JPH02136052A - Pole-changing type three-phase armature winding - Google Patents

Abstract

PURPOSE:To improve the space factor in a slot by making an insulator between coil sides unnecessary through making one slot contain one coil side. CONSTITUTION:A U-shaped winding is composed of two two-set coils A1, A3 and two one-set coils A2, A4 and said two-set coils A1, A3 are respectively constituted by concentrically arranged outer coil 101 and inner coil 102. The coil arrangement of a V-phase winding is composed of two two-set coils B1, B3 and two one-set coils B2, B4 and a W-phase winding, as shown by one dotted chain line, is constituted by six one-set coils C1-C6, differing from said U- and V-phases. Each phase winding is a single-layer concentric winding and contains one coil side by one slot.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention provides a three-phase armature with a switched pole number in which a pole ratio of 3:4 is obtained by changing the connection of a single winding. Concerning improvements in windings.

(Prior art) A three-phase armature winding using a single winding method with a switching number of poles has a smaller mechanical dimension of a rotating machine than a two-winding method that uses two windings to obtain two different numbers of poles. It has the advantage that it can be made small and there is no risk of circulating current flowing in the winding.

When adopting this type of system, a simple winding configuration is possible in the case of multiple switching where the pole number ratio is 2:1, but in cases other than multiple switching, for example, when the pole number ratio is 3 = 4. It is common to adopt the so-called PAM method for such devices. FIG. 11 shows a conventional example in which, for example, 6-pole/8-pole switching is possible using this PAM method.

(Problem to be Solved by the Invention) However, in the conventional example shown in Fig. 1, the overlapping winding method is used, and two coil sides are housed in the same slot, and coils of different phases are placed next to each other. Therefore, sufficient consideration must be given to the insulation within the slot and between the coils.
Not only does the manufacturing work become complicated, but the space factor deteriorates, making it impossible to avoid increasing the size of the core. In addition, as is clear from the drawings, there are an extremely large number of coils and the connection of crossover wires between the coils is quite complex, making winding work difficult.Moreover, since there is a two-layer field, it is difficult to store the coils. It is difficult to automate and must be done manually, which has the disadvantage of poor productivity overall.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to improve the switching type three-phase electric motor which can increase the space factor, reduce the core size, and improve productivity. It is to provide a child winding.

[Structure of the Invention] (Means for Solving the Problems) The pole number switching type three-phase armature winding of the present invention is one in which the pole number ratio can be switched to 3:4 in the 111-winding, ￥S The windings of the 1st phase and the 2nd phase are made of a 2-piece coil consisting of an outer coil with a coil pitch of [Z/PI] and an inner coil with a coil pitch of [(Z/P,)-2], It consists of a single continuous coil with a coil pitch of [(Z/P,)-1], and the third phase winding has a coil pitch of [(Z/P,)-1].
P, )1] and a coil pitch of [(
Z/PI)-2] is composed of a single continuous coil,
It is characterized in that each of the windings is a single-layer concentric winding.

Here, Z is the number of slots, and Pl is the number of high-speed poles.

(Function) According to the above configuration, one slot has one coil side, so
There is no need for an insulator between the sides of the coil, improving the space factor within the slot. Because it is concentric winding, the number of coils and crossover wires are drastically reduced compared to lap winding, making the coil manufacturing process easier.
Mechanization of coil insertion work also becomes an F+J capability.

(Example) Hereinafter, a first embodiment in which the present invention is applied to a three-phase induction motor will be described with reference to FIGS. 1 to 7.

Figure 1 shows the winding development diagram. The number of slots Z is 36, the number of high-speed poles P1 is 6, the number of low-speed poles P2 is 8, and the pole number ratio is 3.
:4.

The six windings of the U phase (first phase) and V phase (second phase) are wound in the same pattern, and the winding of the W phase (third phase) is wound in a different pattern.

First, let's talk about the U-phase winding.As shown by the solid line in Fig. 1, it consists of two twin coils A.

A, and two single-strand coils A2. The two-piece coil A, , A is composed of an outer coil 101 and an inner coil 1.02 which are arranged concentrically.

Here, the outer coil 101 constituting the two-piece coil A
is arranged between the slot numbered 2 (hereinafter referred to as slot #2. The same applies to other numbers) and slot #8, and therefore the coil pitch is [Z/P+]
6, which corresponds to .

Further, the outer coil 101 constituting the two-piece coil A3 is disposed across the slot #20 and the slot #26, so the coil pitch is also 6, which corresponds to [Z/PI]. On the other hand, the inner coil 102 constituting the 2-piece reception coil A1 is arranged between slot #3 and slot #7, and therefore the coil pitch is [(Z/P
, ) -2] 1: 4 corresponding to H1, and the inner coil 102 constituting the two-piece coil A is in the slot #2
] and slot #25, so the coil pitch is also 4, which corresponds to [(Z/P,)-2].
It is. The 1-piece receiving coil A4 is arranged between slot #10 and slot #15, so the coil pitch is 5, which corresponds to [(Z/PI)-11, and the 1-piece receiving coil A2 is arranged between slots #10 and #15. Slot #28 and Slot #33
Therefore, the coil pitch is also 5, which corresponds to [(Z/PI)-1]. and,
Each of these coils A1 to A4 is connected to a terminal U + , U2
, N are connected as shown in the diagram, and the U phase winding is #I.
-1 has been completed.

Next, the V-phase winding indicated by the broken line in FIG. 1 will be described.

This coil arrangement consists of two double-stranded coils B + ,
Bj and two single-series coils B, , -84, and the two-series coils B, , B are composed of an outer coil 101 and an inner coil 102 arranged concentrically. It is similar to a line. And again, terminals V,, V2. N is connected as shown in the figure to form a phase winding, which is arranged at a predetermined electrical angle offset from the U phase winding.

