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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：US20240429773A1
公开(公告)日：2024-12-26
申请号：US18339822
申请日：2023-06-22
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Yilun Luo , John Diemer , Jack M. Gayney , Patrick S. Portell , Sanjeev M. Naik , Azadeh Narimissa , Mohammad F. Momen
Abstract: An electric motor including a motor casing, a shaft having an axis of rotation, a first end and a second end, a first main bearing for rotatably supporting the shaft at the first end within the motor casing, a second main bearing for rotatably supporting the shaft at the second end within the motor casing, and a grounding bearing for conducting a bearing current between the shaft and the motor casing.
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Patent Agency Ranking
公开(公告)号：US20240413777A1
公开(公告)日：2024-12-12
申请号：US18330444
申请日：2023-06-07
Applicant: GM Global Technology Operations LLC
Inventor： Junghoon Kim , Muhammad Hussain Alvi , Mohammad F. Momen , Yilun Luo
Abstract: An electric motor configuration includes a dual output multilevel inverter. The inverter includes a first and second set of alternating current (AC) phase outputs. The first set of AC phase outputs provide a current, each phase output of the first set of AC phase outputs corresponds to a phase output of the second set of AC phase outputs, and each phase output of the first set of AC phase outputs is offset from the corresponding phase output of the second set of phase outputs by 180 degrees. An electric motor includes a first and second set of antiparallel motor windings. The first set of motor windings is connected to the first set of AC phase outputs and the second set of motor windings are connected to the second set of AC phase outputs. The electric motor includes a mechanical rotation output.
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公开(公告)号：US11942822B2
公开(公告)日：2024-03-26
申请号：US17560404
申请日：2021-12-23
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Mohammad F. Momen , Edward L. Kaiser
Abstract: Presented are electric machines with optimized stator tooth geometries and multi-gauge stator conductors, methods for making/using such electric machines, and motor vehicles equipped with such electric machines. An electric machine includes a housing, a rotor assembly rotatably attached to the housing, and a stator assembly coaxial with and separated by an airgap from the rotor assembly. The rotor assembly includes one or more magnets mounted to a rotor core. The stator assembly includes a stator core with multiple axially elongated, circumferentially spaced stator slots, multiple radially aligned stator teeth interleaved between and separating the slots, and multiple electromagnetic windings wound through the slots. Each stator tooth has an elongated tooth body with a tooth head at a radial end of a tooth root, which attaches to a cylindrical hub of the stator core. The tooth head has an axial cross-section with a trapezoidal crown integral with a rectangular tip.
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16.发明授权公开(公告)号：US11916436B2
公开(公告)日：2024-02-27
申请号：US17375101
申请日：2021-07-14
Applicant: GM Global Technology Operations LLC
Inventor： Alireza Fatemi , Mohammad F. Momen , Thomas W. Nehl
CPC classification number: H02K1/165 , H02K1/146 , H02K3/12 , H02K2201/06
Abstract: An electric machine includes a housing, a rotor rotatably mounted to the housing, and a stator mounted to the housing about the rotor. The stator includes a stator body formed from a plurality of laminations. The plurality of laminations include an outer annular surface defining a radius, an inner annular surface spaced from the rotor, and a plurality of radially inwardly extending stator teeth spaced one from another by plurality of gaps. Each of the plurality of gaps extend along the radius and include an opening exposed at the inner annular surface. The opening has a first side portion and a second side portion each extending at an angle relative to the radius.
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17.发明申请公开(公告)号：US20200381972A1
公开(公告)日：2020-12-03
申请号：US16429828
申请日：2019-06-03
Applicant: GM Global Technology Operations LLC
Inventor： Mohammad F. Momen , Khwaja M. Rahman
Abstract: A rotary electric machine includes a rotor and a stator. The stator has windings and teeth extending radially from a stator core. Each tooth is separated from an adjacent tooth by a stator slot that opens to a radial stator-rotor airgap via a slot opening. The windings are positioned within each slot. Each stator tooth has a tooth tip with a surface profile configured to guide rotor flux away from areas of the windings proximate the respective slot opening. The tip surface profile may be a concave region, e.g., a dent/chamfer, and/or a convex region, e.g., a bump/bulge, and is formed in a distal end surface of the tip proximate the opening. The stator-rotor airgap is smaller at the convex region and larger at the concave region than elsewhere along the distal end surface. An electrical system includes the machine, a battery, and a power inverter module.
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公开(公告)号：US20200044497A1
公开(公告)日：2020-02-06
申请号：US16055412
申请日：2018-08-06
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Mohammad F. Momen , Khwaja M. Rahman
Abstract: A rotating electric machine includes a stator and a rotor disposed within the stator. The stator defines a plurality of teeth and a plurality of semi-open slots. The plurality of semi-open slots further include a plurality of slot groups wherein each slot group further includes a plurality of slot subgroups. Each slot group includes at least a first subgroup of slots having a first slot opening width and being dedicated to a first phase, and a second subgroup of slots having a second slot opening width and being dedicated to a second phase, the second slot opening width being different from the first slot opening width.
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