{"title":"A modified class G amplifier for active magnetic bearings","authors":"F. Maddaleno, Stefano Carabelli, M. Muzzarelli","doi":"10.1109/APEC.1997.581510","DOIUrl":null,"url":null,"abstract":"To improve the overall efficiency of a transconductance amplifier loaded by the high inductance and low resistance typical of the magnetic bearing coils, a modified class G amplifier has been developed. A third transistor has been connected from ground to output, in order to obtain high efficiency coil discharge. A simple theoretical characterization has been used to provide some diagrams to optimize the power efficiency as a function of a nonconstant load such as that due to a rotor unbalance. Experimentalal results are reported showing a good agreement with the developed theory.","PeriodicalId":423659,"journal":{"name":"Proceedings of APEC 97 - Applied Power Electronics Conference","volume":"8 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1997-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"6","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of APEC 97 - Applied Power Electronics Conference","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/APEC.1997.581510","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 6
Abstract
To improve the overall efficiency of a transconductance amplifier loaded by the high inductance and low resistance typical of the magnetic bearing coils, a modified class G amplifier has been developed. A third transistor has been connected from ground to output, in order to obtain high efficiency coil discharge. A simple theoretical characterization has been used to provide some diagrams to optimize the power efficiency as a function of a nonconstant load such as that due to a rotor unbalance. Experimentalal results are reported showing a good agreement with the developed theory.
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