surface 2012B of the concave groove 2012 is provided with a guide groove 2014 for guiding the winding position so that the secondary winding 202 wound around the bottom surface 2014B is aligned. It has been.

The secondary winding 202 is wound along the guide groove 2014 from the inner wall surface 2012 </ b> A of the recessed groove 2012 in a state where one lead line L _f <b> 1 is drawn from the winding lead portion 2013 to the outside of the bobbin main body 1011. When the secondary winding 202 is wound up to the inner wall surface 2012A on the opposite side, the secondary winding 202 is folded back, and a recess between the windings formed on the upper side of the aligned secondary winding 202 is used as a guide. To the inner wall surface 2012A (the inner wall surface 2012A having the winding lead portion 2013). Thereafter, the secondary winding 202 is folded each time it reaches the inner wall surface 2012A with a depression between the windings formed on the upper side of the secondary winding 202 of each layer that has been aligned aligned as a guide. The other lead wire L _f2 is drawn out from the winding lead portion 2013 to the outside of the bobbin main body 2011.

The first layer of the secondary winding 202 is wound around the bottom surface 2012B of the concave groove 2012 along the guide groove 2014. The second layer of the secondary winding 202 is a winding formed on the top surface of the first layer. It can be wound with a hollow between each other as a guide. When the number of turns of each layer of the secondary winding 202 is n _t [turns] and the wire diameter of the winding used for the secondary winding 202 is φ ₂ (> φ ₁ ) [mm], the bottom surface of the concave groove 2012 The dimension in the width direction of 2012B is set to φ ₂ (= n _t +1/2).

Further, if j is the number of laminated secondary windings 202 in the concave groove 2012, there is a relationship of n ₂ = n _t × j, and the depth dimension h ₂ [mm] of the concave groove 2012 is an overlapping portion of each layer. When the dimensions and Δh ₂ [mm], is set to approximately (j-1) × (φ 2 -Δh 2) + φ 2 [mm].

In the concave groove 2012 of the bobbin main body 2011, the winding wound around each layer can be wound by being aligned with the pitch of the wire diameter φ _{2 in} the width direction of the concave groove 2012.

  The primary coil 1 manufactured by aligning and winding the primary winding 102 in the concave groove 1012 of the first coil bobbin 101 having a rectangular ring shape is a second coil bobbin 201 having a secondary ring 202 having a rectangular ring shape. As shown in FIG. 12, the first coil bobbin 101 is fitted into the hole portion of the second coil bobbin 201 from the front side and integrated with the secondary coil 2 manufactured by aligning and winding in the concave groove 2012. It becomes. Thereby, the coil part B which has arrange | positioned the secondary winding 202 concentrically on the outer side of the primary winding 102 is manufactured.

  Next, functions and effects of the first coil bobbin 101 according to the first embodiment will be described.

  The first coil bobbin 101 according to the first embodiment includes a concave groove for winding a primary winding 102 having a main winding 1021 and three small windings 1022a, 1022b, and 1022c connected in series with each other. The structure is characterized in that the space 1012 is divided in the width direction by a dividing wall 1018 protruding at the center of the bottom surface 1014B of the second concave groove 1014.

With this structure, when the small windings 1022a, 1022b, and 1022c of the winding number adjusting winding 1022 are arranged in three stages in the second concave groove 1014, for example, each small winding when the dividing wall 1018 is not provided. 1022a, 1022b, in the number of stacked 1022c two layers, if the turn number _n s / 2 per layer, as shown in FIG. 13, the number of stacked when provided with dividing wall 1018 becomes four layers, The number of turns per layer is n _s / 4. That is, the number of turns per layer is ½ that when the dividing wall 1018 is not provided.

For example, if the switching piece TC of tap changer TL is set to the position connecting the common terminal P _c to the tap terminals P _1, the pressure across the primary winding 102 is approximately 6750 [V] is applied . The high voltage v _s of about 6750 [V] at a position s where the aligned winding of the small winding 1022a is started (a position where the lead line L _a1 is drawn from the winding lead portion 1015A; hereinafter referred to as “aligned winding start position s”). In the first embodiment, since the potential difference between both ends of the small winding 1022a is 150 [V], the position e where the aligned winding of the small winding 1022a ends (the leader line _La2 is the winding) position drawn from the extraction unit 1015A. hereinafter, pressure _{v e} of "regular winding end position e" hereinafter.) approximately 6600 [V] in is induced.

When the number of the small windings 1022a is two, the turn at the aligned winding start position s and the turn at the aligned winding end position e having the largest potential difference are adjacent to each other in the vertical direction. When a potential difference of the winding lines of the second layer, the potential difference v _se between the turns of the turn and regular winding end position e of the regular winding start position s ₍₌ v s _{-v e)} is maximized. Therefore, when the insulating film coated on the wire of Komaki line 1022a does not have a large withstand voltage characteristics than the potential difference v _se, because there is a risk of breakdown in the interlayer of Komaki line 1022a insulating sheet such as It is necessary to provide an insulating member. This problem is the same when the small winding 1022b, the small winding 1022c, and the main winding 1021 are aligned and wound in layers.

