Stator core through pins of split design

FIELD: electricity.

SUBSTANCE: invention refers to the sphere of electric engineering and may be used to make a generator stator. The through pin (4) for magnetic stator core (1) of the generator is inserted into an opening (6) in plates (3) of the stator core used for tightening of the core components. The through pin (4) consists of at least two longitudinal members (9, 10) interconnected by at least one connecting element (11). Besides, the assembly method is described for the through pin (4) intended for plates (3) of the generator stator core.

EFFECT: reducing labour intensity of stator manufacture due to potential replacement of through pins located below the foundation bed level, and this replacement does not require special tools or lifting of the frame thus making such replacement easy and cost-effective.

12 cl, 7 dwg

 

The technical field

The present invention relates to cross-hairpin magnetic core of a generator stator, which is inserted into the hole present in the plates of the stator core, to ensure the tightening of the core components. In addition, the present invention relates to a method of assembling a composite end-to-end studs to the plates of the magnetic core of a generator stator, consisting of several individual parts.

Prior art

Large generators are the cores of the stator, which usually contain a large number of thin annular plates that are brought together and compressed to education cylindrical stator core that is installed in the frame. The known magnetic cores of some types of such stators of the generators require installation of the bolts to ensure the density of the tightening of the core components. These bolts are parallel to the axis of the stator and located at the outer and inner periphery of the magnetic core. These bolts are called "end-to-end hairpins" and is located in the axial direction of the through holes provided in the plates of the stator core. End-to-end stud is supplied on both ends of their axes nuts that are tightened, for example, using hydraulics to hold the core in assembled position. In addition, end-to-end studs usually Auburn what you're dielectric isolation.

The weakening of these end-to-end studs or defects plates affect the integrity of the patterned core. If tightening the through bolts were loose, re-tighten these bolts may not be enough. In this case, replacement of end-to-end studs. Another case, when replacing end-to-end studs, is a modification of the generator.

Often, however, the generator is in the space below the normal floor level. Thus, there are often difficulties due to insufficient clearance between the end of the stator core and the wall of the Foundation or floor level of the building. This deficiency prevents axial lumen is inserted through the studs into the holes in the stator core. In order to overcome the insufficiency of the lumen, one solution offers the lifting frame with the core to obtain the necessary space for the introduction of end-to-end studs.

Alternatively, US 4845836 proposes to use a special mechanism for feeding through the studs through the holes of the stator core during the initial filing by the end of the hole along a line forming an acute angle with the axis of the hole. To discard the pass-through pins from an acute angle holes, under which they served, and their alignment with the axis of the holes in the mechanism used several rollers. The mechanism for US 4845836 relatively complicated, and with whom persons difficult to use, especially if you need to replace all end-to-end studs.

The invention

Accordingly, the technical problem to be solved by the present invention is to avoid the disadvantages of previous techniques, and providing advanced solutions for the replacement of end-to-end studs located below the level of the basement floor. In addition, in order to make this change easy and cost-effective, does not require special tools and lifting.

This task is solved by the device under item 1 of the formula of the invention and the method according to p. 11 formula. Preferred embodiments of the present invention are described in dependent claims.

In accordance with the present invention, the proposed end-to-end hairpin magnetic core of a generator stator, which is inserted into the hole present in the plates of the stator core, to ensure the tightening of the core components. End-to-end hairpin differs in that it contains at least two longitudinal elements which are interconnected via at least one connecting element.

This prevents the disadvantages of the previous techniques and provides an advanced solution for the replacement of end-to-end studs located below the level of the basement floor. This is achieved in the basis of the nom with a composite end-to-end studs to the plates of the magnetic core of a generator stator, consisting of several individual elements. The maximum length of the individual elements should be determined by the existing gap between the stator of the generator and Foundation walls and/or the existing gap between the stator of the generator and turbine. In addition, you do not need special tools or lifting frame that makes replacement easy and cost effective. The connection elements may be performed by various means, for example, bayonet, connection, connection, with the appropriate form elements, or other suitable means of connection.

The preferential option for the implementation of the present invention assumes that the longitudinal elements end-to-end studs made of alloy with high tensile strength. Due to this can be achieved by a large tensile stress without material fatigue end-to-end studs, and consequently, without the need for an emergency replacement studs.

Another predominant variant implementation assumes that the longitudinal elements end-to-end studs made of a nonmagnetic alloy. Thus, through the pin will not affect the electromagnetic properties of the generator.

Additional preferential option for the implementation of the present invention assumes that at least one end of the longitudinal element through SPI is ICI has an internal thread. Thus, the longitudinal elements of the end-to-end studs can be connected to each other by threads. Screw connection is simple in construction and easy to assemble using only the tools usually available at the place of installation of the generator. External longitudinal elements studs provided on one end of the external thread for the nut to be tightened from the outside in the final installation of the stud in the hole. However, the inner longitudinal element(s) studs may have two internal threads that have to be joined at both ends by means of threaded connecting elements.

