JPH0417021B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an armature winding having four or more poles in which at least one phase is connected in parallel or substantially in parallel, and which can sometimes shorten the length of the crossover wire. It is related to. The armature winding of a three-phase induction motor is often operated with a 2Y connection as shown in FIG. 1 or a 2Δ connection as shown in FIG. In such a case, the conventional four-pole armature winding was constructed as shown in FIG. In other words, 1 to 36 are slots, and U indicated by a thick solid line
is a U-phase winding, V indicated by a thick dotted line is a V-phase winding, and W indicated by a thick two-dot chain line is a W-phase winding. Also u ₁ ,
u ₂ , v ₁ , v ₂ , w ₁ , and w ₂ are lead wires of the U-phase, V-phase, and W-phase windings. When these output lines u ₁ to w ₂ are connected as shown in FIG. 1, it becomes 2Y, and when they are connected as shown in FIG. 2, it becomes 2Δ. By the way, the wire rings c ₁ , ₃ (hereinafter, the wire rings are indicated by c and the slot number in which the wire fits), c ₁₉ , ₂₆ , c ₁₀ ,
₁₇ , and C ₂₈ , ₃₅ , C ₇ , ₁₄ and C ₂₅ , ₃₂ , C ₁₆ , ₂₃ and C ₃₄ , ₅ , C
₁₃
and C ₂₀ , and C ₂₂ , ₂₉ and C ₄ , ₁₁ are crossover wires ua, ub, va,
Connections must be made with VB, WA, and WB, but the length of the conventional crossover wire is extremely long, as is clear from Figure 3. The potential difference between the crossover wires and between the crossover wire and the coil end is quite high, so the crossover wires must be well insulated. Therefore, the longer the crossover wire, the more difficult the insulation work. Naturally, a large amount of conductor material and insulating material will also be required. Furthermore, the volume of the coil end increases, causing problems such as the cooling efficiency of the coil end not increasing as expected. In addition, JP-A-51-59301 has a number of poles that is a multiple of 6, and the number of parallel circuits is one-third of the number of poles.
In addition, the number of grooves in one pole and one phase is an odd number of 3 or more, and among the odd number of grooves, the outer coil of the pole adjacent to the central groove is housed in a concentric armature winding connection configuration. An armature winding is disclosed that minimizes the voltage between the entering coils. A common lead line is disclosed that extends from both adjacent train wheel groups. However, although the length of the crossover wire is certainly shortened, no consideration is given to the winding order of the wire ring group, and the winding order is not the same along the circumferential direction. If the winding order of the wire ring group is not the same along the circumferential direction, the winding device becomes complicated, and there are problems in that the number of errors in operation increases and the working time increases. The present invention has been made in view of these points, and its purpose is to shorten the crossover wires of the armature windings, and at the same time change the winding order of each wire ring group in the circumferential advancing direction of the armature. The purpose is to enable continuous winding in the same order along the . For this reason, in the present application, the number of poles is 4 or more, each phase is composed of the same number of wire loops as the number of poles, and the wire loops are wound continuously in series with other adjacent wire loop groups. 2 with the same number of groups
In an armature winding constructed by connecting two series circuits in parallel, the adjacent wire rings of the same phase have opposite polarities, and the wire ring with the smallest straddle and the wire ring with the most straddle are Connecting wires are connected from both ends of each of the two series circuits, and one end of the connecting wire is connected as a common lead wire from an adjacent part adjacent to the other series circuit. , one of the connection wires taken out as the common output line is taken out from the slot containing the wire with the largest straddle among the wire ring groups, and the other is taken out from the slot containing the wire with the largest straddle among the wire ring groups. It is constructed so that it is ejected from a slot containing a small wire ring. As described above, according to the configuration of the present invention, of the two connecting wires coming out as a common lead wire from adjacent parts of the series circuit, one of the connecting wires is always continuous and constitutes the same phase. The wire can be taken out from the slot containing the wire that spans the longest, and the other wire can be taken out from the adjacent part of the adjacent wire group, so the length of the crossover wire can be reduced. Can be shortened. Moreover, one connecting wire can be connected to the other wire without crossing it. Further, each group of wire rings can be wound in succession so that the winding order is the same along the circumferential direction of the armature. The other end of the connecting wire of the parallel circuit can provide a common lead wire serving as a neutral point. However, in the case shown in Figure 4, even if the two terminals of each phase that serve as the neutral point are not connected in common, the wire groups belonging to the same phase are in a parallel relationship, and when viewed as a whole, and 2Y. With this configuration, the connecting wires of the lead wires are shortened, improving insulation treatment, and at the same time, the winding order of each wire ring group is the same along the circumferential direction of the armature. It can be wound continuously. That is, the winding device can wind each wire ring group in a repetitive motion along the traveling direction, and therefore the winding device does not become complicated. Furthermore, since there is no need to turn back and wind or change the order, the winding work is not complicated and it is possible to prevent the occurrence of defective products due to incorrect work. Furthermore, winding work and insulation treatment work are simplified, which has the effect of shortening work time. FIG. 5 is a developed view of a 4-pole, 36-slot, three-phase armature winding showing an embodiment of the present invention. This example will be explained below. Each wire ring group and group are configured as shown in Table 1.

