JPH0564013B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention combines two-layer winding, which requires an insulating member between the upper and lower coils, and single-layer winding to form concentric winding, and improves electrical characteristics and productivity. , relates to a three-phase armature winding in which it is easy to insert an insulating member between upper and lower coils.

[Technical background of the invention and its problems]

Three-phase armature windings generally have the same number of conductors in each slot if the power supply is balanced. However, since the number of conductors is small in large capacity models, pole change motors, etc., the number of conductors in the slot may vary by increasing or decreasing the number of conductors by about one conductor.

Generally, in the case of three-phase armature windings used in small capacity induction motors, the means for accommodating the conductors in the slots is as follows:
In consideration of recent mechanization, single-layer winding is often used, but considering harmonic components, it is not limited to single-layer winding, and may be mechanically wound with two layers.

However, in the case of two-layer winding, it may be necessary to insert an insulating member between the upper and lower coils depending on the winding configuration, power supply voltage, voltage of the adjacent conductor in the slot, surge voltage, etc.

As shown in FIG. 5, a sheet-shaped insulating member 51 is generally inserted as the insulating member between the upper and lower coils. In this figure, 52 is a slot, 53 is a U-shaped insulator, 54 is a winding conductor, and 5 is a U-shaped insulator.
5 is a wedge insulator. A case of single-layer winding which does not require an insulator between the upper and lower coils is shown in FIG. Both slots 52 generally have the same shape, and are generally distributed and mixed on the inner diameter side of the cylindrical stator core.

Now, as a means to help reduce size and weight,
In addition to reducing the voltage between adjacent conductors in the slot 52 and making the inter-coil insulating member 51 lighter and thinner, the increase in the space factor of the conductor 54 in the slot 52 is also a contributing factor. Furthermore, there is a demand for electric motors that are smaller, lighter, and less expensive, and reductions in material costs due to size reduction and reduction in manufacturing man-hours are also becoming important issues.
Therefore, the relationship between high space factor and manufacturing man-hours is
As shown in the figure, as the space factor increases, 2
The number of manufacturing steps increases in a curved manner, and these are contradictory requirements.

Figure 8 shows a development diagram for one phase of a conventional example, and the number of turns of the wire ring is expressed by the numbers in parentheses, and 1 to 36 represent the slot numbers, and in this example 4 is shown. This is the case of a concentric winding with 36 slots.
Examples of insulation configurations are similar to those in FIGS. 5 and 6. That is, the outer 20-turn coil is a two-layer winding with an insulating member 51 inserted between the upper and lower coils, and the inner 40-turn coil is a single-layer winder.

FIG. 9 is a voltage vector diagram in the case of FIG. 8, and the winding coefficient is 95.9795%. Figures 8 and 9
In the case of the conventional example shown in the figure, the number of turns of the wire ring on the outside and inside is different, but the number of conductors in the slot is the same for all slots, the effective slot cross-sectional area changes, and the two-layer winding has a different number of turns. The space factor is higher than that of the single-layer winding, and the manufacturing man-hours are not the same as shown in Figure 7, or in extreme cases, it is impossible to insert the insulating member 51 between the upper and lower coils as shown in Figure 1. There are cases.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a three-phase armature winding that facilitates the insertion of an insulating member between the upper and lower coils, reduces the number of manufacturing steps, is electrically balanced, and has the same characteristics as conventional windings.

[Summary of the invention]

In the present invention, two-layer winding slots that require an insulating member between the upper and lower coils and single-layer winding slots that accommodate single-layer windings are mixed, and three-phase armature windings are arranged concentrically in these slots. For wires, the number of winding conductors in the two-layer winding slot is three or more fewer than the number of winding conductors in the single-layer winding slot to make it easier to insert the insulating material between the upper and lower coils, and to reduce the conductor occupancy in each slot. This makes it easier to insert the insulating member between the upper and lower coils.

[Embodiments of the invention]

Example 1 A first example of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, this winding is a concentric winding with 4 stations and 36 slots, the solid line is the U-phase coil, the broken line is the V-phase coil, and the dashed line is the W-phase coil. Coil pitch is #1-#10 for large coils, #2- for small coils.
#9 concentric winding, #1 slot is double layer winding,
#2 and #3 slots are single layer winding. Although it is similar to FIG. 8 explained in the conventional example, the number of winding conductors of the large coil is 18, which is two fewer than the conventional 20, and the insulating member 51 between the upper and lower coils is inserted for that amount. It's easy. The number of conductors in the slot at this time is 36
become individual. And the number of winding conductors of a small coil is
The number is 42, two more than 40, improving the space factor. The V, W, and U phases have the same configuration, but the electrical angles are shifted by 120 degrees, so the supermagnetic force vectors are balanced and the supermagnetic force waveform is well-balanced, as shown in Figure 2. Each phase current in Fig. 2 is
This is when the U phase is +1.0 and the V and W phases are both -0.5.

This improves the space factor, facilitates the insertion of the insulating member between the upper and lower coils, improves productivity, and provides a three-phase armature winding that is electrically balanced and has the same characteristics as conventional ones. be able to. still,
The winding coefficient in this example is 0.9598.

Embodiment 2 Next, a second embodiment will be described with reference to FIGS. 3 and 4. This is different from Example 1 in the coil pitch; the large coil is #1-#9, and the small coil is #2.
- #8, in which the small coil was intended to overlap with the small coil of the other phase. That is, #1 slot has a single layer winding and 42 conductors, and #2 slot has a small coil winding in two layers and contains 36 conductors.

In this way, the same effects as in the first embodiment can be obtained, except that the winding coefficient is 0.9452.

It is better to make a difference of three or more conductors in the slots between the single-layer winding and the two-layer winding, since this makes it easier to insert the insulating member between the upper and lower coils.

〔Effect of the invention〕

The number of conductors in the slots of the armature winding is reduced in the two-layer winding part to make it easier to insert insulation material between the upper and lower coils, and increased in the single-layer winding part to equalize the conductor space factor and reduce manufacturing man-hours. , excellent insulation performance,
It is possible to provide a three-phase armature winding that is electrically balanced and has a large degree of freedom in design (by appropriately changing the winding coefficient).

[Brief explanation of the drawing]

Fig. 1 is a coil arrangement diagram showing a first embodiment of the three-phase armature winding of the present invention, Fig. 2 is a supermagnetic force waveform diagram of Fig. 1, and Fig. 3 is a coil arrangement diagram of the second embodiment. figure,
Figure 4 is a diagram of the supermagnetic force waveform in Figure 3, Figure 5 is a cross-sectional view of the slot portion of the two-layer coil, Figure 6 is a cross-sectional view of the slot portion of the single-layer coil, and Figure 7 corresponds to the space factor. FIG. 8 is a coil layout diagram showing one phase of a conventional winding, and FIG. 9 is a voltage vector diagram of each phase of the winding shown in FIG. 1 to 36...Slot number, number in parentheses...
... Number of winding conductors, 51 ... Insulating member between upper and lower coils,
52...Slot.

Claims (1)

[Claims] 1 In a three-phase armature winding that has a two-layer winding slot that requires an insulating member between the upper and lower coils and a single-layer winding slot that accommodates a single-layer winding, and is arranged concentrically in these slots, 2 The number of winding conductors in the layer winding slot is 3 or more less than the number of winding conductors in the single layer winding slot to make it easier to insert an insulating member between the upper and lower coils, and to approximate the conductor space factor in each slot. A three-phase armature winding characterized by: