Master's Degree

Oct 2, 1990 - Nov 2, 1992

Bachelor Degree

Sep 15, 1983 - Jun 15, 1987

Electronics, Power Electronics [Assist. Lecturer]

Nov 15, 2011 - Present

Assistant. Lecturer at Northern Technical University

تدريب وتطوير [مهندس استشاري]

Jun 6, 1999 - Aug 1, 2011

Electronis, Power Planet [Assist. Lercturer]

Apr 5, 1994 - Apr 5, 1999

Design of second order sliding mode observer based equivalent Back-EMF for rotor position estimation of PMSM

Jul 20, 2021

Journal Periodicals of Engineering and Natural Sciences

Issue 3

Volume 9

This study introduces a scheme to estimate rotor position by the use of an Equal electromotive force (EMF) model of a synchronous machine. This use could be substituted by a sliding-mode observer (SMO) according to an equal EMF for superior reference speed tracking. There is an algorithm of the second order sliding-mode-control (SO-SMC) in controlling speed of permanent magnet synchronous motor (PMSM). This is by the use of the proportional plus-integral PI control sliding plane. The current work discusses the PMSM, which follows field-oriented appears. In addition, there are SO-SMC laws and PI sliding plans. This paper shows that the proposed high-speed PMSM sensorless speed control is valid by MATLAB simulations.

Studying the light current characteristics of VCSEL by changing oxide confinement aperture

Dec 16, 2020

Journal Periodicals of Engineering and Natural Sciences

Issue 4

Volume 8

GaAs-based VCSELs with oxide-confined (OC) are performed by using fine selective radial “oxidation of AlAs-rich (AlGaAs) layers” from outside to the device axis leaving the central part unaffected. Such oxide apertures produced inside the cavities enhance the radial confinements related to current spreading and to a field that is optical altogether. A Modern design with a single fundamental mode is proposed to reduce threshold current operation to the extent of higher output by using the two OC VCSELs. Both of the oxide apertures were added to the node position of the resonator standing wave. Then, the diameters of together apertures can be adjusted independently giving VCSEL design an extra degree of freedom that allows optimization. It found that when both apertures had a radius of 4.2 μm, the low threshold current operation at a higher extent output is achieved with a single fundamental mode.