International Journal of Applied Electromagnetics and Mechanics - Volume 58, issue 1

Authors: Yu, Qiang | Li, Wentao | Chu, Sai | Tian, Lisi | Wang, Xuesong | Cheng, Yuhu | Xia, Chenyang

Article Type: Research Article

Abstract: This paper introduces an optimal control model strategy to minimize system loss and meantime to maintain low torque ripple for a can-shielded switched reluctance machine (SRM). The system loss consists of semiconductor loss from power converter, as well as loss from the machine which not only includes traditional iron and copper losses, but also the characteristic ohmic can loss and friction loss due to the use of can shields. In particular, the can loss is calculated by Poynting’s theorem of magnetic energy conversion using a model of concentric layer structure. Loss of semiconductors considers temperature rise effect by an electro-thermal …coupling approach. The effectiveness is verified on a 3-phase 20 kW 12/8 canned SRM. Show more

Keywords: Switched reluctance machine, can shields, can loss, torque sharing function

DOI: 10.3233/JAE-180026

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 58, no. 1, pp. 1-13, 2018

Authors: Liu, Peng | Zhang, He | Ma, Shaojie | Shi, Yunlei

Article Type: Research Article

Abstract: A high-precision compact seed source for magnetic flux compression generators used an explosive-driven flyer high-power discharge switch was developed in this paper. And the deformation of the flyer in the switch was analyzed by numerical simulation. The compact seed source was a system (𝛷132 × 200 mm3 volume, weighing 12.5 kg, operating voltage 5 kV, storing energy ≮750 J, battery powered with full charge time less than 30 s) capable of delivering over 600 J (≮5.4 KA) into the magnetic flux compression generator (FCG, 42 μH, 78 mΩ) at static condition. On basis of the analysis of the …system composition, working principle and the best output sequence model, the test of coupling performance with FCG at dynamic condition has been carried out. The results show that the compact seed source was capable of coupling over 550 J (≮5.2 kA) at dynamic condition with time sequence control error less than 5 μs, effect energy density over 200 mJ/cm3 and transfer efficiency over 75%. Show more

Keywords: Pulsed source, high-precision discharge switch, time sequence control

DOI: 10.3233/JAE-170099

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 58, no. 1, pp. 15-25, 2018

Authors: Qian, Gaorong | Chen, Guoxiong | Wang, Gaofeng | Cheng, Yuhua

Article Type: Research Article

Abstract: Inserting metamaterials into the path of wireless power transfer (WPT) is an effective way to improve the power transfer efficiency (PTE) or extend the power transfer distance. The resonant frequency f 0 of the metamaterial is a critical parameter to distinguish the positive or negative permeability regions, which should be determined accurately. A new method to measure f 0 is developed and validated in theory and simulation. The paramagnetic region (where the effective permeability is positive) is a frequency band below f 0 , and is used as the operating region of WPT with insertion of the metamaterial. …According to experiments, the PTE is improved by comparison to the case without metamaterial. More interestingly, the PTE improvement effects at different operating regions are compared. It is shown that the region, where the forced-resonant frequency f RS is close to f 0 , has better effect than the other regions where f RS is lower or higher than f 0 . Show more

Keywords: Wireless power transfer, resonator, metamaterial

DOI: 10.3233/JAE-180035

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 58, no. 1, pp. 27-39, 2018

Authors: Zhang, Hailong | Liu, Jian | Tinghui, Zhang | Wang, Enrong | Rakheja, Subhash | Su, Chun-Yi

Article Type: Research Article

Abstract: A groundhook controlled semi-active suspension system equipped with magneto-rheological damper (MRD) is considered. Both the hysteresis of MRD and control discontinuity, the nonlinearity will greatly affect system stability of the vehicle. In this paper, the performance and nonlinear dynamic of semi-active suspension adopting modified groundhook is evaluated. The influence of frequency of harmonic excitation and parameter of modified groundhook controller on the nonlinear dynamics of the semi-active suspension system is investigated. More importantly, nonlinear dynamic analysis is carried out to study the semi-active suspension system, with the methods of bifurcation diagram, the Lyapunov exponent spectrum, time history, phase plane and …power spectrum in detail for the first time. Furtherly, electromagnetic interference (EMI) problems induced by chaotic motion are analyzed and discussed according to EN 55022 for another first time. It is indicated that both of periodic, quasi-periodic and chaotic motions exist. The system undergoes a complex nonlinear dynamical evolution with the excitation change. The coupling influence between chaos and EMI problems cannot be ignored in the further design of the semi-active controller. This work laid a theoretical foundation for EMI reduction and nonlinear control of the intelligent MR semi-active suspension. Show more

