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公开(公告)号：US10804757B1
公开(公告)日：2020-10-13
申请号：US16371702
申请日：2019-04-01
Applicant: GM Global Technology Operations LLC
Inventor： Alireza Fatemi , Derek F. Lahr
Abstract: A cycloidal reluctance machine includes a stator surrounding a rotor. Stator windings and rotor windings form respective concentric rotor and stator electromagnets. The rotor is eccentrically positioned with respect to the stator to move with two degrees of freedom (2DOF), including rotating motion about a rotary axis of the rotor and orbiting motion about a center axis of the stator. A rotor constraint mechanism (RCM) constrains motion of the rotor, such that the rotor is able to generate and transmit output torque to a coupled load in at least one of the 2DOF. A magnetic field polarity of stator poles and/or rotor poles of the respective stator and rotor changes over one electrical cycle of the polyphase voltage. The coupled load may be a drive axle of a vehicle in some embodiments. In others, the stator and rotor windings are driven via different power inverters.
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公开(公告)号：US10763772B1
公开(公告)日：2020-09-01
申请号：US16394400
申请日：2019-04-25
Applicant: GM Global Technology Operations LLC
Inventor： Alireza Fatemi , Derek F. Lahr
IPC: H02P25/086 , H02K11/21 , H02K11/27 , H02K41/06 , H02K11/33
Abstract: An electrical system includes an inverter connected to AC and DC voltage buses, a cycloidal electric machine connected to the PIM via the AC voltage bus, and a controller. The machine's rotor is eccentric with respect to the stator, an airgap between the stator and rotor is smaller at an instantaneous center of rotation of the rotor than elsewhere around a circumference of the rotor, and the rotor moves with two degrees of freedom (2DOF), i.e., rotating and orbiting motion. The controller receives a torque command, the rotor position signal, and the current signals, and in response identifies an optimal stator pole or pole pair located proximate the instantaneous center of rotation and energizes the optimal stator pole or pole pair via the PIM prior to energizing another stator pole or pole pair of the stator.
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公开(公告)号：US10666099B1
公开(公告)日：2020-05-26
申请号：US16199868
申请日：2018-11-26
Applicant: GM Global Technology Operations LLC
Inventor： Alireza Fatemi , Thomas W. Nehl , David J. Brooks
Abstract: Presented are slotted permanent magnets (PM) for electric machines, motor generator units using slotted PMs, methods for making/using slotted PMs, and motor vehicles equipped with an electric traction motor using slotted PMs. An electric machine includes an annular stator with a hollow core and one or more internal stator slots. One or more electrically conductive windings is/are disposed in the stator slot(s). A cylindrical rotor is rotatably disposed inside the hollow core of the stator. One or more permanent magnets is/are mounted to the rotor. Each permanent magnet includes a rigid, single-piece PM body with opposing first and second faces. A first set of elongated grooves is recessed into the first face. An optional second set of elongated grooves is recessed into the second face. Each of the grooves has a depth that is substantially parallel to a direction of a magnetic field generated by the permanent magnet.
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公开(公告)号：US20190190347A1
公开(公告)日：2019-06-20
申请号：US15845353
申请日：2017-12-18
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Nilesh D. Mankame , Alireza Fatemi , Avoki M. Omekanda , Thomas W. Nehl , Lei Hao
Abstract: An electric motor includes a rotor having a stack of laminations positioned axially relative to one another. The stack of laminations includes a first rotor lamination that is divided into a first portion and a second portion. The first rotor lamination is configured to have an asymmetric mass distribution such that the first portion has a first mass and the second portion has a second mass, with the first mass being different from the second mass. The electric motor is configured to selectively generate an unbalanced force during operation (i.e., when the rotor is spinning). The electric motor may include a stator configured to have an asymmetric magnetic field distribution. The electric motor may be employed in a haptic assembly and eliminates the need for a separate eccentric mass to generate a haptic signal.
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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
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.
