A5069986645- Electric Motor Design and Analysis
- Magnetic Bearings and Levitation Dynamics
- Magnetic Properties and Applications
- Sensorless Control of Electric Motors
- Multilevel Inverters and Converters
- Magnetic Field Sensors Techniques
- Induction Heating and Inverter Technology
- Wireless Power Transfer Systems
- Non-Destructive Testing Techniques
- Tribology and Lubrication Engineering
- Iterative Learning Control Systems
- Electric Power Systems and Control
- Wind Turbine Control Systems
- Magnetic Properties of Alloys
- Control Systems in Engineering
- Microgrid Control and Optimization
- Neuroscience and Neuropharmacology Research
- Energy Harvesting in Wireless Networks
- Metallurgy and Material Forming
- Machine Fault Diagnosis Techniques
- Vibration and Dynamic Analysis
- Metal and Thin Film Mechanics
- Electric and Hybrid Vehicle Technologies
- Silicon Carbide Semiconductor Technologies
- Superconducting Materials and Applications
Zhejiang University
2016-2025
Nanjing University of Aeronautics and Astronautics
2018-2025
Taixing People's Hospital
2024
Zhejiang Lab
2020-2024
Norwegian University of Science and Technology
2024
Jiangsu Provincial Center for Disease Control and Prevention
2024
Bydgoszcz University of Science and Technology
2022
Shantou University Medical College
2012-2020
Shantou University
2012-2020
Chinese Academy of Sciences
2018
Application-specific integrated circuit (ASIC) ML4425 is often used for sensorless control of permanent-magnet (PM) brushless direct current (BLDC) motor drives. It integrates the terminal voltage unenergized winding that contains back electromotive force (EMF) information and uses a phase-locked loop (PLL) to determine proper commutation sequence BLDC motor. However, even without pulsewidth modulation, distorted by pulses due freewheel diode conduction. The pulses, which appear very wide in...
Small industrial three-phase induction motors (IMs) normally suffer from poor operational efficiency and power factor. This paper presents a high-performance line-start permanent magnet synchronous motor (LSPMSM) which is developed by simple modifications of an off-the-shelf small IM with minimized additional costs. Two-dimensional (2-D) dynamic finite element analysis (FEA) models are employed to assess the machine performances, validated comprehensive experimental results. The comparisons...
The permanent magnet (PM) flux-switching linear motor, which is developed from the PM rotary machine, possesses similar advantages such as high power density and simple structure. Furthermore, motor has a potential for mass production at low cost, since expensive coils magnets are both set on short mover. However, detent force induced by slot-effect end-effect deteriorates performance. Some methods to reduce effective in synchronous motors do not work motors, due their special This paper...
In this paper, application examples of high-speed electrical machines are presented, and the machine structures categorized. Key issues design control for permanent magnet reviewed, including bearings selection, rotor dynamics analysis design, stress protection, thermal electromagnetic losses reduction, sensorless strategies, as well comparison selection sine-wave square-wave drive modes. Some challenges also discussed, so that future studies could be focused.
This paper proposes a hybrid permanent-magnet memory motor. Using finite element method, the utility of AlNiCo and ferrite as low-coercive-force (LCF) magnets in motor is comparatively analyzed. The results demonstrate that positive magnetization difficult, while field-variation range with not sufficient, motor-power density characteristic LCF cannot be improved simultaneously. On other hand, q-axis current may cause irreversible demagnetization magnets, especially magnets. To solve...
The sensorless control of brushless machines by detecting the third harmonic back electromotive force is a relatively simple and potentially low-cost technique. However, its application has been reported only for dc motors operating under normal commutation. In this paper, utility method both ac motors, including operation in flux-weakening mode, demonstrated.
We propose a new topology for permanent-magnet flux-switching (PMFS) linear machine. describe its unique structure and compare it with the conventional PMFS Finite-element analysis (FEA) shows that proposed machine not only inherits advantages from machines, but also possesses many merits such as more efficient usage of magnets, high fault tolerance, easy assembly. These positive features make suitable applications. prototyped both machines verification found good agreement between FEA...
This paper investigates the torque characteristics of permanent-magnet flux switching (PMFS) machines with rotor step skewing. The cogging torque, ripple, and average output a PMFS machine common stator different pole widths numbers are first established using two-dimensional (2-D) finite element analysis (FEA). A cost-effective skewing technique is then proposed to reduce ripple two rotors. results have revealed that least number angle for optimal mitigation determined by harmonic contents...
