ES2708398A1 - ANNULAR PRESSURE PLATES FOR ROTARY ELECTRICAL MACHINES (Machine-translation by Google Translate, not legally binding) - Google Patents
ANNULAR PRESSURE PLATES FOR ROTARY ELECTRICAL MACHINES (Machine-translation by Google Translate, not legally binding) Download PDFInfo
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- ES2708398A1 ES2708398A1 ES201831225A ES201831225A ES2708398A1 ES 2708398 A1 ES2708398 A1 ES 2708398A1 ES 201831225 A ES201831225 A ES 201831225A ES 201831225 A ES201831225 A ES 201831225A ES 2708398 A1 ES2708398 A1 ES 2708398A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/161—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
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- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
DESCRIPCIONDESCRIPTION
Placas anulares de presion para maquinas electricas rotativas.Annular pressure plates for rotating electric machines.
OBJETO DE LA INVENCIONOBJECT OF THE INVENTION
La presente invention tiene por objeto unas placas de presion para maquinas electricas rotativas.The present invention has as its object pressure plates for rotating electric machines.
Su uso se engloba dentro de diferentes sectores tecnicos que implican el uso de maquinas electricas rotativas, por ejemplo y sin caracter limitativo, los turbogeneradores.Its use is encompassed within different technical sectors that involve the use of rotating electric machines, for example and without limiting character, the turbogenerators.
La principal ventaja de las placas de presion segun la presente invencion, consiste en que estan configuradas de tal forma que pueden sustituirse, en caso de ser necesario, sin que para ello sea preciso desmontar ningun componente de maquina electrica rotativa, como por ejemplo, los arrollamientos estatoricos.The main advantage of the pressure plates according to the present invention is that they are configured in such a way that they can be replaced, if necessary, without this requiring the disassembly of any component of a rotating electric machine, such as, for example, stator windings.
ANTECEDENTES DE LA INVENCIONBACKGROUND OF THE INVENTION
Las maquinas electricas rotativas estan habitualmente provistas de un nucleo magnetico que esta sujeto por sus dos extremos mediante elementos de anclaje -por ejemplo pernosa una carcasa, a traves de unas piezas denominadas placas de presion.The rotating electric machines are usually provided with a magnetic core that is held at its two ends by means of anchoring elements-for example, a housing bolt, through parts called pressure plates.
Las placas de presion conocidas tienen, habitualmente, forma de cuerpo anular que esta delimitado por un borde exterior y un borde interior. Asimismo, a lo largo del borde interior de las placas de presion estan preferiblemente provistos unos dedos de presion, los cuales estan destinados a presionar el nucleo magnetico de la maquina electrica, y muy especialmente, unos dientes que estan habitualmente provistos en dicho nucleo magnetico. De esta forma se ejerce una presion sobre el nucleo magnetico, que esta destinada a evitar posibles vibraciones.Known pressure plates usually have an annular body shape which is delimited by an outer edge and an inner edge. Also, along the inner edge of the pressure plates are preferably provided pressure fingers, which are intended to press the magnetic core of the electric machine, and very especially, teeth that are usually provided in said magnetic core. In this way a pressure is exerted on the magnetic core, which is designed to avoid possible vibrations.
Las placas de presion deben tener buenas propiedades mecanicas, asl como una permeabilidad magnetica relativa baja para no conducir el flujo radial de la maquina, que debe circular por el nucleo magnetico.The pressure plates must have good mechanical properties, as well as a low relative magnetic permeability so as not to drive the radial flow of the machine, which must circulate through the magnetic core.
