SU858180A1 - Three-phase combined winding - Google Patents

Description

one

The invention relates to electrical engineering, namely to the combined windings of alternating current machines, and can be used in single-machine frequency converters, in the rotor windings of synchronous and acHHXpOHtatx cascade machines and dual-feed machines.

The known three-phase combined winding, which, when connected to a three-phase voltage, creates two rotating magnetic fields with a number of poles of 2p 2 and 2p 4 1.

However, the winding has low winding coefficients (K {j 0,407; K. 0,694).

Known with the same ratio of the numbers of the poles, but with much higher winding factors 2.

The winding is known with the ratio of the numbers of poles 2p: 2p2 4: 14 h.

The disadvantage of these windings is limited scope.

The three-phase combined winding is known with the ratio of the number of pairs of a field with a winding coefficient Pr | P,

owls

Ko1 0.19, Koi 0.69 4j. Tom

Higher winding ratios (KO 0.257 and Kp, 0.793) have a winding with the same ratio of pole numbers, replenished from the same spatially shifted by 2 ft / 3 radians of phase windings, each of which consists of 2p series-connected coil groups, while the coil groups of groins, the number of coils in which is a multiple of three, a third of the coils located in the middle of the coil group, have twice the number of turns, compared with the remaining JS coils.

15

The disadvantage of this winding is the poor use of copper due to low winding factors.

The purpose of the invention is to improve the use of copper.

20

This circuit is achieved by the fact that in the winding with the ratio of the numbers of pairs of poles P / P 5 all coils are made with the same step equal to It radians, half of the coil groups have coils, the other coil groups have Z / f5p coils, Z is the number of slots , different coil groups of each phase are located close to each other and are included. 30 according to.

FIG. 1 shows a winding diagram with 2p. 2, 2р- 10, executed on 30 grooves; in fig. 2 - N.S. The windings for the point in time in FIG. 3 decomposition ns (FIG. 2) for two harmonics) in FIG. 4 - N.S. windings for time point t f-jtr / rad; in fig. 5 - decomposition of n. (Fig.4) two harmonics.

A three-phase winding with the ratio of the number of pairs of poles P2 / P 5 (Fig. 1J consists of the same radial-phase phase windings connected in a star. Each phase winding consists of 2SH sequentially according to the included coil groups. All coils are identical in steps equal to TG rad.

The number of slots in which the proposed winding can be laid is determined by the formula

2 - ZOR AND,

where n is any integer.

Half of the coil groups have Z / - / 5p coils in the group, the other trap groups have 1 / - / СЬ. coils i. one and a half times the greater number of coils, and this number is always a multiple of three, in coil groups with a large number of coils, a third of the coils located inside the group have twice as many turns as compared to the other coils (in Fig. 1 these are coils in grooves 2 -17, 12-27, 22-7),

The different groups of each phase are located close to the 7π distance: // g radians in a 2P pole field.

 Winding ratios of the winding for a 2P pole field. (), 957, for 2P2. pole field (2Pj 10) KQf 1. The magnitude of the 2P pole field created by the winding is five times the amplitude value of the 2P2 pole field. The EMF vectors for all three phases from both the 2P pole field and the 2P2 pole field are the same and symmetrically located.

FIG. 2 shows n. coil SFig, 1) for the point in time when the current in phase A is maximum positive, i.e. It flows from the beginning of the phase to the end, and the currents in phases B and C are half amplitude negative. The ordinates of the curve ns proportional to the number of turns of the coils and the magnitudes of the currents. The resultant decomposition of the resulting n. (Fig.2 on two harmonics: the first and the fifth. Fig. 4 shows the NS of the winding for the time radians when the current in phase B is maximum negative, and the currents in phases A and C are half amplitude positive. In FIG .5 shown

decomposition of the resulting ns (Fig. 4 / for two harmonics: the first and the fifth. From a comparison of Fig. 4 and 2, it can be seen that during t K: / 3, the first and fifth harmonic NSs shifted to opposite sides relative to the first (| - initial Positions at distances equal to /% radians.

Consequently, when three-phase voltage is connected to terminals A, B and C, the winding creates magnetic waves with the numbers of poles 2P and 2Pg rotating in opposite directions.

Winding can be applied as a quality.

f ve stator winding of an asynchronous frequency converter at 300 Hz, as well as short circuit of terminals A, B and C, as a rotor winding of synchronous and asynchronous cascade machines and double machines

 nutrition When creating such machines with the help of a stator winding of a 2-pole FIELD in the rotor winding under consideration, an electromotive force (EMF) is induced under the influence of which a current flows through the winding, which creates rotating in opposite directions 2P.t and 2Pa pole floors.

The combined winding replaces 0 two three-phase windings with 2Pu and 2P numbers POS. / - where the ratio of the numbers of pairs of poles Рц / Р 5. At the same time, the consumption of copper wire is reduced by one third, the manufacture is simplified and the reliability of the machine increases.

Claims (1)

Invention Formula Three Phase Combined Winding 0 electric machines of alternating current with the ratio of the numbers of pairs of poles Рр / В 5, made of the same spatially shifted by FH / S for phase windings, kg kg of which consists of 2P series-connected coil groups, with this in coil groups, the number of coils is multiple three, one third coils located in the middle 0 coil groups, have twice the number of turns, as compared with the rest, coils, characterized in that, in order to improve the use of copper, all coils are performed with the same pitch, equal VT radians, half of the coil groups have coils, the other coils groups have by / Sp. coils (z-number of grooves, different-coil groups of each phase are located close to mfis radians, and corjjacHO are included. Sources of information taken into account in the examination 1. The author & testimony of the USSR 5 532153, CL H 02 K 3/28, 15.10 76J