JPS62296732A - Polyphase armature winding - Google Patents

Abstract

PURPOSE:To increase degree of freedom in selection of coil pitch or winding factor, by a method wherein each coil is wound so that the sum of numbers of conductors coil sides disposed on both sides of the coil becomes odd number. CONSTITUTION:The figure shows a coil arrangement diagram of three-phase armature winding of 4 poles and 48 slots, in two-layer lap winding where the number of slots per phase is 4 being odd number (=48/3X4). Each coil 50 is constituted by 1.5 turns of conductor. Consequently, the number of conductors in one coil side is two and that in the other coil side is one, thus the sum of the numbers of conductors coil sides becomes 3 (=2+1) being an odd number. The coils 50 with front and rear surfaces turned are arranged alternately. In this constitution, in spite of two-layer lap winding where the number of slots per pole and per phase becomes an even number, required characteristics can be obtained in torque, current or the like.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Purpose of the Invention (Industrial Application Field) The present invention is directed to a method in which the number of slots for each pole and each phase is an even number, and the number of conductors in each slot is an odd number. This invention relates to a multiphase armature winding with two layers of overlapping winding.

(Prior art) The number of slots for each pole and each phase in the armature winding, the number of conductors in each slot, the winding coefficient, etc. are important factors that determine the output, voltage, torque, and other characteristics of a rotating electrical machine. . Therefore, when designing a rotating electric machine, these factors are appropriately selected to obtain desired characteristics, and the degree of freedom in design is determined by the range in which each factor can be selected.

By the way, generally, each wire ring constituting the armature winding is constructed by winding a conductor around an equal integer number of turns. Therefore, if the number of windings is n, the number of conductors on each side of the wire ring is equal to n on both the left and right sides, and when the armature winding is wound in two layers, the number of conductors in each slot is 2n. Generally, it is an even number.

However, if only an even number of conductors in the slot can be selected, the degree of freedom in design is small as described above, and there may be cases where desired characteristics cannot be obtained. Therefore, a winding configuration is being considered in which the number of conductors in each slot can be set to an odd number even in two-layer overlapping winding.

FIG. 8 shows an example of a conventional armature winding in which the number of conductors in each slot can be an odd number in a two-layer overlapping winding in which the number of slots in each pole and each phase is an even number. The figure shows 2
This is a wire ring arrangement diagram showing a three-phase electric element winding with poles and 24 slots. The symbols ○, open, and △ indicate the U phase, ■ phase, and W phase, respectively, and the numbers within each symbol indicate the wire ring. Indicates the number of conductors on the side. This armature winding is made into 2F[t wire rings with the number of turns of ``3'' and ``2''. Therefore, the number of conductors on the wire side of each wire is 3 and 2.
), the various wire rings are arranged alternately in the circumferential direction, and the wire ring side with 3 conductors and the wire ring side with 2 conductors are located in the same slot and in two layers. It is wrapped in layers. According to this, the number of slots for each pole and each phase is 4 (-24
/2X3), and the number of conductors in each slot is 5 (-3+2
) is an odd number, the degree of freedom in design increases accordingly and it becomes easier to obtain the required characteristics. Moreover, as shown in the figure, each winding group U1, U2, vl, V2, Wl, W2 all have the same number of conductors, 10 (-3+2+3+2), so even if they are connected in parallel for each phase, each phase Therefore, it is possible to cope with a voltage of 2 f-I, and the degree of freedom in terms of voltage is increased.

However, in such a winding system, the pitch of each wire ring is an odd number of 7 (for example, from the 1st slot to the 8th slot).
), this cannot be set to an even number. In order to set the coil pitch to an even number, for example 8, by making it span from the 1st slot to the 9th slot, the lower coils in the slot will be arranged in an arrangement in which they are moved one pitch at a time to the right in the diagram. This is because the number of conductors in each slot alternates between "6" and "4".

This means that the degree of freedom in selecting the winding pitch and thus the winding coefficient is small, and means that it may not be possible to achieve the required torque/current characteristics due to restrictions on the winding coefficient.

(Problems to be Solved by the Invention) In short, in the conventional armature winding, the degree of freedom in design is still small, and the number of conductors in the slot is Even if it is possible to make the number an odd number, even if it can handle multiple voltages, there remains a problem in that there are still constraints on the ring pitch.