En algunos casos especialmente relevantes para los propositos de la presente invencion, como las maquinas de bajo numero de pares de polos (por ejemplo y sin caracter limitativo, uno o dos pares de polos) con altas velocidades de giro (por ejemplo y sin caracter limitativo, velocidades de giro de entre 1.500-1.800 r.pm. en el caso de maquinas de 50Hz y velocidades de giro de entre 3.000-3.600 r.pm. en el caso de maquinas de 60Hz), las placas de presion suelen fabricarse de una unica pieza, tal como se muestra mas adelante, en las figuras 1 y 2. Un claro ejemplo de este tipo de maquinas, son los turbogeneradores que son maquinas slncronas de rotor liso.In some cases especially relevant for the purposes of the present invention, as the machines with low number of pole pairs (for example and without limitation, one or two pairs of poles) with high speeds of rotation (for example and without limitation, speeds of between 1,500-1,800 r.pm. in the case of 50Hz machines and speeds of between 3,000-3,600 r.pm. in the case of 60Hz machines), the pressure plates are usually manufactured in a single piece, as shown below, in the figures 1 and 2. A clear example of this type of machines are turbogenerators that are smooth rotor synchronous machines.
Ademas, en los turbogeneradores, en caso de operation subexcitada aparece, adicionalmente al flujo radial, un flujo axial que calienta las placas de presion por induction. Existen casos de danos en las placas de presion y en el nucleo magnetico. Algunas maquinas tienen placas de presion con pantallas magneticas para evitar que estos campos magneticos axiles produzcan calentamientos excesivos.In addition, in the turbogenerators, in case of underexcited operation, in addition to the radial flow, an axial flow that heats the pressure plates through induction appears. There are cases of damage to the pressure plates and the magnetic core. Some machines have pressure plates with magnetic screens to prevent these axial magnetic fields from producing excessive heating.
Esto provoca que, si se produce un defecto en las placas de presion fabricadas de una unica pieza, para cambiarlas es preciso desmontar los devanados estatoricos de la maquina electrica rotatoria, siendo este un trabajo muy costoso. Existe por tanto la necesidad de desarrollar nuevas placas de presion que, en caso necesario, puedan sustituirse sin que para ello sea necesario tener que desmontar los arrollamientos estatoricos de la maquina electrica rotativa, lo que resultana en una reparation de mucho mas sencilla y rapida de dicha maquina.This causes that, if there is a defect in the pressure plates manufactured in a single piece, to change them it is necessary to disassemble the stator windings of the rotary electric machine, this being a very expensive job. There is therefore a need to develop new pressure plates that, if necessary, can be replaced without it being necessary to disassemble the stator windings of the rotating electric machine, which results in a much simpler and quicker reparation of said machine.
De hecho, Se han producido varios casos de turbogeneradores que han sufrido danos en las placas de presion, normalmente por operar absorbiendo energla reactiva, es decir en la zona subexcitada. La absorcion de energla reactiva se consigue disminuyendo la corriente de excitation que circula en el devanado de excitation en el rotor. Esto produce que los campos producidos por las cabezas de bobinas del estator no sean compensados por el campo del rotor. Estos campos tienen una componente axial que provoca un calentamiento adicional, por induccion, en las placas de presion.In fact, there have been several cases of turbogenerators that have suffered damage to the pressure plates, usually by operating absorbing reactive energy, ie in the underexcited area. The absorption of reactive energy is achieved by decreasing the excitation current circulating in the excitation winding in the rotor. This results in the fields produced by the stator coil heads not being compensated by the rotor field. These fields have an axial component that causes additional heating, by induction, in the pressure plates.
La operacion de las placas de presion a una temperatura elevada, por ejemplo y sin caracter limitativo superiores a 250 °C, provoca que sus propiedades mecanicas sean peores y que en algunos casos aparezcan deformaciones y grietas. The operation of the pressure plates at an elevated temperature, for example and without limiting character over 250 ° C, causes their mechanical properties are worse and in some cases appear deformations and cracks.
En el caso de los turbogeneradores, al ser maquinas de un diametro reducido, las placas de presion se suelen fabricar de una solo pieza, tal como se muestra, mas adelante, en la figura 2. Por lo tanto en caso de tener que cambiar las placas de presion es necesario desmontar primero los devanados estatoricos de la maquina, siendo un trabajo muy costoso.In the case of turbogenerators, being machines with a small diameter, the pressure plates are usually manufactured in one piece, as shown, later, in figure 2. Therefore, in case of having to change the pressure plates it is necessary to first dismantle the stator windings of the machine, being a very expensive job.
