A general framework for the analysis and design of tubular linear permanent magnet machines

Wang, Jiabin; Jewell, G.W.; Howe, D.

doi:10.1109/20.764898

Cited by 262 publications

(39 citation statements)

References 16 publications

(25 reference statements)

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“…Therefore, the vector magnetic potential A only has the component A θ , and the magnetic field analysis can be divided into two regions: the air gap and winding space (region I) and the permanent magnets space (region II), as shown in Figure 3. The governing equations in terms of the vector magnetic potential A θ are presented as follows [23,24]:…”

Section: Theoretical Analysismentioning

confidence: 99%

Comparative Analysis and Experimental Verification of a Linear Tubular Generator for Wave Energy Conversion

Xia

Guo

2018

Energies

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To improve the power density and reliability of radial (RS-TLPMG) and quasi-Halbach (QH-TLPMG) magnetization tubular linear surface-mounted permanent magnet generators under realistic sea-state conditions, a novel tubular linear generator with multilayer interior permanent magnets (MI-TLPMG) for wave energy conversion is proposed and analyzed in this paper. Using finite element analysis (FEA), a comprehensive comparison of air gap flux density, flux linkage, back electromotive force (back-EMF), load, and no-load performance is investigated to verify the advantages of the proposed machine. The FEA results indicate that MI-LTPMG with a flux-concentrating effect has higher back-EMF, air gap magnetic flux density, flux linkage, and output power than do the other two machines. Finally, a prototype is manufactured and measured on the test platform and wave tank. The experiment and simulation results show a great agreement with each other.

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Section: Theoretical Analysismentioning

confidence: 99%

Comparative Analysis and Experimental Verification of a Linear Tubular Generator for Wave Energy Conversion

Xia

Guo

2018

Energies

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“…In Figure 8a, the magnitude of stray flux measured at the air-gap is 0.004 T; in Figure 8b, the magnitude is 0.008 T; and in Figure 8c, the magnitude is 0.01 T. However, the magnitude range is considered acceptable and does not impact the performance of EMS operation [10]. The air-gap thickness can be decreased further, but 1 mm is considered small enough for manufacturing tolerance [11]. Thus, the air-gap is chosen to be as small as possible, which is 0.001 m. Table 2 shows the EMS parameters after the evaluation process.…”

Section: Findings and Discussionmentioning

confidence: 99%

Using magnetic field analysis to evaluate the suitability of a magnetic suspension system for lightweight vehicles

Isa¹,

Amer²,

Mahadi³

et al. 2016

Turk J Elec Eng & Comp Sci

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A suspension system in a vehicle acts as an isolator that isolates vibrations between the wheel tires and the vehicle body due to road irregularities. Additionally, a suspension system serves as a vehicle stabilizer that stabilizes the vehicle body during unusual driving patterns such as cornering, braking, or accelerating. A controllable suspension system has received significant attention in the automotive world in previous years since it can perform both of the aforementioned tasks without the presence of fluid damper. The study presented in this paper focuses on using magnetic flux density analysis to evaluate a number of parameters of an electromagnetic suspension system (EMS), so that it is suitable for usage in middle-sized passenger vehicles. The proposed EMS utilizes tubular linear actuator with a NdFeB permanent magnet. A number of dimensions of the EMS have been varied to observe their respective effect on force output and magnetic flux density. The purpose of this process was to determine what size of EMS will produce the same force as a standard suspension system, which has a maximum of 2000 N and an average of 800 N, according to quarter vehicle simulation that worked in parallel with this study.

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“…Assuming that any free current is absent in the interested regions, it is convenient to formulate the magnetic field distribution by means of scalar magnetic potential φ(r, z) defined by H = −∇φ, where H is the magnetic field intensity. Therefore, the governing equations for the magnetic field distributions of the ECD can be described as follows [24][25][26][27]:…”

Section: Magnetic Field Distributionmentioning

confidence: 99%

A passive eddy current damper for vibration suppression of a force sensor

Chen

Jiang

Liu

et al. 2013

J. Phys. D: Appl. Phys.

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High performance force sensors often encounter the problem of vibrations during the process of calibration and measurement. To address this problem, this paper presents a novel passive eddy current damper (ECD) for vibration suppression. The conceived ECD utilizes eight tubular permanent magnets, arranged in Halbach array, and a conductive copper rod to generate damping. The ECD does not require an external power supply or any other electronic devices. In this paper, an accurate, analytical model for calculating the magnetic field distribution and damping coefficient is developed. The dynamics of the system is obtained by applying an energy method and an equivalent pseudo-rigid-body model. Moreover, finite element simulations are conducted to optimize the design. Experiments are carried out to validate the effectiveness of the design. The results indicate that the proposed ECD has a damping coefficient of 4.3 N s m −1 , which can provide a sufficient damping force to quickly suppress the sensor's vibration within 0.1 s.

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A general framework for the analysis and design of tubular linear permanent magnet machines

Cited by 262 publications

References 16 publications

Comparative Analysis and Experimental Verification of a Linear Tubular Generator for Wave Energy Conversion

Comparative Analysis and Experimental Verification of a Linear Tubular Generator for Wave Energy Conversion

Using magnetic field analysis to evaluate the suitability of a magnetic suspension system for lightweight vehicles

A passive eddy current damper for vibration suppression of a force sensor

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