Patents by Inventor Shuvajit Das

Shuvajit Das has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 12231070
    Abstract: A method performed by a controller of an electric motor, including generating control parameters, the step of generating control parameters selected from: inputting a given reference torque (Tref) and a speed command to a torque generation lookup table (LUT) such that the step of generating the control parameters includes the torque generation lookup table at the given reference torque and the speed command; or utilizing an analytical model that includes one or more analytical equations or one or more functions; inputting the control parameters to a DC-link current ripple, torque ripple, and radial force ripple minimization lookup table; inputting position to the DC-link current ripple, torque ripple, and radial force ripple minimization lookup table; generating a reference current profile from the DC-link current ripple, torque ripple, and radial force ripple minimization lookup table; and inputting the reference current profile to the electric motor. Additional methods are disclosed.
    Type: Grant
    Filed: October 8, 2021
    Date of Patent: February 18, 2025
    Assignee: THE UNIVERSITY OF AKRON
    Inventors: Yilmaz Sozer, Omer Gundogmus, Md Ehsanul Haque, Anik Chowdhury, Shuvajit Das
  • Publication number: 20250015644
    Abstract: A transverse flux machine (TFM) includes: a rotor configured to rotate about an axis and having a plurality of pairs of permanent magnets, with flux concentrating and flux diverging cores alternatively placed between the permanent magnets, each of the pairs of permanent magnets arranged to generate a magnetic flux in a circumferential direction into the flux concentrating core and away from the flux diverging core; and a stator including a transverse flux core configured to direct the magnetic flux in each of a radial direction and an axial direction. The rotor further includes a non-magnetic material located between the permanent magnets of each of the pairs of the permanent magnets, adjacent to the flux concentrating core and opposite from the stator, the non-magnetic material having a thickness (TH) in a radial direction. A steer-by-wire system for a vehicle includes a handwheel actuator including a TFM coupled to a steering wheel.
    Type: Application
    Filed: June 10, 2024
    Publication date: January 9, 2025
    Inventors: Shuvajit Das, Alejandro J. Pina Ortega, Anik Chowdhury, Rong Yang
  • Publication number: 20240286669
    Abstract: A method for passive damping in a steer-by-wire handwheel actuator includes selecting a number of windings for a motor of a handwheel actuator; shorting a subset of windings of the number of windings, each winding of the subset of windings being disposed at an obtuse angle from each other winding of the subset of windings; determining a resistance value for the motor; selectively adjusting the resistance value based on a number of windings associated with the subset of windings; and providing, in series with the subset of windings, at least one metal-oxide-semiconductor field-effect transistor (MOSFET) configured to: vary the resistance associated with the subset of windings based on a vehicle speed; and tune a damping characteristic associated with the handwheel actuator.
    Type: Application
    Filed: February 27, 2024
    Publication date: August 29, 2024
    Inventors: Anik Chowdhury, Michael J. Bock, Shuvajit Das, Steven J. Collier-Hallman
  • Publication number: 20240227913
    Abstract: A method for passive damping in a steer-by-wire handwheel actuator. The method includes winding a first coil around a first tooth of a motor, winding a second coil around a first tooth of the motor, and shorting the second coil to one of an internal aspect of the motor and an external aspect of the motor.
    Type: Application
    Filed: October 19, 2023
    Publication date: July 11, 2024
    Inventors: Steven J. Collier-Hallman, Todd F. Jammer, Shuvajit Das
  • Publication number: 20240204637
    Abstract: A system includes an electric motor, a rotor associated with electric motor, a first pole of the rotor, and a first magnet stack associated with the first pole. The first magnet set includes a set of magnets disposed proximate the rotor arranged according to a skewed arrangement and including at least a first magnet having a first length, a second magnet having a second length, and a third magnet having a third length.
    Type: Application
    Filed: December 16, 2022
    Publication date: June 20, 2024
    Inventors: Shuvajit Das, Rakibul Islam, Mojtaba Bahrami Kouhshahi, Alejandro Pina Ortega
  • Publication number: 20240132140
    Abstract: A method for passive damping in a steer-by-wire handwheel actuator. The method includes winding a first coil around a first tooth of a motor, winding a second coil around a first tooth of the motor, and shorting the second coil to one of an internal aspect of the motor and an external aspect of the motor.
    Type: Application
    Filed: October 18, 2023
    Publication date: April 25, 2024
    Inventors: Steven J. Collier-Hallman, Todd F. Jammer, Shuvajit Das
  • Publication number: 20240001986
    Abstract: A apparatus may be configured to select a number of windings for a motor of a handwheel actuator; short a subset of windings of the number of windings; determine a resistance value for the motor; and selectively adjust, based on a number of windings associated with the subset of windings and to tune a damping characteristic associated with the handwheel actuator, the resistance value by varying at least one of (i) a number of winding turns associates with the subset of windings, (ii) a wire diameter of associated with the subset of windings, (iii) a number of wires associated with the subset of windings and (iv) a material associated with the subset of windings.
