Novel synchronous machines with doubly salient structure and permanent magnets (PMs) in stator yoke have been developed this paper. The is constituted by T-shaped lamination segments sandwiched circumferentially magnetized PMs alternate polarity, while the rotor identical to that of switched reluctance (SRMs). pole number multiples six, which poles a unit machine. Similar variable flux (VFRMs), numbers novel are not restricted those SRMs. When differ one (or multiples), show sinusoidal...

In this paper, the operational envelops and efficiency maps of an electrically excited (EE) machine with/without employing flux weakening control via armature current and/or field excitation regulating are obtained comprehensively compared for electric vehicle applications. It shows that even in EE machines, only using but without control, maximum power at high speed is not constant inversely proportional to speed. Only by operation high-speed region can be achieved while greatly extended....

This paper focuses on no-insulation (NI) HTS pancake coils with iron core for superconducting dc induction heaters. A coil without turn-to-turn insulation and its conventional counterpart are wound YBCO-coated tapes. An is built a laboratory-scale heater. The electromagnetic characteristics of the two studied focusing charging sudden-discharging processes at 77 K. Three variables measured, i.e., current, terminal voltage, magnetic field induced. results show that NI incurs significant delay...

This paper is addressed to proving a new Carleman estimate for stochastic parabolic equations. Compared the existing in this respect (see [S. Tang and X. Zhang, SIAM J. Control Optim. 48 (2009) 2191–2216.], Thm. 5.2), one extra gradient term involving that eliminated. Also, our improved established by virtue of known deterministic As its application, we prove existence insensitizing controls backward usual, control problem can be reduced partial controllability suitable cascade system...

This paper proposes an integrated field and armature current control strategy for variable flux reluctance machine (VFRM) with open winding topology. By using inverter, the currents can be injected into a single coil as sinusoidal biased by dc offset, rather than separated windings. With this method, reduce copper loss to half extend operating speed range owing reduction of resistance. Besides, voltage utilisation ratio also increased inverter. The scheme is performed in synchronous...

An improved target field method is proposed for the cylindrical coil design to meet constraint of limited volume. It realizes uniform magnetic by predetermining configuration and optimizing coordinate positions points. Compared with conventional methods, this current density distribution divided into two symmetric subregions solve problem reserving a gap in center setting light-passing holes. Therefore, more applicable miniature atomic devices optical paths. Moreover, overall performance can...

A novel switched flux permanent magnet machine (SFPMM) with both normal NdFeB and low coercive force (LCF) magnets has been developed in this paper. Outside a conventional SFPMM, the LCF are mounted on back of every U‐shaped stator lamination segment parallel magnetisation direction alternative polarities. ring yoke is placed around all magnets, while extra coils wound each them. By injecting different directions current pulses into coils, polarities can be rewritten order to enhance or...

To diagnose breast cancer (BCa), the number of mitotic cells present in tissue sections is an important parameter to examine and grade biopsy specimen. The differentiation from non-mitotic histopathological images a crucial step for automatical mitosis detection. This work aims at improving accuracy classification by characterizing objects interest (tissue cells) wavelet based multi-resolution representations that better capture statistical features having discrimination. A dual-tree complex...

Varieties of loss should be optimized to as little possible for the stability permanent magnet in a high-speed magnetic levitated synchronous motor (HSMLPMSM) rotor and ensure high efficiency low temperature motor. First, this paper analyzes distribution motor, whose power rated speed are 100 kW 32 000 r/min, by calculation method. Then, separation losses HSMLPMSM is implemented based on drag system without torque meter accounting its particularity high-power level. In all kinds losses, core...

To control the high-frequency acoustic noise of permanent magnet synchronous machine (PMSM) with space vector pulse-width modulation (SVPWM), an investigation into mechanism sideband vibro-acoustics is presented in this study. Especially, relationship developed between electromagnetic components and mechanical vibro-acoustics, which paves fundamentals to reduce at sources. Firstly, analytical derivations voltage current harmonics are expressed, while magnetic armature reaction also discussed...

