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公开(公告)号：US12120849B2
公开(公告)日：2024-10-15
申请号：US17784868
申请日：2020-12-11
Applicant: MAGNA INTERNATIONAL INC. , Ram Balachandar , Abishek Sridhar , Lakshmi Varaha Iyer , Gerd Schlager
Inventor： Ram Balachandar , Abishek Sridhar , Lakshmi Varaha Iyer , Gerd Schlager
CPC classification number: H05K7/20345 , F28F13/003 , H05K7/2039
Abstract: An impingement cooling system includes a porous heat spreader and a nozzle configured to direct a fluid as a jet and/or as a spray impinging upon the porous heat spreader. The porous heat spreader is made of a thermally-conductive material such as a metal, metal alloy, carbon/graphite, or ceramic, and is in thermal contact with a heat source. The nozzle may be configured to direct the fluid as a jet comprising a single component liquid or gas (including air) or a liquid mixture such as water-glycol or other coolants. The nozzle may be configured to direct the fluid as a spray comprising a single component liquid or gas (including air) or a liquid mixture such as water-glycol or other coolants. The cooling system may include one or more nozzles, which may direct the cooling fluid orthogonally or at an oblique angle to an impingement plate.
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公开(公告)号：US12068703B2
公开(公告)日：2024-08-20
申请号：US17613713
申请日：2020-05-29
Applicant: MAGNA INTERNATIONAL INC. , UNIVERSITY OF WINDSOR , Aiswarya Balamurali , Philip Korta , Shruthi Mukundan , Anik Animesh , Narayan Chandra Kar , Lakshmi Varaha Iyer , Gerd Schlager
Inventor： Aiswarya Balamurali , Philip Korta , Shruthi Mukundan , Anik Animesh , Narayan Chandra Kar , Lakshmi Varaha Iyer , Gerd Schlager
CPC classification number: H02P21/141 , B60L15/025 , H02P6/08 , H02P21/0003 , H02P21/06 , H02P27/085
Abstract: A motor drive system and method for determining an optimized efficiency of the motor drive system are provided. The motor drive system includes a system controller, a motor drive having includes an inverter configured to generate the AC power upon one or more motor leads, and an electric motor, which is to convert the AC power from the motor leads to rotational energy. A dynamometer may include a load coupled to the shaft and sensors to measure to measure operating characteristics such as torque and speed of the electric motor. The system controller is configured to generate a lookup table, with an entry describing an output current command for operating the inverter and the motor at a maximum system efficiency for a given combination rotational speed and output torque. Motor temperature may also be measured and used as an additional index into the lookup table.
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公开(公告)号：US20240250576A1
公开(公告)日：2024-07-25
申请号：US18290369
申请日：2022-05-12
Applicant: Majed ETEMADI , Corey Jerome KLINKHAMER , Ram BALACHANDAR , Ronald BARRON , Lakshmi Varaha IYER , MAGNA INTERNATIONAL INC.
Inventor： Majed ETEMADI , Corey Jerome KLINKHAMER , Ram BALACHANDAR , Ronald BARRON , Lakshmi Varaha IYER
IPC: H02K5/20
CPC classification number: H02K5/203
Abstract: An electric machine includes a stator, a rotor configured to rotate about an axis, and a housing surrounding the rotor and the stator. The housing includes an end cap at an axial end of the electric machine. The housing encloses an end space between the rotor and the end cap. The electric machine also includes a nozzle disposed within the end space and configured to discharge a cooling fluid into the end space in a direction tangential to the rotation of the rotor. The cooling fluid may include liquid, such as oil. The electric machine may be an induction machine or a synchronous machine. The nozzle may include an inlet tube that extends through the end cap. The electric machine may include two end spaces on opposite ends of the rotor, with one or more nozzles located in each of the two end spaces.
