RU2123226C1 - End portion of single-turn coil of electrical- machine double-layer winding - Google Patents

Abstract

FIELD: electrical engineering; electromechanical engineering. SUBSTANCE: non-transposed end portion of single- turn coil of electrical-machine double-layer winding is proposed to be made of separate conductor of transposed Rebel bar confined within transposition region of (90 + 45) deg. from line of conductor bend in center of transition from column to column. Process of insulating end portions with tape and their tight placement for adjacent single-turn coils can be mechanized. The invention can be likewise used for equalizing connections of electrical-machine windings. EFFECT: reduced mass and size of machine, facilitated manufacture. 7 dwg

Description

 The invention relates to the field of electrical engineering and electrical engineering and can be used in the manufacture of windings of electrical machines.

 Known single-turn coil of a rigid two-layer winding of the armature [1, 4], made of a drive of rectangular cross section and containing a frontal frontal part sequentially connected by transition curves with a transposition of conductors in the frontal head, grooved parts and lead ends, in which the frontal part consists of two shoulders and the head of the frontal part, made in the form of a circular ring located in a plane passing through the longitudinal axis of the machine and the bisector of the Central angle between the groove parts of the coil, and the head l Both parts are connected to the shoulders of the frontal part by transition curves, and the conductors in the head of the frontal part are curved “on the edge”.

 The prior art also knows the concentration of leveling compounds of the first kind, located on the side of the collector in cylindrical planes that bend along the same curves as the front frontal part of the above-described coils [2, 3].

 Common signs of the design of the frontal part of the considered coil and the claimed technical solution are the implementation of the coil from a rectangular wire and the presence of the frontal frontal part of two shoulders and the head of the frontal part, in which the transition from layer to layer is connected by transition curves with shoulders.

 The disadvantages of the design of the coil [1] and leveling joints [2] are unsatisfactory weight and size indicators due to the large axial outreach of the frontal part and the considerable length of the wire in it, due to the presence of a transition from layer to layer as part of a circular ring, as well as the impossibility of mechanically applying tape insulation to the surface of the head of the frontal part of the coil due to the complex spatial contour of the head of the frontal part.

The known design of a single-turn coil and equalizing connections for the windings of electrical machines [5], which are made of rectangular wire. The head of the frontal part of such a coil is made in the form of a bent "on the edge" wire of rectangular cross section at an angle corresponding to the angular pitch of the winding, and the shoulders of the frontal part are curved helically in mutually opposite directions by 90 ^° . In the frontal part of such a coil, the transition from layer to layer and the transposition of the conductors are carried out in the area bounded by the head of the frontal part and two segments of the shoulders of the frontal part, on which the wire section is rotated 90 ^° .

 Common signs of the frontal part of the considered coil and the claimed technical solution are the execution of the coil from a rectangular wire, the presence of the frontal part of two shoulders and the head of the frontal part and the transition from layer to layer in the frontal part of the coil.

The disadvantages of the design of the frontal part of the coil [5] are unsatisfactory weight and size indicators due to the increased axial extension of the head of the frontal part caused by the bending of the wire in it “by the rib”, the greater the higher the ratio of the width of the wire to its thickness and the increased angle of inclination of the shoulders of the frontal part -for the presence of segments of the shoulders, where the section is rotated by 90 ^o , which does not allow to lay the shoulders of the frontal part of adjacent coils close to each other. Closest to the claimed technical solution is the design of the frontal part of the coil [6], which represents a single-turn section of a rectangular wire. The head of the frontal part of this coil is made in the form of a bend of the wire around the longitudinal axis of the wire section (onto the plane), and the shoulders are made in the form of two multidirectional bends around the transverse axis of the section of the wire ("on the edge"), while maintaining the position of the wire surfaces relative to the wire contour , i.e. without transposition of the wire in the frontal part of the coil.

 Common features of the design of the frontal part of this coil and the claimed technical solution are the execution of the coil from a rectangular wire, the presence of the frontal part of two shoulders and the head of the frontal part, and the wire in the head of the frontal part is bent to a plane, and the surface of the wire in the frontal part does not change their position with respect to the coil loop, i.e. no transposition.

