Inductive coupled power transfer ( ICPT) technology provides a safe and efficient solution for power supplying of rotating structures. For the disadvantages of design installation and debugging in traditional coaxial and side-mounted structure, this paper presents a planar array coil inductive coupled power transfer structure. It analyzes the stability and offset resistance of the power supply in the mobile system by building the 3D FEM model. The experimental results show that the coupling structure eliminates the disadvantages of the position of the transmitting and receiving coils being relatively static when the traditional structure is powered. It has good robustness and portability to the moving object. It is easy to install and use, and better adapts to the power supply of mobile devices. When this structure is powered, the speed of the rotating shaft can be acquired at the same time by the small fluctuation of the induced voltage amplitude in receiving coil.