RU2181921C1 - Six-to-four pole changing winding - Google Patents

Abstract

FIELD: electrical engineering; electrical machines. SUBSTANCE: proposed winding may be found useful for designing dual-speed motors in which number of stator slots is a multiple of 36. Winding has 18 coil groups , number of coils in groups alternating as follows: 2K, 3K, 2K, 2K, 3K, 2K, 1K, 1K, 2K, 3K, 2K, 2K, 2K, 3K, 2K, 1K, 1K, where K is positive integer number. Finishing lead 1 of coil group is connected to coil-group finishing lead 4, starting lead 4, to starting lead 7, finishing lead 10, to finishing lead 13, starting lead 13, to starting lead 16, starting lead 2, to starting lead 5, finishing lead 5, to finishing lead 9, starting lead 11, to starting lead 14, finishing lead 14, to finishing lead 18, starting lead 17, to starting lead 3, finishing lead 3, to finishing lead 6, starting lead 8, to starting lead 12, finishing lead 12, to finishing lead 15; interconnected finishing lead 17 and starting lead 8 of coil groups form lead 19; interconnected starting leads 1 and 15 of coil groups form lead 20; interconnected finishing leads 2 and 16 of coil groups form lead 21; interconnected starting lead 6 and finishing lead 8 of coil groups form lead 22; interconnected finishing lead 7 and starting lead 8 form lead 23; interconnected starting lead 9 and finishing lead 11 form lead 24. Four- pole winding is obtained by applying voltage across leads 19, 20, 21. Phase leads are delta connected. For changing over to six-pole arrangement voltage is applied across leads 22, 23, 24 and leads 19, 20, 21 are interconnected. Phase leads are star-star connected. EFFECT: enhanced utilization of motor dimensions at low speed. 5 dwg

Description

 The invention relates to electrical engineering, in particular to electric machines, and may find application in asynchronous electric motors with step-controlled speed control.

 Known pole switch winding with the ratio of the numbers of pairs of poles 2: 3 [1], consisting of a two-layer pole switch winding connected in a triangle at 2p = 4 and two stars at 2p = 6, and a single layer additional winding. The disadvantage of this winding is the complexity of manufacturing technology.

 Closest to the invention is a pole-switchable winding at 6-4 poles [2]. The winding contains 18 coil groups with numbers from 1 to 18 and conclusions with numbers from 19 to 24.

 The number of coils in each coil group is determined in accordance with the number series 2K, 3K, 2K, 2K, 2K, 3K, 2K, 1K, 1K, 2K, 3K, 2K, 2K, 2K, 3K, 2K, 1K, 1K, where K - a positive integer, while the end 1 of the coil group is connected to the end 4 of the coil group, the beginning 4 - with the beginning 7, the beginning 10 - with the beginning 13, the end 13 - with the end 16, the beginning 2 - with the beginning 5, the end 5 - with end 9, end 11 - with end 14, beginning 14 - with beginning 18, beginning 17 - with beginning 3, end 3 - with end 6, end 8 - with end 12, beginning 12 - with beginning 15; end 17, beginning 1, end 2 of the coil groups are respectively conclusions 19, 20, 21; the combined beginnings of 6 and 8 coil groups form a conclusion 22; the combined ends of 7 and 10 of the coil groups - conclusion 23; the combined beginnings of 9 and 11 reel groups - output 24, end 18, beginning 16 and end 15 of reel groups are combined into a star.

 The disadvantage of this winding is the low degree of use of the size of the electric motor at 6 poles.

 The present invention solves the problem of increasing the degree of use of the size of the electric motor at a lower speed and expanding the scope of the electric motor with the proposed stator winding.

 This problem is achieved by changing the compounds of the coil groups in each phase. The number of coils in each coil group is determined in accordance with the number series 2K, 3K, 2K, 2K, 2K, 3K, 2K, 1K, 1K, 2K, 3K, 2K, 2K, 2K, 3K, 2K, 1K, 1K, where K - a positive integer, while the end 1 of the coil group is connected to the end 4 of the coil group, the beginning 4 - with the beginning 7, the end 10 - with the end 13, the beginning 13 - with the beginning 16, the beginning 2 - with the beginning 5, the end 5 - with end 9, beginning 11 - with beginning 14, end 14 - with end 18, beginning 17 - with beginning 3, end 3 - with end 6, beginning 8 - with beginning 12, end 12 - with end 15; the combined end 17 and the beginning of 18 coil groups form a conclusion 19; the combined beginnings of 1 and 15 of the coil groups form a conclusion 20; the combined ends of the 2 and 16 coil groups - conclusion 21; the combined beginning of 6 and the end of 8 coil groups form a conclusion 22; combined end 7 and beginning 10 - conclusion 23; combined beginning 9 and end 11 - conclusion 24.

