SU955392A1 - Three-phase pole-switching winding for two-speed ac machines - Google Patents

Description

FIELD OF THE INVENTION The invention relates to electrical switchable windings of electrical machines of alternating current.

A three-phase pole-switching winding is known for two-speed AC machines with a 2: 3 ratio of pole numbers, which, when the number of pole pairs is a multiple of three, is connected in a T-shape for a three-phase supply 1.

The disadvantage of this winding is the relatively large number of leads (TO) that are required to change the rotational speed.

A three-phase pole-switching winding is known with a pole ratio of 2: 3, which is made of 12 identical coil groups connected T-shaped to three parallel branches with a pole number multiple of three 2j.

 In the winding, full use of winding copper is achieved at both pole numbers with a relatively small number of leads (8 leads) per rotation frequency switch. The disadvantage of this winding is the asymmetry of the currents in the phases with a T-shaped connection.

A three-phase winding with a pole number switching in the 2: 3 ratio, which is made of 12 coil groups, is known. Odd coil groups are connected between three parallel branches with two successively connected coil groups in each branch, and even ones are connected to the middle points of these branches.

10 coil groups, three of which are connected in parallel, and the other three in series 3.

The winding is two-layered, equally-divided, has three independent leads

15 for each number of poles and ensures the symmetry of the currents in the phases.

The disadvantages of this winding are a relatively large number of winding coils and an incomplete use (75%) of winding copper at high speed.

Closest to the proposed is a 2-speed winding with a pole ratio of 2: 3.

25

The winding contains 12 coil groups, each of which is made of two concentrically arranged coils with the ratio of the numbers of turns of the outer and inner coils 1; 2.

30 Odd; The coil groups are interconnected in three parallel branches with two counter-coil coil groups in each branch, and three even coil groups are connected to the middle points of these branches in series with which are the internal coils of the three remaining celled coils, and the external coils of these coil groups are connected to three points of interconnection between even and odd coil groups. Winding is performed in a single-layer-two-layer with a relatively small number of elements, has independent leads for both numbers of poles, ensures the symmetry of the currents in phases 4

The disadvantages of the known winding are incomplete use (83.3%) of winding copper with a smaller number of poles and the presence of a relatively large number (24) of coils, which conditions the winding, reduces the use of the size of the machine, and degrades the characteristics of the engine.

The goal and: acquisitions - simplifying the frosts and improving the performance of the engine,.

This goal is achieved by the fact that the winding is made of 12 basic identical KaTyujeK, uniformly distributed along the machine bore and b additional identical coils concentrically arranged along the main even coils and designated respectively by serial numbers 2, 4, b, 8, 10, 12, of which even and odd main coils are connected into separate groups with three parallel lines in each group and with two consecutive 1 and 2 coils in each branch, the sequence numbers of which are 1-7, 9-3, 5- 11 for one group and, 6-12., 2-8 for the other group with the reverse connection of even coils compared to odd nogles, and between the middle points of the parallel branches of both groups of the main coils, two additional coils connected with opposite numbers with serial numbers 4- -10, 12 -6, 8-2, connecting respectively parallel branches with the numbers of coils 1-7 and 10-4 9-3 and 6-12, 5-11 and 2-8, with the conclusions for the number of pairs of poles p- 2 are the points of connection by the method of additional coils, and the conclusions for p-3 are the points of connection of the main coils with pores Such numbers are 1-9-5, 7-3-11 and 2-6-10.

FIG. Figure 1 shows a diagram of the connection of elements of a 2-speed winding with a pole ratio of 2: 3; on 2 - the scheme of a three-phase two-speed winding with the numbers of poles 2p-4 and 2p-6 is deployed; on

Fig, 3 is a diagram of a three-phase two-speed winding with the numbers of poles 2p-4 and 2p-6 and two-layer execution of the main coils.

A three-phase two-speed winding contains 12 main and 6 additional coils. The main coils of the winding are identical and evenly distributed along the bore of the machine. They are denoted by order numbers 1–12 and are connected in two separate groups, one of which consists of even and the other of odd coils. In each group, the coils form three parallel branches with two consecutive counter-connected coils in the crawler branch, the sequence numbers of which are 1-7, 9-3, 5-11 for one group and 10-4, 6-12, 2-8 for the other groups, with even coils having a reverse connection as compared to odd ones, for example, odd-numbered coils in each parallel branch are connected to each other by ends, and even-numbered coil heads.

