DE707822C - Rotary transformer - Google Patents

Description

Rotary transformer The invention relates to a rotary transformer, its laminated core parts in the form of equiaxed, mutually rotatable Discs or ring discs with flat abutment surfaces placed directly on top of one another and have windings embedded in grooves. The winding levels of the windings lie parallel to the abutment surfaces.

In the case of the known transformers of this type, after rotation the disks and the windings against each other in the position where the regulated Voltage is a minimum, i.e. the windings are not linked to one another, a large leakage flux and thus an undesirably large load-dependent voltage drop develop.

According to the invention, this load-dependent voltage drop becomes substantially reduced by the fact that the lamination of the two core parts of the transformer is chosen so different from each other that the in the zero position of the transformer developing leakage flux when flowing through the core part carrying the primary winding is prevented.

For a more detailed explanation of the invention, please refer to the drawings.

Figs. I and 2 show a known single-phase rotary transformer in side view. i and 2 are the circular core parts that can be rotated relative to one another. The core i assumed here to be movable carries, for example, the primary winding, while the secondary winding is applied to the stationary core 2. The cores can be designed in a known manner .als rings in which grooves 3 and q. are milled. The sliding surfaces at the gap 7 are ground smooth so that the two Core parts can be pressed together completely tightly.

Every second pole 8 of the core i is from an excitation winding 5 and every second pole g of the none 2 is surrounded by a secondary winding 6. The secondary coils are preferably connected in series, while for the excitation coils in many In some cases, a parallel connection is advantageous.

In certain cases it may be necessary to divide all poles of the nucleus i and to surround all poles of the core 2 with windings that alternate against each other. or are connected in parallel in opposite directions.

To regulate the voltage, the annular disk i is rotated in a known manner about a common axis with respect to the annular disk 2. The voltage is at a maximum when the windings of the washer i oppose those of the washer 2 (Dep. I). The voltage is zero when the Pole S of one core i, as shown in Fig. 2 posed, the. Winding grooves of the other Facing core 2. With further rotation of the washer i increases now again with the opposite sign 5 b In the zero position ( Fig. 2) the sparkling wine Outer winding 6 is not linked to the err, egerwi.cklung 5. If a load current occurs in the secondary winding, a disturbing leakage flux can develop as a result. To avoid the magnetic resistance of the iron cores i and 2 for the exciter raft being increased, for example, the structure of the cores shown in Figs. 3, 3a, 3b can be used . Fig. 3 shows the side view of a rotary transformer without windings, while Fig. 3a shows the structure of the core part i carrying the primary winding. The primary core consists of individual partial cores ii, which are composed of U-shaped bent sheets. The poles of these sheet metal cores grind on the surface of the core 2. The aforementioned formation of the core i ensures that the flow of excitation in the primary winding in the Netten 3 intei-gei) raclite primary winding is not hindered one of the sheet metal cores it wants to pass over to the other, Franz is erlieblieh weakened. The core 2 for the Sekitiidän @ -iclclu: i; is designed in such a way that it slows down the exciter raft as slowly as possible even in the zero positions of the transformer. In order to achieve this, the core 2, as shown in Fig. 3b, is atis helically wound sheet iron strips. Just like the core i, this iron core is held together by an annular, strong yoke i (Fig.;). Each The inner body r of the cores i and 2 can consist of a poorly magnetic material, e.g. cast iron.

To increase the strength of the core i, it can be advantageous to the z @ t-like sheet metal cores i t existing air gaps 12 finite arbitrary #: em fill in non-diagnostic material.

Another embodiment of the invention is shown in Figs. 1a and 1b. Here the two Rin cores consist of partial cores ii and i i ', which have U-shaped cut sheets. The @@ 'ickltui @@ en are woven in a meandering ribbon shape through the cores. The sheets are layered in such a way that the individual layers follow one another in the direction of the radius. In the case of the toroidal core for secondary use, the sector-shaped air gap 12 'existing between the partial cores ii' is expediently reduced by the width of the U-shaped sheets increases outward. So far then still There are air gaps, these are partly made of magnetic material 'llt, in order to avoid the pathogen raft, which is in the zero , llung from one leg of a Tell- res ii 'after the adjacent leg @ 't ines other partial core ii' must pass over, to offer the lowest possible resistance. In the case of the toroidal core for the primary winding, on the other hand, the air gaps i 2 present between the partial cores ii remain unfilled, since they are intended to form a high resistance for the stray raft.

Shall the previously described rotary transformers according to the invention are used for polyphase power, so will both the primary winding and the secondary winding is divided into winding groups and each phase a winding group assigned. It can be advantageous to use the winding groups of the primary winding and switch the secondary winding so that they reverse one after the other Own winding sense.

Figure 5 shows a known single-phase rotary transformer with cores designed in the shape of circular disks. each of the two circular disks is provided with at least one groove to accommodate the winding. The smoothly ground pile surfaces are expediently placed horizontally on top of one another. 13 and i @ are the winding slots; s is a spindle for twisting the core parts. against each other about the axis z.

The Fig.6a to 6c represent the structure of the cores according to the invention such. Transformer represents. The lamination of the cores is chosen here so that the excitation raft generated by the primary winding is as little obstructed as possible Load current generated leakage flux, however, is hindered as much as possible. In Fig.6a to 6c is both the primary winding 5 on the core i and in a known manner the secondary winding 6 on the core 2 is divided into two coils, each of which only includes one half of the circular disk. The individual coils are connected so that the The direction of current of both coils in the slots is the same.

