<p>A novel maglev deceleration drive system (MDDS) with the advantages of compact structure and high torque is proposed in this paper. The structure and working principle of the MDDS are introduced. Based on the equivalent magnetic circuit method, the time-varying air-gap magnetic density between the stator teeth and floating ring are obtained. According to the virtual work principle, the maglev forces generated by magnetic pole pairs are derived. The resultant maglev forces acting on the floating ring are deduced by the force model of the floating ring. With finite-element simulation, the validity of analytical model for the air-gap magnetic density is verified. In addition, the superiority of the permanent magnet position in the maglev drive part is demonstrated. Furthermore, the influences of the structure parameters on the resultant maglev forces are analyzed. Results show that the eccentric distance of the floating ring and stator axial length have a great influence on the resultant maglev forces. This research is of great significance to further output torque research and structure optimization of MDDS.</p>