SU34075A1 - Switchgear for collector machines - Google Patents

Description

 Single-phase collector engines, as is well known, have the disadvantage of preventing the implementation of a sufficiently powerful normal-frequency drive with a large starting torque that can be used in the field of, for example, electric traction. This disadvantage is the presence of a transformer electromotive force in the short-circuited winding sections of the windings.

a motor causing currents of considerable power and a seriously deteriorating switching condition. The known methods of compensation for the indicated electromotive forces, in particular, the use of additional poles do not provide a sufficiently rational solution of this problem.

The proposed device aims to create a more perfect compensation of transformer electromotive forces and is a form of the device according to author's certificate No. 29898, and in this case, in a two-collector mask, the brushes of one collector are connected to the brushes of the other through an additional compensation winding. The latter is located on the stator of the machine in such a way as 4tob, the electromotive force induced by it is equal to

(347)

largest and inverse in the direction of the transformer electromotive force of short-circuited sections.

In the attached drawing of FIG. 1 is a schematic of the engine connections of the proposed method; FIG. 2 - location of the compensation winding on the stator.

The winding 7 of the machine core (Fig. 1) is attached to the plates of two collectors 2 so that the beginning of the sections are attached to the plates of one collector and the ends to the plates of the other. Between the working plates of the collector there are idle plates or insulation, which are displaced relative to each other so that the short circuit at the moment of commutation can be made only by means of two brushes 5 applied to different collectors. Winding 4 is turned on in the short-circuited part of the circuit through these brushes (Figs. 1 and 2) located on the machine stator and turned on in such a way that it covers the same magnetic flux. The electromotive force induced in the winding 4 almost completely compensates the transformer electromotive force if the numbers of the short-circuited turns and turns of the compensating winding are equal.

This auxiliary winding may be superimposed on the additional poles of the machine.

The subject matter of the invention.

The form of the device according to the author's certificate No. 29898, characterized in that the brushes 3.3 are connected to each other through additional windings 41 4 located on the stator so that the transformer electromotive force is induced in them, is equal in magnitude and is reverse in the direction of the transformer electromotive force of short-circuited sections.

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