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

Stator winding of double-pole three-phase induction motor Download PDF

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Publication number
RU2046515C1
RU2046515C1 SU5012502A RU2046515C1 RU 2046515 C1 RU2046515 C1 RU 2046515C1 SU 5012502 A SU5012502 A SU 5012502A RU 2046515 C1 RU2046515 C1 RU 2046515C1
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Russia
Prior art keywords
winding
windings
pole
star
stator winding
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Russian (ru)
Inventor
В.Г. Власов
Н.М. Морозов
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Научно-исследовательский, проектно-конструкторский и технологический институт Научно-производственного объединения "Кузбассэлектромотор"
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Priority to SU5012502 priority Critical patent/RU2046515C1/en
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Publication of RU2046515C1 publication Critical patent/RU2046515C1/en

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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.
Known methods for the manufacture of two-layer windings, which are performed with a shortened pitch. Shortening is determined by the coefficient
β
Figure 00000003
where y is the step of the winding, measured by the number of groove divisions;
τ pole division.
At 2p 4, the step shortening is chosen close to β
Figure 00000004
and depending on the number of grooves z is taken equal in accordance with table. 1.
At 2p 2, the shortening of the step is recommended to take β
Figure 00000005
0.666 and depending on the number of grooves z is taken equal in accordance with table. 2.
The disadvantage of this method of manufacturing stator windings of bipolar machines with shortening β
Figure 00000006
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
Figure 00000007
<
Figure 00000008
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.
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 ≪
Figure 00000009
(namely, depending on the number of stator grooves within
Figure 00000010
0.388 to
Figure 00000011
0.416), the ratio of the number of turns of the windings of the triangles W Δ and the star W
Figure 00000012
taken equal
Figure 00000013
Figure 00000014
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 <
Figure 00000015
.
For the considered example (Fig. 2 and 3) at z 48, the shortening factor
β
Figure 00000016
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
Figure 00000017
Figure 00000018
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.
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
Figure 00000019
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)

  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
    Figure 00000020
    are equal
    Figure 00000021
    and the beginning of the same phases of both windings are displaced in space by 30 el. hail. relative to each other.
SU5012502 1991-07-22 1991-07-22 Stator winding of double-pole three-phase induction motor RU2046515C1 (en)

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SU5012502 RU2046515C1 (en) 1991-07-22 1991-07-22 Stator winding of double-pole three-phase induction motor

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SU5012502 RU2046515C1 (en) 1991-07-22 1991-07-22 Stator winding of double-pole three-phase induction motor

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2562795C2 (en) * 2013-06-17 2015-09-10 Общество с ограниченной ответственностью "АС и ПП" WINDING OF DOUBLE-POLE THREE-PHASE ELECTRIC MACHINE FOR z=18
RU2624734C1 (en) * 2016-05-04 2017-07-06 Федеральное Государственное Бюджетное Научное Учреждение "Аграрный Научный Центр "Донской" Asynchronous motor start-up method
RU200394U1 (en) * 2020-07-16 2020-10-22 Акционерное общество "Чебоксарский электроаппаратный завод" VAN ELECTRIC MOTOR

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Обмоточные данные асинхронных двигателей. /Под ред. П.И.Цибульского. М.: Энергия, 1971, с.385, рис.3-153. *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2562795C2 (en) * 2013-06-17 2015-09-10 Общество с ограниченной ответственностью "АС и ПП" WINDING OF DOUBLE-POLE THREE-PHASE ELECTRIC MACHINE FOR z=18
RU2624734C1 (en) * 2016-05-04 2017-07-06 Федеральное Государственное Бюджетное Научное Учреждение "Аграрный Научный Центр "Донской" Asynchronous motor start-up method
RU200394U1 (en) * 2020-07-16 2020-10-22 Акционерное общество "Чебоксарский электроаппаратный завод" VAN ELECTRIC MOTOR

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