The solid rotor starts the double-stator double-rotor motor running on the squirrel-cage rotor, including the stator, rotor, end cover, transmission shaft, and bearing system. Its main technical feature is that there are two rotors, namely the squirrel-cage rotor and the solid rotor. Coaxially installed on the same transmission shaft, there are two stators, namely the main stator and the removable stator. The main stator and the squirrel-cage rotor correspond to form an independently running squirrel-cage rotor asynchronous motor, and the removable stator corresponds to the solid rotor. It constitutes a solid rotor asynchronous motor that operates independently, and a fan is installed on the transmission shaft. The present invention cleverly combines solid rotor and squirrel-cage rotor motors, which have different starting and running characteristics, into a coaxial double-stator double-rotor motor, which gives full play to their advantages respectively, and proposes and uses uninterrupted power switching technology, which truly solves the problem of The problem of "starting", "running" and "reliability" that has plagued the motor industry for a long time can not be achieved at the same time. The implementation method is simple and easy to promote.