The Fig.6a and 6b show the relative position of the primary core i to the Secondary core 2 at zero sectional voltage. For setting the maximum secondary voltage the core i must be twisted by 9o '. The layering of the notch i is chosen so that the layers follow one another in the direction of the groove 13, i.e. H. the levels of Sheets are perpendicular to the groove. In this way, the symbol (D (D indicated pathogen flow in the core i is not opposed to an obstacle. Of the Core z =, as can be seen in particular from Fig. 6c, is composed of parts. In the upper part containing the groove 14, the sheets run parallel to the groove: while the iron package located under the groove 14 and serving as a yoke is perpendicular to it having running stratification. Thereby there is a flow of excitation, which is in the zero position must close around the groove 13, despite the perpendicular to the groove 14 Sheet metal layering of the lower core part of a a practically resistance-free power flow path given. For the leakage flux generated by the winding 6, however, that shown in FIG Position of the nuclei i and a is: the passage through the nucleus i is hindered by that it must run perpendicular to the metal sheets.

In some cases it can be advantageous to laminate the two Parts of the core 2 are not perpendicular to one another. l, ate, but under a certain angle. In order to keep the losses as low as possible, the Always choose the angle so that the flow of excitation is in the most common Control position is hindered as little as possible.

To reduce the leakage flux, an appropriate Layering of the core i in this also a perpendicular to the groove 13 extending Air gap or a blocking winding are provided. The blocking winding consists of the illustrated embodiment (Fig.6a), from a Kurzschlrz6ring g. There the winding plane of this short-circuit ring perpendicular to the winding plane of the primary winding and is parallel to the excitation flow, the primary voltage in the short-circuit ring Not to induce a tension. Such blocking windings can also-with the rest Advantageously, can also be used in the previously described exemplary embodiments.

@Es, the blocking winding on the primary core, is particularly advantageous i in the same plane as the primary winding, but rotated by go ° with respect to this to raise. Fig. 7 shows the core with such a winding arrangement. the Blocking winding is here, like the primary winding, in two coils g 'and g " divided up. The one which is necessary for the blocking winding and which runs perpendicular to the groove 13 The slot can be small, since there may only be one for each winding g 'or 9 " Rod is required. This arrangement has the advantage that the secondary winding 6 completely covers with the blocking winding in its zero position (see Fig. 6b) and as a result, is so closely coupled with this that the leakage flux is largely destroyed will. The structure of the core carrying the secondary winding is otherwise the same, as shown in Figs. 6 b and 6 c.

. The windings g 'and g "can be arranged on the: Pillar core also in the form of an 8 on each half of the core. Fig. 8 shows such a compensating winding Excitation flux generated in the blocking winding parts cancel each other out. Furthermore, it is possible in this way to largely equalize the flow in two quadrants of the core. the groove 15 can be made narrow.

Fig.9 shows a particularly advantageous arrangement in which no special: blocking windings are necessary to hinder the leakage flow. Even here is the stratification of the core i and that of the core, not shown, for the same as explained with reference to Figures 6a to 6c. The primary winding is in four Split coils, and these are connected in parallel. Limiting the leakage flux takes place in this arrangement in a manner similar to that shown in Fig. 8 Arrangement. Here, too, the secondary winding is in the zero position with the primary winding concatenated so that the leakage flux is compensated.

The rotary transformer according to Figures 6 to 9 can only be used as a single-phase regulator to serve. Several units must be combined to control several phases. Appropriate In this case, it may be necessary to arrange the individual rotary transformers one above the other.

Claims (1)

HATENT CLAIMS: "i. Rotary transformer, its laminated core parts in the form of equiaxed, mutually rotatable disks bz «-. Washers are laid directly on top of one another with flat abutting surfaces and are embedded in grooves Have windings whose winding planes are parallel to the butt surfaces, thereby characterized in that the lamination of the two core parts is so different from one another it is selected that the stray flux that forms in the zero position of the transformer is hindered when flowing through the core part carrying the primary winding. z. Rotary transformer according to claim i, characterized in that the annular core part for the primary winding from a number of adjacent ones with mutual spacing There are individual cores in a U-shape, the poles of which form the abutting surface of the core part, and. that the Core part for the secondary winding made of spirally wound Sheet iron band (Fig.3). 3. Rotary transformer according to claim i, characterized in that that the annular core parts for the primary winding and the secondary winding There are individual cores whose U-shaped cut flat sheets are layered in such a way that that the layers follow one another in the direction of the radii of the toroidal cores (Fig.4). 4. Rotary transformer according to claim 3, characterized in that the legs of the ring-shaped individual cores of the secondary core according to the circumference of this core widen towards (Fig.4b). 5. Rotary transformer according to claim 4, characterized in that that the gaps (12 ') occurring between the individual cores with magnetic material are filled in (Fig.4b). 6. Rotary transformer according to claim i with circular disk-shaped Core parts, which are provided with a groove in the middle to accommodate the winding, characterized in that the core part carrying the primary winding consists of a laminated core consists, whose sheet metal planes are perpendicular to the groove (13), and that the secondary winding load-bearing core part is composed of two laminated cores, the sheet metal planes of which are perpendicular run towards each other and one of which has the groove (i 4) (Fig.6). 7th Rotary transformer according to Claim 6, characterized in that the primary winding load-bearing core part is divided into four quadrants by two grooves, one of which two of the same polarity are surrounded by a primary winding part, and that each two quadrants of different polarity of a blocking winding (9 'or 9 ") are (Fig.7). B. rotary transformer according to claim 6, characterized in that the core part carrying the primary winding is divided into four quadrants by two slots each of which is surrounded by a primary winding part (Fig.9). 9. Rotary transformer according to claim 8, characterized in that the primary winding parts are connected in parallel are.