SU1297176A1 - Three-phase pole-changeable winding - Google Patents

Abstract

The invention relates to electric machines and can be used in asynchronous electric motors with a squirrel cage with stepped angular velocity control by switching the number of pole pairs of the stator winding. The purpose of this proposal is to expand the scope. The winding consists of nine parts and is switched by means of two three-pole n to switches. The winding is made of eighteen coil groups, which are connected in series according to nine winding parts so that coil groups 1.4 enter into part 411, coil groups 2.5 enter into part 412, coil groups 3.6 enter into part 413, coil groups 8.11 enter into part 422, coil groups 9.12 in turn into part 423, coil groups 7.10 enter into part 421, coil groups 15.18 enter into part 433, coil groups 13,16 are included in part 431, the coil groups 14,17 are included in part 432. Three-layer switches are connected in series but three parts of the winding in each phase so that when R-1, parts 411, 412, 413 enter phase A, parts 421, 422, 423 enter phase B, parts 431, 432, 433 enter phase C, when R-6, parts 411, 421, 431 enter phase A, parts 422, 432, 412 enter phase B, parts 413, 423, 433 enter phase C. The winding provides a rotating magnetic field with 1 and 6 pairs of poles. 4 il. 412 (L y vj Cfi fXr f.ff) 42

Description

112

The invention relates to electrical machines and can be used in electrical engineering to create two-speed asynchronous motors.

11 of the invention is an extension of the field of application of a winding,

FIG. 1 shows a circuit diagram of a winding with, and FIG. 2 and 3 are vector diagrams of a slot EMF of a winding consisting of 18 coils in FIG. 4 - a schematic scan of the winding with,,.

Through 411, 412, 413, 421, 422, 423, 431, 432, 433 nine winding parts are designated, and through P Pole switches, by means of which the number of pole pairs is switched. The top position of the switches, designated P, corresponds to the inclusion of a winding for 1 pair of poles, and the lower one,

P - three

Nomu P, - turning on winding for 6 pairs

poles, in parentheses are the numbers of coil groups of CG, which are part of the corresponding parts of the winding.

The vector diagrams shown in FIG. 2 refer to a diagram with 1 pair of poles 5 and in FIG. 3 to a diagram with 6 pairs of poles. Items 1-18 in FIG. 2 and 3 denote cat-jneK numbers, to which the corresponding EMF vectors belong. One, two and three strokes in FIG. Figures 2 and 3 show the emf coil vectors included in phases A, B, and C, respectively.

From FIG. 2 and 3 it can be seen that the proposed winding with both numbers of pairs of poles is symmetrical, intact and does not create the lower harmonics of the GVA.

In the diagram of the proposed winding (figure 4), the letters H and K mark the beginning and end of nine corresponding parts.

A three-phase pole-switched winding for 1 and 6 pairs of poles is double-layered with an integer number of coils per phase zone of width 2 / / 3 electric radians, connected in a star for both numbers of pairs of poles, consists of identical uniformly distributed coils connected in nine parts, and two three-pole switches, each of which has three groups of conclusions, three terminals in each group - upper, middle and lower, and in each group closes one circuit

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five

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between the middle and upper (at) or between the middle and lower (at) terminals, with the beginning of parts with numbers 411, 422 and 433 connected to the external terminals of winding A, B and C, respectively, and their ends with the first, second and third upper the pins of the first switch, the beginning of the parts of numbers 412, 423, 431 are connected to the first, second and third middle pins of the first switch,

and their ends - with the first, second and second upper pins of the second switch, the beginning of parts 413, 421 and 432 are connected to the first, second and third middle pins of the second switch, and their ends are interconnected, besides, the switches are provided with jumpers, connecting the first lower with the second upper, the second lower with the third upper and the third lower with the first upper pins of each switch, the winding is made of 18 coil groups of S consecutive coils (2,3, ...), and coil groups with numbers 1.4 the keys are consistently consistent with part 411, coil groups numbered 2.5 are included consistently according to part 412, coil groups numbered 3.6 are connected sequentially according to part 413, coil groups numbered 8, 11 are connected in series in accordance with the part with number 422, coil groups t with numbers 9,12 are included in series in accordance with part with number 423, coil groups with numbers 10 and 10 are connected in series with according to part with number 421, coil groups with numbers 15 , 18 included after conformance-according to the part with the number 433, coil groups with numbers 13, 16 are included in series-according to the part with number 431, coil groups with numbers 14,17 are included in series-according to part with the number 432.

