Study On Electromagnetic Modulation Rotating Micro Piezoelectric Motor

A non-contact piezoelectric motor is a piezoelectric motor in which the stator and the rotor are not in direct contact.At present,there are two forms to achieve the non-contact: one is the use of electrorheological technology,the other is the use of pneumatic suspension.Electrorheological technology and pneumatic suspension technology-related equipment is more complex,the control of the motor control system requires a higher accuracy,making the motor work poor stability.In this paper,we present a new type of non-contact piezoelectric motor,which is based on the principle of electromagnetic modulation to achieve the non-contact work of the rotor.The structure is simple,the control system is not susceptible to external environmental characteristics,Which can greatly improve the stability of motor.The motor uses the inverse piezoelectric effect of the piezoelectric stack to move the piezoelectric stack back and forth through a transmission coupling mechanism into a rotor.By analyzing the working principle of the motor,the free vibration dynamic model of the drive system is established.The coupling free vibration modal function of the system is obtained,and the coupling natural frequency of the drive system is obtained,and the free vibration modal function image of each key component is given.By changing the system parameters,the influence of the parameter change on the system free vibration is obtained.The results show that the length of the driving beam has the most significant influence on the free vibration modes of the drive system.By studying electromagnetics theory,we provide the accurate calculation formula of electromagnetic force under the condition of magnetic flux leakage and iron loss is deduced.The formula is simplified reasonably from the engineering point of view.Taking the structural parameters of the electromagnetic coupling system as dependent variables,the exact relation between the electromagnetic force calculation formula and the simplified engineering formula is given,and the theoretical support for calculating the forced vibration of the driving system is also provided.The results show that the simplified formula of this project satisfies the requirement of electromagnetic force calculation within the range of specific parameters.Considering the coupling excitation of electromagnetic force and piezoelectric stack,the dynamic model of forced vibration of the driving system is established,and the response function of the system is obtained.The response curve of the forced vibration of the system is given.By changing the relevant parameters that affect the response of the forced vibration,the influence of the parameter change on the forced vibration of the system is obtained.The results show that the modal force of the piezoelectric stack has a great influence on the forced vibration response of the driving beam and has little effect on the forced vibration response of the spindle.By studing the motor control requirements,the control system is circuit designed.Analysis of the circuit construction principle,the use of the development board designed in line with the motor work of the drive control signal.An experimental prototype has been developed and a prototype test platform has been built.The correctness of the vibration theory is verified by the experiment of motion verification of the prototype.