Classification of induction generators used in manufacturing plants and facilities. These generators produce induced electromotive force through rotating magnetic fields and are integrated into wind power generation equipment, hydroelectric power generation equipment, and cogeneration systems. Types include squirrel cage induction generators, wound rotor induction generators, and doubly-fed induction generators, utilized as in-house power generation equipment and renewable energy systems in manufacturing plants. Unlike synchronous generators, they feature a structure that generates power using slip without permanent magnets or excitation windings in the rotor. For industrial applications, they support a wide range of capacities from several kW to several MW class, serving as generators with excellent maintainability and economic efficiency that play important roles in manufacturing sites.