Patents by Inventor Yohji Okada
Yohji Okada 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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Patent number: 7800269Abstract: In a hybrid magnetic bearing, the electromagnet has a core wound with a control coil and has a main pole and a commutating pole with a commutating pole permanent magnet provided approximately parallel to each other at predetermined intervals in a protruding condition radially or axially to the rotor. In the magnetic bearing provided radially, two electromagnets are placed oppositely to each other across the rotor in an approximately horizontal position, and the rotor is arranged so as to have a predetermined gap with the main pole and the commutating pole, and the permanent magnet is provided between the adjacent electromagnets. In the magnetic bearing provided axially, two electromagnets are placed in parallel in an approximately horizontal position, and the rotor is arranged so as to have a predetermined gap with the main pole and the commutating pole, and the permanent magnet is provided between the adjacent electromagnets.Type: GrantFiled: June 12, 2009Date of Patent: September 21, 2010Assignee: Iwaki Co., Ltd.Inventors: Hiroyuki Onuma, Toru Masuzawa, Yohji Okada
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Patent number: 7683514Abstract: In a hybrid magnetic bearing, the electromagnet has a core wound with a control coil and has a main pole and a commutating pole with a commutating pole permanent magnet provided approximately parallel to each other at predetermined intervals in a protruding condition radially or axially to the rotor. In the magnetic bearing provided radially, two electromagnets are placed oppositely to each other across the rotor in an approximately horizontal position, and the rotor is arranged so as to have a predetermined gap with the main pole and the commutating pole, and the permanent magnet is provided between the adjacent electromagnets. In the magnetic bearing provided axially, two electromagnets are placed in parallel in an approximately horizontal position, and the rotor is arranged so as to have a predetermined gap with the main pole and the commutating pole, and the permanent magnet is provided between the adjacent electromagnets.Type: GrantFiled: August 30, 2006Date of Patent: March 23, 2010Assignee: Iwaki Co., LtdInventors: Hiroyuki Onuma, Toru Masuzawa, Yohji Okada
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Publication number: 20090315421Abstract: In a hybrid magnetic bearing, the electromagnet has a core wound with a control coil and has a main pole and a commutating pole with a commutating pole permanent magnet provided approximately parallel to each other at predetermined intervals in a protruding condition radially or axially to the rotor. In the magnetic bearing provided radially, two electromagnets are placed oppositely to each other across the rotor in an approximately horizontal position, and the rotor is arranged so as to have a predetermined gap with the main pole and the commutating pole, and the permanent magnet is provided between the adjacent electromagnets. In the magnetic bearing provided axially, two electromagnets are placed in parallel in an approximately horizontal position, and the rotor is arranged so as to have a predetermined gap with the main pole and the commutating pole, and the permanent magnet is provided between the adjacent electromagnets.Type: ApplicationFiled: June 12, 2009Publication date: December 24, 2009Applicant: IWAKI CO., LTD.Inventors: Hiroyuki ONUMA, Toru MASUZAWA, Yohji OKADA
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Publication number: 20090079284Abstract: In a hybrid magnetic bearing, the electromagnet has a core wound with a control coil and has a main pole and a commutating pole with a commutating pole permanent magnet provided approximately parallel to each other at predetermined intervals in a protruding condition radially or axially to the rotor. In the magnetic bearing provided radially, two electromagnets are placed oppositely to each other across the rotor in an approximately horizontal position, and the rotor is arranged so as to have a predetermined gap with the main pole and the commutating pole, and the permanent magnet is provided between the adjacent electromagnets. In the magnetic bearing provided axially, two electromagnets are placed in parallel in an approximately horizontal position, and the rotor is arranged so as to have a predetermined gap with the main pole and the commutating pole, and the permanent magnet is provided between the adjacent electromagnets.Type: ApplicationFiled: August 30, 2006Publication date: March 26, 2009Applicant: IWAKI CO., LTD.Inventors: Hiroyuki Onuma, Toru Masuzawa, Yohji Okada
