Patents by Inventor Yutaka Hashiba
Yutaka Hashiba 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: 8362668Abstract: A rotor for a rotating electrical machine suppresses demagnetization of permanent magnets without deteriorating motor characteristics, is low-cost, and is highly reliable. The rotor has a plurality of rotor cores that are stacked together, a plurality of permanent magnets axially divided by the rotor cores and circumferentially arranged on each of the rotor cores, to circumferentially form magnetic irregularities, and a rotor blank made of nonmagnetic material arranged between those of the rotor cores that are adjacent to each other.Type: GrantFiled: November 25, 2008Date of Patent: January 29, 2013Assignees: Kabushiki Kaisha Toshiba, Toshiba Industrial Products Manufacturing CorporationInventors: Norio Takahashi, Mikio Takabatake, Masanori Arata, Kazuto Sakai, Yutaka Hashiba, Wataru Ito, Tadashi Tokumasu, Masakatsu Matsubara
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Publication number: 20120217833Abstract: According to one embodiment, a permanent-magnet type electric rotating machine has a stator, a magnetizing coil, a rotor and a case. The stator has an armature coil configured to form a magnetic circuit for driving. The magnetizing coil is configured to form a magnetic circuit for magnetizing. The rotor has a constant magnetized magnet, a rotor core and a variable magnetized magnet. The rotor core holds the constant magnetized magnet. The constant magnetized magnet is arranged closer to the magnetic circuit for driving than the variable magnetized magnet. The variable magnetized magnet is arranged closer to the magnetic circuit for magnetizing than the constant magnetized magnet.Type: ApplicationFiled: February 23, 2012Publication date: August 30, 2012Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Kazuto SAKAI, Yutaka HASHIBA, Norio TAKKAHASHI, Kazuaki YUUKI, Makoto MATSUSHITA, Daisuke MISU, Masanori ARATA, Tadashi TOKUMASU, Motoyasu MOCHIZUKI, Kuniyuki ARAKI
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Publication number: 20120091848Abstract: An increase of the magnetization current can be prevented during demagnetization and magnetization, and a variable speed operation can be achieved at a high power output over a wide range of from a low speed to a high speed. A rotor (1) is configured by a rotor core (2), a variable magnetic force magnet (3) and a fixed magnetic force magnet (4). A variable magnetic force magnet (3) and a fixed magnetic force magnet (4a) are overlapped in the magnetization direction thereof to form a series of magnets. The series of magnets is located within the rotor core at a position where the magnetization direction is in the direction of a d-axis. On either side of the series of magnets of the variable magnetic force magnet (3) and the fixed magnetic force magnet (4a), fixed magnetic force magnets (4b, 4b) are located at a position where the magnetization direction is in the direction of the d-axis.Type: ApplicationFiled: November 19, 2009Publication date: April 19, 2012Applicant: Kabushkiki Kaisha ToshibaInventors: Kazuto Sakai, Yutaka Hashiba, Norio Takahashi, Kazuaki Yuuki
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Publication number: 20110309706Abstract: According to one embodiment, a rotor 1 has rotor cores 2a, 2b divided in the axial direction. a permanent magnet 30 is mounted at the position of each of the magnetic poles of cores. The permanent magnet 30 of each magnetic pole is configured by a single tabular member that penetrates the two divided cores in the axial direction. Convex parts 31a, 31b are respectively provided on the outer peripheries of the respective magnetic poles of the rotor cores along the axial direction of the rotor. The convex parts 31a, 31b are provided to positions that are displaced for each of the two divided cores. The magnetic flux density increases in the convex parts, which becomes the magnetic pole center. Since the convex parts positions are displaced to each other, a skew function can be exhibited even if the permanent magnet is mounted at the same position.Type: ApplicationFiled: December 16, 2009Publication date: December 22, 2011Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Norio Takahashi, Kazuto Sakai, Yutaka Hashiba, Kazuaki Yuuki, Masanori Arata, Yusuke Matsuoka, Tadashi Tokumasu
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Publication number: 20110304235Abstract: According to one embodiment, a rotor is configured by a rotor core and magnetic poles. Two or more types of permanent magnets are used such that each product of coercivity and thickness in the magnetization direction becomes different. A stator is located outside the rotor with air gap therebetween and configured by an armature core winding. At least one permanent magnet is magnetized by a magnetic field by a current of the armature winding to change a magnetic flux content thereof irreversibly. A short circuited coil is provided to surround a magnetic path portion of the other permanent magnet excluding the magnet changed irreversibly and a portion adjacent to the other permanent magnet where the magnetic flux leaks. A short-circuit current is generated in the short circuited coil by the magnetic flux generated by conducting a magnetization current to the winding. A magnetic field is generated by the short-circuit current.Type: ApplicationFiled: December 15, 2009Publication date: December 15, 2011Applicant: Kabushiki Kaisha ToshibaInventors: Yutaka Hashiba, Kazuto Sakai, Norio Takahashi, Kazuaki Yuuki, Masanori Arata, Yusuke Matsuoka, Motoyasu Mochizuki, Tadashi Tokumasu