DESCRIPCION DE LA INVENCIONDESCRIPTION OF THE INVENTION
Con el fin de alcanzar los objetivos y evitar los inconvenientes mencionados en los apartados anteriores, un primer objeto de la presente invention se refiere a una placa de presion, de forma anular, para la sujecion de una maquina electrica rotativa que comprende un nucleo magnetico radial provisto de dientes, comprendiendo dicha placa de presion una pluralidad de segmentos anulares destinados a unirse entre si formando al menos una capa anular cerrada; estando cada uno de dichos segmentos delimitado por dos bordes laterales, por un borde exterior y por un borde interior provisto de dedos de presion destinados a presionar el nucleo magnetico; siendo aR la mitad del angulo que forman entre si los extremos de los dientes mas proximos a los bordes laterales de cada segmento anular, caracterizada porque el numero n de segmentos de los que consta cada capa anular cerrada, es tal que se cumple la desigualdad:In order to achieve the objectives and avoid the drawbacks mentioned in the previous sections, a first object of the present invention relates to an annular pressure plate for the fastening of a rotating electric machine comprising a radial magnetic core provided with teeth, said pressure plate comprising a plurality of annular segments intended to be joined together forming at least one closed annular layer; each of said segments being delimited by two lateral edges, by an outer edge and by an inner edge provided with pressure fingers intended to press the magnetic core; being aR the half of the angle formed between the ends of the teeth closest to the lateral edges of each annular segment, characterized in that the number n of segments of which each closed annular layer consists, is such that the inequality is met:
donde:where:
R es el radio del nucleo magnetico;R is the radius of the magnetic core;
A es la altura de los dientes;A is the height of the teeth;
B es la diferencia de altura entre los dientes y los dedos;B is the difference in height between the teeth and the fingers;
C es la mitad de la diferencia existente entre las anchuras de dientes y los dedos; yC is half the difference between the widths of teeth and fingers; Y
La condition geometrica descrita anteriormente, que cumplen los segmentos anulares de las placas de presion segun la presente invencion, garantiza que la proyeccion en el eje X del extremo interno del ultimo dedo de presion de cada uno de dichos segmentos anulares, sea mayor que la proyeccion de la parte externa de la ranura existente entre los dientes del nucleo magnetico y los dedos de presion de cada segmento anular. Esto garantiza que cada uno de dichos segmentos anulares pueda ser extraido, en caso necesario, sin que para ello sea preciso desmontar previamente otros elementos de la maquina magnetica rotatoria, tales como por ejemplo y sin caracter limitativo, los arrollamientos estatoricos (tambien llamados devanados estatoricos).The geometric condition described above, which the annular segments of the pressure plates according to the present invention fulfill, guarantees that the projection on the X axis of the inner end of the last pressing finger of each of said annular segments, is greater than the projection of the external part of the groove between the teeth of the magnetic core and the pressure fingers of each annular segment. This guarantees that each of said annular segments can be extracted, if necessary, without it being necessary to previously disassemble other elements of the rotating magnetic machine, such as, for example and without limitation, the stator windings (also called stator windings). ).
A lo largo de la presente invention debe entenderse que el "eje Y” es aquel que discurre a lo largo de la direction anular del nucleo magnetico de la maquina magnetica rotatoria, mientras que el "eje X” es aquel que discurre a lo largo de la direccion axial del nucleo magnetico de la maquina magnetica rotatoria.Throughout the present invention it should be understood that the "Y axis" is that which runs along the annular direction of the magnetic core of the rotating magnetic machine, while the "X axis" is that which runs along the the axial direction of the magnetic core of the rotating magnetic machine.