The present invention has been made in order to eliminate the above two problems, and its purpose is to provide a two-layer winding in which the number of slots in each pole and phase is an even number, and the number of conductors in each slot is an odd number. To provide a multiphase armature winding in which the coil pitch can be set to an even number and the degree of freedom in winding coefficients can be increased even if there is a winding.

[Structure of the Invention] (Means for Solving the Problems) The multiphase armature winding of the present invention is a two-layer overlapping winding in which the number of slots for each pole and each phase is an even number, and each wire ring is positioned on both sides of the winding. The feature is that the coils are wound so that the sum of the number of conductors on the coil sides is an odd number, and the pitch of the coils is set to an even number.

(Function) Since the sum of the coil sides of each coil is an odd number, the number of conductors in each slot will be an odd number even if the coil pitch is an even number and two-layer overlapping winding is performed. In addition, since each winding group is composed of the same number of conductors, it is possible to handle multiple voltages by switching between series and parallel connections.

(Embodiment) A first embodiment of the present invention will now be described with reference to FIGS. 1 to 5.

Figure 1 shows a wire arrangement diagram of a 3-phase armature winding with 4 poles and 48 slots.
(-48/3X4) is a two-layer overlapping winding. The number of conductors in each slot is an odd number of 3 (=2+1). Now, each wire ring 50 has the form shown in FIG. 2(A) and is composed of one quarter turn of a conductor, so the number of conductors on one wire ring side 51 is 2.
, the number of conductors on the other wire ring side 52 is 1, and the sum of the number of conductors on each wire ring side is an odd number of 3 (-2+1). This wire ring 5
0, the state shown in FIG. 2(A) and the state shown in FIG. 2(B) by reversing the front and back sides are arranged alternately. In this case, the winding pitch is an even number 8. That is, when the pipe is opened to the U phase in Fig. 1, the upper layer of the slot number 1 and the lower layer of the slot number 9 are
) is arranged, and the wire ring 50 in the state shown in FIG. 1
The wire ring 50 in the state shown in FIG. 2 (A) is placed in the slot No. 1, and the wire ring 50 in the state shown in FIG. 2 (B) is placed in the slot No. 4 and the slot No. 12.
The wire rings 50 in the state shown in FIG. Therefore, number 1
The number of conductors in the upper layer of each slot of ~4 is 2.1,
2.1, and the number of conductors in the lower layer of each slot numbered 9 to 12 is 1°2.1.2 in order. Then, the wire ring 50 between slots numbered 1 and 9 and the wire ring 50 between slots numbered 2 and 10 are connected at point a in FIG. Wire ring 5 between slots 3 and 11
0 at the point in the same figure, and then connect the wire ring 50 between the slots numbered 3.11 and the wire ring 5 between the slots numbered 4.12.
0 is connected at point C in the figure. Thereby, the four wire rings 50 constitute a U-phase first winding group U1. Similarly, the U-phase second winding group U2 is arranged between the upper layer of each slot numbered 13 to 16 and the lower layer of each slot numbered 21 to 24 as shown in FIGS. ) The third winding group U3 of 14 is constructed by storing a total of four wire rings 50 of two types in the states shown in FIG. It consists of four wire rings 50, also with a slot pitch of 8, housed in the lower layer of each slot numbered 33 to 36.
The fourth winding group U4 of the phase is made up of four wire rings 50, also with a slot pitch of 8, housed between the upper layer of each slot numbered 37 to 40 and the lower layer of each slot numbered 45 to 48. It is configured. Further, the V-phase and W-phase windings are each composed of first to fourth winding groups V1 to V, W1 to W4, as shown in FIG.

In the armature winding having the above configuration, the sum of the number of conductors on each wire ring side of each wire ring 50 is an odd number of 3, so as shown in Figure 1, the number of slots for each pole and each phase is an even number. It is possible to make the coil pitch an even number even though it is a two-layer overlapping winding. Therefore, in this type of armature winding, the coil pitch could only be set to an odd number in the past, but in this embodiment, it can be set to an even number, which increases the degree of freedom in selecting the coil pitch and thus the winding coefficient. It increases. This makes it possible to obtain desired characteristics in terms of torque, current, etc.