In the first embodiment, the small winding 1022a is aligned and wound in four layers in the first space of the second concave groove 1014. Therefore, between the first layer and the second layer, the small winding 1022a The potential difference between the turn at the aligned winding start position s and the turn above it is the largest among the potential differences between the layers, and the position where the small winding 1022a is folded at the dividing wall 1018 between the second and third layers. The potential difference between the current turn and the turn above it is the largest among the potential differences between the layers, and between the third and fourth layers, the turn of the aligned winding end position e of the small winding 1022a and the turn below it The potential difference between them becomes the maximum among the potential differences between the layers.
For example, if the voltage induced at the position q of the second layer adjacent to the aligned winding start position s is v _q , the potential difference v _sq between the turn at the aligned winding start position s and the turn at the position q (= v _s − v _q ) is approximately ½ of the potential difference v _se . That is, the maximum value of the potential difference between the first and second layers is v _se / 2. The maximum value of the potential difference between the first layer, the second layer, the third layer, and the fourth layer is the same as the maximum value of the potential difference between the first layer and the second layer, and is v _se / 2.

  Therefore, according to the first embodiment, the withstand voltage between the layers can be reduced to about ½ when the dividing wall 1018 is not provided. Also, by providing the dividing wall 1018, the number of turns per layer of the main winding 1021 aligned and wound in the first concave groove 1013 can be reduced as compared with the case without the dividing wall 1018. There is also an advantage that the interlayer voltage of 1021 can be lowered.

  In addition, since the first guide groove 1016 for aligning and winding the small winding 1022a is provided on the bottom surface 1014B of the second concave groove 1014, the small winding 1022a is easily aligned with the first coil bobbin 101 without a gap. Can be wound. Then, the small windings 1022a positioned on the basis of the lamination are aligned and wound with no gap, so that the small windings 1022b and 1022b stacked on the outer side (upper side) of the small winding 1022a can be easily aligned with no gaps. can do.

In addition, since the cross-sectional shape of the second groove 1014 is rectangular, the three small windings 1022a, 1022c, and 1022c can be easily placed in the first space of the second groove 1014 with the same number of turns. Can be aligned and wound. Further, since the small windings 1022 a, 1022 c, and 1022 c are arranged in two layers, both ends of each small winding can be pulled out in the same direction with respect to the first coil bobbin 101. That is, the lead lines L _a1 and L _a2 of the small winding 1022a, the lead lines L _b1 and L _{b2 of} the small winding 1022b, and the lead lines L _c1 and L _c2 of the small winding 1022c are arranged on the front side surface of the coil bobbin 101. It can be pulled out from the four winding lead portions 1015A to 1015D that are formed.

  1, 5, and 10, the cross-sectional shape of the first concave groove 1013 is such that the width dimension of the bottom surface 1013 </ b> B of the first concave groove 1013 is greater than the width dimension w <b> 1 of the second concave groove 1014. However, the shape may be an isosceles trapezoid in which the dimension in the width direction of the bottom surface 1013B is substantially the same as the dimension w1 in the width direction of the second concave groove 1014.

  The operation and effect of the first coil bobbin 101 according to the present invention has been described with respect to the small winding 1022a. However, the same operation and effect are also obtained for the small windings 1022b and 1022c and the main winding 1021 that are aligned and wound in layers. Have

  Therefore, according to the first coil bobbin 101 according to the first embodiment, it is possible to insulate between the layers only by the insulating film covered with the wire of the small winding 1022a without providing an insulating sheet or the like between the layers. Therefore, it is possible to reduce the number of parts such as insulating members and the manufacturing cost of the primary coil 1.

  Next, a transformer according to the second embodiment will be described.

  FIG. 14 is a perspective view showing the configuration of the main part of the transformer A2 according to the second embodiment, FIG. 15 is a view of the first coil bobbin 101 ′ of the transformer A2 as viewed from the front, and FIG. The figure which looked at 1st coil bobbin 101 'of the transformer A2 from the right side, FIG. 17: is the ZZ sectional view taken on the line in FIG. 16 of the transformer A2. FIG. 18 is a diagram showing a circuit configuration of the transformer A2, and FIG. 19 shows a winding method of the main winding 1013 and the winding number adjusting winding 1014 in the concave groove 1012 ′ of the first coil bobbin 101 ′. It is a figure for demonstrating.

  The external appearance of the transformer A2 shown in FIG. 14 differs from the external appearance of the transformer A1 shown in FIG. 1 only in the configuration of the winding lead portion in the first coil bobbin 101 ′, and the shape and size of the transformer A2 are the same. It is the same as transformer A1. Therefore, in the description of the external appearance of the transformer A2, only the difference regarding the configuration of the winding lead portion will be described, and description of the other configuration will be omitted.

  As will be described later, in the transformer A2 according to the second embodiment, two small windings 1022a and 1022b of the winding adjustment winding 1022 are aligned and wound on the upper layer of the split winding 1021a of the main winding 1021, The small winding 1022c of the winding number adjusting winding 1022 is aligned and wound on the upper layer of the divided winding 1021b of the main winding 1021.

  Therefore, in the concave groove 1012 according to the first embodiment, the second concave groove 1014 is formed in the bottom surface 1013B of the first concave groove 1013, but the concave groove 1012 according to the second embodiment. In FIG. 16 (see FIG. 16), a second groove 1014 is provided on the upper portion of the first groove 1013.

