Automatic Turn-off Angle Control for High Speed SRM Drives

Nashed Maged N.F.,Ohyama Kazuhiro,Aso Kenichi,Fujii Hiroaki,Uehara Hitoshi The Korean Institute of Power Electronics 2007 JOURNAL OF POWER ELECTRONICS Vol.7 No.1

This paper presents a new approach to the automatic control of the turn-off angle used to excite the Switched Reluctance Motor (SRM) employed in electric vehicles (EV). The controller selects the turn-off angle that supports and improves the performance of the motor drive system. This control scheme consisting of classical current control and speed control depends on a lookup table to take the best result of the motor. The turn-on angle of the main switches of the inverter is fixed at $0^{\circ}C$ and the turn-off angle is variable depending on the reference speed. The motor, inverter and control system are modeled in Simulink to demonstrate the operation of the system.

Transient Performance of a Hybrid Electric Vehicle with Multiple Input DC-DC Converter

Nashed, Maged N.F. The Korean Institute of Power Electronics 2003 JOURNAL OF POWER ELECTRONICS Vol.3 No.4

Electric vehicles (EV) demands for greater acceleration, performance and vehicle range in pure electric vehicles plus mandated requirements to further reduce emissions in hybrid electric vehicles (HEV) increase the appeal for combined on-board energy storage systems and generators. And the power electronics plays an important role in providing an interface between fuel cells (FC) and loads. This paper deals with a multiple input DC-DC power converter devoted to combine the power flowing of multi-source on energy systems. The multi-source is composed of (i) FC system as a prime power demands, (ii) super capacitor banks as energy storage devices for high and intense power demands, (iii) superconducting magnetic energy storage system (SMES), (iv) multiple input DC-DC power converter and (v) a three phase inverter-fed permanent magnet synchronous motor as a drive. In this system, It is used super capacitor banks and superconducting magnetic energy replaces from the battery system. The modeling and transient performance simulation is effective for reducing transient influence caused by sudden charge of effective load. The main purpose of power electronic converters is to convert the DC power output from the fuel cell and other to a suitable AC voltage, which can be connected to electric loads directly (PMSM). The fuel cell and other output is connected to the DC-DC converter, which regulates the DC link voltage.

Design of a Digital PWM Controller for a Soft Switching SEPIC Converter

Nashed, Maged N.F. The Korean Institute of Power Electronics 2004 JOURNAL OF POWER ELECTRONICS Vol.4 No.3

This paper presents analysis, modeling, and design of a low-harmonic, isolated, active-clamped SEPIC for future avionics applications. Simpler converter dynamics, high switching frequency, zero voltage-Transition-PWM switching, and a single-layer transformer construction result. This paper describes complete design of a digital controller for a high-frequency switching power supply. Guidelines for the minimum required resolution of the analog-to-digital converter, the pulse-width modulator, and the fixed-point computational unit is derived. A design example based on a SEPIC converter operating at the high switching frequency is presented. The controller design is based on direct digital design approach and standard root-locus techniques.

Design of a Digital PWM Controller for a Soft Switching SEPIC Converter

Maged N.F.Nashed 전력전자학회 2004 JOURNAL OF POWER ELECTRONICS Vol.4 No.3

This paper presents analysis, modeling, and design of a low-harmonic, isolated, active-clamped SEPIC for future avionics applications. Simpler converter dynamics, high switching frequency, zero voltage- Transition-PWM switching, and a single-layer transformer construction result. This paper describes complete design of a digital controller for a high frequency switching power supply. Guidelines for the minimum required resolution of the analog-to-digital converter, the pulse-width modulator, and the fixed-point computational unit is derived. A design example based on a SEPIC converter operating at the high switching frequency is presented. The controller design is based on direct digital design approach and standard root-locus techniques.

Transient Performance of a Hybrid Electric Vehicle with Multiple Input DC-DC Converter

Maged N.F. Nashed 전력전자학회 2003 JOURNAL OF POWER ELECTRONICS Vol.3 No.4

Electric vehicles (EV) demands for greater acceleration, performance and vehicle range in pure electric vehicles plus mandated requirements to fm1her reduce emissions in hybrid electric vehicles (HEV) increase the appeal for combined on-board energy storage systems and generators And the power electronics plays an important role in providing an interface between fuel cells (FC) and loads This paper deals with a multiple input DC-DC power converter devoted to combine the power flowing of multi-source on energy systems. The multi-source is composed of (Ⅰ) FC system as a prime power demands, (Ⅱ) super capacitor banks as energy storage devices for high and intense power demands, (Ⅲ) superconducting magnetic energy storage system (SMES), (IV) multiple input DC-DC power converter and (Ⅴ) a three phase inverter-fed permanent magnet synchronous motor as a drive In this system) It is used super capacitor banks and superconducting magnetic energy replaces from the battery system. The modeling and transient performance simulation is effective for reducing transient influence caused by sudden charge of effective load The main purpose of power electronic converters is to convert the DC power output from the fuel cell and other to a suitable AC voltage, which can be connected to electric loads directly (PMSM) The fuel cell and other output is connected to the DC-DC converter, which regulates the DC link voltage

Simulation and Experimentals of a Bi-Directional Converter with Input PFC on SRM System

Maged N. F. Nashed 전력전자학회 2006 JOURNAL OF POWER ELECTRONICS Vol.6 No.2

This paper presents the performance and efficiency of a drive system incorporating a switched-reluctance motor (SRM) with input power factor correction (PFC). The proposed system consists of a PFC, bi-directional converter, an inverter, and a SRM operating as based voltage source drives (VSD). First, theoretical analysis is made for each identified mode of operation in the drive system. This is followed by comparing the performance of the SRM drive system with and without a PFC circuit. The losses are also calculated for both systems and overall efficiency. Experimental results are presented to prove the theoretical analysis.

