公开(公告)号：US11244812B2

公开(公告)日：2022-02-08

申请号：US16387630

申请日：2019-04-18

Applicant: Ebara Corporation

Inventor： Haruka Takeuchi ,  Tomonori Ohashi ,  Ichiju Sato

IPC: H01J37/32 ,  H01F7/06 ,  H01F7/20

Abstract: An electromagnet control device includes a current value determining circuit configured to execute a second process for determining, based on a second function, a value of the current, in the case that the magnetic flux density is to be decreased from that in a first magnetization state, and a fourth process for expanding or reducing the second function by use of a first scaling ratio for transforming it to a fourth function, and determining, based on the fourth function obtained after above transformation, a value of the current, in the case that the magnetic flux density is to be decreased from that in a third magnetization state. The current value determining circuit is further configured to determine the first scaling ratio in such a manner that the second function fits measured data that are obtained in advance by decreasing the magnetic flux density from that in the third magnetization state.

公开(公告)号：US10995765B2

公开(公告)日：2021-05-04

申请号：US14928846

申请日：2015-10-30

Applicant: EBARA CORPORATION

Inventor： Ichiju Sato ,  Hiroshi Sobukawa ,  Toshimitsu Barada ,  Tomonori Ohashi ,  Satoshi Mori

IPC: F04D29/22 ,  F04D13/06 ,  F04D29/048

Abstract: A magnetic levitated pump that does not cause pulsation of a pumped liquid and can suppress the generation of particles, which are liable to be produced by contact of a sliding part, is disclosed. The magnetic levitated pump for magnetically levitating an impeller housed in a pump casing includes a motor configured to rotate the impeller, and an electromagnet configured to magnetically support the impeller. The motor and the electromagnet are arranged so as to face each other across the impeller, and the motor is arranged on the opposite side of a suction port of the pump casing.

公开(公告)号：US11295935B2

公开(公告)日：2022-04-05

申请号：US15572319

申请日：2016-05-09

Applicant: EBARA CORPORATION

Inventor： Tomonori Ohashi ,  Toshimitsu Barada ,  Hironobu Yamasaki ,  Misako Kudo ,  Ichiju Sato

IPC: H01H47/00 ,  H01J37/32 ,  C23C14/35 ,  H01L21/3065 ,  C23C14/34 ,  G01R19/165 ,  H01F7/06 ,  H01F7/20 ,  H01F13/00 ,  H01F27/22

Abstract: The electromagnet device of the present invention comprises: a yoke having an annular groove in a front surface thereof; an annular coil provided in the groove; and an epoxy resin provided on an outer surface of the coil configured to secure the coil to the yoke, wherein there is a clearance between an outer circumferential surface of the groove in the yoke and the epoxy resin provided on an radially outer side of the coil.

公开(公告)号：US20190326091A1

公开(公告)日：2019-10-24

申请号：US16387630

申请日：2019-04-18

Applicant: Ebara Corporation

Inventor： Haruka Takeuchi ,  Tomonori Ohashi ,  Ichiju Sato

IPC: H01J37/32 ,  H01F7/06 ,  H01F7/20

Abstract: An electromagnet control device includes a current value determining circuit configured to execute a second process for determining, based on a second function, a value of the current, in the case that the magnetic flux density is to be decreased from that in a first magnetization state, and a fourth process for expanding or reducing the second function by use of a first scaling ratio for transforming it to a fourth function, and determining, based on the fourth function obtained after above transformation, a value of the current, in the case that the magnetic flux density is to be decreased from that in a third magnetization state. The current value determining circuit is further configured to determine the first scaling ratio in such a manner that the second function fits measured data that are obtained in advance by decreasing the magnetic flux density from that in the third magnetization state.

公开(公告)号：US11662397B2

公开(公告)日：2023-05-30

申请号：US17659684

申请日：2022-04-19

Applicant: EBARA CORPORATION

Inventor： Haruka Takeuchi ,  Tomonori Ohashi ,  Ichiju Sato

IPC: G01R33/022 ,  G01R33/028

CPC classification number: G01R33/022 ,  G01R33/0283

Abstract: A target value of magnetic flux density and magnetic flux density actually obtained are made to coincide precisely with each other. An electromagnet control device comprises a current value determining unit for determining, based on a magnetic flux density instruction value, a value of current that is made to flow through a coil. The current value determining unit is constructed to execute a second process for determining, based on a second function, a value of the current, if the magnetic flux density is to be decreased from that in a first magnetization state, and a fourth process for expanding or reducing the second function by use of a first scaling ratio for transforming it to a fourth function, and determining, based on the fourth function obtained after above transformation, a value of the current, if the magnetic flux density is to be decreased from that in a third magnetization state.

公开(公告)号：US11346896B2

公开(公告)日：2022-05-31

申请号：US16927311

申请日：2020-07-13

Applicant: EBARA CORPORATION

Inventor： Haruka Takeuchi ,  Tomonori Ohashi ,  Ichiju Sato

IPC: G01R33/02 ,  G01R33/022 ,  G01R33/028

Abstract: A target value of magnetic flux density and magnetic flux density actually obtained are made to coincide precisely with each other. An electromagnet control device comprises a current value determining unit for determining, based on a magnetic flux density instruction value, a value of current that is made to flow through a coil. The current value determining unit is constructed to execute a second process for determining, based on a second function, a value of the current, if the magnetic flux density is to be decreased from that in a first magnetization state, and a fourth process for expanding or reducing the second function by use of a first scaling ratio for transforming it to a fourth function, and determining, based on the fourth function obtained after above transformation, a value of the current, if the magnetic flux density is to be decreased from that in a third magnetization state.