This paper presents an investigation into sideband vibro-acoustics suppression of the permanent magnet synchronous motor (PMSM), associated with several periodic signal-based dithering modulations. Mathematical derivations four typical schemes are deduced power spectral density (PSD) method. The individual modulation parameters, such as bandwidth and ratio, determined values to minimize vibro-acoustics. frequency distributions components discussed by analytical derivations. relationship...

High-frequency vibro-acoustics, introduced by voltage source inverter (VSI) and control strategies, are the critical features affecting noise, vibration harshness (NVH) performances of electric vehicles (EVs). In this paper, a comprehensive evaluation comparison into sideband current harmonics high-frequency vibro-acoustic responses has been studied with different strategies in study case permanent magnet synchronous motor (PMSM). At first, principles implementation continuous discontinuous...

The magnetic bearing’s (MB) performance is determined by its electromagnetic and mechanical parameters, which should be optimized to meet the working requirements. Many optimal methods of MB have been only focused on a single objective, may limited small amount aspects, while other important ones are ignored. A multiobjective optimization (MOO) model design considered for better comprehensive property proposed in this paper. After modeling equivalent circuit whose simplification has...

Temperature rise caused by losses is a key issue for high-speed machine. This paper deals with loss calculation and thermal analysis of magnetically suspended PM machine (MSPMM) an actual power 33 kW rotation speed 55 332 r/min. The temperature distribution based on the finite element method obtained accounting various losses, which consist air friction copper iron radial magnetic bearing, combined radial/axial permanent magnet (PMM). A back-to-back test setup two MSPMM fabricated verifying...

This paper is addressed to a study of the null/approximate controllability for class coupled systems governed by two linear forward stochastic parabolic equations with fractional order spatial differential operators. Our method based on Lebeau--Robbiano strategy. The key establish suitable observability estimate some backward terminal states in finite dimensional spaces. Compared deterministic systems, coupling appearing diffusion terms case introduces quite interesting new phenomena. We...

The three degree‐of‐freedom (3‐DOF) hybrid magnetic bearing (HMB) sets radial, axial at one entirety, which can effectively save the installation space. Here, a 3‐DOF HMB is designed, optimised, and tested for 30 kW 60,000 r/min high‐speed motor system. radial capacity analysed by equivalent circuit method dimensional finite element model (FEM) of initial established. Then, capacity, current‐stiffness, displacement‐stiffness are selected as optimised design target using chaos particle swarm...

The magnetic levitation reaction flywheel (MLRW) is a novel actuator of spacecraft attitude control because its significant advantages, including lack friction and active suppression vibration. However, in vacuum environment, the poor heat dissipation conditions make it more sensitive to various losses rises temperature. Therefore, increasing temperature key issue for components used space. In this study, three kinds heat-generating areas MLRW, namely, passive bearing (PMB), (AMB) brushless...

High-fidelity computational fluid dynamics simulations play an essential role in predicting complex aerodynamic flow fields, but their employment are hindered due to the high burdens involving fine spatial discretizations. While recent data-driven methods offer a promising avenue for performance improvements, they often face challenges related excessive reliance on labeled data and insufficient accuracy. Consequently, we propose novel hybrid model, which integrates deep learning model into...

In this study, a mechanical flux adjusting technique for the switched permanent magnet (SFPM) machines is presented to improve flux-weakening capability by extending speed range. The ferromagnetic material pieces, that is, adjusters (FAs), are located on outside surface of stator poles equipped with (PM) and used weaken PM via short-circuit. To explore most suitable machine topologies such technique, performance conventional SFPM different stator/rotor pole combinations, multi-tooth, E-core...

This paper is devoted to a study of controllability and observability problems for some stochastic coupled linear parabolic systems only by one control through an observer, respectively. In order get null result, the Lebeau-Robbiano technique adopted. The key point prove inequality certain backward system iteration, when terminal values belong finite dimensional space. Different from deterministic systems, Kalman-type rank conditions do not hold any more. Meanwhile, based on Carleman...