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公开(公告)号：US20230396125A1
公开(公告)日：2023-12-07
申请号：US18032429
申请日：2021-10-01
Applicant: NexFi Technology Inc.
Inventor： Satoshi TANIMOTO , Takashi NAKAMURA
Abstract: A flywheel energy storage system that can not only be miniaturized but also can be dramatically improved in a maximum device mass energy density is provided. The flywheel energy storage system includes a flywheel unit (2) in which flywheel hubs (8A), (8B) that are provided with rotary mass circular wheels (9A), (9B) on outer peripheries thereof are supported on support shafts (5A), (5B), and an electrical motor/generator unit (3) that is provided with a stator unit (10) formed by a coreless induction coil (11i) between the flywheel hubs (8A), (8B) that hold rotor units (12A), (12B) formed by a yokeless annular permanent magnet Halbach array.
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公开(公告)号：US12142915B2
公开(公告)日：2024-11-12
申请号：US17764695
申请日：2020-10-02
Applicant: NEXFI TECHNOLOGY INC.
Inventor： Takashi Nakamura , Satoshi Tanimoto
Abstract: The present invention provides a flywheel having a high energy density, a designing method which facilitates the designing of the flywheel, and an energy storage system which can achieve both an increase in storage energy and a reduction in weight by adopting the flywheel. A flywheel A includes: a low-density disk 10 having a low average density; and a high-density outer edge section 11 which is provided on the outer circumference of the low-density disk 10, and has an average density higher than that of the low-density disk 10.
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公开(公告)号：US20220174811A1
公开(公告)日：2022-06-02
申请号：US17442404
申请日：2020-03-26
Applicant: NexFi Technology Inc. , OSAKA UNIVERSITY
Inventor： Kei NISHIOKA , Toshio HANADA , Takashi NAKAMURA , Tsuyoshi FUNAKI
Abstract: A power substrate (101) of the present invention includes a plurality of insulating substrates (106) arranged side by side along a plurality of current paths (P) extending in the same direction, a plurality of MOS transistors (108) mounted on one major surface of each of the plurality of insulating substrates (106) with a first conductive layer (107) and a first solder bonding layer (109) in between, and a heat dissipation member (110) in contact with other major surfaces of all of the insulating substrates with a second conductive layer (107) and a second solder bonding layer (109) in between, and each of the current paths (P) is formed by connecting one or more of the MOS transistors (108) mounted on one of the insulating substrates (106) with one or more of the MOS transistors (108) mounted on a different one of the insulating substrates (106) in series with each other.
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4.发明公开公开(公告)号：US20240313612A1
公开(公告)日：2024-09-19
申请号：US18274608
申请日：2021-11-18
Applicant: NexFi Technology Inc.
Inventor： Satoshi TANIMOTO , Takashi NAKAMURA
Abstract: A constant stress solid disk rotor of a flywheel has an outer shape having a plane-symmetric upper surface and lower surface, an outer circumferential radius b, and a rotation center thickness h0, and includes a thickness decreasing region which decreases monotonously in thickness from a rotation center to a connection radius a and a constant thickness region located on an outer edge of the thickness decreasing region and having a constant thickness ha from the connection radius a to the outer circumferential radius b. Shape parameters including the outer circumferential radius b, the rotation center thickness h0, the connection radius a, and the outer edge thickness ha satisfy an equation below. Here, ν is a Poisson's ratio of a rotor material.
a
b
=
1
2
(
-
2
1
-
v
(
1
+
v
-
2
ln
(
h
a
h
0
)
)
+
(
2
1
-
v
(
1
+
v
-
2
ln
(
h
a
h
0
)
)
)
2
+
4
(
3
+
v
)
1
-
v
)-
公开(公告)号：US12022604B2
公开(公告)日：2024-06-25
申请号：US17442404
申请日：2020-03-26
Applicant: NexFi Technology Inc. , OSAKA UNIVERSITY
Inventor： Kei Nishioka , Toshio Hanada , Takashi Nakamura , Tsuyoshi Funaki
CPC classification number: H05K1/0203 , H01L25/16 , H05K1/181 , H05K2201/10022 , H05K2201/10166
Abstract: A power substrate (101) of the present invention includes a plurality of insulating substrates (106) arranged side by side along a plurality of current paths (P) extending in the same direction, a plurality of MOS transistors (108) mounted on one major surface of each of the plurality of insulating substrates (106) with a first conductive layer (107) and a first solder bonding layer (109) in between, and a heat dissipation member (110) in contact with other major surfaces of all of the insulating substrates with a second conductive layer (107) and a second solder bonding layer (109) in between, and each of the current paths (P) is formed by connecting one or more of the MOS transistors (108) mounted on one of the insulating substrates (106) with one or more of the MOS transistors (108) mounted on a different one of the insulating substrates (106) in series with each other.