Keywords: Magneto-rheological suspension, modified groundhook, nonlinear dynamic, conducted electromagnetic interference

DOI: 10.3233/JAE-180003

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 58, no. 1, pp. 41-55, 2018

Authors: Li, Chong | Jichun, Xing | Lizhong, Xu | Sun, Lining

Article Type: Research Article

Abstract: To improve the robot joint’s control precision, a piezoelectric precision drive system is proposed. The proposed system has merits of fast response and compact size. Using continuous dynamic theory, the nonlinear coupled dynamic models and equations of the drive system are established. Applying Linz Ted-Poincaré Method, the approximate solutions of nonlinear solutions are solved. The magnitude-frequency characteristics are also analyzed. What’s more, the effects of nonlinear piezoelectric characteristic on the system’s dynamic performance are investigated yet. Results show that the jump phenomenon of vibration amplitude occurs in nonlinear resonance. Meanwhile, the nonlinear piezoelectric characteristic influences the dynamic performance of the …drive system obviously. These results can be used to predict the dynamic load of the piezoelectric precision drive system. Show more

Keywords: Nonlinear dynamic, magnitude-frequency characteristic, dynamic response, piezoelectric drive system

DOI: 10.3233/JAE-180027

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 58, no. 1, pp. 57-77, 2018

Authors: Hu, Jinchun | Du, Shengwu | Zhu, Yu | Chen, Longmin

Article Type: Research Article

Abstract: Employing the attached magnetic fields of permanent magnet synchronous planar motors for position sensing has been widely investigated, as it is low-cost and requires no complex setup compared to optical ways. An optimized position sensing method requiring only simple calculations to achieve precision planar 3-degree-of-freedom (DOF) position is proposed in this paper. By adding sensors and new decoupling operation, this optimized method complements the unmeasured position areas in the previous work, guaranteeing the ability to measure position in whole motion region. Simulation results verify the 3-DOF position sensing ability for global motion region and show that translational accuracy is 10 …μm-order and rotational accuracy is 0.1°-order under a conventional noise level. To demonstrate the feasibility, experiments have been conducted on a self-developed platform. Compared to commercial position devices, the results illustrate that the optimized method is able to measure planar 3-DOF position while its accuracy is limited by the imperfections of the magnetic field. X mean and standard deviation of −16.2 μm and 18.7 μm, and Y error mean and standard deviation of −11.3 μm and 16.4 μm are achieved in small-range comparison measurements. Show more

Keywords: Multi-DOF position measurement, sensor systems and applications, linear-Hall sensors, permanent magnet synchronous planar motors

DOI: 10.3233/JAE-160034

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 58, no. 1, pp. 79-99, 2018

Authors: Jing, Fu | Xiaoguang, Wang | Leilei, Hou | Ao, Pan

Article Type: Research Article

Abstract: The continuous development of magnetic bearing in areas of aerospace, military, turbine power generation and flywheel energy storage has raised higher requirement for the reliability of magnetic bearing system. However, the integrated armco iron structure adopted by traditional concentric axial redundant magnetic bearing stator causes more eddy current loss and temperature rise when working and is not reliable. For the purpose of reducing eddy current loss and improving the reliability of magnetic bearing, this paper proposes a laminated core type axial redundant magnetic bearing. The comparison of dual-ring axial redundant magnetic bearing and laminated core type axial redundant magnetic bearing …regarding their carrying capacity and temperature rise performance showed that the latter was better in an obvious way. Show more

Keywords: Axial magnetic bearing, laminated core, redundancy, temperature field, eddy current loss

DOI: 10.3233/JAE-180008

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 58, no. 1, pp. 101-120, 2018