The flux-switching permanent-magnet double-rotor machine (FSPM-DRM) used for hybrid electric vehicles has attracted considerable attention due to the compact structure and high torque density. Compared with conventional machine, FSPM-DRM suffers from more severe thermal problems in its inner rotor. This paper aims make an accurate prediction of performances temperature distributions FSPM-DRM. First, eddy current loss windings improved analytical method is discussed results are validated by...

In order to improve the dynamic performance of sensorless permanent magnet synchronous motor drive system, modified pulsating high frequency voltage injection method is proposed. Firstly, second generalized integrator can be used extract signal instead band-pass filters. The specific harmonic elimination unit applied obtain rotor position error avoid using low-pass filter. Therefore, system improved. addition, parameter easier adjust than traditional methods with filters and Finally,...

Abstract This study investigates how N2/O2 mixture shielding gas influences the interaction between a helium atmospheric pressure plasma jet (APPJ) and target surface using 2D axisymmetric fluid model. The ratio of is set at 1/0 (pure N2), 0.79/0.21, 0.5/0.5 or 0/1 O2) in results reveal that distribution electron density along radial axis within ionization wave (IW) influenced by gas. When pure N2, remains relatively uniform IW, maintaining higher level near center (defined as ‘solid...

<div class="section abstract"><div class="htmlview paragraph">Hydrogen fuel cell is one of paths to achieve carbon neutrality transportation. In the last two decades, significant improvements have been made in compactness, efficiency and durability systems. For heavy duty truck applications, a life span similar diesel engines required. As critical component system, air compressors play an important role meet systems’ high requirements. this paper, holistic approach has taken...

Both torque winding magnetic field and suspension force induce currents in the rotor conventional bearingless induction motors (BIMs). Owing to induced of winding, air gap is affected, which results amplitude phase error radial forces. To overcome such drawbacks, a novel BIM with fixed‐pole proposed, called (BFPRI) motor. First, structure BFPRI motor designed introduced. Second, mathematical models forces are deduced. Third, corresponding electromagnetic characteristics, including currents,...

A fast and precise lumped-parameter thermal network (LPTN) model is presented for a flux-switching permanent-magnet double-rotor machine used hybrid electric vehicles (HEVs), which has attracted attention due to the compact structure. The three-dimensional (3-D) LPTN provides steady-state solution derive temperatures at different parts of machine, in power losses various working conditions are as heat sources calculating operational modes. In studies, transformation an irregular slot...

The traditional bearingless permanent magnet synchronous motor has complex decoupling control problems. To overcome the drawbacks above, a novel hybrid type (HPMTBM) is proposed in this paper, which integrated merits of excitation and magnetic bearings. main advantages HPMTBM are simple mechanism low power consumption. First, principle theoretical background introduced. Then, mathematical models radial suspension force torque established using Maxwell stress tensor method, air-gap fields,...

A novel triple-path PLL (TPPLL) is presented to compensate the VCO frequency drift caused by large temperature variations meanwhile maintaining a stable bandwidth and good jitter performance. The proposed architecture splits tuning loop into three paths as proportional, integral, compensation (TC) path, respectively. feed-forward TC path with gain but small adopted realize for in closed-loop manner without affecting high-frequency performance of VCO. fixed control voltage on proportional...

The gradually increased penetration of photovoltaic (PV) power into electric systems brings an urgent requirement for accurate and stable PV forecasting methods. existing methods are built to explore the function between weather data generation, which ignore uncertainty historical power. To manage in process, a novel ensemble method, named evidential extreme learning machine (EELM) algorithm, deterministic probabilistic based on (ELM) regression, is proposed this paper. EELM algorithm builds...

In this paper, an outer-rotor-permanent-magnet flux-switching (ORPM-FS) machine is proposed. It not only inherits the traditional permanent-magnets (FSPM's) principle and high torque density, but also overcomes FSPM's magnetic saturation adds slot area, thus producing favorable output capability at rated load overload condition. By means of finite element method, ORPM-FS optimized through multi-level process for multi-objectives: basic variables optimization low ripple, pitch coefficient...

To solve the coupling between torque and suspension force in conventional bearingless switched reluctance motor (BSRM) improve performances, novel hybrid stator type (HSTBSRM) with double-slice structures is proposed. The magnetic circuit completely independent of circuit, natural decoupling achieved. First, structure, circuits, suspension, rotation mechanism are analyzed. mathematical models radial forces deduced detail. According to maximum bearing capacity, main parameters part designed....

The sensor-less control system of PMSM is complicated, and it great significance to carry out accurate mathematical modeling simulation analysis. small in size, high efficiency, low noise, so very popular AC motor applications. They have been widely used various electrical appliances such as machine tools, robots, household appliances. In order reduce the high-frequency chatter strategy permanent magnet synchronous motors, a method based on improved SMO proposed. back-EMF component static...

Direct torque control (DTC) is a method to machine with utilizing and flux of motor controlled. The current ripples are occurred in the conventional DTC. Reason undesired low number voltage vectors applied controlled by DTC technique. Base on analysis basic permanent magnet synchronous (PMSM), modified based error vector algorithm (FEVA-DTC) proposed reduce this study. Simulation results from FEVA-DTC presented compared. Result shows that decreased FEVA-DTC.

The permanent magnets can be damaged for the tremendous centrifugal stress when magnet rotor rotates in high-speed. In this paper, mechanical strength of high-speed was researched. Stability operation conditions surface-mounted were analyzed. mathematical model between shrink range bandage and maximum operating speed concluded. strengths two kinds rotors calculated compared using contact finite element method. For buried type rotor, equivalent ring method put forward to calculate its limit....

In order to reduce the axial length and increase critical speed of small magnetic suspension drive system, a new slice hybrid bearing (SHMB) with two radial air-gaps is proposed. The structure mechanism SHMB introduced, then mathematical models force are deduced using equivalent circuit method. proved. forces calculated by finite element experimental prototype finally designed constructed. stable rotor realized, measured. results calculation measurement verify correctness models.

In order to approximately obtain sinusoidal air-gap magnetic field and get larger radial levitation force of the bearingless permanent magnet synchronous motor (BPMSM), a novel BPMSM with Halbach magnetized rotor is proposed. Firstly, suspension rotation mechanisms are introduced. The control mechanism producing in single direction arbitrary analyzed detail. mathematical models given. Secondly, comparative research on BPMSMs parallel carried out. field, back electromotive (EMF), force,...

To make full use of the space and improve radial bearing capacity, a new two-degree freedom (DOF) four-pole hybrid magnetic (RHMB) is researched in this article. This RHMB characterized by that independent circuit adopted, suspension winding installed axial space. First, structure working principle are introduced. Second, mathematical models established main parameters prototype designed. The 3-D finite-element analysis carried out to analyze calculate circuit, mechanism, force-current...

Based on the analysis of permanent magnet synchronous motor (PMSM) mathematical model, a PMSM rotor field-oriented double closed-loop vector control system is constructed. Aiming at defects slow speed response, large overshoot, severe torque ripple, and poor anti-disturbance ability in traditional PI controller used loop, fuzzy parameter self-tuning proposed. The can set two parameters proportional integral online according to rules. simulation model built based Matlab/Simulink. results show...