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Sajjad Mohammadi - IEEE Xplore Author Profile
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Sajjad Mohammadi

Also published under: S. Mohammadi

Publications
20
Citations
343
Publications by Year
20142024
Co-Authors:
Show All Co-Authors (20)
Image of author Sajjad Mohammadi

Sajjad Mohammadi

Also published under: S. Mohammadi

Affiliation

Department of Electrical Engineering and Computer Science
MIT
Cambridge, USA

Publication Topics

Biography

Sajjad Mohammadi (Student Member, IEEE) received the B.S. degree (Hons.) from the Kermanshah University of Technology, Kermanshah, Iran, in 2011 and the M.S. degree (Hons.) from the Amirkabir University of Technology, Tehran, in 2014, all in electrical engineering. He also received the M.S. degree in electrical engineering and computer science from the Massachusetts Institute of Technology (MIT), Cambridge, MA, where he is currently working toward the Ph.D. degree. His research interests include energy conversion, design and control of electromechanical devices and electric machines, drives, power electronics, power systems, and energy policy.,He attained a number of awards such as Best M.Sc. Thesis Awards from IEEE Iran Section and Amirkab...
Publications
20
Citations
343
Publications by Year
20142024
Co-Authors:
Show All Co-Authors (20)
Author's Published Works

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A New Switched Reluctance Motor with Embedded Permanent Magnets for Transportation Electrification

Gholamreza Davarpanah;Sajjad Mohammadi

IECON 2024 - 50th Annual Conference of the IEEE Industrial Electronics Society
Year: 2024 | Conference Paper |
A new three-phase hybrid-excited multi-tooth switched reluctance motor with embedded permanent magnets is proposed, capable of achieving higher torque density for transportation electrification applications. Operating principles and design considerations are discussed. A magnetic equivalent circuit is developed. Finite element method is employed in the field analysis. The advantages of the propose...Show More

A New Switched Reluctance Motor with Embedded Permanent Magnets for Transportation Electrification

Gholamreza Davarpanah;Sajjad Mohammadi

Year: 2024 | Conference Paper |

Topology Optimization in Three-Phase C-Core SRMs

Gholamreza Davarpanah;Sajjad Mohammadi;James L. Kirtley

IECON 2024 - 50th Annual Conference of the IEEE Industrial Electronics Society
Year: 2024 | Conference Paper |
This paper investigates the optimized combination of rotor and stator teeth in a three-phase switched reluctance motor featuring a connected C-core topology to attain a larger winding area and, thus, a higher electrical loading capability, leading to a higher torque density. The general formulation is discussed. Additionally, the shorter flux path within the design leads to a reduced core loss. Th...Show More

Topology Optimization in Three-Phase C-Core SRMs

Gholamreza Davarpanah;Sajjad Mohammadi;James L. Kirtley

Year: 2024 | Conference Paper |

A Novel Radial-Flux IPM Eddy-Current Coupler for Slip-Synchronous PM Wind Generators

Sajjad Mohammadi;Gholamreza Davarpanah;James L. Kirtley

2024 IEEE Energy Conversion Congress and Exposition (ECCE)
Year: 2024 | Conference Paper |
A novel radial-flux eddy-current coupler with interior permanent magnets (IPM) is proposed, providing higher demagnetization tolerance, making it well-suited for applications with limited accessibility, such as offshore slip-synchronous PM wind generators for which a new compact topology is offered by unifying coupler and generator. FEM is employed in design and derivation of coupler quantities. F...Show More

A Novel Radial-Flux IPM Eddy-Current Coupler for Slip-Synchronous PM Wind Generators

Sajjad Mohammadi;Gholamreza Davarpanah;James L. Kirtley

Year: 2024 | Conference Paper |

An Actuator With Magnetic Restoration, Part I: Electromechanical Model and Identification

