dc.contributor.author | Niemann, Andries C. | |
dc.contributor.author | Van Schoor, George | |
dc.contributor.author | Du Rand, Carel P. | |
dc.date.accessioned | 2016-02-08T09:44:58Z | |
dc.date.available | 2016-02-08T09:44:58Z | |
dc.date.issued | 2013 | |
dc.identifier.citation | Niemann, A.C. et al. 2013. A self-sensing active magnetic bearing based on a direct current measurement approach. Sensors, 13(9):12149-12165. [https://doi.org/10.3390/s130912149] | en_US |
dc.identifier.issn | 1424-8220 (Online) | |
dc.identifier.uri | http://hdl.handle.net/10394/16210 | |
dc.identifier.uri | https://www.mdpi.com/1424-8220/13/9/12149 | |
dc.identifier.uri | https://doi.org/10.3390/s130912149 | |
dc.description.abstract | Active magnetic bearings (AMBs) have become a key technology in various industrial applications. Self-sensing AMBs provide an integrated sensorless solution for position estimation, consolidating the sensing and actuating functions into a single electromagnetic transducer. The approach aims to reduce possible hardware failure points, production costs, and system complexity. Despite these advantages, self-sensing methods must address various technical challenges to maximize the performance thereof. This paper presents the direct current measurement (DCM) approach for self-sensing AMBs, denoting the direct measurement of the current ripple component. In AMB systems, switching power amplifiers (PAs) modulate the rotor position information onto the current waveform. Demodulation self-sensing techniques then use bandpass and lowpass filters to estimate the rotor position from the voltage and current signals. However, the additional phase-shift introduced by these filters results in lower stability margins. The DCM approach utilizes a novel PA switching method that directly measures the current ripple to obtain duty-cycle invariant position estimates. Demodulation filters are largely excluded to minimize additional phase-shift in the position estimates. Basic functionality and performance of the proposed self-sensing approach are demonstrated via a transient simulation model as well as a high current (10 A) experimental system. A digital implementation of amplitude modulation self-sensing serves as a comparative estimator | en_US |
dc.language.iso | en | en_US |
dc.publisher | MDPI | en_US |
dc.subject | Self-sensing | en_US |
dc.subject | active magnetic bearing (AMB) | en_US |
dc.subject | direct current measurement (DCM) | en_US |
dc.subject | position estimation | en_US |
dc.subject | magnetic suspension | en_US |
dc.subject | duty cycle | en_US |
dc.title | A self-sensing active magnetic bearing based on a direct current measurement approach | en_US |
dc.type | Article | en_US |
dc.contributor.researchID | 12134457 - Van Schoor, George | |
dc.contributor.researchID | 11790199 - Du Rand, Carel Petrus | |
dc.contributor.researchID | 12120715 - Niemann, Andries Christiaan | |