||This paper proposes a design process based on the aspects of structure, configuration, and function. A mechatronic integrated design combining a switched reluctance motor with a planetary gear train (PGT) reducer is developed systematically. First, feasible design concepts are generated from the identified design requirements and constraints by considering existing SRMs and PGT reducers. The integration elements are selected to fit the design requirements. Then, detailed design and analysis are performed regarding the performance of the PGTS as well as the electromagnetic characteristics and output performance of the motor. In addition, the Taguchi method is employed to identify the optimal electrical parameters and geometric configuration of the motor. Finally, the output characteristics of the integrated device and existing design are compared. The integrated design has a 12.94% higher average torque, 40.74% lower torque ripple, and 9.10% smaller axial space.