RU2249290C1 - Composite stator winding of induction generator - Google Patents

Abstract

FIELD: electromechanical engineering; off-line power supplies built around induction generators with field capacitors.

SUBSTANCE: proposed composite stator winding has 18 coil groups. Finishing lead of coil group 1 is connected to starting lead of coil group 10; finishing lead of coil group 3, to starting lead of coil group 12; finishing lead of coil group 5, to starting lead of coil group 14; finishing lead of coil group 7, to starting lead of coil group 16; finishing lead of coil group 9, to starting lead of coil group 18; finishing lead of coil group 11, to starting lead of coil group 2; finishing lead of coil group 13, to starting lead of coil group 4; finishing lead of coil group 15, to starting lead of coil group 6; finishing lead of coil group 17, to starting lead of coil group 8. Star constituting leads are taken from starting leads of coil groups 3, 9, and 15. Additional delta-constituting leads are taken from integrated finishing leads of coil groups 4, 6, 8, from integrated finishing leads of coil groups 10, 12, 14, and from integrated finishing leads of coil groups 16, 18, 2; from integrated starting leads of coil groups 5, 7, from integrated starting leads of coil groups 11, 13, and from integrated starting leads of coil groups 17, 1. Field capacitors are connected to winding star or delta depending on desired voltage across generator output. In this way different voltages can be obtained across generator output at constant speed of drive motor.

EFFECT: enlarged functional capabilities of induction generator.

1 cl, 8 dwg

Description

The invention relates to electrical engineering and can be used to create autonomous sources of electricity.

Known stator windings of asynchronous machines, consisting of coil groups evenly distributed in phases (Series 4A asynchronous motors: Reference book / A.E. Kravchik, M.M.Shlaf, V.I. Afonin, E.A.Sobolenskaya. - M .: Energoizdat, 1982, USSR AS No. 1046861. Pole-switchable winding, N 02 K 17/14, 3/28, 1981).

A disadvantage of the known windings is that in asynchronous generators, autonomous sources of electricity with a fixed speed of the drive motor, they create a voltage of only one magnitude.

Known stator winding of an asynchronous machine, consisting of 18 coil groups, in which the ends k and k + 9 of the coil groups are combined in pairs, are combined at the zero points of the beginning of 4, 6, 8 coil groups, the beginning of 10, 12, 14 coil groups and the beginning of 16 , 18, 2 coil groups, the conclusions are taken from the beginnings of 2k-1 coil groups (k = 1,2,3, ..., 9) (Patent RU 2149491. Pole-switched winding for 10/6 poles Н 02 К 17/14, 3/28, 1999 - prototype).

The disadvantage of the winding is that in the generators of autonomous sources of electricity with a fixed speed of the drive motor, it creates a voltage of only one magnitude.

The technical solution to the problem is to expand the functionality of the winding and obtain various output voltages of the asynchronous generator at a constant speed of the drive motor.

The solution of this problem is achieved by the fact that in the static combined winding of an asynchronous generator containing 18 coil groups with the first conclusions from the beginnings of 3, 9, 15 coil groups making up the “star”, the end of 1 coil group is connected to the beginning of 10 coil group, the end of 3 s beginning 12, end 5 with beginning 14, end 7 with beginning 16, end 9 with beginning 18, end 11 with beginning 2, end 13 with beginning 4, end 15 with beginning 6, end 17 with beginning 8, the winding has second conclusions, constituting a “triangle” and formed from the combined ends of 4, 6, 8 reel groups, from the combined ends of 10, 12, 14 coil groups, from the combined ends of 16, 18, 2 coil groups, the third conclusions that are formed from the combined beginnings of 5 and 7 coil groups, from the combined beginnings of 11 and 13 coil groups and from the combined beginnings 17 and 1 of the coil groups and field capacitors connected in accordance with the required mode of the output voltage of the generator to the corresponding terminals of the winding.

The novelty of the claimed technical solution is due to the fact that to expand the functionality of the winding and obtain various output voltages of the asynchronous generator, the winding of 18 coil groups has second leads that make up the “triangle” and are taken from the combined ends of 4, 6, 8 coil groups, from the combined ends 10, 12, 14 coil groups, from the combined ends of 16, 18, 2 coil groups, the third conclusions are formed from the combined principles of 5 and 7 coil groups, from the combined principles of 11 and 13 coil groups and from the combined started 17 and 1 coil groups and field capacitors, which can be connected to the “star” or “triangle” of the winding to ensure the required mode.