En una realization preferida de la presente invencion, cada uno de los segmentos anulares de los que consta la placa de presion esta provisto de un numero entero de dedos de presion. Esta configuration espedfica de los segmentos de presion simplifica su fabrication.In a preferred embodiment of the present invention, each of the annular segments of which the pressure plate consists is provided with an integral number of pressure fingers. This specific configuration of the pressure segments simplifies manufacturing.
En otra realizacion preferida de la invencion, cada uno de los segmentos anulares de los que consta la placa de presion esta provisto de al menos un agujero pasante. Dichos agujeros pueden utilizarse para fijar el segmento anular a la carcasa de la maquina electrica rotativa y/o para unir dicho segmento anular a otro segmento anular colindante. En una realizacion mas preferida de la de la invencion, cada uno de los segmentos anulares tiene al menos dos agujeros pasantes.In another preferred embodiment of the invention, each of the annular segments comprising the pressure plate is provided with at least one through hole. Said holes can be used to fix the annular segment to the housing of the rotating electric machine and / or to join said annular segment to another adjacent annular segment. In a more preferred embodiment of the invention, each of the annular segments has at least two through holes.
Preferiblemente, la section de los segmentos anulares es mayor en las proximidades de su borde exterior, que en las proximidades de su borde interior.Preferably, the section of the annular segments is greater in the vicinity of its outer edge, than in the vicinity of its inner edge.
La placa anular de presion segun la presente invencion puede estar opcionalmente provista, ademas, de al menos una capa anular de cubierta, formada por la union de dos o mas tramos anulares delimitados por dos bordes laterales, por un borde exterior y por un borde interior. Esta realizacion particular de la invencion es beneficiosa, puesto que la capa (o capas) anulares externas contribuyen a reducir las perdidas por el flujo axial.The annular pressure plate according to the present invention can optionally also be provided with at least one annular cover layer, formed by the joining of two or more annular sections delimited by two lateral edges, by an outer edge and by an inner edge. . This particular embodiment of the invention is beneficial, since the outer annular layer (or layers) contribute to reducing the losses by the axial flow.
En una realizacion mas preferida de la invencion, los segmentos anulares estan provistos de agujeros pasantes, los tramos anulares de la capa (o capas) anulares de cubierta estan provistos de orificios pasantes que coinciden espacialmente con los agujeros pasantes provistos en los segmentos anulares y, ademas, la extension angular de los tramos anulares es mayor que la extension angular de los segmentos anulares. De esta manera cada tramo anular cubre, al menos, la extension de un segmento anular completo y parte de la extension de un segmento anular colindante Esta realization particular de la invention es beneficiosa puesto que la capa (o capas) anulares de cubierta, ademas de reducir las perdidas por el flujo axial, al tener orificios que coinciden con los agujeros de los segmentos anulares pueden anclarse por medio de pernos, u otros medios de anclaje, a la carcasa de la maquina. De esta forma cada uno de los tramos es capaz de apretar contra la carcasa de la maquina electrica los dos o mas de los segmentos anulares que estan ubicados por debajo de dicho tramo anular, evitando posibles desplazamientos indeseados de estos segmentos anulares.In a more preferred embodiment of the invention, the annular segments are provided with through holes, the annular sections of the annular cover layer (or layers) are provided with through holes that coincide spatially with the through holes provided in the annular segments and, furthermore, the angular extension of the annular sections is greater than the angular extension of the annular segments. In this way each annular section covers, at least, the extension of a complete annular segment and part of the extension of an adjacent annular segment. This particular embodiment of the invention is beneficial since the annular cover layer (or layers), in addition to reducing the losses by the axial flow, by having holes that coincide with the holes of the annular segments can be anchored by means of bolts, or other means of anchoring, to the casing of the machine. In this way each of the sections is able to press against the housing of the electric machine the two or more of the annular segments that are located below said annular section, avoiding possible undesired displacements of these annular segments.
