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dc.contributor.authorNiemann, Andries C.
dc.contributor.authorVan Schoor, George
dc.contributor.authorDu Rand, Carel P.
dc.date.accessioned2016-02-08T09:44:58Z
dc.date.available2016-02-08T09:44:58Z
dc.date.issued2013
dc.identifier.citationNiemann, A.C. et al. 2013. A self–sensing active magnetic bearing based on a direct current measurement approach. Sensors, 13(9):12149-12165. [http://www.mdpi.com/journal/sensors]en_US
dc.identifier.issn1424-8220 (Online)
dc.identifier.urihttp://hdl.handle.net/10394/16210
dc.description.abstractActive 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 estimatoren_US
dc.description.urihttp://www.mdpi.com/journal/sensors
dc.description.urihttp://www.mdpi.com/1424-8220/13/9/12149
dc.description.uridoi:10.3390/s130912149
dc.language.isoenen_US
dc.publisherMDPIen_US
dc.subjectSelf-sensingen_US
dc.subjectactive magnetic bearing (AMB)en_US
dc.subjectdirect current measurement (DCM)en_US
dc.subjectposition estimationen_US
dc.subjectmagnetic suspensionen_US
dc.subjectduty cycleen_US
dc.titleA self–sensing active magnetic bearing based on a direct current measurement approachen_US
dc.typeArticleen_US
dc.contributor.researchID12134457 - Van Schoor, George
dc.contributor.researchID11790199 - Du Rand, Carel Petrus


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