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Patent Agency Ranking
公开(公告)号：US20230285046A1
公开(公告)日：2023-09-14
申请号：US18018950
申请日：2020-08-04
Applicant: OSAKA UNIVERSITY , NexFi Technology Inc.
Inventor： Takashi NAKAMURA , Tsuyoshi FUNAKI , Kiyokazu NAKAJIMA , Yuji KOKUBO
IPC: A61B17/32
CPC classification number: A61B17/320068 , A61B17/320016 , A61B2017/320074
Abstract: A flexible ultrasonic wave generating device (2) is inserted into a flexible tube (10) having flexibility, and an inductor (15), a discharge resistor (21), an FET (22), and an SBD (23) constituting a drive circuit (25) are mounted on first to third flexible substrates (11) to (13). An actuator (14) is connected to the distal end portion of the flexible ultrasonic wave generating device (2). An active blade (30) is attached to the actuator (14).
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公开(公告)号：US20240429780A1
公开(公告)日：2024-12-26
申请号：US18700509
申请日：2022-12-06
Applicant: NexFi Technology Inc.
Inventor： Satoshi TANIMOTO , Takashi NAKAMURA
Abstract: Provided are a hollow disk rotor for a flywheel energy storage system with a significantly improved circumferential velocity limit and stored energy limit, and a method for manufacturing the same. The rotor includes a plurality of circumferentially wound reinforcement fibers, a matrix material that fills gaps between the reinforcement fibers, and carbon nanotubes extending upward through the matrix material from surfaces of the reinforcement fibers as base points.
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公开(公告)号：US20240355562A1
公开(公告)日：2024-10-24
申请号：US18721801
申请日：2023-01-16
Applicant: NexFi Technology Inc.
Inventor： Kei NISHIOKA , Takashi NAKAMURA , Takafumi OKUDA , Satoshi TANIMOTO , Toshio HANADA
CPC classification number: H01H33/596 , H02H3/087
Abstract: A DC circuit breaker 25a includes: a parallel connection part formed of a mechanical switch 40 and a semiconductor switch 44; and a switch control unit 39 which is connected in series to one side of the parallel connection part. The switch control unit 39 detects a main current value i separately from an external equipment-side breaking control device 12, and, when the main current value i is greater than or equal to a threshold α, the switch control unit 39 initiates a breaking operation without having to wait for a tripping signal from the equipment-side breaking control device 12. In this 10 breaking operation, the mechanical switch 40 is switched from on to off after the semiconductor switch 44 has been switched from off to on.
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公开(公告)号：US12119730B2
公开(公告)日：2024-10-15
申请号：US18274608
申请日：2021-11-18
Applicant: NexFi Technology Inc.
Inventor： Satoshi Tanimoto , Takashi Nakamura
Abstract: A constant stress solid disk rotor of a flywheel has an outer shape having a plane-symmetric upper surface and lower surface, an outer circumferential radius b, and a rotation center thickness h0, and includes a thickness decreasing region which decreases monotonously in thickness from a rotation center to a connection radius a and a constant thickness region located on an outer edge of the thickness decreasing region and having a constant thickness ha from the connection radius a to the outer circumferential radius b. Shape parameters including the outer circumferential radius b, the rotation center thickness h0, the connection radius a, and the outer edge thickness ha satisfy an equation below. Here, ν is a Poisson's ratio of a rotor material.
a
b
=
1
2
(
-
2
1
-
v
(
1
+
v
-
2
ln
(
h
a
h
0
)
)
+
(
2
1
-
v
(
1
+
v
-
2
ln
(
h
a
h
0
)
)
)
2
+
4
(
3
+
v
)
1
-
v
)-
公开(公告)号：US20220329102A1
公开(公告)日：2022-10-13
申请号：US17764695
申请日：2020-10-02
Applicant: NEXFI TECHNOLOGY INC.
Inventor： Takashi NAKAMURA , Satoshi TANIMOTO
Abstract: The present invention provides a flywheel having a high energy density, a designing method which facilitates the designing of the flywheel, and an energy storage system which can achieve both an increase in storage energy and a reduction in weight by adopting the flywheel. A flywheel A includes: a low-density disk 10 having a low average density; and a high-density outer edge section 11 which is provided on the outer circumference of the low-density disk 10, and has an average density higher than that of the low-density disk 10.
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