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Appl. Sci. 2018, 8(8), 1270; https://doi.org/10.3390/app8081270

Complementary Cooperation of Dual Power Circuits to Drive Active Magnetic Bearings

Department of Mechanical Engineering, National Cheng Kung University; Tainan 70101, Taiwan
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Received: 18 May 2018 / Revised: 23 July 2018 / Accepted: 25 July 2018 / Published: 31 July 2018
(This article belongs to the Section Mechanical Engineering)
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Abstract

A compact-design hybrid power amplifier for AMB (active magnetic bearing) units, named as dual cooperative drive circuit (DC2), is designed and verified by intensive experiments. DC2 can operate under dual mode: either digital driving mode (DDM) or analog driving mode (ADM). By taking advantages of the complementary cooperation between DDM and ADM, the proposed DC2 manifests its superiorities mainly in three aspects: (i) Compared to a traditional 2-level PWM (pulse width modulation) drive circuit, the improvement degree of reducing the amplitudes of current ripples is up to 62%. (ii) By taking advantages of mutually complementary cooperation between DDM and ADM, the steady-state errors of output current, which is exerted to the coils of AMBs, can be much reduced by DC2. (iii) DC2 can provide a high-current slew rate so that the response of AMBs is fast and quick enough to regulate the high-speed rotor back to the neutral position within a very short time period below 0.40 ms. In addition, the proposed DC2 is particularly suitable to be compliant with digital controllers and DSPs (digital signal processors) since the commands or drive sequences are all in DC (direct current) manner. View Full-Text
Keywords: active magnetic bearing; rotor position regulation; drive circuit; pulse width modulation active magnetic bearing; rotor position regulation; drive circuit; pulse width modulation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Chiu, H.-L.; Tsai, N.-C. Complementary Cooperation of Dual Power Circuits to Drive Active Magnetic Bearings. Appl. Sci. 2018, 8, 1270.

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