  The two small windings 1022a and 1022b of the split winding 1021a of the main winding 1021 and the winding number adjusting winding 1022 are divided into the split winding 1021a, the small winding 1022a, the small winding 1021a from the bottom surface of the first space of the concave groove 1012 ′. The windings are arranged in layers in the order of the windings 1022b. The divided winding 1021a is aligned and wound in an even number of layers so as to have a predetermined number of turns, and the small winding 1022a is aligned and wound in one layer on the outside (upper layer) of the divided winding 1021a. Are aligned and wound in one layer on the outside (upper layer) of the small winding 1022a.

  The divided winding 1021b of the main winding 1021 and the small winding 1022c of the winding number adjusting winding 1022 are layered in the order of the divided winding 1021b and the small winding 1022c from the bottom surface of the second space of the concave groove 1012 ′. Aligned winding. The divided winding 1021b is aligned and wound in an odd number of layers so as to have a predetermined number of turns, and the small winding 1022c is aligned and wound in one layer on the outer side (upper layer) of the divided winding 1021b.

  Accordingly, in order to draw out both end portions of the divided winding 1021a and the small windings 1022a and 1022b on one long side portion (in FIG. 15, the long side portion on the right side) of the front side surface of the bobbin main body 1011 ′. The four winding lead portions 1015A ′, 1015B ′, 1015C ′, and 1015D ′ are formed. Further, three pieces for pulling out both end portions of the divided winding 1021b and the small winding 1022c at positions facing the winding lead portions 1015A ′, 1015B ′, 1015C ′ on the side surface on the back side of the bobbin main body 1011 ′, respectively. Winding lead portions 1015E ′, 1015F ′, and 1015G ′ are formed (see FIG. 16).

One lead line L _d1 and the other lead line L _d2 of the divided winding 1021a are led out of the bobbin main body 1011 ′ from the winding lead portion 1015A ′ and the winding lead portion 1015B ′, respectively. One of the lead wire _{L a1} and the other lead wire _{L a2} of Komaki line 1022a, respectively 'winding draw-out portion 1015C' winding draw-out portion 1015B from being drawn out of the bobbin main body 1011 '. One lead line L _b1 and the other lead line L _b2 of the small winding 1022b are led out of the bobbin main body 1011 ′ from the winding lead part 1015C ′ and the winding lead part 1015D ′, respectively.

Further, one lead wire _{L e1} and the other lead wire _{L e2} discrete winding wirings 1021b is drawn 'as winding draw-out portion 1015F' winding draw-out portion 1015E from the outside of the bobbin main body 1011 ', respectively, Komaki line One lead line L _c1 and the other lead line L _c2 of 1022c are led out of the bobbin main body 1011 ′ from the winding lead portion 1015F ′ and the winding lead portion 1015G ′, respectively.

  Even in the first coil bobbin 101 ′ according to the second embodiment, the winding lead portions 1015A ′ to 1015G ′ are formed in a portion corresponding to the right leg portion when viewed from the front side. Winding lead-out portions 1015A ′ to 1015G ′ may be formed in portions corresponding to the leg portions, and the iron core C may be wound around the right leg portion when viewed from the front.

  Also, in the first coil bobbin 101 ′ according to the second embodiment, the winding lead portions 1015A ′ to 1015D ′ are formed on the front side surface (left side surface), and the back side surface (right side surface) is formed. The winding lead portions 1015E ′ to 1015G ′ are formed on the rear side surface (right side surface), and the winding lead portions 1015A ′ to 1015D ′ are formed on the front side surface (left side surface). The winding lead portions 1015E ′ to 1015G ′ may be formed.

  That is, in FIG. 16, the winding lead portions 1015A ′ to 1015D ′ are formed on the right side surface so that the winding lead portions 1015A ′ to 1015D ′ and the winding lead portions 1015E ′ to 1015G ′ are symmetrical. The winding lead portions 1015E ′ to 1015G ′ may be formed on the left side surface.

The circuit configuration of the transformer A2 shown in FIG. 18 is different from the circuit configuration of the transformer A1 shown in FIG. 2 in the configuration of the tap switch TL ′, the main winding 1021 in the primary winding 102, and the winding number adjustment winding. The arrangement relationship of 1022 is different. The tap switch TL of the transformer A1 has the common terminal _Pc , but the tap switch TL ′ of the transformer A2 does not have the common terminal _Pc .

Tap changer TL according to the first embodiment, the primary bushing BS1 (+) is connected to the common terminal P _c, by switching the tap terminals P ₁ to P ₄ to be connected to the common terminal P _c, the primary bushing BS1 (+) and the primary bushing BS1 (-) was a method of switching the number of turns _{n 1} of the primary winding 102 connected between.

As shown in FIG. 18, the tap switch TL ′ according to the second embodiment has _five tap terminals P _{1 to} P ₅ , and switches the pair that connects adjacent tap terminals to perform the primary operation. bushing BS1 (+) and the primary bushing BS1 (-) is a method of switching the number of turns _{n 1} of the primary winding 102 connected between.

  In the primary winding 102 of the transformer A2, the two small windings 1022a, 1022b, and 1022c of the two divided windings 1021a and 1021b of the main winding 1021 and the winding number adjusting winding 1022 are divided into the divided winding 1021a and the small winding. 1022a, a small winding 1022b, a small winding 1022c, and a divided winding 1021b are connected in series in this order, and a winding adjustment winding 1022 is disposed between the divided winding 1021a and the divided winding 1021b.

