The resistance of one stator winding is estimated based on its length, cross-sec­tional area, and conductivity. The coil length is partially in the slots and partially in the end region. Thus, the resistance may be estimated and is the basis for estimating the stator resistance. The squirrel-cage rotor resistance is determined by adding the contributions […]

To express the flapping and torsion blade equations of motion in terms of multi­blade coordinates the collective and cyclic summation operators are applied to them. Thus, the flapping and torsion blade equations in multiblade coordinates are J 1 0 0 J 0 0 0 ‘j 1 0 0 ‘hi’ X П 0 1 0 ec […]

The major technical challenge of installing an offshore wind turbine is related to minimizing the wave-induced motion of the turbine rotor and understanding the coupling between support structure and the wind turbine, while achieving exceptional static and dynamic stability. Standard control algorithms for variable blade pitch turbines aimed at MPPT in a variable wind will […]

In a combustion chamber, the propellants are injected through a number of coaxial injectors, with oxidant injected usually through the center units and the fuel through the others to facilitate rapid premixing. The injectors are usually of theshear coaxial type, the swirl-coaxial type, or the impinging type. The shear coaxial injectors are supposedly effective in […]

Fuel cells need to be properly controlled during both the transient – and steady-state operations for optimum performance efficiency and long life. If not properly controlled, the cell efficiency will fall significantly during transient operations and the cell’s useful life will be reduced drastically. The efficiency of the fuel cell is highly dependent on the […]

The actual capacity of a battery can vary significantly from the rated capacity due to the non-linear effects resulting from past charges and discharges, aging of the battery, charging or discharging history of the battery, ambient temperature vari­ations, etc. Thus, it is customary to define a nominal capacity. The nominal capacity C of the cell […]

The actual wave power converted into useful power depends to a large extent the efficiency of conversion by the wave power transfer device employed for energy conversion. The wave power transfer devices currently in use fall broadly into two categories: (1) Oscillating body type of wave power transfer devices In this type of wave power […]

The fundamental performance characteristics of induction generators are plots of variations of the generator current with a control parameter such as the conduction angle of the IGBT-type controller. The current decreases by decreasing the con­duction angle while increasing the rotor speed increases the current. Another important characteristic is the harmonic factor in the generator current […]