SU1095314A1 - Three-phase combined winding - Google Patents

Abstract

THREE-PHASE COMBINED ROUND-. AC AC electric machines with pole pair numbers p and p, where P2 / p, 7/2, for example, for single-machine frequency converters, synchronous and asynchronous cascade machines and dual power machines, are made of identical spatially shifted 4J connected to a star (: ; 4g radian phase windings consisting of series-connected coil groups with the same number of turns in the coils, characterized in that, in order to improve the use of copper by increasing the winding factors, one phase has According to the public, the coil groups 1 and H-24k, consisting of 21 coils, the oppositely connected coils g {) upps 1 + 3k, 1 + 161, consisting of k coils, and the coil group 1 + 331, consisting of 21s coils, This group lf-16k has a groove step, group 1 - “- 31 has a groove step, the remaining coil groups of this phase have 8k groove divisions (L coil groups of the other two phases contain coil groups shifted by and -: - radians respectively) but relative to the coil groups of the first phase, where k, where z is the number of slots. . . saved 00

Description

The invention relates to electrical engineering, in particular to the combined windings of alternating current machines, and can be used in single-machine frequency converters, in the rotor windings of synchronous cascade machines and dual power machines. The three-phase junctional J-pole winding is known, where p, / p 7, is made of star-connected phase windings, which consist of series-connected coil groups C1. A disadvantage of the known device | is a limited scope. A three-phase combined 2p272p-pole winding is known, where р2 / Р-, 7/2 is made of identical spatially shifted by 4l / 3 radians of phase windings connected in a plane consisting of successively connected coil groups with the same number of turns in coils C 2. However, this device is characterized by poor use of copper due to low winding factors. The purpose of the invention is to improve the use of copper by increasing the winding coefficients. The goal is achieved by the fact that in a three-phase combined winding of AC electric machines with the number of pairs of poles p and p, where p / Pi 7/2, for example, for single-machine frequency converters, synchronous and asynchronous cascade machines and dual power machines made of connected into a star of the same spatially shifted 4Jf / 3 radian phase windings consisting of sequentially connected coil groups with the same number of turns in the coils, one phase has coil groups 1 and 1 + 241 connected consisting of 21. a cat ECs, included counter-coil groups 1 + 31 ;, 1 + 161, consisting of 1 coils, and coil group 1 + 331, consisting of 2k coils, while group 1 + 16 has a pitch v 21 groove divisions, group 1 + 31c has a pitch: / “OZ of groove divisions, the remaining coil groups of this phase have w v 8k groove divisions, the coil groups of the two Other phases are connected similarly with C4 – P QJi per and –j– radians, respectively, where 1 ° of grooves In FIG. 1 shows a winding diagram with 2p 4, 2p2 14, made on 2 42 slots; figure 2 - N. with. winding for the time t 0; on fig.Z the same, decomposition n. two harmonics; na fig.4 - ns winding for a point in time in radians; on fig.Z - the same, decomposition n. by-two harmonics. The three-phase winding with the ratio of the numbers of pairs of poles, 7/2 (FIG. 1), is made of star-connected phase windings, each of which consists of successively connected coil groups with the same number of turns in the coils. The number of slots in which the proposed winding can be laid is determined by the formula Z, where 1 is any number. The coil group number is determined by the slot number in which the first active side of the first coil group is located. Phase A contains the coil groups 1, 1 + 24, included according to, and l + 3k, 1 + 161 (, 1 + ЗЗК, included meetings, fno, where l At the same time, the coil groups 1, 1 + 241 "; and 1+ 331 each have 2k coils, the other coil groups of this phase are 1 coils each. The coil group 1 + 161 has a step s 21c of groove divisions, the group 1 + 31 has a pitch: 31 groove divisions, the other coil groups of phase A have a pitch: / 81 grooved divisions: Phases B and C are made in a similar way and are shifted relative to phase A, respectively, NA - to -j- radians in a 2p-pole field, ie, 14) s and 281 groove divisions. With p 2, in addition to the indicated coil groups, p-, i are added to similar coil groups that are similarly connected in the same way, the numbers of which are determined by adding a coil to the number. Node group number is even-numbered even numbers from 2 to p. Winding winding coefficients, l 2p-pole field (2p 4) Kog, 0.97, for 2p-pole field (2p-10) Ko5. , 1. 31 The current in phase A (FIG. 2) is maximum positive, i.e. flows from the beginning of the phase to the end, and the currents in the B and C phases of half amplitude are negative. The ordinates of the curve n, p. proportional to the number of turns of the coils and the magnitudes of the currents. The resulting ns decomposes into two harmonics: the second and seventh (Fig. 3). The current in phase B is maximum negative, and the currents in phases A and C are half-positive amplitudes (Fig. 4. The resultant NS decomposes into two harmonics: the second and seventh (Fig. 5). that during the time of the second and seventh NSs they shifted in opposite directions relative to the initial position by distances equal to W g - radians. When three-phase voltage is connected to terminals A, B and C, the winding creates magnetic fields with numbers of 4 poles 2p-j and 2p2, rotating in opposite directions. The winding can be used as stator winding of 225 Hz asynchronous frequency converter, as well as short circuit of terminals A, B and C, as a rotor winding of synchronous and asynchronous cascade machines of dual power. EMF is induced, under the influence of which a Current flows in the winding, creating a 2 p -polar and 2p rotating in opposite directions, - a pole floor. The combined winding replaces two three-phase windings with 2 p and 2 p pole numbers, / where the ratio of the numbers of pole pairs p-i / P-i 7/2. This reduces the consumption of copper wire by 30.8%, simplifies manufacture and increases machine reliability.

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Claims (1)

THREE-PHASE COMBINED WINDING of electric machines of alternating current with the number of pairs of poles and p ₂ , where P ₂ / p, = 7/2, for example, for single-machine frequency converters, synchronous and asynchronous cascade machines and dual-power machines, made of the same spatially connected shifted 4Ji ₄ on the j-radian of phase windings consisting of series-connected coil groups with the same number of turns in the coils, characterized in that, in order to improve the use of copper by increasing the winding coefficients, one phase has 1 and 1 + 24k connected according to the coil groups, consisting of 2k coils, included 1 + Zk, 1 + 16k counter-coil groups, consisting of k coils, and a 1 + 331 <coil group consisting of 2k coils, while the 1 + 16k group has a pitch of y = 2k groove divisions, the group 1 + 31 <has a step y = 3k. groove divisions, the remaining coil groups of this phase have a pitch of = = 8k groove divisions, coil groups of the other two phases contain coil groups shifted by and radian respectively relative to the coil groups of the first phase, the number of grooves. where where <", SU t, 1095314> 1095314 2