The bridgeless power factor correction (PFC) converter is popular for reducing the conduction losses of semiconductors. In this article, a novel Cuk PFC proposed. Compared with conventional converter, number conducting semiconductors in proposed reduced, contributing to lower losses. Moreover, are further improved compared pseudototem-pole converter. Meanwhile, total component less than other counterparts, especially big-volume magnetic and electrolytic capacitor. addition, all switches...

For the purpose of simplifying physical structure, improving anti-disturbance performance and enhancing response Permanent Magnet Synchronous Motor (PMSM), this paper proposes a novel sensorless fixed-time sliding mode control scheme with fast convergence for PMSM. Firstly, to realize control, Barrier Function (BF)-based Adaptive Super-Twisting Observer (BF-ASTO) is designed accurately estimate rotor's position speed The BF chosen as an adaptive algorithm online tuning parameters BF-ASTO...

Mulberry twigs, a traditional Chinese medicinal and agricultural byproduct, contain bioactive compounds with anti-atherosclerotic potential. This study aims to identify evaluate the effects of key in mulberry twig extracts (MTEs) on oxidized low-density lipoprotein (ox-LDL)-induced human umbilical vein endothelial cells (HUVECs), focus understanding how these modulate oxidative stress related signaling pathways. Biospecific cell extraction ultra-performance liquid chromatography–tandem mass...

Due to the defects of way traditional grid power supply, microgrid arises at historic moment. At present, DC is an effective solution integrate renewable energy sources which are supply with loads. In allusion unbalance intra-microgrid and wide fluctuation bus voltage due unstable output micro resources in microgrid, A structure consisting photovoltaic generation system, hybrid storage systems AC main grid, researched this paper. novel management strategy for proposed. The control divides...

Abstract Hilly terrain can significantly change the flow characteristics of atmospheric boundary layer. However, effects hilly with different steepness on turbine wakes remain understudied. To this end, a wind is placed hilltop steepness, and spread wake investigated via large‐eddy simulation. Results show that, above gentle hills, deflects upward crest downward valley, while for steep in way. Through analysis transport mean kinetic energy, it be found that pressure term works mechanisms...

Abstract Background High-mobility group B1 (HMGB1) is both a DNA binding nuclear factor modulating transcription and crucial cytokine that mediates the response to infectious noninfectious inflammation such as autoimmunity, cancer, trauma, ischemia reperfusion injury. HMGB1 has been proposed control ribosome biogenesis, similar other members of class HMGB proteins. Results Here, we report selectively promotes genes involved in regulation transcription, osteoclast differentiation apoptotic...

Droop control methods are usually used for the parallel operation of multi-converters in microgrid to avoid dependence communication system. However, current sharing among parallel-connected converters is affected due high resistive line impedance low voltage Virtual was then presented improve load accuracy by adjustment total equivalent output between and AC bus. virtual loop will cause large reduction on inverters which may deteriorate quality. In this paper, an amplitude correction method...

In this paper, a nonlinear N-L-N Hammerstein-Wiener model is used to build the vibration of power transformer for online monitoring winding condition. The mechanism identification presented first. Then introduced and ways estimate parameters illustrated explicitly. Validation over an in-service gird done verify effectiveness model. estimated results show good fitness with measured data collected from system, which indicates its correctness proposed Moreover, compare existing methods, in...

Permanent magnet synchronous motor (PMSM) needs to drive variable load with large inertia when it is applied robot joints and other occasions. Traditional PID servo control system cannot realize accurate position tracking. Aiming at this problem, a feed-forward strategy studied in paper. The innovations of paper mainly include the following points: 1) Mathematical model PMSM manipulator established, influence on coefficient calculated. 2) simulation was built by MATLAB experiment verified...

Abstract A novel programmed hybrid spreading spectrum modulation method to mitigate electromagnetic interference (EMI) emission and bearing current in the context of miniaturised lightweight synchronous machine drives is proposed. The proposed adopts combination conventional pulsewidth (PWM) low common mode voltage PWM. offline look‐up table for switching frequency acquired by analysing root mean square values at different indices angles. By adjusting according this table, can be spread into...

Abstract In this paper, an unmanned bicycle (UB) with a reaction wheel is designed, and second-order mathematical model uncertainty established. order to achieve excellent balancing performance of the UB system, adaptive controller which composed nominal feedback control, compensating control using extreme learning machine observer reaching via integral terminal sliding mode (ITSM) barrier function (BF)-based law. Owing features BF-based ITSM (BFITSM), not only any or disturbance upper bound...

This paper designs a high reliability and compact PMSM (permanent magnet synchronous machine) controller based on parallel-connected power MOSFETs with an optimized current sharing technology. The innovative work of the is as follows: 1. Using self-made pioneering induction coils to select MOSFET similar performance. 2. positive voltage negative are used driving circuit control unit, so that unit same bridge arm can synchronously possible. 3. In event misoperation, multiple protection...

In the field of motor control, parallelled MOSFETs is often used as power output module in order to pursue miniaturization controller. Although many characteristics MOSFET are easy be parallel, problem overcurrent caused by inconsistency switching process has not been solved fundamentally. this paper, current state device applied SVPWM control algorithm at moment commutation analyzed detail. The inconsistencies under general topology, which makes transition smoothly body-diode and forward...

This paper proposes a complex vector discrete current controller based on the flux-linkage data to solve loop oscillation problem of high power-density synchronous machines. An offline table measurement method considering cross saturation is introduced, and are used deduce symmetrical model. The influence latch delay inverters line voltage machines at speed analyzed compensated during design process. proposed controller, which only needs tune one parameter, can deal with inductance mismatch...

In order to solve the problem of torque-ripple in control system ship main propulsion motor controlled by direct torque control, this paper proposes a super-twisting sliding mode calculation method based on traditional controller, and designs corresponding controller according method. The is verified Matlab/Simulink simulation tool. waveform, estimated speed almost consistent with actual motor, rotor position small error. It proved that has good practicability effective feasibility electric...

The fit of the bearing with end cover, shaft and wave spring washer has a great impact on motor NVH, so it is significance to calculate analyze tolerance bearings selection washers. This article discusses several factors that affect automotive motors. Based numerical calculation, theoretical analysis, simulation analysis experimental verification, we propose scheme shaft, cover tolerance, puts forward influence rotor mode optimal considering NVH motor.

In the robot industry, joint motor often plays key role of instantaneous output high power and torque. process large torque output, support current controller is needed. The electromagnetic environment quite complex in such a working state. How to ensure reliable operation harsh becomes an inevitable problem be considered. This article first introduced enhance compatibility relevant principle applied practice. And then through test components under conditions behavior summarized properties...