En las realizaciones mas sencillas de la presente invencion, los segmentos anulares de la placa de presion estan dispuestos de forma coplanar, formando una unica capa anular cerrada en la que, cada uno de los extremos laterales de cada segmento anular, esta en contacto con un extremo lateral de otro segmento anular colindante.In the simplest embodiments of the present invention, the annular segments of the pressure plate are arranged in a coplanar fashion, forming a single closed annular layer in which, each of the lateral ends of each annular segment, is in contact with a lateral end of another adjacent annular segment.
No obstante, en la presente invencion tambien se contempla expresamente la posibilidad de que los segmentos anulares esten dispuestos formando dos o mas capas anulares cerradas, situadas una encima de las otras.However, the possibility that the annular segments are arranged forming two or more closed annular layers, located one above the other is also expressly contemplated in the present invention.
BREVE DESCRIPCION DE LAS FIGURASBRIEF DESCRIPTION OF THE FIGURES
Para complementar la description que se esta realizando y con objeto de ayudar a una mejor comprension de las caracterlsticas de la invencion, se acompana como parte integrante de dicha descripcion, un juego de dibujos en donde con caracter ilustrativo y no limitativo, se ha representado el objeto de la invencion.To complement the description that is being made and in order to help a better understanding of the characteristics of the invention, a set of drawings is included as an integral part of said description, in which the illustrative and non-limiting character has been represented. object of the invention.
Figura 1.- Esta figura es una vista esquematica, en section, que ilustra una maquina electrica rotativa provista de una placa anular de presion;Figure 1.- This figure is a schematic view, in section, illustrating a rotating electric machine provided with an annular pressure plate;
Figura 2.- Esta figura es una vista esquematica, en perspectiva, que ilustra una placa de presion de la tecnica anterior; y Figure 2.- This figure is a schematic view, in perspective, illustrating a pressure plate of the prior art; Y
Figura 3.- Esta figura es una vista esquematica, en perspectiva, que ilustra una placa de presion segun la presente invention;Figure 3.- This figure is a schematic view, in perspective, illustrating a pressure plate according to the present invention;
Figura 4a.- Esta figura es una vista en planta, que ilustra esquematica como se disponen los segmentos anulares de una placa de presion segun la presente invencion, en torno al nucleo magnetico de una maquina electrica rotativa; yFigure 4a.- This figure is a plan view, schematically illustrating how the annular segments of a pressure plate according to the present invention are arranged around the magnetic core of a rotating electric machine; Y
Figura 4b.- Esta figura muestra un detalle, a escala ampliada, de la Fig. 4a.Figure 4b.- This figure shows a detail, on an enlarged scale, of Fig. 4a.
Referencias numericasNumerical references
(1) Placa de presion segun la presente invencion;(1) Pressure plate according to the present invention;
(1') Placa de presion del estado de la tecnica;(1 ') Pressure plate of the state of the art;
(2) Dedos de presion;(2) Pressure fingers;
(2') Dedos de presion de una placa de presion del estado de la tecnica;(2 ') Pressure fingers of a pressure plate of the state of the art;
(3) Pernos de anclaje;(3) Anchor bolts;
(3') Pernos de anclaje usados en placas de presion del estado de la tecnica;(3 ') Anchor bolts used in pressure plates of the state of the art;
(4) . Nucleo magnetico de la maquina electrica rotativa;(4) . Magnetic core of the rotating electric machine;
(5) Devanados estatoricos de la maquina electrica rotativa;(5) Stator windings of the rotating electric machine;
(6) Carcasa de la maquina electrica rotativa;(6) Housing of the rotating electric machine;
(7) Rotor de la maquina electrica rotativa;(7) Rotor of the rotating electric machine;
(8) Devanado de excitation de la maquina electrica rotativa;(8) Excitation winding of the rotating electric machine;
(9) Dientes del nucleo magnetico;(9) Teeth of the magnetic core;
(10) Segmentos anulares de la placa de presion segun la presente invencion;(10) Annular segments of the pressure plate according to the present invention;
(10a) bordes laterales de los segmentos anulares;(10a) lateral edges of the annular segments;
(10b) borde exterior de los segmentos anulares;(10b) outer edge of the annular segments;
(10c) borde interior de los segmentos anulares;(10c) inner edge of the annular segments;
(11) Agujeros pasantes de los segmentos anulares;(11) Through holes of the annular segments;
(12) Tramos anulares de la capa de cubierta;(12) Annular sections of the cover layer;
(2aR) angulo formado por los bordes laterales de los dientes mas proximos a los bordes laterales del segmento anular;(2aR) Angle formed by the lateral edges of the teeth closest to the lateral edges of the annular segment;
(R) es el radio del nucleo magnetico;(R) is the radius of the magnetic core;
(A) es la altura de los dientes;(A) is the height of the teeth;
(B) es la diferencia de altura entre los dientes y los dedos; (B) is the height difference between the teeth and the fingers;
(C) es la mitad de la diferencia existente entre las anchuras de dientes y los dedos;(C) is half the difference between the widths of teeth and fingers;
(X) eje axial; y(X) axial axis; Y
(Y) eje anular.(Y) annular axis.
