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公开(公告)号：US20250158553A1
公开(公告)日：2025-05-15
申请号：US18506454
申请日：2023-11-10
Applicant: GM Global Technology Operations LLC
Inventor： Rashmi Prasad , Chandra S. Namuduri , Junghoon Kim , Yilun Luo , Khorshed Mohammed Alam
IPC: H02P27/08 , B60L15/00 , B60L50/40 , B60R16/033
Abstract: A vehicle system includes a first battery pack connected to a second battery pack via a flying capacitor multi-level inverter. The fling capacitor inverter has multiple inverter legs, with each inverter leg being arranged in a flying capacitor topology. A three phase motor is connected to the inverter. A controller connected to the motor and the inverter. The controller includes a memory storing instructions configured to cause the controller to control the inverter as a direct current (DC)-DC converter such that a circulating current passes through the motor, the first battery pack and the second battery pack.
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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：US12249944B2
公开(公告)日：2025-03-11
申请号：US17989824
申请日：2022-11-18
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Muhammad H. Alvi , Khorshed Mohammed Alam , Jiyu Zhang , Chunhao J. Lee , Brian A. Welchko
IPC: H02P29/028 , H02P27/08
Abstract: Apparatus and techniques for analyzing a capacitance value in an electric motor inverter are disclosed. A processor is coupled to a DC-AC inverter, which includes a capacitor across its terminals and is powered by a battery. The processor performs resistor switching to enable singular, periodic measurement of the capacitance. The measured value is compared with a nominal or beginning of life (BOL) value. An alert may be sent if the capacitance has degraded beyond a threshold. In other aspects, the DC torque ripple envelop is used to measure capacitance. The outcome is compared with the other tests to assess consistency. An inconsistent outcome may identify potential resistor degradation.
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公开(公告)号：US20240429713A1
公开(公告)日：2024-12-26
申请号：US18339606
申请日：2023-06-22
Applicant: GM Global Technology Operations LLC
Inventor： Chandra S. Namuduri , Rashmi Prasad , Suresh Gopalakrishnan , Yilun Luo , Khorshed Mohammed Alam , Minh-Khai Nguyen
Abstract: An electric vehicle includes a drive system that performs a method of transferring power between a vehicle and an external location. The drive system includes a battery, a rectifier, and a processor. The rectifier is one of a two-level rectifier and a multi-level rectifier. The processor is configured to connect the rectifier between an alternating current (AC) port of an outlet of an external location and the battery. The rectifier is configured to convert between an AC power at the AC port on an external side of the rectifier and a direct current (DC) power at a vehicle side of the rectifier in order to transfer power bi-directionally between the external location and the battery.
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5.发明申请公开(公告)号：US20250141320A1
公开(公告)日：2025-05-01
申请号：US18494085
申请日：2023-10-25
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Muhammad A. Zahid , Alexander Forsyth , Khorshed Mohammed Alam , Mazharul Chowdhury , Yilun Luo
Abstract: Presented are electric machines with rotor shaft-mounted heat pipes/vapor chambers thermally coupled to endcap-integrated heat sinks, methods for making/using such machines, and vehicles equipped with such machines. An electric machine includes an outer housing, a stator assembly mounted to the housing, and a rotor assembly rotatably mounted adjacent the stator assembly. The stator assembly includes one or more stator windings mounted to an annular stator core. The rotor assembly includes one or more electromagnetic rotor windings mounted to a cylindrical rotor core. A rotor power transfer circuit (PTC) is electrically connected to the rotor assembly to electrify the rotor winding(s). A rotor shaft is attached to the rotor core to rotate in unison therewith. One or more heat pipes are mounted on the rotor shaft's outer surface and project axially between the rotor PTC and rotor core. Each heat pipe passively extracts and transfers thermal energy from the rotor PTC.
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Patent Agency Ranking
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：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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8.发明公开公开(公告)号：US20240171111A1
公开(公告)日：2024-05-23
申请号：US17989824
申请日：2022-11-18
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Muhammad H. Alvi , Khorshed Mohammed Alam , Jiyu Zhang , Chunhao J. Lee , Brian A. Welchko
IPC: H02P29/028 , H02P27/08
CPC classification number: H02P29/028 , H02P27/08
Abstract: Apparatus and techniques for analyzing a capacitance value in an electric motor inverter are disclosed. A processor is coupled to a DC-AC inverter, which includes a capacitor across its terminals and is powered by a battery. The processor performs resistor switching to enable singular, periodic measurement of the capacitance. The measured value is compared with a nominal or beginning of life (BOL) value. An alert may be sent if the capacitance has degraded beyond a threshold. In other aspects, the DC torque ripple envelop is used to measure capacitance. The outcome is compared with the other tests to assess consistency. An inconsistent outcome may identify potential resistor degradation.
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公开(公告)号：US20240113711A1
公开(公告)日：2024-04-04
申请号：US17957116
申请日：2022-09-30
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Muhammad Hussain Alvi , Khorshed Mohammed Alam , Yilun Luo , Chandra S. Namuduri , Suresh Gopalakrishnan , Junghoon Kim , Mohamed Kamel
IPC: H03K17/687 , H03K17/04 , H03K17/16
CPC classification number: H03K17/6877 , H03K17/0406 , H03K17/168
Abstract: A system includes an electronic device including a circuit having a semiconductor switch, and a switching control system operably connected to the semiconductor switch. The switching control system is configured to control a switching speed of the semiconductor switch based on a received voltage by altering at least one of a gate resistance and a gate capacitance of the semiconductor switch.
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公开(公告)号：US20240022161A1
公开(公告)日：2024-01-18
申请号：US17865482
申请日：2022-07-15
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Hong Nguyen , Michael Z. Pieszala , Yilun Luo , Khorshed Mohammed Alam , Sanjeev M. Naik , Benjamin S. Ngu
IPC: H02M1/08 , H02M7/5395 , H03K17/16
CPC classification number: H02M1/08 , H02M7/5395 , H03K17/16
Abstract: A variable current gate driver for a transistor includes a first current control device having a first controllable output current. The first current control device is electrically connected between a first bus and an activator of the transistor, and a second current control device having a second controllable output current. The second current control device is electrically connected between the activator of the transistor and a second bus. A controller is operatively connected to the first and second current control devices to control the first and second controllable output currents to control the first and second current control devices to control activation of the transistor via the activator. The controller is operative to control the first and second current control devices to control a slew rate of the transistor.
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