A5020823966- Sensorless Control of Electric Motors
- Electric Motor Design and Analysis
- Laser Design and Applications
- Magnetic Bearings and Levitation Dynamics
- Solid State Laser Technologies
- Advanced Fiber Laser Technologies
- Healthcare and Environmental Waste Management
- Photochemistry and Electron Transfer Studies
- Magnetic Field Sensors Techniques
- Electrocatalysts for Energy Conversion
- Sustainable Development and Environmental Policy
- Multilevel Inverters and Converters
- Fuel Cells and Related Materials
- Sustainable Industrial Ecology
- Advancements in Solid Oxide Fuel Cells
- Silicon Carbide Semiconductor Technologies
- Sustainability and Ecological Systems Analysis
- Advanced DC-DC Converters
- Dental Research and COVID-19
- Photoreceptor and optogenetics research
- SARS-CoV-2 detection and testing
Northwestern Polytechnical University
2018-2020
Xuchang University
2010
Precise commutation signal is the prerequisite for efficient operation of brushless direct current (BLDC) motors. However, low-pass filter, nonideal current, circuit, and software retarding can bring about errors that will deteriorate performance BLDC motors, example, resulting in larger ripple noise. To eliminate quickly improve motor, a novel compensation method proposed this letter. The time calculated by counter. And start-stop signals counter are obtained virtual neutral voltage....
For brushless dc motor operating at ideal commutation point, the angle of phase current vector will lag behind that back electromotive force (EMF) due to inductance. The increases root-mean-square (rms) value under a certain average torque output, which results in more heat and less efficiency, especially high rotational velocity. principle is equal EMF center conduction sector analyzed. A novel advance compensation method for point proposed based on principle. calculated real time according...
It is well known that there the commutation interference pulse in zero-crossing points (ZCPs) of back electromotive force (EMF) for brushless direct current (BLdc) motors. Generally, handled by a low-pass filter (LPF) with low cutoff frequency. However, phase delay caused LPF will deteriorate performance BLdc In this letter, novel phase-delay-free method based on terminal voltage proposed. The ZCPs and freewheeling signals are obtained according to voltages. Then, main part removed through...
This paper presents an observer based power switch open-circuit fault diagnosis method for a two-phase interleaved boost converter (IBC). Motivated by the simplicity and robustness of immersion invariant (I&I) theory, I&I observers are adopted residual generation. The inductor current output voltage used in controllers selected input estimation, which avoids use extra sensors. Furtherly, to eliminate unexpected effects, caused parameter uncertainty, adaptive threshold is designed. simulation...
Proton exchange membrane fuel cell (PEMFC) is considered to be a promising new energy technology due its high power density and low operating temperature. Oxygen excess ratio (OER) one of the main factors that affect performance systems. The key OER control prevent "oxygen starvation" phenomena by controlling air flow input cathode. net output optimized improve system while maintaining working properly. First all, sixth-order dynamic model PEMFC based on supply established in MATLAB,...
The ecological-economic system of resource-dependent cities is compound composed by the ecological and economic through certain technical means, environmental media process human labor. It includes energy, material information transmission. In order to maximize value entire achieve sustainable development systems, paper explained meaning system, defined three values form including value, social analyzed characteristics changes rules in Resource-dependent different stages life cycle, obtained...