DE122795C - POWER COLLECTORS FOR ELECTRICAL MACHINERY - Google Patents

Description

IMPERIAL

PATENT OFFICE.

As is known, the current sensors in electrical machines are used for various organs to be brought into electrical connection with each other or with a conductor.

Usually this is achieved by manipulating a body in this way in relation to others, to oneself holds bodies moving in a certain path and isolated from one another, so that the latter come into contact with the former one after the other and slide over it.

The fixed body, called a brush in electrical machines, is used either as a current collector or as a current supplier and is usually mechanical against the over the sliding parts pressed. The resulting frictional resistance of the brushes is particularly important for small machines.

The main purpose of the present invention is to eliminate this resistance as much as possible, thanks to which the brushes become dispensable. Namely, they become through one under the action of physical forces, such as gravity and centrifugal force, replaces standing bodies, which, like the brushes, delivers the electrical current to the current pickup bars respectively of them decreases.

The subject of the invention is shown in the accompanying drawing, for example, in two different ways Embodiments shown.

Fig. Ι shows schematically a longitudinal section of the armature of a two-pole direct current dynamo machine.

Fig. 2 is a section along the line XX of Fig. 1,

Fig. '3 shows another form of the anchor shown in Fig. 1 and

Fig. 4 is a section along line yy "of the

Fig- 3

As can be seen from these figures, the otherwise common brushes are two out of one A small amount of mercury-formed pantograph replaces those in the pantograph roll freely.

The latter consists of two main parts AB (Fig. 1), with Lau's conductive, non-amalgamating material, e.g. B. iron or steel, and B is made of insulating ground. The part is keyed to the shaft C and conductively connected to it. Part B is ring-shaped; it is screwed onto A so that the two parts together form a round box, the bottom of which is conductive and the wall of which is non-conductive. Around B metal parts D are attached, which pass through the wall B of the sleeve and are flush with the inside of the sleeve. In Fig. 1 these parts D are shown as screws which are screwed radially into B; these replace the otherwise usual current pick-up bars and are connected to the armature windings E like these.

In the can AB there is a drop of mercury G, which, under the influence of gravity, always occupies the lowest position in the cavity of the can. The size of this drop of mercury is calculated in such a way that it can produce an electrical circuit at least between two consecutive screws D. . · ... ..

The shape of the cavity of the current sensor intended to receive the mercury drop is conical in such a way that the conductive part A of the socket forms the base of the conical cavity and the mercury drop is constantly in conductive connection with A.

The mode of operation of the current sensor is as follows: the current goes through the shaft C, which it receives in some suitable way, e.g. B. is fed by a spring m pressed against the end of the shaft or by a disk n which is immersed in a container filled with mercury. From the shaft C the current passes to the conductive part A of the current sensor, and from here through the intermediary of the mercury drop G, as the current sensor circulates, one after the other through the screws D and the various armature coils to the one on the opposite end of the two insulated from one another Part of the CC existing armature shaft has a stuck current sensor, in which the current is drawn off by a drop of mercury in the same way and passed on to the return line by means of the shaft.

When the current sensor rotates, it rolls Drops of mercury around itself; thus it does not generate any significant frictional resistance and the parts causing the electric circuit suffer no wear, so to speak, two Defects which cannot be avoided when using brushes.

In order to prevent the drop of mercury from falling out during transport, as well as the penetration of dust etc. into the cavity of the current sensor, it can be sealed airtight by a glass pane H or in some other way.

The brushes that are usually used in electrical machines are thus affected by drops of mercury replaced, each of which rolls freely in its associated current sensor.

While mercury is best suited for this purpose, it is not said that it is indispensable; on the contrary, it can be the one causing the electric circuit Partly also from other substances, e.g. B. solid bodies exist without being in the essence of the invention, thereby something is changed.

In FIG. 3, the current sensor of one pole is equipped with webs which are held in the usual way between two insulating rings B by means of the disks AA ' screwed onto the shaft C. The current sensor of the other pole at the opposite end of the shaft C is similar to the former, only the disk A 'has been replaced by a capsule A " , and the connection to the long-distance line is achieved by immersing a conductor L in the mercury drop G.

Claims (1)

Patent claim: A current sensor for electrical purposes whose contact pieces are so concentric the machine axis are arranged so that they form a cavity with a smooth wall, which can serve to accommodate one or more electrical circuit pieces, characterized in that that these Stromschlufsteile are freely rolling bodies, the storage of which is conditioned by gravity, and which at Rotating the commutator under the action of gravity to roll around itself, for Purposes to reduce the frictional resistance to a minimum. For this purpose ι sheet of drawings.