During the working process of mechanical equipment, there is always a location where the motor and other components have the largest vibration. Placing a sensor at this location can facilitate the acquisition of vibration signals, reduce time costs, and increase economic benefits. Therefore, this paper proposes a piezoelectric inertial motor that can be used for precision localization for fault diagnosis. The introduction of the spring component to generate the stiffness asymmetric motion. The dynamics model of the inertial motor is established to verify the feasibility of the designed motor. The proposed motor can provide new ideas for the design of future piezoelectric inertial motors and new ideas in the field of fault diagnosis.