Оценка конструктивного совершенства систем принудительного охлаждения синхронных электромагнитных машин ударного действия

Abstract

Impact synchronous electromagnetic machines forced cooling systems constructions have been classified and estimated. The first group of electromagnetic machines cooling systems include impact node external ventilation ones where heat is dissipated only from the magnetic core external cylinder surface. The second group involves cooling systems with internal airflow paths having independent air inlet and outlet through holes in poles. The third group includes cooling systems with coaxial channels in windings. If multilayer winding separate sections have the same thickness, their balancing cooling is provided by airflow rate in particular ventilation channels in proportion to dissipated power. Hence temperature difference between heated layers in the winding space can be two times and more reduced. The fourth group includes cooling systems with channels radial configuration to increase windings total cooling surface area, reduce airflow resistance and provide more balanced heating of both windings. External forced airflow cooling systems are specified with heat flow range related to winding cooling surface area and specific winding active volume thermal load. Forced air cooling is proved to permit additional electromagnetic impact load, increasing impact energy or frequency at permissible heating. Ventilation unit power to support electromagnetic impact machine duty cycle about 100% can be 25% of power consumed by the impact node.