RU2285994C1 - Three-phase pole-change winding - Google Patents

Abstract

FIELD: electrical engineering; three-phase multispeed motors.

SUBSTANCE: proposed pole-change three-phase winding where coil number alternation in groups is 1, 1, 4, 1, 1, 4 ... has its phase winding connected to coil groups numbered 6i - 5, 6i 3, 6i - 1, 6i + 4, 6i - 6, 6i = 8; finishing lead of group 6i - 5 is connected to starting lead of group 6i - 1; finishing lead of 6i - 1, to finishing lead of 6i + 4; staring lead of 6i + 4, to finishing lead of 6i + 8; starting lead of 6i + 8, to finishing lead of 5i - 3; phase leads are brought out from starting leads of 6i - 5, 6i - 3, 6i + 3, 6i + 6; finishing leads of coil groups 6i + 6 are interconnected in neutral point; novelty is that starting lead of coil group 6i + 6 is not connected to starting lead of group 6i + 8 and to finishing lead of 6i - 3 and that phase leads are brought out from starting leads of group 6i + 8, where i = 1, 2, 3.

EFFECT: enhanced use factor of induction motor size at minimal pole number.

1 cl, 5 dwg

Description

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

A three-phase pole switchable winding is known, consisting of coil groups with a period of alternating numbers of coils in groups 2, 2, 1, 1, 2, 2, 1, 1 ... counterclockwise included in the phase.

The disadvantage of this winding is the presence of eight coil groups in phase, which increases the manufacturing time of the electric motor / 1, 2, 3 /.

Closest to the proposed winding is a three-phase pole-switched winding with a period of alternating numbers of coils in groups 1,1,4,1,1,4 ..., the phase winding includes coil groups with numbers 6i-5, 6i-3, 6i-1 , 6i + 4, 6i + 6, 6i + 8, the end 6i-5 of the coil group is connected to the beginning of 6i-1, the end of 6i-1 is connected to the end of 6i + 4, the beginning of 6i + 4 is connected to the end of 6i + 8, the beginning of 6i +8 is connected to the beginning of 6i + 6 and the end of 6i-3, the conclusions are taken from the beginning of 6i-5, 6i-3, 6i + 6 of the coil groups, the ends of 6i + 6 of the coil groups are combined to the zero point, where i = 1, 2, 3/4 /.

The disadvantage of this winding is the low degree of use of the size of the asynchronous machine with the least number of poles.

The present invention solves the problem of increasing the degree of use of the size of the asynchronous machine with the least number of poles.

The solution to this problem is achieved by the fact that in a three-phase pole-switched winding with a period of alternating numbers of coils in groups 1,1,4,1,1,4 ... the phase groups are included in the phase winding with numbers 6i-5, 6i-3, 6i- 1, 6i + 4, 6i + 6, 6i + 8, the end of the 6i-5 coil group is connected to the beginning of 6i-1, the end of 6i-1 is connected to the end of 6i + 4, the beginning of 6i + 4 is connected to the end of 6i + 8, the beginning 6i + 8 is connected to the end of 6i-3, the conclusions are taken from the beginnings of 6i-5, 6i-3, 6i + 6, 6i + 8, the ends of 6i + 6 of the coil groups are combined to the zero point, where i = 1, 2, 3.

Figure 1 shows a detailed diagram of a three-phase pole-switchable winding;

figure 2 shows a diagram of the in-phase connections of the coil groups;

figure 3 shows the form of the magnetomotive force of the winding when turned on at 10 poles;

figure 4 shows the form of the magnetomotive force of the winding when turned on at 4 poles;

figure 5 shows the form of the magnetomotive force of the winding when turned on 2 poles.

The three-phase pole-switched winding (Fig. 1) consists of eighteen coil groups with a period of alternating numbers of coils in groups 1,1,4,1,1,4 ..., the phase windings include coil groups with numbers 6i-5, 6i-3 , 6i-1, 6i + 4, 6i + 6, 6i + 8, the end 6i-5 of the coil group is connected to the beginning of 6i-1, the end of 6i-1 is connected to the end of 6i + 4, the beginning of 6i + 4 is connected to the end of 6i + 8, the beginning of 6i + 8 is connected to the end of 6i-3, the conclusions are taken from the beginning of 6i-5, 6i-3, 6i + 6, 6i + 8, the ends of 6i + 6 of the coil groups are combined at the zero point, where i = 1, 2 , 3.

The phase winding (figure 2) includes coil groups with numbers 6i-5, 6i-3, 6i-1, 6i + 4, 6i + 6, 6i + 8, the end 6i-5 of the coil group is connected to the beginning of 6i-1, the end 6i-1 is connected to the end 6i + 4, the beginning 6i + 4 is connected to the end 6i + 8, the beginning 6i + 8 is connected to the end 6i-3, the conclusions are taken from the beginnings 6i-5, 6i-3, 6i + 6, 6i +8, the ends 6i + 6 of the coil groups are combined at the zero point.

When connecting the voltage to the terminals 20, 24, 28 and connecting the terminals, respectively, 22 and 27, 26 and 19, 30 and 23, a ten-pole magnetic field is created (Fig. 3).

When the voltage is connected to the terminals 22, 26, 30 and the connection of the terminals 29 and 27, 21 and 19, 25 and 23, respectively, a four-pole magnetic field is created (Fig. 4).

When the voltage is connected to the connected terminals, respectively 29 and 27, 21 and 19, 25 and 23 and the connection of the terminals 20, 24, 28, 22, 26, 30 creates a bipolar magnetic field (figure 5).

Graphs of magnetomotive forces (Figs. 3, 4 and 5) (the sides of the coils of phase A are indicated by a square, phases B by a triangle and phases C by a circle) are plotted for the point in time when the current in phase A has the greatest positive value. The number of turns in the coils of single-coil groups is 1, 2 times higher than in the coils of four-coil groups. This achieves the balancing of electromotive forces of parallel branches when turned on at two poles. The winding coefficient K _ob2 = 0.75 provides a high degree of utilization of the size of the induction motor with the smallest number of poles.

Information sources

1. USSR copyright certificate No. 515210, N 02 K 3/28, 1973

2. USSR author's certificate No. 714578, N 02 K 3/28, 1978

3. USSR author's certificate No. 884039, N 02 K 3/28, 1982

4. Copyright certificate of the USSR No. 1001339, N 02 K 17/14, 1983 - prototype.

Claims (1)

Three-phase pole-switched winding with a period of alternating numbers of coils in groups 1, 1, 4, 1, 1, 4 ..., in the phase winding are included coil groups with numbers 6i-5, 6i-3, 6i-1, 6i + 4, 6i +6, 6i + 8, the end 6i-5 of the coil group is connected to the beginning of 6i-1, the end of 6i-1 is connected to the end of 6i + 4, the beginning of 6i + 4 is connected to the end of 6i + 8, the beginning of 6i + 8 is connected to the end of 6i -3, the conclusions are taken from the beginnings of 6i-5, 6i-3, 6i + 6, the ends 6i + 6 of the coil groups are combined to a zero point, characterized in that the beginning of 6i + 6 is not connected to the beginning of 6i + 8 and the end of 6i-3 , the conclusions are taken from the beginnings of 6i + 8 coil groups, where i = 1, 2, 3.

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