Another preferred implementation of the present invention assumes that the two ends of the connecting element provided with an external thread. The connecting element may have a longitudinal shape, but is much shorter than the longitudinal elements end-to-end studs. It can be made of a material with high tensile strength, mainly, of the alloy, which can surface after the two opposite ends of the coupling element to be chopped or knurled outer thread. To save a threaded connection with the internal thread on the longitudinal elements end-to-end studs, can be used lock washers and/or nuts.

the Dean predominant aspect of this alternative implementation is the coupling element is provided with a Central section having a hexagonal shape. The Central section of the coupling element may have a diameter greater than the two ends of the connecting element. Hexagon shape facilitates the application of a hydraulic wrench or a regular wrench for Assembly of the connecting element together with the longitudinal element through the studs during installation of the composite end-to-end stud in the hole. Of course, there are also alternative ways of screwing a screw connecting element, for example, in the Central part of the coupling element can be provided with small holes which are perpendicular to the axis of the connecting section. To build into these holes can be inserted rod, acting as a lever.

In addition, it is preferable that the interconnected longitudinal elements end-to-end studs were surrounded by dielectric insulation. Dielectric insulation eliminates short circuits in the stator of the generator, which potentially can be caused by end-to-end hairpins without isolation. In addition, the dielectric insulation prevents the danger of personnel conducting the Assembly, an electric voltage. One way of applying the dielectric isolation could be wrap around Squaw is Noah pins while inserting it into the hole. However, it has the disadvantage that during insertion of the stud into the hole, wrap may be damaged or expanded.

Thus, primarily, the dielectric insulation is made of tubes of reinforced fibers. The tubes may be made of flaky manually fibrous material reinforced epoxy resin. Preferred reinforced dielectric material could be, for example, fiberglass. Tubes of fiber reinforced not only provide dielectric isolation, but also provide a certain stability and rigidity to avoid deployment or damage to the insulation material during insertion into the hole. In addition, several individual tubes easier to connect with each other during the Assembly of the end-to-end studs, because the ends of the tubes are equipped with bushings, which can also serve as a place of glue.

In addition, it is preferable that the tube, fiber-reinforced, provided with a liner of low friction, for example PTFE (poly-tetrafluoroethylene). Liner with a low coefficient of friction improves the ability of the sliding tube of the optical fiber during installation on the elements end-to-end studs and protects end-to-end studs from damage.

Finally, it is preferable that the through pin is made of p is at least three longitudinal members and two connecting elements. The two outer longitudinal element of the studs is not symmetric, i.e., to the outer ends of the longitudinal elements of the studs have an external thread for threaded connection with threaded rod, as shown in the figure. The inner ends of the longitudinal members of the studs are threaded for threaded connection with the connecting elements. The inner longitudinal element through the stud is threaded at both ends for connecting the respective connecting elements with two outer longitudinal elements end-to-end studs.

The method of assembling a composite end-to-end studs for a magnetic core of a generator stator, according to the present invention, consisting of several individual elements, contains the following steps:

- submission of the longitudinal element through the studs into the holes made in the plate core;

connection of the longitudinal members end-to-end studs with connecting elements during insertion into the holes.

In accordance with the preferred embodiment of the method of the longitudinal elements end-to-end studs are connected to each other by threaded through the connecting elements.

In accordance with another preferred embodiment of the method several separate isolating the x tubes are inserted together with the longitudinal elements through the studs into the holes and glued together to surround the through studs.

Brief description of drawings

A more complete evaluation of the invention and many of its attendant advantages will be easily made as they become better understood by the subsequent detailed description with accompanying drawings, in which:

Fig.1 illustrates a perspective view in partial section of a generator stator having a through stud according to the present invention;

Fig.2 illustrates the details of the end-to-end studs of the present invention, as shown in Fig.1;

Fig.3 illustrates a perspective view in partial section of the assembled end-to-end studs of the present invention, as shown in Fig.1;

Fig.4 illustrates a detailed section of the connection end-to-end studs of the present invention, as shown in Fig.1;

Fig.5A illustrates a view of one end of the longitudinal element through studs;

Fig.5b illustrates a section V-V in Fig.5A;

Fig.6A illustrates a view of a connecting element;

Fig.6b illustrates a section VI-VI from Fig.6A;

Fig.7a illustrates a section of one end of the tube of the optical fiber; and

Fig.7b illustrates a section of the opposite end of the tube of fiberglass with Fig.7a.

Description of the preferred embodiments

In the figures the same reference position indicate the same or corresponding parts in several views. First Pres is respectful variant embodiment of the invention shown in Fig.1 view in perspective of a stator 1 with a partial cut. The drawings are purely schematic sketches and serve only the purposes of explanation.

