Patents by Inventor Yoshinori Ojima
Yoshinori Ojima has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20190301480Abstract: The present invention relates to a pump apparatus. The pump apparatus includes: an impeller (1) in which a permanent magnet (5) is embedded; a pump casing (2) which houses the impeller (1); a motor stator (6) having a plurality of stator coils (6B); a motor casing (3) which houses the motor stator (6); a bearing assembly (10) which supports the impeller (1); a vibration sensor (30) for detecting a vibration of the bearing assembly (10); and a controller (29) connected to the vibration sensor (30). The controller (29) calculates the rate of change in the vibration based on the vibration detected by the vibration sensor (30) and, when the rate of change in the vibration is higher than a predetermined threshold value, performs at least one of an operation to stop the supply of electric current to the motor stator (6) and an operation to trigger an alarm.Type: ApplicationFiled: December 4, 2017Publication date: October 3, 2019Inventors: Yoshinori OJIMA, Takahiko OGAWA
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Patent number: 10320260Abstract: Provided is a canned motor to be coupled to a vacuum pump and used as a rotary driving source for the vacuum pump. The canned motor includes: a stator core; a rotor provided on an inner side of the stator core; and a non-conductive can provided between the stator core and the rotor. The non-conductive can is configured to separate the stator core and the rotor from each other. The non-conductive can is made of resin, ceramic, or composite material thereof. The non-conductive can is bonded to the stator core with an adhesive.Type: GrantFiled: February 20, 2017Date of Patent: June 11, 2019Assignee: EBARA CORPORATIONInventors: Takashi Hozumi, Naoya Yoshida, Yoshinori Ojima, Takanori Inada, Toshiharu Nakazawa, Atsushi Oyama
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Publication number: 20170179783Abstract: Provided is a canned motor to be coupled to a vacuum pump and used as a rotary driving source for the vacuum pump. The canned motor includes: a stator core; a rotor provided on an inner side of the stator core; and a non-conductive can provided between the stator core and the rotor. The non-conductive can is configured to separate the stator core and the rotor from each other. The non-conductive can is made of resin, ceramic, or composite material thereof. The non-conductive can is bonded to the stator core with an adhesive.Type: ApplicationFiled: February 20, 2017Publication date: June 22, 2017Inventors: Takashi HOZUMI, Naoya YOSHIDA, Yoshinori OJIMA, Takanori INADA, Toshiharu NAKAZAWA, Atsushi OYAMA
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Patent number: 9660496Abstract: Provided is a canned motor to be coupled to a vacuum pump and used as a rotary driving source for the vacuum pump. The canned motor includes: a stator core; a rotor provided on an inner side of the stator core; and a non-conductive can provided between the stator core and the rotor. The non-conductive can is configured to separate the stator core and the rotor from each other. The non-conductive can is made of resin, ceramic, or composite material thereof. The non-conductive can is bonded to the stator core with an adhesive.Type: GrantFiled: September 18, 2015Date of Patent: May 23, 2017Assignee: Ebara CorporationInventors: Takashi Hozumi, Naoya Yoshida, Yoshinori Ojima, Takanori Inada, Toshiharu Nakazawa, Atsushi Oyama
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Patent number: 9614411Abstract: Provided is a canned motor to be coupled to a vacuum pump and used as a rotary driving source for the vacuum pump. The canned motor includes: a stator core; a rotor provided on an inner side of the stator core; and a non-conductive can provided between the stator core and the rotor. The non-conductive can is configured to separate the stator core and the rotor from each other. The non-conductive can is made of resin, ceramic, or composite material thereof. The non-conductive can is bonded to the stator core with an adhesive.Type: GrantFiled: March 28, 2013Date of Patent: April 4, 2017Assignee: Ebara CorporationInventors: Takashi Hozumi, Naoya Yoshida, Yoshinori Ojima, Takanori Inada, Toshiharu Nakazawa, Atsushi Oyama
