SU85600A1 - Single phase asynchronous motor - Google Patents

Description

The subject of the invention is a single-phase asynchronous motor with a starting winding shifted by 90 ° relative to the working one.

Known engines of this kind have a complex starting system due to the need to turn on phase shifters (capacitance, inductance and active resistances).

In the proposed engine, the starting scheme has been simplified by making the starting winding unbalanced, i.e. with different numbers of sections in the coils of different pairs of poles. The resulting magnetic asymmetry ensures the occurrence of an initial torque.

FIG. 1 shows the electrical circuit diagram of the proposed engine; in fig. 2 is an example of a circuit made of its stator windings for a four-pole maschina.

The motor has two windings: a working winding /, designed for continuous operation, and a starting winding 2, calculated only for the start-up period. The shutdown of the last at the end of the start is carried out automatically by a centrifugal or thermal relay 3.

The working / and starting 2 windings and, laid in the internal cavity of the stator, are shifted in space one relative to the other at an angle of 90 ° and connected to the network in parallel.

The starting winding is made asymmetrical, i.e. with an unequal number of sections in different coils, thus achieving magnetic asymmetry and the occurrence of starting torque.

In this example, the start winding 2 is laid asymmetrically in the stator grooves: one roll has four sections, the next roll connected to it successively has sections, then again there is a roll with four sections; and for the neysshore with a brush of sections.

The number of turns in the sections of both the working winding / and the starting winding 2 are equal to each other. Thus, the number of turns of the starting winding will be less by the number of turns that fall into two sections.

In those grooves where it is necessary to lay the section as doi () s-1 ;; 1: operating winding, and working, the number of turns of the working winding state ;; is 5/3 normal, and the rest / s is reordered to the extreme Ho.-io ; einic lase where there is no winding.

This measure provides an improvement in its use.

The engine operates as follows.

When the motor is turned on, the current flowing through the coils of the working and starting windings creates an asymmetrical magnetic flux in the stator, which interacts with the resultant current and creates a starting moment. The magnitude of the starting moment of the noriotational asymmetry of the resultant flow, i.e., the magnitude of the equalizing current.

Subject invention

Single-phase asychrony motor with starting winding shifted by 90 ° relative to the working one, excluding HI and and with that. that, in order to simplify the starting system, the starting winding is not asymmetrically filled; . i.e. with different numbers of sections in coils of different pairs of poles.

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