Patents by Inventor Mohammad S. Islam
Mohammad S. Islam 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).
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Publication number: 20120126654Abstract: A permanent magnet brushless motor is provided. The motor includes a stator having a tubular-shaped member and a plurality of tooth members extending radially inwardly from the tubular-shaped member. Each tooth member has an arcuate-shaped convex surface disposed proximate to an interior region defined by the stator. Each arcuate-shaped convex surface is defined by a first radius that is rotated about a respective center point that is disposed radially outside of the stator. The motor further includes a rotor disposed within the interior region of the stator.Type: ApplicationFiled: October 3, 2011Publication date: May 24, 2012Applicant: NEXTEER (BEIJING) TECHNOLOGY CO., LTD.Inventors: Mohammad S. Islam, Mohammed Rakibul Islam
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Patent number: 8013696Abstract: The present invention provides for a magnetic apparatus and a method of manufacturing the magnetic apparatus including a magnet having an outer surface and an inner surface opposing each other with the inner surface having a first portion and a second portion integrally connected to and facing each other and utilizing a fluid and a fixture body defining a hole along a fixture axis and a deflector disposed within the hole. The method includes the steps of installing the magnet on the fixture body and securing the magnet to the fixture body. The method further includes the steps of flowing the fluid through the magnet transverse to the fixture axis to form at least one aperture and intersecting the fluid with the deflector to redirect the fluid generally along the fixture axis.Type: GrantFiled: October 14, 2008Date of Patent: September 6, 2011Inventors: Raghunath P. Khetan, Mohammad S. Islam, Matt Mielke, Brian J. Magnus, Tomy Sebastian, Charmaine Wittig, William D. Glumm, Joe Koscielecki
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Patent number: 8011265Abstract: A power actuator assembly includes a torque transmission device, a motor mounted to the torque transmission device extending along a motor axis, and a screw coupled to the torque transmission device and extending along a screw axis. An adjustment mechanism interconnects the screw and the torque transmission device and permits selective rotational adjustment between the adjustment mechanism and the torque transmission device to rotate the motor relative to the torque transmission device. A connecting device releasably interconnects the adjustment mechanism to the torque transmission device to permit repeated re-positioning of the motor relative to the torque transmission device.Type: GrantFiled: February 11, 2008Date of Patent: September 6, 2011Inventors: Ratko Menjak, Brian J. Magnus, Steven M. Thomas, Thomas A. Barrett, Mohammad S. Islam, Karen A. Boswell, David K. Siniff, Michael A. Tomasino, James E. Rouleau, Steven J. Schultz
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Patent number: 7898139Abstract: A magnetic actuator, comprising, an inner ring, an outer ring disposed around the inner ring, a first pair of inner teeth disposed on the inner ring that partially define a gap between the first pair of inner teeth having a first angular dimension, a second pair of inner teeth disposed on the inner ring that partially define a gap between the second pair of inner teeth having a second angular dimension, a first pair of outer teeth disposed on the outer ring that partially define a gap between the first pair of outer teeth having a third angular dimension and a second pair of outer teeth disposed on the outer ring that partially define a gap between the second pair of outer teeth having a fourth angular dimension.Type: GrantFiled: August 7, 2008Date of Patent: March 1, 2011Inventors: Mohammad S. Islam, Joel E. Birsching, Tomy Sebastian
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Publication number: 20100180696Abstract: A torque sensor system comprising, an inner tooth, an outer tooth disposed on an outer yoke member centered on an axis spaced radially from the inner tooth, a plate member, a retainer member operative to retain the outer yoke member and the plate member, a magnet member centered on the axis disposed between the inner tooth and the outer tooth, an air gap partially defined by the plate member and the outer yoke member, and a magnetosensitive element disposed in the air gap operative to sense a magnetic flux induced by an angular displacement of the magnet member relative to the inner tooth and the outer tooth.Type: ApplicationFiled: January 16, 2009Publication date: July 22, 2010Applicant: DELPHI TECHNOLOGIES INC.Inventors: Mohammad S. Islam, Mohammed R. Islam, Matt Mielke
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Publication number: 20100156226Abstract: A brush type motor including a stator having at least one magnet with an inner circumferential surface is provided. The inner circumferential surface is defined by a first radius orthogonally extending from a first axially extending centerline. The motor has an armature disposed within an interior region of the stator having teeth. Each tooth has an arcuate surface defined by a second radius orthogonally extending from a second axially extending centerline. At least one tooth is radially closer to the inner circumferential surface than the teeth adjacent to the at least one tooth. Each tooth further includes at least one dummy notch extending into the tooth. The first axially extending centerline is in a first position different than a second position of the second axially extending centerline.Type: ApplicationFiled: December 18, 2009Publication date: June 24, 2010Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.Inventors: Mohammad S. Islam, Matthew W. Mielke, Christian Ross
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Publication number: 20100147619Abstract: An actuator assembly including, a polar assembly including an inner tooth and an outer tooth, and a magnet disposed between the inner tooth and the outer tooth, the magnet operative to interact with the polar assembly to induce an electromagnetic torsion bar operative to impart a torque on a first shaft connected to the ring magnet.Type: ApplicationFiled: December 12, 2008Publication date: June 17, 2010Applicant: DELPHI TECHNOLOGIES INC.Inventors: Ashok Chandy, Mohammad S. Islam
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Patent number: 7721616Abstract: Disclosed herein is an apparatus that relates to a gear set. The apparatus includes, a housing, a first gear movable in the housing such that a first axis defined by the first gear is repositionable relative to the housing, a second gear in mesh with the first gear, and a second axis defined by the second gear. The apparatus constrains movement of the first axis to a plane containing both the first axis and a line commonly perpendicular to the first axis and the second axis, and a biasing member that urges the first gear toward the second gear.Type: GrantFiled: November 6, 2006Date of Patent: May 25, 2010Assignee: GM Global Technology Operations, Inc.Inventors: Michael J. Augustine, Christian E. Ross, Steven J. Collier-Hallman, Mohammad S. Islam
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Publication number: 20100089686Abstract: The present invention provides for a magnetic apparatus and a method of manufacturing the magnetic apparatus including a magnet having an outer surface and an inner surface opposing each other with the inner surface having a first portion and a second portion integrally connected to and facing each other and utilizing a fluid and a fixture body defining a hole along a fixture axis and a deflector disposed within the hole. The method includes the steps of installing the magnet on the fixture body and securing the magnet to the fixture body. The method further includes the steps of flowing the fluid through the magnet transverse to the fixture axis to form at least one aperture and intersecting the fluid with the deflector to redirect the fluid generally along the fixture axis.Type: ApplicationFiled: October 14, 2008Publication date: April 15, 2010Applicant: DELPHI TECHNOLOGIES, INC.Inventors: Raghunath P. Khetan, Mohammad S. Islam, Matt Mielke, Brian J. Magnus, Tomy Sebastian, Charmaine Wittig, William D. Glumm, Joe Koscielecki
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Patent number: 7659679Abstract: A system and a method for adjusting a dead-time interval between de-activating a first transistor and activating a second transistor in a motor control circuit are provided. The method includes determining a plurality of commanded torque values associated with a motor based on a received signal over time. The method further includes setting the dead-time interval value equal to a first value when one commanded torque value of the plurality of commanded torque values is within a first torque range. The method further includes decreasing the dead-time interval value as other commanded torque values of the plurality of commanded torque values increase over time within a second torque range. The second torque range is greater than the first torque range. The dead-time interval value is indicative of a desired dead-time interval.Type: GrantFiled: January 12, 2007Date of Patent: February 9, 2010Assignee: GM Global Technology Operations, Inc.Inventors: Ramakrishnan Raja, Mohammad S. Islam, Paul M. Fisher, Tomy Sebastian, Lucas W. Wendling
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Patent number: 7639004Abstract: An apparatus for measuring relative displacement between a first shaft and a second shaft includes first and second rotor assemblies. The first rotor assembly is coupled to the first shaft and is centered on an axis. The second rotor assembly is coupled to the second shaft. The second rotor assembly has first and second stator plates. Each of the first and second stator plates includes an upper surface and a lower surface. The first and second stator plates include a plurality of teeth extending in a direction radial of the axis. The apparatus further includes at least one magnet having a magnetic field and disposed on the first rotor assembly. The apparatus includes a flux collector arrangement having first and second collectors positioned adjacent the first and second stator plates, respectively, forming a gap. A sensing device disposed within the gap senses a magnetic flux of the magnetic field.Type: GrantFiled: July 23, 2007Date of Patent: December 29, 2009Assignee: GM Global Technology Operations, Inc.Inventors: Mohammed R. Islam, Mohammad S. Islam, Matthew W Mielke, Tomy Sebastian, Sainan Feng
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Publication number: 20090199667Abstract: A power actuator assembly includes a torque transmission device, a motor mounted to the torque transmission device extending along a motor axis, and a screw coupled to the torque transmission device and extending along a screw axis. An adjustment mechanism interconnects the screw and the torque transmission device and permits selective rotational adjustment between the adjustment mechanism and the torque transmission device to rotate the motor relative to the torque transmission device. A connecting device releasably interconnects the adjustment mechanism to the torque transmission device to permit repeated re-positioning of the motor relative to the torque transmission device.Type: ApplicationFiled: February 11, 2008Publication date: August 13, 2009Applicant: DELPHI TECHNOLOGIES, INC.Inventors: Ratko Menjak, Brian J. Magnus, Steven M. Thomas, Thomas A. Barrett, Mohammad S. Islam, Karen A. Boswell, David K. Siniff, Michael A. Tomasino, James E. Rouleau, Steven J. Schultz
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Publication number: 20090050398Abstract: A magnetic actuator, comprising, an inner ring, an outer ring disposed around the inner ring, a first pair of inner teeth disposed on the inner ring that partially define a gap between the first pair of inner teeth having a first angular dimension, a second pair of inner teeth disposed on the inner ring that partially define a gap between the second pair of inner teeth having a second angular dimension, a first pair of outer teeth disposed on the outer ring that partially define a gap between the first pair of outer teeth having a third angular dimension and a second pair of outer teeth disposed on the outer ring that partially define a gap between the second pair of outer teeth having a fourth angular dimension.Type: ApplicationFiled: August 7, 2008Publication date: February 26, 2009Applicant: DELPHI TECHNOLOGIES INC.Inventors: Mohammad S. Islam, Joel E. Birsching, Tomy Sebastian
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Publication number: 20090027045Abstract: An apparatus for measuring relative displacement between a first shaft and a second shaft includes first and second rotor assemblies. The first rotor assembly is coupled to the first shaft and is centered on an axis. The second rotor assembly is coupled to the second shaft. The second rotor assembly has first and second stator plates. Each of the first and second stator plates includes an upper surface and a lower surface. The first and second stator plates include a plurality of teeth extending in a direction radial of the axis. The apparatus further includes at least one magnet having a magnetic field and disposed on the first rotor assembly. The apparatus includes a flux collector arrangement having first and second collectors positioned adjacent the first and second stator plates, respectively, forming a gap. A sensing device disposed within the gap senses a magnetic flux of the magnetic field.Type: ApplicationFiled: July 23, 2007Publication date: January 29, 2009Inventors: Mohammed R. Islam, Mohammad S. Islam, Matthew W Mielke, Tomy Sebastian, Sainan Feng
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Patent number: 7474090Abstract: A position sensor assembly including a circular-shaped or rhombus-shaped magnet and at least one magnetic flux density sensor, such as a Hall effect sensor, wherein rotation of the magnet is detected by the at least one sensor. The magnet may be positioned coaxially with the longitudinal axis of a rotor shaft of a motor and provided within a support. A position extraction algorithm may be employed using the output from the sensors to detect the position of the rotor shaft.Type: GrantFiled: October 23, 2007Date of Patent: January 6, 2009Assignee: Delphi Technologies, Inc.Inventors: Mohammad S. Islam, Matthew Mielke, Tomy Sebastian
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Publication number: 20080314177Abstract: A method for designing a pole piece for a power assist steering system, includes: selecting a number of teeth, k, for the pole piece where k=n/2 and n represents an even number of poles; and selecting a ratio between an angle made by an inner tooth tip and an outer tooth tip, ?tp, and an angle made by a magnet pole width, ?mp, to provide a desired torque function for the steering system.Type: ApplicationFiled: June 19, 2008Publication date: December 25, 2008Applicant: DELPHI TECHNOLOGIES INC.Inventors: Mohammad S. Islam, Christian E. Ross, Matthew W. Mielke
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Publication number: 20080169777Abstract: A system and a method for adjusting a dead-time interval between de-activating a first transistor and activating a second transistor in a motor control circuit are provided. The method includes determining a plurality of commanded torque values associated with a motor based on a received signal over time. The method further includes setting the dead-time interval value equal to a first value when one commanded torque value of the plurality of commanded torque values is within a first torque range. The method further includes decreasing the dead-time interval value as other commanded torque values of the plurality of commanded torque values increase over time within a second torque range. The second torque range is greater than the first torque range. The dead-time interval value is indicative of a desired dead-time interval.Type: ApplicationFiled: January 12, 2007Publication date: July 17, 2008Inventors: Ramakrishnan Raja, Mohammad S. Islam, Paul M. Fisher, Tomy Sebastian, Lucas W. Wendling
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Publication number: 20080024028Abstract: An electric motor for reducing torque ripple includes a rotor, a plurality of magnets positioned about the rotor, and a stator including a plurality of stator teeth configured to form at least two slot openings each having a slot opening width wo and a slot opening height ho. One or more of the stator teeth include a dummy channel having a channel height wn and a channel width wb. At least one of the slot opening width wo, the slot opening height ho, the channel height wn, and the channel width wb, are selected so as to minimize or reduce cogging torque.Type: ApplicationFiled: July 27, 2006Publication date: January 31, 2008Inventors: Mohammad S. Islam, Paul M. Fisher, Tomy Sebastian, Ramakrishnan Raja Venkitasubramony, Tom C. Wong
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Patent number: 7307416Abstract: Disclosed herein, in an exemplary embodiment, is a position sensor assembly including a circular-shaped or rhombus-shaped magnet and at least one magnetic flux density sensor, such as a Hall effect sensor, wherein rotation of the magnet is detected by the at least one sensor. The magnet may be positioned coaxially with the longitudinal axis of a rotor shaft of a motor and provided within a support. A position extraction algorithm may be employed using the output from the sensors to detect the position of the rotor shaft.Type: GrantFiled: October 22, 2004Date of Patent: December 11, 2007Assignee: Delphi Technologies, Inc.Inventors: Mohammad S. Islam, Matthew Mielke, Tomy Sebastian
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Patent number: 7210360Abstract: An apparatus measures relative displacement between a first end and a second end of a shaft. The first and second ends being centered on a shaft axis. The apparatus includes first and second ferromagnetic plates. The first ferromagnetic plate has a first side and a second side and is connected to the first end. The first ferromagnetic plate is centered on the shaft axis and has a plurality of ferromagnetic teeth extending from the first side and in a first direction parallel to the shaft. The second ferromagnetic plate has a first side and a second side and is connected to the second end. The second ferromagnetic plate is centered on the shaft axis. The first and second ferromagnetic plates form a gap. The apparatus further includes a plurality of magnets having a magnetic field and a sensing device. The magnets are coupled to the first side of the second ferromagnetic plate. The sensing device is disposed within the gap for sensing a magnetic flux of the magnetic field.Type: GrantFiled: June 9, 2004Date of Patent: May 1, 2007Assignee: Delphi Technologies, Inc.Inventors: Thaddeus Schroeder, Shaotang Chen, Avoki M Omekanda, Thomas W Nehl, Bruno Lequesne, Mohammad S Islam