Research On A Double-stator Bar-type Bending Ultrasonic Motor

Ultrasonic motor(USM)is a new principle motor developed in the 1980s.It is different from traditional motors in principle,using the converse piezoelectric effect of piezoelectric materials converts electrical energy on the piezoelectric oscillator(stator)into micro vibration in the ultrasonic frequency domain,then convert oscillator micro vibration to rotor macro linear(rotating)motion by the friction effect between stator and rotor,thus outputting the power and driving the load.As a new type actuator of Ultrasonic motor,it has the advantages of simple structure,fast response,low noise,low speed,large torque,easy to control,no electromagnetic interference and self-locking when power is off.Based on the unique advantages of the ultrasonic motor,which make ultrasonic motor have wide promising in the field of micro machinery,automobile industry,intelligent robot,precision instruments,aerospace etc.To meet the demand of application in many fields,all kinds of structure forms of ultrasonic motor arises at the historic moment,the miniaturization and large torque become the research focus.On the base of searching and reading mass of reference,in this paper,the double-stator bar-type bending ultrasonic motor as the research object are studied from the aspects of the operation mechanism,design theory and electrical matching,manufactured the motor prototype.The main contents are as follows:(1)This paper systematically summarized the research significance and the development history of ultrasonic motor.And it also introduced the classification,characteristics,research status and application situation at home and abroad of bar-type bending ultrasonic motor.Then,the research contents of this paper was determined.(2)The basic theories related to bar-type bending ultrasonic motor are presented,mainly including the properties of piezoelectric ceramic and beam bending vibration theory,and established the mathematical model.The project studied the operation mechanism of this type USM,thus deduced the particle elliptic motion of stator surface and has carried on the simulation with MATLAB,and studied the contact model between stator and rotor.(3)The structure of double-stator bar-type bending ultrasonic motor was designed,structure characteristics of the langevin stator were described and cone surface drive scheme was put forward in this paper.(4)The finite element model of the motor stator and rotor was established and dynamics analysis is carried out by finite element software ANSYS,mainly including sensitivity analysis,mode analysis and harmonic response analysis.(5)Electrical matching of the ultrasonic motor was studied and drive system design scheme was put forward in this paper,finished the processing and assembly of motor prototype.