Sajjad Mohammadi;William R. Benner;James L. Kirtley;Jeffrey H. Lang

IEEE Transactions on Energy Conversion
Year: 2024 | Volume: 39, Issue: 4 | Journal Article |
Cited by: Papers (1)
Electromechanical models are crucial in the design and control of motors and actuators. Modeling, identification, drive, and current control loop of a limited-rotation actuator with magnetic restoration is presented. New nonlinear and linearized electromechanical models are developed for the design of the drive as well as small and large signal controls of the actuator. To attain a higher accuracy...Show More

An Actuator With Magnetic Restoration, Part I: Electromechanical Model and Identification

Sajjad Mohammadi;William R. Benner;James L. Kirtley;Jeffrey H. Lang

Year: 2024 | Volume: 39, Issue: 4 | Journal Article |

An Actuator With Magnetic Restoration, Part II: Drive Circuit and Control Loops

Sajjad Mohammadi;William R. Benner;James L. Kirtley;Jeffrey H. Lang

IEEE Transactions on Energy Conversion
Year: 2024 | Volume: 39, Issue: 4 | Journal Article |
In part II, an op-amp-based drive is proposed and designed. Subsequently, a very accurate model for the drive circuit and the current loop is developed as a simulation platform, while its simplified version is derived, tailored for efficient design purposes. Through a comprehensive evaluation, the accuracy and efficacy of both the actuator and drive circuit modeling is scrutinized, showcasing thei...Show More

An Actuator With Magnetic Restoration, Part II: Drive Circuit and Control Loops

Sajjad Mohammadi;William R. Benner;James L. Kirtley;Jeffrey H. Lang

Year: 2024 | Volume: 39, Issue: 4 | Journal Article |

Modeling of a Rotary Actuator Using Elliptical Coordinates and Differential Flux Tubes

Sajjad Mohammadi;James L. Kirtley;Jeffrey H. Lang

IEEE Transactions on Magnetics
Year: 2023 | Volume: 59, Issue: 2 | Journal Article |
Cited by: Papers (1)
Analytical models are useful in the design of electromagnetic devices. In this article, a model is developed for a rotary actuator whose stator curvature is elliptically shaped to have a reluctance torque that restores the rotor to the maximum torque per ampere position. The total torque is decomposed into the coil torque and a reluctance torque. The rotor is a permanent magnet represented by equi...Show More

Modeling of a Rotary Actuator Using Elliptical Coordinates and Differential Flux Tubes

Sajjad Mohammadi;James L. Kirtley;Jeffrey H. Lang

Year: 2023 | Volume: 59, Issue: 2 | Journal Article |

A Self-Starting Technique for Two-Phase Switched Reluctance Motors

Gholamreza Davarpanah;Jawad Faiz;Sajjad Mohammadi;James L. Kirtley

IEEE Transactions on Energy Conversion
Year: 2022 | Volume: 37, Issue: 2 | Journal Article |
Cited by: Papers (10)
Special attention has been paid to two-phase switched reluctance motors (SRMs) as they have fewer power electronics components compared to three- or multi-phase ones. However, their main drawbacks are the lack of starting torque and a predetermined direction of rotation. This paper proposes a new self-starting technique for two-phase SRMs, which has superiorities over the previous approaches. In t...Show More

A Self-Starting Technique for Two-Phase Switched Reluctance Motors

Gholamreza Davarpanah;Jawad Faiz;Sajjad Mohammadi;James L. Kirtley

Year: 2022 | Volume: 37, Issue: 2 | Journal Article |

Robust 3-D Wireless Power Transfer System Based on Rotating Fields for Multi-User Charging

Nelson Xuntuo Wang;Han-Wei Wang;Jie Mei;Sajjad Mohammadi;Jinyeong Moon;Jeffrey H. Lang;James L. Kirtley

