Mohiuddin Mahbub | University of Southern Denmark (original) (raw)
Papers by Mohiuddin Mahbub
2021 2nd International Conference on Robotics, Electrical and Signal Processing Techniques (ICREST), 2021
Demand for induction motor is ever-growing. With increasing demand, a necessity arises to find ef... more Demand for induction motor is ever-growing. With increasing demand, a necessity arises to find efficient motor controlling method. PWM technique is efficient method used to vary voltage and frequency within inverter. A comparative study of five different PWM techniques of three-phase inverter for best induction motor drive performance is presented here using Simulink simulation. Sinusoidal PWM, Sixty-Degree PWM, Trapezoidal PWM, Third Harmonic Injected PWM (THIPWM), Space Vector PWM techniques are presented here. Motor parameters like rotor speed, rotor steady speed obtaining time etc. along with inverter output voltage THD & current THD were observed by varying modulation index, carrier frequency and load torque of motor drive. The simulation result shows that THIPWM exhibits the best induction motor drive performance compared to other PWM techniques. Using THIPWM, effect of high carrier frequency on rotor current, stator current, electromagnetic torque etc. is also presented here.
2021 2nd International Conference on Robotics, Electrical and Signal Processing Techniques (ICREST), 2021
PWM technique can reduce switching and harmonic losses of the inverter. Hybrid PWM inverter utili... more PWM technique can reduce switching and harmonic losses of the inverter. Hybrid PWM inverter utilizes half of the switches to operate at low-frequency signal and the other half of the switches to operate at high-frequency signal to reduce switching loss. But switching loss and heat dissipation among switches are uneven which reduces system reliability. Three-phase symmetrical hybrid sinusoidal PWM inverter is proposed where all switches operate at low and high-frequency signals alternatively which removes unequal switching loss and heat dissipation between switches. Switching loss, heat dissipation and total harmonic distortion of SHSPWM inverter don't vary from HPWM. The SHSPWM inverter is simulated without and with a pie filter in MATLAB/Simulink software to understand performance differences. SHSPWM performance is compared with Sinusoidal PWM, Sixty-Degree PWM and Trapezoidal PWM. The analysis was done by varying modulation index and carrier frequency to see inverter output variation.
International Conference on Computer, Communication, Chemical, Materials and Electronic Engineering, 2018
Wireless power transmission is widely used to recharge batteries, electric vehicles, and other sm... more Wireless power transmission is widely used to recharge batteries, electric vehicles, and other small microelectronic devices. This work involves performance analysis of 2-coil and 3-coil inductive link wireless power transmission (WPT) system using newly devised mutual inductance formula. Power transfer efficiency (PTE), power delivered to the load (PDL) are used as performance parameters and figure of merit (FoM) is used as optimizing parameter to analyze 2-coil and 3-coil link WPT system. To make a good inductive link design, FoM must be considered which can help designers to make a balance between PTE and PDL at the same time. We have proposed that 3-coil link has much higher PTE, PDL and FoM compared to the 2-coil link and also showed how the optimizing parameter FoM changes with the increase of quality factor of primary coil for both inductive link WPT system. At ISM Band 13.56MHz carrier frequency and 12cm coupling distance, 2-coil and 3-coil inductive links have PTE of 11.68%, 48.32% respectively and PDL of 0.318W, 0.761W respectively. The FoM of 2-coil and 3-coil inductive links showed 0.149W, 2.03W respectively at 12cm coupling distance. These results have been verified through simulated data. Index Terms-Wireless power transmission, power transfer efficiency, power delivered to the load, figure of merit.
Books by Mohiuddin Mahbub
Scroggie of the MOODY BIBLE INSTITUTE, Chicago, one of the most prestigious Christian Evangelical... more Scroggie of the MOODY BIBLE INSTITUTE, Chicago, one of the most prestigious Christian Evangelical Mission in the world, answering the question-"Is the Bible the Word of God?" (also the title of his book), under the heading: IT IS HUMAN, YET DIVINE. He says on page 17: "Yes, the Bible is human, though some, out of zeal which is not according to knowledge, 1 have denied this. Those books 2 have passed through the minds of men, are written in the language of men, were penned by the hands of men, and bear in their style the characteristics of men." (Emphasis added).
The use of general descriptive names, registered names, trademarks, etc. in this publication does... more The use of general descriptive names, registered names, trademarks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use.
