Patents by Inventor Motomichi Ohto

Motomichi Ohto 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).

  • Publication number: 20200382036
    Abstract: A motor control system includes a motor and a motor control circuitry. The motor includes a rotation axis and a bearing rotatably supporting the rotation axis. The motor control circuitry is configured to control the motor. The motor control circuitry includes a driving time adding circuit configured to add up a driving time of the motor to obtain an accumulated driving time of the motor, a remaining lifetime calculation circuit configured to calculate a remaining lifetime of the bearing based on a lifetime of the bearing and the accumulated driving time, and a warning outputting circuit configured to output warning information when the remaining lifetime is equal to or less than a threshold.
    Type: Application
    Filed: August 20, 2020
    Publication date: December 3, 2020
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Misaki SHIIYA, Masahiro TOUCHI, Motomichi OHTO, Sadayuki SATO, Hideaki IKE, Jiro MURAOKA
  • Patent number: 10855120
    Abstract: A rotating electrical machine includes a frame, and a stator core fixed to an inner peripheral surface of the frame and including a plurality of split cores disposed in a peripheral direction. Each of the plurality of split cores includes a groove disposed along an axial direction on a central position in the peripheral direction on an outer peripheral surface of the split core, and a first protrusion disposed on a bottom of the groove and protruding outward in a radial direction.
    Type: Grant
    Filed: August 2, 2018
    Date of Patent: December 1, 2020
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Takeo Suzuki, Kenichi Hirata, Hiroshi Koga, Motomichi Ohto, Yosuke Shirozu
  • Patent number: 10855123
    Abstract: A rotating electrical machine includes a plurality of core pieces forming a stator core. Each of the core pieces includes contact surfaces on one side end and another side end in a peripheral direction, a tapered protrusion on the contact surface of the one side end, the protrusion including first inclined surfaces outside and inside, and a recess on the contact surface of the other side end, the recess including second inclined surfaces contacting the first inclined surfaces outside and inside to receive the protrusion of adjacent core piece. A cross-sectional shape of the protrusion is a shape such that, inside a circle centered on a first end portion with a distance being a radius between a second end portion located on an opposite side of the first end portion and the first end portion, at least a part of the first inclined surfaces contact the second inclined surfaces.
    Type: Grant
    Filed: September 14, 2018
    Date of Patent: December 1, 2020
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Takeo Suzuki, Motomichi Ohto, Kenichi Hirata, Hiroki Takamura, Yosuke Shirozu, Yuta Matsunami
  • Publication number: 20190013706
    Abstract: A rotating electrical machine includes a plurality of core pieces forming a stator core. Each of the core pieces includes contact surfaces on one side end and another side end in a peripheral direction, a tapered protrusion on the contact surface of the one side end, the protrusion including first inclined surfaces outside and inside, and a recess on the contact surface of the other side end, the recess including second inclined surfaces contacting the first inclined surfaces outside and inside to receive the protrusion of adjacent core piece. A cross-sectional shape of the protrusion is a shape such that, inside a circle centered on a first end portion with a distance being a radius between a second end portion located on an opposite side of the first end portion and the first end portion, at least a part of the first inclined surfaces contact the second inclined surfaces.
    Type: Application
    Filed: September 14, 2018
    Publication date: January 10, 2019
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Takeo SUZUKI, Motomichi OHTO, Kenichi HIRATA, Hiroki TAKAMURA, Yosuke SHIROZU, Yuta MATSUNAMI
  • Publication number: 20180342913
    Abstract: A rotating electrical machine includes a frame, and a stator core fixed to an inner peripheral surface of the frame and including a plurality of split cores disposed in a peripheral direction. Each of the plurality of split cores includes a groove disposed along an axial direction on a central position in the peripheral direction on an outer peripheral surface of the split core, and a first protrusion disposed on a bottom of the groove and protruding outward in a radial direction.
    Type: Application
    Filed: August 2, 2018
    Publication date: November 29, 2018
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Takeo SUZUKI, Kenichi HIRATA, Hiroshi KOGA, Motomichi OHTO, Yosuke SHIROZU
  • Patent number: 9564780
    Abstract: A rotary electric machine is provided, which includes a rotor core, a plurality of permanent magnets embedded in the rotor core, and a stator core arranged so as to oppose to the rotor core. The plurality of permanent magnets include a pair of first permanent magnets. The pair of first permanent magnets are arranged so that first magnetic poles thereof having the same polarity oppose to each other and are separated from each other on both sides of a magnetic path of d-axis by a predetermined distance. The rotor core includes gaps formed within the magnetic path of the d-axis.
    Type: Grant
    Filed: February 27, 2015
    Date of Patent: February 7, 2017
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Yukio Tsutsui, Atsushi Kawahara, Motomichi Ohto
  • Publication number: 20160134217
    Abstract: A motor includes a stator and a rotor that is arranged opposite to the stator through a predetermined air gap. The stator is such that a plurality of coils are wound around respective slots for each of a plurality of phases. In the stator, the number of turns of one of the plurality of coils is different from those of the others for each of the phases. In the rotor, among a plurality of magnetic poles formed of a plurality of permanent magnets arranged in a circumferential direction of a core, a magnetoresistance of at least one magnetic pole is different from those of the others.
