UA147772U - THREE-PHASE WINDING OF SYNCHRONOUS ELECTRIC GENERATOR FOR HIGH POWER WIND INSTALLATIONS - Google Patents

Abstract

The three-phase winding of a synchronous electric generator for high-power wind turbines is a phase winding made of large cross-section tires, which are located in three tiers and enclosed in stator grooves, according to the utility model, each phase winding is one continuous conductor made in the form of a meander. which wraps around the teeth of the stator.

Description

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The useful model belongs to the electric power industry, in this case - to the windings of electric machines.

Known windings of electric machines, described in the work of G.K. Gervais "Windings of electric machines". - L.: Znergoatomizdat, Leningrad. otd-nie, 1989. - 400 s The windings of electric machines are depicted schematically, which allows us to judge their construction, electrical and electromagnetic properties.

In this paper, on page 60, a three-phase current winding with front parts in two tiers is shown (see Fig. 2.11). In the past, such a modification was widely used for the stator windings of large machines, but today, if such a design is found, it is mainly found in two-pole machines of small power.

The disadvantages of such a winding, if used in wind turbines, include the following: the use of these windings is possible only in machines with a small number of poles; with an odd number of grooves per pole and phase, such a winding is unsuitable. Wind turbines made according to the gearless scheme are distinguished by a low speed of rotation of the generator, which is due to the characteristics of the rotor. As the power of the wind turbine increases, the angular velocity of the rotor decreases. So, for example, in a wind turbine with a capacity of 600 kW (diameter 48 m) at a wind speed of 12.5 m/s, the rotation frequency is 23 rpm, and already in a turbine Epgop M/ipa 3.6 with a capacity of 600 kW (diameter 100 m ) at a wind speed of 15 m/s, the rotation frequency does not exceed 15.3 rpm. This means that at a given voltage frequency in the network (50Hz), this fact necessitates an increase in the number of poles. With an odd number of grooves per pole and phase, such a modification is in principle possible, but extremely inconvenient and therefore practically not used, and in wind generators, an odd number of grooves per pole and phase is expedient to reduce the pulsations of the electromagnetic moment and, accordingly, the voltage at the output.

A significant disadvantage of such a winding is the overlap of sections in the frontal parts of the winding, which in high-power machines is made from a tire in order to increase the filling factor of the grooves and, accordingly, increase the power of the generator, which significantly increases the size of the frontal part of the generator and, accordingly, the generator itself.

As the closest analogue, the winding given in the work of H.K. Gervais "Windings of electric machines". - L.: Znergoatomizdat, Leningrad. otd-nie, 1989. - 400 p. on page 61 and

It is shown in fig. 2.12. This three-phase current winding consists of sections with a large cross-section of conductors, which are located, including the frontal parts, on three tiers, which allows to exclude the overlapping of sections in the frontal parts. But due to the fact that the winding is made from separate sections made of conductors in the form of a bus with a large section, followed by their connection in the frontal parts to obtain a continuous winding, the problem of their connection arises.

The useful model is based on the task of creating a multiphase winding of an electric generator for a high-power wind turbine from conductors in the form of a large cross-section bus, in which each phase is not a group of sections with their subsequent connection into a winding, but one continuous conductor to eliminate the need for connection sections, simplification of winding production, reduction of ohmic losses in the winding. That is, the task comes down to simplifying the circuit and winding manufacturing technology.

The task is solved by the fact that the three-phase winding of a synchronous electric generator for high-power wind turbines is a phase winding made of large-section busbars, which are located in three tiers and are placed in the slots of the stator, according to a useful model, each phase winding is one continuous conductor , which is made in the form of a meander that goes around the teeth of the stator.

The common features with the closest analogue are that the three-phase winding of a synchronous generator for high-power wind turbines is three-phase windings made in the form of a bus with a large section, which are placed in three tiers.

Distinguishing features are that each phase winding is one continuous conductor in the form of a meander.

The essence of the useful model is explained by the drawings, where in fig. 1 shows the general view of the generator; in fig. 2 - diagram of the arrangement of three phase windings in the slots.

In fig. 1 shows the general view of the generator of the three-phase synchronous generator of increased power, consisting of the stator I and the rotor II. Excitation is carried out by permanent magnets 6. The winding of the synchronous generator is placed on the teeth of the stator 5, which consists of 3 phase windings: 1, 2, 3. Each phase winding is made in the form of a rigid bus with a large section, so the entire winding is located on three tiers height of teeth 5 of the stator Ii. Each phase is one continuous conductor, made in the form of a meander, which goes around the teeth of the stator 5. The arrangement of the entire winding in three tiers makes it possible to exclude the crossing of the windings in the frontal parts, outside the teeth 5 of the stator I, which occurs in ordinary windings. This makes it possible to wind the generator of increased power in the form of tires with a large section, which is necessary for the flow of large currents. Yoke 4 stator

It is a set of sheets of electrotechnical steel of a certain configuration in the form of teeth 5 and grooves between them. The rotor II of the electric generator is a steel yoke 7 made of electrical steel. On this yoke 7 permanent magnets 6 of different polarity are rigidly fixed.

The electric generator works as follows.

When the rotor I of the generator rotates, the magnetic flux created by the permanent magnets 6 crosses the winding of the stator I. At the same time, an electromotive force (EMF) is induced in the phase windings 1, 2, Z, under the influence of which a current will flow in the winding when the load is connected.

In a three-phase winding, the phase a is shifted due to the phase shift (meanders) along the angle of the circle by 120 electrical degrees. An additional advantage of the winding in the form of a meander is that it has lower ohmic losses due to the lower resistance of the winding, since in such a winding there is no frontal part in comparison with traditional windings, in which the phase winding is a connection of separate sections, each of which consists of turns covering the entire tooth along its perimeter. In a winding in the form of a meander, the tooth from one end is not covered by the winding, therefore the resistance of the winding is less, since the flux coupling of the winding and the active length of the conductors of the phase windings is preserved.

Claims (1)

USEFUL MODEL FORMULA The three-phase winding of a synchronous electric generator for high-power wind turbines is the phase windings made of large-section busbars, which are located in three tiers, and are placed in the grooves of the stator, which is characterized by the fact that each phase winding is one continuous conductor, made in the form of a meander that goes around the stator teeth. N V U i i i sisniv i sni ich sovi k B cha y le o esh yah Tom m - k- scha sia i m KO be Y y g Ya ya V Ya -h ; U o She o I I still Sy N x s y zh : chi v she sh y v ya sh ko z ke ve yz h "ak That still and still po cha as Still I o eh i: y zh ? b u y- St: skh be Ya shchi z i U Yi she in ; Sho » k chnu Kk Her ve b Sn ee sk i cha M It's her ! they baked a child, h o treiy shk 4 vro ykoyen za ovisoiskku - M: sov, . . i EI tov r Mo EI y B as szhya sn i zam i skzhzhikiy o - 1 Ii i YAN na VYM NINI Koha s pyv NNYA ee SCHI IN NY M tya - i S - s i r, tor y Uk y to y y x yah eat y - m I I her Y Kay Ka Z I and them oh I I eat I : and These b 7 Fig. 1 a. Fig. 2