As shown in FIG. 18, the tap switch TL ′ has five tap terminals P _{1 to} P ₅ and two primary bushing relay terminals Q ₀ and Q ₂ , but has a common terminal P _c. Not. One end of the split winding 1021a is connected to the primary bushing BS1 via the primary bushing relay terminals Q ₀ (+), the other end is connected to the tap terminal P _1. Ends of Komaki line 1022a is connected to the tap terminal P ₁ and the tap terminal _{P 2} respectively, at both ends of Komaki line 1022b is connected to the tap terminal _{P 2} and the tap terminal _{P 3} respectively, opposite ends of Komaki line 1022c are respectively It is connected to the tap terminal _{P 4} and the tap terminal _{P 5.} One end of the divided windings 1021b tap terminal P ₅ and the other end one via the primary bushing relay terminal Q ₂ primary bushing BS1 - is connected to ().

In FIG. 18, similarly to FIG. 2, connection points T _{1 to} T ₅ are shown in order to indicate connection points between the main winding 1021 and the winding number adjustment winding 1022. Thus, in FIG. 18, it is connected to the connection point T ₁ both ends of the split winding 1021a is the primary bushing relay terminals _{Q 0,} respectively, at both ends of Komaki line 1022a is connected to the connection point _{T 2} and the respective connection point _{T 1,} ends of Komaki line 1022b are connected to each connecting point _{T 2} and the connection point _{T 3.} Further, both ends of the split winding 1021b are respectively connected to the connection point _{T 5} and the primary bushing relay terminal _{Q 2,} both ends of Komaki line 1022c is connected to the connection point _{T 4} and the connection point _{T 5,} respectively.

In the tap switch TL ′, tap terminals P _{1 to} P ₅ and two primary bushing relay terminals Q ₀ and Q ₂ are in the order of Q ₂ , P ₁ , P ₅ , P ₂ , P ₄ , P ₃ , Q ₀ . in is arranged, by connecting the tap terminals adjacent to each other in a switching piece TC, primary bushing BS1 (+) and the primary bushing BS1 (-) is the number of turns n ₁ of the primary winding 102 connected between the switched.

In the example of FIG. 18, combinations of connections between adjacent tap terminals are connection 1 (P ₁ , P ₅ ), connection 2 (P ₅ , P ₂ ), connection 3 (P ₂ , P ₄ ), connection 4 ( P ₄ and P ₃ ). When the number of turns of the split winding 1021a and the split winding 1021b of the main winding 1021 is n _da and n _db , respectively, the number of turns n ₁ of the primary winding 102 corresponding to connection 1 to connection 4 is
Connection 1 (P ₁ , P ₅ ): n ₁ = n _da + n _db = n _d
Connection 2 (P ₅ , P ₂ ): n ₁ = n _da + n _a + n _db = n _d + n _s
Connection 3 (P ₂ , P ₄ ): n ₁ = n _da + n _a + n _c + n _db = n _d + 2 × n _s
Connection _{4 (P 4, P 3)} : n 1 = n da + n a + n b + n c + n db = n d + 3 × n s
However, n _d = n _da + n _db , n _a = n _b = n _c = n _s
It has become.

  Therefore, the relationship between the connection 1 to the connection 4 and the tap voltage is as follows: connection 1 = 6300 [V], connection 2 = 6450 [V], connection 3 = 6600 [V], connection 4 = 6750 [V]. .

The transformer A2 according to the second embodiment, the transformer when A2 is accommodated in the tank, the lead wire L _d1 one drawn from a discrete winding wiring 1021a main windings 1021, primary bushing relay terminal Q through ₀ are connected to the primary bushing BS1 (+), the other lead wire _{L d2} is connected to the tap terminal _{P 1} of the tap changer TL '. The other lead wire _{L e2} drawn from a discrete winding wiring 1021b of the main windings 1021, primary bushing BS1 via the primary bushing relay terminal _{Q 2} (-) is connected to, one of the leader line _{L e1} is tap changer It is connected to the tap terminals _{P 5} vessels TL '.

Further, the lead lines L _a1 , L _a2 , L _b1 , L _b2 , L _c1 , and L _c2 drawn from the three small windings 1022 a, 1022 b, and 1022 c of the winding number adjusting winding 1022 are the lead lines L _a1 , L _a2 is connected to the tap terminal P ₁ and tap terminal P ₂ of the tap changer TL ′, the lead lines L _b1 and L _b2 are connected to the tap terminal P ₂ and tap terminal P ₃ of the tap changer TL ′, and the lead lines L _c1 , L _c2 is connected to the tap terminal P ₄ and the tap terminal P ₅ of the tap switch TL ′, respectively. Lead lines L _f1 , L _f2 , and E _f3 drawn from the secondary coil 2 are connected to the secondary bushing BS2 (+), the secondary bushing BS2 (−), and the secondary bushing BS (G), respectively.

  Next, the shape of the concave groove 1012 ′ formed on the outer peripheral side surface of the first coil bobbin 101 ′ and the winding method of the main winding 1021 and the winding number adjusting winding 1022 around the concave groove 1012 ′ will be described.

  The cross-sectional shape of the concave groove 1012 ′ has a shape in which a rectangle is connected to the upper part of an isosceles trapezoid in which the length of the upper base is longer than the length of the lower base and the inner angles of both ends of the lower base are 120 °. Yes. The portion of the groove 1012 ′ whose cross-sectional shape is an isosceles trapezoid corresponds to the first groove 1013 around which the main winding 1021 is wound, and the rectangular portion is a portion around which the winding number adjusting winding 1022 is wound. This corresponds to two concave grooves 1014.