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Patent number: 9429166Abstract: A sealing structure for a vacuum pump motor which maintains the sealing properties of the vacuum pump motor in an ensured fashion, including a lead wire which is passed through an opening portion formed in a motor frame to be connected to a motor stator and a seal member which seals the opening portion. The lead wire includes a core wire portion and a covering portion which covers the core wire portion. The lead wire also includes a seal portion formed around at least part of the core wire portion inside the covering portion.Type: GrantFiled: August 6, 2013Date of Patent: August 30, 2016Assignee: EBARA CORPORATIONInventors: Takanori Inada, Naoya Yoshida, Takashi Hozumi, Yoshinori Ojima, Toshiharu Nakazawa
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Patent number: 9291155Abstract: In order to provide a vacuum pump motor which is free from rotation imbalance, there is provided a vacuum pump motor 10 which is connected directly to a pump main shaft 21 of a vacuum pump 20, including a motor rotor 120 which is attached directly or indirectly to the pump main shaft 21 and balance rings 127 which are attached directly or indirectly to the pump main shaft 21 at ends thereof which are spaced apart from end portions of a rotor core 123, wherein the balance rings 127 contain a material having anticorrosion properties.Type: GrantFiled: June 25, 2013Date of Patent: March 22, 2016Assignee: EBARA CORPORATIONInventors: Yoshinori Ojima, Takashi Hozumi, Naoya Yoshida, Takanori Inada, Toshiharu Nakazawa
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Publication number: 20160013698Abstract: Provided is a canned motor to be coupled to a vacuum pump and used as a rotary driving source for the vacuum pump. The canned motor includes: a stator core; a rotor provided on an inner side of the stator core; and a non-conductive can provided between the stator core and the rotor. The non-conductive can is configured to separate the stator core and the rotor from each other. The non-conductive can is made of resin, ceramic, or composite material thereof. The non-conductive can is bonded to the stator core with an adhesive.Type: ApplicationFiled: September 18, 2015Publication date: January 14, 2016Inventors: Takashi HOZUMI, Naoya YOSHIDA, Yoshinori OJIMA, Takanori INADA, Toshiharu NAKAZAWA, Atsushi OYAMA
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Publication number: 20140241914Abstract: In order to provide a motor rotor in which a permanent magnet is prevented from corroding, wherein a motor rotor for use in a motor for driving a pump rotor rotating shaft of a vacuum pump is provided which comprises a rotor core made up of a plurality of steel plates which are laminated in an axial direction and having a through hole, a permanent magnet which is disposed in the through hole, and end plates which are attached individually to axial end portions of the rotor core, wherein an adhesive is applied to a whole surface of each of the plurality of steel plates, and the plurality of steel plates are surface joined to each other and to the end plates via the adhesive.Type: ApplicationFiled: June 27, 2013Publication date: August 28, 2014Inventors: Yoshinori OJIMA, Takanori INADA, Naoya YOSHIDA, Toshiharu NAKAZAWA, Kozo MATAKE
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Publication number: 20140056733Abstract: In order to provide a vacuum pump motor which is free from rotation imbalance, there is provided a vacuum pump motor 10 which is connected directly to a pump main shaft 21 of a vacuum pump 20, including a motor rotor 120 which is attached directly or indirectly to the pump main shaft 21 and balance rings 127 which are attached directly or indirectly to the pump main shaft 21 at ends thereof which are spaced apart from end portions of a rotor core 123, wherein the balance rings 127 contain a material having anticorrosion properties.Type: ApplicationFiled: June 25, 2013Publication date: February 27, 2014Inventors: Yoshinori OJIMA, Takashi HOZUMI, Naoya YOSHIDA, Takanori INADA, Toshiharu NAKAZAWA