Winding works as follows.

When switches P1 and P2 are set to the position indicated by P, the circuits between the upper and middle contacts of the switches are closed and the coil groups are distributed in the following way: 1,4,2,5,3,6

312

enter phase L, 8,11,9, 12, 7,10 - into phase B, 15,18,13,16,14,17 - into phase C When switched into a three-phase network, such winding creates a field with one pair of poles . When switches 01 and P2 are set to position P, the short-circuit between the lower and middle contacts of the switches and the coil groups are phased out as follows: 1,4,13,16,7,10 enter phase A, 8,11 , 2,5,14,17 - in phase B, 15,18,9,12,3,6 - in phase C. When switched on in a three-phase network, such a winding creates a field with 6 pairs of poles. The winding coefficient at is K, 0.819, at -0.866, the coefficients being shortened at and K y, 0.985 and 0.866, respectively, and the distribution coefficients at and P 6 KJJ, 0.831 and K 1, respectively. Thus, the proposed device, when connected to a three-phase network, provides a rotating magnetic field with 1 and 6 pairs of poles, allows to expand the range of the pole-switched winding consisting of nine parts and two-pole: three-pole switches

on bccccccc) with a crust engine with corresponding HomsHi-ieM speeds 1: 6.

Claims (1)

Invention Formula A three-phase pole-switching winding is two-layer with a target number of coils per phase zone with a width of 23T / 3 electrical radians, connected to a star for both numbers of pole pairs, consisting of identical evenly distributed coils connected in nine parts with 411, 422, 433, 412, 423, 431, 413, 421, 432, and two three-pole switches, each of which has three groups of terminals with three terminals in each group - upper, middle and lower, and closes one circuit in each group between middle and upper (at,) or between middle and lower (at P-Pa ,,) 71 5 / g 0 five ,, 0 76l pins, with the beginning of parts numbered 411, 422, and 433 are connected to external pins 1 of windings A, B and C, respectively, and their ends with the first, second and third upper pins of the first: zog switch, and the beginning of parts numbered 412,423,431 the second and third middle pins of the first switch, and their ends with the first, second and third upper pins of the second switch, the beginning of parts 413,421,432 are connected to the first, second and third middle pins of the second switch, and their ends are interconnected; switch The switches are equipped with jumpers connecting the first lower to the second upper, the second lower to the third upper and the third lower to the first upper pins of each switch, which means that in order to expand the field of application by obtaining the ratio of the number of pairs of poles 1 6, it is made of 18 coil groups of S in series according to the included coils, the coil groups with numbers 1,4 are connected in series with the part number 411, coil groups with numbers 2.5 are connected in series with according to Ome 412, coil groups with numbers 3.6 are included in series according to the part with number 413, coil groups with numbers 8.11 are connected in series with according to part with number 422, coil groups with numbers 9.12 are included in series with according to with number 423, coil groups with numbers 7,10 are included in series according to the part with number 421, coil groups with numbers 15,18 are included in series with according to part with number 433, coil groups with numbers 13,16 are connected in series part with number 431, cat ear groups with numbers 14,17 are included consistently in accordance with the part with number 432, where S is a natural number. 13 12 10 9 , 7.7 (7 7J, 7512, 15.18 M / Y / 4, 77 Z FIG 3   S2 C 5 b li . - 5 R 5 3 РЗг; : 15 I $ Editor A. Lezhnin Compiled by A. Ketsaris Tehred L. Kravchuk Order 791/58 Circulation 661 - Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production polygraphic enterprise, Uzhgorod, st. Project, 4   5 R 5 3 P3h; 15 I $ "M g ea: Fi9. ft Proofreader A. Obruchar