Abstract:
The object of the invention is a synchronous machine, which is controllable by means of a frequency converter connected to it. The synchronous machine comprises a stator winding, which comprises between the synchronous machine's two terminals at least a first sub-coil (U pl ,V pl ,W pl ) and a second sub-coil (U p2 ,V p2 ,W p2 ), onto which a voltage essentially of the same amplitude is induced when the synchronous machine is rotating. Furthermore, the synchronous machine comprises a switching device, by means of which the first sub-coil (U pl , V pl , W pl ) and the second sub-coil (U p2 ,V p2 ,W p2 ) are connectible in series with each other when the switching device (K 1 ;K 2 ,K 3 ) is in the rest position in such a way that their voltages are opposite and that the voltage in the terminals (L 1 ,L 2 ,L 3 ) of the synchronous machine is essentially zero when the synchronous machine is disconnected from the frequency converter controlling it.
Abstract:
Una disposición para enfriar una máquina eléctrica, cuya máquina eléctrica (1) comprende un rotor externo (2)que gira alrededor de su eje de rotación y un estator (5) situado radialmente dentro del rotor en el extremo de unentrehierro (3) y que comprende unos paquetes (4) de hojas en forma de anillo, en donde una primera parte de unflujo (6a) de refrigerante es conducida des de ambos extremos axiales del estator (5) por medio de unos canales(7a-b) de enfriamiento axial a los paquetes de hojas (4) del estator , y en donde una segunda parte (6b) del flujo derefrigerante es conducida desde ambos extremos axiales del estator (5) al entrehierro (3) y desde el entrehierro (3)además al paquete (4) de hojas de estator por medio de como mínimo un canal (8) de enfriamiento radial,caracterizado porque ambas partes (6 a-b) del flujo del refrigerante son conducidas además desde los paquetes(4) de hojas hasta el como mínimo un intercambiador de calor (9) situado radialmente dentro de los paquetes (4) dehojas del estator, dicho intercambiador de calor tiene una superficie (10) de intercambio de calor que forma un canalcerrado para un flujo de refrigerante externo, a cuyas partes primera (6a) y segunda (6b) de flujo de refrigerantese les permite circular libremente en el otro lado de la superficie (10) de intercambio de calor y porque como mínimoun ventilador (11) está situado dentro del intercambiador de calor (9) con el fin de repetir el ciclo de refrigeración yenviar la primera parte (6a) y la segunda parte (6b) de flujo de refrigerante a dichos extremos axiales del estator(5).
Abstract:
In an electrical machine cooling element according to the invention, the electrical machine (25) comprises a rotor and a stator (26). In the electrical machine (25), the outer surface (14) of the stator is divided into sections (22a-b) equal to the length (L) of the stator. The cooling element (1) comprises a minimum of two modules (2), each module (2) comprising adjacent pipes (3a-c) substantially parallel to the stator's longitudinal axis, the ends of the pipes being joined using connecting parts (4a-b). The cooling agent flows in opposing directions (F d ) in the adjacent pipes, and the width of the module (2) is equal to the width (Wu) of the outer surface section (22a-b) at most.
Abstract:
The object of the invention is an arrangement in a synchronous machine, which synchronous machine contains n-phased winding (U,V,W) and has constantly operating magnetisation means. According to the invention, switching means have been fitted in a synchronous machine, by means of which the synchronous machine can be connected to the input source and disconnected from the input source, together with switching devices (K1,K2,K3) by means of which the phase winding (U,V,W) can be isolated from other phase windings and/or the input source and connected to other phase windings (U,V,W) and/or input source.
Abstract:
In an electrical machine cooling element according to the invention, the electrical machine (25) comprises a rotor and a stator (26). In the electrical machine (25), the outer surface (14) of the stator is divided into sections (22a-b) equal to the length (L) of the stator. The cooling element (1) comprises a minimum of two modules (2), each module (2) comprising adjacent pipes (3a-c) substantially parallel to the stator's longitudinal axis, the ends of the pipes being joined using connecting parts (4a-b). The cooling agent flows in opposing directions (F d ) in the adjacent pipes, and the width of the module (2) is equal to the width (Wu) of the outer surface section (22a-b) at most.