    Type: Application
    Filed: January 20, 2016
    Publication date: May 12, 2016
    Applicants: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Shinya MORIMOTO, Sohji MURAKAMI, Noor Aamir BALOCH, Motomichi OHTO, Yong-Cheol KWON, Seung-Ki SUL
  • Publication number: 20160087516
    Abstract: A linear-rotary actuator includes a rotor and a stator. The rotor includes an output shaft, and makes a linear motion in an axial direction and a rotary motion in a circumferential direction. The rotor includes N and S pole portions alternating with each other in the axial direction as seen in the circumferential direction and alternating with each other in the circumferential direction as seen in the axial direction. The stator includes a linear motion winding, a rotary motion winding, and protruding cores. The protruding cores protrude toward an inner circumferential side of a radial direction to be opposed to the rotor. The protruding cores are arranged in the axial direction and in the circumferential direction, and displaced in the axial direction to form a circumferential line skewed relative to a direction in which the rotor makes the rotary motion.
    Type: Application
    Filed: September 17, 2015
    Publication date: March 24, 2016
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Shogo MAKINO, Motomichi OHTO
  • Publication number: 20160087515
    Abstract: A linear-rotary actuator includes a rotor and a stator. The rotor includes an output shaft, and makes a linear motion in an axial direction of the output shaft and a rotary motion in a circumferential direction of the output shaft. The rotor includes permanent magnets and yokes alternating with each other in the axial direction. Each yoke includes protrusions that protrude toward an outer circumferential side of a radial direction of the output shaft and that are arranged in the circumferential direction. Each protrusion includes overhangs respectively extending toward first and second sides of the axial direction to overlap the permanent magnets in the radial direction. The stator includes a linear motion winding to generate a first magnetic field to cause the rotor to make the linear motion, and a rotary motion winding to generate a second magnetic field to cause the rotor to make the rotary motion.
    Type: Application
    Filed: September 17, 2015
    Publication date: March 24, 2016
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Shogo MAKINO, Motomichi OHTO
  • Patent number: 9270156
    Abstract: A linear motor includes a stator and an armature that faces the stator with a gap therebetween. The stator has an elongated shape extending so as to cross a direction in which the stator faces the armature, and includes a plurality of salient poles that are arranged along a longitudinal direction of the stator and protrude toward the armature. The armature includes an armature core including a tooth that protrudes toward the stator, an armature winding wound around the tooth, a plurality of permanent magnets disposed on an end side of the tooth so as to be arranged along the longitudinal direction of the stator, and a magnetic-field sensor that detects a magnetic field which is generated by the plurality of permanent magnets and which passes through the plurality of salient poles.
    Type: Grant
    Filed: June 23, 2014
    Date of Patent: February 23, 2016
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Shogo Makino, Motomichi Ohto, Yuji Arinaga
  • Publication number: 20150171678
    Abstract: A rotary electric machine is provided, which includes a rotor core, a plurality of permanent magnets embedded in the rotor core, and a stator core arranged so as to oppose to the rotor core. The plurality of permanent magnets include a pair of first permanent magnets. The pair of first permanent magnets are arranged so that first magnetic poles thereof having the same polarity oppose to each other and are separated from each other on both sides of a magnetic path of d-axis by a predetermined distance. The rotor core includes gaps formed within the magnetic path of the d-axis.
    Type: Application
    Filed: February 27, 2015
    Publication date: June 18, 2015
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Yukio TSUTSUI, Atsushi KAWAHARA, Motomichi OHTO
  • Patent number: 9024498
    Abstract: A rotating electrical machine includes a rotor core, a stator core, and at least one permanent magnet. The rotor core has an inner circumference portion and an outer circumference portion. The stator core is opposed to the outer circumference portion of the rotor core. The at least one permanent magnet radially extends inside the rotor core. The at least one permanent magnet has an incremental circumferential width in a direction from the inner circumference portion to the outer circumference portion of the rotor core.
    Type: Grant
    Filed: November 8, 2011
    Date of Patent: May 5, 2015
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Sohji Murakami, Haruki Yahara, Mitsunori Kamo, Motomichi Ohto
  • Patent number: 8987950
    Abstract: An actuator in accordance with an embodiment includes at least one linear motor, a partition member and a fan. The linear motor is configured to linearly move a shaft serving as a movable member. The partition member is provided close to the shaft and configured to partition a space defined between the shaft and a control board for controlling the linear motor. Further, the fan is arranged on the side of the shaft with respect to the partition member and configured to flow an air existing in a partitioned space on the side of the shaft.