Therefore, the concave groove 1021 ′ according to the second embodiment is provided with a second concave groove 1014 on the upper portion of the first concave groove 1013, contrary to the concave groove 1021 according to the first embodiment 1. ing. Also in the second embodiment, the concave groove 1012 ′ is divided into a region where the cross-sectional shape is an isosceles trapezoid and a region where the shape is a rectangle. The region is a first groove 1013, and the portion of the rectangular portion is the second groove 1014.
It is only doing.

  The cross-sectional shape of the concave groove 1012 ′ is such that the both side wall surfaces rise from the bottom to the predetermined first height position M (see FIG. 17) at an inclination angle θ = 120 ° and then rise to the predetermined second, It may be seen as a hexagonal shape that rises vertically up to the height position (opening surface of the concave groove 1012 ′).

  In the center of the bottom surface 1012B of the first groove 1013, a dividing wall 1018 is provided that divides the space of the groove 1012 'in the width direction. The dividing wall 1018 is provided perpendicular to the bottom surface 1013 </ b> B of the first concave groove 1013. The dividing wall 1018 is a thin plate-like member having a height from the bottom surface 1013B of the first groove 1013 to the vicinity of the opening surface on the front side of the groove 1012 '. The dividing wall 1018 is provided on the bottom surface 1013B of the bobbin main body 1011 'by integral molding of resin.

  16 and 17, the space on the left side of the groove 1012 ′ divided by the dividing wall 1018 corresponds to the “first space”, and the space on the right side corresponds to the “second space”. In the first space of the concave groove 1012 ′, the split winding 1021a of the main winding 1021 is wound around the trapezoidal portion of the cross-sectional shape, and the small number of turns of the winding adjustment coil 1022 is wound around the rectangular portion of the cross-sectional shape. A wire 1022a and a small winding 1022b are wound. Further, in the second space of the concave groove 1012 ′, the split winding 1021b of the main winding 1021 is wound around the trapezoidal portion of the cross-sectional shape, and the winding number adjusting winding 1022 is wound around the rectangular portion of the cross-sectional shape. The small winding 1022c is wound.

  A guide groove (not shown) for guiding the winding position is provided on the bottom surface 1013B of the first concave groove 1013 so that the divided windings 1021a and 1021b of the main winding 1021 are aligned.

  Four winding lead portions 1015A ′, 1015B ′, 1015C ′, and 1015D ′ are provided on one long side portion (the right long side portion in FIG. 15) of the front side surface of the bobbin main body 1011 ′. It has been. The winding lead portion 1015A ′ has a depth from the outer peripheral side surface of the bobbin main body 1011 ′ to the bottom surface 1013B of the first concave groove 1013, and penetrates from the front side of the bobbin main body 1011 ′ to the first concave groove 1013. (See FIG. 17). The winding lead portions 1015B ′, 1015C ′, and 1015D ′ have a depth from the outer peripheral side surface of the bobbin main body 1011 ′ to a predetermined depth position of the second concave groove 1014, and from the front side of the bobbin main body 1011 ′. It is formed so as to penetrate to the second concave groove 1014.

  A winding lead portion 1015E ′ is provided at a position facing the winding lead portion 1015D ′ on the side surface on the back side of the bobbin main body 1011 ′, and a winding lead portion 1015F ′ is provided at a position facing the winding lead portion 1015C ′. A winding lead portion 1015G ′ is provided at a position facing the winding lead portion 1015B ′ (see FIG. 16). The winding lead portion 1015E ′ has a depth from the outer peripheral side surface of the bobbin main body 1011 ′ to the bottom surface 1013B of the first concave groove 1013, and penetrates from the front side of the bobbin main body 1011 ′ to the first concave groove 1013. (See FIG. 17). The winding lead portions 1015F ′ and 1015G ′ have a predetermined depth from the outer peripheral side surface of the bobbin main body 1011 ′ and are formed so as to penetrate from the front side of the bobbin main body 1011 ′ to the second concave groove 1014. .

  In order to increase the cooling effect of the primary coil 1 by the winding lead portions 1015A ′ to 1015G ′, the winding lead portions 1015B ′, 1015C ′, and 1015D ′ are arranged as shown by phantom lines (two-dotted lines) in FIG. The bobbin main body 1011 ′ may be formed so as to penetrate from the outer peripheral side surface of the bobbin main body 1011 ′ to the first concave groove 1013 and to penetrate from the front side of the bobbin main body 1011 ′ to the first concave groove 1013. Further, it has a depth from the outer peripheral side surface of the bobbin main body 1011 ′ to the first concave groove 1013 through the winding lead portions 1015F ′ and 1015G ′, and the front side of the bobbin main body 1011 ′. To the first groove 1013 may be formed.

In the second embodiment, the divided winding 1021a of the main winding 1021 and the two small windings 1022a and 1022b are wound in the first space of the concave groove 1012 ′ by the following procedure.
First, discrete winding 1021a of the primary winding 102, as shown in FIG. 19, a first groove the one lead wire _{L d1} 'from the bobbin main body 1011' winding draw-out portion 1015A in the state pulled out to the outside of the 1013 is wound from the inner wall surface 1013A side along a guide groove (not shown). The divided winding 1021a is folded back when it is wound up to the dividing wall 1018, and the original inner wall surface 1013A (using the depression between the windings formed on the upper side of the aligned divided winding 1021a as a guide is used. Winding to the inner wall surface having the winding lead portion 1015A ′.

