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

IPC: H02P29/66 ,  B60L15/20

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.

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.

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

IPC: H02K21/16 ,  H02K1/16 ,  H02K1/276 ,  H02K3/12

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.

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.

公开(公告)号：US12152657B2

公开(公告)日：2024-11-26

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: F16H3/44

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.

公开(公告)号：US20240380342A1

公开(公告)日：2024-11-14

申请号：US18313616

申请日：2023-05-08

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： William Robert Jensen ,  Mazharul Chowdhury ,  Suresh Gopalakrishnan ,  Lei Hao ,  Peng Peng

IPC: H02P6/10

Abstract: Techniques are provided for torque ripple mitigation. In one embodiment, the techniques involve determining a first torque ripple at a torque output of a target electrical machine, upon determining that the first torque ripple exceeds a threshold, reproducing the torque output based on a pair of gamma control sets, determining a second torque ripple at the reproduced torque output, upon determining that the second torque ripple falls below the threshold, generating qualified gamma controls based on the gamma control sets, and supplying the qualified gamma controls to the target electrical machine.

公开(公告)号：US20240421681A1

公开(公告)日：2024-12-19

申请号：US18336202

申请日：2023-06-16

Applicant: GM Global Technology Operations LLC

Inventor： Alireza Fatemi ,  Alan G. Holmes ,  Shawn H. Swales ,  Mazharul Chowdhury ,  Muhammad Hussain Alvi ,  Peng Peng ,  Thomas W. Nehl

IPC: H02K21/04 ,  B60L53/22

Abstract: A vehicle's electrified powertrain includes a battery pack linked to a traction power inverter module (TPIM) converting DC voltage from the battery pack into AC voltage. A rotary electric machine includes a stator energized by the TPIM's AC voltage, enclosing a rotor core capable of rotation. The rotor core contains slots holding conductive bars and permanent magnets, with conductive bars positioned closer to the rotor core's center. The conductive bars and permanent magnets are separated by gaps within each slot. An annular end ring assembly is present at one end of the rotor core, featuring terminal conductors connected to subsets of conductive bars and a secondary coil of a rotary transformer. When the stator is energized, the rotor shaft, connected to the rotor, rotates. The electric machine powers a transmission, which is coupled to the rotor shaft.