According to the scientific, technical and patent literature, the authors do not know the claimed combination of features aimed at achieving the task, and this solution does not follow clearly from the prior art, which allows us to conclude that the solution corresponds to the level of the invention.

The proposed technical solution is industrially applicable, since a prototype of an asynchronous generator is made and tested in laboratory conditions for use in industry.

The invention is illustrated in the drawing, where figure 1 shows a diagram of a winding in a single layer design; figure 2 - the direction of the currents in the sides of the coils; figure 3 shows the form of the magnetomotive force of a single-layer winding; figure 4 shows a diagram of the winding in a two-layer design; figure 5 - the direction of the currents in the sides of the coils of the two-layer winding; figure 6 shows the form of the magnetomotive force of a two-layer winding; in Fig.7 shows the inclusion circuit of the capacitors; on Fig shows a diagram for calculating the magnitude of the lower voltage.

According to figure 1 and figure 4, the winding consists of 18 coil groups with conclusions 19, 20, 21, 22, 23, 24, 25, 26, 27 connected to the excitation capacitors 28, 29, 30. In this case, the end 1 of the coil group connected to the beginning of the 10th coil group, end 3 with the beginning of 12, end 5 with the beginning of 14, end 7 with the beginning of 16, end 9 with the beginning of 18, end 11 with the beginning of 2, end 13 with the beginning of 4, end 15 with the beginning of 6, end 17 with beginning 8, conclusions 20, 23, 26 constituting the “star”, taken from the beginnings of 3, 9 and 15 coil groups, additional second conclusions 21, 24, 27, constituting the “triangle”, taken from the combined ends 4, 6 8 ka carcass groups, from the combined ends of 10, 12, 14 coil groups, from the combined ends of 16, 18, 2 coil groups, the third conclusions 19, 22, 25 are taken from the combined beginnings of 5 and 7 coil groups, from the combined beginnings of 11 and 13 coil groups and from the combined beginnings of 17 and 1 reel groups. Excitation capacitors 28-30 in accordance with the required mode of the output voltage of the generator can be connected to the corresponding terminals of the winding.

The stator combined winding of an asynchronous generator can be made both single-layer or double-layer.

According to figure 2 and figure 5 (the sides of the coils of phase A are indicated by a square, phase B by a triangle and phase C by a circle), the incoming current is indicated by a "plus", the output current is indicated by a "point". Magnetomotive forces point to 8 poles of the winding. The winding coefficient of a single-layer winding k _ob = 0.945, and the winding coefficient of a two-layer winding k _ob = 0.89 provide a high degree of utilization of the size of the basic asynchronous machine. Capacitors are connected to the "star" - conclusions 20, 23, 26 or to the "triangle" - conclusions 21, 24, 27 (Fig.7).

With a conventional unit of voltage between terminals 22 and 27, the voltage ratio between terminals 20 and 23, 24 and 27, 22 and 25 is 3.732 / 2 / 0.684 (Fig. 8).

The stator winding of an asynchronous generator operates as follows.

During the rotation of the rotor of the asynchronous generator due to the residual magnetization and excitation capacitors, the process of self-excitation occurs. Voltage appears on all pins. A load with a supply voltage of 380-400 V can be connected to conclusions 20, 23, 26, a load with a supply voltage of 220-230 V can be connected to terminals 21, 24, 27, and a welding rectifier can be connected to conclusions 19, 22, 25.

Thus, the proposed winding of an asynchronous generator allows the manufacture of a multi-purpose power source.

Claims (1)

The stator combined winding of the asynchronous generator, containing 18 coil groups with the first conclusions from the beginnings of the 3rd, 9th, 15th coil groups making up the “star”, characterized in that the end of the 1st coil group is connected to the beginning of the 10th coil group, the end of the 3rd - with the beginning of the 12th, the end of the 5th - with the beginning of the 14th, the end of the 7th - with the beginning of the 16th, the end of the 9th - with the beginning of the 18th, the end of 11- th - with the beginning of the 2nd, the end of the 13th - with the beginning of the 4th, the end of the 15th - with the beginning of the 6th, the end of the 17th - with the beginning of the 8th, while the winding has the second conclusions that make up “ triangle ”, formed from the united the ends of the 4th, 6th, 8th coil groups, from the combined ends of the 10th, 12th, 14th coil groups, from the combined ends of the 16th, 18th, 2nd coil groups, third conclusions, which are formed from the combined principles of the 5th and 7th coil groups, from the combined principles of the 11th and 13th coil groups and from the combined principles of the 17th and 1st coil groups, and field capacitors connected to in accordance with the required mode of the output voltage of the generator to the corresponding conclusions of the winding.

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