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Publication number: 20140050605Abstract: To provide a sealing structure for a vacuum pump motor which maintains the sealing properties of the vacuum pump motor in an ensured fashion, there is provided a sealing structure for a vacuum pump motor 100, including a lead wire 151a which is passed through an opening portion 143 formed in a motor frame 140 to be connected to a motor stator 110 and a seal member 145 which seals the opening portion 143, wherein the lead wire 151a includes a core wire portion 154a and a covering portion 155a which covers the core wire portion 154, and a seal portion 153 is formed in at least part of the core wire portion 154a.Type: ApplicationFiled: August 6, 2013Publication date: February 20, 2014Applicant: EBARA CORPORATIONInventors: Takanori INADA, Naoya YOSHIDA, Takashi HOZUMI, Yoshinori OJIMA, Toshiharu NAKAZAWA
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Publication number: 20130272904Abstract: Provided is a canned motor to be coupled to a vacuum pump and used as a rotary driving source for the vacuum pump. The canned motor includes: a stator core; a rotor provided on an inner side of the stator core; and a non-conductive can provided between the stator core and the rotor. The non-conductive can is configured to separate the stator core and the rotor from each other. The non-conductive can is made of resin, ceramic, or composite material thereof. The non-conductive can is bonded to the stator core with an adhesive.Type: ApplicationFiled: March 28, 2013Publication date: October 17, 2013Inventors: Takashi Hozumi, Naoya Yoshida, Yoshinori Ojima, Takanori Inada, Toshiharu Nakazawa, Atsushi Oyama
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Patent number: 8251678Abstract: The present invention relates to a dry vacuum pump unit capable of achieving ultimate pressure of about 1 Pa. The vacuum pump unit includes a main pump (15) disposed at an outside-pressure side, and a booster pump (16) disposed at a vacuum side. The booster pump (16) and the main pump (15) are coupled in series. The booster pump (16) has a higher pumping speed than that of the main pump (15). Each of the main pump (15) and the booster pump (16) includes a pair of pump rotors (52a and 52b), a casing (50) having an inlet port and an outlet port, and a pair of magnet rotors (54 and 54) rotatable with the pair of pump rotors.Type: GrantFiled: January 29, 2007Date of Patent: August 28, 2012Assignee: Ebara CorporationInventors: Takashi Hozumi, Nobuhito Miyashita, Takanori Inada, Kozo Matake, Yoshinori Ojima, Susumu Miyake, Katsuaki Usui
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Publication number: 20090047142Abstract: The present invention relates to a dry vacuum pump unit capable of achieving ultimate pressure of about 1 Pa. The vacuum pump unit includes a main pump (15) disposed at an outside-pressure side, and a booster pump (16) disposed at a vacuum side. The booster pump (16) and the main pump (15) are coupled in series. The booster pump (16) has a higher pumping speed than that of the main pump (15). Each of the main pump (15) and the booster pump (16) includes a pair of pump rotors (52a and 52b), a casing (50) having an inlet port and an outlet port, and a pair of magnet rotors (54 and 54) rotatable with the pair of pump rotors.Type: ApplicationFiled: January 29, 2007Publication date: February 19, 2009Applicants: EBARA DENSAN LTD., EBARA CORPORATIONInventors: Takashi Hozumi, Nobuhito Miyashita, Takanori Inada, Kozo Matake, Yoshinori Ojima, Susumu Miyake, Katsuaki Usui
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Patent number: 6902380Abstract: A vacuum pump has a casing having an inlet port and an outlet port, and a pair of confronting pump rotors which are provided inside the casing and synchronously rotatable for drawing in a gas from the inlet port and discharging the gas from the outlet port. A motor for rotating the confronting pump rotors is a permanent magnet motor having a stator and a motor rotor. The motor rotor has an iron core and permanent magnets disposed within the iron core.Type: GrantFiled: June 3, 2002Date of Patent: June 7, 2005Assignee: Ebara CorporationInventors: Yoshinori Ojima, Kozo Matake, Takanori Inada, Kiyoshi Yanagisawa
