Sensors in position control applications for industrial automation

Reininger, Thomas; Welker, F.; Zeppelin, M. von

doi:10.1016/j.sna.2005.09.056

Cited by 42 publications

(24 citation statements)

References 3 publications

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“…3. Least squares fitting method minimized the formula ∑(outputi -estimated_outputi) 2 , where the estimated output function is known by the single-sensor measurement in Figure 4. This output function is supposed to be the same for all 16 sensors.…”

Section: Resultsmentioning

confidence: 99%

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Linear Position Sensing through Conductive Wall without Permanent Magnet

Vyhnánek

Ripka

Chirtsov

2017

Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017

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A linear position sensor for pneumatic actuators is presented. Position of the piston rod made of ferromagnetic material is detected by low frequency magnetic field which penetrates the aluminum wall of the cylinder. The sensor consists of an array of integrated fluxgate sensors and two excitation saddle coils mounted outside the actuator. The method does not need a permanent magnet attached to the piston as required by common magnetic position sensors.

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Section: Resultsmentioning

confidence: 99%

“…So far for position sensing a permanent magnet had to be installed in the piston and a DC-field sensor detected its position [2]. Magnetic field of the permanent magnet then has to be strong enough to ensure good signal to noise ratio to suppress DC field noise.…”

Section: Introductionmentioning

confidence: 99%

Linear Position Sensing through Conductive Wall without Permanent Magnet

Vyhnánek

Ripka

Chirtsov

2017

Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017

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“…Many types of sensors are used for this purpose. For common industrial applications, examples include: displacement sensors used for pneumatic applications [21]; low-cost potentiometers for position acquisition [22]; position estimation based on velocity measurements using high accuracy tachometers [23] and simultaneous sensing of position and speed using resolvers [24].…”

Section: B Selecting a Cost-effective Position Sensormentioning

confidence: 99%

Implementation of H-Infinity Control Algorithms for Sensor-Constrained Mechatronic Systems Using Low-Cost Microcontrollers

Bautista-Quintero

Pont

2008

IEEE Trans. Ind. Inf.

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This paper introduces a novel method which is intended to assist in the design and implementation of optimal H-infinity ( ) algorithms in low-cost mechatronic applications. The particular problem considered is position control in a situation where there are both sensor-related uncertainties (caused by lowresolution sensors) and limited computational resources. The first part of the method presented in this paper describes how to design the algorithm based on dynamic features of the sensor. The second part of the method involves finding a suitable numerical controller representation in order to reduce memory and CPU load. Evaluation of the method is based on empirical studies using three industrial sensors employed in a sub-acted robot. Results for a classic proportional integral derivative (PID) controller are included, in order to provide comparisons with the approach. In the empirical evaluation, the PID implementation shows marginal stability when the low-resolution sensor is employed; by contrast, the implementation is found to remain stable in the same circumstances.

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“…The advantage of such a system is that it is more durable than resistive sensing, but is more expensive and does not work well when the the cylinder has ferric materials that will interfere with the magnetic field. Other work in non-contact sensing involves the detection of changes in the magnetic field in primary and secondary coils placed around the cylinder as the magnet moves or the use of an array of Hall effect sensors placed along the cylinder length to measure the magnetic field [2]. Vyhnanek et al [3] used an alternate measurement system that does not require a permanent magnet, but needs a ferromagnetic piston rod.…”

Section: Introductionmentioning

confidence: 99%

A 3D Printed Linear Pneumatic Actuator for Position, Force and Impedance Control

Krause

Bhounsule

2018

Actuators

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Although 3D printing has the potential to provide greater customization and to reduce the costs of creating actuators for industrial applications, the 3D printing of actuators is still a relatively new concept. We have developed a pneumatic actuator with 3D-printed parts and placed sensors for position and force control. So far, 3D printing has been used to create pneumatic actuators of the bellows type, thus having a limited travel distance, utilizing low pressures for actuation and being capable of only limited force production and response rates. In contrast, our actuator is linear with a large travel distance and operating at a relatively higher pressure, thus providing great forces and response rates, and this the main novelty of the work. We demonstrate solutions to key challenges that arise during the design and fabrication of 3D-printed linear actuators. These include: (1) the strategic use of metallic parts in high stress areas (i.e., the piston rod); (2) post-processing of the inner surface of the cylinder for smooth finish; (3) piston head design and seal placement for strong and leak-proof action; and (4) sensor choice and placement for position and force control. A permanent magnet placed in the piston head is detected using Hall effect sensors placed along the length of the cylinder to measure the position, and pressure sensors placed at the supply ports were used for force measurement. We demonstrate the actuator performing position, force and impedance control. Our work has the potential to open new avenues for creating less expensive, customizable and capable actuators for industrial and other applications.

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Sensors in position control applications for industrial automation

Cited by 42 publications

References 3 publications

Linear Position Sensing through Conductive Wall without Permanent Magnet

Linear Position Sensing through Conductive Wall without Permanent Magnet

Implementation of H-Infinity Control Algorithms for Sensor-Constrained Mechatronic Systems Using Low-Cost Microcontrollers

A 3D Printed Linear Pneumatic Actuator for Position, Force and Impedance Control

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