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.
Highlights
Active magnetic bearings (AMBs) are able to levitate the interested objects in a fashion of no friction and no mechanical wear
digital driving mode (DDM) and analog driving mode (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
The proposed DC2 is suitable to be compliant with digital controllers and DSPs since the commands or drive sequences are all in direct current (DC) manner
Summary
Active magnetic bearings (AMBs) are able to levitate the interested objects in a fashion of no friction and no mechanical wear. Most of the drive circuits applied to AMBs are of analog type [1,2]. The main shortcoming of digital drive circuits to AMBs is: severe current ripple induced. Compact-design hybrid power amplifier for AMB units, named as dual cooperative drive circuit. 1. Compared with the drive circuit, two essential electronic components, a digital to analog converter (DAC). When the two MOSFETs are turned on, shown, the switching power amplifier operates at charge state. Since DC2 conducts under two distinct operation modes, i.e., DDM and ADM, two pulse width modulation-tuning processors (PWM-TPs) are required to appropriately tune the output current to modulation-tuning processors (PWM-TPs) are required to appropriately tune the output current to the the AMB unit. The schematic diagram for the PWM-TPs of DC2 is shown inre Figure f i.e., is the ref DDM and ADM.
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