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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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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：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
)
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