Due to its low loss and high switching frequency, the silicon carbide metal oxide field effect transistors (SiC mosfets) are more suitable as devices in power inverter for electric vehicles. However, losses of would be dramatically increased with rise which result limitation using frequency performance SiC mosfet. In view this case, article systematically analyze distribution further optimize efficiency under frequency. It is demonstrated that linearly mainly caused by mosfet chips...

Data-efficient domain adaptation with only a few labelled data is desired for many robotic applications, e.g., in grasping detection, the inference skill learned from dataset not universal enough to directly apply on various other daily/industrial applications. This paper presents an approach enabling easy through novel detection network confidence-driven semi-supervised learning, where these two components deeply interact each other. The proposed specially provides prediction uncertainty...

A functional electrolyte containing propyl 4-methylbenzenesulfonate (PMBS) additive is developed to improve the performance of LiNi 0.8 Co 0.1 Mn O 2 (NCM811)/graphite pouch full cells, especially cycling lifetime under low temperature.

A novel direct torque control (DTC) method based on sliding-mode-control (SMC) strategy is proposed for permanent magnet synchronous motor (PMSM) which used in electric vehicles (EVs). In order to improve the dynamic response time and enhance robustness performance against external loading disturbances parameter’s variation, a kind of SMC-based controller speed are designed regulate angle increment respectively. The sliding mode with an asymmetric boundary layer reduce overshoot. Compared...

Based on the real-time model and platform, a dynamic hardware-in-the-loop (HIL) testing method for distributed powertrain of electric vehicle (EV) is proposed. Compared with static point testing, HIL test can provide more realistic working environment EV's (DEP) early development. The data motor's efficiency maneuver performance under work condition are authentic meaningful. Meanwhile, driver-vehicle-road (DVRRT) set up to emulate actual condition. speed-tracking control...

The power loss is an important factor to be considered in the design stage of inverter. However, there are a few literatures systematically analyze losses inverter, especially for with Silicon Carbide Metallic Oxide semiconductor field effect transistors (SiC MOSFET). This paper investigates inverter based on SiC MOSFETs by considering various factors such as junction temperature, switching frequency, dead-time, PWM modulate mode, control strategies and operation conditions motor. It can...

Snapshot hyperspectral imaging technology is increasingly used in agricultural product monitoring. In this study, we present a 9× local zoom snapshot system. Using commercial spectral sensors with spectrally resolved detector arrays, achieved 14 wavelength bands and bandwidth of 10–15 nm. An experimental demonstration was performed by acquiring spatial information about the fruit Drosophila. The results show that system can identify Drosophila distinguish well between different types fruits....

The classic Offner spectrometer has the advantages of having a simple structure, light weight, and high imaging quality. It is easily to achieve fixed spectral resolution but cannot meet usage requirements. Therefore, we present practical method for designing with variable resolution. Multiple off-axis convex (OAC) gratings are used replace grating in spectrometer. We derive principle through ray tracing establish an optimization process basic parameters multiple OAC gratings. To demonstrate...

The fault diagnosis and health management of motors are the key technology that needs to be resolved in future with development electric vehicles. drive usually working under nonstationary conditions. Moreover, mechanical is most common type among motor types. Therefore, developing detection method variable speed conditions would great value improve accuracy vehicle motors. This paper deals mechanism bearing fault, rotor eccentricity their compound permanent magnet synchronous purpose this...

Space vector pulse width modulation (SVPWM) is used in motor control because of its high dynamic response and flexible control. Maximum torque per ampere (MTPA) strategy has become the most commonly choice for internal permanent magnet synchronous (IPMSM). However, complicated coordinate transformations are required usual SVPWM algorithm performance MTPA can be affected by parameters variation. This paper proposes a voltage directional (VVDC) method based on strategy. The inverse Park...

AlxGa1−xN nanowires are the key materials for next-generation ultraviolet (UV) detectors. However, such devices have a low quantum efficiency caused by introduction of defects and impurities throughout preparation process nanowires. Herein, effects different interstitial vacancy on electronic structure Al0.5Ga0.5N investigated using density functional theory calculations. Our results successfully discovered that only formation an N defect is thermally stable. In addition, makes exhibit...

Abstract Thermal stress is one of the most important factors leading to power module failure. Under load condition high current with low fundamental frequency or largely changed current, it would cause junction temperature swing amplitude (JTSA) chips, which could accelerate failure module. To address this issue, paper proposes a dual fuzzy logic controller‐based active thermal control (ATC) strategy reduce JTSA chips in cases variable profiles. Two controllers are designed by adjusting...

As a power hardware-in-the-loop (PHIL) technology, the power-stage motor emulator (ME) can be employed for port characteristics emulation of motors. Meanwhile, ripple current reproduction is one key technologies achieving high precision characteristics. Commonly, requirement hardware topology and modulation strategy with rapid response low harmonics are main challenges. Aiming to obtain current, ME scheme dual-branch parallel proposed in this paper, which equivalent switching frequency...

The traditional measurement method was inaccurate to evaluate the motor controller efficiency, which efficiency value could be more than 100% in practical testing experiments. To deal with this issue, an improved electrical for is proposed paper, established by analyzing power loss distribution and phase currents of controller. It demonstrated that SiC MOSFET chips are main devices controller, accounting 93.1% total loss. accuracy compared simulation. shows test error obtained fluctuates on...

A design process for brushless doubly-fed induction machine (BDFIM) is presented in this paper. The approach employs the magnetic circuit model (MCM) combining an equivalent (ECM). MCM first accurately constructed BDFIM. Through model, dimension of BDFIM can be rapidly calculated. saturation taken into account MCM, and parameters, such as flux density are calculated without time-consuming finite element analysis (FEA). graphical user interface developed better friendliness. linkage obtained...

resent research evaluates three typical road load algorithms, like PI algorithm (PIA), feed forward (FFA) and inverse model (IMA), for electric powertrain testing. Models of vehicle, driver test bench are established in MATLAB/Simulink environment, which has structural consistency with real motor-in-the-loop bench. A novel vehicle state observation is used to reflect the effect loading inertia emulation. To evaluate simulation, each validated off-line simulation HIL The results show FFA IMA...

Data-efficient domain adaptation with only a few labelled data is desired for many robotic applications, e.g., in grasping detection, the inference skill learned from dataset not universal enough to directly apply on various other daily/industrial applications. This paper presents an approach enabling easy through novel detection network confidence-driven semi-supervised learning, where these two components deeply interact each other. The proposed specially provides prediction uncertainty...

In general, the reflectors of off-axis three-mirror system have large apertures and differences in surface shape, which means it is difficult to use one set null compensators test all aspheric mirrors because limitation dynamic range testing equipment. this paper, we propose a shape method that combines refractive-zoom lens group Spatial Light Modulator (SLM) as compensator surfaces system. The proposed verified by simulating process three system, with consideration fabrication alignment...

In order to solve the problems of limited clear viewing range and small field angle existing night vision equipment, a large numerical aperture zoom objective is designed combined with optical imaging technology. The uses lens curvature on first surface achieve view detection. aspheric added improve quality system reduce weight system, so that users can have better user experience when using lens. operating band 436nm-656nm, focus 4.5mm-40mm, maximum reach 74°. Finally, through simulation...