SU1758782A1 - Three-phase one-layer winding - Google Patents

Abstract

Use: two-speed asynchronous motors. The essence of the invention: the winding is made single-layer in 54 slots of the stator, the pole ratio is 16: 4, consists of 24 coil groups, has 9 terminals in the external switching circuit L / DAL. The distribution of coil groups over the phases of the winding is given, 2 Il.

Description

The invention relates to pole-switched windings of electric machines of alternating current and can be used in the electrical industry in the manufacture and installation of the stator windings of two-speed asynchronous motors.

The known three-phase two-layer winding with the numbers of pole pairs 16: 4 contains distributed coil groups connected in each phase for a pole P2 into two parallel branches, the beginnings of which form a phase clamp for pole polarity PI, and from the ends - two terminals for - lucidity P2. The winding consists of multiples of six large and small coil groups formed by concentric coils arranged concentrically along the axes of large groups. In the first phase, the first large and fourth small groups in one branch are connected in series, the first small and fourth large groups in the other branch. Two other phases are made similarly and their group numbers

alternate at intervals of two groups. The winding has the following winding ratios KW16 0.866; Kw4 0.648, Kwcp 0.757, is laborious to manufacture due to the use of raznachegovyh coils and has an overestimated value of the motor magnetizing current at high speed of rotation,

A three-phase pole-switchable one-two-layer winding with a pole ratio of 16: 4 is known, which is made in 54 stator slots with the Y / YYY connection scheme. The winding contains 27 coil groups, the ratio of the relative numbers of turns in the coils is 1.0: 0.5. The magnitude of the winding coefficients: Kwie 0,882; , 722; Kwcp 0.772. The disadvantage of the winding is high labor intensity in manufacturing.

The closest in technical essence to the claimed winding is a single-layer two-speed pole-selectable winding selected as a prototype with a pole ratio of 16: 4,

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made in 54 stator slots with external Y / YYY switching circuit. The winding contains coils unevenly distributed over 24 coil groups with combined ends of the third, sixth and ninth branches. The conclusions are made from the beginnings of the first, fourth, seventh branches, from the pairwise joined beginnings of the second and third branches, the fifth and sixth branches, the eighth and ninth branches, the fourth and fifth branches, the seventh and the eighth branches . Winding ratios of the working harmonics of the winding: KW16 0.82, KW4 0.878, Kwcp 0.849. The relative value of the differential emf is 4.1%.

The lack of a winding is a low value of the winding coefficient on the number of poles 2p 16.

The purpose of the invention is to improve the utilization of the active materials of an asynchronous motor at a lower rotational speed.

The magnitude of the winding coefficients of the proposed winding:, 928; Kw4 0,, 903. The relative value of the differential emf is 4.1%.

A comparative analysis with the prototype shows that the winding on the number of poles 2p16 has a significantly higher winding ratio, which allows to improve the starting characteristics and the use of active materials.

FIG. 1 shows the scheme of the proposed single-layer winding; in fig. 2 is an external switching circuit of a winding with a mapping of D / DLA phases.

Coil groups consisting of two coils are indicated by rectangles. Groups containing one coil are shown in squares. The beginnings of the coil groups are indicated by dots.

Conclusions A1, A2, A3. 81, 82, VZ, Ct, C2, СЗ are taken from the points of connection of the ends and the beginnings of the parts: nine and first, first and second, second and third, third and fourth, fourth and fifth, fifth and sixth, sixth and seventh, seventh and eighth, eighth and ninth respectively.

To create a rotating magnetic field with a number of poles of 2p 16, a three-phase supply voltage is applied to the A1, B1, C1 terminals by closing the contacts of the S1 switch. In this case, the contacts of the switches S2, S3 and S4 are open. To create a rotating magnetic field with the number of poles 2p 4, the contacts of the switch S1 are opened and, after pre-closing the contacts S1 and S4, the three-phase supply voltage is applied to the terminals C1, C2 and Sz by closing the contacts of the switch S2. Thus, the poles are switched according to the L / A YA scheme.

The proposed winding has nine conclusions and can be recommended for use in the electrical industry in the manufacture and installation of asynchronous motor stator windings.

Claims (1)

Three-phase single-layer winding with a pole ratio of 16/4, made in 54 stator slots numbered from 1 to 54, containing coils unevenly distributed across the coil groups, combined into nine parts with nine terminals, contains 54 coil groups with sequence numbers from P to G24, of which three groups are formed by two concentric coils with steps 9 and 11, three groups are formed by a coil with a step at 11, twelve groups are formed by a coil with a step at 10, six groups are formed by a coil with a step at 9, distinguished by the fact that, in order to improve the use of active materials of an induction motor at a lower rotational speed three coil groups with order numbers G8, I6, G24 and the beginnings of external coils in grooves numbered 14, 33, 51, respectively, are formed by two concentric coils, six groups with order numbers G4, G7, P2, G15, G20, G23 and the beginning of the coils in the slots with numbers 9, 14, 27, 32, 45. 50 respectively formed by a coil with a step of 9, twelve groups with sequence numbers P, G2, G5, G6, G9, software, G13, G14, G17, P8, G21, G22 and the beginning of the coils in the slots with numbers 1, 3, 10, 12, 19, 21, 28, 30, 37, 46, 46, 48, respectively formed by a coil with a step of 10, three groups with sequence numbers GZ, G11, And 9 and the beginnings of the coils in the slots with numbers 6, 24, 42, respectively, are formed by a coil with a step of 11, and the first part includes coil groups with sequence numbers G4, G9, G21, the second GB, P8, G23, the third - Г8, П9, in the fourth - ПО, П5, Г22, in fifth c-П1. Г24, in the sixth - П, ПЗ, Г20, in the seventh - ГЗ, И6, in the eighth - Г5, Г12, П7, in the ninth - Г2, Г7, П4, coil groups with serial numbers П, Г2. G5, G6, G9, ON, PZ, G14, G17, G18, G21, G22 are included counter to other coil groups within the parts. ex oo t4- oo in / -  -G 1, f J4n “4 e Jb“ B rfУ-Г Т ч, ll- “Ь -“ Hi - -T.-i tij UJ RjOZJ ffjS / J ill9} J S / J VJ tIJtfJ WN U $ J (Jfj; jWJ L L%