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Publication number: 20110175478Abstract: An increase of the magnetization current can be restrained during demagnetization and magnetization, and a variable speed operation can be achieved at a high power output over a wide range of from a low speed to a high speed. A rotor 1 is configured by a rotor core 2, permanent magnets 3 having a small value as the product of the coercivity and the thickness in the magnetization direction thereof, and permanent magnets 4 having a large value as the product. When reducing a flux linkage of the permanent magnets 3, a magnetic field directed to the reverse direction of the magnetization direction of the permanent magnets 3 due to a current of an armature coil is caused to act on them. When increasing a flux linkage of the permanent magnets 3, a magnetic field directed to the same direction as the magnetization direction of the permanent magnets 3 due to a current of an armature coil is caused to act on them.Type: ApplicationFiled: June 19, 2009Publication date: July 21, 2011Applicant: Kabushiki Kaisha ToshibaInventors: Kazuto Sakai, Yutaka Hashiba, Yosuke Otsubo, Yusuke Matsuoka, Norio Takahashi, Tadashi Tokumasu
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Patent number: 7854167Abstract: A diagnosis device for diagnosing loosening of a stator core of a rotary electrical machine. The diagnosis device has: excitation means for vibrating the stator core in the radial direction; vibration detection means for detecting the vibration of the stator core in the radial direction; means for frequency-analyzing an output signal of the vibration detection means that detects vibration generated in the stator core when the stator core is vibrated by the excitation means so as to extract a measurement natural vibration mode of the stator core in a circular ring natural vibration mode; means for estimating a circular ring natural vibration mode of the stator core from shape data of the stator core; and means for determining a clamping state of the stator core by comparing the measurement natural vibration mode and a determination criterion obtained based on the estimated natural vibration mode.Type: GrantFiled: May 16, 2008Date of Patent: December 21, 2010Assignee: Kabushiki Kaisha ToshibaInventors: Yutaka Hashiba, Norio Takahashi, Masayuki Ichimonji, Hitoshi Katayama, Takaharu Tani, Tatsuo Taniguchi, Masayuki Takahashi
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Publication number: 20100301697Abstract: A rotor for a rotating electrical machine suppresses demagnetization of permanent magnets without deteriorating motor characteristics, is low-cost, and is highly reliable. The rotor has a plurality of rotor cores (2) that are stacked together, a plurality of permanent magnets (6a, 6b) axially divided by the rotor cores (2) and circumferentially arranged on each of the rotor cores (2), to circumferentially form magnetic irregularities, and a rotor blank (14a) made of nonmagnetic material arranged between those of the rotor cores (2) that are adjacent to each other.Type: ApplicationFiled: November 25, 2008Publication date: December 2, 2010Applicants: Kabushiki Kaisha Toshiba, Toshiba Industrial Products Manufacturing Corp.Inventors: Norio Takahashi, Mikio Takabatake, Masanori Arata, Kazuto Sakai, Yutaka Hashiba, Wataru Ito, Tadashi Tokumasu, Masakatsu Matsubara
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Patent number: 7804216Abstract: For an electrical reluctance rotary machine, a stator has a winding as an armature, and a rotor has permanent magnet implanting slots provided in a rotor core at lateral sides magnetic poles configured to produce reluctance torque along directions of magnetic flux passing through the magnetic poles to produce reluctance torque, and permanent magnets inserted in the permanent magnet implanting slots so as to cancel magnetic flux of the armature intersecting that magnetic flux, to control a magnetic field leaking at ends of the magnetic poles, having circumferential magnetic unevenness. The electrical reluctance rotary machine is configured to meet a relationship, such that 1.6 ? P × W pm R ? 1.9 where Wpm [mm] is a width of permanent magnet, R [mm] is a radius of the rotor, and P is the number of poles.Type: GrantFiled: October 19, 2007Date of Patent: September 28, 2010Assignees: Kabushiki Kaisha Toshiba, Toshiba Industrial Products Manufacturing CorporationInventors: Norio Takahashi, Kazuto Sakai, Masanori Arata, Yutaka Hashiba, Wataru Ito, Motoyasu Mochizuki, Mikio Takabatake, Masakatsu Matsubara, Takashi Hanai
