Wei-qing Huang

A compact ultrasonic motor using two in plane modes

To meet the need of improving requirements for compact actuators in precision driving, a novel linear ultrasonic motor was proposed in this paper. The principle of this motor was introduced. With the help of commercial finite element analysis software ANSYS, finite element model of the stator of the ultrasonic motor was built and mode analysis was conduct to obtain an optimum design. A prototype was made and tested to verify simulation results. Testing results of the prototype shows that this motor can gain a maximum speed of 245mm/s and its thrust can reach 1.6N.

Design and finite element analysis of a novel longitudinal-torsional hybrid ultrasonic motor

This paper reported an ultrasonic motor using the 1st longitudinal and the 2nd torsional (L-T) modes. The stator slots were useful to tune the resonance frequencies and increased L-T displacements largely. By cutting slots, which determined the number of oscillators, the whole stator was changed into independent vibrators. The more independent vibrators, the bigger power it outputs. The stator possessing different number of vibrators can realize frequency tuning by increasing outer diameter. Piezoelectric elements were pasted on the outer surface of the metal substrate. L-T hybrid vibrations of the driving surface can be excited when suitable electrical signals were applied to piezoelectric units. The working principle of the designed motor was analyzed particularly. The optimal slots dimension and location, including vibration characteristics can be obtained using the finite element analysis software, ANSYS. The analyzed results and experiments verified the proposed motor possessing good performance.

Study on design and experimental of a piezoelectric linear motor using columnar actuator

With the rapid development of modern precision manufacturing industry, actuators with high resolution and long stroke are needed in many application fields. Because of the unique advantages such as self-locking on the power off, compact structure, fast response etc., piezoelectric actuators have been taking place of the traditional actuators which are based on the principle of electromagnetic induction. In this research, piezoelectric stacks were utilized as driving source to propose a piezoelectric linear motor. Design requirements of this motor were presented first and the structure of the motor was proposed. By modeling its stator, the operating principle of the motor was analyzed. In order to validate the feasibility of the principle, a prototype was made. The experimental results of the prototype show that the driving foot of the prototype vibrated with elliptical trajectory while two piezoelectric stacks are applied with two sinuous voltage signals with the same frequency. When proper preload is applied between the stator and rotor, the maximum no-load velocity of the motor is 7.3mm/s, and the maximum thrust force of the motor is 6.38 N.

Linear motor using stacked piezoelectric ceramics

To meet the need of advanced manufacturing technology, a piezoelectric actuator with high resolution was developed in this work. The principle of exciting the driving tip to vibrate elliptically was analyzed in detail. A prototype was fabricated to validate the analysis. Testing results shows that this prototype can obtain a speed of 16.6mm/sec in the sinuous exciting voltage signal with peak to peak value 100V, 50V offset and frequency 5.5 kHz. By adopting stacked piezoelectric ceramics, this motor has a stable output performance over a wide range of exciting sinuous voltage signal. Besides, this piezoelectric motor also has high resolution due to quasi-static operation mode.

Design of a new type of piezoelectric linear motor base on non-resonant vibration

Based on the piezoelectric ceramics stack had a big amplitude of displacement during low frequency, a new type of piezoelectric linear motor based on non-resonant vibration was proposed. The working principle of the motor was presented, the structure was designed by finite element software, and a prototype was made. The mechanical property of the motor was preferable during low frequency, its operating frequency was adjustable and working state was stable under the interference of external factors. The result of experiment shows that the motor could work in the frequency between 300Hz and 7KHz, the speed of the motor is proportional to the operating frequency. The maximum velocity is 5mm/s and the maximum thrust force of the motor is 4.8N.

Modeling and optimization design of double-feet piezoelectric linear motor based on the lever amplification mechanism

The design of lever amplification mechanism plays the crucial rule in the performance of double-feet piezoelectric linear motor which is based on the lever amplification principle. The kinematic principle of double-feet piezoelectric linear motor based on the lever amplification mechanism was analyzed and the dynamic model of the lever amplification mechanism based on the flexure hinge was established in the paper. And the theoretical amplification ratio was calculated, which are equal to 3.12 and 1.98 in the longitudinal and lateral direction respectively. Moreover, optimization design of structure parameter of flexure hinges in the lever amplification mechanism was carried out using Genetic Algorithm. The displacement of driving foot in the longitudinal and lateral direction is improved by 17.6 % and 8.1 %.

A two-dimensional image stabilization stage driven by piezoelectric actuators

Optical image stabilization system occupy an important place in infrared imaging products. Piezoelectric actuators have great advantages such as high-response and high-precision. A 2D stage using linear piezoelectric actuators is designed to achieve image stabilization. The piezoelectric linear actuator contains a shrinkage amplification mechanism and a stretching amplification mechanism, which can provide large stroke for the stage. Experimental results show the actuator has 67 μm displacements under the sine voltage of 120 V and the displacement is proportional to the voltage, the change of frequency has little effect on the displacement under the low frequency. It proves that the design scheme is feasible and provides a basis for integrated stabilization institution.

A novel 2D piezo-nanopositioning stage based on triangle amplifier mechanism

Due to their high resolution and positioning accuracy, piezo-nanoposititioning stages are widely used in precision and ultra-precision fields. A nano-positioning platform with large travel range and bidirectional symmetrical output characteristic is proposed. Theoretical static model develops the relationships among output force, displacement, static stiffness and the structure parameters of the platform. Static analysis of the platform is carried out by ANSYS workbench. Finally, the theoretical and the finite element models are confirmed by experiments. The experimental results of the prototype show that the output performances in X and Y direction are similar and both of them are within an 8% deviation from the theoretical value. The stroke of the stage reaches to 41.6μm and 42.9μm in X and Y directions respectively and is directly proportional to the amplitude of the input sinusoidal voltage of 10Hz. The minimum output displacement step is 50nm. The nano-positioning stage designed is featured with bidirectional symmetrical output characteristic and millisecond starting characteristic, with high positioning precision.

Clamp stepper piezoelectric linear motor with composite of two amplifications

This study presents a new type of linear motor based on the micro-vibration of piezoelectric stacks. The working mechanism of the motor was analyzed. Then the clamping structure and overall structure of motor was designed. Further, the best size of the flexible structures was obtained by means of finite element analysis method on the clamping structure. The prototype was manufactured and tested. Then the speed characteristic curve of motor is analyzed. The experimental results on the prototype verify the feasibility of the scheme, by applying voltage signal of peak to peak value 100V and frequency of 150 Hz, the no-load speed is 1.23 mm/s and the thrust is 1.6 N, and it meets the basic requirement of the precision of linear feed system.

An alternate stepping piezoelectric linear motor

An alternate stepping piezoelectric linear motor was proposed. The operation principle of this novel linear motor was analyzed. A prototype was fabricated and its mechanical properties was tested which proves that the principle is feasible. When the motor is driven by three-phase square and triangular waves and four-phase sine waves at a voltage of 100V(peak to peak value), and frequency of 100Hz, the speeds without load are 0.502mm/s and 0.432mm/s and the maximum outputs are 4.63N and 3.73N.The mechanical properties of the motor have been improved.