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Patent Agency Ranking
公开(公告)号：US20240097536A1
公开(公告)日：2024-03-21
申请号：US17933146
申请日：2022-09-19
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Sen Jiang Zhou , Jack M Gayney , Alireza Fatemi
CPC classification number: H02K11/40 , H02K5/1732
Abstract: A rotor grounding system for an electric machine includes a rotor including a shaft assembly configured to rotate about an axis. A housing supports the shaft assembly for rotation of the rotor. A bearing assembly has an outer circumference disposed against the shaft assembly. A discharge bar extends through at least a part of the bearing assembly. The bearing assembly has an inner circumference disposed against the discharge bar. A discharge circuit is defined between the rotor and the housing, where the discharge circuit extends through the bearing assembly and the discharge bar.
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公开(公告)号：US20240055959A1
公开(公告)日：2024-02-15
申请号：US17819701
申请日：2022-08-15
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Sen Jiang Zhou , Alireza Fatemi , Jack M Gayney
Abstract: An electric machine grounding system with low impedance includes a rotor that has a shaft assembly and that is configured to rotate about an axis. The shaft assembly has a surface. A housing supports the shaft assembly for rotation of the rotor. A holder extends from the housing. A ground assembly is held between the holder and the shaft assembly and includes a plurality of strands that extend to the surface to ground the shaft assembly to the housing.
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公开(公告)号：US11901844B1
公开(公告)日：2024-02-13
申请号：US17895366
申请日：2022-08-25
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Chandra S. Namuduri , Suresh Gopalakrishnan , Norman K. Bucknor , Alireza Fatemi , Thomas W. Nehl
CPC classification number: H02P23/02 , B60L15/2045 , H02P23/14 , B60L2240/12 , B60L2240/423
Abstract: A method of controlling an electric motor of a vehicle includes monitoring torque command signals from a vehicle system to the electric motor, each torque command signal configured to cause the electric motor to output a commanded torque, and monitoring a speed of the vehicle and an output torque of the electric motor, the output torque responsive to a drive signal generated based on the torque command signals. The method also includes, based on the output torque and the vehicle speed indicating a low motor efficiency condition, modulating the drive signal between a first torque value and a second torque value that is less than the first torque value, the first torque value greater than the commanded torque and selected to increase an efficiency of the electric motor.
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公开(公告)号：US20240019013A1
公开(公告)日：2024-01-18
申请号：US17863518
申请日：2022-07-13
Applicant: GM Global Technology Operations LLC
Inventor： Alireza Fatemi , Chandra S. Namuduri
CPC classification number: F16F15/03 , B60G17/06 , B60G2500/10
Abstract: A vehicle, suspension system of the vehicle and method of operating the suspension system is disclosed. The suspension system includes a rotary motor, a rectifier circuit and a logic circuit. The rotary motor is configured to generate a current based on a direction of rotation of the rotary motor. The rectifier circuit is configured to applying a damping force against the rotation at the rotary motor based on an impedance. The logic circuit changes the impedance of the rectifier circuit based on the direction of rotation of the rotary motor.
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公开(公告)号：US20240017582A1
公开(公告)日：2024-01-18
申请号：US17863514
申请日：2022-07-13
Applicant: GM Global Technology Operations LLC
Inventor： Alireza Fatemi , Thomas W. Nehl , Chandra S. Namuduri , Brian K. Saylor , Nilesh D. Mankame , Anthony Michael Coppola
CPC classification number: B60G17/06 , B60G13/16 , B60G2202/25 , B60G2204/62 , B60G2206/41 , B60G2600/22 , B60G2800/162
Abstract: A vehicle, suspension system and method of dampening a force on the suspension system is disclosed. The suspension system includes a damper having a first damping element and a second damping element configured to rotate relative to each other in response to a force received at the suspension system. The second damping element induces an eddy current in the first damping element during relative rotation. A feature of one at least one of the first damping element and the second damping element provides a first electrical resistance to the eddy current during relative rotation in a first direction and a second electrical resistance to the eddy current during relative rotation in a second direction. The first electrical resistance generates a first damping force and the second electrical resistance generates a second damping force.
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