Resonant-type Smooth Impact Drive Mechanism (SIDM) actuator using a bolt-clamped Langevin transducer

The Smooth Impact Drive Mechanism (SIDM) is a linear piezoelectric actuator that has seen practically applied to camera lens modules. Although previous SIDM actuators are easily miniaturized and enable accurate positioning, these actuators cannot actuate at high speed and cannot provide powerful driving because they are driven at an off-resonant frequency using a soft-type PZT. In the present study, we propose a resonant-type SIDM using a bolt-clamped Langevin transducer (BLT) with a hard-type PZT. The resonant-type SIDM overcomes the above-mentioned problems and high-power operation becomes possible with a very simple structure. As a result, we confirmed the operation of resonant-type SIDM by designing a bolt-clamped Langevin transducer. The properties of no-load maximum speed was 0.28 m/s at driving voltages of 80 Vp-p for 44.9 kHz and 48 Vp-p for 22.45 kHz with a pre-load of 3.1 N

► The resonant type Smooth Impact Drive Mechanism is proposed. ► This driving principle enables simpler stator transducer and powerful operation. ► Bolted Langevin transducer was designed to have appropriate resonant frequencies. ► By combining two longitudinal vibration modes, quasi-saw shaped vibration could be excited. ► The no-load maximum speed was 0.3 m/s.