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公开(公告)号：US20250119021A1
公开(公告)日：2025-04-10
申请号：US18483166
申请日：2023-10-09
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Dumitru Puiu , Mazharul Chowdhury , Mohammad F. Momen , Khorshed Mohammed Alam , Muhammad A. Zahid , Yilun Luo
Abstract: A rotor assembly includes a rotor shaft and a rotor core supported by the rotor shaft and surrounded by a plurality of windings. The rotor assembly also includes a first brush engaging a first slip ring fixed relative to a first distal end of the rotor shaft. The first brush includes one of a first conical projection or a first convex receptacle and the first slip ring includes the other of the first conical projection or the first convex receptacle. A first electrical connection extends between the first slip ring and the plurality of windings. A second brush is configured to engage a second slip ring with the second slip ring fixed relative to the rotor shaft. A second electrical connection extending between the second slip ring and the plurality of windings.
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公开(公告)号：US20250055403A1
公开(公告)日：2025-02-13
申请号：US18448464
申请日：2023-08-11
Applicant: GM Global Technology Operations LLC
Inventor： Mohammad F. Momen , Mazharul Chowdhury , Michael C. Muir , Jared Lee
Abstract: Rotor flux control in a permanent magnet (PM) electric machine involves controlling fluid flow through the rotor based on the torque versus speed operating point of the PM machine. When the torque at a given speed falls below a predetermined threshold, the rotor receives a reduced fluid flow compared to when the torque is above the threshold. Fluid flow through the stator is controlled in an inverse manner relative to the rotor's fluid flow such that when the rotor experiences reduced fluid flow, the stator receives an increased fluid flow. This approach enables efficient control of the rotor's magnetic flux, enhancing the performance and efficiency of the PM electric machine during various operating conditions.
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公开(公告)号：US20250119037A1
公开(公告)日：2025-04-10
申请号：US18480592
申请日：2023-10-04
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Muhammad A. Zahid , Khorshed Mohammed Alam , Mazharul Chowdhury , Dumitru Puiu
Abstract: A power transfer system for a separately excited machine includes a positive slipring and a negative slipring. One or more positive brushes and one or more negative brushes. A rotor winding attached to rotor laminations and a stator winding attached to stator laminations, such that the stator winding is outside of the rotor winding. The power transfer system may have a hollow shaft. The power transfer system may also have the negative brush and the negative slipring being exterior to the hollow shaft, and one or more position sensors. A shaft ingress separator may be within the hollow shaft and may act as a barrier between wet areas and dry areas. The power transfer system may also include a positive wire and a negative wire, which may be reversed.
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4.发明申请公开(公告)号：US20250119030A1
公开(公告)日：2025-04-10
申请号：US18482212
申请日：2023-10-06
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Mazharul Chowdhury , Muhammad A. Zahid , Khorshed Mohammed Alam , Suresh Gopalakrishnan , Ajay Mehta , Chandra S. Namuduri
IPC: H02K11/225 , G01D5/20 , H02J50/05 , H02J50/10 , H02K11/042
Abstract: An electric machine includes a rotor assembly having a rotor shaft disposed along a central axis. The electric machine includes an inductive position sensor having a sensor target that is operatively connected to the rotor shaft. The sensor target is fixed relative to the rotor shaft such that the sensor target rotates with the rotor shaft. The electric machine includes a stationary member and a rotating member operatively connected to the rotor shaft. The rotating member is spaced from the stationary member by an air gap. The stationary member and the rotating member are configured to enable non-contact power transfer from the stationary member to the rotating member through the air gap. The non-contact power transfer may be an inductive power transfer or a capacitive power.
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公开(公告)号：US20240337306A1
公开(公告)日：2024-10-10
申请号：US18295318
申请日：2023-04-04
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Edward W. Mellet , Peter Beller , Mazharul Chowdhury
IPC: F16H57/023 , F16H3/44
CPC classification number: F16H3/44 , F16H2200/2005 , F16H2200/203
Abstract: Compact transmission systems and vehicles with such transmission systems are provided. An exemplary compact transmission includes a drive shaft defining a drive axis and configured to be powered by a drive unit; a planetary gearset having a ring gear member, a planet gear member, a sun gear member, and a planet carrier having a carrier shaft defining a planetary axis, wherein the planetary axis is distanced from the drive axis; an output shaft defining an output axis, wherein the output axis is distanced from the planetary axis and from the drive axis; an output gear connected to the output shaft; a drive pinion gear configured to transfer torque from the drive shaft to the planetary gearset; and an output pinion gear configured to transfer torque from the planetary gearset to the output shaft.