[Table] Now looking at the adjacent groups, G ₁ and G ₂ ,
The first terminals tua, ₁ and ₂ are connected to the wire groups g ₁₂ and g ₂₁ belonging to the adjacent positions of both groups G 1 and G 2, respectively.
Take out the tub and connect these to the first terminal tua and tub.
Connect with ua′. Also, the other second terminal tuc, tud
are commonly connected by a crossover wire ub′, and both groups G ₁ and G ₂ are connected in parallel. Let the output lines be u ₁ and u ₂ . In other words, the common lead wire u1 is connected to the slot 17 in which the wire rings constituting the same phase are continuously inserted.
It comes from 17 and 19 out of 18 and 19. The above is the U-phase winding, but the V-phase winding has the same structure as the U-phase winding, electrically shifted by 120 degrees, and the W-phase winding is shifted further by 120 degrees. And overall the fifth
If the device is configured as shown in the figure and connected to a three-phase AC power source as shown in FIG. 1 or 2, a rotating magnetic field will be generated. Note that the arrows shown in the U-phase windings in FIG. 5 indicate the direction of current flowing through each wire at a certain point in time. As is clear from this, adjacent linear ring groups g ₁₁ to _{g 22} exhibit polarities in different directions. It is clear that the lengths of the connecting wires ua' to wb' shown in FIG. 5 are shorter than those of the conventional one shown in FIG. 3, and there is less overlap.

[Brief explanation of drawings]

Figures 1 and 2 are diagrams showing the connection state of the armature windings, Figure 3 is an exploded view of a conventional three-phase four-pole armature winding, and Figure 4 is the connection shown in Figure 1 and the actual connection. FIG. 5 is a developed view of a three-phase armature winding showing an embodiment of the armature winding of the present invention. U, V, W are each phase winding, M is the main winding, A is the auxiliary winding, u ₁ , u ₂ , v ₁ , v ₂ , w ₁ , w ₂ are the lead wires, tua,
tub, tva, tvb, twa, twb are the first terminals, tuc,
tud, tvc, tvd, twc, twd are the second terminals, Ua′,
Ub′, Va′, Vb′, Wa′, and Wb′ are crossover wires.

Claims (1)

[Claims] 1. The number of poles is 4 or more, each phase is composed of a group of wire wheels of the same number as the number of poles, and the wire ring is continuously wound in series with the other adjacent wire ring group. In an armature winding constructed by connecting two series circuits having the same number of groups in parallel, the adjacent wire ring groups of the same phase are arranged so that they have opposite polarities and have the smallest straddle. The wire loops and the wire loop that spans the largest distance are connected in succession, and connecting wires are taken out from both ends of each of the two series circuits, and one end of the connecting wires is connected to a common wire from an adjacent part adjacent to the other series circuits. One of the connection wires taken out as a lead wire and the common lead wire is taken out from the slot containing the wire ring with the largest straddle among the wire ring groups, and the other one is taken out from the slot containing the wire ring with the largest straddle among the wire ring groups. An armature winding characterized in that the armature winding is configured to be taken out from a slot containing a wire ring with the smallest straddling of the group. 2. The wire ring group is composed of one wire ring or a plurality of concentrically wound wire wheels, and the wire ring group composed of the one wire ring has a wire ring with the smallest straddle and a wire ring with the largest straddle. The armature winding according to claim 1, characterized in that the armature winding is common.