Theoretical modeling and experimental investigation on a novel screwed-type piezoelectric focusing mechanism for space cameras

Jia, Botao; Wang, Liang; Wang, Ruifeng; Jin, Jiamei; Wu, Dawei

doi:10.1016/j.ymssp.2022.108844

Cited by 20 publications

(4 citation statements)

References 33 publications

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“…Linear ultrasonic motors (LUMs) are widely used in highprecision applications like moving platforms, robotic joints, and camera apertures due to their advantages such as deenergized self-locking and micro-nano displacement resolution capabilities [1][2][3]. LUMs operate by converting electrical energy into vibration and utilizing friction between the stator and slider to achieve precise positioning.…”

Section: Introductionmentioning

confidence: 99%

Research on the mechanism and control methods of mechanical drift in linear ultrasonic motors

Li,

Yao,

2024

Smart Mater. Struct.

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Linear ultrasonic motors (LUMs) have advantages such as de-energized self locking and-micro-nano displacement resolution. However, the presence of mechanical drift negatively affects their positioning and control accuracy, thereby limiting their application in ultra-precision fields. The mechanism of mechanical drift in the motor is currently unclear. In this study, we initially employ the Burgers model for the stator’s clamp and consider the internal friction and stick-slip effects of the slider, enabling the establishment of a non-autonomous dynamic model of the LUM. This model serves as a tool to delve into the mechanism causing mechanical drift. Subsequently, using this established dynamic model, we investigate how the LUM's structural parameters influence mechanical drift and seek methods to mitigate this undesirable phenomenon. Finally, we validate the model's validity and analyze the effects of different clamps on mechanical drift through experimental research. The research findings reveal that the mechanical drift in the LUM is primarily due to structural creep, with the clamp playing a pivotal role in driving the drift. Increasing the tangential stiffness of the clamp component and slider internal friction prove to be effective approaches to reducing mechanical drift. This study holds substantial theoretical and practical significance as it deepens understanding of the mechanisms of mechanical drift in LUMs and offers a pathway to achieve effective drift control.

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Section: Introductionmentioning

confidence: 99%

Research on the mechanism and control methods of mechanical drift in linear ultrasonic motors

Li,

Yao,

2024

Smart Mater. Struct.

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“…The electromechanical coupling model is established using the transfer matrix method, and the prototype is made to verify the correctness of the model. This kind of actuator uses thread self-locking to suppress the generation of backward motion, which can achieve high-precision linear positioning and large thrust-weight ratio actuation [ 34 ]. Burhanettin Koc et al proposed a kinetic model to describe the condition under which slippage can occur between a slider and a stator.…”

Section: Introductionmentioning

confidence: 99%

Design and Experiment of a Clamping-Drive Alternating Operation Piezoelectric Actuator

2023

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In recent years, piezoelectric actuators, represented by inertial and inchworm actuators, have been widely applied because of their high accuracy and excellent responsiveness. Despite the development of various piezoelectric actuators, there remain some flaws in this technology. The sticking point is that the piezoelectric actuators based on the friction driving principle are prone to unwanted backward motion when outputting stepping motion. It is thus urgent to explore solutions from the perspectives of principle and structure. In this paper, a clamping-drive alternating operation piezoelectric actuator is proposed, the two feet of which are driven by two piezoelectric stacks, respectively. Due to double-foot alternate drive guide movement, backward movement is prevented in theory. By adopting the double-layer stator structure, integrated processing and assembly are facilitated. Meanwhile, a double flexible hinge mechanism is installed in the stator to prevent the drive foot from being overturned due to ineffectiveness and premature wear. In addition, the stator is equipped with the corresponding preload mechanism and clamping device. After the cycle action mechanism of one cycle and four steps is expounded, a model is established in this study to further demonstrate the principle. With the prototype produced, a series of experiments are performed. In addition, the amplitude of actuation of the stator is tested through amplitude experiment. The performance of the stator is evaluated by conducting experiments in the alternating step and single step actuation modes. Finally, the test results are analyzed to conclude that the actuator operating in either of these two modes can meet the practical needs of macro and micro actuation.

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“…As typical direct drive type actuators, piezoelectric motors utilize mechanical vibrations in ultrasonic range as their driving source [1][2][3][4]. Two voltages with 90-degree phase difference should normally be applied to piezoelectric ceramic (PZT) elements in order to excite operating modes.…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, the most representative piezoelectric motors include single mode motor which exploits two bending modes with the same order number [4][5][6], and composite mode motor which utilizes two different types of vibrational modes, such as longitudinal-bending [6][7][8], longitudinal-torsional [9,10], and bending-torsional modes [11,12]. However, the working modes of existing piezoelectric motors are typically fixed and should be simultaneously excited [13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Research on interactions between different operating modes of piezoelectric motors

Li,

Chen

2023

Smart Mater. Struct.

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This paper explores interactions between multiple operating modes of piezoelectric motors. The developed motor can operate in the second-order in-plane bending modes (I), the third-order in-plane bending modes (II) and the first-order out-of-plane bending modes (III). These working modes excited separately and simultaneously, can be manipulated electronically. Each of the vibrational modes can both be driven by applying single-phase and two-phase voltages to piezoelectric ceramic plates. In order to produce all the vibration states, the structural parameters of stator were strictly designed to harmonize two eigenfrequencies of each type of vibrational modes by using finite element software ANSYS. Displacement characteristics of stator driving particles under all vibration states were calculated to evaluate mutual effects of different operating modes. Simulation results reveal that the superposition of I and II corresponds to a mode with lower resonance frequency and larger vibration amplitude in stator body. For the designed motor, the conjunction of modes I and II actually forms the first-order in-plane vibrational mode B01. Therefore, the response displacement of stator driving points reaches the maximum value when modes I and II are conjointly actuated by supplying single-phase excitation voltage under the premise of undistorted three-dimensional motion trajectory. The motor performances under that condition were also investigated experimentally. The dimension of the fabricated prototype motor is 10 mm × 10 mm × 20 mm. The stall torque is 0.2 N·m under 200 V single-phase excitation, when the motor operates in modes I and II simultaneously. The maximum no-load speed is 74 r min−1. Compared with separate actuation of vibrational modes I and II, mechanical properties of the prototype motor are significantly improved.

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Theoretical modeling and experimental investigation on a novel screwed-type piezoelectric focusing mechanism for space cameras

Cited by 20 publications

References 33 publications

Research on the mechanism and control methods of mechanical drift in linear ultrasonic motors

Research on the mechanism and control methods of mechanical drift in linear ultrasonic motors

Design and Experiment of a Clamping-Drive Alternating Operation Piezoelectric Actuator

Research on interactions between different operating modes of piezoelectric motors

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