Automatic Turn-off Angle Control for High Speed SRM Drives

Maged N. F. Nashed,Kazuhiro Ohyama,Kenichi Aso,Hiroaki Fujii,Hitoshi Uehara 전력전자학회 2007 JOURNAL OF POWER ELECTRONICS Vol.7 No.1

This paper presents a new approach to the automatic control of the turn-off angle used to excite the Switched Reluctance Motor (SRM) employed in electric vehicles (EV). The controller selects the turn-off angle that supports and improves the performance of the motor drive system. This control scheme consisting of classical current control and speed control depends on a lookup table to take the best result of the motor. The turn-on angle of the main switches of the inverter is fixed at 0° and the turn-off angle is variable depending on the reference speed. The motor, inverter and control system are modeled in Simulink to demonstrate the operation of the system.

Design Using Finite Element Analysis of a Switched Reluctance Motor for Electric Vehicle

Ohyama Kazuhiro,Nashed Maged Naguib F.,Aso Kenichi,Fujii Hiroaki,Uehara Hitoshi The Korean Institute of Power Electronics 2006 JOURNAL OF POWER ELECTRONICS Vol.6 No.2

In this paper, a Switched Reluctance Motor (SRM) employed in an electric vehicle (EV) is designed using the finite element method (FEM). The static torque of the SRM is estimated through magnetic field analysis. The SRM temperature rise over operation time is estimated through heat transfer analysis. First, static torque and temperature rise over the time of 600W SRM is included in the experiment set, and are compared with the calculated results using the FEM under the same conditions. The validity of the magnetic field analysis and heat transfer analysis is verified by the comparisons. In addition, a 60 [kW] SRM employed in an EV, whose output characteristics are equal to a 1500 [cc] gasoline engine, is designed under magnetic field analysis and heat transfer analysis.

A Fuzzy Predictive Sliding Mode Control for High Performance Induction Motor Position Drives

Bayoumi E.H.E.,Nashed M.N.F. The Korean Institute of Power Electronics 2005 JOURNAL OF POWER ELECTRONICS Vol.5 No.1

This paper presents a fuzzy predictive sliding mode control for high performance induction motor position drives. A new simplified inner-loop sliding-mode current control scheme based on a nonlinear mathematical model of an induction motor is introduced. Novel predictive fuzzy logic PI and PID controllers are used in speed and position loops, respectively. Sliding-mode current controllers and fuzzy predictive logic controllers are designed based on indirect vector control. The overall system performance is examined under different dynamic operating conditions. The performance of the drive system is robust and stable, and insensitive to parameters and operating condition variations even though non-exact system parameters are used in the implementation of the proposed controllers.

A novel mechanism of irinotecan targeting MDM2 and Bcl-xL

Lee, Boah,Min, Jeong A.,Nashed, Abdullateef,Lee, Sang-Ok,Yoo, Jae Cheal,Chi, Seung-Wook,Yi, Gwan-Su Elsevier 2019 Biochemical and biophysical research communication Vol.514 No.2

<P><B>Abstract</B></P> <P>Irinotecan is a strong anticancer drug whose mechanism of action has been reported only for the inhibition of DNA topoisomerase I (Topo I) through its active metabolite SN-38. In this study, we present a new mechanism of Irinotecan which inhibits the activities of MDM2, an E3 ligase of tumour suppressor p53, and Bcl-xL, an anti-apoptotic protein, through direct binding. In our structure modelling study, Irinotecan could fit to the binding sites of MDM2 and Bcl-xL for their known drugs, Nutlin-3 and ABT-737, with a better binding affinity than to Topo I. The direct binding of Irinotecan to both proteins was confirmed through a NMR study. We further showed that Irinotecan increased the amount of p53 only in the presence of MDM2 and inhibited the physical interaction of Bcl-xL with Bim, a core pro-apoptotic protein. In addition, we demonstrated that Irinotecan induced the down regulation of proliferation and strong G2/M arrest in HCT116 colon cancer cells shortly after treatment. Collectively, we suggest a new mechanism of action for Irinotecan as a dual target inhibitor of MDM2 and Bcl-xL facilitating the anticancer activities mediated by p53 and Bcl-xL interaction partners.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The direct binding of Irinotecan to MDM2 and Bcl-xL was confirmed in modelling and NMR. </LI> <LI> The effects of Irinotecan in MDM2 were confirmed by cell cycle, proliferation, and p53 expression. </LI> <LI> The effects of Irinotecan in Bcl-xL were confirmed by apoptosis and Bcl-xL-Bim binding. </LI> <LI> Irinotecan regulates proliferation, apoptosis and induces strong G2/M arrest. </LI> </UL> </P>