Moreover, the number of conductors constituting each winding group of each phase, including the first to fourth winding groups U1 to U4 of U phase, is 12 (-3X
4) Since they are all equal, the electrical characteristics such as magnetomotive force and impedance of each winding group are approximately equal, and by connecting each winding group in parallel for each phase, a balanced armature winding is constructed. can do. By the way, in this connection state, the magnetomotive force waveform when a current corresponding to +1.0 flows through the U-phase winding and -0.5 through the V-phase winding and W444 winding is shown in Figure 4. It is clear that a well-balanced four-pole magnetomotive force distribution can be obtained. Further, the voltage vector is balanced as shown in FIG. In addition, in Fig. 5, 1 is used for clarity of the vector diagram.
Only the phase components are drawn, and here the length of the voltage vector Eat is twice the voltage vector Eb1 when the number of turns is 2:
This is because there is a relationship of 1. Furthermore, since the electrical characteristics of each winding group are equal, the first and second winding groups U1. Series circuit of U2 and third and fourth winding groups U 3 + U A
Even if these compatible series circuits are connected in parallel, a balanced armature winding can be created. Therefore, a total of three types of circuit configurations are possible, and if a voltage of 100V can be applied when all winding groups are connected in parallel, it is possible to configure a well-balanced armature winding. A voltage of 200V can be applied when two parallel circuits are configured, and a voltage of 400V can be applied when all winding groups are connected in series.

In other words, it is possible to deal with three types of voltages, and the degree of freedom in voltage selection is no inferior to that of the conventional method.

FIG. 6 shows a second embodiment of the invention. The difference from the first embodiment is that it has a 6-pole configuration with 36 slots, and each wire ring is wound two and a half times, so that the number of conductors on one wire ring side is 3 and the number of conductors on the other wire ring side is 2. It is in. Therefore, the number of conductors in each slot is 5 (-3 + 2), and the winding pitch is 4, which is an even number.
For example, two of the above-mentioned wire rings, which are reversed inside out, are arranged between the slots numbered 1.degree. 5 and between the slots numbered 2 and 6. In FIG. 6, the wire ring sides in slots numbered 19 to 36 are the same as those in slots numbered 1 to 18, and are therefore not shown. The voltage vector of the armature winding having such a configuration is as shown in FIG. 7 when only one phase is shown, and it is clearly balanced. Further, the ratio between the length of the voltage vector Ea2 and the length of the voltage vector Eb2 is 3=2 from the winding number ratio.

Note that the present invention is not limited to the above embodiments,
The present invention can be widely applied to multi-phase armature windings with double-layer overlapping windings in which the number of slots for each pole and each phase is an even number and the number of conductors in the slots is an odd number.

[Effects of the Invention] The present invention is as follows: - As explained above, since each wire is wound so that the sum of the number of conductors on each wire ring side located on both sides of the wire is an odd number, the number of slots for each pole and each phase is Even in double-layer winding where R is an even number and the number of conductors in the slot is an odd number, it is now possible to make the wire ring pitch an even number, which was previously difficult. As a result, characteristics such as torque and current can be set as desired. Moreover, since the total number of conductors is equal across all winding groups,
This has an excellent effect in that the electrical characteristics of each winding group are approximately equal, and the degree of freedom in voltage setting is increased due to connection loss of each winding group.

[Brief explanation of drawings]

1 to 5 show a first embodiment of the present invention, FIG. 1 is a wire arrangement diagram, FIGS. 2A and 2B are plan views showing the winding state of the wire, and FIG. FIG. 3 is a wire connection diagram, FIG. 4 is a magnetomotive force waveform diagram, FIG. 5 is a voltage vector diagram for one kettle, and FIGS. 6 and 7 are diagrams showing the second embodiment of the present invention. FIG. 5 is a diagram corresponding to FIG. 5, and FIG. 8 is a diagram corresponding to FIG. 1 showing a conventional armature winding. In the drawing, 50 is a wire ring, 51.52 is a wire ring side, U1 to U4
are the first to fourth line groups of Ukan.

Claims (1)

[Claims] 1. In a two-layer overlapping winding with an even number of slots per pole and each phase and an odd number of conductors in each slot, the sum of the number of conductors on each wire ring side located on both sides of each wire ring is A polyphase armature winding characterized in that the coils are wound in an odd number and the pitch of each coil is set to an even number.