IEEE Transactions on Energy Conversion
Year: 2021 | Volume: 36, Issue: 2 | Journal Article |
Cited by: Papers (14)
A wireless power transfer system for multi-user charging is proposed to demonstrate a robust quasi-uniform power efficiency in a 3-D space. It employs a set of balanced magnetic coils excited with phase-shifted currents on the transmitting side to feature omnidirectionality. In this article, two transmitter structures, 2-coil and 3-coil systems are discussed and compared. These systems produce a q...Show More

Robust 3-D Wireless Power Transfer System Based on Rotating Fields for Multi-User Charging

Nelson Xuntuo Wang;Han-Wei Wang;Jie Mei;Sajjad Mohammadi;Jinyeong Moon;Jeffrey H. Lang;James L. Kirtley

Year: 2021 | Volume: 36, Issue: 2 | Journal Article |

A Novel 8/10 Two-Phase Switched Reluctance Motor With Enhanced Performance: Analysis and Experimental Study

Gholamreza Davarpanah;Sajjad Mohammadi;James L. Kirtley

IEEE Transactions on Industry Applications
Year: 2019 | Volume: 55, Issue: 4 | Journal Article |
Cited by: Papers (17)
A novel 8/10 two-phase switched reluctance motor is proposed. Thanks to this unique design, the flux paths are shortened, resulting in lower magnetomotive force requirements. There is no negative torque, bringing a higher total torque. The space is more effectively utilized to provide a higher torque density. Flux reversals in the iron cores are reduced, causing a significantly lower loss. The ass...Show More

A Novel 8/10 Two-Phase Switched Reluctance Motor With Enhanced Performance: Analysis and Experimental Study

Gholamreza Davarpanah;Sajjad Mohammadi;James L. Kirtley

Year: 2019 | Volume: 55, Issue: 4 | Journal Article |

A Novel 8/10 Two-Phase Switched Reluctance Motor with Enhanced Performance

Gholamreza Davarpanah;Sajjad Mohammadi;James L. Kirtley

2018 IEEE Industry Applications Society Annual Meeting (IAS)
Year: 2018 | Conference Paper |
Cited by: Papers (11)
A novel 8/10 two-phase switched reluctance motor is proposed. Thanks to this unique design, the flux paths are shortened, resulting in lower magneto motive force requirements. There is no negative torque, bringing a higher total torque. The space is more effectively utilized to provide a higher torque density. Flux reversals in the iron cores are reduced, causing a significantly lower loss. The as...Show More

A Novel 8/10 Two-Phase Switched Reluctance Motor with Enhanced Performance

Gholamreza Davarpanah;Sajjad Mohammadi;James L. Kirtley

Year: 2018 | Conference Paper |

A soccer playing humanoid robot: Design, algorithm and prototype

S. Mohammadi;H. A. Talebi;M. A. Soleimani;M. Mirsalim;S. Asgari

2014 Second RSI/ISM International Conference on Robotics and Mechatronics (ICRoM)
Year: 2014 | Conference Paper |
Cited by: Papers (1)
Humanoid robots play an important role in the future life. The main contribution of this paper is to design and prototype a humanoid robot that is going to be employed in the study of such systems as well as robotics competitions. Eighteen servomotors are utilized as the actuators. A camera sensor is used to get visual feedback. An accelerometer sensor is utilized to determine the physical state o...Show More

A soccer playing humanoid robot: Design, algorithm and prototype

S. Mohammadi;H. A. Talebi;M. A. Soleimani;M. Mirsalim;S. Asgari

Year: 2014 | Conference Paper |

Analytical framework for analysis and demagnetization study of a slotted solid-rotor line-start permanent-magnet synchronous motor

M. Niazazari;M. Mirsalim;S. Mohammadi

The 5th Annual International Power Electronics, Drive Systems and Technologies Conference (PEDSTC 2014)
Year: 2014 | Conference Paper |
Cited by: Papers (8)
Slotted solid rotor line-start permanent magnet motor can synchronize well in high load torques and high moment of inertias. In this paper, a magnetic equivalent circuit model (MEC) of a slotted solid rotor line-start permanent magnet motor is developed, whereby main characteristics of the device with an emphasis on the demagnetization withstand capability of PMs, are analyzed. It is shown that th...Show More

