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    Electric machine with stator tooth tip profile for reducing winding-based power losses
    2.
    发明授权
    Electric machine with stator tooth tip profile for reducing winding-based power losses 有权

    公开(公告)号：US11496015B2

    公开(公告)日：2022-11-08

    申请号：US16429828

    申请日：2019-06-03

    Applicant: GM Global Technology Operations LLC

    Inventor： Mohammad F. Momen ,  Khwaja M. Rahman

    IPC: H02K3/42 ,  H02K1/16 ,  H02K7/00 ,  H02K11/00 ,  H02K11/33 ,  B60K1/04 ,  B60L50/60 ,  H02K21/14

    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.

    ELECTRIC MACHINE INCLUDING A STATOR HAVING A TOOTH PROFILE THAT REDUCES PARASITIC VOLTAGE
    4.
    发明申请
    ELECTRIC MACHINE INCLUDING A STATOR HAVING A TOOTH PROFILE THAT REDUCES PARASITIC VOLTAGE 有权

    公开(公告)号：US20230018618A1

    公开(公告)日：2023-01-19

    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

    IPC: H02K1/16 ,  H02K1/14 ,  H02K3/12

    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.

    MIXED BAR AND WIRE CONDUCTOR COMBINATIONS FOR HIGH-SPEED ELECTRIC MOTORS
    6.
    发明申请
    MIXED BAR AND WIRE CONDUCTOR COMBINATIONS FOR HIGH-SPEED ELECTRIC MOTORS 有权

    公开(公告)号：US20250119002A1

    公开(公告)日：2025-04-10

    申请号：US18483181

    申请日：2023-10-09

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Mohammad F. Momen ,  Mazharul Chowdhury ,  Alexander Forsyth ,  Yilun Luo

    IPC: H02K1/16 ,  B60K1/00 ,  H02K3/12 ,  H02K7/00 ,  H02K11/33 ,  H02K15/02

    Abstract: Presented are electric machines with both bar and wire conductors, methods for making/using such machines, and vehicles equipped with such machines. An electric machine, such as a traction motor or electric generator, includes an outer housing, a stator fixedly mounted to the housing, and a rotor movably mounted to the housing and spaced across an airgap from the stator. Multiple magnets, such as permanent magnet blocks, are mounted on or in slots of the rotor (or the stator). A set of electromagnetic conductors extends through each radially elongated slot of the stator (or the rotor). Each conductor set includes a group of solid-wire or multistrand-wire conductors that is located adjacent the airgap. A group of hairpin or I-pin bar conductors is radially spaced from the airgap and located adjacent the wire conductors. The bar conductors have a cross-sectional area/shape that is distinct from a cross-sectional area/shape of the wire conductors.

    SEGMENTED INTERIOR PERMANENT MAGNET ELECTRIC MACHINE
    7.
    发明申请
    SEGMENTED INTERIOR PERMANENT MAGNET ELECTRIC MACHINE 有权

    公开(公告)号：US20250038595A1

    公开(公告)日：2025-01-30

    申请号：US18361289

    申请日：2023-07-28

    Applicant: GM Global Technology Operations LLC

    Inventor： Mazharul Chowdhury ,  Le Chang ,  William Robert Jensen ,  Mohammad F. Momen ,  Alan Del Rio

    IPC: H02K1/276 ,  H02K7/00

    Abstract: An interior permanent magnet electric machine includes a stator and a rotor. The rotor features a rotor core with slots extending between its opposite ends. These slots contain a segmented magnet assembly, which includes magnet segments of different magnetic materials. The segmented magnet assembly may be divided radially, axially, circumferentially or combinations thereof and may include outer magnet segments made of the first magnetic material and inner magnet segments made of the second magnetic material. Additionally, the segmented magnet assembly includes magnetic poles that are aligned in radial, axial, or circumferential directions.

    STATOR TOOTH AND WINDING CONDUCTOR DESIGNS FOR ELECTRIC MACHINES
    9.
    发明公开
    STATOR TOOTH AND WINDING CONDUCTOR DESIGNS FOR ELECTRIC MACHINES 审中-公开

    公开(公告)号：US20230208216A1

    公开(公告)日：2023-06-29

    申请号：US17560404

    申请日：2021-12-23

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Mohammad F. Momen ,  Edward L. Kaiser

    IPC: H02K1/16 ,  H02K1/276 ,  H02K7/00 ,  H02K21/14 ,  B60K1/00

    CPC classification number: H02K1/165 ,  H02K1/276 ,  H02K7/006 ,  H02K21/14 ,  B60K1/00 ,  H02K2201/03

    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.

    SYNCHRONOUS MACHINE HAVING HYBRID ROTOR EXCITATION
    10.
    发明申请
    SYNCHRONOUS MACHINE HAVING HYBRID ROTOR EXCITATION 有权

    公开(公告)号：US20220103049A1

    公开(公告)日：2022-03-31

    申请号：US17038757

    申请日：2020-09-30

    Applicant: GM Global Technology Operations LLC

    Inventor： Alireza Fatemi ,  Shawn H. Swales ,  Mohammad F. Momen ,  Derek F. Lahr

    IPC: H02K21/04 ,  H02K1/27

    Abstract: A synchronous machine having a hybrid rotor excitation. The synchronous machine includes a rotor having a plurality of permanent magnets and electromagnets embedded within a rotor body. The permanent magnets produces a constant magnet field having a magnetic axis along a direct axis (D-axis). The electromagnets produces a variable magnetic field along a magnetic axis offset from the D-axis, preferable substantially orthogonal to the D-axis. The plurality of permanent magnets are separated from the electromagnets by a rotor air-gap. The plurality of permanent magnets includes inner pairs and outer pairs of permanent magnets nested in a V-shaped configuration. In another embodiment, the outer pairs of permanent magnets are replaced with outer radius electromagnets.

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