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Patent number: 6885121Abstract: The flux densities formed by plural electromagnet poles M1 to M12 which are arranged at a predetermined interval in a circumferential direction of a rotary body 1 at the same position in an axial direction of the rotary body 1 are gradually changed in the circumferential direction of the rotary body. Even if there is a difference between the maximum value of the flux density and the minimum value, the change of the flux densities between the adjacent electromagnet poles is small and smooth. Accordingly satisfactory detective sensitivity and detection results can be obtained.Type: GrantFiled: July 4, 2002Date of Patent: April 26, 2005Assignee: Sankyo Seiki Mfg. Co. Ltd.Inventors: Yohji Okada, Hideki Kanebako, Keisuke Abe
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Publication number: 20040150278Abstract: The flux densities formed by plural electromagnet poles M1 to M12 which are arranged at a predetermined interval in a circumferential direction of a rotary body 1 at the same position in an axial direction of the rotary body 1 are gradually changed in the circumferential direction of the rotary body. Even if there is a difference between the maximum value of the flux density and the minimum value, the change of the flux densities between the adjacent electromagnet poles is small and smooth. Accordingly satisfactory detective sensitivity and detection results can be obtained.Type: ApplicationFiled: April 7, 2004Publication date: August 5, 2004Inventors: Yohji Okada, Hideki Kanebako, Keisuke Abe
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Patent number: 6753631Abstract: A magnetic levitation motor has a rotor with a rotor magnet magnetized in multiple poles, and a stator with rotor driving coils disposed confronting to the rotor magnet for generating a rotational torque on the rotor, and bearing coils for generating a bearing force in a direction perpendicular to a rotational axis of the rotor. The rotor driving coils and the bearing coils are shifted with respect to one another in a circumferential direction to avoid overlapping with one another. A displacement sensor is provided for detecting displacement of the rotor with respect to a plane that is perpendicular to the rotational axis of the rotor, wherein the rotor is rotated by the rotor driving coils, and the currents flowing in the bearing coils are controlled in accordance with output of the displacement sensor to keep the rotational axis of the rotor at a predetermined position.Type: GrantFiled: April 19, 2002Date of Patent: June 22, 2004Assignee: Sankyo Seiki Mfg., Ltd.Inventors: Hideki Kanebako, Yohji Okada
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Patent number: 6635976Abstract: A magnetic levitation motor has a rotator body formed from a magnetic member and having segmented permanent magnets attached to a peripheral surface thereof. Two magnetic levitation motor sections are disposed in an axial direction of the rotator body. Each of the magnetic levitation motor sections having a first stator winding that generates a levitation control magnetic flux for levitating the rotator body and a second stator winding that generates a rotation magnetic flux for rotating the rotator body. The segmented permanent magnets are affixed to the rotator body at the two magnetic levitation motor sections with magnetic polarities thereof mutually opposite to each other. The segmented permanent magnets function as bias magnets that generate a direct-current magnetic flux that radially spreads from within the rotor.Type: GrantFiled: December 28, 2000Date of Patent: October 21, 2003Assignee: Sankyo Seiki Mfg. Co., Ltd.Inventors: Hideki Kanebako, Yohji Okada
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Patent number: 6611073Abstract: A rotor includes four magnetic poles provided in a rotational direction at intervals of 90 degrees. A stator includes a winding group for rotation and a winding group for levitation. Each of the winding groups has concentrated windings spaced at intervals of 30 degrees in a rotational direction to provide induction conductive winding sections at twelve locations. Each two of the induction conductive winding sections spaced at an interval of 90 degrees among the twelve induction conductive winding sections are connected to form one winding set such that six winding sets are formed in total in each of the winding groups. Current for rotation and current for levitation are conducted through the six winding sets in the windings for rotation and levitation to perform rotation and levitation controls of the rotor.Type: GrantFiled: January 29, 2002Date of Patent: August 26, 2003Assignee: Sankyo Seiki Mfg. Co., Ltd.Inventors: Hideki Kanebako, Yohji Okada, Keisuke Abe