In this embodiment, the stator 1 is almost cylindrical frame 2, with a few pillars of the Foundation. One end of the stator facing the turbine, and the opposite end facing the Foundation. The stator 1 includes many located along the axis of the annular thin plates 3, which are collected together and compressed for forming a cylindrical stator core. For explanatory purposes, the rotor, which is located coaxially inside the stator, not shown.

In the stator 1 of the generator to enable tightening of the core components, installed end-to-end studs 4. These studs 4 are parallel to the axis of the stator and located at the inner periphery of the magnetic core. End-to-end studs 4 are along the axis through the holes in the plates 3 of the stator core. Through pins 4 provided on both ends of the nuts 5, which are tightened to hold the support system core in assembled position.

Additional details are shown in Fig.2-7 which illustrate the Assembly of node 7 through studs and the end-to-end connection pins 4 in the detailed views.

In Fig.2 interconnected three longitudinal element 9, 10 through the pins using two connecting elements 11. Two external about the Aulnay element 9 through the studs is not symmetric, i.e., the outer ends of the longitudinal members 9 studs have an external thread for connection with the nut 5, as shown in Fig.1.

The inner ends of the longitudinal members 9 through the studs are threaded for threaded connection with the connecting elements 11. The inner longitudinal element 10 through the stud is threaded at both ends to connect the respective connecting elements 11 with two outer longitudinal elements 9. Detailed view of one end having an internal thread 18, shown in Fig.5A and 5b. Internal thread on this version of the implementation is the size of the M27. To hold the longitudinal element of the studs in position during Assembly and prevent it from rotation, the final section contains a hexagonal section 19, comfortable to hold regular wrench size 36. The longitudinal elements 9, 10 end-to-end studs made of non-magnetic alloy with high tensile strength, which may be subjected to surface treatment, for example, nitrogen hardening. The longitudinal elements 9, 10 end-to-end studs, in a preferred variant implementation, have a length in the range between 1500 mm and 2000 mm

As can be seen in Fig.3 and 4, and particularly in Fig.6A and 6b, the connecting element 11, in this variant implementation, made of metal turning and has the two opposite end 14 with an external thread.

The Central section 15 of the connecting element 11 has a larger diameter than the ends with thread, and made in the form of hexagon under the wrench or impact wrench. The connecting element 11 is a longitudinal detail cylindrical shape. The connecting element 11 is made of non-magnetic alloy with high tensile strength, which may be subjected to surface treatment such as nitriding. The total length of the connecting element 11 by this option is 200 mm, and the outer thread has a size M27. The hexagon of the Central section 15 has a bigger wrench size 36.

End-to-end studs 4 are surrounded by dielectric insulation 8, shown in Fig.7a and 7b. The insulation on this version of the implementation is made in the form of tubes 13 fiberglass with inner liner 12 of the PTFE material. Tube 13 made of fiberglass have the same length as the longitudinal elements 9, 10 end-to-end studs, and are inserted into the holes 6 during insertion of the longitudinal members 9, 10. During insertion into the holes 6, several tubes 13 fiberglass glued to each other using a suitable adhesive, for example, polyester resin or the like. The liner 12 PTFE improves the ability of the tubes 13 of the optical fiber to slide during installation of the longitudinal members 9, 10 through studs and protects quesnoy pin 4 from damage. The liner 12 of the PTFE material has a thickness of several microns, for example, 0.20 mm Dielectric insulation eliminates the circuit in the stator of the generator, which could potentially be caused through pins 4. In addition, the dielectric insulation 8 prevents the risk of electrical injury to personnel conducting the Assembly.

As can be seen in Fig.7a, the tube 13 of the optical fiber provided with a socket 16 having an inner diameter greater than the remainder of the tube 13 of the optical fiber, and contains no liner (PTFE). The socket 16 corresponds to the sleeve 17 (as shown in Fig.7b) having a smaller outer diameter than the remainder of the tube 13, so that the two tubes 13 of the optical fiber can be connected by installing the bushing 17 in the socket 16 with the application of glue to the joint surfaces.

For installation of through pins 4 holes 6 of the generator 1, the longitudinal elements 9, 10 are served in the hole 6. At the time of filing of the longitudinal members 9, 10 through the pins in the holes 6, the longitudinal elements 9, 10 are connected by a thread with connecting elements 11. To connect the longitudinal members 9, 10 through bolts connecting element 11, to provide the desired torque, is applied corresponding to the torque, which in the preferred embodiment, is about the olo 730 Nm. In addition, when applying longitudinal members 9, 10 end-to-end studs, there is a dielectric insulation 8, and the tube 13 is made of fiberglass, which are adjusted to each other, entered, collected, and stick together during their introduction.

