公开(公告)号：US20240250576A1

公开(公告)日：2024-07-25

申请号：US18290369

申请日：2022-05-12

申请人： Majed ETEMADI ,  Corey Jerome KLINKHAMER ,  Ram BALACHANDAR ,  Ronald BARRON ,  Lakshmi Varaha IYER ,  MAGNA INTERNATIONAL INC.

发明人： Majed ETEMADI ,  Corey Jerome KLINKHAMER ,  Ram BALACHANDAR ,  Ronald BARRON ,  Lakshmi Varaha IYER

IPC分类号： H02K5/20

CPC分类号： H02K5/203

摘要： 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.

公开(公告)号：US20220007551A1

公开(公告)日：2022-01-06

申请号：US17293494

申请日：2019-11-13

申请人： Vimaldoss JESUDHAS ,  Ram BALACHANDAR ,  Ron BARRON ,  Narayan KAR ,  Martin WINTER ,  Gerd SCHLAGER ,  Lakshmi Varaha IYER ,  MAGNA INTERNATIONAL INC.

发明人： Vimaldoss JESUDHAS ,  Ram BALACHANDAR ,  Ron BARRON ,  Narayan KAR ,  Martin WINTER ,  Gerd SCHLAGER ,  Lakshmi Varaha IYER

IPC分类号： H05K7/20 ,  H05K1/02

摘要： 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.

公开(公告)号：US20230179060A1

公开(公告)日：2023-06-08

申请号：US17925950

申请日：2021-05-18

申请人： Abishek SRIDHAR ,  Ram BALACHANDAR ,  Ronald Michael BARRON ,  Lakshmi Varaha IYER ,  Gerd SCHLAGER ,  Martin WINTER

发明人： Abishek SRIDHAR ,  Ram BALACHANDAR ,  Ronald Michael BARRON ,  Lakshmi Varaha IYER ,  Gerd SCHLAGER ,  Martin WINTER

IPC分类号： H02K5/20 ,  H02K9/197 ,  H02K3/24

CPC分类号： H02K5/203 ,  H02K9/197 ,  H02K3/24

摘要： 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.

公开(公告)号：US20220286040A1

公开(公告)日：2022-09-08

申请号：US17635904

申请日：2020-08-14

申请人： Wolfgang BAECK ,  Michael NEUDORFHOFER ,  Gerd SCHLAGER ,  Lakshmi Varaha IYER ,  Philip KORTA ,  MAGNA INTERNATIONAL INC.

发明人： Wolfgang BAECK ,  Michael NEUDORFHOFER ,  Gerd SCHLAGER ,  Lakshmi Varaha IYER ,  Philip KORTA

IPC分类号： H02M1/15 ,  H02M1/00 ,  H02M3/158

摘要： A power electronic converter supplies DC output power to an output bus for supplying a load, such as a battery. The power electronic converter includes a DC link capacitor configured to provide a DC link voltage with a ripple of 80 V peak-to-peak. The power electronic converter also includes a DC/DC stage having a DC/AC converter that includes one or more switches to selectively conduct current from the DC link bus to supply an AC power to a transformer. The switches of the DC/AC converter are mounted to an insulated metal substrate that is in thermal contact with a transformer housing for dissipating heat therefrom. A controller controls one or more switches of the DC/AC converter and varies a switching frequency responsive to the ripple of the DC link voltage.

公开(公告)号：US20240055916A1

公开(公告)日：2024-02-15

申请号：US17766291

申请日：2020-10-02

申请人： Philip KORTA ,  Lakshmi Varaha IYER ,  Gerd SCHLAGER ,  MAGNA INTERNATIONAL INC.

发明人： Philip KORTA ,  Lakshmi Varaha IYER ,  Gerd SCHLAGER

IPC分类号： H02K1/24 ,  H02K1/22

CPC分类号： H02K1/24 ,  H02K1/223

摘要： A rotor for a wound-field synchronous machine (WFSM) comprises a core having a base with a ring-shaped cross-section extending between an outside surface and an inside surface defining a bore. The rotor also comprises a plurality of field windings spaced apart from one another at regular angular intervals and each extending around the base of the core, adjacent the outside surface and through the bore. Rotor field windings having radial, or spoke configurations are provided. Rotor field windings having V-shaped arrangements, in which two field windings each contribute to the production of each pole, are also provided. Rotors having permanent magnets in addition to field windings are also provided.

公开(公告)号：US20220166275A1

公开(公告)日：2022-05-26

申请号：US17440860

申请日：2020-03-19

申请人： Lakshmi Varaha IYER ,  Gerd SCHLAGER ,  Alexander EXL ,  Mitch REEDY ,  MAGNA INTERNATIONAL INC.

发明人： Lakshmi Varaha IYER ,  Gerd SCHLAGER ,  Alexander EXL ,  Mitch REEDY

IPC分类号： H02K1/276 ,  H02K3/24 ,  H02K9/19 ,  H02K1/278 ,  H02K3/52

摘要： 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.

