A welding seam tracking visual sensor based on laser scanning is designed to solve the problems, such as indistinct image, difficulty in processing image etc., caused by serious arc light interference during welding. This visual sensor is mainly composed of a scanning motor, a linear-array CCD, a scanning rotating mirror and a semiconductor laser. Because the sensor measurement precision relies...

An improved sliding mode observer is presented to estimate the rotor position of the permanent magnet synchronous motors (PMSMs). In this observer, the discontinuous control is replaced by using the sigmoid function in order to reduce the chattering problem commonly found in the conventional sliding mode observer. When the chattering is reduced, the back emf can be obtained directly from the sw...

This paper proposes a single-phase seven-level inverter for grid-connected photovoltaic systems, with a novel pulsewidth-modulated (PWM) control scheme. Three reference signals that are identical to each other with an offset that is equivalent to the amplitude of the triangular carrier signal were used to generate the PWM signals. The inverter is capable of producing seven levels of output-volt...

This paper presents a unique voltage-raising topology for single-phase seven-level inverter with triple output voltage gain using single input source and two switched capacitors. The has been boosted up to three times the value of by configuring capacitors in series parallel combinations which eliminates use additional step-up converters transformers. selective harmonic elimination (SHE) approa...

In order to save numerous man power hours fritter away to monitor various process parameters in industries whole day, the design presented in this paper gives solution to acquire data at desired rate and monitor fault with alarm system. The design introduces wireless information flow between on field acquisition and remote monitoring part at the office. DSP processor TMS320F2812 which is a very...

Voltage sag compensator is very important in power quality. Its performance also depends on the types of sag detection techniques used. Sag detection technique determines the dynamic performance of a voltage-sag compensator. Many techniques have been introduced to measure and to detect voltage sag, such as RMS-Value Evaluation and Peak-Value Evaluation. Unfortunately, most of the techniques req...

Vector control is one of the standard techniques used for the control of a permanent magnet synchronous motor (PMSM). The outer speed loop in vector controlled PMSM drive greatly affects the drive performance. In order to combine the advantages of proportional plus integral (PI) and fuzzy controllers, hybrid fuzzy-PI controllers are used in which the output can either be the outputs of the two,...

DC micro-grid is a novel ideal of advanced electricity delivery infrastructure which actively integrates a variety of renewable sources, energy storages, and loads within a local network; this type of lumped system organization can offer a fast, high quality and survivable solution for future residential and industrial power network. DC micro-grids can be the building block of future smart-grid...