REALIZACION PREFERENTE DE LA INVENCIONPREFERRED EMBODIMENT OF THE INVENTION
A lo largo de la presente description, asl como en las figuras, los elementos con funciones iguales o similares se designaran con las mismas referencias numericas.Throughout this description, as in the figures, elements with the same or similar functions will be designated with the same numerical references.
A continuation, se describen algunos de los posibles modos de realization preferente del objeto de la invention.In the following, some of the possible modes of preferred embodiment of the object of the invention are described.
La Figura 1 representa esquematicamente, en section, una maquina electrica rotativa que, en este caso particular y sin que ello suponga ninguna limitation, es una maquina de tipo slncrona de rotor liso, conocida como turbogenerador. Dicha maquina electrica esta provista de una carcasa 6 de seccion transversal cillndrica. En ambos extremos de la carcasa 6 esta provista una placa anular 1 de presion, segun la presente invencion, unida a la carcasa 6 por medio de pernos 3 de anclaje alojados en respectivos agujeros pasantes, provistos en la placa 1 de presion.Figure 1 schematically represents, in section, a rotating electric machine that, in this particular case and without this implying any limitation, is a smooth-rotor synchronous type machine, known as a turbo-generator. Said electric machine is provided with a casing 6 with a cylindrical cross-section. At both ends of the casing 6 there is provided an annular pressure plate 1, according to the present invention, attached to the casing 6 by means of anchor bolts 3 housed in respective through holes, provided in the pressure plate 1.
Cada una de las placas 1 de presion esta provista en su borde interior de dedos 2 de presion, que sujetan el nucleo magnetico 4 de la maquina electrica. Los devanados estatoricos 5 de la maquina salen del nucleo magnetico 4 en una parte conocida como cabeza de bobina. En este caso particular y sin que ello tenga ningun caracter limitativo, la maquina electrica rotatoria esta provista, ademas, de un rotor 7 y de un devanado 8 de excitacion.Each of the pressure plates 1 is provided on its inner edge with pressure fingers 2, which hold the magnetic core 4 of the electric machine. The stator windings 5 of the machine leave the magnetic core 4 in a part known as a coil head. In this particular case and without this having any limiting character, the rotary electric machine is provided, furthermore, with a rotor 7 and an excitation winding 8.
La Figura 2 muestra una placa de presion 1' perteneciente al estado de la tecnica, hecha de una sola pieza y provista, en su borde interior, de dedos 2' de presion. La placa 1' de presion esta unida a la carcasa de una maquina electrica rotativa por medio de pernos 3' de anclaje. Al estar hecha de una sola pieza, es imposible poder extraer la placa 1' de presion sin tener, para ello, que desmontar previamente los devanados o arrollamientos estatoricos que salen del nucleo magnetico de la maquina electrica. Figure 2 shows a pressure plate 1 'belonging to the state of the art, made in one piece and provided, on its inner edge, with pressure fingers 2'. The pressure plate 1 'is attached to the housing of a rotating electrical machine by means of anchor bolts 3'. Being made of a single piece, it is impossible to remove the pressure plate 1 'without having to previously disassemble the windings or stator windings that leave the magnetic core of the electric machine.
