A miniature short stroke tubular linear actuator and its control
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Abstract:
Miniature actuators are the critical components in the robotic applications with high intelligence, high mobility and small scales. Among various types of actuators, linear actuators show advantages in many aspects. A miniature short stroke PM tubular linear actuator for the micro robotic applications is presented in this paper. The actuator is deliberately designed based on the optimal force capability and a proper sensorless control scheme is developed for the driving of the actuator. Experiment both on the prototype of the actuator and the drive system show the validity of the design.Keywords:
Linear actuator
Rotary actuator
This chapter considers the output device of the hydraulic control system. This device, which the authors call the actuator, is the mechanism that is responsible for delivering force and motion to the external load system of a given application. The chapter considers two actuator types: linear actuators and rotary actuators. It discusses the performance characteristics of linear actuators. These characteristics include a consideration of the actuator efficiency and the quasi-steady operation and function of the actuator. Four hydraulic actuators are used to operate a car lift that is used within an auto mechanic garage. The chapter also discusses the performance characteristics of rotary actuators. The efficiency equations for the rotary actuator (hydraulic motor) are similar to those of the hydraulic pump and the discussion of pump efficiency measurement is also applicable to the efficiency measurement of the hydraulic motor.
Rotary actuator
Electro-hydraulic actuator
Lift (data mining)
Linear actuator
Plant
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Special actuators are needed to control the orientation of large structures in space-based precision pointing systems. Electromagnetic actuators that presently exist are too large in size and their bandwidth is too low. Hydraulic fluid actuation also presents problems for many space-based applications. Hydraulic oil can escape in space and contaminate the environment around the spacecraft. A research study was performed that selected an electrically-powered linear actuator that can be used to control the orientation of a large pointed structure. This research surveyed available products, analyzed the capabilities of conventional linear actuators, and designed a first-cut candidate superconducting linear actuator. The study first examined theoretical capabilities of electrical actuators and determined their problems with respect to the application and then determined if any presently available actuators or any modifications to available actuator designs would meet the required performance. The best actuator was then selected based on available design, modified design, or new design for this application. The last task was to proceed with a conceptual design. No commercially-available linear actuator or modification capable of meeting the specifications was found. A conventional moving-coil dc linear actuator would meet the specification, but the back-iron for this actuator would weigh approximately 12,000 lbs. A superconducting field coil, however, eliminates the need for back iron, resulting in an actuator weight of approximately 1000 lbs.
Linear actuator
Rotary actuator
Plant
Plasma actuator
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Miniature actuators are the critical components in the robotic applications with high intelligence, high mobility and small scales. Among various types of actuators, linear actuators show advantages in many aspects. A miniature short stroke PM tubular linear actuator for the micro robotic applications is presented in this paper. The actuator is deliberately designed based on the optimal force capability and a proper sensorless control scheme is developed for the driving of the actuator. Experiment both on the prototype of the actuator and the drive system show the validity of the design.
Linear actuator
Rotary actuator
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Citations (5)
Abstract-today, an electromechanical actuator is one of the common mechanisms used in automatic devices and various systems. A linear actuator moves objects within a given distance with a certain accuracy. The paper contains the main criteria that affect the choice of actuator. This paper presents a model of the linear actuator and its main characteristics are given.
Linear actuator
Rotary actuator
Plant
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Powerful electromechanical linear actuator designed to replace hydraulic actuator that provides incremental linear movements to large object and holds its position against heavy loads. Electromechanical actuator cleaner and simpler, and needs less maintenance. Two principal innovative features that distinguish new actuator are use of shaft-angle resolver as source of position feedback to electronic control subsystem and antibacklash gearing arrangement.
Resolver
Rotary actuator
Position (finance)
Linear actuator
Position sensor
Plant
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An integrated and miniature linear actuator has been developed. Miniature BLDCM and rotation-linear translating mechanism are integrated into the actuator, in which the linear position, rotation position and limited position can be measured. The actuator has small size (Φ19×33 mm) and big output force (100 N). In this paper,a control system hardware of the actuator is built based on DS1103 control board, and the trajectory tracking of the actuator is realized based on PID control by using multiple sensors. The actuator and its control system have been successfully used in HIT dexterous robot hand.
Rotary actuator
Linear actuator
Position (finance)
Plant
Tracking (education)
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This research is aimed at generating an efficiency map for a linear hydraulic-actuator that is controlled using an open-centered 4-way valve. Using the basic configuration of a double rod, double-acting linear actuator, equations for describing the input and output power of the actuator are written and nondimensionalized to produce a nondimensional map for the efficiency of the actuator itself. In conclusion, the actuator is shown to operate below a wide open valve (WOV) line with efficiencies that are typically less than 50%. Note that the WOV line describes the maximum actuator-force that may be achieved at a given actuator-velocity. While the actuator chosen for this paper is common, extensions of the methods used in this study may be applied to double-acting, single-rod designs or single-acting, single-rod designs. Furthermore, it is anticipated that this type of analysis may also be used to study the effects of power regenerating valves and for predicting the efficiency improvements that may be gained for linear hydraulic-actuators that use this type of valve design.
Rotary actuator
Linear actuator
Electro-hydraulic actuator
Valve actuator
Plant
Line (geometry)
Fluid power
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Rotary actuator
Linear actuator
Linear motion
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Citations (66)
A novel sophisticated stepping linear actuator was proposed based on piezoelectric stack as actuator element.Its working principle was analyzed,and the structure of the stepping linear actuator and control wave voltage were designed.A model of actuator with linear rolling guide was established for reducing the sliding friction between the parts of actuator.A prototype of actuator was made,and its performance was tested.The experimental results show that the actuator has minimum step distance of 0.05 μm and maximum speed of 610 μm/s,it works steadily.
Linear actuator
Rotary actuator
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A new pneumatic linear actuator made of a thin flexible rubber is developed for locomotion in narrow paces. The actuator is named "tetra chamber actuator". This new actuator has an ability of object transportation and locomotion. The actuator was designed based on non-linear FEM analysis considering geometrical and material nonlinearity, fabricated and evaluated. The working principle of this actuator is based on a traveling elastic deformation wave drive and the actuator was designed to generate large track of the deformation and to have an ability of bidirectional propelling. The actuator shape was designed in detail using nonlinear FEM analysis and was fabricated by CAD/CAM system based on the results of analysis. The prototype is 107#x00D7;10mm in size. The experiments were made about its basic characteristics and object transportation ability. The prototype generates the motion about six times larger than that of conventional similar actuators to show its great potential.
Tetra
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