Classification of rotating machinery responsible for power supply and power transmission in manufacturing industries. Includes generators used as emergency or regular power sources (diesel generators, gas generators, wind turbines, etc.), various motors serving as power sources for factory equipment (induction motors, synchronous motors, servo motors, etc.), motor-generators for power conversion, and special-purpose rotating machinery. Essential equipment for stable operation of production lines, backup power during outages, and energy conservation. Distinguished from simple electrical components and control devices, specialized in mechanical equipment that generates power or transmits power through rotational motion.