Speed Control of Traveling-wave Ultrasonic Motors Using a Practical Modeling Approach

Chung, S.W.; Chau, K. T.

doi:10.1080/15325000601023670

Cited by 12 publications

(5 citation statements)

References 15 publications

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“…Speed fluctuation was also observed in steady state operation. 17,18 It is essential to build up a new dynamic contact model to explain the influence from the axial vibration on speed fluctuation.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear effect of tooth-slot transition on axial vibration, contact state and speed fluctuation in traveling wave ultrasonic motor

Zhang

Wang²

2017

Proceedings of the Institution of Mechanical Engineers, Part C:

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The tooth-slot transition creates an axial excitation on traveling wave ultrasonic motors. It induces a rotor’s axial rigid vibration, which in turn affects the contact state and arouses speed fluctuation. To gain an insight into this problem, this work examines the relationships between the tooth-slot transition, axial vibration, nonlinear contact, and speed fluctuation. An analytical model governing rotor’s vibration is developed, where the transition force, nonlinear contact stiffness, and pre-pressure are included. The contact stiffness is demonstrated to decrease with an increase in stator’s vibration amplitude and it is approximated by polynomial fitting such that the nonlinear problem can be analytically solved. The primary, 1/2 subharmonic, and 2/1 superharmonic resonances are analyzed to determine the amplitude–frequency response and steady-state response. Nonlinear phenomena regarding the three types of resonances are identified. The interaction between the transition force, axial vibration, contact stiffness and speed fluctuation is investigated through a new contact model. The results imply that the rotor vibration induces rotating acceleration and leads to speed fluctuation. In addition, the rotor speed fluctuates in a similar fashion with the axial vibration.

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Section: Introductionmentioning

confidence: 99%

Nonlinear effect of tooth-slot transition on axial vibration, contact state and speed fluctuation in traveling wave ultrasonic motor

Zhang

Wang²

2017

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…On the other hand, ultrasonic motor does not have a long history. In order to design a controller and increase the online control performance, the model of ultrasonic motor system for control application gets more and more attention [4][5][6][7][8][9][10][11]. Generally, for the purpose of online realization and minimizing the amount of online calculation, the control model should be relatively simple and can show the main aspects of nonlinear control of ultrasonic motor system [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…In order to design a controller and increase the online control performance, the model of ultrasonic motor system for control application gets more and more attention [4][5][6][7][8][9][10][11]. Generally, for the purpose of online realization and minimizing the amount of online calculation, the control model should be relatively simple and can show the main aspects of nonlinear control of ultrasonic motor system [6,7]. Control modeling usually adopts identification method based on the tested data, and the forms of model can be the transfer function [8], differential equation, neural network [9][10][11], and so forth.…”

Section: Introductionmentioning

confidence: 99%

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Steady‐State Fuzzy Modeling of Ultrasonic Motor System

Jingzhuo

2011

Modelling and Simulation in Engineering

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Because of the complicated energy conversion process, ultrasonic motor has remarkable nonlinearity. Therefore, it is difficult to achieve accurate speed control of ultrasonic motor. In general, a good model is the foundation of the accurate control effect. Because of the remarkable non-linearity of ultrasonic motor, the model should also be nonlinear. In this paper, the two-input and one-output steady-state model of ultrasonic motor system is worked out using fuzzy reasoning modeling method. Comparison between experimental data and calculated data of the model prove that the model can well simulate the nonlinear relationship among the amplitude of driving voltage, frequency, and rotating speed.

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“…Usually, for the purpose of online realization and minimizing the amount of online calculation, the control model should be relatively simple and show the main aspects of nonlinear control of ultrasonic motor system. Due to the limitations of theoretical modeling, control modeling usually adopts identification method based on the tested data [4][5][6][7][8][9][10][11]. According to the different identification methods, the forms of model can be the transfer function, differential equation, neural network, and so forth.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Takagi‐Sugeno Model for the Control of Ultrasonic Motor

Jingzhuo

2011

Journal of Control Science and Engineering

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Model of ultrasonic motor is the foundation of the design of ultrasonic motor's speed and position controller. A two-input and one-output dynamic Takagi-Sugeno model of ultrasonic motor driving system is worked out using fuzzy reasoning modeling method in this paper. Many fuzzy reasoning modeling methods are sensitive to the initial values and easy to fall into local minimum, and have a large amount of calculation. In order to overcome these defects, equalized universe method is used in this paper to get clusters centers and obtain fuzzy clustering membership functions, and then, the unknown parameters of the conclusions of fuzzy rules are identified using least-square method. Different experimental data that are tested with different operational conditions are used to examine the validity of the fuzzy model. Comparison between experimental data and calculated data of the model indicates that the model can well describe the nonlinear characteristics among the frequency, amplitude of driving voltage and rotating speed. The proposed fuzzy model can be used to analyze the performance of ultrasonic motor driving system, and also can be used to design the speed and position controller of ultrasonic motor.

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Speed Control of Traveling-wave Ultrasonic Motors Using a Practical Modeling Approach

Cited by 12 publications

References 15 publications

Nonlinear effect of tooth-slot transition on axial vibration, contact state and speed fluctuation in traveling wave ultrasonic motor

Nonlinear effect of tooth-slot transition on axial vibration, contact state and speed fluctuation in traveling wave ultrasonic motor

Steady‐State Fuzzy Modeling of Ultrasonic Motor System

Dynamic Takagi‐Sugeno Model for the Control of Ultrasonic Motor

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