Patents Assigned to Mabuchi Motor Co. Ltd.
  • Patent number: 10348175
    Abstract: Provided are a rotor, a manufacturing method of the rotor, and a DC motor including the rotor, the rotor including: a core around which a winding is wound, the core being rotatable integrally with a shaft; a commutator being fixed to the shaft and having a terminal to be connected to one end of the winding; and a conduction plate being externally fitted onto the shaft via an insulator part between the terminal of the commutator and the core, the conduction plate having a connection part to be connected to the other end of the winding, wherein an axial direction position of the connection part is set in an intermediate portion that is between a winding projection of the winding and the terminal.
    Type: Grant
    Filed: December 20, 2016
    Date of Patent: July 9, 2019
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventors: Kazuki Fukuhara, Kouichi Hashimoto
  • Patent number: 10284037
    Abstract: A rotor core includes: an annular part around a through hole; a plurality of fan-shaped magnetic pole pieces radially formed around the annular part; and a plurality of magnet holders radially formed between adjacent magnetic pole pieces, and a plurality of first magnetic flux blocking parts formed in respective areas between adjacent magnet holders. The magnet holder includes a second magnetic flux blocking part at an end of the magnetic holder toward the rotating shaft. The rotor core includes two magnetic paths formed between the first magnetic flux blocking part and the two second magnetic flux blocking parts adjacent to the first magnetic flux blocking part. The two magnetic paths branch in different directions toward the annular part from the end of the magnetic pole piece toward the rotating shaft.
    Type: Grant
    Filed: April 28, 2015
    Date of Patent: May 7, 2019
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventor: Yusuke Miyajima
  • Publication number: 20190044417
    Abstract: An annular sensor magnet to be fixed to a motor shaft by a press-fit includes an annular portion having magnetic poles alternately formed in an outer peripheral portion. The annular sensor magnet also includes a fixing portion extending from an inner peripheral portion of the annular portion toward a center to support and fix the motor shaft having been press-fit, and a stress reducing portion for reducing stress caused in a contact portion of the fixing portion that contacts the motor shaft when the motor shaft is press-fit onto the fixing portion. The sensor magnet includes a bonded magnet in which a magnetic material is dispersed in a plastic material.
    Type: Application
    Filed: July 18, 2018
    Publication date: February 7, 2019
    Applicant: MABUCHI MOTOR CO., LTD.
    Inventors: Kazuyuki YAMAMOTO, Satoshi KIKUCHI
  • Patent number: 10177613
    Abstract: A rotor includes a circular rotor core, a plurality of ? magnets, and ring-shaped Z magnets. The rotor core has a plurality of magnet holding sections formed radially with a rotating shaft as the center. The ? magnets are contained in and held by the magnet holding sections such that the same magnetic poles of adjacent magnets face each other in a circumferential direction of the rotor core. The rotor core is such that N-poles and S-poles are alternately formed in a circumferential direction of an outer circumferential surface of the rotor core. The Z magnets are such that N-poles and S-poles are alternately formed circularly on an opposed face of the auxiliary magnet facing an end face of the rotor core in a direction of the rotating shaft.
    Type: Grant
    Filed: January 29, 2014
    Date of Patent: January 8, 2019
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventor: Tadayuki Wakita
  • Patent number: 10177632
    Abstract: A brushless motor includes: a columnar rotor including magnets; a stator including at its center a space for placing the rotor; a housing member that houses the rotor and the stator; and a detector that detects a signal dependent on a rotational position of the rotor based on variation in a magnetic field associated with a rotation of the rotor. The housing member includes a front bell that supports a portion of the rotating shaft of the rotor and a housing body that supports another portion of the rotating shaft of the rotor. The front bell includes a mount fitted with the detector. The mount projects from the base toward an end face of the rotor.
    Type: Grant
    Filed: April 10, 2015
    Date of Patent: January 8, 2019
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventor: Yusuke Miyajima
  • Publication number: 20180358862
    Abstract: Provided is a brushed motor in which noise in a high rotational speed range is effectively decreased. A bar-shaped flat attachment 28 of synthetic resin is inserted along an axial line L into an opening of a slot 16 formed in a core 14 of a rotor 7, and fixed with respect to the core 14 and/or windings 17 using adhesive agent. The flat attachment 28 has side surfaces 28b and an inner peripheral surface 28c. The side surfaces 28b are engaged from an inner peripheral side with inclined surfaces 15a of teeth 15 adjacent to each other across the opening of the slot 16. The inner peripheral surface 28c of the flat attachment 28 has two ridges 28d protruding therefrom which are abutted against the windings 17. The flat attachment 28 closes the opening of the slot 16 and shapes an outer peripheral surface 14a of the core 14 into a flat cross sectional shape suitable for suppression of wind noise.