Analytical framework for analysis and demagnetization study of a slotted solid-rotor line-start permanent-magnet synchronous motor

M. Niazazari;M. Mirsalim;S. Mohammadi

Year: 2014 | Conference Paper |

A new interior permanent-magnet radial-flux eddy-current coupler

S. Mohammadi;M. Mirsalim;M. Niazazari;H. A. Talebi

The 5th Annual International Power Electronics, Drive Systems and Technologies Conference (PEDSTC 2014)
Year: 2014 | Conference Paper |
Cited by: Papers (6)
Herein, a rotating interior permanent-magnet radial-flux eddy-current coupler is studied. In the proposed coupler, permanent-magnets (PMs) located inside the inner rotating part of the coupler are orthogonal to the air-gap, and a copper sheet is paced on the inner surface of the outer rotating part. It is worth noting that in this structure, besides utilizing the rectangular-shaped PM, there is no...Show More

A new interior permanent-magnet radial-flux eddy-current coupler

S. Mohammadi;M. Mirsalim;M. Niazazari;H. A. Talebi

Year: 2014 | Conference Paper |

A neural network based saturation model for dynamic modeling of synchronous machines

S. Mohammadi;M. Mirsalim;H. Rastegar;H. Lesani;B. Vahidi

The 5th Annual International Power Electronics, Drive Systems and Technologies Conference (PEDSTC 2014)
Year: 2014 | Conference Paper |
Cited by: Papers (1)
This paper presents a new approach for modeling saturated synchronous machines by employing multi-layer neural networks. In the proposed model, Park's equations are used as fundamental state-space system in which stator quantities are referred to rotor reference frame and winding fluxes are considered as state variables. Magnetic saturation is also taken into account in both d- and q-axes. First, ...Show More

A neural network based saturation model for dynamic modeling of synchronous machines

S. Mohammadi;M. Mirsalim;H. Rastegar;H. Lesani;B. Vahidi

Year: 2014 | Conference Paper |

Sensitivity analysis and prototyping of a surface-mounted permanent-magnet axial-flux coupler

S. Mohammadi;M. Mirsalim;S. Vaez-Zadeh;H. Lesani

The 5th Annual International Power Electronics, Drive Systems and Technologies Conference (PEDSTC 2014)
Year: 2014 | Conference Paper |
Cited by: Papers (5)
In this paper, the performance of an axial-flux eddy-current coupler is analyzed, designed and prototyped, for which a magnetic equivalent circuit model is also developed. A number of associated design considerations are also presented. The studied structure utilizes annular-shaped PMs that better uses the space provided. Three dimensional time-stepping finite-element method is employed in the ana...Show More

Sensitivity analysis and prototyping of a surface-mounted permanent-magnet axial-flux coupler

S. Mohammadi;M. Mirsalim;S. Vaez-Zadeh;H. Lesani

Year: 2014 | Conference Paper |

Design analysis of a new axial-flux interior permanent-magnet coupler

S. Mohammadi;M. Mirsalim;S. Vaez-Zadeh;H. A. Talebi

The 5th Annual International Power Electronics, Drive Systems and Technologies Conference (PEDSTC 2014)
Year: 2014 | Conference Paper |
Cited by: Papers (11)
In this paper, performance of a new axial-flux interior permanent-magnet eddy-current coupler is analyzed, for which a magnetic equivalent circuit is also developed. The design considerations of the device are also presented. The proposed structure have advantageous over the couplers with surface-mounted PMs, e.g., the PMs are protected by the frame, there is no centrifugal force on PMs, the react...Show More

Design analysis of a new axial-flux interior permanent-magnet coupler

S. Mohammadi;M. Mirsalim;S. Vaez-Zadeh;H. A. Talebi

Year: 2014 | Conference Paper |

Sensitivity analysis and performance optimization of an industrial squirrel-cage induction motor used for a 150 HP floating pump