 The design disadvantage of the frontal part of the coil [6] is the presence of bends of the shoulders of the frontal part, as a result of which it is impossible to tightly fit the shoulders of the frontal parts of adjacent coils, which in some cases is necessary, for example, when laying leveling joints to reduce the dimensions of the armature or to increase the mechanical strength of the frontal parts by gluing them or pouring them with an epoxy compound [3, p. 191].

 The objective of the invention is to improve overall dimensions, improve manufacturability by providing further design of the possibility of mechanized imposition of tape insulation in the frontal parts, the implementation of tight packing of the shoulders of the frontal parts of adjacent single-turn coils of the windings of electric machines.

The essence of the invention lies in the fact that the frontal part of a single-turn coil of two-layer windings of electric machines, containing two shoulders and a head, according to the invention is made of a separate wire of the transposed Rebel rod, limited by the transposition zone ± (90 ^o + 45 ^o ) from the bend of the plane of the wire in the middle transition from column to column.

The invention is illustrated by drawings. In FIG. 1 shows in two projections the design of the groove part of the transposed Rebel rod of the core winding of electrical machines according to [3, p. 186, Fig. 7-15]; in FIG. 2 - two projections of a separate wire 1 in FIG. 1 Rebel rod; in FIG. 3 - two projections of the design of a single-turn double-layer coil of the windings of electric machines with a non-transposed frontal part 5; 7; 5; representing the construction of a separate wire of the Rebel rod limited by the transposition zone ± (90 ^° + 45 ^° ) from the bending line 1 ′ - 1 of the plane of the wire in FIG. 2; in FIG. 4 - two projections of a linear electric machine or a reamer onto the plane of a cylindrical electric machine with single-turn coils of a two-layer winding with frontal parts in the form of a construction of a separate wire of the Rebel rod, limited by the transposition zone ± (90 ^o + 45 ^o ) from the bend line of the passage to the plane; in FIG. 5 is a section BB of the groove portion of the electric machine of FIG. 4; in FIG. 6 is an end view of the frontal parts of the cylindrical armature of an electric machine with such coils.

от линии 2' - 2 изгиба его на плоскость;
3 - отдельный провод стержня Ребеля с зоной транспозиции

от линии 3' - 3 изгиба его на плоскость;
5 - зона транспозиции провода 1 стержня Ребеля, где осуществляется переход провода из одного столбика в другой [7, стр. 153], или головка лобовой части катушки заявляемого технического решения, в которой осуществляется переход провода из слоя в слой двухслойной обмотки;
6 - зона транспозиции провода 1 стержня Ребеля, где осуществляется переход провода из одного столбика в другой;
7 - наклонно располагаемая в пазу электрической машины часть отдельного провода стержня Ребеля или плечо лобовой части катушки заявляемого технического решения с углом наклона, соответствующим угловому шагу обмотки;
8 - пазовая часть катушки обмоток электрических машин;
9 - шихтованный сердечник электрической машины;
10 - вал якоря электрической машины;
11 - сердечник якоря;
12 - обмоткодержатель лобовых частей.In FIG. 1 to 6 numbers indicate:
1 - a separate wire of the Rebel rod with the transposition zone ± (90 ^o + 45 ^o ) from the line 1 '- 1 bend on its plane;
2 - a separate wire of the Rebel rod with a transposition zone

from line 2 '- 2 bending it to a plane;
3 - a separate wire of the Rebel rod with a transposition zone

from the line 3 '- 3 bending it to the plane;
5 - zone of transposition of wire 1 of the Rebel rod, where the wire is transferred from one column to another [7, p. 153], or the head of the frontal part of the coil of the claimed technical solution, in which the wire is transferred from layer to layer of a two-layer winding;
6 - transposition zone of wire 1 of the Rebel rod, where the wire is transferred from one column to another;
7 - a part of a separate wire of a Rebel rod inclined in a groove of an electric machine or a shoulder of a frontal part of a coil of the claimed technical solution with an angle corresponding to the angular pitch of the winding;
8 - groove part of the coil of the windings of electrical machines;
9 - burdened core of an electric machine;
10 - armature shaft of an electric machine;
11 - core of the anchor;
12 - winding holder of the frontal parts.

