Linear Position Sensing through Conductive Wall without Permanent Magnet

Vyhnánek, Jan; Ripka, Pavel; Chirtsov, Andrey

doi:10.3390/proceedings1040390

Cited by 3 publications

(3 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This type of sensor also requires complexsignal processing of the sensor array. Similar results were obtained using radial excitation by saddle coils [10].…”

Section: Introductionsupporting

confidence: 84%

Transformer position sensor for a pneumatic cylinder

Ripka

Mirzaei

Chirtsov

et al. 2019

Sensors and Actuators A: Physical

Self Cite

View full text Add to dashboard Cite

A novel transformer-based sensor for a pneumatic cylinder enables measurements of the piston position to be made through a thick conductive cylinder. Unlike existing industrial solutions, which are mainly based on a moving magnet, our se nsors do not require modifications to the parts inside the cylinder. Finite element analysis results are compared with me asurements at various piston positions and excitation fre quencies. Using a suitable model for the magnetic properties of the iron piston bar, we achieved good agreement between the model and reality. When the sensor is operated at 100 Hz, the sensitivity is 200 mV/FS and the raw linearity error is 1.6% of the full 400 mm stroke.

show abstract

“…This type of sensor also requires complexsignal processing of the sensor array. Similar results were obtained using radial excitation by saddle coils [10].…”

Section: Introductionsupporting

confidence: 84%

Transformer position sensor for a pneumatic cylinder

Ripka

Mirzaei

Chirtsov

et al. 2019

Sensors and Actuators A: Physical

Self Cite

View full text Add to dashboard Cite

show abstract

“…Complex signal processing of the sensor array is required for this type of sensor. Similar limitations were faced using radial excitation by saddle coils [9].…”

Section: Mehran Mirzaei Pavel Ripka and Vaclav Grimmentioning

confidence: 81%

A Novel Position Sensor With a Conical Iron Core

Mirzaei

Ripka

Grim

2020

IEEE Trans. Instrum. Meas.

Self Cite

View full text Add to dashboard Cite

A novel position sensor is presented in this paper for pneumatic and hydraulic cylinders applications. Solid iron core with conical shape surrounded by axisymmetric coils is an essential part of the proposed position sensor. Axisymmetric coils are used for e xcitation and voltage measurements. Annealing of conical solid iron core is also performed to homogenize magnetic properties and increase conical solid iron core permeability, which improve s position sensor performance in terms of sensitivity and linearity. Analytical and finite element analyses are utilized along with measurements in order to analyze the performance of position sensor. The me asurements of position sensors are performed for excitation coil inductance and pick up coils voltages. Different frequencies are considered for the analysis and measurements. The measurement results show the maximum linearity error is about 4% for the manufactured model and it is calculated maximum 1% for theoretical model.

show abstract

“…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. The method consists of placing excitation coils along the length of the cylinder, which changes the magnetic field due to interaction with the ferromagnetic piston rod.…”

Section: Introductionmentioning

confidence: 99%

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

Krause

Bhounsule

2018

Actuators

View full text Add to dashboard Cite

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.

show abstract

Linear Position Sensing through Conductive Wall without Permanent Magnet

Cited by 3 publications

References 2 publications

Transformer position sensor for a pneumatic cylinder

Transformer position sensor for a pneumatic cylinder

A Novel Position Sensor With a Conical Iron Core

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

Contact Info

Product

Resources

About