ELECTRICAL MACHINE AND ELECTRIC GENERATOR (ALTERNATIVES) Russian patent published in 2005 - IPC

FIELD: electrical engineering; electrical machines including electrical generators.

SUBSTANCE: electrical machine has part of magnetic circuit representing part of electrical machine rotor or stator. This part of magnetic circuit loses its magnetic properties at temperature higher than definite preset value and conveys magnetic flux around electrical machine stator. As a result, any magnetic flux escaping the rotor does not enclose the stator any longer when temperature rises above mentioned value, and machine stops running as generator. This part of magnetic circuit is in thermal contact with windings carrying stator current of electrical machines. Material of above-mentioned part of magnetic circuit has Curie temperature lower than thermal breakdown point of machine which, in its turn, limits operating temperature of stator windings thereby preventing in-service temperature rise of machine usually occurring as a result of trouble due to heavy currents flowing in electrical machine and liberation of great amount of heat, especially from stator windings, that may cause melting and even inflammation of electrical machine. Proposed electric generator is available of two design alternates.

EFFECT: enhanced reliability of electrical machine protection against excessive temperature rise.

16 cl, 8 dwg