SU1330709A1 - Pole-commutated winding - Google Patents

Abstract

The invention relates to multi-speed windings of AC electric machines with switching pole numbers. The aim of the invention is to simplify the winding and reduce the number of leads. A winding with a ratio of pole pair numbers of 1: 3 is intended for the number of slots and. multiple 36, Winding contains 12 coil groups (CG), evenly distributed on the bore of the machine. in which even and odd QGs are interconnected T-shaped with terminals from the extreme points of the T-shaped connection of the winding for the number of pairs of poles p-3. Odd CGs are made with the number of coils in the group twice as large as even CGs, and form six branches, with the end of the first branch connected to the end of the second branch, the second one - from the beginning of the third, the third end - to the end of the fourth branch, and The fifth and sixth branches are connected in parallel with the second and third branches. The even CGs are interconnected in series in the seventh branch, which is connected. to the junction of the second, third, fifth, and sixth branches. The terminals for the number of pairs of poles are made of the connection points between each other of the first and second, second and third and fourth branches of the winding. Switching the number of pole pairs is carried out using 6 pins, and when switching from one number of pole pairs to another, the winding can be disconnected from the mains. 2 Il. § (L s 00 co

Description

The invention relates to multi-speed pole-switching windings of electric machines of alternating current and can be used in multi-speed asynchronous motors with a ratio of pole pair numbers of 1: 3.

- The aim of the invention is to simplify the winding and reduce the number of outlets.

Figure 1 shows a diagram of the connection of elements of a three-phase pole-selectable winding with a ratio of pole pair numbers of 1: 3; FIG. 2 illustrates a three-phase pole-switched winding circuit with the number of poles 2 and 6 for the number of slots Z 36.

A three-phase two-speed winding with a ratio of 1: 3 pole pair numbers contains 12 coil groups with numbers from 1 to 12 evenly distributed over the machine bore, in which the odd coil groups are made with the number of coils in the group twice as large as the even-coil groups (figure 2). Odd coil groups form six branches with numbers of coil groups in branches x: 1 in the first branch, 1 1 in the second, 9 in the third, 7 in the fourth, 5 in the fifth and 3 in the sixth branch, and even The coil groups are interconnected sequentially in the seventh branch, with the coil groups 4, 8, 12 included oppositely with respect to the coil groups 2, 6, 10. The branches with odd and even coil groups are interconnected T-shaped, and the end of the first branch is connected with the end of the second, the beginning of the second - with the beginning of the third, the end of the third - with the end of the solid branch, .la, parallel to the second and third branches, are connected respectively to the fifth and sixth branches with a consonant inclusion of the coil groups of these branches at the connection points. The seventh branch with even coil groups is connected to the junction between the second, third, fifth and sixth branches with the consonant inclusion of the coil groups 4, 8, 12 and the opposing two, 6, 10 with respect to the coil groups of the fifth and sixth branches in junction point. The winding pins CJ / A ,, B, Aj / Cj. for the number of pole pairs, p 3 is made from the beginning of the first, seventh and fourth branches, and the pins At, B, C

for p 1 of the junction points of the first and second, second and third, third and fourth branches (Fig. 1).

The winding is double-layered with a step of grooves close to or equal to the diametral winding pitch, with the number of pole pairs p 1. This ensures high values of winding coefficients for p 1 and p 3 for which the groove pitch equal or close to triple diametral step. The winding is designed for the number of slots Z 36 and a multiple of 36, and the switching frequency of rotation is carried out using 6 pins. When the number of pole pairs is p 1, power is supplied to pins Aj, Bj, Cj, and the winding is connected in a triangle with two parallel branches by connecting

five

0

five

five

Dov A j / C and A

H

: j / A4 and c.

With

p 3 three-phase power is supplied to the terminals Cj / A, B, and a T-shaped connection of the winding phases is provided. Winding allows the transition from one number of pairs of poles to another without disconnecting the motor from the mains. Thus, pins Aj / C, B, to which the voltage is applied at p 3 can be connected to pins Aj, B., C for p 1 without disconnecting from the network, because in the seventh branch, which is not used at p 1, the resulting emf is zero for a given number of poles.

In the proposed winding, the symmetry of the currents in the phases is ensured for all values of the number of pole pairs. The use of winding copper with p 3 is 100%, and with p 1 it is 66.6%.

Claims (1)

Invention Formula A pole-winding winding with a pole ratio of 1: 3 for the number of slots Z 36 and a multiple of 36, containing 12 coil groups evenly distributed along the machine bore, in which even and odd coil groups are interconnected T-shaped with the outputs from the T-shaped ends connections for the number of pairs of poles, characterized in that, in order to simplify the winding and reduce the number of conclusions, the odd coil groups are made with the number of coils in the group twice as large as the even coil groups, and form six with numbers of coil groups in branches x: 1 - the first branch, 11 - in the second, 9 - in the third, 7 - in the fourth, 5 - in the fifth, 3 - in the sixth branch, with the end of the first branch connected to the end of the second , the beginning of the second - with the beginning of the third, the end of the third - with the end of the fourth branch, and parallel to the second and third branches of m are connected respectively the fifth and sixth branches with a consonant inclusion of the coil groups of these branches at the points of connection and with leads from the points of connection of parallel branches for the number of pairs of poles p 1, while the even-numbered coil groups are interconnected in series in the-seventh branch, which is connected to the connection point between them second, third, heel | the sixth branches with consonant inclusion of the coil groups 4, 8, 12 and the opposite - 2, 6, 10 with respect to the coil groups of the fifth and sixth branches. Aflcf 2.6. ten FIG. one Compiled by A. Ketsaris Editor A. Lezhnin Tehred I. Popovich Order 3589/54 Circulation 659 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 , - - - -, - - -. ". I-" ... - ". ..- ". - -. Production and printing company, Uzhgorod, Projecto st., 4 Proofreader V.Girn to