After that, the divided winding 1021a is folded each time it reaches the dividing wall 1018 and the inner wall surface 1013A with a depression between the windings formed on the upper side of the divided windings 1021a of each layer wound as a guide. Is wound until a predetermined number of layers (even layers) is reached, and the other lead wire L _d2 is drawn out of the bobbin main body 1011 from the winding lead portion 1015B ′.

Next, Komaki line 1022a is divided winding from the inner wall surface 1014A of the second groove 1014 one of the lead wire _{L a1} 'from the bobbin main body 1011' winding draw-out portion 1015B with pulled out to the outside of 1021a Winding up to the dividing wall 1018 is performed using a recess between the windings formed on the upper surface of the wire as a guide.

  Next, the small winding 1022b has an inner wall surface 1014A (winding lead portion 1015C ′, winding recesses formed on the upper surface of the small winding 1022a from the dividing wall 1018 side of the second concave groove 1014 as a guide. The inner wall surface having 1015D ′).

One lead line L _b1 of the small winding 1022b is drawn out of the bobbin main body 1011 from the winding lead portion 1015D ′, and the other lead line L _b2 of the small winding 1022b is drawn from the dividing wall 1018. It is folded back to the portion 1015C ′ and pulled out to the outside of the bobbin main body 1011 as it is. The other lead wire _{L a2} of Komaki line 1022a, after being pulled out to the outermost layer in the dividing wall 1018, 'from the bobbin main body 1011' inner wall surface 1014A folded back side directly winding draw-out portion 1015C outside the Pulled out. That is, the other lead line L _a2 of the small winding 1022a and both lead lines L _b1 and L _b2 of the small winding 1022b pass through the outermost layer from the winding lead portion 1015C ′ and the winding lead portion 1015D ′ to the bobbin main body. It is pulled out of 1011 '.

  In the second space of the concave groove 1012 ', the divided winding 1021b and the small winding 1022c of the main winding 1021 are wound in the following procedure.

First, discrete winding 1021b, as shown in FIG. 19, the inner wall surface 1013A of the first groove 1013 to one of the lead wire _{L e1} 'from the bobbin main body 1011' winding draw-out portion 1015E in the state pulled out to the outside of the It is wound along a guide groove (not shown) from the side. Since the winding lead portion 1015E ′ is provided on the back side of the bobbin main body 1011, the winding direction of the divided winding 1021b in the second space is the winding direction of the divided winding 1021a in the first space. The opposite is true.

  The divided winding 1021b is folded back when it is wound up to the dividing wall 1018, and the original inner wall surface 1013A (using the depression between the windings formed on the upper side of the aligned divided winding 1021b is used as a guide. The inner wall surface having the winding lead portion 1015E ′ is wound.

  Thereafter, the divided winding 1021b is folded each time it reaches the dividing wall 1018 and the inner wall surface 1013A with a depression between the windings formed on the upper side of the divided windings 1021b of each layer as a guide. Is wound until a predetermined number of layers (an odd number of layers) is reached.

Next, Komaki line 1022c are divided winding from the inner wall surface 1014A of the second groove 1014 one of the lead wire _{L c1} 'from the bobbin main body 1011' winding draw-out portion 1015F in pulled out to the outside of 1021b Winding up to the dividing wall 1018 is performed using a recess between the windings formed on the upper surface of the wire as a guide. The other lead wire L _c2 of the small winding 1022c is folded back from the dividing wall 1018 to the winding lead portion 1015G ′ and is directly drawn out of the bobbin main body 1011 ′. The other lead wire _{L e2} discrete winding wirings 1021b, after being pulled out to the outermost layer is drawn 'from the bobbin main body 1011' inner wall surface 1014A folded back side directly winding draw-out portion 1015F outside the.

That is, both the lead line of the other and the lead wire _{L e2} Komaki line 1022c discrete winding wirings 1021b _{L c1, L c2} is winding draw-out portion 1015F 'winding draw-out portion 1015G' bobbin body from through the outermost It is pulled out of 1011 '.

In the insulation design between the layers of the coil part B, the aligned winding start position s of the first layer of the primary winding 102 connected to the primary bushing BS (+) and the aligned winding start position s of the second layer of the primary winding 102 are arranged. 13 is superimposed on the induced voltage difference in the steady state from the upper side position (position corresponding to the aligned winding end position e in FIG. 13) and the primary voltage v ₁ , and the primary voltage v ₁ oscillates transiently. The insulation design is performed in consideration of the vibration width at the time.

  In the first embodiment, the winding number adjustment winding 1022 is arranged at one end on the side connected to the primary bushing BS (+) of the primary winding 102, and three small turns of the winding number adjustment winding 1022. Since the wires 1022a, 1022b, and 1022c are arranged in the (2 × k) layers, the primary windings BS (+) are connected when the small windings 1022a, 1022b, and 1022c are arranged in two layers, respectively. The insulation condition between the first layer and the second layer of the small winding 1022a becomes the strictest.

When a lightning surge is superimposed on the primary voltage v ₁ due to a lightning strike, the maximum vibration width of the primary voltage v ₁ is approximately twice the uniform distribution voltage. For example, when the lightning surge is 60 kV (about 10 times the steady voltage), the voltage of 60 kV × 2 times / the total number of turns × the number of small turns [kV] is taken into consideration that the potential oscillation is amplified at a maximum of 2 times. Is induced between both ends of the small winding 1022a, so that it is instantaneously exposed to a voltage about 20 times that in the steady state.

