Generator motor device

Abstract

A motor/generator system is provided in which a casing ( 111 ) of a motor/generator (MG) is connected to a casing ( 15 ) of a displacement type expander of a Rankine cycle system, and a rotor ( 117 ) of the motor/generator (MG) is supported on a shaft end of an output shaft ( 32 ) extending from the expander to the interior of the motor/generator casing ( 111 ). Providing communication between an internal space of the expander casing ( 15 ), where steam that has leaked from an expansion chamber of the expander is present, and an internal space of the motor/generator casing ( 111 ) via a through hole ( 15 a ) enables the motor/generator (MG), which reaches a high temperature due to generation of heat in a coil ( 124 ), to be cooled by leaked steam that has entered via the through hole ( 15 a ), and covering the low temperature expander casing ( 15 ) with the high temperature motor/generator casing ( 111 ) enables the escape of heat from the expander casing ( 15 ) to be minimized, thereby enhancing the efficiency of the expander. It is thus possible to cool effectively the motor/generator connected to the displacement type expander and at the same time minimize the escape of heat from the expander, thereby enhancing the efficiency.

1 . A motor/generator system in which a motor/generator (MG) is connected to an output shaft ( 32 ) of a displacement type expander (E) that converts adiabatic expansion of high temperature, high pressure steam into mechanical work, 
 characterized in that an expander casing ( 11 ) housing the expander (E), which is lubricated with oil, and a motor/generator casing ( 111 ) housing the motor/generator (MG) are joined so as to be hermetically sealed to the outside air, and an internal space of the expander casing ( 11 ), where steam that has leaked from an expansion chamber ( 43 ) is present, is made to communicate with an internal space of the motor/generator casing ( 111 ) via a through hole ( 15   a ).    
   
   
       2 . The motor/generator system according to  claim 1 , wherein the through hole ( 15   a ) provides communication between upper parts of the internal spaces of the expander casing ( 11 ) and the motor/generator casing ( 111 ).  
   
   
       3 . The motor/generator system according to  claim 1 , wherein a liquid return passage ( 132 ) is provided in lower parts of the expander casing ( 11 ) and the motor/generator casing ( 111 ), the liquid return passage ( 132 ) returning water and oil that have accumulated within the motor/generator casing ( 111 ) to the expander casing ( 11 ).  
   
   
       4 . The motor/generator system according to  claim 1 , wherein the motor/generator casing ( 111 ) is detachably joined to the expander casing ( 11 ) so as to cover an output shaft support ( 15 ,  102 ,  104 ) provided on the expander casing ( 11 ).  
   
   
       5 . The motor/generator system according to  claim 1 , wherein the motor/generator (MG) comprises a rotor ( 117 ) fixed to a shaft end of the output shaft ( 32 ), and a bearing ( 105 ) for cantilever support of the shaft end of the output shaft ( 32 ) on the expander casing ( 11 ) is housed in a depression ( 120   a ) of the rotor ( 117 ) formed by supporting a permanent magnet ( 121 ) on an outer peripheral face of the rotor ( 117 ).