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公开(公告)号：US20220231624A1
公开(公告)日：2022-07-21
申请号：US17613713
申请日：2020-05-29
Applicant: Aiswarya BALAMURALl , Philip KORTA , Shruthi MUKUNDAN , Anik ANIMESH , Narayan Chandra KAR , Lakshmi Varaha IYER , Gerd SCHLAGER , MAGNA INTERNATIONAL INC. , UNIVERSITY OF WINDSOR
Inventor： Aiswarya BALAMURALI , Phlip KORTA , Shruthi MUKUNDAN , Anik ANIMESH , Narayan Chandra KAR , Lakshmi Varaha IYES , Gerd SCHLAGER
Abstract: A motor drive system and method for determining an optimized efficiency of the motor drive system are provided. The motor drive system includes a system controller, a motor drive having includes an inverter configured to generate the AC power upon one or more motor leads, and an electric motor, which is to convert the AC power from the motor leads to rotational energy. A dynamometer may include a load coupled to the shaft and sensors to measure to measure operating characteristics such as torque and speed of the electric motor. The system controller is configured to generate a lookup table, with an entry describing an output current command for operating the inverter and the motor at a maximum system efficiency for a given combination rotational speed and output torque. Motor temperature may also be measured and used as an additional index into the lookup table.
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公开(公告)号：US20250052709A1
公开(公告)日：2025-02-13
申请号：US18722616
申请日：2022-12-22
Applicant: Animesh KUNDU , Philip KORTA , Lakshmi Varaha IYER , Narayan C. KAR , MAGNA INTERNATIONAL INC.
Inventor： Animesh KUNDU , Philip KORTA , Lakshmi Varaha IYER , Narayan C. KAR
IPC: G01N25/72
Abstract: A method for state-of-health monitoring of a powertrain component in an electric vehicle system includes: determining an equivalent circuit model of the powertrain component; modeling heat losses in the powertrain component considering both transient and steady-state conditions; modeling heat flow through the powertrain component based on one or more material properties of the powertrain component; determining a temperature of a particular structure within the powertrain component; and determining, using a Rainflow algorithm, a number of temperature cycles until failure of the particular structure based on the temperature of the particular structure.
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Patent Agency Ranking
公开(公告)号：US20230358809A1
公开(公告)日：2023-11-09
申请号：US17911554
申请日：2021-03-19
Applicant: Shiva GARAEI , Chunyan LAI , Gerd SCHLAGER , Lakshmi Varaha IYER , Philip KORTA
Inventor： Shiva GARAEI , Chunyan LAI , Gerd SCHLAGER , Lakshmi Varaha IYER , Philip KORTA
CPC classification number: G01R31/34 , G01R19/0038 , G01R19/02 , H02K1/276
Abstract: Permanent magnet (PM) flux strength in a permanent magnet synchronous machine (PMSM) can be affected by operating conditions including thermal, mechanical, environmental and electrical stresses. Reduced flux strength, also called demagnetization, can lead to the degradation of the efficiency, performance and reliability of the machine and the drive system. A reliable PM strength, PM flux linkage, PM SOH, PM demagnetization detection method using the same inverter (i.e. motor drive) used to operate the PMSM is provided. The method comprises applying phase voltages to each of a plurality of motor leads of the PMSM with the PMSM at a stand-still condition; measuring current in each of the plurality of motor leads of the PMSM while applying the phase voltages thereto; and determining at least one of flux linkage, PM strength, PM SoH, or PM demagnetization based on a value of the current in at least one of the motor leads.
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公开(公告)号：US20220007551A1
公开(公告)日：2022-01-06
申请号：US17293494
申请日：2019-11-13
Applicant: Vimaldoss JESUDHAS , Ram BALACHANDAR , Ron BARRON , Narayan KAR , Martin WINTER , Gerd SCHLAGER , Lakshmi Varaha IYER , MAGNA INTERNATIONAL INC.
