The five-level active neutral-point (NP)-clamped (ANPC) converter is a newly emerging topology which can overcome the drawbacks of traditional NP-clamped and flying-capacitor multilevel converters. This paper presents comprehensive theoretical analysis NP potential balancing issue demonstrates that be naturally balanced under ideal steady conditions. An method based on zero-sequence voltage injection presented. By calculating average currents all key voltages, most appropriate selected to...

ABSTRACT The traditional distributed control system of trains faces challenges such as weak functional coordination, limited information sharing, significant response delays, and low speed accuracy, thereby impeding the efficient energy‐saving operation trains. This paper proposes a novel integrated architecture approach for trains, facilitating rapid interaction reuse through integration data computations from onboard signals, traction, braking, network subsystems. Initially, sophisticated...

The zero-sequence current (ZSC) of open-end winding permanent magnet synchronous motor (OW-PMSM) with common dc bus mainly comes from voltage (ZSV) and third harmonic back electromotive force, so the ZSV levels vectors in model predictive control (MPC) need to be considered suppress ZSC. Different conventional MPC methods for OW-PMSM, which usually select optimal vector under αβ0 coordinate system, this article proposes a three-dimension space (TDSV) based method ABC three-phase system...

Dual-inverter fed open-end winding permanent magnet synchronous motor (OW-PMSM) drive topology can extend the speed range under limited dc bus voltage, but it suffers from zero-sequence current (ZSC) problem when with common configuration. Predictive control (PCC) is a potential high-performance method for electric drive. However, PCC algorithm dual-inverter system may bring huge computational burden because of more space vectors (SVs) to traverse. In order improve steady-state performance...

The open-end winding permanent magnet synchronous motor (OW-PMSM) with common DC bus configuration provides a path for zero-sequence current (ZSC). Apart from the voltage (ZSV) generated by inverters modulation, ZSC also comes third harmonic back-EMF. However, back-EMF contains position information of rotor, which can be extracted an appropriate strategy to achieve sensorless drive. In order drive and suppression simultaneously, this paper proposes novel general-integral extended state...

The additional eddy loss in the solid strand of formed coil is an important part windings copper superpower direct drive permanent magnetic synchronous motor (PMSM). This produces due to uneven leakage field stator slot region. traditional transposition technology difficultly applied multi-turn and less-strand coil, because limited fill factor. Therefore, aiming reduce loss, this paper proposes a new end it was used 2 MW low-speed high-torque multi-unit PMSM prototype. inhibitory excellent...

A novel compound-structure transverse-flux permanent-magnet synchronous machine (CS-TFPMSM) is proposed in this paper, which used hybrid electric vehicles (HEVs) to fulfill the power-split function. The key component of CS-TFPMSM a brushless dual rotor (TFDRM). TFDRM originates from machines, and capable speed adjustment between without using any brushes. structure principle are described. torque equations deduced, different those traditional machines. Based on investigation, tends have high...

As position and speed sensor, the axial flux variable-reluctance resolver with sinusoidal rotor(AFVRSR) needs to possess high accuracy of measurement. However, relative locations stator rotor sometimes appear some deviations in practical work. The eccentricities caused by assembly factors could produce serious electrical error. This paper carries on theoretical analysis finite element when AFVRSR are provided different eccentricities. Zero error, amplitude error function were measured under...

This paper studies the single on-ramp in a totally asymmetric simple exclusion processes (TASEPs). In our model, particles can only attach irreversibly with rate q to bulk site k + 1, which is far away from boundaries. The model investigated under random sequential update and open boundary conditions by using Monte Carlo simulations mean-field calculations. case of hopping p = when attachment fixed < 0.5, there are five phases system, while > system includes four LD/LD phase vanishes.

The high torque peaks commonly found in single-phase brushless dc motors can be compressed by different driving methods, which are proposed and studied based on finite-element analysis (FEA). It is concluded that one dead-zone added into the signals to improve current waveforms envelope. test results show noise level performances greatly improved when proper dead zone implemented

This study conducts thermal aging treatment to the effect of on PD degradation process oil-paper insulation. The partial discharge inception voltages, extinction carbon mark, and microscopic morphology samples are analyzed. results show that does not reduce voltages but can make spark produced in more difficult extinguish. At initial stage, has little development normal direction samples, while later stages, begins appear; reduces insulation performance between layers oil impregnated paper...