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Publication number: 20080282803Abstract: A diagnosis device for diagnosing loosening of a stator core of a rotary electrical machine. The diagnosis device has: excitation means for vibrating the stator core in the radial direction; vibration detection means for detecting the vibration of the stator core in the radial direction; means for frequency-analyzing an output signal of the vibration detection means that detects vibration generated in the stator core when the stator core is vibrated by the excitation means so as to extract a measurement natural vibration mode of the stator core in a circular ring natural vibration mode; means for estimating a circular ring natural vibration mode of the stator core from shape data of the stator core; and means for determining a clamping state of the stator core by comparing the measurement natural vibration mode and a determination criterion obtained based on the estimated natural vibration mode.Type: ApplicationFiled: May 16, 2008Publication date: November 20, 2008Applicant: Kabushiki Kaisha ToshibaInventors: Yutaka Hashiba, Norio Takahashi, Masayuki Ichimonji, Hitoshi Katayama, Takaharu Tani, Tatsuo Taniguchi, Masayuki Takahashi
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Publication number: 20080093944Abstract: For an electrical reluctance rotary machine, a stator has a winding as an armature, and a rotor has permanent magnet implanting slots provided in a rotor core at lateral sides magnetic poles configured to produce reluctance torque along directions of magnetic flux passing through the magnetic poles to produce reluctance torque, and permanent magnets inserted in the permanent magnet implanting slots so as to cancel magnetic flux of the armature intersecting that magnetic flux, to control a magnetic field leaking at ends of the magnetic poles, having circumferential magnetic concavo-convex. The electrical reluctance rotary machine is configured to meet a relationship, such that 1.6 ? P × W pm R ? 1.9 where Wpm [mm] is a width of permanent magnet, R [mm] is an outer-diametrical radius of the rotor, and P is the number of poles.Type: ApplicationFiled: October 19, 2007Publication date: April 24, 2008Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA INDUSTRIAL PRODUCTS MANUFACTURING CORP.Inventors: Norio TAKAHASHI, Kazuto Sakai, Masanori Arata, Yutaka Hashiba, Wataru Ito, Motoyasu Mochizuki, Mikio Takabatake, Masakatsu Matsubara, Takashi Hanai
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Publication number: 20080042363Abstract: Hydrogen gas is circulated to cool an electric rotating machine main body, and brush seals are provided to contact a predetermined position on the outer circumferential surface of a rotating shaft. As a result, contact of a sealing oil and the hydrogen gas, contact of a lubricating oil and the sealing oil in the bearing, and leakage of the hydrogen gas outside the machine are prevented.Type: ApplicationFiled: October 19, 2007Publication date: February 21, 2008Inventors: Yutaka HASHIBA, Makoto Mikami, Takeshi Hayashi, Yukihiko Kazao, Ikuo Saito, Hidekazu Shiomi, Yoshihiro Taniyama, Yasuo Kabata
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Patent number: 7291947Abstract: Hydrogen gas is circulated to cool an electric rotating machine main body, and brush seals are provided to contact a predetermined position on the outer circumferential surface of a rotating shaft. As a result, contact of a sealing oil and the hydrogen gas, contact of a lubricating oil and the sealing oil in the bearing, and leakage of the hydrogen gas outside the machine are prevented.Type: GrantFiled: May 13, 2005Date of Patent: November 6, 2007Assignee: Kabushiki Kaisha ToshibaInventors: Yutaka Hashiba, Makoto Mikami, Takeshi Hayashi, Yukihiko Kazao, Ikuo Saito, Hidekazu Shiomi, Yoshihiro Taniyama, Yasuo Kabata
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Publication number: 20060192343Abstract: A liquid-sealing shaft seal apparatus includes a rotation shaft, brush seals arranged in such a manner as to contact and surround the rotation shaft, and a brush holder which holds the brush seals, wherein more than one line of brush seals are arranged in the axial direction of the rotation shaft through a cavity, and the brush holder is provided with a liquid returning pass to return a liquid having leaked through the brush seals into the cavity to the side of an atmosphere in which a liquid is present as a sealing target.Type: ApplicationFiled: February 17, 2006Publication date: August 31, 2006Inventors: Yutaka Hashiba, Masayuki Ichimonji, Hitoshi Katayama, Hidekazu Shiomi, Yasuo Kabata
