CN2694595Y - Modified structure for AC generator - Google Patents

Abstract

The utility model discloses a modified structure for an AC generator, consisting of a stator and a rotor. The coil end of the stator coil extending out of the end surface of an iron core is arranged in the position close to pi / 2 of an outgoing line slot position, and an underlayer coil is rolled over and is embedded in an upper layer coil in the position close to pi / 2 of an ingoing line slot position, according to which all coils are embedded. No interference is in the coil ends, and the height of the end of winding is shortened, namely the blind area in the slot of the iron core is eliminated and the tankful rate is increased. Additionally, each coil of the stator of the utility model is respectively formed, and the method of line embedding along the axial direction of the iron core effectively weakens magnetic vibration force.

Description

The improvement structure of alternating current generator

Technical field

The utility model relates to a kind of generator, particularly relates to a kind of improvement structure of alternating current generator.

Background technology

The stator winding of alternator for vehicle generally selects for use winding coefficient whole preferably apart from winding, and the π pitch rule that equates with pawl utmost point pole span of employing.Because be three phase windings, the phase difference of each phase is 2 π/3, so, each phase winding must overlapping π/3, (shown in Figure 1A-1D) specifically, because need a lot of coils 1 ' are embedded unshakable in one's determination 2 ' from interior round side successively, so the coil 1 ' that inserts earlier has overlapping with the coil 1 ' that insert the back.As a result, will occur dead band 3 ' shown in Figure 1 in the groove 22 ' or claim the neutral zone, this district has hindered the increase of winding conducting wire sectional area.In addition, between the lap lead, produce contact stress, need to guarantee that will there be enough length coil 1 ' end, the elongated increase that causes stator winding resistance of whole winding.Can represent the situation of lead in stator coring groove behind the rule with copper factor, as shown in the formula expression

Copper factor=A ₁/ A ₂

In the formula: A ₁--the total sectional area of electric wire in the stator coring groove;

A ₂--the sectional area of stator coring groove.

In the last few years, the evolving state of copper factor (as shown in Figure 2), as can be seen from Figure 2, though several times improve, the raising of copper factor has been bordering on the summit.In order to reduce the internal resistance of winding, even want to shorten the length of winding, increase the sectional area of winding conducting wire, but aforesaid winding overhang overlapping become insoluble problem.In order to reduce magnetic vibration power, traditional method is to produce 2 covers, three phase windings of reaction magnetomotive force 6 subharmonic respectively with 30 ° phase difference rule, the reaction magnetomotive force that both are produced is cancelled out each other, to reach the purpose (shown in Fig. 3 A-3D) of taking measures to reduce noise in the generation source.With regard to traditional winding, adopt 2 covers, three phase windings, it is complicated that structure just becomes, and further aggravated the overlapping of end winding, and the characteristic of generator might degenerate also; But, just can improve the performance of generator and can reduce magnetic noise in case adopted non-overlapping rule mode of end coil and 2 covers, three phase windings.If want to realize that with continuous rule mode the zero lap rule is unusual difficulty, this be because, the traditional approach rule is from interior circle one side insertion winding, so, could embed only less than width of rebate than thin wire.

The utility model content

The purpose of this utility model is to provide the improvement structure of a kind of tankful rate height, alternating current generator that magnetic vibration power is little.

For achieving the above object, technical solution of the present utility model is:

The utility model is a kind of improvement structure of alternating current generator, and it comprises stator and rotor.Described stator coil stretches out the end winding of end face of iron core, goes out wire casing pi/2 place in distance, and the inner coil upset embeds upper coil at distance inlet wire groove pi/2 place.

Described winding wire is a flat type copper wire.

The moulding respectively of described each coil, making can be from the axial shape of inserting iron core.

Described coil shape is the U font, and is outwardly-bent in the end of two open end arms of this U font coil.

The pawl number of described rotor is 7 or 8.

After adopting such scheme,, that is, stretch out the end winding of end face of iron core at described U font coil, apart from going out wire casing pi/2 place, the inner coil upset because the utility model stator adopts double-deck span; Embed upper coil at distance inlet wire groove pi/2 place.With all coils of this embedding, end winding is not interfered each other, and can shorten the height of winding overhang, promptly can eliminate the dead band in the core slots, and tankful rate improves greatly, can reach 70% (seeing table 1 for details).In addition, each coil of the utility model stator moulding respectively, the rule mode from the axial insertion of iron core effectively reduces magnetic vibration power.

