关键词: 同心式永磁齿轮, 启动特性, 启动位置, 交变周期

Abstract: The starting characteristics model of CPMGs were put forward based on rotor dynamics. Influences of gearing ratio， starting position and output speed of driven rotor on the starting characteristics of CPMGs were analyzed. By the transient finite element method， three CPMGs were established with same structural parameters and different gearing ratios， the starting characteristics were analyzed in different gearing ratios. When the gearing ratio containing as 0.75， starting characteristics are the best. Based on the theorem of moment of momentum， the influences of the starting positions with the driven rotor on the starting characteristics were given， and the optimum starting position was obtained when the output torque was equal to the load torque. By calculating alternating periods of output torques， the relationship between the output speeds and alternating periods was obtain， when the driven rotor output speed is larger， the alternating period of output torques is larger， the CPMGs are easy to start.

Key words: concentric permanent magnetic gear（CPMG）； starting characteristic；starting position； , alternating period