Evaluation of the Topology of Switching Power Amplifiers for Active Magnetic Bearings

Hu, Yefa; Yang, Kezhen; Guo, Xinhua; Zhou, Jian; Wu, Huachun

doi:10.3390/iecat2020-08521

Cited by 3 publications

(6 citation statements)

References 6 publications

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“…The two coils are differentially controlled, so the current on the middle phase leg is constantly twice the bias current, which is exactly the maximum current of the phase legs on either side in the most extreme case. Thus, the selection and design of the middle switch S 0 can be consistent with the switches S 1 and S 2 on both sides, except that the heat dissipation needs special consideration [13]. The consistency of components is of great significance for the large-scale application of the three-phase-half-bridge topology SPA in the industrial field.…”

Section: Three-phase-half-bridge Topologymentioning

confidence: 98%

“…Coil 8 To fully reduce the current on the neutralized shared phase leg, two coils controlling one axis are arranged in the same group [13]. One group of coils is composed of two pairs of coils which control two DOFs, and the current IN on the neutralized shared phase leg is obtained by subtracting the bias current of the two groups of coils.…”

Section: Neutralized-sharing-bridge Topologymentioning

confidence: 99%

“…However, these studies have mainly focused on reducing the number of switches and verifying the feasibility of basic functions of SPAs with a novel topology. Hu Yefa et al [13] evaluated different topologies but gave guidance of SPA topologies selection only in case of different coil pair arrangements and bias current distributions. There is a lack of a comprehensive analysis and evaluation of SPAs, especially in terms of the analysis of the cost, accuracy, and rapidity of its output current.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Switching Power Amplifier Topology for Active Magnetic Bearings

Yang

Guo

et al. 2021

Actuators

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Active magnetic bearings (AMBs) have led to great progress in the field of rotating machinery due to their many advantages, such as their non-contact and non-lubrication properties. As the key component of an AMB actuator, the switching power amplifier has an important impact on the performance of magnetic bearings and rotating machinery. In this paper, the topologies of switching power amplifiers for AMBs are introduced. The traditional half-bridge topology and two newly proposed topologies—the three-phase-half-bridge and neutralized-sharing-bridge topology—are analyzed and discussed. The volume, current output performance and cost of the power amplifier with different topologies are comprehensively evaluated, providing a theoretical basis and guidance for the selection and design of the topology of switching power amplifiers for AMBs under different conditions.

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Section: Three-phase-half-bridge Topologymentioning

confidence: 98%

Section: Neutralized-sharing-bridge Topologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of Switching Power Amplifier Topology for Active Magnetic Bearings

Yang

Guo

et al. 2021

Actuators

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“…Among these advancements, magnetic bearing technology has attracted considerable attention as it enables precise and intelligent control of high-speed rotation systems as well as its advantages in terms of energy efficiency, lack of lubrication, high rotational speed capability, and precision control. [1][2][3][4][5][6][7][8] Magnetic bearings can be classified into two main types based on their magnetic flux paths: homopolar and heteropolar. The former maintains the same polarity in all radial directions, whereas the latter exhibits varying polarities.…”

Section: Introductionmentioning

confidence: 99%

Comparative study on heteropolar/homopolar magnetic bearings for high-speed rotating applications

Noh,

Park,

Shin

et al. 2024

AIP Advances

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Bearing technology must be supported to attain high-speed and high-efficiency rotating applications. Previous research focused on performance enhancement and optimization, rather than comparative studies among magnetic bearings. This study presents the design and comparison of five magnetic bearing types for high-speed rotating applications: an 8-pole conventional heteropolar, fork-type heteropolar, hybrid fork-type homopolar, and hybrid homopolar magnetic bearings. For quantitative evaluation, mechanical parameters were selected to ensure a uniform coil volume and current supply. The heteropolar magnetic bearings employed 35PN440 steel, whereas the homopolar magnetic bearings utilized pure solid iron. The bias currents were determined based on the respective material properties. The driving circuits were compared by comparing models with and without permanent magnets. The magnetic flux density was assessed at equilibrium and maximum control current, and the loss characteristics were evaluated at 30 000 rpm. Linear control regions were identified by analyzing the relationships between the electromagnetic force, current, and displacement. As a result, the most suitable magnetic bearing for high-speed rotating applications is proposed.

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“…A further drawback of this typology is a fixed star point and the enormous stress on the transistor of the shared leg. The reversed shared leg bridge [22] reduces the stress at the transistor of the shared leg. A good trade-off provides the series-winding topology [23], which requires the phases to be decoupled.…”

Section: Introductionmentioning

confidence: 99%

Design and Implementation of a Driving Strategy for Star-Connected Active Magnetic Bearings with Application to Sensorless Driving

et al. 2022

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For decades, sensorless position estimation methods gained lots of interest from the research community, especially in the field of electric drives and active magnetic bearings (AMBs). In particular, the direct flux control (DFC) technique promises unique advantages over other sensorless techniques, such as a higher bandwidth, but on the other hand, it requires the coils to be connected in a star topology. Until now, star-point connections are rarely found on active magnetic bearings. In consequence, there is no known publication about the application of the DFC to an AMB to this date. In order to apply the DFC to an AMB, a star-point driving approach for AMBs must be developed beforehand. A star-connected driving approach, capable of driving a four-phase AMB, is proposed and validated against traditional H-bridges in a simulation. Further, the strategy is tested in a physical application and generalised for 4∗n phases. In terms of current dynamics, the simulation results can be compared to the well-known full H-bridge driving. The experiments on the physical application show that the actual current in the coils follows a reference with satisfactory accuracy. Moreover, the inductance measurements of the coils show a strong dependency on the rotor’s position, which is crucial for sensorless operation. A star-point connection delivers a satisfying response behaviour in an AMB application, which makes sensorless techniques that require a star point, such as the DFC, applicable to active magnetic bearings.

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Evaluation of the Topology of Switching Power Amplifiers for Active Magnetic Bearings

Cited by 3 publications

References 6 publications

Evaluation of Switching Power Amplifier Topology for Active Magnetic Bearings

Evaluation of Switching Power Amplifier Topology for Active Magnetic Bearings

Comparative study on heteropolar/homopolar magnetic bearings for high-speed rotating applications

Design and Implementation of a Driving Strategy for Star-Connected Active Magnetic Bearings with Application to Sensorless Driving

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