Additional coils are arranged concentrically with respect to the main even coils and are labeled 2, .4, b, B, Yu, 12, respectively (Fig. 2). They are made with the number of turns two times smaller than the main coils (wound in two wires) and interconnected in pairs, and each pair of coils is connected between the middle points of the parallel branches of both groups of main coils. In this case, the coil connections are in serial numbers 4 -10 with coils 1-7 and 10-4, 12-bs 9-3 and 6-12, 8-2c 5-11 and 2-8 (Fig. 1).

The winding has 6 terminals and is BILLED with the number of slots 36 and short 36. The winding leads for the number of pairs of p-2 poles are from the connection points, between additional coils, and the connection points of the beginnings of the main coils with serial numbers 1-9 5, 7-3-11, and the ends of the coils 2-6-10 are pins for p-3. The winding pins are independent for each number of pole pairs.

The winding is connected T-shaped with three parallel branches at p-3. At this frequency of rotation, 83.3% of winding copper is used and current symmetry is achieved in phases due to the inclusion of additional coils with elongated groove pitch (y 9) in phase B | j (Fig. 2), causing a decrease in the emf of this phase, necessary to obtain a symmetrical three-phase emf with a T-shaped winding on. It should be noted that the symmetry of the currents in the phases will be ensured even with a shortened step (3) of additional winding coils. In addition, additional coils can be

arranged concentrically with respect to the odd main coils. Moreover, the principle of combining the main and. The additional coils for producing a 2-speed winding with a pole ratio of 2: 3 (Fig. 1) does not change.

At the highest frequency of rotation at p-2, the winding is connected into a star with four parallel branches. The use of copper winding is 100%.

FIG. 3 shows a variant of the winding, in which the main coils are presented in two-layer performance. Such a winding can be used, if necessary, to improve the harmonic composition of the magnetizing force curve.

Claims (4)

Compared to the known two-speed rpm windings of the proposed type, the winding is characterized by simplicity of design, which reduces the laboriousness, is manufactured, by increased use of the machine envelope at the highest frequency of rotation, and better filling of the grooves with winding copper. The winding has a minimum number of leads and independent inputs for each number of pole pairs. It can be used in multi-speed motors, in machines with an internal cascade, in regulated motors with a non-contact change in the number of pole pairs. The invention is a three-phase pole-switching winding for two-speed AC machines with a ratio of 2: 3 Luses for a number of slots 36 having independent inputs for both poles and switching on when the number of poles is a multiple of three, T-shaped with three parallel branches, o l and h and y sch a. With the fact that, with a view simplifying the winding and improving the engine performance; the winding is made of 12 main identical coils evenly distributed over the machine bore and 6 additional identical coils concentrically located with respect to the main 1 even coils and designated respectively by serial numbers 2, 4, b, 8, 10, 12, of which are even and the odd main coils are connected into separate groups with three parallel branches in each group and with two consecutive counter-connected coils in each branch, the sequence numbers of which are 1-7, 9-3, 5-11 for one group and 10-4, 6 –12, 2–8 for another group with reverse connection of even coils along., Compared with odd ones, and between the middle points of parallel branches of both groups of main coils, two additional coils connected together with opposite order numbers 4–10, J.2 - b & -2, Parallel branches connecting respectively with the numbers of coils 1-7 and 10-4, 9-3 and 6-12, 5-11 and 2-8, and the conclusions for the number of pairs of poles p-2 are the points of connection between them , additional coils, and pins for p-3. are the points 3 and the connections of the main coils with software 7 serial numbers 1-9-5, 7-3-11 and 2-6-10. Sources of information taken into account in the examination 1.N. Seguenz. Die Wicklungen elektrischer Maschinen. Baud III, Wien. 1954, p. 87-88. 2. USSR author's certificate number 408423, cl. H 02 K 3/28,. 3. USSR author's certificate number 508864, cl. H 02 K 3/28, 1971. 4. USSR author's certificate according to hf 2965173 / 24-07, cl. H 02 K 3/28, 1980., 9 50 . 3 h / -v-vx 5 J4 be. 2 zb 55 .rWx / 2.