SU1474803A1 - Three-phase switchable-pole winding with 4:3 pole pair number ratio - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to expand the scope by making Z = 48 in the number of slots. The winding with the ratio of the number of pairs of 4: 3 pairs is intended for the number of slots Z = 48 and a multiple of 48. The winding contains 12 coil groups (CG) with concentric coils in groups, CG interconnected in six branches x with sequence numbers 1 and -7 in the first branch, 9 and -3 in the second branch, 5 and -11 in the third branch, 4 and -10 in the fourth branch, 12 and -6 in the fifth branch, 8 and -2 in the sixth branch, where the (-) sign means counter group inclusion. The first, second and third branches are interconnected in parallel, and the middle points of these branches are connected to the ends of the fourth, fifth, and sixth branches, the beginnings of which are interconnected. Odd KG is made of three coils with steps along the grooves y = 8.6.4, in which the middle coil has twice the number of turns, and even KG 4,8,12 are made of two coils with steps along the grooves y = 6, 4 and a copper cross section twice as large as other winding coils. CG with numbers 2,6,10 are made of four coils with steps along the grooves y = 10,8,6,4, in which two internal coils have twice the number of turns, and the ratio of the number of turns of external coils, even CG, is equal to 0.7: 0.3. The winding contains three independent terminals for both numbers of poles. For 2p = 8, conclusions are made from connection points KG 2-8, 10-4, 6-12, and for 2p = 6 - from connection points KG 1-9-5, 3 -7-11, 2-6-10. 2 Il.

Description

one

The invention relates to three-phase pole-selectable windings of multi-speed AC electric machines.

The aim of the invention is to expand the scope of application by performing in the number of slots z 48 and a multiple of 48.

Figure 1 shows a diagram of the connection of the elements of a three-phase two-speed winding with the ratio of the numbers of pole pairs 4: 3; FIG. 2 shows a three-phase winding circuit with the numbers of pole pairs 4 and 3 for the number of slots z 48.

The three-phase two-speed winding with the ratio of the numbers of pole pairs 4: 3, designed for the number of slots z 48 and a multiple of 48, contains 12 kiln coils formed by concentrically arranged coils displaced between the axes of the coil groups along the machine boring on four-slot grooves. The odd coil winding groups are made of three concentric coils with groove steps of 8.6.4, with the middle coil containing twice the number of turns compared to other coils of the group due to its single-layer design. These groups are interconnected in three parallel branches with two counter-included coil groups in each BejrBH sequence numbers 1 and -7 in the first branch, 9 and -3 in the second branch, 5

and -11 in the third branch, and from the points of connection of parallel branches, in which the beginnings of the coil groups 1-9-5 and 3-7-1lj are connected, the terminals Afc and C6 are made for the number of poles 2p 6. Even coil winding groups with order numbers 4.8, 12 are made of two concentric coils with steps along the grooves in 6, 4 and a copper cross-section twice as large (wound in two wires) compared with the other winding coils, and coil groups with numbers 2; 6, 10 are made of four concentric coils with groove steps at 10, 8, 6, 4, and two internal coils with groove steps at 8.6 have a single-layer design, and the ratio of the numbers of turns of the external coils of even coil groups with two and the four coils in the group, located in the same grooves, is equal to 0.7: 03 (Fig. 2) .. The even coil groups are interconnected in pairs with opposite numbers 4 and -10 in the fourth branch, 12 and - 6 in the fifth branch, 8 and -12 in the sixth branch, where the sign (-) means the opposite inclusion of the coil group, and from soy the lines of the coil groups in the branches were drawn Ag, B8, C8 for the number of poles. The ends of the fourth, fifth, and sixth branches, representing the beginnings of the coil groups 4, 12, 8, are connected to the middle of the first, second, and third branches, respectively, and the beginnings of these branches, representing the beginnings of the coil groups with numbers 2,6,10, are connected between themselves forming the output B6 dl (figure 1).

The proposed winding has three independent leads for each number of pole pairs and is connected with a star with three parallel branches, and with a T-shape with three pa

parallel branches. The winding is single-layer, in which the single-layer part is 50%, and is intended for the number of slots z 48 and a multiple of 48.

The winding can be used in multi-speed AC motors. The presence in the winding of independent terminals for both numbers of poles expands its use. It can be used in machines with an internal cascade and in adjustable electric motors with a contactless change in the number of pole pairs.

The economic effect of using the proposed winding is achieved by expanding the field of application of the known winding, which has a simple design and ensures full use of winding copper at both pole numbers, for the number of slots z 48.

Claims (1)

Invention Formula A three-phase pole-switched winding with a ratio of the numbers of pole pairs 4: 3, containing 12 coil groups with numbers from 1 to 12, formed by concentrically arranged coils and evenly distributed along the bore of the machine with an offset between the oboles of the axes of the klututnyh groups on even-slot divisions, in which the odd coil groups are interconnected in three parallel branches with two counter-included coil groups in each branch, the sequence numbers of which are I and -7 in the first branch, 9 and -3 in the second branch, 5 and -11 in the third branch with the terminals of phases A and C for the number of poles from the junction points of the parallel branches, in which the beginning of the coil groups 1-9-5 and 3-7-11 are interconnected, and the even-coil groups are connected between myself in fdve counter with serial numbers-1 ram 4 and -1 0 in the fourth branch, 12 and -6 in the fifth branch, 8 and -2 in the sixth branch with the conclusions of phases A, B, C for from the junction points of the coil groups in the branches, and the ends of the fourth, fifth and sixth branches are represented by The beginnings of the coil groups 4, 12, 8, are connected to the middle of the corresponding first, second and third branches, and the beginnings of these branches, representing the beginnings of the coil groups 2,6, JO are interconnected, forming o five five 0 the output of the fa B in, characterized in that, in order to expand the scope of application by making the number of slots z 48 in number, the odd coil groups are made of three concentric coils with steps along the grooves y 8,6,4, and the middle coil with step grooves in 6 contains twice the number of turns compared with other coils of the group, and even coil groups with serial numbers 4.8, 12 are made of two concentric coils with steps along the grooves at 6.4 and copper section twice as large compared to the other coils, the windings, and the coils E groups with serial numbers 2, 6, 10 are made of (four concentric coils with groove steps at 10, 8, 6, 4, in which two internal coils with groove steps at 8, 6 have a single-layer design, and the ratio of turns external coils of even coil groups with two and four coils in a group located in the same grooves, is 0 ,. eight FIG. one