System circuit grooves

 

(57) Abstract:

The invention relates to electrical machines, namely, devices for closure (closure) of the slots, and the system circuit filled with conductive rods or reels of the slots of the stator body of sheet steel electrical machines with end locks grooves, which consist respectively of the upper prismatic body, on the lower side of which has a surface that passes obliquely, and a lower prismatic body facing to the upper body, the surface of which is inclined relative to the bottom surface of the upper prismatic body in the opposite direction, and direct the jamming may be accomplished by relative displacement of both prismatic phone according to the invention the lower and upper prismatic body have a contact surface for the transmission of forces from the conductive rod or coil on the upper prismatic body along the entire length mostly only on its middle part. The technical result consists in the optimal use of elasticity of the upper prismatic body in the transverse direction. The force from the conductive rod or ratuszniak large springy shrinkage in the radial direction, which, in turn, can compensate for shrinkage in the winding structure. Thus, increased maintenance intervals and increase the operational availability of the machine. 7 C.p. f-crystals, 7 Il.

The invention relates to a system circuit of the slots of the stator body of sheet steel electrical machines with end locks grooves, which are respectively at least one of the upper prismatic body, on the lower side of which is inclined surface, and a lower prismatic body, the upper surface of which is directed toward the upper body are inclined relative to the inclination of the lower surface of the upper body in the opposite direction.

System circuit grooves of this type are known, for example, from application laid Switzerland N 525281.

The technological basis and the level of technology.

Located in the slots of electrical machines conductive rods, reels, and affect in the interaction of the current flowing through the conductors of electric current and magnetic field in the air gap power alternating directions. Therefore, you must be laid firmly these conductors in the slots without gaps. Elshinta known systems snapping grooves conductive rods or coils pressed with compensation of trapezoidal strips and wedges to the base of the grooves. To compensate for sedimentary phenomena during operation, provides or springy strip, such as a wavy spring (tiled application Germany N 2165727), between the slot wedge and winding, or the slot wedge acts as a spring element, as in the case mentioned at the beginning tiled application Switzerland N 525581.

In the system in accordance with tiled application Switzerland N 525581 used the so-called double-beveled wedges. These wedges are held by two or three lengths of the partial bodies from sheet steel and therefore can wedge themselves individually and also to catch up. For this reason, in comparison with the system in accordance with tiled application Germany N 2165727 requires only a relatively small shrinkage springs.

Summary of the invention.

Proceeding from the known. the basis of the invention lies in the task of creating a system circuit grooves, which dispenses springy strips and despite this allows more springy shrinkage.

In accordance with the invention this problem is solved due to the fact that the introduction of the efforts of a conducting rod or coil on the prismatic body is carried out along the entire length mostly just maintenance of effort other species can now much better to use the elasticity of the upper prismatic body transversely to its longitudinal direction. Thus there is a large spring shrinkage in the radial direction, which can better compensate for shrinkage in the winding structure. This ensures increased maintenance intervals and increase the availability of the machine.

In more detail below using the drawing explains the examples of carrying out the invention, and also achieved it by using benefits.

A brief description of the drawings.

In the drawings is a schematic representation of examples of execution of the invention, showing the following:

Fig. 1 is a first exemplary embodiment of the invention, illustrating the two parts of the lock grooves, in which the introduction of the effort is carried out through the convex and concave surfaces with different radii of curvatures:

Fig. 2 is a second exemplary embodiment of the invention, illustrating the two parts of the lock grooves, in which the introduction of the effort is carried out with the help of exaltation in the form of strips in the middle part of the lower body;

Fig. 3 is a longitudinal section of the upper prismatic body system circuit in accordance with Fig. 2;

Fig. 4 is a top view of the upper prismatic body system circuit in Fig. 2;

Fig. 6 a modification is shown in Fig. 1 option complete with gasket between the winding and the lower prismatic body, with the upper surface of the strip is curved convex and the lower surface of the lower body is curved concave;

Fig. 7 a modification is shown in Fig. 2 version complete with gasket between the winding and the lower prismatic body, with the upper surface of the strip is elevated in the form of strips.

