Patent ID: 6624542
Filing Date: 2003-09-23
Classification: F16C,H02K,Y02E

Abstract:
A flywheel power source, comprising:a flywheel supported by a bearing system for rotation inside an evacuated container; a brushless motor and generator for accelerating and decelerating said flywheel for storing and retrieving energy, said generator having a rotor and a stator; said rotor being coupled to said flywheel, and said stator being made of stationary coils that are wound with multiple-strand individually insulated conductor wire; a heat energy transfer system for passively cooling said stator by heat transfer from including a stator coolant vessel partially filled with said coolant, and said coolant circulates in said coolant vessel solely by natural convection; whereby said liquid coolant limits the maximum temperature of said coils reached during discharging of said flywheel power source.