Multi-axis stepper motors offer a compact solution to actuate multiple degrees of freedom in mechanical system by single device. This research presents an electric motor with three coaxial shafts driven stator. The dimensions are 42 × 44 mm$^3$ (excluding output shafts), its mass is 0.326 kg and it includes rotors height 7 mm different number teeth. maximum torque for one rotor at low speed 1 A...

nowadays, energy plays an important role in the economic and community development of country. consequently, performance analysis of energy systems is one of the effective methods being used to prevent waste of energy resources. among the different power generation technologies, steam power plants make a significant contribution to power generation in iran, with a share of 47 % of electricity g...

in this study a pseudo comprehensive carbon footprint model for fossil fuel power plants is presented. parameters which their effects are considered in this study include: plant type, fuel type, fuel transmission type, internal consumption of the plant, degradation, site ambient condition, transmission and distribution losses. investigating internal consumption, degradation and site ambient con...

To alleviate the mass-scaling issues associated with conventional upwind rotors of extreme-scale wind turbines (≥10MW), a morphing downwind-aligned rotor (MoDaR) concept is proposed herein. The concept employs a downwind rotor with blades whose elements are stiff (no intentional flexibility) but with hub-joints that can be unlocked to allow for momentfree downwind alignment. Aligning the combin...

The internally geared gerotor type of positive displacement machine is widely used for pumping applications, but can also be to achieve internal compression or expansion a working fluid. A further development this configuration the application helical twist inner and outer rotors. Previous studies have shown that decrease power transferred between rotors, increase relative maximum flow areas at...

Molecular rotors are fluorescent molecules that are characterized by the ability to form twisted states through the rotation of one segment of the structure with respect to the rest of the molecule. Intramolecular rotation changes the groundstate and excited-state energies, and molecular rotors deexcite from the twisted state either without photon emission or with a different wavelength than fr...

the main objectives of this paper are measuring the technical efficiency of iranian thermal power plants and investigating the determinants of technical efficiency levels in these plants. stochastic nonparametric envelopment data (stoned) method applied to plant-level data over a period of thirteen years from 1999 to 2011. this is the first comprehensive analysis (to our knowledge) of technical...

This paper compares four prototype Synchronous Reluctance Motors (SynRMs) having an identical geometry of iron lamination stacks in the stator and rotor. Two different stator winding layouts are employed: a conventional three-phase star connection and a combined star–delta winding. In addition, two rotors are considered: a conventional rotor without magnets and a rotor with ferrite magnets. The...

Probes embedded within a structure can enable prediction of material behavior or failure. Carefully assembled composites that respond intelligently to physical changes within a material could be useful as intrinsic sensors. Molecular rotors are one such tool that can respond optically to physical environmental changes. Here, we propose to use molecular rotors within a polymersome membrane to re...