Title :
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
fDate :
2/1/2000 12:00:00 AM
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;
Journal_Title :
Industrial Electronics, IEEE Transactions on
