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 (15a) 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 (15a), 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.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a motor / generator system in which a motor / generator is connected to an output shaft of a displacement type expander that converts adiabatic expansion of high temperature, high pressure steam into mechanical work. BACKGROUND ART [0002] Japanese Patent Application Laid-open No. 5-98902 discloses an arrangement in which a casing of a displacement type expander of a Rankine cycle system is integrated with a casing of a motor driven by an output shaft of the expander so as to have a structure that is hermetically sealed to the atmosphere, thus preventing leakage of ammonia or Freon, which are working media, from the casing of the expander or the casing of the generator to the atmosphere. The motor is of a so-called can type, the outer periphery of a rotor being covered by a can forming a part of the casing of the motor so as to isolate the rotor from a stator, thus preventing the working medium from leaking past the stator, p...

AI Technical Summary

Benefits of technology

[0007] The present invention has been achieved under the above-mentioned circumstances, and it is an object thereof to cool effectively a

Problems solved by technology

The arrangement disclosed in Japanese Patent Application Laid-open No. 5-98902 carries out cooling by employing a can type generator and putting the stator coil in direct contact with the atmosphere, but it is difficult for this alone to achieve a sufficient cooling eff

Images