Control of an ultrasonic transducer to realize low speed driven

Zhangfan,; Chen, Weishan; Liu, Junkao; Xue-tao, Zhao

doi:10.1016/j.ultras.2006.05.054

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…Compared to [16], we developed a different method to achieve a lower speed precision controlling and realized a good results: in this study, the driving voltage of the motor was selected as the control variable and the fuzzy PID control was used to adjust it in real time to achieve low speed control. The minimum speed of the motor achieves 10 μm/s, the maximum speed error and the coefficient of variation cv in stable state are respectively 24.5% and 16.3%, the maximum speed tracking error of the triangle wave signal and sinusoidal wave signal is respectively 0.1 mm/s and 0.15 mm/s.…”

Section: Discussionmentioning

confidence: 99%

“…A minimum stepped angle of was obtained by using this method. Zhang et al developed a PWM control method to realize the low speed controlling of a linear ultrasonic motor by adjusting the difference of the two vibrators' vibrating amplitudes [16]. This method is different from the general method of decreasing vibrating amplitude of ultrasonic motor to realize low speed, two transducers of the linear ultrasonic motor are respectively excited by pulses whose width can be modulated to realize two contrary elliptical vibrations with different vibrating amplitudes.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of Low-Speed Precision Control of a Butterfly-Shaped Linear Ultrasonic Motor

et al. 2020

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The control performance of a butterfly-shaped linear ultrasonic motor is not good when the target speed is less than 1 mm/s by traditional methods. To improve low-speed controlling characteristics of linear ultrasonic motor, a closed-loop control strategy by using both the step control and the fuzzy PID control was proposed. The controller was constructed with the function of providing a closed-loop control of the speed by adjusting the driving voltage amplitude in stepping driving mode. The corresponding step controlling parameters were determined by experiments. Comprehensive experiments on the developed control strategy were conducted under different target speeds. There was a maximum of 24.5% speed error at the target speed of 10 μm/s, meanwhile, the coefficient of variation and the response time were 16.3% and 0.11 s, respectively. With the triangular or sinusoidal waves speed tracking curves at amplitude of 1 mm/s, the maximum speed tracking error were 0.1 mm/s and 0.15 mm/s respectively. Thus, a good speed tracking performance was obtained. These results support the functional ability and potential of the proposed method as a low-speed precision control method for linear ultrasonic motors. INDEX TERMS linear ultrasonic motor, step control, fuzzy PID control, low speed NOMENCLATURE Coefficient of variation Maximum speed error of the platform Speed error of the platform Change of speed error of the platform Proportional coefficient of the PID controller Initial value of proportional coefficient Change of proportional coefficient Integral coefficient of the PID controller Initial value of integral coefficient Change of integral coefficient Differential coefficient of the PID controller Initial value of differential coefficient Change of differential coefficient Number of driving waves of the driving signal Set speed of the platform Coefficient of determination Driving period of the driving signal Average speed of the platform Actual position of the platform Actual speed of the platform Standard deviation of the platform speed

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improvement of Low-Speed Precision Control of a Butterfly-Shaped Linear Ultrasonic Motor

et al. 2020

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“…Under no load conditions, measure the speed under different loads. According to the measurement result, when U m is less than 0.85V, the LUSM will become unstable, The reason is that when the LUSM reaches a lower speed, the drop of SVA will intensify the influence of the stick-slip phenomenon, which brings instability of movement [28]. Therefore, control U m to stabilize at 0.85V, 0.93V, 1.01V, 1.09V, 1.17V, 1.25V, 1.33V, 1.41V, 1.49V, 1.57V, 1.65V, 1.73V, 1.81V, 1.89V, 1.97V and 2.05V, respectively.…”

Section: Stator Vibration Amplitude-speed Output Force-speed Curve and Calculation Of The Stator Vibration Amplitude To Be Compensatedmentioning

confidence: 99%

Speed Sensorless Control of Linear Ultrasonic Motors Based on Stator Vibration Amplitude Compensation

Yan

Yang

et al. 2020

Sensors

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In some applications of linear ultrasonic motors (LUSMs), not installing speed/position sensors can reduce the size and cost of the system, changes in load will cause fluctuations in the speed of the LUSM. To eliminate the influence of load changes on speed, a speed sensorless control scheme based on stator vibration amplitude compensation (SSCBVC) is proposed. This scheme is implemented under the framework of the stator vibration amplitude-based speed control (VBSC) and frequency tracking. Based on the stator vibration amplitude-speed and the output force-speed curves of the LUSM, the relationship between the load changes and stator vibration amplitude (SVA) to be compensated is established, realizing a speed sensorless control of the LUSM under variable load conditions. The experimental results show that the maximum fluctuation of the speed is about 2.2% when the output force changes from 0 to 6 N with SSCBVC. This scheme can effectively reduce the influence of load changes on the speed of the LUSM without using speed/position sensors.

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A low-speed linear stage based on vibration trajectory control of a bending hybrid piezoelectric ultrasonic motor

Tian

Shen

et al. 2019

Mechanical Systems and Signal Processing

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Control of an ultrasonic transducer to realize low speed driven

Cited by 6 publications

References 5 publications

Improvement of Low-Speed Precision Control of a Butterfly-Shaped Linear Ultrasonic Motor

Improvement of Low-Speed Precision Control of a Butterfly-Shaped Linear Ultrasonic Motor

Speed Sensorless Control of Linear Ultrasonic Motors Based on Stator Vibration Amplitude Compensation

A low-speed linear stage based on vibration trajectory control of a bending hybrid piezoelectric ultrasonic motor

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