Non-contact position sensing of five axes for linear motor systems
ID:286 View Protection:ATTENDEE Updated Time:2021-06-19 16:58:40 Hits:172 Oral Presentation

Start Time:2021-07-03 10:10 (Asia/Shanghai)


Session:[S3] Concurrent Session 3 [S3-2] Oral Session 13 &16

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When it comes to the control of a linear motors, the position sensor system moves into focus. Commercially available sensor systems are more than sufficient for many applications and meet their requirements without difficulty. This changes when the focus is for example on canned tubular (oscillatory) linear motors. The critical requirements are here the rather large quasi air-gap resulting from the encapsulated mover, the encapsulation itself and the restricted construction space. When the system demands bush bearings, the radial position of the mover is required for condition monitoring in addition to the obviously required axial position information of the mover. With a low-cost requirement put on top, a new eddy current position sensory system is proposed and investigated in this paper. The sensor system consists of four sensor coils equally distributed around the circumference and arranged opposite conical surfaces at both ends of the mover. All eight coils together form a low-cost eddy current position measurement system capable of determining the position of the mover in five axes. The paper analyzes the relevant systematic errors and shows how the sensors must be positioned and evaluated to eliminate these errors. Moreover the proposed evaluation strategy rejects common mode errors, decouples and linearizes the sensor output of the axes. A manufactured prototype of the system validates the simulated results, demonstrates the performance and shows the accuracy limits of the system.
Eddy current sensor, absolute linear sensor, low-cost eddy current sensor, five axes sensor, cone shaped target, multi axis sensor
Florian Poltschak
Johannes Kepler University Linz

Florian Poltschak is the deputy head of the JKU HOERBIGER Research Institute for Smart Actuators at the Johannes Kepler University of Linz since 2010. He holds a Masters’ degree in Mechatronics from the Loughborough University, UK and diploma as well as Phd. degree in Mechatronics from the Johannes Kepler University Linz.
He leads about 10 industry-academia research cooperation projects each year in the field of smart electromagnetic actuation, direct drives, integrated sensory, (embedded) digital signal processor control systems.

Submission Author
Florian Poltschak Johannes Kepler University Linz
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