RU2242077C1 - Pole-changing winding - Google Patents

Abstract

FIELD: electrical engineering; dual-speed induction motors for driving large fans and the like.

SUBSTANCE: proposed pole-changing winding that ensures pole changing ratio of 2/16 at enlarged slot number of stator slots in motor stator has 48 coil groups with coil numbers in groups alternating in sequence 1, 1, 2, 2, 1, 1, 2, 2 …, two halves in each of three phase windings with differentially connected coil groups in phase winding halves and with cumulatively interconnected halves of phase windings; first half of phase winding includes coil groups numbered 8i - 7, 8i - 4, 8i - 1, 8i + 17, 8i + 20, 8i + 23, 8i + 26; second half of phase winding includes coil groups numbered 8i + 29, 8i + 32, 8i + 45, 8i + 38, 8i + 5, 8i + 8, 8i + 11, 8i + 14; coil leads are taken from starting leads of 8i - 7, 8i + 26; finishing leads of coil groups 8i + 14 are interconnected in neutral point, where i = 1, 2, 3.

EFFECT: enlarged functional capabilities of winding.

1 cl, 2 dwg

Description

The invention relates to electrical engineering and can be used to create multi-speed asynchronous electric motors.

Known pole-switchable winding, consisting of coil groups with a period of alternating numbers of coils in groups 1,1,2,2,1,1,2,2 ... of two halves in each of the three phase windings with the opposite inclusion of coil groups in half phase windings and with the consonant inclusion of half phase windings, while the first half includes coil groups with numbers 8i-7, 8i-4, 8i-1, 8i + 2, the second half includes coil groups with numbers 8i + 5, 8i + 8 , 8i + 11, 8i + 14, the conclusions are taken from the beginnings of 8i-7 and 8i + 2 of the coil groups, the ends of 8i + 14 of the coil groups are combined at the zero point, where i = 1, 2, 3, and the number 36/1, 2, 3 / is subtracted from the number greater than 36.

A disadvantage of the known winding is that it does not allow the switching of poles in relation to 20/16.

The present invention solves the problem of expanding the functionality of the winding with an increased number of grooves on the stator.

The solution to this problem is achieved by the fact that in a pole-switched winding with a period of alternating numbers of coils in groups 1,1,2,2,1,1,2,2 ... of two halves in each of the three phase windings with a counter inclusion of coil groups in half of the phase windings and with the consonant inclusion of the half phase windings, the first half of the phase winding includes coil groups with numbers 8i-7, 8i-4, 8i-1, 8i + 2, 8i + 17, 8i + 20, 8i + 23, 8i +26, the second half includes reel groups with numbers 8i + 29, 8i + 32, 8i + 45, 8i + 38, 8i + 5, 8i + 8, 8i + 11, 8i + 14, the conclusions are taken from the beginnings of 8i-7 , 8i + 26, the ends 8i + 14 of the reel groups are not at the zero point, where i = 1, 2, 3.

Figure 1 shows a diagram of a winding;

Figure 2 is a form of magnetomotive force of the winding.

According to figure 1, the winding consists of coil groups with a period of alternating numbers of coils in groups 1,1,2,2,1,1,2,2,2 ... of two halves in each of the three phase windings with the opposite inclusion of coil groups in half phase windings and with the consonant inclusion of half the phase windings between each other, while the first half of the phase winding includes coil groups with numbers 8i-7, 8i-4, 8i-1, 8i + 2, 8i + 17, 8i + 20, 8i + 23, 8i + 26, the second half of the phase winding includes coil groups with numbers 8i + 29, 8i + 32, 8i + 45, 8i + 38, 8i + 5, 8i + 8, 8i + 11, 8i + 14, the conclusions are drawn from the beginnings of 8i-7, 8i + 26, the ends of 8i + 14 of the coil load pp are combined at the zero point, where i = 1, 2, 3.

For example, the first phase winding (i = 1) includes 1, 4, 7, 10, 25, 28, 31, and 34 coil groups.

According to figure 2, the magnetomotive force of the winding (the sides of the phase A coils are indicated by a square, phase B by a triangle and phase C by a circle) indicates clearly expressed 20 and 16 poles. The winding winding coefficient k _ob16 = 0.933 provides a high degree of utilization of the size of the asynchronous machine with fewer poles.

Sources of information:

1. USSR author's certificate No. 5447922, N 02 K 3/28, 1976

2. USSR author's certificate No. 756547, N 02 K 3/28, 1980

3. USSR author's certificate No. 997191, N 02 K 17 / 14.3 / 28, 1982

Claims (1)

Pole-switching winding with a period of alternating numbers of coils in groups 1,1,2,2,1,1,2,2 ... of two halves in each of the three phase windings with on-off coil groups in the halves of the phase windings and with the consonant inclusion of the halves with each other with the numbers of coil groups in the first half 8i – 7, 8i – 4, 8i – 1, 8i + 2 and with the numbers of coil groups in the second half 8i + 5, 8i + 8, 8i + 11, 8i + 14 s conclusions from the beginnings of 8i – 7 coil groups, with the ends of 8i + 14 coil groups united at the zero point, characterized in that in the first half of the phase winding coil groups with numbers 8i + 17, 8i + 20, 8i + 23, 8i + 26 are included, coil groups with numbers 8i + 29, 8i + 32, 8i + 45, 8i + 38 are included in the second half of the phase winding, conclusions are taken from started 8i + 26 coil groups, where i = 1, 2, 3.

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