Skip to main content

Posts

Study of solar charger system

Recent technological developments in thin-film photovoltaics (PVs), such as amorphous silicon and hybrid dye-sensitized/PV cells, are leading to new generations of portable solar arrays. These new arrays are lightweight, durable, flexible, and have been reported to achieve power efficiencies of up to 10%. Since the emergence of these flexible and foldable solar arrays, there has become a need to develop solar battery chargers for more portable batteries, such as nickel-metal hydride (NiMH) and Lithium-ion (Li-ion) batteries for military and consumer applications. This paper describes the development of a solar battery charger for Li-ion batteries. Two electrical engineering technology undergraduate students formed a senior design project team to design and implement a solar battery charger. A senior design project is an integral part of the undergraduate engineering technology degree program requirements at Northern Illinois University. All students are required to complete a two-semes...
Post a Comment
Read more
Recent posts

WORKING AND CONSTRUCTION OF BLDC MOTOR

  ABSTRACT Electric vehicles are the best solution for green transportation due to their high efficiency and zero greenhouse gas emissions. Various electric motors have been used as the propulsion system of electric vehicles. Performance of brushed Direct Current (DC) motors, induction motors, switched reluctance motors, and permanent magnet Brushless DC (BLDC) motors are compared according to the in-wheel motor technology requirements under normal and critical conditions through simulation. This study shows that BLDC motors are the most suitable electric motor for the high-performance electric vehicles. An accurate model of a BLDC motor is needed to investigate the motor performance for different control algorithms. Therefore a BLDC motor with an ideal back-Electro Motive Force (EMF) voltage and its control drive are modelled in Simulink. Correct performance of the BLDC motor drive model is validated through experimental data. Direct torque control technique is a type of flux ...
Post a Comment
Read more

Construction and working of Repulsion Type Moving Iron Voltmeter and dynamometer type wattmeter

Repulsion type Moving Iron instruments and Dynamometer type wattmeter 1. Construction and working of  Repulsion Type Moving Iron Voltmeter/Instruments. Construction : One variation of moving iron instrument is repulsion type instrument. Here we keep the shaft of the moving system along the axis of the coil. We attach a soft iron bar or rod to the shaft so that it can move with the movement of the moving system. We fix another soft iron bar or rod with the inner coil body as shown. When there is no current in the coil, both iron bars are nearest to each other. Working : The current in the coil produces the magnetic field. The magnetic field induces same magnetic poles to similar ends in both of the iron bars or rods. Naturally, these two iron bars repel each other. The repulsive force causes the deflection of the pointer attached to the moving system. This is because due to the repulsive force, the bar attached to the moving system tries to go away from the bar fixed to the inner co...
Post a Comment
Read more

What is D.C. Generator

  D.C. Generator Construction and working principle of DC Generator DC Machines are mainly divided in two types Motor and Generator. Here we see only about Generator. Motor will be covered in another blog. Working principle of DC generator : All the generators work on a principle of dynamically induced E.M.F.  This principle nothing but the Faraday’s law of electromagnetism induction.  It states that, “When electric supply given to any conductor it produces magnet fluxes around it these fluxes link with a conductor or a coil. Then voltage is produced in that conductor or coil.’ But this happened only when there exists a relative motion between a conductor and the flux.” The relative motion can be achieved by rotating conductor with respect to flux or by rotating flux with respect to a conductor. So, a voltage gets generated in a conductor, as long as there exists a relative motion between conductor and the flux. Such an induced EMF which is due to the physical movem...
Post a Comment
Read more