This publication is in copyright. Subject to statutory exception and to the provision of relevant... more This publication is in copyright. Subject to statutory exception and to the provision of relevant collective licensing agreements, no reproduction of any part may take place without the written permission of Cambridge University Press.
The use of general descriptive names, registered names, trademarks, etc. in this publication does... more The use of general descriptive names, registered names, trademarks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use.
Muhammad which must not flow together, but each in its own course; and he entrusted Hagar and Ish... more Muhammad which must not flow together, but each in its own course; and he entrusted Hagar and Ishmael to the blessing of God and the care of His Angels in the certainty that all would be well with them. Two spiritual streams, two religions, two worlds for God; two circles, therefore two centres. A place is never holy through the choice of man, but because it has been chosen in Heaven. There were two holy centres within the orbit of Abraham: one of these was at hand, the other perhaps he did not y~t know; and it was to the other that Hagar and Ishmael were guided, in a barren valley of Arabia, some forty camel days south of Canaan. The valley was named Becca, some say on account of its narrowness: hills surround it on all sides except for three passes, one to the north, one to the south, and one opening towards the Red Sea which is fifty miles to the west. The Books do not tell us how Hagar and her son reached Becca; perhaps some travellers took care of them, for the valley was on one of the great caravan routes, sometimes called "the incense route", because perfumes and incense and such wares were brought that way from South Arabia to the Mediterranean; and no doubt Hagar was guided to leave the caravan, once the place was reached. It was not long before both mother and son were overcome by thirst, to the point that Hagar feared Ishmael was dying. According to the traditions of their descendants, he cried out to God from where he lay in the sand, and his mother stood on a rock at the foot of a nearby eminence to see if any help was in sight. Seeingno one, she hastened to another point of vantage, but from there likewise not a soul was to be seen. Half distraught, she passed seven times in all between the two points, until at the end of her seventh course, as she sat for rest on the further rock, the Angel spoke to her. Inthe words of Genesis: And God heard the voice of the lad; and the angel of God called to Hagar out ofheaven and said to her: What aileth thee, Hagar? Fear not, for God hath heard the voice of the lad where he is. Arise and lift up the lad and hold him in thy hand, for I will make him a great nation. And God opened her eyes, and she saw a well ofwater,' I :1.1: 17-2 0 • 2 ibid.
The titles published in this series are listed at brill.com/mumi
2021 2nd International Conference on Robotics, Electrical and Signal Processing Techniques (ICREST), 2021
Demand for induction motor is ever-growing. With increasing demand, a necessity arises to find ef... more Demand for induction motor is ever-growing. With increasing demand, a necessity arises to find efficient motor controlling method. PWM technique is efficient method used to vary voltage and frequency within inverter. A comparative study of five different PWM techniques of three-phase inverter for best induction motor drive performance is presented here using Simulink simulation. Sinusoidal PWM, Sixty-Degree PWM, Trapezoidal PWM, Third Harmonic Injected PWM (THIPWM), Space Vector PWM techniques are presented here. Motor parameters like rotor speed, rotor steady speed obtaining time etc. along with inverter output voltage THD & current THD were observed by varying modulation index, carrier frequency and load torque of motor drive. The simulation result shows that THIPWM exhibits the best induction motor drive performance compared to other PWM techniques. Using THIPWM, effect of high carrier frequency on rotor current, stator current, electromagnetic torque etc. is also presented here.
2021 2nd International Conference on Robotics, Electrical and Signal Processing Techniques (ICREST), 2021
PWM technique can reduce switching and harmonic losses of the inverter. Hybrid PWM inverter utili... more PWM technique can reduce switching and harmonic losses of the inverter. Hybrid PWM inverter utilizes half of the switches to operate at low-frequency signal and the other half of the switches to operate at high-frequency signal to reduce switching loss. But switching loss and heat dissipation among switches are uneven which reduces system reliability. Three-phase symmetrical hybrid sinusoidal PWM inverter is proposed where all switches operate at low and high-frequency signals alternatively which removes unequal switching loss and heat dissipation between switches. Switching loss, heat dissipation and total harmonic distortion of SHSPWM inverter don't vary from HPWM. The SHSPWM inverter is simulated without and with a pie filter in MATLAB/Simulink software to understand performance differences. SHSPWM performance is compared with Sinusoidal PWM, Sixty-Degree PWM and Trapezoidal PWM. The analysis was done by varying modulation index and carrier frequency to see inverter output variation.
