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公开(公告)号：US20220247340A1
公开(公告)日：2022-08-04
申请号：US17623745
申请日：2020-07-20
Applicant: Cummins Inc.
Inventor： Akm Arafat , Dakshina S. Murthy-Bellur
IPC: H02P29/024 , H02P25/22 , G01R31/34
Abstract: A method of operating a multi-phase electric machine includes operating a six-phase machine with six phases that are configured into a first group having a first neutral connection and a second group having a second neutral connection. The method also includes determining whether at least one of the six phases is experiencing a fault. In response to the determining, the method includes combining the first and second neutral connections to form a common neutral connection to continue operating the six-phase machine by using the remaining phase not experiencing the fault.
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公开(公告)号：US12191758B2
公开(公告)日：2025-01-07
申请号：US18026427
申请日：2021-09-08
Applicant: Cummins Inc.
Inventor： Akm Arafat , Moinul S. Haque , Bradford K. Palmer , Patrick Kaufman
IPC: H02P21/22 , B60L50/60 , H02M1/32 , H02M7/5387 , B60K6/40
Abstract: An inverter system is provided such that the system includes a direct-current (DC) voltage supply, an inverter, an electric machine such as a motor, and a controller coupled with the inverter. The inverter has four or more legs, each with two switches operating complementary to each other. The controller can determine which three of the four or more legs are selected to operate the inverter and uses a remaining one of the four or more legs to operate the inverter by activating/deactivating certain switches during null vector state.
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公开(公告)号：US12077056B2
公开(公告)日：2024-09-03
申请号：US18015457
申请日：2021-07-01
Applicant: Cummins Inc.
Inventor： Oliver D. Wilson , Akm Arafat
CPC classification number: B60L53/24 , B60L55/00 , H02J7/02 , H02M7/537 , B60L2210/40 , B60L2220/54 , B60L2220/58 , H02J2310/48
Abstract: A method and system for bidirectional charging in an electric vehicle include controlling a multi-phase machine in the electric vehicle. In response to determining that a direction of energy flow is from an electric grid to the electric vehicle, the method and system include operating a first set of phases in the multi-phase machine at a grid frequency of the electric grid and connecting the first set of phases in the multi-phase machine to the electric grid. In response to connecting the first set of phases in the multi-phase machine to the electric grid, the method and system include operating a second set of phases in the multi-phase machine, where the second set of phases in the multi-phase machine generates energy via electrical coupling to the first set of phases in the multi-phase machine. The method and system also include providing the energy generated by the second set of phases in the multi-phase machine to charge an energy source of the electric vehicle.
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公开(公告)号：US20240128844A1
公开(公告)日：2024-04-18
申请号：US18274561
申请日：2022-01-14
Applicant: Cummins Inc.
Inventor： Md Khurshedul Islam , Akm Arafat
CPC classification number: H02K21/16 , H02K1/276 , H02K3/28 , H02K2201/06
Abstract: Six-phase permanent magnet-type electric machines are disclosed. The electric machine includes a stator and a rotor configured to operate as a first three-phase electric machine and a second three-phase electric machine. The first and second three-phase electric machines are coupled with each other via a fractional slot combination with concentrated windings such that a mechanical separation between the first and second three-phase electric machines is at least 60 mechanical degrees.
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公开(公告)号：US20230412102A1
公开(公告)日：2023-12-21
申请号：US18239915
申请日：2023-08-30
Applicant: Cummins Inc.
Inventor： Akm Arafat , Bradford K. Palmer , Dakshina S. Murthy-Bellur
IPC: H02P21/00 , H02P25/22 , H02P29/028
CPC classification number: H02P21/50 , H02P29/028 , H02P25/22
Abstract: A method of controlling a multi-phase electric machine includes implementing a first control method to control the operation of a six-phase machine that is configured as a combination of two three-phase machines. The method also includes determining whether a fault exists in the six-phase machine. In response to determining that the fault exists in the six-phase machine, the method includes implementing a second and different control method to control the operation of the six-phase machine.
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Patent Agency Ranking
公开(公告)号：US11777437B2
公开(公告)日：2023-10-03
申请号：US17623745
申请日：2020-07-20
Applicant: Cummins Inc.
