Browsing by Author "Alam, Mohammad Ashraful"

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Antimicrobial resistance and molecular epidemiology of neisseria gonorrhoeae in bangladesh
(©University of Dhaka, 2023-12-14) Alam, Mohammad Ashraful
Antimicrobial susceptibility pattern of neisseria gonorrhoeae isolated from floating commercial sex workers in Dhaka, Bangladesh
(2002) Alam, Mohammad Ashraful; Miah, Mohammad Ruhul Amin; Rahman, Motiur; Sattar, Humayun; Saleh, Ahmed Abu
Design and Analysis of EV Controller using IPMSM Taking Core Loss into Account
(STM Journals, an imprint of CELNET (Consortium e-Learning Network Pvt. Ltd.), 2015) Alam, Mohammad Ashraful; Mannan, Mohammad Abdul
Now a days vehicles with electrical differentials are becoming more and more popular. The mechanical differentials are replaced by using two motors. In the electrical vehicle (EV) different types of electrical machines such as induction motor, permanent magnet synchronous motor etc. are used. The controller design for the different motors is a fascinating and challenging work to obtain desired performance properly. The interior-permanent magnet synchronous motor (IPMSM) has already been used to design electrical differential for an EV. The controllers which have been designed for this purpose depend on the mathematical model of IPMSM. Unfortunately, to design the controller for IPMSM the core loss has not been considered, but to obtain the precise torque control the core loss of an IPMSM should be considered. In this paper, the PI controllers of an electrical differential for an EV system based on the IPMSMs taking core loss is designed. The performances of designed controllers are evaluated by Matlab/Simulink software. In the simulation work three road conditions for EV are considered. One is when the road is curved to right. Other is when the road is curved to left and another one is for the slope type road. Their performances are shown separately as well as all together.
Modeling and Performance Analysis of Electrical Vehicle with SPWM Inverter-fed IPMSM Taking Core Loss into Account
(STM Journals, an imprint of CELNET (Consortium e-Learning Network Pvt. Ltd.), 2016) Alam, Mohammad Ashraful; Mannan, Mohammad Abdul; Rezwanuzzaman, Khondker; Amin, Mohammad Rashedul; Islam, Khan Mohammad Shariful
Because of the advantages of electrical differentials, people are becoming more interested in using them rather than using mechanical differentials. The mechanical differentials are replaced by using the two rear motors. In the electrical vehicle (EV) different types of electrical machines such as induction motor, permanent magnet synchronous motor etc. are used. The design of a controller is a challenging work, as the output of the motor has to match with the vehicle input. There are already some works done with IPMSM (Interior Permanent Magnet Synchronous Motor) for designing electrical differentials. The controller which was designed in this paper mainly depends on the mathematical model of the IPMSM. Unfortunately, to design the controller for IPMSM the inverter portion was taken as ideal, but to observe natural response of the motors; an inverter should be added with the motors. In this paper, the PI controllers of an electrical differential for an EV system based on the IPMSMs taking core loss into account with SPWM inverter feed is designed. The performances of designed controllers are evaluated by Matlab/Simulink software. In the simulation work three road conditions for EV are considered. One is when the road is curved to right. Other is when the road is curved to left and another one is for the slope type road. Their performances are shown separately.