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Publication number: 20050206249Abstract: Hydrogen gas is circulated to cool an electric rotating machine main body, and brush seals are provided to contact a predetermined position on the outer circumferential surface of a rotating shaft. As a result, contact of a sealing oil and the hydrogen gas, contact of a lubricating oil and the sealing oil in the bearing, and leakage of the hydrogen gas outside the machine are prevented.Type: ApplicationFiled: May 13, 2005Publication date: September 22, 2005Inventors: Yutaka Hashiba, Makoto Mikami, Takeshi Hayashi, Yukihiko Kazao, Ikuo Saito, Hidekazu Shiomi, Yoshihiro Taniyama, Yasuo Kabata
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Patent number: 6794784Abstract: Permanent magnets are arranged to be supported by the provision of permanent magnet position-locating projections (12) in permanent magnet embedding holes (5). By optimizing the shape of thin-wall regions (18) and (19) within rotor core (4), leakage of flux generated from the permanent magnets is reduced and the strength of the thin-wall regions where stress is concentrated is ensured.Type: GrantFiled: May 24, 2001Date of Patent: September 21, 2004Assignees: Kabushiki Kaisha Toshiba, Toshiba Industrial Products Manufacturing CorporationInventors: Norio Takahashi, Yutaka Hashiba, Kazuto Sakai, Masanori Arata, Yukihiko Kazao, Takashi Araki, Masakatsu Matsubara, Yasuo Hirano
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Publication number: 20020047435Abstract: Permanent magnets are arranged to be supported by the provision of permanent magnet position-locating projections (12) in permanent magnet embedding holes (5). By optimizing the shape of thin-wall regions (18) and (19) within rotor core (4), leakage of flux generated from the permanent magnets is reduced and the strength of the thin-wall regions where stress is concentrated is ensured.Type: ApplicationFiled: May 24, 2001Publication date: April 25, 2002Inventors: Norio Takahashi, Yutaka Hashiba, Kazuto Sakai, Masanori Arata, Yukihiko Kazao, Takashi Araki, Masakatsu Matsubara, Yasuo Hirano
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Patent number: 6329734Abstract: A permanent magnet-reluctance type rotating machine includes an annular stator having armature windings arranged on an inner periphery of the stator, a rotor rotatably arranged inside the stator and a plurality of permanent magnets disposed in a rotor core. One permanent magnet defining each pole is divided into two magnet pieces in a direction parallel to the magnetizing direction of the permanent magnets. Owing to the division of the magnet, the mass of each permanent magnet becomes small in comparison with that of the conventional machine, so that the centrifugal force applied on the magnet holes can be reduced. Consequently, the stress generating in the rotor core is decreased to allow the rotating machine to rotate at a higher speed.Type: GrantFiled: February 22, 2000Date of Patent: December 11, 2001Assignee: Kabushiki Kaisha ToshibaInventors: Norio Takahashi, Kazuto Sakai, Yutaka Hashiba, Masanori Arata, Hirotsugu Tsutsui
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Patent number: 6268677Abstract: A rotor is provided for a permanent magnet type rotating machine having a stator 1 with armature windings 11. The rotor 3 includes a rotor core 31 and a plurality of permanent magnets 32 arranged in the rotor core 31 so as to negate magnetic flux of the armature windings 11 passing through interpoles 3b. The rotor 3 is constructed so that the average of magnetic flux in an air gap 2 between the rotor 3 and the stator 1, which is produced by the permanent magnets 32 at the armature windings' de-energized, ranges from 0.1 [T] to 0.7 [T] and the ratio (Lq/Ld) of self-inductance of the magnetic portion in a hard-magnetizing direction (q-axis) to self-inductance in an easy-magnetizing direction (d-axis) under a rated load condition ranges from 0.1 to 0.8. Under these conditions, it is possible to realize the rotating machine which operates as an induction machine at the machine's starting and also operates as an synchronous machine at the rated driving due to smooth pull-in.Type: GrantFiled: March 29, 2000Date of Patent: July 31, 2001Assignee: Kabushiki Kaisha ToshibaInventors: Mikio Takabatake, Masanori Arata, Kazuto Sakai, Yutaka Hashiba, Yoshio Hashidate, Norio Takahashi, Koji Oishi, Shiro Amemori
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Patent number: 6265801Abstract: A permanent magnet electrical rotating machine wherein the slots of stator core 2A of stator 1A are rectangular enclosed slots 4A in which triangular projecting gaps 3a are formed on the inner periphery side of this stator core 2A. The stator core 2A is cooled by passing gas through the projecting gaps 3a. The magnet flux that reaches stator core 2A from permanent magnets 6 by passing through retaining ring 8 and air gap 9 is caused to pass the inner periphery sides of the projecting gaps a of the stator core 2A. By this means, oscillation of magnetic flux density in the peripheral direction is prevented, eddy currents in the retaining ring 8 which accompany this oscillation are reduced and temperature rise prevented.Type: GrantFiled: January 22, 1999Date of Patent: July 24, 2001Assignee: Kabushiki Kaisha ToshibaInventors: Yutaka Hashiba, Tadashi Tokumasu, Kazuto Sakai, Norio Takahashi