Inventor： Vimaldoss JESUDHAS , Ram BALACHANDAR , Ron BARRON , Narayan KAR , Martin WINTER , Gerd SCHLAGER , Lakshmi Varaha IYER
Abstract: A coldplate for removing heat from one or more heat sources, such as power electronics devices, includes a baseplate including a first surface in thermally-conductive communication with the heat sources. The baseplate includes a second surface opposite the first surface to transfer heat into a cooling fluid in contact therewith. The second surface includes a peripheral flange surrounding a central region having a plurality of parallel ribs, which increase the surface area to improve heat transfer from the baseplate and into the fluid. A housing abuts the peripheral flange of the baseplate to define a cooling passage for circulation of the cooling fluid. A jet-array plate subdivides the cooling passage into a supply header and a main channel and defines a plurality of orifices to convey the fluid into the main channel and to direct the fluid toward predetermined zones on the baseplate.
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公开(公告)号：US20250008694A1
公开(公告)日：2025-01-02
申请号：US18882985
申请日：2024-09-12
Applicant: Ram BALACHANDAR , Abishek SRIDHAR , Lakshmi Varaha IYER , Gerd SCHLAGER
Inventor： Ram BALACHANDAR , Abishek SRIDHAR , Lakshmi Varaha IYER , Gerd SCHLAGER
Abstract: An impingement cooling system includes a porous heat spreader and a nozzle configured to direct a fluid as a jet and/or as a spray impinging upon the porous heat spreader. The porous heat spreader is made of a thermally-conductive material such as a metal, metal alloy, carbon/graphite, or ceramic, and is in thermal contact with a heat source. The nozzle may be configured to direct the fluid as a jet comprising a single component liquid or gas (including air) or a liquid mixture such as water-glycol or other coolants. The nozzle may be configured to direct the fluid as a spray comprising a single component liquid or gas (including air) or a liquid mixture such as water-glycol or other coolants. The cooling system may include one or more nozzles, which may direct the cooling fluid orthogonally or at an oblique angle to an impingement plate.
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公开(公告)号：US12166384B2
公开(公告)日：2024-12-10
申请号：US17440860
申请日：2020-03-19
Applicant: MAGNA INTERNATIONAL INC. , Lakshmi Varaha Iyer , Gerd Schlager , Alexander Exl , Mitch Reedy
Inventor： Lakshmi Varaha Iyer , Gerd Schlager , Alexander Exl , Mitch Reedy
Abstract: An electromagnetic machine includes a stator that includes a back plate and a plurality of electrical conductors radially disposed on the back plate. The electromagnetic machine also includes a rotor that includes a body having an outer diameter corresponding to an inner diameter of the stator and at least one magnet having a first end disposed proximate the stator and a second end disposed opposite the first end. The electromagnetic machine also includes an engaging member disposed on a shaft that extends axially relative to the rotor, the engaging member being configured to engage at least one recessed portion of the rotor.
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公开(公告)号：US20230179060A1
公开(公告)日：2023-06-08
申请号：US17925950
申请日：2021-05-18
Applicant: Abishek SRIDHAR , Ram BALACHANDAR , Ronald Michael BARRON , Lakshmi Varaha IYER , Gerd SCHLAGER , Martin WINTER
Inventor： Abishek SRIDHAR , Ram BALACHANDAR , Ronald Michael BARRON , Lakshmi Varaha IYER , Gerd SCHLAGER , Martin WINTER
Abstract: A cooling jacket for an electric motor comprises a fluid passage disposed adjacent to a stator and configured to convey a cooling fluid. The cooling jacket includes a flow mixing enhancer within the fluid passage adjacent an axial end of the stator. The flow mixing enhancer includes baffles, a porous fibrous structure, and/or an open-cell foam to provide greater thermal conductance at a region adjacent to the axial ends than it provides to a central region therebetween. A flow bridge directs the cooling fluid through circumferential flow paths adjacent to both of the axial ends before the cooling fluid is circulated in a central flow path around the central region of the stator. One or more nozzles direct a jet of cooling fluid upon the stator end winding, a rotor end winding, and/or printed circuit board. A ring-shaped coolant header may supply the cooling fluid to the nozzles.
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