Examples of execution of the invention.

In the drawing position 1 represents the upper prismatic body, called in the next slot wedge, and position 2 indicated a lower prismatic body, called in the next ledge. The slot wedge and the protrusion is pressed together has an insulation layer 3 of the conductive rod 4 to the base of the groove 6, vyshtampovannye in the body 5 of the stator sheet steel, so that the slot wedge 1 rests on the recess 7 in the body 5 of the stator sheet steel.

The slot wedge 1 consists of high-strength glass fibre-reinforced synthetic material and is flexible transversely to its longitudinal direction. The bottom is facing the ledge 2 surface 8 of the slot wedge 1 is curved concave. The radius of curvature of the hereafter is with curvature is denoted by rz. The curvature radius rtothe lower surface 8 of the slot wedge 1 is greater than the radius of curvature rzthe upper surface 9 of the projection 2, namely, greater by at least 5%.

Concave surface 8 on the slot wedge 1 flat inclined in the longitudinal direction of the wedge (Fig. 3). The surface 9 on the tab 2 also has the same slope, but it goes in the opposite direction (Fig. 5). The slot wedge 1 and tab 2 is formed so double-beveled wedge so that when the axial valliani protrusion 2 in the slot wedge 1 creates pressure on the conductive rod 4 in the radial direction. When moving the lining 10 of the layered synthetic material protects the insulation 3 of the conducting rod 4 and at the same time may serve to compensate for process tolerances at the level of the conductive rod 4 in the radial direction.

The axial length of the slot wedge 1 in the case of the example chosen in such a way that it overlaps the radial vent groove in the body of the stator of sheet steel and ends approximately in the middle of both neighboring ventilation slots. The position of these ventilation slots indicated in Fig. 4 by arrows L. needless to say, the slot wedge may overlap changepasswd be shifted by using the appropriate tool or device tab 2 relative to the slot wedge.

Such a device is described, for example, paved the application Switzerland N 525581. There is also in all essential details describes the installation of the system described above double-beveled wedges. Additionally, you would specify that before pressing protrusions 2 conductive terminals 4 or coils are pre-processed in the groove 6 by heating and under pressure. This usually is due to the fact that the groove is temporarily closed and between the temporary locking groove and the conductors are invested filled with the operating environment of the tubes or hoses. Thus the system of conductors is precipitated in the groove 6. In this case, the resulting first described the effects of system load conductors do not lead more dangerous phenomena of attenuation. If in spite of this such phenomena appear, then secure with the invention a large radial springy shrinkage of the slot wedge 1 compensates for these effects. Due to the concave-convex of the execution of the surfaces 8 or 9 introduction efforts in the slot wedge 1 is carried out only in the middle part, and there is a relatively large spring shrinkage (dimension f in Fig. 1) until both surfaces are not coinage beveled wedge bottom surface 8' of the wedge 1 is made flat. Tab 2 except passing in the longitudinal direction of the protrusion exaltation 12 in the form of the strap also has a flat surface 9'. Eminence 12 in the form of strips preferably made as one piece with the tab 2. Its width is approximately 20% of the width of the groove 6, in a typical case, from 10 to 15 mm when the width of the groove 40 to 75 mm

The height of exaltation 12 in the form of a strap can be adjusted to a prescribed maximum springy shrinkage f' and is from 1 to 2 mm. In the rest of the design and installation of double-beveled wedge in accordance with Fig. 2 correspond to the design and installation of systems in accordance with Fig. 1.

Alternative exaltation 12 in the form of strips may also be performed on converted to tab 2 surface 8 of the slot wedge 1 and preferably made as one piece with the slot wedge. Facing the slot wedge 1 surface 9 of the projection 2 is made in this case is also flat. This option in detail in the drawing are not represented.

Presented on Fig. 6 and 7 variant of the invention have as a common characteristic strips 13 and 13', which in combination with the tab 2 increase springy shrinkage f (although to a lesser extent than in the variants according to Fig. 1 and 2).

