SU1721731A1 - Three-phase polarity switching winding for motor with rotational speed ratio of 4:1 - Google Patents

Abstract

The invention relates to electrical engineering and can be used to create single-speed and multi-speed asynchronous motors with a 24: 6 pole ratio. The purpose of the invention is to reduce the consumption of electrical materials by improving the harmonic composition of the magnetomotive force of the winding. The three-phase pole-switching winding consists of 36 coil groups with numbers from 1K to ZBK. The first half-phase of the first phase includes coil groups with numbers 1 K. - 8К, 13К, - 20К, 25К, - 32К. in the second half-phase of the first phase are included the coil groups with numbers 31 K, -26K, 19K. -14K. 7K, -2K, in the first half-phase of the second / 7 / G YAK 21I 2JK 25K Sh 23K 31K

Description

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

The two-speed three-phase winding is known with a pole ratio of 1: 4, in which half of the coils are made in steps of Y 9 and half in steps of Y 3 1.

A disadvantage of the known winding is the increased consumption of active materials due to its large frontal parts.

Closest to the proposed one, there is a three-phase pole-switching winding with a ratio of pole pair numbers P1: P2 4: 1, containing in each phase 2Pa pairs of concentrically dispersed spacing coil groups with opposite connection of differently sped groups of adjacent phase 2 pairs.

A disadvantage of the known winding is the high consumption of electrical materials due to the large winding pitch.

The purpose of the invention is to reduce the consumption of electrical materials by improving the harmonic composition of the magnetomotive force of the winding and reducing the pitch of the coils.

This goal is achieved by that a three-phase pole-switching winding for electric motors with a 4: 1 rotation frequency ratio consists of 36 coil groups numbered from 1K to 36K, and each phase winding is divided into two half-phases with leads from the beginning, ends and points of the half-phase connecting, while the first half-phase of the first phase contains coil groups with numbers 1K. -8K. 13K, -20K, 25K. -32K; the second semi-phase of the first phase contains coil groups with numbers 31 K, -26K, 19K, -14K, 7K, -2K; in the first half-phase of the second phase are included the coil groups with numbers 5К, -12К, 17К. -24К.29К, -36К; in the second half-phase of the second phase enter the coil groups with the numbers 35K, -KOC, 23K, -18K, 11 K, -6K; the first semi-phase of the third phase contains coil groups with the numbers 9K, -16. K, 21K, -28K, ЗЗК, -4К; coil groups are included in the second half-phase of the third phase

with numbers KK, -34K, 27K. -22K: 15K, -10K, where the sign - means the counter inclusion of the coil group.

When the number of slots on the stator Z-36 phase

windings contain concentrically located raznoglakovye single-coil groups. When the number of slots on the stator Z 72 phase windings contain concentrically located raznoshagovye two-core groups.

FIG. 1 shows the unfolded winding scheme; in fig. 2-5 - curves of magnetomotive forces.

According figs, 1 winding contains 36

single-coil groups with numbers from 1K to 36K with the number of grooves on the stator Z 36, and with the number of grooves on the stator Z 72, the coil groups are made of two coils, and the first half-phase of the first phase includes

coil groups with numbers 1 K, -8K, 13K. -20K, 25K, -32K; the second semi-phase of the first phase consists of coils with numbers 31 K, -26K, 19K, -14K, 7K, -2K; in the first half-phase of the second phase included the coil groups with numbers 5K, -12K. 17K, -24K, 29K, -36K; the second semi-phase of the second phase contains the coil groups with the numbers ZBK, -ZOK, 23K. -18K. 11 К, -6К; in the first phase of the third phase included coil groups with numbers

9K, -16K. 21 K, -28K. ЗЗК, -4К; the second subphase of the third phase consists of coil groups with numbers ЗК, -34К, 27К, -22К. 15K, -10.K, where it means the counter inclusion of the coil group.

When connected to a three-phase network 24G1 pins. 24C2, 24C3 receive 2P 24 (Fig. 2 and 3). The phase connection circuit is a star, if the three-phase voltage is applied to the 6C1, 6C2, 6S3 terminals. combine pins 24С1. 24C2. 24СЗ to zero point |. 2P 6 is obtained (Figs. 4 and 5), the phase connection scheme is two stars.

Claims (1)

The invention is a three-phase pole-switching winding for an electric motor with a ratio of 4: 1 rotational frequencies, each phase of which is divided into two half-phases with leads from the beginnings, ends and points of connection semi-phases, consists of 36 coil groups with numbers from 1K to 36K, characterized in that, in order to reduce the consumption of electrical materials by improving the harmonic composition of the magnetomotive winding, the first half-phase of the first phase includes coil groups with numbers 1K, -8K 13K. -20K 25K. -32K; the second half-phase of the first phase includes coil groups with numbers 13К, -26К, 19К, -14Х, 7К, -2К; in the first half-phase of the second phase 5K reel groups are included. -12K, 17K, -24K. 29K, -36K; in the second phase of the second phase - coil groups with numbers 35K, -20K, 23K ..- 18K. 11 K. -6K: in the first half-phase of the third phase - coil groups with numbers 9K, -16K. 21 К, -28К, ЗЗК, -4К; in the second half-phase of the third phase - coil groups with numbers ЗК, -34К, 27К, -22К. 15K, -10K, where the sign - means the counter inclusion of the coil groups. FIG. 2 FIG. 3 FIG. four