Wireless Torque Transfer using Rotating Magnetic Field with Multiple Coils

Various methods of wireless torque transfer have been introduced to the fields of applications and highly utilized. In this paper, a method of wirelessly transmitting torque to a magnetic material by generating a rotating magnetic field using multi-coils is proposed. The rotating magnetic field generated by the current flowing in the proposed coil arrangement can be proved by using Biot-Savart law. Therefore, when a magnetic material is placed between the proposed coils, torque is generated due to the rotating magnetic field. Furthermore, since the torque by the magnetic field is closely related to the current applied to the coils, so that the torque can be changed through current. The proposed method was verified through theoretical analysis and simulation.