Free-piston linear generator (FPLG), as a novel energy converter, has attracted wide attention due to its unique operating characteristics. However, the high-precision and robust tracking of dead center positions in presence frequent combustion variation is still tricky problem. In this respect, article, we present trajectory-regulation-based segmented control (TRBSC) actively electric machine (LEM) FP LG. The target stroke divided into high-speed zone low-speed zone, where active input...

The long-term operation of dry-type transformer bushings at high temperatures can impact the performance their primary insulation material. This article presents an experimental study effect thermal aging time on electrical treeing in epoxy resin-impregnated paper. results show that pattern along middle path electric field and interlayer creepage average direction are closely related to time. Under 150 °C, tree-starting voltage paper tends increase decrease as increases. An analysis...

In this paper, the author introduces a new rotor position detecting method for sensorless control of brushless DC motor (BLDCM). It applies circuit to get fundamental wave from three phase terminal voltage. A special switched capacitor filter is designed achieve constant delay 90 electrical degrees. Since lag not related speed rotor, it needn't compensation. The filtered signal can be converted six commutation signals BLDCM just through zero-crossing comparator and decoder, so detection...

A new kind of a couple-pole axial variable reluctance resolver is introduced in this paper, which compact, small size and has huge anti-interference ability, etc. Being special structure, the type strong ability than any other kinds resolvers. The principle different from traditional resolvers because changed by varying coupling area between rotor stator. 3D FEM time stepping method used article to analyze character EMF produced two signal windings. At same time, every part magnetic...

Nowadays all-digital resolver-to-digital conversion is popularly invested for space-limited applications. However time delay inevitable in demodulation part when frequency shifting algorithm used. Furthermore, the angle calculation result affected by delay. So synchronous analyzed this paper to void The demodulated sine and cosine signals always exist with amplitude quadrature errors. In order eliminate influence of these two errors, double reference frame-based phase-locked loop (DSRF-PLL)...

Free-piston linear generators (FPLGs) without a crank mechanism are promising to be used in hybrid vehicles due their unique operation characteristics. However, the FPLG currently still faces challenges start-up and piston control. In this article, process of analyzed deeply improved thrust control strategies for electric machine presented accordingly. First, that vibration center shifts under general constant resonance starting method is revealed, considering asymmetric potential energy...

Motor rotor magnetic bridges operate under multiple physical field loads, such as electromagnetic force, temperature, and centrifugal force. These loads can cause fatigue aging failure of the bridges, especially when is operating continuously at high speeds temperatures. Therefore, analysis accelerated test cycle development a major aspect their reliability evaluation. This paper studies multi-physics load transfer characteristics establishes bridge model. A simulation conducted from field,...

The parameter of the Axial-Flux resolver is difficult to be calculated for its complete magnetic structure. By using analytical method, conclusion got that resistance reluctance varied by changing electro-magnetic coupling area. At same time, selecting appropriate shape inclined ring rotor, output sine and cosine signal EMF optimized. In order analyze axial flux through stator 3D transient FEM used. character in windings at time. result analysis coinciding with supposing method well this...

In order to enhance interference immunity and reduce the breakage of rotating shafts (rotors) which happens frequently especially in submersible permanent magnet synchronous motor (PMSM) applications, first a typical rotor structure is established serving as comparative object, then two improved schemes with optimal mechanical are proposed. Rotor strength, stiffness, influence unilateral magnetic pull on deflection calculated analytically. The modal simulation, stress field simulation...

The reluctance changing principle of resolver is divided into two kinds: one varying through coupling area and the other air gap. mechanical eccentricity makes much more influence on precision pair pole resolver. In this article, axial flux with new magnetic structure put forward, which has compensating character inside its side prototype both exciting windings signal in stator, are vertical to each other. There no winding rotor inclined ring set it. EMF got using FEM. At same time, 4-pole...