Patents by Inventor Yoji Hashimoto
Yoji Hashimoto 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: 11165315Abstract: A manufacturing method for obtaining an interior permanent magnet-type inner rotor without thermal demagnetization due to shrink fitting to a rotating shaft includes: a shrink fitting step of heating a rotor core having slots and inserting a rotating shaft into a shaft hole to shrinkfit the rotor core; and a filling step of filling the rotor core slots in a residual heat state after the shrink fitting step with a flowable mixture of a binder resin heated to a flowable state and anisotropic magnet particles, in oriented magnetic fields This allows, in similar manufacturing steps, an inner rotor of which the magnetic poles are anisotropic bond magnets formed by solidifying the flowable mixture in the slots and a conventional inner rotor of which the magnetic poles are sintered magnets. This allows both the inner rotors concurrently and in parallel (mixed flow production) in an already existing IPM motor manufacturing line.Type: GrantFiled: May 24, 2019Date of Patent: November 2, 2021Assignee: AICHI STEEL CORPORATIONInventors: Tadashi Fujimaki, Hiroshi Matsuoka, Yoji Hashimoto
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Patent number: 10454353Abstract: An apparatus for manufacturing an interior permanent magnet-type inner rotor and manufacturing method using the same. The apparatus including: a mold having a three-layer structure; the method including a shrink fitting step of heating a rotor core having slots; and a filling step of filling the rotor core slots in a residual heat state after the shrink fitting step with a flowable mixture of a binder resin heated to a flowable state and having anisotropic magnet particles, in oriented magnetic fields. This allows, in similar manufacturing steps, an inner rotor of which magnetic poles are anisotropic bond magnets formed by solidifying the flowable mixture in the slots and a conventional inner rotor of which the magnetic poles are sintered magnets. This allows both the inner rotors concurrently and in parallel (mixed flow production) in an already existing IPM motor manufacturing line.Type: GrantFiled: March 12, 2015Date of Patent: October 22, 2019Assignee: AICHI STEEL CORPORATIONInventors: Tadashi Fujimaki, Hiroshi Matsuoka, Yoji Hashimoto
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Publication number: 20190280576Abstract: A manufacturing method for obtaining an interior permanent magnet-type inner rotor without thermal demagnetization due to shrink fitting to a rotating shaft includes: a shrink fitting step of heating a rotor core having slots and inserting a rotating shaft into a shaft hole to shrinkfit the rotor core; and a filling step of filling the rotor core slots in a residual heat state after the shrink fitting step with a flowable mixture of a binder resin heated to a flowable state and anisotropic magnet particles, in oriented magnetic fields This allows, in similar manufacturing steps, an inner rotor of which the magnetic poles are anisotropic bond magnets formed by solidifying the flowable mixture in the slots and a conventional inner rotor of which the magnetic poles are sintered magnets. This allows both the inner rotors concurrently and in parallel (mixed flow production) in an already existing IPM motor manufacturing line.Type: ApplicationFiled: May 24, 2019Publication date: September 12, 2019Applicant: AICHI STEEL CORPORATIONInventors: Tadashi FUJIMAKI, Hiroshi MATSUOKA, Yoji HASHIMOTO
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Publication number: 20170025933Abstract: A manufacturing method for obtaining an interior permanent magnet-type inner rotor without thermal demagnetization due to shrink fitting to a rotating shaft includes: a shrink fitting step of heating a rotor core having slots and inserting a rotating shaft into a shaft hole to shrink-fit the rotor core; and a filling step of filling the rotor core slots in a residual heat state after the shrink fitting step with a flowable mixture of a binder resin heated to a flowable state and anisotropic magnet particles, in oriented magnetic fields This allows, in similar manufacturing steps, an inner rotor of which the magnetic poles are anisotropic bond magnets formed by solidifying the flowable mixture in the slots and a conventional inner rotor of which the magnetic poles are sintered magnets. This allows both the inner rotors concurrently and in parallel (mixed flow production) in an already existing IPM motor manufacturing line.Type: ApplicationFiled: March 12, 2015Publication date: January 26, 2017Applicant: AICHI STEEL CORPORATIONInventors: Tadashi FUJIMAKI, Hiroshi MATSUOKA, Yoji HASHIMOTO
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Publication number: 20110248591Abstract: An anisotropic bonded magnet molded in a ring shape to be used to excite a brush-equipped direct current motor. A magnetic flux density distribution in each of magnetic pole sections of the ring shape forms an asymmetric distribution which includes a magnetic flux density reduced portion wherein the absolute value rises from a neutral axis opposite to a rotation direction of an armature with a delay with respect to a rotation direction of the armature, and in which the absolute value falls more rapidly than a rise thereof in the rotation direction of the armature with respect to a neutral axis in the rotation direction of the armature.Type: ApplicationFiled: May 6, 2011Publication date: October 13, 2011Applicant: Aichi Steel CorporationInventors: Yoshinobu Honkura, Hironari Mitarai, Hiroshi Matsuoka, Yoji Hashimoto