In sist the radius of curvature r'z, while facing the ledge 2 of the upper surface 15 of the strip 13 is curved convex with a curvature radius ru. By analogy with Fig. 1 the radius of curvature r'zmore curvature radius ru. As the strip 13 performs all or part of the function of the sliding lining 10, it can be made thinner or may be absent altogether, so that the groove does not need to do deeper.

In the system in accordance with Fig. 7, the gasket 13 is turned on to the ledge 2 surface 16 exaltation 12 in the form of strips, while the bottom facing the strip 13' surface 17 of the protrusion 2 is flat. Here, by analogy with Fig. 6, the gasket 13' may also fully or partially perform the functions of the sliding lining 10, so that it can be made thinner or absent, so that the groove 6 is not necessary to do more deep. This embodiment of a suitable, in particular, for the purposes of modernization, because the actual double-beveled wedge may remain unchanged.

Needless to say that the system in accordance with Fig. 7 exaltation 12 in the form of strips may also be performed on the bottom surface 17 of the protrusion 2, while the upper surface 16 Proclus is on wedge 1 in the radial direction is smaller than in the variants without strip 13 or 13', because here the elasticity in the transverse direction is formed with the elasticity of the slot wedge.

The list of symbols

1 - slot wedge

2 - the ledge

3 - insulation

4 - conducting rod

5 - the body of the stator sheet steel

6 - groove in the body of the stator sheet steel 5

7 is a recess in the body of the stator sheet steel 5

8 - concave surface of the slot wedge 1

8' - flat surface of the slot wedge 1

9 - convex surface of the protrusion 2

9' is a flat surface of tab 2

10 - moving lining

11 is an axial groove of the slot wedge 1

12 - placket

13, 13' - strip

14 - concave surface of the protrusion 2

15 - convex surface of the strip 13

16 - the upper surface of the strip 13'

17 - the bottom surface of tab 2

f,f' - springy shrinkage

L - position ventilation slots

rtothe radius of curvature of the concave surface of the slot wedge 8

rzthe radius of curvature of the convex surface of the protrusion 9

r'zthe radius of curvature of the concave surface of the protrusion 14

ruthe radius of curvature of the convex surface of the strip 153

1. System for R is determined by the limit of locks grooves, which consist respectively of at least the upper prismatic body, on the lower side of which has a surface that passes obliquely, and a lower prismatic body, top, facing to the upper body surface which is inclined relative to the bottom surface of the upper body in the opposite direction, and direct the jamming may be accomplished by relative displacement of both prismatic bodies, characterized in that the lower and upper prismatic body have a surface of contact for the transmission of forces from the conductive rod or coil on the upper prismatic body along the entire length mostly only on its middle part.

2. The system under item 1, characterized in that the said lower surface of the upper prismatic body curved concave and mentioned that the upper surface of the lower prismatic body convex curved, and the curvature radius rkthe bottom surface of greater radius of curvature rzthe upper surface.

3. The system under item 2, characterized in that the curvature radius rkbottom surface, at least 5% larger than the radius of curvature rzthe upper surface.< prismatic body 1 surface 9 at the middle section extending in the longitudinal direction of the groove exaltation 12 in the form of strips, which is preferably made as one piece with the lower prismatic body 2.

5. The system under item 1, characterized in that the upper prismatic body 1 is turned on to lower prismatic body 2 surface 8 in the middle part extending in the longitudinal direction of the groove exaltation 12 in the form of a strap, which is preferably made as one piece with the upper prismatic body 1.

6. The system under item 4 or 5, characterized in that the elevation in the form of a strap is a maximum of one third of the width of the groove.

7. The system under item 1, characterized in that is provided by the gasket, the upper surface of which is directed toward the lower prismatic body, a curved convex, and that converts to seal the lower surface of the lower body curved concave and the curvature radius rkthe bottom surface of the lower prismatic body is greater than the radius of curvature rzthe upper surface of the strip.

8. The system under item 7, characterized in that the curvature radius rkthe bottom surface of the lower prismatic body by at least 5% more than the radius of curvature rzthe upper surface of the strip.

 

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