и соответственно разные длины наклонных частей 7. Для применения конструкции отдельного провода транспонированного стержня Ребеля, ограниченного зоной транспозиции ± (90^o + 45^o) от линии изгиба плоскости провода в середине перехода из столбика в столбик, в качестве конструкции нетранспонированной лобовой части одновитковой катушки и уравнительного соединения двухслойных обмоток электрических машин используются следующие его свойства:
свойство перехода из столбика в столбик, обеспечиваемое изгибом провода на ребро под углом 30 - 45^o и одновременным изгибом провода на ребро под углом 30 - 45^o и одновременным изгибом на плоскость в середине перехода под углом, соответствующим углу наклона по высоте стержня в качестве свойства перехода провода лобовой части катушки из слоя в слой двухслойной обмотки электрических машин;
свойство наклонного расположения отдельного провода стержня в пазу в зоне транспозиции ± (90^o + 45^o) - в качестве угла наклона плеча лобовой части катушки согласно [9, стр. 56], при этом зона 5 (фиг. 2, 3) транспозиции 90^o, где происходит изгиб провода на ребро под углом (30 - 45^o) и переход из столбика в столбик, соответствует головкe лобовой части катушки, в такой головке переход провода катушки из слоя в слой обмотки происходит при сохранении положения поверхностей провода по отношению к контуру провода катушки, т.е. без транспозиции, как описано в [6];
шаг плетения t отдельных проводов в стержне соответствует зубцовому делению сердечника ([9], фиг. 4);
шаг y (фиг. 4) катушки по пазам с такой лобовой частью соответствует зоне транспозиции ± (90^o + 45^o) отдельного провода стержня Ребеля.Known design rod rod winding turbogenerators and hydrogenerators [3, p. 185-191]; [7, p. 153-155], in which the total cross section of the rod is divided into separate wires of small cross section with transposition of wires only in the groove part of the machine or in the groove and frontal parts. This design was named Rebel. The Rebel rod (Fig. 1) is a set of copper wires 1; 2; 3 etc. rectangular section located in two vertical columns. In the initial, non-transposed part of the rod, all individual wires are parallel to the axis of the rod and to each other. At the beginning of the transposition zone, to the left of the axis 1 - 1 '(Fig. 1), wire 1 is bent "to the edge" at an angle of 30 - 45 ^o to the axis of the rod, as described in [8, p. 123-125], goes to another column rod; at the same time it bends in the middle of the transition relative to the axis 1 - 1 'to the plane and obliquely descends down the rod to the axis 1' - 1. Through the distance t (Fig. 1), wire 2 (axis 2 - 2 ') rises to its place in the upper part of the rod . The distance t is called the “weaving step” [7, p. 153-154]. In the region of the axis 1 '- 1, the lead 1 is again bent to an edge and to a plane and, thus, returns to the first column and, gradually rising at an angle upward from the rod, takes its initial position. Therefore, a separate wire 1 in the transposition zone 360 ^o makes one complete revolution around the axis of the rod. All other conductors are intertwined in the same way. The design of the individual wire 1 is shown in FIG. 2. It should be noted that wire 1 in FIG. 2 will have inclined parts 7 symmetrical in length relative to the axis of its bend to the plane 1 - 1 within the transposition zone ± (90 ^o + 45 ^o ), and each underlying separate wire 2, 3, etc. - not symmetrical, but with a shift by an angle α ^° corresponding to the weaving step. So, for example, the passage 2 (Fig. 1) will have a transposition zone of the inclined parts 7 (Fig. 2) relative to the bend axis 2 '- 2 (Fig. 1) to the plane