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Patent Agency Ranking
6.发明公开公开(公告)号：US20240162796A1
公开(公告)日：2024-05-16
申请号：US17988102
申请日：2022-11-16
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： William R. Jensen , Mazharul Chowdhury , Jay Jihyun Kim
CPC classification number: H02K21/16 , H02K1/16 , H02K1/276 , H02K3/12 , H02K2201/03
Abstract: Aspects of a synchronous electric motor, including a synchronous interior permanent magnet or a synchronous reluctance motor, are disclosed. The outer edges of pockets and magnet pockets, including flux barriers, selectively include one or more notches at the front of the pockets. The use of these notches may redirect flow of the magnetic flux such that overall torque ripple may be reduced without significantly adversely affecting the average torque output of the motor. In some embodiments, various characteristics of the notches may be changed to achieve optimal performance including number, geometry, and location of the notches on select outer edges of the pockets. Another characteristic includes symmetry of the notches or asymmetry, whether in the radial and longitudinal directions of the rotor.
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公开(公告)号：US20250119034A1
公开(公告)日：2025-04-10
申请号：US18482224
申请日：2023-10-06
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Mazharul Chowdhury , Muhammad A. Zahid , Alexander Forsyth , Khorshed Mohammed Alam , Yilun Luo , Junghoon Kim
Abstract: A rotor power transfer circuit for an electric machine. The rotor power transfer circuit may include a multiple leaf direct current (DC)-to-DC (DC-DC) converter having a plurality of branches connected in parallel to a source of DC power. The branches may include a plurality of switches operable for selectively controlling DC power transfer therethrough according to a plurality of rotor winding excitations modes. The rotor power transfer circuit may include an electrical interface configured for electrically connecting each branch with one of a one or more rotor windings wrapped around a plurality of circumferentially spaced rotor protrusions of the electric machine.
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公开(公告)号：US20250119009A1
公开(公告)日：2025-04-10
申请号：US18483237
申请日：2023-10-09
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Mazharul Chowdhury , Cheongun Han , Michael C. Muir , Mohammad F. Momen , Edward L. Kaiser
Abstract: A rotor for an electric machine including a rotor core having a plurality of circumferentially spaced rotor poles. Each rotor pole may include a plurality of rotor slots arranged into one or more magnetic layers and one or more non-magnetic layers. The magnetic layers may include a magnet within one or more of the rotor slots thereof and the non-magnetic layers including no magnets within the rotor slots thereof.
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公开(公告)号：US20250119005A1
公开(公告)日：2025-04-10
申请号：US18483577
申请日：2023-10-10
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Mazharul Chowdhury , Muhammad A. Zahid , Alexander Forsyth , Khorshed Mohammed Alam , Yilun Luo , Junghoon Kim
Abstract: An electric machine including a stator having a plurality of stator windings configured for generating a magnetic field and a rotor configured for rotating within the stator according to a torque induced by the magnetic field. The rotor includes a plurality of electrically independent rotor winding sets wrapped around each of a plurality of circumferentially spaced rotor protrusions. The electric machine further includes a power transfer circuit operable for independently controlling electrical excitation of the rotor winding sets. The electric machine further includes a cooling system for dissipating heat way from the rotor winding sets.
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公开(公告)号：US20250119033A1
公开(公告)日：2025-04-10
申请号：US18481708
申请日：2023-10-05
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Mazharul Chowdhury , Mohammad F. Momen , Khorshed Mohammed Alam , Alexander Forsyth , Yilun Luo
Abstract: A propulsion system for a vehicle includes an electric motor configured to generate torque to propel the vehicle. The electric motor has a stator assembly with a plurality of stator slots defining slot layers along a respective slot axis. A first plurality of conductors is at least partially positioned in the plurality of stator slots and forming a first winding set. A second plurality of conductors is at least partially positioned in the plurality of stator slots and forms a second winding set. A first inverter is adapted to drive the electric motor, the first winding set being coupled to the first inverter. A second inverter is adapted to drive the electric motor, the second winding set being coupled to the second inverter. The system includes a controller adapted to control operation of the first and second inverters based in part on a motor speed of the electric motor.
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