DE1538508C - Star / delta starter for asynchronous three-phase motors - Google Patents

Description

3 4

create plates. On the shift lever 1, the shift rod 15 is also in the position shown in FIG. 2 shown a switching rod 10 is attached, the normally closed contacts position and the normally open contacts 16, 17 and 18 11 and 12, which do not close in the de-excited. Due to the pressure of those unable to return The rest position (FIG. 2) on the fixed contact spring 5 is when the locking plate is withdrawn create and thus twist the star connection 5 head 14 of the shift lever 1, and it will create. the normally closed contacts 11 and 12 to produce the

The shift rod 10 is closed at one of its ends with a star connection.

a locking head 13 in the form of a butt- The terminals U, V and W are in this way

head provided, which is connected to the phases 20, 21 and 22 of the network on a corresponding ver

Locking head 14 connected to a switching rod 15 of an io working contacts 16, 17 and 18, while

first contactor B can be applied. The switching rod 15 rend the terminals Y, Z and X through the idle contact

lies parallel to the shift rod 4 and has three artefacts 11 and 12 being short-circuited,

Beitskontakte 16, 17 and 18 on, which when energized To switch to the delta connection

Contactor rest against fixed contact plates. (Fig. 3) is in addition to the first contactor B

The fixed contact plates are partly energized with 15 the second contactor A. Overcoming the

the three three-phase mains phases 20, 21 and 22, partly the force of the return spring 5, the shift levers 1

with the motor terminals U, V, W, X, Y and Z twisted and thereby initially the normally closed contacts 11

bound. and 12 of the star connection opened and then the

The F i g. 4 to 9 show the structural design of the normally open contacts 6, 7 and 8 of the delta connection of the starter. Accordingly, the shift rod 10 is closed as a cross 20. As a result, clamps Y and Ό are made of insulating material, on which there is a pair of rotary levers 1 with phase 20 of the network, clamps Z and V , the pins of which with phase 21 and clamps X and W with bearing 2 seated on retaining flanges 23, which are connected to one of the phase 22.

Isolation plate 24 are attached. The switching rod 10 If both the second contactor A and that has a locking head 13 at each end, 25 the first contactor B is de-energized, the break contacts to the locking heads 15 of the 11 and 12 located above cannot establish the star connection, since the two-fold provided switching rod 15 together locking head 14 of the first contactor B the forfeiture. At the opposite end of the rotary locking head 13 of the second contactor A in a lever 1, the switching rods 4 are attached. holds such a position that the normally closed contacts 11 and

The fixed contacts are opened by Kon- 30 12. However, the first contactor B receives

clock plates 26 to 34 formed. Current, the switching rod 15 is locked with the

If the contactors and B are de-energized, all gelungskopf 14 are withdrawn and the latter from

clocks open and the motor is not connected locking head 13 is lifted, which, if

(Fig. 1). To start the engine in the star the second protection is de-energized, due to the

circuit, contactor B is energized. As a result, 35 compression spring 5 moves the contacts 11 and 12 to close.

1 sheet of drawings

Claims (3)

1 2 - create. This object is achieved with a switch of the claims: initially mentioned type according to the invention because by that by tightening the second 1. Star-delta starter for asynchronous contactor when the first contactor is switched on, the three-phase motors can be brought about with a single basic circuit and by dropping the plate and two contactors for switching the second contactor when the first contactor is switched on in star and delta connection, whereby the star connection can be restored.
Tightening of the first contactor, the star connection The one contactor therefore switches to each of the mains, characterized in that 'each phase is one winding terminal of the motor and the other contactor, when the second contactor (A) is tightened, switches the other winding terminal switched-on first contactor (B ) the triangles can be brought about either on a star point or on the circuit and through the drop in the other associated network phases. The two second contactors when the first contactor is switched on can be restored with a few Kon contactors to be switched. clocks can be designed in a spatially compact manner without the 2. Star-delta starter according to claim 1, 15 security would suffer because inadmissible characterized in that double circuits cannot occur through the first. The contactor (B) with make contacts (16, 17, 18) per starter preferably works automatically. one of the network phases (20, 21, 22) to each of the Winding terminals (U, V, W) is switchable and is in that through the first contactor with Arbeitsdaß through the second contactor (A) with Arbeitskon- 20 contacts each one of the network phases to each Wicktakten (6, 7, 8) the respective Mains phases can be switched to the lungsklemme and that through the second opposite winding terminals (X, Y, Z) contactor with working contacts the respective mains switchable and with break contacts (11, 12) these phases can be switched to the opposite winding terminals opposite winding terminals on a men and with break contacts these against Star point are switchable. 25 overlying winding terminals on a star 3. Star-delta starter according to claim 2, are point switchable. This design offers the advantage of a compact switch (A) when the first contactor (B) is not energized, an intermediate system of the starter with a completely safe switching program between its working position. Proceeding from this, there is a (both contactors energized) and its rest position 30 further development of the invention in that the second (only the first contactor is energized) has such that it. When the first contactor is not energized, a contactor intervenes with a locking head (14) of the first position between its working position (both contactors (A) on its switching rod (15) energized in the contactors) and its rest position (only this intermediate position is held and the first contactor is closing is excited) has such that it is prevented by one of the normally closed contacts (11,12). 35 Locking head of the first contactor on its Contact rod is held in this intermediate position and prevented from closing the normally closed contacts. This results in tightening the first one Contactor and lifting the intermediate position interlocking of the second contactor the star connection, without The invention relates to a star-delta that the star point interconnecting Kon starters for asynchronous three-phase motors with a clock are already closed beforehand, so that each single base plate and two contactors for switching the possibility of an unwanted switching status of the motor in star and delta connection is closed. whereby the tightening of the first contactor is the star causes. 'play explained in more detail. In the drawing shows It is known that for starting asynchronous Fig. 1, 2 and 3 circuit diagrams of the starter with Three-phase motors with automatic switching from open circuit, with star connection or with Star-to-delta connection devices used delta connection, which ordinarily involve the use of three 50 F i g. 4, 5 and 6 each have a vertical section through special contactors and a delay starter in a plane IV-IV in FIG. 7, with devices which are switched according to the individual figures according to the switching states. Such devices are relatively Fig. 1, 2bzw. 3 reproduced,
complicated and take up a considerable amount of space F i g. 7 is a plan view of the starter, in claim. 55 Fig. 8 is a plan view of the starter, wherein There is also a starter known (prospectus an insulated contact carrier plate, movable lever No. 1149 from JA Crabtree & Co. Ltd., Octo- and electrical necessary for the star connection about 1953), in which two contactors with six contact plates each are omitted are and
clocks housed in a common housing Fi g. 9 is a partial sectional view in a plane IX-IX are. The stem connection 60 in FIG. 7th and with the other contactor the triangle connection. According to the circuit diagrams according to FIGS. 1 to 3, a manufactured. Also by means of these two alternatively connected contactors 1 pivotably pulled on a mounting 2 with their mutual interlocking. At 3, the shift lever 1 is connected to a circuit with a spatially large, ratio rod 4, which is given a moderately complicated starter by a second contactor A. 65 against the force of a return spring 5, the one In contrast, the object of the invention is compression spring, can be moved in its longitudinal direction, has the starter as a simple, compact, safe and working contacts 6, 7 and 8, which is connected to the energized second contactor A on stationary with working and inexpensive to manufacture switching unit Contact-