and, accordingly, different lengths of the inclined parts 7. To use the design of a separate wire of the transposed Rebel rod, limited by the transposition zone ± (90 ^o + 45 ^o ) from the bending line of the plane of the wire in the middle of the transition from column to column, as a design of the non-transposed frontal part of a single-turn coil and equalizing connection of two-layer windings of electrical machines uses the following properties:
the property of transition from column to column, provided by bending the wire to the edge at an angle of 30 - 45 ^o and simultaneously bending the wire to the edge at an angle of 30 - 45 ^o and simultaneously bending to the plane in the middle of the transition at an angle corresponding to the angle of inclination along the height of the rod as a property the transition of the wire of the frontal part of the coil from layer to layer of a two-layer winding of electrical machines;
the property of the inclined arrangement of a separate wire of the rod in the groove in the transposition zone ± (90 ^o + 45 ^o ) - as the angle of inclination of the shoulder of the frontal part of the coil according to [9, p. 56], while zone 5 (Fig. 2, 3) of the transposition 90 ^o , where the wire bends to the rib at an angle of (30 - 45 ^o ) and the transition from column to column corresponds to the head of the frontal part of the coil, in such a head the coil wire transitions from layer to winding layer while maintaining the position of the wire surfaces relative to the contour coil wires, i.e. without transposition, as described in [6];
the weaving step t of the individual wires in the rod corresponds to the tooth division of the core ([9], Fig. 4);
step y (Fig. 4) of the coil along the grooves with such a frontal part corresponds to the transposition zone ± (90 ^o + 45 ^o ) of a separate wire of the Rebel rod.

 For the formation of a single-turn coil with such a frontal part, it is sufficient to pair the shoulders of the frontal part 7 (Figs. 2, 3, 4) with the groove parts 8, as shown in FIG. 4, and the groove parts should be perpendicular to the longitudinal axis of the Rebel rod.

To form the winding of an electric machine, single-coil coils of a two-layer winding with frontal parts are laid in the grooves of the core 9 (Fig. 4), the design of which corresponds to the design of a separate wire of the transposed Rebel rod, limited by the transposition zone ± (90 ^o + 45 ^o ) from the bend line in the middle of the transition from column to column of the plane of the wire. When laying the coils, a two-layer weaving of the frontal parts is formed, similar to the two columns of the Rebel rod. However, unlike the Rebel rod, all the frontal parts of the 7 coils are the same, while in the Rebel rods each individual wire has its own transposition zone from the line of bending of the wire to the plane, depending on the position of the wire along the height of the rod to the beginning of the transposition zone. When stacking coils in the cylindrical core of the armature, as shown in FIG. 6, the shoulders 7 (Fig. 4) should be bent in the same way as the rebel conductors are bent when manufacturing transposed frontal parts of the barrel winding along the radius R1 [3, p. 189, Fig. 7-20] and as shown in FIG. 6.

Thus, the use of the well-known design of a separate wire of the transposed Rebel rod, limited by the transposition zone ± (90 ^o + 45 ^o ) from the bending line of the plane of the wires in the middle of the transition from column to column, as a design of the frontal part (or equalization connections) of two-layer windings of electric machines made possible by the relationship between the properties of individual wires of the transposed Rebel rod and the non-transposed frontal part of the coil, which allows the formation of uhsloynye windings of electrical machines at stacking coils in the core or at stacking equalization compounds bilayer windings of electrical machines. The use of such coils and equalizing connections allows tight packing without gaps between the shoulders 7 of the frontal parts of the coils, similar to how separate wires 1 lie; 2; 3 etc. Rebel’s rod (Fig. 1), which ultimately reduces the length of the frontal part, its extension, and the transition of the wire from layer to layer in the head of the frontal part of the coil by double bending the passage to the rib at an angle of 30 - 45 ^o and to the plane in the middle of this transition at an angle corresponding to the angle of inclination of the shoulders of the frontal part without the formation of a transitional loop, as in the coil according to [1, 4], as well as limiting the transition zone by the head of the frontal part, further reduces the overhang of the frontal part of the coil and leveling joints, which reduces the length of the electric mechanical machines, and also after impregnation and gluing, to obtain a mechanically sound construction of the frontal part or equalizing joints of electric machines.

Claims (1)

The frontal part of a single-turn coil of two-layer windings of electric machines, containing two shoulders and a head, characterized in that it is made of a separate wire of the transported Rebel rod, limited by the transposition zone ± (90 ^o +45 ^o ) from the bend of the plane of the wire in the middle of the transition from column to column .

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