Obviously, in light of the above aspects of the invention, numerous possible modifications and variations. Therefore, it should be understood that features of the claims, it may be implemented differently than described.

Reference designations

1 the stator

2 frame

3 the core plates

4 end-to-end hairpin

5 nut

6 hole

7 stud Assembly

8 dielectric isolation

9 longitudinal element studs

10 longitudinal element studs

11 connecting element

12 liner (PTFE)

13 tube fiberglass

14 the end of the coupling element

15 Central plot

16 Jack

17 sleeve

18 internal thread

19 hexagonal section.

1. 1. End-to-end pin (4) for a magnetic core of the stator (1) generator installed in the hole (6) made in the plate (3) of the stator core to tighten the elements of the core, characterized in that the end-to-end pin (4) contains at least two separate longitudinal element (9, 10), which are interconnected, less than the least one connecting element (11), with interconnected longitudinal elements (9, 10) end-to-end studs surrounded by dielectric insulation (8), with dielectric isolation (8) made of tubes (13), fibre reinforced.

2. End-to-end stud (4) on p. 1, characterized in that the longitudinal elements (9, 10) end-to-end studs made of alloy with high tensile strength.

3. End-to-end stud (4) on p. 1, characterized in that the longitudinal elements (9, 10) end-to-end studs made of a nonmagnetic alloy.

4. End-to-end stud (4) on p. 1, characterized in that at least one of the ends of the longitudinal members (9,10) end-to-end studs with internal thread.

5. End-to-end stud (4) on p. 4, characterized in that the two ends of the connecting element (11) provided with an external thread.

6. End-to-end stud (4) on p. 1, characterized in that the connecting element (11) is provided with a Central section having a hexagonal shape.

7. End-to-end stud (4) on p. 1, characterized in that the tube (13), fiber-reinforced, provided with a liner (12) from a material with a low coefficient of friction, for example PTFE.

8. End-to-end stud (4) on p. 7, characterized in that the tube (13), fiber-reinforced, provided with a liner of PTFE material.

9. End-to-end pin (4) according to any one of paragraphs.1-8, characterized in that the end-to-end pin (4) you shall Olney from, at least three longitudinal elements (9, 10) and two connecting elements (11).

10. The method of assembling a composite end-to-end studs (4) plates (3) magnetic
the stator core of the generator, consisting of several individual elements, containing the following steps in which: serves longitudinal elements (9, 10) through the studs into the holes (6) made in the plate (3) core;
connect the longitudinal elements (9, 10) end-to-end studs with connecting elements (11) during insertion into the holes (6), with interconnected longitudinal elements (9, 10) end-to-end studs surrounded by dielectric insulation (8), with dielectric isolation (8) made of tubes (13), fibre reinforced.

11. The method according to p. 10, in which the longitudinal elements (9, 10) end-to-end studs are connected to each other via connecting elements (11) by means of a thread.

12. The method according to p. 10, which together with the longitudinal elements (9, 10) through the studs into the holes (6) to impose and glue together several separate insulating tube surrounding the end-to-end stud (4).



 

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1 dwg

FIELD: motors and pumps.

SUBSTANCE: invention relates to the electromagnetic motor with low heat generation. The electromagnetic motor contains at least one stator, including at least one winding. The winding is made by the wire, its outlets are respectively connected with positive and negative poles of the power source. Between the winding outlet and negative pole of the power source the switch is connected, it is located near the rotor shaft, at that the switch actuator is located on the shaft end. At that the magnetic field in created in the winding in two directions: at electric current of power source supply and disconnection, respectively.

EFFECT: enhanced efficiency of motor operation.

23 cl, 15 dwg

FIELD: electricity.

SUBSTANCE: in a non-contact electrical machine the shaft with rotor are made as a cylinder of uniform cross-section with slots for rotating rectifiers. At that diameter of the movable magnet core of the rotary transformer is equal to the rotor diameter while bore diameter of the fixed magnet core of the rotary transformer is equal to the stator bore diameter.

EFFECT: improving reliability and energy efficiency, increasing output power of the non-contact electrical machine.

2 cl, 4 dwg

FIELD: electrical engineering; mechanical design of commutatorless magnetoelectric machines.

SUBSTANCE: rotor magnetic system has more than two magnetically permeable steel laminations with pole horns formed by prismatic tangentially magnetized N-S permanent magnets placed inside laminated stack; inner and outer diameters of laminations are uninterrupted and rectangular prismatic magnets are installed inside them so that distance over outer arc between external planes of two adjacent magnets of unlike-polarity poles is shorter than that over internal arc between same planes; magnets do not contact one another and have at least one projection on inner diameter for coupling with rotor shaft.

EFFECT: enhanced manufacturability.

3 cl, 2 dwg

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