A. Vakilian-Zand;S. Mohammadi;J. S. Moghani;M. Mirsalim

The 5th Annual International Power Electronics, Drive Systems and Technologies Conference (PEDSTC 2014)
Year: 2014 | Conference Paper |
Cited by: Papers (1)
Performance optimization is usually an important issue in the design of industrial electric machines. In this paper, a 150 HP induction motor utilized in an industrial floating pump is analyzed and optimized for an enhanced efficiency, a higher power factor, reduced losses and an increased power to weight ratio. Also, two-dimensional time-stepping finite element method (2-D TSFEM) is employed in t...Show More

Sensitivity analysis and performance optimization of an industrial squirrel-cage induction motor used for a 150 HP floating pump

A. Vakilian-Zand;S. Mohammadi;J. S. Moghani;M. Mirsalim

Year: 2014 | Conference Paper |

Analytical Modeling and Analysis of Axial-Flux Interior Permanent-Magnet Couplers

Sajjad Mohammadi;Mojtaba Mirsalim;Sadegh Vaez-Zadeh;Heidar Ali Talebi

IEEE Transactions on Industrial Electronics
Year: 2014 | Volume: 61, Issue: 11 | Journal Article |
Cited by: Papers (111)
Analytical calculations are effective in preliminary design stages and analysis of electric machines. In this paper, for axial-flux interior permanent-magnet (PM) eddy-current couplers, an analytical model is developed, which is able to deal with the complex machine geometry and take into account material properties such as iron saturation and PM characteristics. The design considerations of the m...Show More

Analytical Modeling and Analysis of Axial-Flux Interior Permanent-Magnet Couplers

Sajjad Mohammadi;Mojtaba Mirsalim;Sadegh Vaez-Zadeh;Heidar Ali Talebi

Year: 2014 | Volume: 61, Issue: 11 | Journal Article |

Nonlinear Modeling of Eddy-Current Couplers

Sajjad Mohammadi;Mojtaba Mirsalim;Sadegh Vaez-Zadeh

IEEE Transactions on Energy Conversion
Year: 2014 | Volume: 29, Issue: 1 | Journal Article |
Cited by: Papers (99)
Analytical models play an important role in the design of electromagnetic devices by providing computationally efficient solutions. In this paper, by combining magnetic equivalent circuit approaches and Faraday's and Ampere's laws, a model for radial-flux eddy-current couplers is developed, which can easily handle complex geometries as well as account for iron saturation, all material properties, ...Show More

Nonlinear Modeling of Eddy-Current Couplers

Sajjad Mohammadi;Mojtaba Mirsalim;Sadegh Vaez-Zadeh

Year: 2014 | Volume: 29, Issue: 1 | Journal Article |

Analytical Design Framework for Torque and Back-EMF Optimization, and Inductance Calculation in Double-Rotor Radial-Flux Air-Cored Permanent-Magnet Synchronous Machines

Sajjad Mohammadi;Mojtaba Mirsalim

IEEE Transactions on Magnetics
Year: 2014 | Volume: 50, Issue: 1 | Journal Article |
Cited by: Papers (46)
Analytical models have been demonstrated to be effective tools in the analysis of electromagnetic devices by providing fast, yet accurate solutions. In this paper, a comprehensive analytical framework for double-rotor radial-flux air-cored permanent-magnet (PM) machines is developed whereby the average as well as the torque ripples, back-electromotive force (EMF) waveforms, air-gap flux density di...Show More

Analytical Design Framework for Torque and Back-EMF Optimization, and Inductance Calculation in Double-Rotor Radial-Flux Air-Cored Permanent-Magnet Synchronous Machines

Sajjad Mohammadi;Mojtaba Mirsalim

Year: 2014 | Volume: 50, Issue: 1 | Journal Article |

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