RU2046515C1 - Stator winding of double-pole three-phase induction motor - Google Patents

Abstract

FIELD: electric motors. SUBSTANCE: motor stator winding in built up of two three-phase windings connected, respectively, in star and in delta; winding pitch of both is shortened between 0.388 and 0.416 depending on number of stator poles; proportion of delta- and star-connected winding turns is taken as

Description

 The invention relates to electrical engineering and can be used in the electrical industry in the manufacture of stator windings of bipolar induction motors.

где y шаг обмотки, измеряемый числом пазовых делений;
τ полюсное деление.Known methods for the manufacture of two-layer windings, which are performed with a shortened pitch. Shortening is determined by the coefficient
β

where y is the step of the winding, measured by the number of groove divisions;
τ pole division.

и в зависимости от числа пазов z принимается равным в соответствии с табл. 1.At 2p 4, the step shortening is chosen close to β

and depending on the number of grooves z is taken equal in accordance with table. 1.

0,666 и в зависимости от числа пазов z принимается равным в соответствии с табл. 2.At 2p 2, the shortening of the step is recommended to take β

0.666 and depending on the number of grooves z is taken equal in accordance with table. 2.

заключается главным образом в сложности укладки лобовых частей из-за их большой длины, что является причиной отсутствия оборудования для механизированной намотки статоров двухполюсных машин. Более существенное укорочение шага обмотки

<

для двухполюсных машин не применяется, так как при этом резко возрастают высшие гармоники потока статора, вследствие чего в механической характеристике электродвигателя появляются большие провалы момента.The disadvantage of this method of manufacturing stator windings of bipolar machines with shortening β

lies mainly in the difficulty of laying the frontal parts due to their large length, which is the reason for the lack of equipment for mechanized winding of stators of bipolar machines. More substantial winding pitch shortening

<

it is not used for bipolar machines, since in this case the higher harmonics of the stator flux sharply increase, as a result of which large moment dips appear in the mechanical characteristics of the electric motor.

 In addition, there are known methods of manufacturing two-speed pole-switched windings with a speed ratio of 1: 2, in which each phase is divided into two equal parts depending on the conjugation of these parts (triangular double star, double star or double triangle), and therefore changes in the direction of the current in one of the parts of the winding can provide a different number of poles in a ratio of 1: 2. An example of the winding of an induction motor with the number of slots z 24 and the ratio of the number of poles 1: 2 is given in the book. Winding data of induction motors. / Ed. P.I. Tsibulsky. M. Energy, 1971, p. 385, fig. 3,153.

 The prototype solves the problem of obtaining two-speed windings, including 2p 2/4, but the creation of a two-pole machine is not ensured.

 The aim of the invention is to simplify bipolar asynchronous machines by using magnetic cores (stator cores) and stamping and winding automated technological equipment and the most popular four-pole asynchronous machines.

(а именно в зависимости от числа пазов статора в пределах

0,388 до

0,416), соотношение чисел витков обмоток треугольников W_Δ и звезды W

принимают равными

а начала одноименных фаз обмоток А и А₁, В и В₁, С и С1 смешают в пространстве относительно друг друга на 30 эл. град.The goal is that the stator winding with the number of pairs of poles 2p 2 is made of two three-phase windings A, B, C and A ₁ , B ₁ , C ₁ connected respectively in a triangle and a star, while the shortening factor of the pitch of both windings take β ≪

(namely, depending on the number of stator grooves within

0.388 to

0.416), the ratio of the number of turns of the windings of the triangles W _Δ and the star W

taken equal

and the beginning of the same phases of the windings A and A ₁ , B and B ₁ , C and C1 are mixed in space relative to each other by 30 el. hail.

 In FIG. 1 and 4 show the location of the coil groups in both parts of the winding and the connection of both parts to each other; in FIG. 2 and 3, the arrangement of coils and coil groups in the grooves of the stator with the number of grooves z 48 connected respectively in a triangle (Fig. 2) and a star (Fig. 3).

.The proposed winding of a three-phase asynchronous motor is implemented as follows. For winding a bipolar machine, both the packages themselves are used, as well as modern technological systems and winding equipment from four-pole machines. The stator winding is made of coil groups connected in two parts: the first is connected in a triangle, the second in a star, with a shortening of the step β <

.

0,416, т.е. фактически шаг в пазовых делениях равен величине шага четырехполюсной машины. Число витков в катушках, а следовательно, в фазах выбирает ся в соотношении

1,73. Соотношение сечений и диаметров обмоточных проводов выбирают исходя из этого соотношения числа витков, тем самым обеспечивая требуемый коэффициент заполнения паза. Начала одноименных фаз в частях обмотки, соединенных в треугольник и звезду, смещаются относительно друг друга на 30 эл. град.For the considered example (Fig. 2 and 3) at z 48, the shortening factor
β

0.416, i.e. in fact, the pitch in the groove divisions is equal to the pitch of the four-pole machine. The number of turns in the coils, and therefore in phases, is selected in the ratio

1.73. The ratio of the cross-sections and diameters of the winding wires is selected based on this ratio of the number of turns, thereby ensuring the required groove fill factor. The beginnings of the phases of the same name in parts of the winding connected in a triangle and a star are displaced relative to each other by 30 el. hail.

т.е. фактически соответствующим четырехполюсной машине, а именно y 1 11. Начала фазы А₁О₁ по отношению к фазе АХ и соответственно фаз В₁О₁к ВУ и С₁О₃ к CZ должны быть смещены на четыре пазовых деления, т.е. на 30 эл. град. Соединение обеих частей обмотки выполняется в соответствии с фиг. 1, а три выводных конца для подсоединения к сети подключают к трем точкам вершинам треугольника.PRI me R. The stator winding at z 48 is performed by winding sequentially from two parts connected in a triangle and a star with a shortened pitch β

those. actually corresponding to a four-pole machine, namely, y 1 11. The beginnings of phase A ₁ O ₁ with respect to phase AX and, accordingly, phases B ₁ O ₁ to WU and C ₁ O ₃ to CZ should be shifted by four groove divisions, i.e. 30 email hail. The connection of both parts of the winding is carried out in accordance with FIG. 1, and the three output ends for connecting to the network are connected to three points by the vertices of the triangle.

 The connection of both parts of the winding can be performed in a sequential circuit (Fig. 4).

 The proposed technical solution allows to simplify the manufacturing process of bipolar machines, to use the equipment of four-pole machines as the most popular for the manufacture of bipolar machines with sufficiently high operating and starting characteristics of an asynchronous machine.

Claims (1)

STATOR WINDING OF A TWO-POLE THREE-PHASE ASYNCHRONOUS MOTOR made of two three-phase windings, characterized in that the windings are connected one into a triangle and the other into a star, while the step shortening factor is adopted from 0.388 to 0.416 for both windings depending on the number of grooves turns of the windings of the triangle W _Δ and stars

are equal

and the beginning of the same phases of both windings are displaced in space by 30 el. hail. relative to each other.

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