Simultaneous wireless charging of multiple devices is a unique advantage power transfer (WPT). Meanwhile, the multiple-receiver configuration makes it more challenging to analyze and optimize operation system. This paper aims at providing general analysis on WPT systems compensation for influence cross coupling. A two-receiver system first investigated as an example. It shows that theoretically by having derived optimal load reactances, important characteristics can be preserved, such...

The misalignment and displacement of inductively coupled coils in a wireless power transfer system (WPT) can degrade the efficiency limit amount that be transferred. Coil leads primary coil driver to operate an untuned state which causes nonoptimum switching operation results increase losses. This paper presents novel method electronically tune Class-E inverter used as inductive WPT minimize detrimental effects between may occur during operation. tuning uses current-controlled inductors...

High-torque and low-speed electrical drives are often employed for applications where mechanical gearing cannot be accommodated. On the other hand, permanent-magnet (PM) gear has drawn significant attention from both academies industries due to conspicuous merits, such as reduced acoustic noise, maintenance free, improved reliability, precise peak torque transmission capability, inherent overload protection. In this paper, a magnetic-geared PM brushless motor is presented. It novel...

The sideband current harmonic components would inhere in permanent-magnet (PM) synchronous machine systems driven by a voltage-source inverter with space vector pulsewidth modulation (SVPWM). However, these harmonics could potentially deteriorate the overall performance of drive system increasing resultant losses, torque ripple, and electromagnetic acoustic noises. main voltages currents PM SVPWM technique, are analytically derived expressed both stator rotor frame. experimental results...

This paper proposes a novel permanent magnet flux switching (PMFS) machine with an outer-rotor configuration for in-wheel light traction applications.The geometric topology of the PMFS is introduced and analytical sizing equations are derived to determine main design parameters machine.Two-dimensional (2-D) Finite element analysis (FEA) models developed investigate optimize performance.Furthermore, weakening capability analyzed further improved by segmental magnets iron bridges.The...

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...

This paper investigates the performance of Class E inverters used in wireless power transfer applications based on resonant inductive coupling. The variations load and distance between coils cause to operate under nonoptimal switching conditions, which result inefficient operation can lead permanent damage its transistor. Therefore, a novel approach tune electronically is proposed. tuning method relies saturable reactors ensure that inverter operates optimal conditions regardless coils. In...

This paper investigates the inverter nonlinearities in a drive system based on silicon carbide metal-oxide-semiconductor field-effect transistor (SiC-mosfets) and compares its performance with that of an equivalent insulated-gate bipolar (Si-IGBT) system. Initially, novel comprehensive analytical model voltage distortion is developed. Not only drops, dead time, output capacitance, but also switching delay times overshoot power devices are taken into account model. Such yields more accurate...

This article presents a review to provide up-to-date research findings on concentrated photovoltaic (CPV) cooling, explore the key challenges and opportunities, discuss limitations. In addition, it provides vision of possible future trend glimpse promising novel approach CPV cooling based pulsating flow, in contrast existing methods. Non-concentrated photovoltaics (PV) have modest efficiency up around 20% because they utilise only narrow spectrum solar irradiation for electricity conversion....

In direct-drive electric propulsion systems, where there is no reduction gear to minimize and absorb the adverse effects of cogging torque generated by permanent-magnet (PM) machine, minimization generation particular importance. this paper, a novel axial pole-pairing method proposed in special three-phase outer-rotor PM brushless which uses uneven stator poles enhance back electromotive force (EMF). Analytical formulas machine's are first derived. The new technique compared with...

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...

Resonant converters used as coil drivers in inductive links generally operate efficiently at optimum switching conditions for constant load values and ranges. Changes range can shift the operation of driver to a nonoptimum state which results higher losses reduced output power levels. This paper presents method adapt variations Class E inverter wireless transfer (WPT) system based on coupling. It is shown that by controlling duty cycle inverter's switch value its dc-feed inductance, be tuned...

This paper investigates a material-efficient axial pole pairing method for torque ripple reduction in direct-drive outer-rotor surface-mounted permanent-magnet synchronous machine. The effects of the magnet arc width on characteristics machine are first established by both analytical and 2-D finite element approaches. Furthermore, effectiveness technique mitigating cogging torque, back electromotive force harmonics, overall quality is comprehensively examined. Finally, 3-D analysis...

The operation of traditional rectifiers such as halfwave and bridge in wireless power transfer applications may be inefficient can reduce the amount that is delivered to a load.An alternative use Class E resonant which are known operate efficiently at high frequencies large input voltages.Class have near sinusoidal current leads an improved overall system performance increased efficiency, especially transmitting coil driver.This paper first investigate systems based on inductive coupling.A...

Permanent-magnet flux-switching (PMFS) machine offers high torque density, impressive flux-weakening capability and mechanical ruggedness because of its distinctive configuration, is potentially suitable for the application in automotive integrated-starter-generators (ISGs). However, PMFS generally exhibits higher cogging compared with other machines commonly used ISGs. Minimisation utility ISGs therefore particular importance. Four rotor topologies are proposed here as cost-effective means...

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...

This paper investigates the cogging torque and ripple features of a permanent-magnet flux-switching integrated starter generator. The effects rotor pole arc width on torque, ripple, output are first established using finite-element analysis (FEA). Three reduction techniques based optimization three different configurations, namely, uniform, step skewed, axial pairing, then proposed. characteristics each configuration at varying load currents phase angles studied in detail. A prototype...

The sideband current harmonics, as parasitic characteristics in permanent-magnet synchronous machine (PMSM) drives with space vector pulsewidth modulation technique, will increase the corresponding electromagnetic loss, torque ripple, vibration, and acoustic noises. Therefore, fast yet accurate evaluation of resultant harmonic components is particular importance during design stage drive system. However, inevitable magnetic saturation cross-coupling effects interior PMSM would have a...

This paper provides a comprehensive investigation into the electromagnetic vibration associated with sideband harmonic components introduced by space vector pulse width modulation applied in integral-slot permanent magnet synchronous machine (PMSM) drives. The critical magnet, armature reaction, and magnetic field components, which are primary causes for PMSMs, identified. analytical derivations of carried out, amplitudes frequencies resultant radial force obtained. Furthermore, proposed...

This paper addresses the need for sizing of rotors multirotor vehicle applications such as personal air transport, delivery, surveillance, and photography. A methodology propeller motor selection is developed augmented with flight time estimation capabilities. Being multirotor-specific it makes use platform’s simplicity to rapidly provide a set off-the-shelf components ready be used in vehicle. Use operating points comparison process fast, precise, tailored specific application. The method...

A novel nondissipative two-stage equalization circuit topology based on the traditional buck-boost is proposed to achieve balancing of series-connected lithium-ion battery packs with higher efficiency and less cost, considering background international energy issues development trend balancing. The achieves high efficient without adding additional devices. Detailed illustration presented topology, operation principles control approaches are described visualized figures in this article. Then,...

The electromagnetic radial force acting on the stator inner periphery will induce vibration and acoustic noise in permanent magnet synchronous machines (PMSMs). components are transmitted through teeth to yoke introduce deformations. influence of tooth structure can be considered as an equivalent mechanical modulation effect these components. As a result, high-order modulated potentially result eminent low-mode vibration. In this article, analytical model is developed offer intuitive...