Next Article in Journal
Dynamic Modeling and Control of Antagonistic Variable Stiffness Joint Actuator
Next Article in Special Issue
Design Method of Bearingless Permanent Magnet Slice Motor for Maglev Centrifugal Pump Based on Performance Metric Cluster
Previous Article in Journal
Feedback Linearization of Inertially Actuated Jumping Robots
Article

Three-Axis Inductive Displacement Sensor Using Phase-Sensitive Digital Signal Processing for Industrial Magnetic Bearing Applications

School of Energy Systems, Lappeenranta-Lahti University of Technology LUT, Skinnarilankatu 34, 53850 Lappeenranta, Finland
*
Author to whom correspondence should be addressed.
Academic Editor: Satoshi Ueno
Actuators 2021, 10(6), 115; https://doi.org/10.3390/act10060115
Received: 29 April 2021 / Revised: 24 May 2021 / Accepted: 26 May 2021 / Published: 31 May 2021
(This article belongs to the Special Issue Magnetic Bearings: From Theory to Applications)
Non-contact rotor position sensors are an essential part of control systems in magnetically suspended high-speed drives. In typical active magnetic bearing (AMB) levitated high-speed machine applications, the displacement of the rotor in the mechanical air gap is measured with commercially available eddy current-based displacement sensors. The aim of this paper is to propose a robust and compact three-dimensional position sensor that can measure the rotor displacement of an AMB system in both the radial and axial directions. The paper presents a sensor design utilizing only a single unified sensor stator and a single shared rotor mounted target piece surface to achieve the measurement of all three measurement axes. The sensor uses an inductive measuring principle to sense the air gap between the sensor stator and rotor piece, which makes it robust to surface variations of the sensing target. Combined with the sensor design, a state of the art fully digital signal processing chain utilizing synchronous in-phase and quadrature demodulation is presented. The feasibility of the proposed sensor design is verified in a closed-loop control application utilizing a 350-kW, 15,000-r/min high-speed industrial induction machine with magnetic bearing suspension. The inductive sensor provides an alternative solution to commercial eddy current displacement sensors. It meets the application requirements and has a robust construction utilizing conventional electrical steel lamination stacks and copper winding. View Full-Text
Keywords: digital signal processing; displacement measurement; inductive sensor; magnetic bearings; rotor system digital signal processing; displacement measurement; inductive sensor; magnetic bearings; rotor system
Show Figures

Figure 1

MDPI and ACS Style

Sillanpää, T.; Smirnov, A.; Jaatinen, P.; Vuojolainen, J.; Nevaranta, N.; Jastrzebski, R.; Pyrhönen, O. Three-Axis Inductive Displacement Sensor Using Phase-Sensitive Digital Signal Processing for Industrial Magnetic Bearing Applications. Actuators 2021, 10, 115. https://doi.org/10.3390/act10060115

AMA Style

Sillanpää T, Smirnov A, Jaatinen P, Vuojolainen J, Nevaranta N, Jastrzebski R, Pyrhönen O. Three-Axis Inductive Displacement Sensor Using Phase-Sensitive Digital Signal Processing for Industrial Magnetic Bearing Applications. Actuators. 2021; 10(6):115. https://doi.org/10.3390/act10060115

Chicago/Turabian Style

Sillanpää, Teemu, Alexander Smirnov, Pekko Jaatinen, Jouni Vuojolainen, Niko Nevaranta, Rafal Jastrzebski, and Olli Pyrhönen. 2021. "Three-Axis Inductive Displacement Sensor Using Phase-Sensitive Digital Signal Processing for Industrial Magnetic Bearing Applications" Actuators 10, no. 6: 115. https://doi.org/10.3390/act10060115

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop