Patents by Inventor Craig S. Ross

Craig S. Ross 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).

  • Publication number: 20200153299
    Abstract: A permanent magnet electric machine (PM machine) includes a rotor with rotatable magnets and a stator defining an air gap with the rotor. An actuator rotates the rotatable magnets at predetermined operating points through an angular distance sufficient for changing magnetic pole orientations of the rotatable magnets, and thus modifies magnetic flux linkage with stator windings across the air gap. Fixed magnets may be arranged around a circumference of the rotor. The actuator may be actively or passively driven. Flux-shunting elements are optionally disposed in the rotor to further modify the flux linkage. A gear set connected to torque transfer elements may be driven by the actuator to rotate the rotatable magnets. A vehicle includes drive wheels, a transmission, and the PM machine. A method controls magnetic flux linkage in the PM machine noted above.
    Type: Application
    Filed: January 16, 2020
    Publication date: May 14, 2020
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Shawn H. Swales, Khwaja M. Rahman, Craig S. Ross, Goro Tamai
  • Publication number: 20200106316
    Abstract: A permanent magnet electric machine (PM machine) for a vehicle or other system includes a rotor assembly, fixed permanent magnets, a stator, an actuator, and one or more repositionable/moveable flux-shunting elements. The flux-shunting element is repositioned to control flux at specific operating points of the PM machine. The rotor assembly has a rotor coaxially surrounding and coupled to a rotor shaft. The permanent magnets are mounted to or in the rotor, and the moveable flux-shunting element is positioned between the rotor shaft and a respective one of the permanent magnets. Inboard and outboard ends of each respective permanent magnet may be oriented toward the rotor shaft and stator, respectively. The actuator selectively positions the moveable flux-shunting element at one or more operating points of the PM machine to vary reluctance in a magnetic circuit formed by the stator and rotor assembly.
    Type: Application
    Filed: December 2, 2019
    Publication date: April 2, 2020
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Craig S. Ross, Khwaja M. Rahman, Goro Tamai, Shawn H. Swales
  • Patent number: 10578193
    Abstract: A transmission is connectable to an input member and includes an output transfer gear, first and second transmission input shaft members, first, second, and third countershaft members, first and second sleeve shafts, a plurality of co-planar gear sets, and a plurality of torque transmitting devices. The torque transmitting devices include a plurality of gears, synchronizer assemblies and a dual clutch assembly. The transmission is operable to provide at least one reverse speed ratio and a plurality of forward speed ratios between the input member and the output member.
    Type: Grant
    Filed: August 29, 2016
    Date of Patent: March 3, 2020
    Assignee: GM Global Technology Operaitons, LLC
    Inventors: Scott H. Wittkopp, Craig S. Ross
  • Patent number: 10581287
    Abstract: A permanent magnet electric machine (PM machine) includes a rotor with rotatable magnets and a stator defining an air gap with the rotor. An actuator rotates the rotatable magnets at predetermined operating points through an angular distance sufficient for changing magnetic pole orientations of the rotatable magnets, and thus modifies magnetic flux linkage with stator windings across the air gap. Fixed magnets may be arranged around a circumference of the rotor. The actuator may be actively or passively driven. Flux-shunting elements are optionally disposed in the rotor to further modify the flux linkage. A gear set connected to torque transfer elements may be driven by the actuator to rotate the rotatable magnets. A vehicle includes drive wheels, a transmission, and the PM machine. A method controls magnetic flux linkage in the PM machine noted above.
    Type: Grant
    Filed: January 2, 2018
    Date of Patent: March 3, 2020
    Assignee: GM Global Technology Operations LLC
    Inventors: Shawn H. Swales, Khwaja M. Rahman, Craig S. Ross, Goro Tamai
  • Patent number: 10557527
    Abstract: An electro-mechanical drive unit connectable with first and second motor/generators includes an output member, a stationary member, a gear-train, and a torque-transmitting device. The drive unit also includes a compound planetary gear arrangement having a ring gear structure, first and second sun gears, and a carrier structure. The gear arrangement includes first, second, third, and fourth junction points and has a double-pinion assembly having a first pinion gear in mesh with the first sun gear member and a second pinion gear in mesh with the first pinion gear and with the ring gear structure. The gear arrangement is operatively connected to the second motor/generator at the first junction point via the gear-train and to the first motor/generator at the fourth junction point. The output member is operatively connected to the second junction point. Furthermore, the torque-transmitting device is engageable to ground the third junction point to the stationary member.
    Type: Grant
    Filed: July 12, 2017
    Date of Patent: February 11, 2020
    Assignee: GM Global Technology Operations LLC
    Inventors: James D. Hendrickson, Craig S. Ross
  • Patent number: 10541578
    Abstract: A permanent magnet electric machine (PM machine) for a vehicle or other system includes a rotor assembly, fixed permanent magnets, a stator, an actuator, and one or more repositionable/moveable flux-shunting elements. The flux-shunting element is repositioned to control flux at specific operating points of the PM machine. The rotor assembly has a rotor coaxially surrounding and coupled to a rotor shaft. The permanent magnets are mounted to or in the rotor, and the moveable flux-shunting element is positioned between the rotor shaft and a respective one of the permanent magnets. Inboard and outboard ends of each respective permanent magnet may be oriented toward the rotor shaft and stator, respectively. The actuator selectively positions the moveable flux-shunting element at one or more operating points of the PM machine to vary reluctance in a magnetic circuit formed by the stator and rotor assembly.
    Type: Grant
    Filed: January 2, 2018
    Date of Patent: January 21, 2020
    Assignee: GM Global Technology Operations LLC
    Inventors: Shawn H. Swales, Khwaja M. Rahman, Goro Tamai, Craig S. Ross
  • Patent number: 10533640
    Abstract: A powertrain includes an electric motor and a first planetary gear stage having a first rotatable member drivingly connected to the electric motor and at least one second rotatable member. A second planetary gear stage includes a third rotatable member drivingly connected to the at least one second rotatable member and includes at least one fourth rotatable member. One of the third rotatable member and the at least one fourth rotatable member is connected to an output member. A passive one-way clutch and a selectable one-way clutch are associated with at least one of the first and second planetary gear stages for varying operation of the first and second planetary gear stages based upon an operation state of the selectable one-way clutch and a direction of rotation of the electric motor.
    Type: Grant
    Filed: July 5, 2017
    Date of Patent: January 14, 2020
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Joseph R. Littlefield, Craig S. Ross
  • Publication number: 20190207447
    Abstract: A permanent magnet electric machine (PM machine) includes a rotor with rotatable magnets and a stator defining an air gap with the rotor. An actuator rotates the rotatable magnets at predetermined operating points through an angular distance sufficient for changing magnetic pole orientations of the rotatable magnets, and thus modifies magnetic flux linkage with stator windings across the air gap. Fixed magnets may be arranged around a circumference of the rotor. The actuator may be actively or passively driven. Flux-shunting elements are optionally disposed in the rotor to further modify the flux linkage. A gear set connected to torque transfer elements may be driven by the actuator to rotate the rotatable magnets. A vehicle includes drive wheels, a transmission, and the PM machine. A method controls magnetic flux linkage in the PM machine noted above.
    Type: Application
    Filed: January 2, 2018
    Publication date: July 4, 2019
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Shawn H. Swales, Khwaja M. Rahman, Craig S. Ross, Goro Tamai
  • Publication number: 20190207446
    Abstract: A permanent magnet electric machine (PM machine) for a vehicle or other system includes a rotor assembly, fixed permanent magnets, a stator, an actuator, and one or more repositionable/moveable flux-shunting elements. The flux-shunting element is repositioned to control flux at specific operating points of the PM machine. The rotor assembly has a rotor coaxially surrounding and coupled to a rotor shaft. The permanent magnets are mounted to or in the rotor, and the moveable flux-shunting element is positioned between the rotor shaft and a respective one of the permanent magnets. Inboard and outboard ends of each respective permanent magnet may be oriented toward the rotor shaft and stator, respectively. The actuator selectively positions the moveable flux-shunting element at one or more operating points of the PM machine to vary reluctance in a magnetic circuit formed by the stator and rotor assembly.
    Type: Application
    Filed: January 2, 2018
    Publication date: July 4, 2019
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Shawn H. Swales, Khwaja M. Rahman, Goro Tamai, Craig S. Ross
  • Publication number: 20190017578
    Abstract: An electro-mechanical drive unit connectable with first and second motor/generators includes an output member, a stationary member, a gear-train, and a torque-transmitting device. The drive unit also includes a compound planetary gear arrangement having a ring gear structure, first and second sun gears, and a carrier structure. The gear arrangement includes first, second, third, and fourth junction points and has a double-pinion assembly having a first pinion gear in mesh with the first sun gear member and a second pinion gear in mesh with the first pinion gear and with the ring gear structure. The gear arrangement is operatively connected to the second motor/generator at the first junction point via the gear-train and to the first motor/generator at the fourth junction point. The output member is operatively connected to the second junction point. Furthermore, the torque-transmitting device is engageable to ground the third junction point to the stationary member.
    Type: Application
    Filed: July 12, 2017
    Publication date: January 17, 2019
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: James D. Hendrickson, Craig S. Ross
  • Publication number: 20190011018
    Abstract: A powertrain includes an electric motor and a first planetary gear stage having a first rotatable member drivingly connected to the electric motor and at least one second rotatable member. A second planetary gear stage includes a third rotatable member drivingly connected to the at least one second rotatable member and includes at least one fourth rotatable member. One of the third rotatable member and the at least one fourth rotatable member is connected to an output member. A passive one-way clutch and a selectable one-way clutch are associated with at least one of the first and second planetary gear stages for varying operation of the first and second planetary gear stages based upon an operation state of the selectable one-way clutch and a direction of rotation of the electric motor.
    Type: Application
    Filed: July 5, 2017
    Publication date: January 10, 2019
    Inventors: Joseph R. LITTLEFIELD, Craig S. ROSS
  • Patent number: 10017045
    Abstract: A transmission for a hybrid powertrain includes a first input, a second input, a third input, and an output. A sun gear is attached to and rotatable with the first input. A carrier is attached to and rotatable with the third input. The carrier rotatably supports a plurality of pinions. Each of the pinions includes a first pinion gear and a second pinion gear. Each second pinion gear of the pinions is disposed in meshing engagement with the sun gear. A first ring gear is disposed in meshing engagement with each first pinion gear of the pinions. The first ring gear is disposed in torque communication with the second input. A second ring gear is disposed in meshing engagement with each second pinion gear of the pinions. The second ring gear is disposed in torque communication with the output.
    Type: Grant
    Filed: January 5, 2017
    Date of Patent: July 10, 2018
    Assignee: GM Global Technology Operations LLC
    Inventors: Shawn H. Swales, Craig S. Ross
  • Publication number: 20180186229
    Abstract: A transmission for a hybrid powertrain includes a first input, a second input, a third input, and an output. A sun gear is attached to and rotatable with the first input. A carrier is attached to and rotatable with the third input. The carrier rotatably supports a plurality of pinions. Each of the pinions includes a first pinion gear and a second pinion gear. Each second pinion gear of the pinions is disposed in meshing engagement with the sun gear. A first ring gear is disposed in meshing engagement with each first pinion gear of the pinions. The first ring gear is disposed in torque communication with the second input. A second ring gear is disposed in meshing engagement with each second pinion gear of the pinions. The second ring gear is disposed in torque communication with the output.
    Type: Application
    Filed: January 5, 2017
    Publication date: July 5, 2018
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Shawn H. Swales, Craig S. Ross
  • Patent number: 9856959
    Abstract: A clutch latching system is provided for latching and draining a torque transmitting mechanism. The latching clutch control system may include a latching valve, a release valve, and an accumulator. The clutch latching system may include a clutch feed channel configured to provide hydraulic fluid from a pressurized source to a torque transmitting device when the torque transmitting device is engaged and the engine is running. A latching valve connects the clutch feed channel to the torque transmitting device. The latching valve is configured to selectively trap pressurized hydraulic fluid within the torque transmitting device. A hydraulic pressure storage circuit configured to selectively provide pressurized hydraulic fluid to the latching valve to unlatch the latching valve. A multiple speed transmission is also provided.
    Type: Grant
    Filed: February 1, 2016
    Date of Patent: January 2, 2018
    Assignee: GM GLOBAL TECNOLOGY OPERATIONS LLC
    Inventors: Craig S. Ross, Paul G. Otanez
  • Patent number: 9777814
    Abstract: A three mode continuously variable transmission (CVT) for a motor vehicle includes an optional speed change device connected to a pulley and a belt assembly or other continuously variable unit. The pulley and belt assembly is also connected to a planetary gear set arrangement. The planetary gear set arrangement generally includes two planetary gear sets, two brakes and two clutches. The planetary gear set arrangement is connected to a final drive unit. Engagement of the clutches and brakes provides three modes of operation to the CVT.
    Type: Grant
    Filed: April 24, 2014
    Date of Patent: October 3, 2017
    Assignee: GM Global Technology Operations LLC
    Inventors: Edward W. Mellet, Craig S. Ross, Chunhao J. Lee
  • Patent number: 9574622
    Abstract: A system is provided for latching and draining a torque transmitting device. The system may include a clutch feed channel having an inlet portion and a clutch portion. The inlet portion is configured to provide hydraulic fluid from a pressurized source to the clutch portion. The clutch portion is configured to provide hydraulic fluid to a torque transmitting device. An inlet valve connects the inlet portion of the clutch feed channel to the clutch portion of the clutch feed channel. The inlet valve is configured to open to allow the hydraulic fluid to flow from the inlet portion to the clutch portion when the torque transmitting device is engaged. The inlet valve is configured to close and to trap hydraulic fluid within the torque transmitting device when the torque transmitting device is not actively pressurized. A multispeed transmission is also provided.
    Type: Grant
    Filed: April 5, 2013
    Date of Patent: February 21, 2017
    Assignee: GM Global Technology Operations, LLC
    Inventors: Craig S. Ross, Paul G. Otanez
  • Patent number: 9539892
    Abstract: The transmission includes an input shaft rotatable about a first axis of rotation, and a countershaft arranged substantially parallel with the input shaft and rotatable about a second axis of rotation. An output member is operatively connected to rotate in unison with the countershaft. Multiple pairs of intermeshing gears are included, each having a respective synchronizable gear that rotates about one of the input shaft and the countershaft, and a respective fixed gear mounted to the other one of the input shaft and the countershaft to rotate in unison therewith. An electric motor has a rotor concentric with and rotatable about the first axis of rotation. A first synchronizer is selectively engageable to synchronize rotation of the rotor with the input shaft. A second synchronizer is selectively engageable to synchronize rotation of the rotor with one of the synchronizable gears that rotates about the input shaft.
    Type: Grant
    Filed: May 30, 2013
    Date of Patent: January 10, 2017
    Assignee: GM Global Technology Operations LLC
    Inventors: Craig S. Ross, Scott H. Wittkopp
  • Publication number: 20160369869
    Abstract: A transmission is connectable to an input member and includes an output transfer gear, first and second transmission input shaft members, first, second, and third countershaft members, first and second sleeve shafts, a plurality of co-planar gear sets, and a plurality of torque transmitting devices. The torque transmitting devices include a plurality of gears, synchronizer assemblies and a dual clutch assembly. The transmission is operable to provide at least one reverse speed ratio and a plurality of forward speed ratios between the input member and the output member.
    Type: Application
    Filed: August 29, 2016
    Publication date: December 22, 2016
    Inventors: SCOTT H. WITTKOPP, CRAIG S. ROSS
  • Patent number: 9453558
    Abstract: A transmission is connectable to an input member and includes an output transfer gear, first and second transmission input shaft members, first and second countershaft members, first and second sleeve shafts, a plurality of co-planar gear sets, and a plurality of torque transmitting devices. The torque transmitting devices include a plurality of gears, synchronizer assemblies and a dual clutch assembly. The transmission is operable to provide at least one reverse speed ratio and a plurality of forward speed ratios between the input member and the output member.
    Type: Grant
    Filed: July 8, 2014
    Date of Patent: September 27, 2016
    Assignee: GM Global Technology Operations, LLC
    Inventors: Scott H. Wittkopp, Craig S. Ross
  • Publication number: 20160146325
    Abstract: A clutch latching system is provided for latching and draining a torque transmitting mechanism. The latching clutch control system may include a latching valve, a release valve, and an accumulator. The clutch latching system may include a clutch feed channel configured to provide hydraulic fluid from a pressurized source to a torque transmitting device when the torque transmitting device is engaged and the engine is running. A latching valve connects the clutch feed channel to the torque transmitting device. The latching valve is configured to selectively trap pressurized hydraulic fluid within the torque transmitting device. A hydraulic pressure storage circuit configured to selectively provide pressurized hydraulic fluid to the latching valve to unlatch the latching valve. A multiple speed transmission is also provided.
    Type: Application
    Filed: February 1, 2016
    Publication date: May 26, 2016
    Inventors: Craig S. Ross, Paul G. Otanez