There are proposed a manufacturing method of a winding assembly of a rotating electrical machine using a rotation block and a fixed block and a manufacturing apparatus used for the same. In order to preheat the condensate, said condensate is split into a first partial current and a second partial current. The information is used to make a decision about the transmission of the frames, such as the order for sending the frames or whether or not to send a frame. Thus, the reliability of the apparatus is increased, and the quality of casting is improved.