In the rotor reference frame, the input-output linearization theory was adopted to decouple the rotor position and rotor flux. We then designed two adaptation laws to estimate the rotor resistance and mechanical parameters of the motor. The passive properties of the negative feedback connection from the rotor flux observer to the rotor resistance estimator, and the position controller were anal...

This study presents a designing process for refurbishing of a 32 MW rotor-generator damaged coupling. The reason of rotor damage was being hit by the quivers of an explosion. The original coupling was union with the rotor formed after a machining process on a mono block forged rotor. In some areas imposed damages caused the breaking off and detachment of some parts in the coupling flange. Becau...

The possibility of decreasing the drag coefficient slotted airfoil is investigated at Reynold number 1.6 x106 for angles attack were ranged from 0°to 20°. For this purpose, edges simple slot had been made with curve edges. numerical study was evaluated by using ANSYS fluent 21.0 κ-ω SST turbulence to solve fully turbulent Navier-stocks equations. location and dimensions adopted previous conside...

Due to the local inhomogeneous magnetic saturation of core interior permanent magnet synchronous motor (IPMSM), field changes nonlinearly, which makes analytical calculation difficult. Therefore, mostly relies on finite element method (FEM). However, high computation cost FEM restricts efficiency design and analysis IPMSM. In this article, an model (AM) slotless open-circuit air-gap (OC-AG-MF) ...

In this description of the Enigma rotor movement sequence the following conventions have been adopted. The three rotors are numbered from right to left as seen from the machine operator’s viewpoint thus, the ‘fast’ or right hand rotor is Rotor 1, Rotor 2 is in the middle position and the ‘slow’ or left hand rotor is Rotor 3. The associated ratchets, stepping levers and notches are similarly des...

Lightweight single-layer slotted waveguide array antennas are fabricated using plastic materials with metal-plating. A plastic material that has good heat-radiation properties is investigated. Three types of antennas are fabricated by milling, using ABS resin, heat-radiating plastic, and aluminum alloy. In measurements, all three types of antennas are confirmed to have almost the same VSWR and ...

Effects of magnetic saturation on various equivalent circuit models of an induction motor are studied. The parameters of 2.2-kW and 37-kW motors with closed rotor slots are analyzed using finite element computations. Both skewed and unskewed rotor slots are studied. The magnetizing inductance not only depends on the main flux, but is also dependent on the rotor current, especially if the rotor ...

The n3 and n4 vibrational transitions of methane trapped in solid parahydrogen have been observed by using Fourier transform infrared and high resolution laser spectroscopy. The observed spectrum is interpreted in terms of rovibrational states of the spherical rotor which are subjected to the crystal field splitting. The n4 band shows extremely sharp lines of a width of ;0.003 cm , while the n3...

We have developed a simple convergent procedure for the synthesis of molecular rotors consisting of a central aromatic group coupled with two axially positioned ethynyltriptycenes. Molecular rotors with 1,4-phenylene (1), 1,4'-1,1'-biphenylene (2), 9,10-anthracenylene (3), and 2,7-pyrenylene (4) groups were prepared by Pd(0)-catalyzed coupling of ethynyl triptycenes with the corresponding dibro...

A new online identification methodology for estimation of the rotor flux components and the main electrical parameters of vector controlled induction motors is presented in this paper. The induction motor model is referred to the rotor reference frame for estimation of rotor flux and rotor parameters, and referred to the stator reference frame to estimate stator parameters. The stator parameter...