    Type: Application
    Filed: June 29, 2023
    Publication date: January 4, 2024
    Inventors: Shuvajit Das, Rakibul Islam, Dennis B. Skellenger, Steven J. Collier-Hallman
  • Publication number: 20230378892
    Abstract: A method performed by a controller of an electric motor, including generating control parameters, the step of generating control parameters selected from: inputting a given reference torque (Tref) and a speed command to a torque generation lookup table (LUT) such that the step of generating the control parameters includes the torque generation lookup table at the given reference torque and the speed command; or utilizing an analytical model that includes one or more analytical equations or one or more functions; inputting the control parameters to a DC-link current ripple, torque ripple, and radial force ripple minimization lookup table; inputting position to the DC-link current ripple, torque ripple, and radial force ripple minimization lookup table; generating a reference current profile from the DC-link current ripple, torque ripple, and radial force ripple minimization lookup table; and inputting the reference current profile to the electric motor. Additional methods are disclosed.
    Type: Application
    Filed: October 8, 2021
    Publication date: November 23, 2023
    Inventors: Yilmaz Sozer, Omer Gundogmus, Md Ehsanul Haque, Anik Chowdhury, Shuvajit Das
  • Patent number: 11316390
    Abstract: A transverse flux machine includes a stator assembly consisting of a plurality of shaped cores, each having a base with a plurality of legs with a corresponding gap between each leg and each leg having a winding. A rotor assembly is positioned adjacent the stator assembly and includes a rotor disc, and a rotor ring with a plurality of rotor poles interleaved with a plurality of interpoles. The plurality of rotor poles and plurality of interpoles are radially disposed around the rotor disc. The plurality of rotor poles include a plurality of focused rotor poles interleaved with a plurality of diffused rotor poles.
    Type: Grant
    Filed: February 4, 2020
    Date of Patent: April 26, 2022
    Assignee: The University of Akron
    Inventors: Yilmaz Sozer, Anik Chowdhury, Shuvajit Das, Naoto Saito, Subrata Saha, Takamasa Takeuchi, Yasunobu Shiotsuki, Teppei Tsuda
  • Patent number: 11050700
    Abstract: Methods, systems, and devices for analyzing communication messages (e.g., emails) and selecting corresponding actions are described. In some database systems, a user may receive multiple messages at a user device. To efficiently determine responses to these messages, the user device may send the messages to a backend server for analysis. The server may perform natural language processing (NLP) to classify the message with one or more binary classifications and may extract metadata from each message. Based on the classifications and the metadata, the server may determine one or more actions the user device may perform to respond to each message. The server may send instructions to the user device indicating the suggested actions, and the user device may display these actions as options to a user. Additionally, the user device may use the classifications and metadata to automatically generate one or more communication templates in response to the message.
    Type: Grant
    Filed: November 3, 2017
    Date of Patent: June 29, 2021
    Assignee: salesforce.com, inc.
    Inventors: William Christopher Fama Roller, Shardul Vikram, Alex Michael Noe, Noah William Burbank, Sammy Adnan Nammari, Ascander Dost, Shuvajit Das, Oliver Qian Tang, Robert Christopher Ames, Madhav Vaidyanathan, Wing Hing Ku, Bhaskar Garg, Xu Yang, Madeleine Mary Gill, Percy Dara Mehta, Janelle Wen Hui Teng, Abraham Dio Suharli, Alexis Roos, Wenhao Liu, Nelson Esteban Acevedo, Joseph Gerald Keller, Rohit Deshpande, Sandeep Raju Prabhakar
  • Publication number: 20210075276
    Abstract: A transverse flux machine includes a stator assembly consisting of a plurality of shaped cores, each having a base with a plurality of legs with a corresponding gap between each leg and each leg having a winding. A rotor assembly is positioned adjacent the stator assembly and includes a rotor disc, and a rotor ring with a plurality of rotor poles interleaved with a plurality of interpoles. The plurality of rotor poles and plurality of interpoles are radially disposed around the rotor disc. The plurality of rotor poles include a plurality of focused rotor poles interleaved with a plurality of diffused rotor poles.
    Type: Application
    Filed: February 4, 2020
    Publication date: March 11, 2021
    Inventors: Yilmaz SOZER, Anik CHOWDHURY, Shuvajit DAS, Naoto SAITO, Subrata SAHA, Takamasa TAKEUCHI, Yasunobu SHIOTSUKI, Teppei TSUDA
  • Publication number: 20190140995
    Abstract: Methods, systems, and devices for analyzing communication messages (e.g., emails) and selecting corresponding actions are described. In some database systems, a user may receive multiple messages at a user device. To efficiently determine responses to these messages, the user device may send the messages to a backend server for analysis. The server may perform natural language processing (NLP) to classify the message with one or more binary classifications and may extract metadata from each message. Based on the classifications and the metadata, the server may determine one or more actions the user device may perform to respond to each message. The server may send instructions to the user device indicating the suggested actions, and the user device may display these actions as options to a user. Additionally, the user device may use the classifications and metadata to automatically generate one or more communication templates in response to the message.
    Type: Application
    Filed: November 3, 2017
    Publication date: May 9, 2019
    Inventors: William Christopher Fama Roller, Shardul Vikram, Alex Michael Noe, Noah William Burbank, Sammy Adnan Nammari, Ascander Dost, Shuvajit Das, Oliver Qian Tang, Robert Christopher Ames, Madhav Vaidyanathan, Wing Hing Ku, Bhaskar Garg, Xu Yang, Madeleine Mary Gill, Percy Dara Mehta, Janelle Wen Hui Teng, Abraham Dio Suharli, Alexis Roos, Wenhao Liu, Nelson Esteban Acevedo, Joseph Gerald Keller, Rohit Deshpande, Sandeep Raju Prabhakar