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Resonant-type piezoelectric impact motors can improve the output capability effectively. A new construction of asymmetric inertial masses is proposed to synthesize approximate saw-tooth wave resonant vibration with matched anti-phase and in-phase modes. A prototype is designed, manufactured, and tested. With 40 Vp–p, 400 Hz exciting voltage for the anti-phase mode and 16 Vp–p, 800 Hz exciting voltage for the in-phase mode, the prototype provides a maximum no-load velocity of 17.2 mm/s and a maximum output power of 0.72 mW with 100 mN load. The velocity and output power of the prototype in the proposed resonant state are near three orders of magnitude higher than those in the traditional quasi-static state.

Piezoelectric impact motor (PIM) with high power driving capability has attracted extensive attention. This paper presents a new resonant-type PIM based on inertial drive mechanism. Architecture construction, dynamic modeling, and prototype experiment of the proposed motor are conducted. With sinusoidal driving voltages of 24 V p-p at 435 Hz and 18 V p-p at 870 Hz in the resonant mode, the prototype motor achieves an average no-load velocity of 26.1 mm s −1 , a stalling drag force of 350 mN, and a power output capacity of 2.55 mW, while it also provides a stable step displacement of 0.67 µm with saw-tooth wave driving voltage of 20 V p-p , 10 Hz in the stepping mode. Experiment results are consistent with the theoretical analysis, which confirms an effective approach to guide the structure design and further optimization for resonant-type PIMs.

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