SU76597A1 - Method of asymmetrical activation of two-winding three-phase asynchronous motor windings - Google Patents

Description

The subject matter of the invention relates to methods for asymmetrically turning on the windings of a two-winding three-phase asynchronous engine: Klimatel (Kli windings of two single-winding motors operating on a common shaft) for obtaining a low idle speed with a reduced current.

FIG. 1, 2 and 3 various variants of electric circuits for switching windings according to the proposed method are shown.

In the first variant (Fng. 1), the phases / windings A and B, connected by a star, are connected to the phase / supply line. Phase 2 of winding B is connected to the phase // line, and phase 3 of winding A is connected to the phase of the /// line. Phase 3 of winding B is electrically connected to phase 2 of winding A.

In the second variant (Fig. 2), phases 2 and 3 of each winding are electrically short-circuited; their common points include: windings B in the phase // lines, and windings L in the phase /// lines.

In the third variant (Fig. 3) of phase 2 and 3, windings B are electrically connected and included in the phase // line. Phase 2 windings A are connected to the zero point of winding B, and phase 3 is connected to the phase of the /// line.

The diagrams of FIG. I and 3 create asymmetrical three-phase power and produce rotating elliptical fields whose amplitudes are shifted relative to each other.

In the circuit of FIG. 2, the known single-phase connection is used with the difference that the terminals of both windings are three-phase. In this case, two pulsating fields are applied, with a constant shift between the amplitudes.

Subject invention

Claims (3)

1. An asymmetric method of turning on the windings of a two-winding three-phase asynchronous motor (or windings of two single-winding motors operating on a common shaft) to obtain a low idle speed when current decreases. wherein in both star windings, the first phase is connected to the phase / supply line, the second phase of one winding is to the phase // line, the third phase of the other winding is to the phase /// line, and the remaining phases of both windings electrically connected to each other. 2. A variation of the method according to claim 1, characterized in that each of the windings has a second and third 4-; i the phases are electrically shorted and the common point of one winding is connected to the phase // line, and the common point of the other is connected to the phase I /. line. 3. Modification of the method according to claim 1, characterized in that in one winding the second and third phases are electrically short-circuited and the common point is connected to the phase // line, and in the other winding the second phase is connected to the zero point of the first winding, and third phase - to phase /// line.