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Publication number: 20040213686Abstract: A multishaft electric motor has a plurality of juxtaposed rotors having respective permanent magnets disposed therearound, and a plurality of sets of armature elements disposed fully circumferentially around the rotors, respectively, the permanent magnets of adjacent two of the rotors having a plurality of pairs of unlike magnetic poles for magnetically coupling the rotors through the armature elements between the permanent magnets. A positive-displacement vacuum pump includes a casing, a pair of pump rotors rotatably disposed in the casing in confronting relation to each other, and a two-shaft electric motor coupled to the pump rotors for rotating the pump rotors in opposite directions. The two-shaft electric motor may comprise a pair of juxtaposed rotors and a pair of sets of armature elements disposed fully circumferentially around the rotors, respectively.Type: ApplicationFiled: May 24, 2004Publication date: October 28, 2004Applicant: EBARA CORPORATIONInventors: Yoshinori Ojima, Kozo Matake, Genichi Sato, Yasushi Hisabe, Masami Nagayama, Katsuaki Usui, Hiroaki Ogamino
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Patent number: 6761542Abstract: A multishaft electric motor has a plurality of juxtaposed rotors having respective permanent magnets disposed therearound, and a plurality of sets of armature elements disposed fully circumferentially around the rotors, respectively, the permanent magnets of adjacent two of the rotors having a plurality of pairs of unlike magnetic poles for magnetically coupling the rotors through the armature elements between the permanent magnets. A positive-displacement vacuum pump includes a casing, a pair of pump rotors rotatably disposed in the casing in confronting relation to each other, and a two-shaft electric motor coupled to the pump rotors for rotating the pump rotors in opposite directions. The two-shaft electric motor may comprise a pair of juxtaposed rotors and a pair of sets of armature elements disposed fully circumferentially around the rotors, respectively.Type: GrantFiled: July 16, 2002Date of Patent: July 13, 2004Assignee: Ebara CorporationInventors: Yoshinori Ojima, Kozo Matake, Genichi Sato, Yasushi Hisabe, Masami Nagayama, Katsuaki Usui, Hiroaki Ogamino
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Patent number: 6700273Abstract: A gas transfer machine for use as a vacuum pump, for example, has a pump rotor mounted on a rotatable shaft for transferring a gas, and a reluctance-type motor for rotating the rotatable shaft. The reluctance-type motor has a stator, a motor rotor surrounded by the stator, and a shield member isolating the stator from the motor rotor. The motor rotor is directly coupled to the rotatable shaft and has a plurality of magnetic salient poles.Type: GrantFiled: August 4, 2000Date of Patent: March 2, 2004Assignee: Ebara CorporationInventors: Yoshinori Ojima, Toshiharu Nakazawa, Shinichi Sekiguchi, Nobuharu Noji
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Publication number: 20020197171Abstract: A vacuum pump has a casing having an inlet port and an outlet port, and a pair of confronting pump rotors which are provided in the casing and synchronously rotatable for drawing in a gas from the inlet port and discharging the gas from the outlet port. A motor for rotating the confronting pump rotors is a permanent magnet motor having a stator and a motor rotor. The motor rotor has an iron core and a permanent magnet disposed within the iron core.Type: ApplicationFiled: June 3, 2002Publication date: December 26, 2002Inventors: Yoshinori Ojima, Kozo Matake, Takanori Inada, Kiyoshi Yanagisawa
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Publication number: 20020172599Abstract: A multishaft electric motor has a plurality of juxtaposed rotors having respective permanent magnets disposed therearound, and a plurality of sets of armature elements disposed fully circumferentially around the rotors, respectively, the permanent magnets of adjacent two of the rotors having a plurality of pairs of unlike magnetic poles for magnetically coupling the rotors through the armature elements between the permanent magnets. A positive-displacement vacuum pump includes a casing, a pair of pump rotors rotatably disposed in the casing in confronting relation to each other, and a two-shaft electric motor coupled to the pump rotors for rotating the pump rotors in opposite directions. The two-shaft electric motor may comprise a pair of juxtaposed rotors and a pair of sets of armature elements disposed fully circumferentially around the rotors, respectively.Type: ApplicationFiled: July 16, 2002Publication date: November 21, 2002Applicant: EBARA CORPORATIONInventors: Yoshinori Ojima, Kozo Matake, Genichi Sato, Yasushi Hisabe, Masami Nagayama, Katsuaki Usui, Hiroaki Ogamino