  The number of turns of the small winding 1022a takes the above-mentioned voltage into consideration, and the induced voltage difference between the first and second layers of the small winding 1022a in a steady state is about 1/20 or less of the winding dielectric strength value. It is necessary to design under such insulation conditions. Therefore, in the first embodiment, the second concave groove 1014 is divided into two in the width direction by the dividing wall 1018, and the small windings 1022a, 1022b, and 1022c are aligned and wound in two layers, respectively. It is designed so that the induced voltage difference between the first and second layers of 1022a is about 1/20 or less of the winding dielectric strength value.

  The concept of the insulation design is the same in the second embodiment. In the second embodiment, since the split winding 1021a of the main winding 1021 is disposed on one end side of the primary winding 102, the first layer and the second layer of the split winding 1021a in the steady state are arranged. The induced voltage difference is designed to be about 1/20 or less of the winding dielectric strength value.

  The first layer of the divided winding 1021a is aligned and wound around the bottom surface 1012 of the first space of the groove 1012 (the bottom surface 1013B of the first groove 1013), and the number of turns is the first space of the groove 1012. The number of turns of the other layers wound in line is the smallest. Since the small winding 1022a and the small winding 1022b aligned and wound on the uppermost layer of the concave groove 1012 are larger than the number of turns in the first layer of the divided winding 1021a, in the second embodiment, the small winding It is designed so that a predetermined number of turns of 1022a and small winding 1022b are aligned and wound in one layer.

  In the first embodiment, each of the small windings 1022a, 1022b, and 1022c has four layers. In the second embodiment, each of the small windings 1022a, 1022b, and 1022c has one layer. Therefore, the depth of the second concave groove 1014 can be made shallower than in the case of the first embodiment.

  Since the small windings 1022b and 1022c are arranged in the outermost layer of the first space and the second space of the concave groove 1012 ′, and each small winding 1022a, 1022b and 1022c is a single layer winding, Pulling out both ends of the wires 1022a, 1022b, and 1022c from the outermost layer to the outside of the bobbin body 1011 ′ through winding lead portions 1015C ′, 1015D ′, 1015F ′, and 1015G ′ formed on the outer wall of the concave groove 1012 ′. it can. Therefore, it is possible to prevent the distortion of the cross-sectional shape of the primary coil 1 caused by drawing the winding in the middle of the lamination.

  In the first and second embodiments, the case where the winding number adjusting winding 1022 is configured by connecting the three small windings 1022a, 1022b, and 1022c in series has been described as an example. The number of small windings 1022 of 1022 is not limited to three, and may be one or four or more.

  In the first and second embodiments, an example in which only one dividing wall 1018 is provided has been described. However, the dividing wall 1018 is not limited to one, and two or more dividing walls 1018 are provided in parallel. The space of the concave grooves 1012 and 1012 ′ may be divided into three or more spaces in the width direction.

  In the first and second embodiments, the coil bobbin in the case where the primary winding 102 has the winding adjustment winding 1022 has been described. However, the primary winding 102 does not have the winding adjustment winding 1022. Even in this case, the present invention can be applied.

  When the primary winding 102 does not have the winding number adjusting winding 1022, for example, as shown in FIG. 20, the second groove 1014 of the groove 1012 is removed from the outer peripheral side surface of the first coil bobbin 101. A concave groove 1019 having a shape (substantially the same as the first concave groove 1013) may be provided, and one or more dividing walls 1018 may be provided vertically on the bottom surface 1019B of the concave groove 1019.

  FIG. 20A shows an example in which only one dividing wall 1018 is provided at the center of the bottom surface 1019B of the concave groove 1019. FIG. FIG. 20B is a view in which both inner wall surfaces 1019A of the groove 1019 are perpendicular to the bottom surface 1019B in FIG.

  In these cases, the split winding 1021a of the main winding 1021 described above is aligned and wound in a layered manner in the first space of the first concave groove 1013, and the split winding 1021b is the second of the first concave groove 1013. The primary winding 102 is divided into two in the same manner as the method of aligning and winding the layers in the space, one of them is aligned and wound in the first space of the concave groove 1019, and the other is the second of the concave grooves 1019. What is necessary is just to arrange and wind in layers in this space.

In the first embodiment, both lead lines L _d1 and L _d2 of the split winding 1021a and both lead lines L _e1 and L _e2 of the split winding 1021b are drawn outside the bobbin body 1011 and split with the split winding 1021a. The windings 1021b are connected in series, but a notch is provided at an appropriate position on the upper end of the dividing wall 1018, and the primary winding 102 is aligned and wound in layers from the bottom surface 1019B in the first space of the concave groove 1019. The position of the aligned winding may be moved from the notch to the bottom surface 1019B of the second space of the concave groove 1019 so that the aligned winding is layered in the second space.

  FIG. 20C is an example in which two dividing walls 1018 are provided on the bottom surface 1019B of the groove 1019 and the space of the groove 1019 is divided into three in FIG. In this example, a notch 1018 </ b> A is provided at an appropriate position at the upper end of the two dividing walls 1018.

