A Study on Magnetic Force Characteristics Between Two Cuboidal Permanent Magnets

Qu, Chuan; Pei, Yong-Chen; Liu, Zhenxing

doi:10.1007/s10948-021-05927-6

Cited by 9 publications

(2 citation statements)

References 27 publications

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“…The equivalent magnetic charge method is applied to the modeling of PMB. This method regards the direction of the non-magnetized magnetic dipole inside the permanent magnet ring as random, and does not show magnetism to the outside [91]. When there is an external electric field, the magnetic dipoles are arranged neatly in the permanent magnet, and N S poles appear at both ends of the whole.…”

Section: Equivalent Magnetic Charge Methodsmentioning

confidence: 99%

Magnetic Bearing: Structure, Model and Control strategy

Huang,

Li,

Zhou

et al. 2023

Preprint

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Bearings are crucial transmission components that offer support to mechanical rotating bodies. Nevertheless, traditional bearing failure due to friction and wear more easily. In scenarios involving ultra-high speeds and extreme applications, minimizing bearing losses and enhancing performance becomes especially vital. Magnetic bearings, characterized by zero friction, no need for lubrication, and high-speed capabilities, offer a viable solution to the issue of bearing failure attributed to friction. However, there is currently a shortage of comprehensive review literature that delves into the structural attributes, modeling mechanisms, and control strategies of magnetic bearings. This article will perform a comprehensive literature review on magnetic bearings, addressing the aforementioned aspects and discussing their core technologies. Firstly, from the perspective of classification and magnetic circuit structure analysis, the properties and characteristics of various magnetic bearings are discussed. Secondly, the working principle and performance of mathematical models of magnetic bearings with different structures are described, and the modeling steps and optimization schemes are summarized. Furthermore, the influence of control strategy of magnetic bearing on the control performance of magnetic bearing is summarized. Compared to PID control, modern control theory has achieved a performance improvement of nearly 50% in terms of improved position accuracy and adjustment time. Finally, the current research progress on magnetic bearings is summarized, and the current bottleneck issues are anticipated. This review contributes to a deeper understanding of the action mechanism and control method of magnetic levitation bearing, thus promoting the progress of magnetic levitation bearing technology.

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Section: Equivalent Magnetic Charge Methodsmentioning

confidence: 99%

Magnetic Bearing: Structure, Model and Control strategy

Huang,

Li,

Zhou

et al. 2023

Preprint

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“…To simplify the calculations, this study replaces the magnetic force between the arc magnet and the cube magnet with the magnetic force acting between the cuboidal magnets. A reliable model for two cuboidal permanent magnets with perpendicular magnetization directions was established by Qu et al [29]. The schematic diagram of the relative position of the two cuboidal permanent magnets with perpendicular magnetization directions is shown in figure 5.…”

Section: Model Analysismentioning

confidence: 99%

Double-speed piezoelectric–electromagnetic hybrid energy harvester driven by cross-moving magnets

Shi,

Hu,

Xia

et al. 2023

Smart Mater. Struct.

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Energy harvesters have gained popularity as green energy devices that transform mechanical energy from the environment into electricity. However, traditional piezoelectric energy harvesters are limited by narrowband response, and the output capability of electromagnetic energy harvesters is dependent on the rate of magnetic field changes on the coil, which is constrained by the device’s structure. To address these issues, this paper presents a hybrid energy harvester (HEH) that combines coils and arc magnets, forming an electromagnetic component (EMEH). Additionally, it incorporates a piezoelectric cantilever beam (PECB) as a piezoelectric component (PEH). Unlike traditional electromagnetic energy harvesters, this design utilizes two arc magnets to drive the rotating brackets, thereby achieving the opposite movement of the coil and magnet. This increases the relative velocity and consequently enhances the rate of magnetic field change on the coil. Simultaneously, it achieves frequency up-conversion by inducing vibration in the PECB through magnetic force. Under an external excitation of 5.5 Hz, the PEH achieves a maximum power of 0.362 mW at a load resistance of 330 kΩ, while the EMEH with 1200 turns of coil attains a maximum power of 8.74 mW at a load resistance of 110 Ω. The power density of the PEH reaches 94.96 μW cm−3. These results highlight the significant potential of the proposed energy harvester for powering low-power devices.

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