La presente invention permite, por el contrario, que las placas 1 de presion de las maquinas rotativas se puedan desmontar y cambiar sin necesidad de desmontar los devanados estatoricos 5, lo que simplifica notablemente las tareas de mantenimiento de las maquinas electricas y reduce el coste de las mismas.The present invention allows, on the contrary, that the pressure plates 1 of the rotary machines can be disassembled and changed without the need to disassemble the stator windings 5, which considerably simplifies the maintenance tasks of the electric machines and reduces the cost of the same.
La Figura 3 muestra una primera realization de una placa 1 de presion -de acuerdo con la presente invencion- que comprende, en este caso particular y sin caracter limitativo, ocho segmentos anulares 10 dispuestos de forma coplanar, formando una unica capa anular cerrada en la que, cada uno de los extremos laterales de cada segmento anular 10, esta en contacto con un extremo lateral de otro segmento anular 10 colindante.Figure 3 shows a first embodiment of a pressure plate 1 according to the present invention, which comprises, in this particular case and without limitation, eight annular segments 10 arranged in a coplanar manner, forming a single closed ring layer in the that, each of the lateral ends of each annular segment 10, is in contact with a lateral end of another adjacent annular segment 10.
Los segmentos anulares 10 estan provistos, en su borde interior, de dedos 2 de presion. Asimismo, cada uno de los segmentos anulares 10 esta provisto de dos agujeros pasantes 11.The annular segments 10 are provided, on their inner edge, with pressure fingers 2. Also, each of the annular segments 10 is provided with two through holes 11.
La placa 1 de presion tambien comprende, en este caso particular, una capa anular de cubierta externa formada por dos tramos anulares 12 cuyos bordes laterales forman entre si, en este caso particular, un angulo de 180°. Los tramos anulares 12 estan provistos, asimismo, de orificios pasantes que coinciden espacialmente con los agujeros pasantes 11 provistos en los segmentos anulares 10. Gracias a esta configuration, es posible introducir en cada uno de dichos orificios un perno 3 de anclaje, destinado a anclar cada tramo anular 12 y cada segmento anular 10 a la carcasa de la maquina electrica.The pressure plate 1 also comprises, in this particular case, an annular outer cover layer formed by two annular sections 12 whose side edges form, in this particular case, an angle of 180 °. The annular sections 12 are also provided with through holes that coincide spatially with the through holes 11 provided in the annular segments 10. Thanks to this configuration, it is possible to introduce in each of said holes an anchor bolt 3, intended to anchor each annular section 12 and each annular segment 10 to the housing of the electric machine.
Las figuras 4a y 4b muestran esquematicamente la forma en la que se disponen los segmentos angulares 10 de la placa anular de presion segun la presente invencion, con relation al nucleo magnetico 4 de la maquina electrica rotativa.Figures 4a and 4b show schematically the way in which the angular segments 10 of the annular pressure plate according to the present invention are arranged, relative to the magnetic core 4 of the rotating electric machine.
Los bordes laterales de los segmentos angulares 10 se han designado con la referencia 10a, el borde exterior con 10b y el borde interior con la referencia 10c. Asimismo, la referencia R designa el radio del nucleo magnetico 4.The side edges of the angular segments 10 are designated with the reference 10a, the outer edge with 10b and the inner edge with the reference 10c. Likewise, the reference R designates the radius of the magnetic core 4.
Como puede apreciarse en dichas figuras 4a y 4b, los dedos 2 de presion de los segmentos anulares 10 se disponen muy proximos a los dientes 9 del nucleo magnetico 4, aunque sin llegar a entrar en contacto con los mismos, existiendo una holgura definida por las siguientes magnitudes: B (diferencia existente entre la altura A de los dientes 9 y la altura de los dedos 2) y C (mitad de la diferencia existente en las anchuras de los dientes 9 y los dedos 2).As can be seen in said figures 4a and 4b, the pressure fingers 2 of the annular segments 10 are arranged very close to the teeth 9 of the magnetic core 4, although without coming into contact with them, there being a clearance defined by the following magnitudes: B (difference between the height A of the teeth 9 and the height of the fingers 2) and C (half of the difference in the widths of teeth 9 and fingers 2).