Result's contrast of 2 kinds of windings of table 1

Project	Copper factor	Tip lengths
			Traditional generator the utility model stator winding generator	45％-75％ 70％	100％ 70％

Below in conjunction with the drawings and specific embodiments the utility model is further described.

Description of drawings

Figure 1A-1D commonly uses stator winding end winding schematic diagram;

Fig. 2 is the differentiation situation of tankful rate;

Fig. 3 A-3D is the 2 cover three-phase winding construction figure that commonly use;

Fig. 4 is the utility model stator coil end figure;

Fig. 5 is the structural representation of the utility model stator coil;

Fig. 6 is the utility model U font coil and installation diagram unshakable in one's determination;

Fig. 7 is the utility model U font coil connection layout;

Fig. 8 is the utility model U font coil windings assembling schematic diagram;

Fig. 9 is the size and the weight comparison diagram of traditional generator and the utility model generator;

Figure 10 is traditional generator and the utility model generator output characteristic comparison diagram;

Figure 11 is traditional generator and the utility model generator efficiency comparison diagram;

Figure 12 is traditional generator and the utility model generator electromagnetic noise comparison diagram;

Figure 13 is the front view of the utility model rotor.

Embodiment

As shown in Figure 6, the utility model is a kind of improvement structure of alternating current generator, and it comprises stator and rotor.The lead of the coil 1 of the utility model stator adopts flat type copper wire, this each coil 1 moulding respectively, and being made into can be from axial unshakable in one's determination 2 the U glyph shape (this coil 1 also can be made into other can from the shape of the iron core 2 of axial insertion) of inserting.

As shown in Figure 7, the end of two open end arms 11 of this U font coil 1 forms outwardly-bent shape after bending.

As Fig. 7, shown in Figure 8, the end winding 15 that each U font coil 1 is stretched out 2 end faces unshakable in one's determination bends, and the end 12 of the open end arm 11 of each U font coil 1 is linked together by special welding procedure in twos, wholely will form stator winding 10.In order to ensure the insulation property of connecting portion, need carry out insulation processing.In when coiling, a cover U font coil 1 repeatedly put arrangement after, just can be from the axial groove that inserts iron core 2.

As Fig. 4, shown in Figure 5, the utility model stator adopts double-deck span,, stretches out the end winding 15 of 2 end faces unshakable in one's determination at described U font coil 1 that is, apart from the pi/2 place that goes out wire casing 21, and inner coil 13 upsets; Pi/2 place at distance inlet wire groove 22 embeds upper coil 14.With all coils 1 of this embedding, end winding 15 is not interfered each other, and can shorten the height of winding overhang, promptly can eliminate the dead band in 2 grooves unshakable in one's determination.

As shown in Figure 6, utilize the generator of the utility model technology manufacturing to compare with traditional product, new type electric generator all is improved on projects such as external diameter, total length and quality.And performance also is improved, and promptly as shown in Figure 7, because the reduction of stator winding internal resistance and the improvement of heat dispersion are compared with traditional type product, the generator output under the engine idle has improved 50%.

From efficient, as shown in Figure 8, because the reduction of stator winding internal resistance, the copper loss during generating reduces significantly, and improvement unshakable in one's determination and reduced iron loss, compares with traditional product, and the absolute value of efficient has improved 10%.

The contrast of electromagnetic noise as shown in Figure 9, by configuration phase differ 30 ° 2 the cover windings, compare with traditional product, magnetic noise has reduced 10dB; In addition, heat dispersion also is improved.In general, can save fuel oil 2% approximately every year.

As shown in figure 13, the pawl number of the described rotor that cooperates with stator in the utility model is 7 or 8.

Claims (5)

1, a kind of improvement structure of alternating current generator, it comprises stator and rotor; It is characterized in that:

The coil of described stator stretches out the end winding of end face of iron core, goes out wire casing pi/2 place in distance, and the inner coil upset embeds upper coil at distance inlet wire groove pi/2 place.

2, the improvement structure of alternating current generator according to claim 1 is characterized in that:

Described winding wire is a flat type copper wire.

3, the improvement structure of alternating current generator according to claim 1 is characterized in that:

The moulding respectively of described each coil, making can be from the axial shape of inserting iron core.

4, the improvement structure of alternating current generator according to claim 1 is characterized in that:

Described coil shape is the U font, and is outwardly-bent in the end of two open end arms of this U font coil.

5, the improvement structure of alternating current generator according to claim 1 is characterized in that:

The pawl number of described rotor is 7 or 8.

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