公开(公告)号：US20220103083A1

公开(公告)日：2022-03-31

申请号：US17425574

申请日：2020-01-24

申请人： Xiang ZHOU ,  Wenbo LIU ,  Bo SHENG ,  Yang CHEN ,  Andrew YUREK ,  Yan-Fei LIU ,  Lakshmi Varaha IYER ,  Gerd SCHLAGER ,  Michael NEUDORFHOFER ,  Wolfgang BAECK ,  MAGNA INTERNATIONAL INC.

发明人： Xiang ZHOU ,  Wenbo LIU ,  Bo SHENG ,  Yang CHEN ,  Andrew YUREK ,  Yan-Fei LIU ,  Lakshmi Varaha IYER ,  Gerd SCHLAGER ,  Michael NEUDORFHOFER ,  Wolfgang BAECK

IPC分类号： H02M3/335 ,  H02M1/44 ,  H02M1/08 ,  B60L53/20

摘要： An LLC power converter comprises a switching stage and a resonant tank, the switching stage configured to switch an input power at a switching frequency to apply a switched power to the resonant tank, and the resonant tank includes a resonant inductor, a resonant capacitor, and a parallel inductance. A transformer has a primary winding connected to the resonant tank and a secondary winding. A synchronous rectifier (SR) switch is configured to selectively switch current from the secondary winding to supply a rectified current to a load. An RC filter includes a filter capacitor and a filter resistor connected across the SR switch, with the filter capacitor defining a filter capacitor voltage thereacross. A rectifier driver is configured to drive the SR switch to a conductive state in response to the filter capacitor voltage being less than a threshold value.

公开(公告)号：US20220094272A1

公开(公告)日：2022-03-24

申请号：US17425656

申请日：2020-01-24

申请人： Wenbo LIU ,  Yang CHEN ,  Xiang ZHOU ,  Andrew YUREK ,  Mojtaba FOROUZESH ,  Bo SHENG ,  Sam WEBB ,  Yan-fei LIU ,  Lakshmi Varaha IYER ,  Gerd SCHLAGER ,  Michael NEUDORFHOFER ,  Wolfgang BAECK ,  MAGNA INTERNATIONAL INC.

发明人： Wenbo LIU ,  Yang CHEN ,  Xiang ZHOU ,  Andrew YUREK ,  Mojtaba FOROUZESH ,  Bo SHENG ,  Sam WEBB ,  Yan-Fei LIU ,  Lakshmi Varaha IYER ,  Gerd SCHLAGER ,  Michael NEUDORFHOFER ,  Wolfgang BAECK

IPC分类号： H02M3/335 ,  H01F27/28 ,  H01F27/40 ,  H01F30/10 ,  H02M7/48

摘要： An inductor-inductor-capacitor (EEC) power converter with high efficiency for Electric Vehicle (EV) on-board low voltage DC-DC chargers (LDC) is disclosed. The converter includes a switching bridge with a plurality of bridge switches and configured to generate an output from a direct current input voltage. An EEC tank circuit is coupled to the switching bridge and includes a resonant inductor and a resonant capacitor and a parallel inductor connected between the resonant inductor and the resonant capacitor. The tank circuit is configured to output a resonant sinusoidal current from the output of the switching bridge. At least one transformer has at least one primary winding in parallel with the parallel inductor of the inductor-inductor-capacitor tank circuit and at least one secondary winding. At least one rectifier is coupled to the at least one secondary winding and is configured to output a rectified alternating current.

公开(公告)号：US20230010253A1

公开(公告)日：2023-01-12

申请号：US17784868

申请日：2020-12-11

申请人： Ram BALACHANDAR ,  Abishek SRIDHAR ,  Lakshim Varaha IYER ,  Gerd SCHLAGER ,  MAGNA INTERNATIONAL INC.

发明人： Ram BALACHANDAR ,  Abishek SRIDHAR ,  Lakshmi Varaha IYER ,  Gerd SCHLAGER

IPC分类号： H05K7/20 ,  F28F13/00

摘要： 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.

公开(公告)号：US20190260325A1

公开(公告)日：2019-08-22

申请号：US16280778

申请日：2019-02-20

申请人： Jiangbo TIAN ,  Chunyan LAI ,  Junxi CAI ,  Narayan Chandra KAR ,  Debmalya BANERJEE ,  Ze LI ,  Jasmin Jijina SINKULAR ,  Lakshmi Varaha IYER

发明人： Jiangbo TIAN ,  Chunyan LAI ,  Junxi CAI ,  Narayan Chandra KAR ,  Debmalya BANERJEE ,  Ze LI ,  Jasmin Jijina SINKULAR ,  Lakshmi Varaha IYER

IPC分类号： H02P27/06 ,  H02P23/14

摘要： A motor drive for providing AC power to an electric motor includes a DC bus and three output terminals for connection to the electric motor. A positive switch selectively connects a positive conductor of the DC bus with each of the output terminals and a negative switch selectively connects a negative conductor of the DC bus with each of the output terminals. Each of the switches are Gallium Nitride (GaN) power switches. A controller commands each of the switches at a high switching speed between 10 kHz and 100 kHz using pulse width modulation to approximate an AC waveform on each of the output terminals. A dead time between activation of corresponding two of the switches conn to be selected to minimize a fifth-order harmonic distortion current.