SU78913A1 - High voltage direct current machine - Google Patents

Description

The subject of the invention is a high-voltage DC machine, having a collector with idle blades, lamellae, a double set of brushes and devices for improving the commutation, connected between the brushes and the pole terminals.

The proposed machine differs from the known machines of this type in that two rotating commutator switches with two rows of consecutive brushes are used as the specified devices. By making devices like this, firstly, the amount of current in the switched sections is limited (due to the repeated passage of this current through the contact resistances between the brushes to the lamellae of the switches) and, secondly, the current of this current is repeatedly broken.

The drawing shows (in expanded form) part of the collector and part of one of the switch maschiny.

Collector K is made up of alternating M (copper) and idle I (for example, micanthic) lamellae.

The pole groups of the collector brushes K (only the positive pole is shown in the drawing) are made of dual brushes J and 2, isolated from one another and lying: on adjacent lamellae. The brushes have such a width that they cannot connect adjacent working lamellae.

To each of the electrical poles of the machine are connected a commutator KS of the collector type, made, like the collector K, from alternating workers M and idle And lamellae. The switch has two lines of brushes 3-4 and 5-6. Conductors 7 and 8 brushes / and 2 collectors K are connected respectively by brushes of the switch. Jumper 9, 10 and - //, 12 switch brushes are connected in series and form two parallel branches. The last brushes of the 5th and 6th branches are interconnected electrically and form the pole terminal I of the machine (positive).

The brush attachment structure is an arch-curved frame assembled from round iron with transverse crossbars welded to it for rigidity. The frame is fixed bol4 1

RamiH to the floor of the generator room and reliably insulated from the brush holders and brushes.

The switch of the negative electric pole is similarly performed.

Both switches are mounted on a common shaft adjacent to the collector. This shaft is mounted on its sub-supports and, by means of a coupling, is rigidly connected to the shaft of the direct-current mask from the collector side K for synchronous rotation with the machine core.

The connection of the shafts of the switchboard machine should be made in such a way that the axis of each copper lamella of collector K lies on the same straight line as the axis of copper,. switch sipes K, C.

The switching in the proposed machine is carried out as follows.

The direct current from collector K through two parallel groups of brushes / and 2 through conductors 7 and 5 goes to the first elements of the switch, i.e. brushes 3 and 4.

At the moment under consideration, direct current does not pass through the group of brushes 2 on the collector / C, nor through one of the even groups of brushes 4-6 of the switch, since all of the listed groups of brushes are in contact with micanite lamellae I. The brush is active.

Passing through the first contact resistance (coal-copper) from the brush 3 to the copper lamella, the current passes to the second brush 5 through the second contact resistance / copper-coal). Next, in conductor 9, the current falls on the brush 5 of the second group of brushes, through the lamella - on the brush 3, conductor //, brush 3. the third group, etc., and through the Yu shi, the circuit 5 falls on the pole / 7

When the gathering of odd brushes with .ged. The louvers of the collector K and the switch KS of the current in the switched section, limited in magnitude by a significant amount of carbon-copper contact resistance, will break simultaneously under all brushes (multiple open circuit). Because of this, the switch is an effective tool for combating sparks on the collector.

The field of application of the described switches extends to all DC machines prone to sparking and circular fire, and in particular to machines of high power with high and superhigh voltage.

Subject invention

A high-voltage direct-current machine with a collector having idle lamellas and a double set of contact brushes, and with devices connected between these brushes and the pole terminals of the machine and used to improve switching by limiting the current in the switched short-circuited sections of the core winding, distinguished by that two rotating rotary commutator switches with two rows of consecutive brushes are used as these devices, providing not only a limiting force Switched eye due to multiple sections of its transition through the contact resistance between the brushes and the lamellae in E, but a multiple of this current circuit break. , MN 9 10 U kofi ekmop K: p: c; T {3 | DCH koMrviijmamop KS L: ;; lll l ...