Electric machine, core assembly, slot closure for core and method of manufacturing same

The embodiment of the invention provides a motor, an iron core assembly, a groove sealing piece of an iron core and a manufacturing method of the groove sealing piece. The iron core assembly comprises an iron core, a winding and a groove sealing piece of the iron core. The groove sealing piece of the iron core comprises a groove filling part and a connecting part, the groove filling part is arranged in the groove opening of the iron core, and the connecting part is connected with the groove filling part in each groove opening of the iron core to form an annular whole. According to the groove sealing piece of the iron core, the groove filling parts in the notches in the iron core are connected through the connecting parts, after the preset time, the preset pressure and the preset temperature, the pressed groove filling parts and the connecting parts are solidified, the connecting parts and the groove filling parts are tightly connected together, and an integrated annular groove sealing piece structure is forme