Abstract
For expanding the driving mode of the piezoelectric motor, a novel piezoelectric motor modulated by a magnetic field is proposed. This driving system combines piezoelectric driving and magnetic modulation together and can transform the reciprocating swing of the stator into step running of the rotor via the intermittent magnetic clamping between the rotor and stator. For investigating the inherent character of dynamics, the dynamic equations of key parts of the driving system are established. The natural frequencies and mode functions of the driving system are solved. A prototype was fabricated to prove the dynamic analysis and measure the output characteristic. The results show that the nature of the frequency measured from the test is coincident with theoretical analysis. In addition, by applying the driving frequency of 3 Hz, the voltage of the modulating signal of 4.5 V, the phase difference α between driving signal and modulating signal of 30°, the ideal outputs are 0.1046 rad/min for velocity and 0.405 Nmm for torque.
Highlights
IntroductionWith the continuous development of modern technology, the requirements for driving devices in intelligent manufacturing, optical fiber docking, biomedicine, and focusing systems are increasing
With the continuous development of modern technology, the requirements for driving devices in intelligent manufacturing, optical fiber docking, biomedicine, and focusing systems are increasing.Piezoelectric motors are widely used in these fields because of their high displacement resolution, simple structure, and fast response [1,2]
In the 3rd order modal function curve, the piezoelectric stack appears a peak near 0.008 m, the beam AB appears a trough near 0.023 m and two peaks near 0.012 m and
Summary
With the continuous development of modern technology, the requirements for driving devices in intelligent manufacturing, optical fiber docking, biomedicine, and focusing systems are increasing. The maximum speed of the motor can reach 146 r/min and the maximum torque is 1 Nm. Izuhara S. et al [8], proposed a piezoelectric ultrasonic linear motor with hollow rectangular stator. Andrius C. et al [12], designed a new type of inertial piezoelectric motor, consisting of a rectangular bronze stator, a clamping frame, a piezoelectric plate, and a conical rotor. Wang L. et al [13], proposed a new type of piezoelectric inertial rotary motor, which can be used to drive underwater micro-robots. The motor is composed of two rotors and a disc stator It has a simple structure, small size, and good waterproof performance. Introducing electromagnetic force into the piezoelectric motor improves the controllability of the clamping force or preload and the friction and wear between the stator and rotor are effectively reduced. We conduct an experiment to measure the output characteristic of a prototype
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