Abstract
A miniature non-resonance type linear piezoelectric motor based on a mechanical bridge-type amplification mechanism has been developed. The slender motor measures 29 mm × 5 mm × 3.5 mm. The stator consists of a parallel bridge amplifier and two multilayer piezoelectric actuators. The working principle of the motor is analyzed, and the physical performance of the bridge amplification mechanism is obtained by a finite element analysis. A prototype of the motor is manufactured, and the model is verified by experiment, and the mechanical properties of the motor characterized. The test results show that when the phase difference between the two driving signals is 90°, the output driving force of the motor reaches its maximum. The motor speed increases linearly from 2.2 mm/s to 7.6 mm/s when the driving frequency ranges from 100 Hz to 1100 Hz under the conditions of peak driving voltage 140 V, bias voltage 70 V and holding force 2.2 N. The motor speed decreases with the increase of load. When the driving frequency is 900 Hz and the holding force is 6 N, the maximum driving force can reach 1.41 N.
Highlights
Piezoelectric actuators have been developed by researchers due to their advantages of fast response, flexible design, high resolution and convenient control.1–3 In recent years, actuators based on the inverse piezoelectric effect have been widely used in precision positioning, nanotechnology, biomechanics and other fields.4–7Based on the resonant frequency of the motor stator, the linear piezoelectric actuator is divided into resonant type and non-resonant type
A pair of multilayer piezoelectric actuator (MPA) are fixed across the mechanism
When two MPAs vibrate in some way, driving foot can vibrate in an elliptical trajectory, driving the slider to move
Summary
Piezoelectric actuators have been developed by researchers due to their advantages of fast response, flexible design, high resolution and convenient control. In recent years, actuators based on the inverse piezoelectric effect have been widely used in precision positioning, nanotechnology, biomechanics and other fields.. The resonant mode is a state of instability, making the motor drive extremely sensitive to changes in the drive frequency. This results in a stringent requirement on the drive controller. Chen Xifu developed a linear piezoelectric stepper motor with a wide operating frequency.. Chen Xifu developed a linear piezoelectric stepper motor with a wide operating frequency.10 It shows that the friction-driven and non-resonant piezoelectric linear motors can operate stably over a wide range of low frequencies. A piezoelectric motor based on a mechanical amplification mechanism is demonstrated This motor has many advantages, such as slender shape, lower driving voltage, larger driving force and wide operating frequency. The structure, working mechanism and experimental result of a piezoelectric motor are reported
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