En la Figura 4a tambien se muestra, asimismo, el angulo 2aR formado por los bordes laterales de los dientes 2 del segmento anular 10 que estan mas proximos a los bordes laterales 10a de dicho segmento anular 10, el angulo de referencia aR y los ejes X (axial) e Y (radial).Figure 4a also shows the angle 2aR formed by the lateral edges of the teeth 2 of the annular segment 10 that are closest to the lateral edges 10a of said annular segment 10, the reference angle aR and the X axes (axial) and Y (radial).
La presente invencion no esta limitada, en modo alguno, a las realizaciones aqul divulgadas. Para la persona experta en la tecnica seran evidentes otras posibles realizaciones diferentes de esta invencion, a la vista de la presente description. En consecuencia, el alcance de protection de la presente invencion esta definido, exclusivamente, por las reivindicaciones que siguen a continuacion. The present invention is not limited, in any way, to the embodiments disclosed herein. Other possible different embodiments of this invention will be apparent to the person skilled in the art, in view of the present description. Accordingly, the scope of protection of the present invention is defined, exclusively, by the claims that follow.
Claims (8)
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| Application Number | Priority Date | Filing Date | Title |
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| ES201831225A ES2708398B2 (en) | 2018-12-17 | 2018-12-17 | RING PRESSURE PLATES FOR ROTARY ELECTRIC MACHINES |
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| Application Number | Priority Date | Filing Date | Title |
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| ES201831225A ES2708398B2 (en) | 2018-12-17 | 2018-12-17 | RING PRESSURE PLATES FOR ROTARY ELECTRIC MACHINES |
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| ES2708398B2 ES2708398B2 (en) | 2020-05-21 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2634379A (en) * | 1950-11-17 | 1953-04-07 | Keefe & Merritt Company O | Rotating rectifier for electric machines |
| US3238404A (en) * | 1961-02-15 | 1966-03-01 | Oerlikon Engineering Company | Clamping of stacks of core laminations for electrical machines |
| US5069587A (en) * | 1990-06-13 | 1991-12-03 | Dresser Industries, Inc. | Securing nut apparatus |
| US6346760B1 (en) * | 2000-12-14 | 2002-02-12 | General Electric Company | Axial bolt-in cage stator frame assembly and method for assembling a stator |
| US20110101819A1 (en) * | 2009-11-04 | 2011-05-05 | Ming-Hung Hsieh | Fixing enhancement mechanism for large iron core |
| EP2451047A1 (en) * | 2010-11-04 | 2012-05-09 | Siemens Aktiengesellschaft | Water cooled electric machine |
-
2018
- 2018-12-17 ES ES201831225A patent/ES2708398B2/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2634379A (en) * | 1950-11-17 | 1953-04-07 | Keefe & Merritt Company O | Rotating rectifier for electric machines |
| US3238404A (en) * | 1961-02-15 | 1966-03-01 | Oerlikon Engineering Company | Clamping of stacks of core laminations for electrical machines |
| US5069587A (en) * | 1990-06-13 | 1991-12-03 | Dresser Industries, Inc. | Securing nut apparatus |
| US6346760B1 (en) * | 2000-12-14 | 2002-02-12 | General Electric Company | Axial bolt-in cage stator frame assembly and method for assembling a stator |
| US20110101819A1 (en) * | 2009-11-04 | 2011-05-05 | Ming-Hung Hsieh | Fixing enhancement mechanism for large iron core |
| EP2451047A1 (en) * | 2010-11-04 | 2012-05-09 | Siemens Aktiengesellschaft | Water cooled electric machine |
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| ES2708398B2 (en) | 2020-05-21 |
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