Next, the W-phase winding is as shown by the dashed line in FIG. 1, and unlike the U-phase and V-phase, it is composed of six single-piece coils CC, . Two of these single-piece coils C2,
C1 has a coil pitch of 5, which corresponds to [(Z/PI)-1], and in order, thrower l-135 and slot #4
, and between thrower I-#17 and thrower I-#22. Also, 40. The coil pitch of the one-piece coils C1c, C4, and C in ■ is [(
4 corresponding to Z/P, ) 2], and in order slot #
30 and slot #34, between slot #5 and slot #9, between slot #12 and slot #16,
It is arranged across slots #23 and #27. Each of these coils C1 to C6 is connected to a terminal Wl,
W2. A W-phase winding is constructed by connecting the windings as shown in the figure.

As is clear from FIG. 1, each phase winding constructed as described above is a single layer concentric winding, and one coil side is housed in one slot.

In order to perform high-speed operation with six poles in the above configuration, as shown in FIG. ,,V2
．． Connect w2 to the power supply (7) R, S, and T terminals to make a 2Y connection. Figure 4 shows the magnetomotive force waveform at the moment when a current of +1 flows through the U-phase winding, 1 1/2 current flows through the V-phase winding, and -1/2 current flows through the W-phase winding in this state. It is clear that the magnetic poles of the poles are formed. In addition, the vector diagram of the induced voltage of each phase winding in this connection state is shown in Figure 6, and it is clear that the interphase phase angle is 120'' and is balanced.Incidentally, each winding coefficient is also is the same value.

On the other hand, in order to perform low-speed operation with 8 poles, as shown in FIG. 3, with the neutral point N of each phase short-circuited, the terminals U2. V2.
W, open, terminals U,, V.

Connect Wl to the R, S, and T terminals of the power supply to make an IY connection. In this state, the waveform of the magnetomotive force at the moment when a current of +1, Vt (1 1/2 to 1 winding, 1 1/2 to W phase winding) flows in the U-phase winding is shown in Figure 5. As shown in Figure 7, the vector diagram of the induced voltage in each phase winding in this connected state is clearly 8 magnetic poles. and equilibrate.

According to this embodiment, since a single-layer concentric winding is formed with one coil side per slot, insulation between the coil sides is not required, and the insulation structure within the slot is simple and easy.
It becomes 1t. As a result, the space factor increases and the iron core/J method can be made smaller than conventional equivalent products. Furthermore, the number of coils is halved compared to conventional lap winding, and the number of crossover wires between coils is also reduced, greatly increasing productivity of the coils. Furthermore, automatic insertion of the coil, which was difficult with conventional overlapping winding, becomes easily possible, so productivity can be greatly improved from this aspect as well.

In addition, in the above explanation, the high speed pole is 2Y, and the low speed pole is 1Y.
Although we have described an example in which the windings of each phase are connected to terminals X+, Y+, and Z+ as in the second embodiment shown in FIG.
,
As shown in the figure, a 1Δ connection can be made. The second embodiment differs from the first embodiment in that a terminal is added, and is otherwise the same as the first embodiment, so the same number 71 is attached to the same coil and detailed explanation is omitted. do.

In addition, in each of the above embodiments, the number of slots is 36, and 6 poles/8
Although the case of pole switching has been shown, the present invention is not limited to this. In the case of 12 pole/16 pole switching with 72 slots, it is sufficient to have two sets of the winding configuration of the above embodiment in succession, and also with 72 slots. To achieve 6-pole/8-pole switching, the number of coils constituting each phase winding of the above embodiment may be doubled.

[Effects of the Invention] As described above, according to the present invention, a pole number switching type three-phase armature winding can be constructed using a single-layer concentric winding method.
The coil space factor in the slot can be increased, the core size can be made smaller, and both the coil manufacturing and insertion operations can be made much simpler, which has the excellent effect of greatly increasing productivity. It is something.

[Brief explanation of the drawing]

1 to 7 show a first embodiment of the present invention, in which FIG. 1 is a developed winding diagram, FIG. 2 is a winding connection diagram during six-pole operation, and FIG.
The figure is a winding connection diagram during 8-pole operation, Figure 4 is a magnetomotive force waveform diagram during 6-pole operation, Figure 5 is a magnetomotive force waveform diagram during 8-pole operation, and Figure 6 is a winding diagram during 6-pole operation. A vector diagram of the line induced voltage, Figure 7 is a vector diagram of the winding induced voltage during 8-pole operation, Figures 8 to 10 show the second embodiment of the present invention, and Figure 18 is a developed winding diagram. , FIG. 9 is a winding connection diagram during 6-pole operation, FIG. 10 is a winding connection diagram during 8-pole operation, and FIG. 11 is a developed winding diagram showing a conventional example. In the drawing, At and Ai are the first phase two-piece coil, A2. A
4 is the first phase one-piece continuous coil, B,,B. is the second phase two-piece coil, B2. B4 is a second-phase one-piece coil, C1 to C0 are third-phase one-piece coils, 101 is an outer coil, and 102 is an inner coil. Applicant Toshiba Corporation S Male 3 Figure ■ Figure Su Ward

Claims (1)

[Claims] 1. In a single winding with a pole ratio of 3:4, the first and second phase windings are arranged so that the coil pitch is [Z/P_
1] and the coil pitch is [(Z/P_
1)-2], a two-wire coil consisting of an inner coil,
It consists of a 1-piece coil with a coil pitch of [(Z/P_1)-1], and the third phase winding is a 1-piece coil with a coil pitch of [(Z/P_1)-1]. and,
A pole number switching type three-phase armature winding (Z is the number of slots, P_1 is the number of high-speed poles).