International Conference on Computer, Communication, Chemical, Materials and Electronic Engineering, 2018
Wireless power transmission is widely used to recharge batteries, electric vehicles, and other sm... more Wireless power transmission is widely used to recharge batteries, electric vehicles, and other small microelectronic devices. This work involves performance analysis of 2-coil and 3-coil inductive link wireless power transmission (WPT) system using newly devised mutual inductance formula. Power transfer efficiency (PTE), power delivered to the load (PDL) are used as performance parameters and figure of merit (FoM) is used as optimizing parameter to analyze 2-coil and 3-coil link WPT system. To make a good inductive link design, FoM must be considered which can help designers to make a balance between PTE and PDL at the same time. We have proposed that 3-coil link has much higher PTE, PDL and FoM compared to the 2-coil link and also showed how the optimizing parameter FoM changes with the increase of quality factor of primary coil for both inductive link WPT system. At ISM Band 13.56MHz carrier frequency and 12cm coupling distance, 2-coil and 3-coil inductive links have PTE of 11.68%, 48.32% respectively and PDL of 0.318W, 0.761W respectively. The FoM of 2-coil and 3-coil inductive links showed 0.149W, 2.03W respectively at 12cm coupling distance. These results have been verified through simulated data. Index Terms-Wireless power transmission, power transfer efficiency, power delivered to the load, figure of merit.
Scroggie of the MOODY BIBLE INSTITUTE, Chicago, one of the most prestigious Christian Evangelical... more Scroggie of the MOODY BIBLE INSTITUTE, Chicago, one of the most prestigious Christian Evangelical Mission in the world, answering the question-"Is the Bible the Word of God?" (also the title of his book), under the heading: IT IS HUMAN, YET DIVINE. He says on page 17: "Yes, the Bible is human, though some, out of zeal which is not according to knowledge, 1 have denied this. Those books 2 have passed through the minds of men, are written in the language of men, were penned by the hands of men, and bear in their style the characteristics of men." (Emphasis added).
The use of general descriptive names, registered names, trademarks, etc. in this publication does... more The use of general descriptive names, registered names, trademarks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use.
This publication is in copyright. Subject to statutory exception and to the provision of relevant... more This publication is in copyright. Subject to statutory exception and to the provision of relevant collective licensing agreements, no reproduction of any part may take place without the written permission of Cambridge University Press.
The use of general descriptive names, registered names, trademarks, etc. in this publication does... more The use of general descriptive names, registered names, trademarks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use.
Muhammad which must not flow together, but each in its own course; and he entrusted Hagar and Ish... more Muhammad which must not flow together, but each in its own course; and he entrusted Hagar and Ishmael to the blessing of God and the care of His Angels in the certainty that all would be well with them. Two spiritual streams, two religions, two worlds for God; two circles, therefore two centres. A place is never holy through the choice of man, but because it has been chosen in Heaven. There were two holy centres within the orbit of Abraham: one of these was at hand, the other perhaps he did not y~t know; and it was to the other that Hagar and Ishmael were guided, in a barren valley of Arabia, some forty camel days south of Canaan. The valley was named Becca, some say on account of its narrowness: hills surround it on all sides except for three passes, one to the north, one to the south, and one opening towards the Red Sea which is fifty miles to the west. The Books do not tell us how Hagar and her son reached Becca; perhaps some travellers took care of them, for the valley was on one of the great caravan routes, sometimes called "the incense route", because perfumes and incense and such wares were brought that way from South Arabia to the Mediterranean; and no doubt Hagar was guided to leave the caravan, once the place was reached. It was not long before both mother and son were overcome by thirst, to the point that Hagar feared Ishmael was dying. According to the traditions of their descendants, he cried out to God from where he lay in the sand, and his mother stood on a rock at the foot of a nearby eminence to see if any help was in sight. Seeingno one, she hastened to another point of vantage, but from there likewise not a soul was to be seen. Half distraught, she passed seven times in all between the two points, until at the end of her seventh course, as she sat for rest on the further rock, the Angel spoke to her. Inthe words of Genesis: And God heard the voice of the lad; and the angel of God called to Hagar out ofheaven and said to her: What aileth thee, Hagar? Fear not, for God hath heard the voice of the lad where he is. Arise and lift up the lad and hold him in thy hand, for I will make him a great nation. And God opened her eyes, and she saw a well ofwater,' I :1.1: 17-2 0 • 2 ibid.
The titles published in this series are listed at brill.com/mumi