    Type: Grant
    Filed: October 18, 2012
    Date of Patent: March 24, 2015
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Shogo Makino, Takeo Suzuki, Yukio Tsutsui, Motomichi Ohto
  • Publication number: 20150028697
    Abstract: A linear motor includes a stator and an armature that faces the stator with a gap therebetween. The stator has an elongated shape extending so as to cross a direction in which the stator faces the armature, and includes a plurality of salient poles that are arranged along a longitudinal direction of the stator and protrude toward the armature. The armature includes an armature core including a tooth that protrudes toward the stator, an armature winding wound around the tooth, a plurality of permanent magnets disposed on an end side of the tooth so as to be arranged along the longitudinal direction of the stator, and a magnetic-field sensor that detects a magnetic field which is generated by the plurality of permanent magnets and which passes through the plurality of salient poles.
    Type: Application
    Filed: June 23, 2014
    Publication date: January 29, 2015
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Shogo MAKINO, Motomichi OHTO, Yuji ARINAGA
  • Publication number: 20140246940
    Abstract: A motor includes a rotor including a rotor core provided with a plurality of permanent magnets in the circumferential direction and a stator including a stator core on which multi-phase stator coils are wound. The rotor has a structure in which the change pattern of magnetic properties of the rotor core or the permanent magnets changes in the circumferential direction, and the stator has a structure in which first and second stator coils of the stator coils are wound on the stator core for each phase in such a manner that passage of current is optionally switched, and when the passage of current is switched to the second stator coil, the distribution pattern of a magnetic field formed on the inner circumferential side by the stator has uniqueness over the whole circumference.
    Type: Application
    Filed: May 12, 2014
    Publication date: September 4, 2014
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Sohji MURAKAMI, Motomichi OHTO, Kentaro INOMATA, Shinya MORIMOTO, Kozo IDE
  • Publication number: 20140246939
    Abstract: The motor includes: a rotor that includes a rotor core provided with a plurality of permanent magnets in a circumferential direction; and a stator that includes a stator core on which multi-phase stator coils are wound and is arranged facing the rotor with a predetermined air gap therebetween. The rotor has a structure in which the change pattern of magnetic properties of the rotor core or the permanent magnets changes stepwise in the circumferential direction. The stator has a structure in which the distribution pattern of a magnetic field generated by the stator coils with one phase or with a combination of the phases has uniqueness over a whole circumference.
    Type: Application
    Filed: May 13, 2014
    Publication date: September 4, 2014
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Sohji MURAKAMI, Motomichi OHTO, Kentaro INOMATA, Kozo IDE, Shinya MORIMOTO
  • Patent number: 8502423
    Abstract: A linear motor includes a field including main-magnetic-pole permanent magnets magnetized in a direction of a generation magnetic field, and sub-magnetic-pole permanent magnets magnetized in a direction different from the direction of magnetic poles of the main-magnetic-pole permanent magnets, portions of the main-magnetic-pole permanent magnets located at a magnetic-field generation side being replaced with soft magnetic materials; and an armature including an armature core having teeth and armature coils wound around the armature cores. The linear motor satisfies ?<?, where ? is a pitch of the magnetic poles of the field, and ? is a pitch of the teeth.
    Type: Grant
    Filed: August 23, 2011
    Date of Patent: August 6, 2013
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Toru Shikayama, Masanobu Kakihara, Motomichi Ohto
  • Patent number: 8432080
    Abstract: This invention provides a rotating electrical machine including a rotor that has an even number of first permanent magnets aligned in a circumferential direction of the rotor, second permanent magnets of a number equal to that of the first permanent magnets, provided respectively between the stator and circumferential ends of the first permanent magnets adjacent to each other in the circumferential direction, and core pieces of a number equal to that of the first permanent magnets, provided respectively between the second permanent magnets adjacent to each other in the circumferential direction.
    Type: Grant
    Filed: August 10, 2010
    Date of Patent: April 30, 2013
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Souji Murakami, Motomichi Ohto, Haruki Yahara, Shinichi Nishi
  • Publication number: 20120200189
    Abstract: A rotating electrical machine includes a rotor core, a stator core, and at least one permanent magnet. The rotor core has an inner circumference portion and an outer circumference portion. The stator core is opposed to the outer circumference portion of the rotor core. The at least one permanent magnet radially extends inside the rotor core. The at least one permanent magnet has an incremental circumferential width in a direction from the inner circumference portion to the outer circumference portion of the rotor core.
    Type: Application
    Filed: November 8, 2011
    Publication date: August 9, 2012
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Sohji MURAKAMI, Haruki Yahara, Mitsunori Kamo, Motomichi Ohto
  • Publication number: 20120161551
    Abstract: A reluctance motor according to an aspect of an embodiment includes a stator and a mover. One of the stator and the mover includes a plurality of magnetic poles on which coils are wound. The other of the stator and the mover includes a magnetic segment that includes a directivity member of which the magnetization direction is regulated in a predetermined direction and that is embedded into a non-magnetic holder.
    Type: Application
    Filed: December 6, 2011
    Publication date: June 28, 2012
    Applicants: Nagasaki University, Kabushiki Kaisha Yaskawa Denki
    Inventors: Yasuhiro MIYAMOTO, Motomichi Ohto, Tsuyoshi Higuchi