Open-type induction motor

An open-type induction motor comprising:

• a stator including an iron stator core having a radial duct hole and a stator coil wound around the iron stator core;
• and
• a rotor disposed in a hollow of the stator so as to be rotatable by magnetism generated by the stator coil, and including a rotational shaft, a plurality of iron rotor cores stacked in an axial direction of the rotational shaft and coupled to the rotational shaft, a rotor coil coupled to the plurality of iron rotor cores, and duct plates stacked between the plurality of iron rotor cores and outwardly discharging air present at the inner side of the iron rotor cores,
• wherein each of the iron rotor cores comprises a plurality of air holes allowing air to flow therethrough in an axial direction of the rotational shaft,
• wherein each of the duct plates includes a plurality of radially formed blade portions and a plurality of duct slit portions formed between the plurality of blade portions,
• wherein the duct slit portions communicate with the air holes of the iron rotor cores, and extend and cut outwardly of the iron rotor cores, and
• wherein the plurality of duct slit portions correspond one-to-one to the plurality of air holes, and are formed radially, outwardly from an inner side of the duct plates.