Inventor： Akm Arafat , Dakshina S. Murthy-Bellur
IPC: H02P29/024 , G01R31/34 , H02P25/22
CPC classification number: H02P29/0243 , G01R31/343 , H02P25/22
Abstract: A method of operating a multi-phase electric machine includes operating a six-phase machine with six phases that are configured into a first group having a first neutral connection and a second group having a second neutral connection. The method also includes determining whether at least one of the six phases is experiencing a fault. In response to the determining, the method includes combining the first and second neutral connections to form a common neutral connection to continue operating the six-phase machine by using the remaining phase not experiencing the fault.
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公开(公告)号：US20220371444A1
公开(公告)日：2022-11-24
申请号：US17765516
申请日：2019-11-22
Applicant: Akm ARAFAT , Santhosh KRISHNAMOORTHI , Dakshina Subbarao MURTHY-BELLUR , Cummins Inc.
Inventor： Akm Arafat , Santhosh Krishnamoorthi , Dakshina Subbarao Murthy-Bellur
Abstract: A method and system of operating a multi-phase electric machine include operating an inverter to control the multi-phase machine. The inverter has a plurality of inverter legs including an auxiliary inverter leg. Each of the plurality of inverter legs has at least one switch device. The multi-phase machine has a plurality of phases in which each phase is controlled by a respective inverter leg of the inverter. The method and system also include determining whether a phase of the multi-phase machine is experiencing a partial phase loss, for example, by injecting a signal into the phases and analyzing the frequency response. In response to determining that a phase of the multi-phase machine is experiencing a partial phase loss, the method and system include utilizing the auxiliary inverter leg to supplement energy to the phase experiencing the partial phase loss to continue operating the multi-phase machine.
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公开(公告)号：US20240391336A1
公开(公告)日：2024-11-28
申请号：US18792221
申请日：2024-08-01
Applicant: Cummins Inc.
Inventor： Oliver D. Wilson , Akm Arafat
Abstract: A method and system for bidirectional charging in an electric vehicle include controlling a multi-phase machine in the electric vehicle. In response to determining that a direction of energy flow is from an electric grid to the electric vehicle, the method and system include operating a first set of phases in the multi-phase machine at a grid frequency of the electric grid and connecting the first set of phases in the multi-phase machine to the electric grid. In response to connecting the first set of phases in the multi-phase machine to the electric grid, the method and system include operating a second set of phases in the multi-phase machine, where the second set of phases in the multi-phase machine generates energy via electrical coupling to the first set of phases in the multi-phase machine. The method and system also include providing the energy generated by the second set of phases in the multi-phase machine to charge an energy source of the electric vehicle.
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公开(公告)号：US12107526B2
公开(公告)日：2024-10-01
申请号：US17923817
申请日：2021-05-05
Applicant: Cummins Inc.
Inventor： Akm Arafat , Minyu Cai , Dakshina S. Murthy-Bellur
CPC classification number: H02P29/64 , H02P23/0004 , H02P27/08
Abstract: A method for operating an electric drive system is provided. For example, a controller retrieves, from memory, a predictive model indicating predictive winding temperatures associated with known negative temperature coefficient (NTC) temperatures, wherein the predictive model is based on historical NTC temperatures and historical winding temperatures, as well as one or more operating parameters. The controller receives current NTC information indicating one or more current NTC readings corresponding to one or more switching devices within the inverter. The controller determines estimated winding temperatures corresponding to the electric machine based on the predictive model and the one or more current NTC readings as well as current operating parameters. The controller provides instructions to adjust inputs to the electric machine based on the estimated winding temperatures.
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公开(公告)号：US20230253873A1
公开(公告)日：2023-08-10
申请号：US18016178
申请日：2021-07-08
Applicant: Cummins Inc.
Inventor： Minyu Cai , Akm Arafat , Bradford K. Palmer , Dakshina S. Murthy-Bellur
IPC: H02M1/14 , H02M7/5395 , H02P5/74 , B60L53/20 , B60L15/08
CPC classification number: H02M1/14 , B60L15/08 , B60L53/20 , H02M7/5395 , H02P5/74
Abstract: An inverter system is provided such that the system includes a direct-current (DC) voltage supply electrically coupled with a DC link, a plurality of inverters, each electrically coupled with the DC link, a plurality of electric machines where each electric machine is electrically coupled with one of the inverters, and a controller coupled with each of the inverters. The controller can control carrier signals of the inverters such that the carrier signals are synchronized and interleaved at an angle (Θ) that is determined based on the waveform type of the carrier signals and the number of inverters in the system.
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