Research on the Performance of 3-State Power Amplifiers for Magnetic Bearings

Abstract:

The performance of the power amplifier is closely related to their hardware components and current control modes. The work was focused on comparison of the experimental results based on different current sensors and the application of two different current control modes for 3-state amplifiers. When the same control mode was used, three kind of current sensors were tested and the corresponding amplifier current ripples were measured. Experimental results shown that when using a faster current sensor, the amplifier achieved smaller current ripples. Then a 3-state PWM current control mode and a Sample-Hold current control mode were compared based on the power amplifier circuit with the same hardware components. The performance difference in the experiments were studied and explained. The 3-state PWM power amplifier could achieve a better performance in actual use.

• Periodical: Applied Mechanics and Materials (Volume 389)
• Pages: 245-250
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.389.245
• Online since: August 2013
• Authors: Zhi Li Li, Kai Zhang, Xing Jian Dai
• Keywords: 3-State Modulation, Power Amplifier, PWM, Sample-Hold

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