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Publication number: 20090127958Abstract: The rectifying characteristic of a brush-equipped direct current machine is improved, and the life of the machine is extended. As illustrated in FIG. 2, a magnetic flux density reduced portion in which the magnetic flux density is reduced is formed in a magnetic pole section of an anisotropic bonded magnet. The position in the magnetic pole section formed with the magnetic flux density reduced portion is formed at the position at which, when a rectifier coil moves in a rectification section, the absolute value of the density of a magnetic flux penetrating the rectifier coil is increased due to the influence of the magnetic flux density reduced portion. Thus, an inverse voltage can be induced in the rectifier coil in the direction of inversion current during a rectification period. It is therefore possible to facilitate the inversion of the current, and to compensate for inadequate rectification and improve the rectifying characteristic.Type: ApplicationFiled: August 3, 2006Publication date: May 21, 2009Inventors: Yoshinobu Honkura, Hironari Mitarai, Hiroshi Matsuoka, Yoji Hashimoto
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Patent number: 6917132Abstract: The challenge to be solved by the present invention is the miniaturization of a 1-300 W class of motor. This can be achieved by using a hollow-cylinder shaped anisotropic bonded magnet magnetized in a 4-pole configuration. The anisotropic bonded magnet has a maximum energy product approximately 4 times greater than the conventional sintered ferrite magnets. The use of a 4-pole configuration shortens the magnetic path length of the individual magnetic circuits and the magnetic force contributing to the torque is increased. When the torque is kept the same as in the conventional motor, the length of the electromagnetic rotor core and the axial magnet length can be reduced. In this fashion, 1-300 W class motors can be reduced in size.Type: GrantFiled: December 10, 2002Date of Patent: July 12, 2005Assignee: Aichi Steel CorporationInventors: Yoshinobu Honkura, Yoji Hashimoto, Hironari Mitarai
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Publication number: 20050069435Abstract: A fuel pump with improved pumping performance having a high motor torque and a sufficient cross sectional area of fuel passage is provided. The motor section (2) of the fuel pump has a columnar rotor (21) having a shaft (7) for rotating the pump section (1), and a ring magnet (5, 35, 45, 55, 65, 75, 85) surrounding an outer circumference face of the rotor (21). There is provided a minute clearance between the rotor (21) and the magnet (5, 35, 45, 55, 65, 75, 85). The motor section (2) further has a cylindrical yoke (4, 34, 46, 56, 66) surrounding and contacting an outer circumference face of the magnet (5, 35, 45, 55, 65, 75, 85). A fuel passage (27, 37, 47, 57,67, 77, 87, 97, 127) having a sufficient cross sectional area is formed at a location removed from a magnetic path along which a substantial portion of magnetic flux (F) flows between the rotor (21), the magnet (5, 35, 45, 55, 65, 75, 85), and the yoke (4, 34, 46, 56, 66).Type: ApplicationFiled: September 28, 2004Publication date: March 31, 2005Inventors: Masaki Ikeya, Yoji Hashimoto
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Publication number: 20040201300Abstract: The challenge to be solved by the present invention is the miniaturization of a 1-300 W class of motor. This can be achieved by using a hollow-cylinder shaped anisotropic bonded magnet magnetized in a 4-pole configuration. The anisotropic bonded magnet has a maximum energy product approximately 4 times greater than the conventional sintered ferrite magnets. The use of a 4-pole configuration shortens the magnetic path length of the individual magnetic circuits and the magnetic force contributing to the torque is increased. When the torque is kept the same as in the conventional motor, the length of the electromagnetic rotor core and the axial magnet length can be reduced. In this fashion, 1-300 W class motors can be reduced in size.Type: ApplicationFiled: April 30, 2004Publication date: October 14, 2004Applicant: AICHI STEEL CORPORATIONInventors: Yoshinobu Honkura, Yoji Hashimoto, Hironari Mitarai
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Publication number: 20030111921Abstract: The challenge to be solved by the present invention is the miniaturization of a 1-300 W class of motor. This can be achieved by using a hollow-cylinder shaped anisotropic bonded magnet magnetized in a 4-pole configuration. The anisotropic bonded magnet has a maximum energy product approximately 4 times greater than the conventional sintered ferrite magnets. The use of a 4-pole configuration shortens the magnetic path length of the individual magnetic circuits and the magnetic force contributing to the torque is increased. When the torque is kept the same as in the conventional motor, the length of the electromagnetic rotor core and the axial magnet length can be reduced. In this fashion, 1-300 W class motors can be reduced in size.Type: ApplicationFiled: December 10, 2002Publication date: June 19, 2003Applicant: AICHI STEEL CORPORATIONInventors: Yoshinobu Honkura, Yoji Hashimoto, Hironari Mitarai