Dynamoelectrical generator

Abstract

A dynamoelectrical generator is cooled in its interior by a closed gas circuit, in particular an air circuit, which is connected via generator coolers arranged in the generator to an external cooling water circuit, in which a recooling device for cooling down the heated cooling water is arranged between the output and the input of the generator coolers. A refrigeration unit produces refrigeration and extracts further heat from the cooling water before it enters the generator coolers, and is disposed in the cooling circuit between the recooling device and the input to the generator coolers.

1 . A dynamoelectrical generator comprising: 
 a closed gas circuit configured to cool an interior of the generator;    an external cooling circuit including a coolant;    a plurality of generator coolers disposed in the interior of the generator and connecting the closed gas circuit to the external cooling circuit;    at least one refrigeration unit disposed in the cooling circuit upstream from an input to the plurality of generator coolers, the at least one refrigeration unit producing refrigeration and extracting further heat from the coolant prior to the coolant entering the plurality of generator coolers.    
   
   
       2 . The generator as recited in  claim 1 , wherein the closed gas circuit is an air circuit and the coolant is cooling water.  
   
   
       3 . The generator as recited in  claim 1 , wherein the refrigeration unit includes a refrigeration producer operable using electrical power.  
   
   
       4 . The generator as recited in  claim 3 , wherein the generator is part of a power station having a power supply system and wherein the electrical power for the refrigeration producer is taken from the power supply system.  
   
   
       5 . The generator as recited in  claim 1 , wherein the refrigeration unit includes a refrigeration producer operable using waste heat based on adsorption or absorption.  
   
   
       6 . The generator as recited in  claim 1 , further comprising a recooling device disposed in the cooling circuit and a bypass circuit configured to dissipate waste heat losses from the refrigeration unit, the bypass circuit being tapped off from the cooling circuit downstream from the recooling device.  
   
   
       7 . The generator as recited in  claim 6 , wherein the bypass circuit opens into the cooling circuit downstream from a coolant outlet of the plurality of generator coolers.  
   
   
       8 . The generator as recited in  claim 6 , further comprising a first heat exchanger disposed in the bypass circuit and configured to absorb the waste heat losses from the refrigeration unit, and wherein the bypass circuit is physically integrated with the first heat exchanger in the refrigeration unit.  
   
   
       9 . The generator as recited in  claim 1 , further comprising a controller connected to the refrigeration unit and configured to switch on the refrigeration unit only when a predetermined threshold value is exceeded.  
   
   
       10 . The generator as recited in  claim 9 , wherein a generator power is provided as a criterion for the threshold value.  
   
   
       11 . The generator as recited in  claim 9 , wherein one of a generator component temperature, an ambient temperature, and a coolant temperature is provided as a criterion for the threshold value.  
   
   
       12 . The generator as recited in  claim 1 , wherein the refrigeration unit and the cooling circuit interact in a manner that enables a flow of the coolant through the cooling circuit in the event of a failure of the refrigeration unit.  
   
   
       13 . The generator as recited in  claim 1 , wherein the refrigeration unit includes at least two redundant refrigeration producers.  
   
   
       14 . The generator as recited in  claim 1 , wherein the coolant includes an anti-freeze agent.  
   
   
       15 . The generator as recited in  claim 14 , wherein the anti-freeze agent includes glycol.  
   
   
       16 . The generator as recited in  claim 1 , wherein the closed gas circuit is a hydrogen circuit.  
   
   
       17 . The generator as recited in  claim 1 , wherein the cooling circuit includes a plurality of flow elements of the coolant, each flow element flowing through one of the plurality of generator coolers, and wherein the at least one refrigeration unit acts only on selected ones of the flow elements.  
   
   
       18 . The generator as recited in  claim 1 , wherein the cooling circuit is a closed cooling circuit.  
   
   
       19 . The generator as recited in  claim 1 , wherein the cooling circuit is an open cooling circuit.  
   
   
       20 . The generator as recited in  claim 1 , wherein the controller is configured to control the refrigeration unit as a function of an operating state of the generator.