Rotary transformer

The rotary transformer comprises a rotor, a stator, an insulating framework, an upper protective cover, a lower protective cover, a coil and PINs, the rotor and the stator are respectively made of metal materials, and the insulating framework, the upper protective cover and the lower protective cover are respectively made of insulating materials. The stator and the PINs are respectively and integrally connected to the insulating framework, a plurality of wire protection units are arranged at the inner ring of the insulating framework, the coil is wound on the plurality of wire protection units, and the head end and the tail end of the coil are respectively connected with the PINs. The upper protective cover and the lower protective cover are mutually buckled and connected to the insulating framework, so that the upper protective cover is fixedly arranged at the upper end of the insulating framework, and the lower protective cover is fixedly arranged at the lower end of the insulating framework. According to t