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Publication number: 20020180292Abstract: A magnetic levitation motor has a rotor with a rotor magnet magnetized in multiple poles, and a stator with rotor driving coils disposed confronting to the rotor magnet for generating a rotational torque on the rotor, and bearing coils for generating a bearing force in a direction perpendicular to a rotational axis of the rotor. The rotor driving coils and the bearing coils are shifted with respect to one another in a circumferential direction to avoid overlapping with one another. A displacement sensor is provided for detecting displacement of the rotor with respect to a plane that is perpendicular to the rotational axis of the rotor, wherein the rotor is rotated by the rotor driving coils, and the currents flowing in the bearing coils are controlled in accordance with output of the displacement sensor to keep the rotational axis of the rotor at a predetermined position.Type: ApplicationFiled: April 19, 2002Publication date: December 5, 2002Inventors: Hideki Kanebako, Yohji Okada
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Publication number: 20020153790Abstract: A rotor includes four magnetic poles provided in a rotational direction at intervals of 90 degrees. A stator includes a winding group for rotation and a winding group for levitation. Each of the winding groups has concentrated windings spaced at intervals of 30 degrees in a rotational direction to provide induction conductive winding sections at twelve locations. Each two of the induction conductive winding sections spaced at an interval of 90 degrees among the twelve induction conductive winding sections are connected to form one winding set such that six winding sets are formed in total in each of the winding groups. Current for rotation and current for levitation are conducted through the six winding sets in the windings for rotation and levitation to perform rotation and levitation controls of the rotor.Type: ApplicationFiled: January 29, 2002Publication date: October 24, 2002Inventors: Hideki Kanebako, Yohji Okada, Keisuke Abe
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Patent number: 6320290Abstract: A rotor includes a rotor magnet magnetized to have a multiple of magnetic poles. A stator, while confronting with the rotor, includes a rotor driving coil set for generating a rotational torque in the rotor, and a bearing coil set for generating a bearing force having a direction perpendicular to the rotational axis direction of the rotor. The number of magnetic poles of the rotor magnet is eight. The number of coils of the bearing coil set of the stator is six. Displacement sensor is provided for detecting a displacement of the rotor, in a direction perpendicular to the rotational axis of the rotor. The rotor is rotated by the rotor driving coil set. Currents flowing in the bearing coils are controlled in accordance with output of the displacement sensor to hold the rotational axis of the rotor at a predetermined position.Type: GrantFiled: August 18, 2000Date of Patent: November 20, 2001Assignee: Kabushiki Kaisha Sankyo Seiki SeisakushoInventors: Hideki Kanebako, Yohji Okada
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Publication number: 20010013734Abstract: A magnetic levitation motor has a rotator body formed from a magnetic member and having segmented permanent magnets attached to a peripheral surface thereof. Two magnetic levitation motor sections are disposed in an axial direction of the rotator body. Each of the magnetic levitation motor sections having a first stator winding that generates a levitation control magnetic flux for levitating the rotator body and a second stator winding that generates a rotation magnetic flux for rotating the rotator body. The segmented permanent magnets are affixed to the rotator body at the two magnetic levitation motor sections with magnetic polarities thereof mutually opposite to each other. The segmented permanent magnets function as bias magnets that generate a direct-current magnetic flux that radially spreads from within the rotor.Type: ApplicationFiled: December 28, 2000Publication date: August 16, 2001Inventors: Hideki Kanebako, Yohji Okada
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Patent number: 6216653Abstract: An electromagnetic valve actuator for a cylinder valve, including a pair of electromagnets including magnetic cores and coils serially connected and wound around the magnetic cores in the same direction. An armature is moveable against biasing forces of springs in one direction to open the cylinder valve and in the opposite direction to close the cylinder valve. A permanent magnet is prevented from being undesirably influenced by an opposing magnetic field relative to the permanent magnet.Type: GrantFiled: March 31, 2000Date of Patent: April 17, 2001Assignee: Unisia Jecs CorporationInventors: Seinosuke Hara, Yohji Okada