Artificial synaptic devices that mimic the functions of biological synapses have drawn enormous interest because their potential in developing brain-inspired computing. Current studies are focusing on memristive which change conductance state is used to emulate behaviors. Here, a new type artificial based memtranstor demonstrated, fundamental circuit memelement addition memristor, memcapacitor, and meminductor. The transtance (presented by magnetoelectric voltage) memtranstors acting as...
Cogging torque in permanent magnet flux-switching machines (PMFSM) is relatively high compared with other types of PM motors, because their unique doubly salient structure. In this study, a new rotor teeth axial pairing (RTAP) technique proposed. As verified both 2-D and 3-D finite element analysis, as well laboratory tests, the RTAP can effectively reduce cogging torque, while its implementation more flexible than conventional circumferential (RTCP) technique. Furthermore, also applicable...
This paper presents a comprehensive analysis and comparison of air-cored axial-flux permanent-magnet machines with different types coil configurations. Although factor is particularly more sensitive to coil-band width pitch in than conventional slotted machines, remarkably no analytical equations exist. Here, new formulas are derived compare the two common concentrated-coil stator winding types. Then, respective factors for used determine torque characteristics and, from that, optimized...
Benchmark feature detection is critical in mobile robot automatic drilling systems for compensating accuracy and assembly errors aerospace manufacturing. System influenced by reference recognition, which often hindered material interference background noise. To address these issues, this paper proposes a method that uses 2D industrial camera image capture, applies deep learning initial target recognition positioning, then determines the extraction location based on recognition. The extracted...
The application of flux-observer-based sensorless control to permanent-magnet brushless AC motor drives is described. Current methods speed estimation are assessed, both theoretically and experimentally, an improved method, which combines the best features in derived from differential rotor position ratio electromotive force excitation flux linkage, proposed. Its performance verified experimentally.
In the paper, a 2-pole 3-phase high-speed PM BLDC motor with ratings of 3kW @ 150,000rpm is considered, magnets being SmCo. order to improve mechanical strength, rotor usually protected non-magnetic sleeve, such as carbon fiber sleeve which has very low electrical conductivity but poor thermal conductivity, or titanium alloy / stainless steel high and conductivity. The influence different retaining sleeves on loss analyzed FEM.
Line start permanent magnet synchronous motors (LSPMSM) may get demagnetized under some special conditions. The demagnetization is usually investigated with finite element analysis (FEA) by using the nominal properties of magnets. However, decay after magnets have suffered demagnetizing magnetic motive force (DMMF), causing spread area. Therefore, it proposed in this paper that iteration FEA should be taken, considering decaying properties. Moreover, four rotor configurations are proposed,...
Eddy currents might be significant in the rotor of a high speed permanent magnet brushless machine, especially when metal retaining sleeve is applied. Various methods have been used to reduce eddy currents. In this paper, simple method, by grooving sleeve, proposed, such that flowing path obscured and energy loss thus suppressed. Circumferential, axial comprehensive are comparatively studied, particularly on aspects reduction, mechanical strength, dynamic balance, manufacture process...
In this paper, a novel coaxial magnetic gear (MG) is proposed, in which both permanent magnet and consequent poles are employed on the inner outer rotors. The MG expected with improved torque transmission capability by increasing effective flux offering additional reluctance torque. Air-gap field distribution torque-angle characteristic of analyzed compared conventional MG, adopts dual surface-mounted To maximize density, several key design parameters investigated using finite-element...
This paper presents a new technique, notching the induction motor rotor core, so as to reduce electromagnetic noise by suppressing vibration due slot permeance harmonics. First, principle of such technique is presented along with theoretical analysis. Then, finite element method used calculate Maxwell force harmonics and spectra 5.5 kW 3000 r/m commercial modified motor. Finally, experimental results are given validate proposed testing acoustic two motors. It shown that has about 5 dB(A)...
The cytokine activin C is mainly expressed in small-diameter dorsal root ganglion (DRG) neurons and suppresses inflammatory pain. However, the effects of neuropathic pain remain elusive. Male rats wild-type TRPV1 knockout mice with peripheral nerve injury - sciatic axotomy spinal ligation rats; chronic constriction (CCI) provided models Ipsilateral lumbar (L)4-5 DRGs were assayed for expression. Chronic animals treated intrathecal or locally pre-administered vehicle. Nociceptive behaviours...
Abstract Background Bone mineral density (BMD) and prevalence of osteoporosis may differ between urban rural populations. This study aimed to investigate the differences in BMD characteristics populations Jiangsu, China. Methods A total 2,711 participants aged 20 years older were included cross-sectional study. Multistage stratified cluster random sampling was used as strategy. measured by method dual-energy x-ray absorptiometry (DXA). Data collected through questionnaires/interview. values...