Abstract: Wireless power transmission technology can effectively solve the problems of wear，leakage and so

on in the energy transmission process of traditional plug-in electrical equipment because of its non-physical contact

energy transmission mode. In view of this，a new type of secondary side magnetic ring strip type loosely coupled

transformer（LCT）was proposed，which can effectively reduce the weight of the robot，and then enhance its mobility and navigating ability. In order to obtain the optimal performance of LCT，firstly，the efficiency product was introduced to measure the comprehensive efficiency of the system as an index. Secondly，through the electromagnetic simulation software，the structure of the new magnetic ring strip core was compared and analyzed，the simulation results show that the magnetic core structure has good magnetic gathering performance，which can effectively improve the LCT coupling coefficient. Finally，an experimental platform based on the proposed new LCT structure was built to verify the validity of the theoretical analysis. It has certain engineering application value.

      Key words: robots；strip core；wireless charging technology；magnetic coupling mechanism