Abstract: A cone-rotor magnetic coupler, CRMC, is designed in this paper. The CRMC is simplified as a radial and axial combination model, and the expressions of air gap flux density and electromagnetic torque of each model are obtained by equivalent magnetic circuit method. The relationship between electromagnetic torque and slip ratio is calculated and verified, which provided conditions for analyzing the operation characteristics of CRMC. The function curves of output speed, torque and power with the axial coupling length of CRMC has been obtained by the finite element model simulation, it is verified that CRMC has good energy-saving effect and high speed regulation efficiency when applied to centrifugal load.