 The winding can be performed in engines with a multiple of 36 grooves on the stator, for example 36, 72.

 In FIG. 1 shows a winding diagram for an electric motor with 36 slots on a stator; in FIG. 2-5 show the direction of the current on the sides of the coils and the curves of the magnetomotive forces of the winding.

 The winding contains 18 coil groups with numbers from 1 to 18 and conclusions with numbers from 19 to 24.

 The number of coils in each coil group is determined in accordance with the number series 2K, 3K, 2K, 2K, 2K, 3K, 2K, 1K, 1K, 2K, 3K, 2K, 2K, 2K, 3K, 2K, 1K, 1K, where K - a positive integer, while the end 1 of the coil group is connected to the end 4 of the coil group, the beginning 4 - with the beginning 7, the end 10 - with the end 13, the beginning 13 - with the beginning 16, the beginning 2 - with the beginning 5, the end 5 - with end 9, beginning 11 - with beginning 14, end 14 - with end 18, beginning 17 - with beginning 3, end 3 - with end 6, beginning 8 - with beginning 12, end 12 - with end 15; the combined end 17 and the beginning of 18 coil groups form a conclusion 19; the combined beginnings of 1 and 15 of the coil groups form a conclusion 20; the combined ends of the 2 and 16 coil groups - conclusion 21; the combined beginning of 6 and the end of 8 coil groups form a conclusion 22; combined end 7 and beginning 10 - conclusion 23; combined beginning 9 and end 11 - conclusion 24.

 If the voltage is applied to the terminals 19, 20, 21, then we get 4 poles (figures 4 and 5). Phase connection diagram - triangle. If the voltage is applied to the terminals 22, 23, 24, and the conclusions 19, 20, 21 to combine, then we get 6 poles (figure 2 and 3). Phase connection diagram - two stars. In FIG. 2-5 directions of currents and curves of magnetomotive forces correspond to the passage of current in phase A through the maximum positive value. The sides of the coils of phase A are indicated by a square, phase B by a triangle, phase C by a circle.

The values of the winding coefficients at the winding pitch y = 7 are K _{о1 (2p = 4)} = 0.78 and K _{о1 (2p = 6)} = 0.85.

 Thanks to the adopted scheme for connecting coil groups, it is possible to increase the degree of use of the size of the electric motor at a lower speed compared to the prototype.

Sources of information
1. 4A series induction motors. Directory. - M .: Energoizdat, 1982 (winding circuits of 6-4 poles).

 2. Application for invention, patent 2171539, 07/27/01, cl. H 02 K 17/14, H 02 K 3/28 2001 - prototype.

Claims (1)

 Pole-switching winding at 6-4 poles, in which the coil groups are divided into 18 coil groups and the number of coils in each coil group is determined in accordance with the number series 2K, 3K, 2K, 2K, 2K, 3K, 2K, 1K, 1K, 2K, 3K, 2K, 2K, 2K, 3K, 2K, 1K, 1K, where K is a positive integer, characterized in that the end 1 of the coil group is connected to the end 4 of the coil group, the beginning 4 to the beginning 7, the end 10 to the end 13, beginning 13 - with beginning 16, beginning 2 - with beginning 5, end 5 - with end 9, beginning 11 - with beginning 14, end 14 - with end 18, beginning 17 - with beginning 3, end 3 - with end 6, the beginning of 8 - 12 with the beginning, end 12 - with the end 15; the combined end 17 and the beginning of 18 coil groups form a conclusion 19; the combined beginnings of 1 and 15 of the coil groups form a conclusion 20; the combined ends of the 2 and 16 coil groups - conclusion 21; the combined beginning of 6 and the end of 8 coil groups form a conclusion 22; combined end 7 and beginning 10 - conclusion 23; combined beginning 9 and end 11 - conclusion 24.

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