Resonant-Type Smooth Impact Drive Mechanism Actuator with Two Langevin Transducers

Abstract

A smooth impact drive mechanism (SIDM) is a unique piezoelectric actuator that is widely used as a camera focusing mechanism, cell phone lens movement mechanism, etc. This principle enables a compact driving mechanism; however, it cannot generate high-speed movement because a soft-type multilayered piezoelectric transducer (PZT) is utilized at off-resonant movement. This paper proposes a resonant-type SIDM actuator driven with hard-type PZTs to realize high-speed and powerful operation. The fundamental principle is also based on the conventional SIDM; therefore, a saw-shaped movement is required. To generate a high-power ultrasonic output, two Langevin transducers are adopted instead of a soft-type multilayered PZT. One Langevin transducer was a stator and the other was slider whose tip was adhered to a carbon fiber reinforced plastic (CFRP) rod. The CFRP rod was connected to the stator transducer with the frictional force. To obtain quasi-saw-shaped vibration, the longitudinal vibration for each Langevin transducer was excited and these movements were added at the connection point at the CFRP rod. In order to combine these vibration modes, the lengths of the stator and slider Langevin transducers were designed to make the resonant frequencies ratio to be 1:2. By using the proposed principle, the slider Langevin transducer was successfully driven with the speed of 0.11 m/s and the output force was 1.8 N with no load.

An Easily Fabricated Linear Piezoelectric Actuator Using Sandwich Longitudinal Vibrators With Four Driving Feet

“…The proposed actuator has advantages in output speed and thrust, compared with linear actuator proposed by Suzuki et al [34], which achieved the 3 N on the maximum thrust force and 112 mm/s on the maximum speed. Tenzer and Ben Mrad [56] have proposed an inchworm like actuator with four driving feet that has achieved a maximum thrust of 150 N and a speed of 20 mm/s.…”

Piezoelectric Inertia Motors—A Critical Review of History, Concepts, Design, Applications, and Perspectives

“…It has been measured using different methods: making the slider move against a spring, the force is either determined from the deformation of the spring [61,74,75], or using a load cell connected to the spring [76,77]. Other authors make the slider move directly against a load cell [67,[78][79][80][81], or the force is exerted to a part connected to a load cell instead of a slider [82]. (Bergander et al [67] (p. 33) and Kang et al [78] (p. 610) only state that they measured the force of the slider "with a precision balance" respectively "using a digital power gauge".…”

“…This issue has not been addressed to date in the literature reviewed in this work. Suzuki et al [80] present a motor where one of the two superposed sinusoidal vibrations is generated not by the stator, but by the actively excited slider. By proper utilisation of eigenmodes, it is also possible to realise special characteristics like a piezoelectric actuator positioned parallel to the driving rod or an out-of-phase driving of two rods using only one piezoelectric actuator, as shown by Vasiljev [267].…”

Fracture behaviours of brittle ceramics under elliptical ultrasonic vibration: near-to-limit contact analysis of an elastic flat punch

“…As aforementioned, numerical simulation by FEM provides a feasible and convenient way for the analysis of contact problems under extreme conditions. Considering the vibration characteristics of the V-shaped vibrator, the quasi-static contact decoupling analysis is conducted using elastic contact theory and FEM to provide a reference for the contact analysis of piezoelectric devices (Suzuki et al 2012;Zhang et al 2020). During the operation of SWUMs, the contact states of stator and slider vary with time for the worn loss and fracture under the combined actions of sliding friction and ultrasonic impact.…”