High-efficiency linear power amplifier for active magnetic bearings

Author

Carabelli, Stefano ; Maddaleno, Franco ; Muzzarelli, Marco

Author_Institution

Lab. of Mechatronics, Politecnico di Torino, Italy

Volume

47

Issue

1

fYear

2000

fDate

2/1/2000 12:00:00 AM

Firstpage

17

Lastpage

24

Abstract

A modified class-G linear amplifier has been developed to improve the overall efficiency of a transconductance amplifier loaded with the high inductance and low resistance typical of the magnetic bearing coils. 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. Experimental results are reported that show a more than satisfactory agreement with the expected results and the developed theory

Keywords

coils; magnetic bearings; magnetic levitation; power amplifiers; active magnetic bearings; efficiency improvement; high inductance; high-efficiency linear power amplifier; low resistance; magnetic bearing coils; magnetic levitation; modified class-G linear amplifier; nonconstant load; power efficiency optimisation; rotor unbalance; transconductance amplifier; Coils; Force feedback; High power amplifiers; Immune system; Inductance; Machinery; Magnetic levitation; Power amplifiers; Transconductance; Voltage;

fLanguage

English

Journal_Title

Industrial Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0278-0046

Type

jour

DOI

10.1109/41.824021

Filename

824021