Search

Your search keyword '"Orabi, Mohamed"' showing total 207 results
Start Over Author "Orabi, Mohamed" Publisher ieee
207 results on '"Orabi, Mohamed"'

14. A Novel Method to Suppress the Force Ripple of a Switched Reluctance Linear Motor.

Author

Chen, Hao, Liu, Jinfu, Wang, Xing, Li, Xiaodong, Orabi, Mohamed, Li, Ye, Gong, Yuancong, Parspour, Nejila, and Zhang, Jingxin

Subjects
SWITCHED reluctance motors, ADAPTIVE control systems, PERMANENT magnet motors, RELUCTANCE motors, MUTUAL inductance, ELECTROMAGNETIC forces
Abstract

A novel method to suppress the force ripple of switched reluctance linear motors (SRLMs) based on predictive-fuzzy control is proposed in this article. Generally, the force ripple mainly occurs in the commutation area, resulting from the dropping force of the outgoing phase that cannot match the rising force of the incoming phase. The force distribution function (FDF) is a suitable method for controlling the forces of the outgoing phase and incoming forces during the commutation area. However, the controller calculation takes time and the motor shows inductive behavior, so the control signal, which is the reference current in FDF, always lags the reference force, which weakens the effect of the FDF control. Considering this problem, a method of predictive-fuzzy control is proposed in this article. The current can be controlled in advance by predicting the force, which reduces the appearance of the negative electromagnetic force, which is beneficial to improving the efficiency of the motor, and the mutual inductance is also considered in the predictive model. Additionally, a fuzzy controller is employed, and adaptive parameters of the control system are adopted. To validate the proposed control system, experimental verification is performed on a 500 W 6/4 double-sided SRLM, showing that the proposed method has a better force ripple suppression performance than the FDF control. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

37. Novel Overlap Method to Eliminate Vector Deviation Error in SVM of Current Source Inverters.

Author

Gaber, Mahmoud, Abdel-Rahim, Omar, and Orabi, Mohamed

Subjects
HARMONIC suppression filters, SUPPORT vector machines
Abstract

The modulation signal of current source inverter contains an overlap instant to prevent interrupting the dc of the bulky input inductor. This overlap instant, located between vector states, results in output vector deviation errors which, in turn, leads to low-order harmonics in the output waveform. These harmonics are difficult to reject by the output filter. In this article, a novel modulation method is developed to realize zero-vector deviation error and, hence, eliminate the impact of the overlap instant. The ampere–second balance principle is applied to obtain the deviation error expression over the full range of the power factor angle. The mathematical expression of the vector deviation angle is derived in terms of the overlap time. Experimental results are provided to declare the effectiveness of the proposed modulation method. [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results