  In this example, the primary winding 102 is aligned and wound in layers from the bottom surface 1019B in the first space of the concave groove 1019 (left space in FIG. 20C), and then from the notch 1018A of the left dividing wall 1018. The position of the aligned winding is moved to the bottom surface 1019B of the second space of the concave groove 1019 (the central space in FIG. 20 (c)), the aligned winding is layered in the second space, and the right dividing wall 1018 is further moved. The position of the aligned winding is moved from the notch 1018A to the bottom surface 1019B of the third space (the right space in FIG. 20C) of the concave groove 1019 so that the third space is aligned and wound in layers. do it.

  The transformers A1 and A2 shown in the first and second embodiments have a structure in which only one cylindrical iron core C is provided on one leg part of the coil part B. The structure which provided the cylindrical iron core C in the two leg parts of the coil part B may be sufficient. In this case, the winding lead portions 1015A to 1015F and 1015A ′ to 1015G ′ may be provided on the short side portion of the first coil bobbins 101 and 101 ′, and the winding lead portion 2013 is short to the second coil bobbin 201. What is necessary is just to provide in the part of a side.

  In the first and second embodiments, the coil part B used for the transformers A1 and A2 has been described. However, the present invention is not limited to the transformer, and uses a coil part having the same structure. It can be widely used for static induction equipment.

A1, A2 Transformer B Coil part C Iron core 1 Primary coil 101, 101 'First coil bobbin 1011, 1011' Bobbin body 1012, 1012 'Groove 1013 First groove 1013A Inner wall surface 1013B of the first groove Bottom surface of one groove 1014 Second groove 1014A Inner wall surface of first groove 1014B Bottom surface of second groove 1015A to 1015F Notch (winding lead-out portion)
1015A 'to 1015G' Notch (winding lead)
1016 1st guide groove 1017 2nd guide groove 1018 Dividing wall 1018A Notch 1019 Concave groove 1019B Bottom face 102 Primary winding 1021 Main winding (first winding)
1022 Winding adjustment winding (second winding)
1022a, 1022b, 1022c Small winding 2 Secondary coil 201 Second coil bobbin 2011 Bobbin main body 2012 Concave groove 2012A Inner wall surface 2012B Bottom surface 2013 Notch (winding lead-out portion)
2014 Guide groove 202 Secondary winding BS1 (+), BS1 (-) Primary bushing BS2 (+), BS2 (-), BS2 (G) Secondary bushing L _a1 , _{La 2} , L _b1 , L _b2 , L _c1 , L _c2 , L _d1 , L _d2 , L _e1 , L _e2 primary coil lead lines L _f1 , L _f2 , L _f3 secondary coil lead lines Q ₀ , Q ₁ , Q ₂ primary bushing relay terminals P _{1 to} P ₅ tap terminal P _c common terminal T ₀ through T ₅ connection point TL, TL 'tap changer TC switching piece

Claims (5)

The bobbin body,
A concave groove formed on the outer peripheral side surface of the bobbin body;
A coil bobbin in which a coil is manufactured by winding windings in layers in the concave groove,
The concave groove has a first concave groove having a predetermined cross-sectional shape, and a second concave groove having a predetermined cross-sectional shape formed in the bottom surface of the first concave groove,
One dividing wall is perpendicular to the bottom surface of the second groove so as to divide the second groove and the first groove into a first space and a second space in the width direction. Formed,
The winding has a main winding that constitutes a main part of the number of turns, and a winding adjustment coil that constitutes an adjustment part of the number of turns,
The side wall facing the first space of the second concave groove is provided with a first winding lead portion for pulling out both ends of the winding number adjustment winding from the bobbin body,
On both side walls of the first concave groove, second winding lead portions for pulling out both end portions of the main winding from the bobbin body are provided.
In the winding, after the winding adjustment winding is aligned and wound in layers in the first space of the second groove, the main winding is connected to the first space of the first groove and the first space. The main windings are aligned and wound in layers over two spaces, and are drawn from one end of the winding number adjustment winding drawn from the first winding lead and the second winding lead. Is connected in series via a tap terminal outside the bobbin body,
Both inner wall surfaces of the second groove are perpendicular to the bottom surface of the second groove,
A coil bobbin in which the width w in the first space of the second concave groove is set as shown by the following equation .
w = φ × n / (2 × k) + φ / 2
(Where, φ is the wire diameter of the winding, 2 × k is the number of layers of the winding adjustment winding (k is a positive integer), and n is the number of turns of the winding adjustment winding. )   The coil bobbin according to claim 1, wherein a guide groove for guiding a winding position of the winding is formed on a bottom surface of the concave groove. The winding number adjustment winding has a plurality of small windings connected in series with each other and having a smaller number of turns than the winding,
The first winding lead portion has a plurality of winding lead portions provided corresponding to each of the plurality of small windings,
The plurality of small windings are wound in layers in the second concave groove, and both end portions of each small winding are drawn from corresponding winding lead portions of the first winding lead portion, Connected in series via the tap terminal outside the bobbin body ,
The number of turns of each small winding is the same,
The coil bobbin according to claim 1 or 2 , wherein a width w of the second concave groove in the first space is set as represented by the following equation .
w = φ × n _s / (2 × k _s ) + φ / 2
(In the formula, 2 × k _s is the number of layers of the small winding (k _s is a positive integer), and n _s is the number of turns of the small winding.) A coil used in a stationary induction device,
A coil, wherein the coil bobbin according to any one of claims 1 to 3 is formed by winding a winding in a layered manner in the groove of the coil bobbin. A transformer comprising the coil according to claim 4 as a primary coil.

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