In recent years, reducing the number of cylinders of an engine has been advanced for fuel saving. However, as the cylinder number is reduced, the torque fluctuation from the engine increases and the NV performance deteriorates. Therefore, the importance of torsional vibration reduction technology has been rapidly increased, and active research and development is under way. Among them, CPVA is attracted to attention because it effects in the full revolution range. This study focuses on the torque generated by CPVA as the vibration reduction performance of CPVA and a theoretical expression for calculating the generated torque is derived. Pendulum trajectory covers circular path and epicycloid path. Next, in order to verify the effectiveness of the theoretical analysis result, a multibody dynamics model corresponding to the theoretical analysis model is developed and the results of both are compared. Further theoretical analysis will clarify the influence of excitation order, excitation amplitude, pendulum damping coefficient and pendulum path for CPVA generated torque.