    Type: Application
    Filed: May 23, 2018
    Publication date: December 13, 2018
    Applicant: MABUCHI MOTOR CO., LTD.
    Inventors: Yasuhiro HASHIMOTO, Hideyuki UZAWA, Yasuhiro YAMAGATA
  • Patent number: 10090728
    Abstract: A gearbox includes: a gearbox main body made of resin that constitutes a part of a speed reducer to which a motor is mounted; and a terminal that conducts power supplied from an external source to the motor. The gearbox main body includes a through hole formed to correspond to a mold that is used to maintain a position of the terminal while the terminal is being integrated with the gearbox main body by insert molding. The through hole may function as a vent hole in the gearbox main body.
    Type: Grant
    Filed: November 18, 2016
    Date of Patent: October 2, 2018
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventors: Takao Mitsumizo, Yuuki Hirano, Toshiya Yuhi, Hiroki Kouno, Satoshi Kikuchi
  • Patent number: 10020701
    Abstract: A rotor includes: a rotor core; a plurality of magnets; and an adhesive that adhesively bonds the magnet to the rotor core. The magnets are housed in the magnet holders such that the same magnetic poles of adjacent magnets face each other in a circumferential direction of the rotor core. The adhesive includes: a first adhesive part that adhesively bonds two interior surfaces of the magnet holder facing the circumferential direction to the magnet and that reaches one of ends of the magnet in a direction of axis of the magnet; and a second adhesive part that adhesively bonds, on a side of one of end surfaces of the rotor core in a direction of axis of the rotor core, said end surface of the rotor core to an end surface of the magnet in an axial direction of the magnet and that is connected to the first adhesive part.
    Type: Grant
    Filed: April 28, 2015
    Date of Patent: July 10, 2018
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventors: Toshihiro Kamiyoshihara, Shinya Ishihara
  • Publication number: 20180183199
    Abstract: The present invention provides a method for linking a flexible member that is displaced in a predetermined direction and a fixed member linked with the flexible member. The method includes a flexible member supporting step of sandwiching and supporting the flexible member by a first section of a plate-like link member fixed and held to the fixed member and a second section of the link member opposing the first section; and a joining step of joining at least one of the first section and the second section with the flexible member in a contact area in which the first and the second sections contact the flexible member, at a position spaced apart by a predetermined distance from a vibration transmitted end portion to which vibrations of the flexible member are transmitted.
    Type: Application
    Filed: November 9, 2017
    Publication date: June 28, 2018
    Applicant: MABUCHI MOTOR CO., LTD.
    Inventor: Kenji OHI
  • Publication number: 20180183363
    Abstract: A control device for controlling a motor is provided with: a first reception unit receiving a target value of a rotational speed of the motor; a second reception unit receiving speed information concerning the rotational speed of the motor; a control amount signal output unit determining the control amount based on the speed information and a target value and outputting the control amount signal; and a switch signal output unit outputting, based on the control amount for causing a decrease in the rotational speed due to the brake and indicated by the speed information to reach the target value, a switch signal for switching a torque generation direction of the motor.
    Type: Application
    Filed: November 9, 2017
    Publication date: June 28, 2018
    Applicant: MABUCHI MOTOR CO., LTD.
    Inventor: Kentaro SAKAMOTO
  • Publication number: 20180138773
    Abstract: A rotor having a core with a novel configuration, where the rotor is provided with a first component having a plurality of teeth radially disposed about a rotating axis, a coil wound on the plurality of teeth, and a tubular second component fixed to the first component so as to connect distal ends of the plurality of teeth. The first component and the second component constitute a core. The second component has a multilayer structure of a plurality of laminated steel sheets.
    Type: Application
    Filed: October 26, 2017
    Publication date: May 17, 2018
    Applicant: MABUCHI MOTOR CO., LTD.
    Inventor: Yasuhiro YAMAGATA
  • Publication number: 20180062476
    Abstract: A motor addresses the problem of a decrease in usability due to the use of a complex structure on a counterpart mechanism on which the motor is mounted, the complex structure being used to prevent rotation of the motor on the counterpart mechanism while centering the motor shaft. The motor includes: a rotor with a shaft; a housing covering an outer periphery of the rotor; and an end plate covering an end portion of the housing in an axial direction of the rotor. The end plate includes a protruding portion for enabling external contact protruding in a direction in which the shaft extends. The protruding portion has an outer peripheral surface having a non-circular shape in a cross section perpendicular to the direction in which the shaft extends, and has an opening through a face thereof opposing the shaft.
    Type: Application
    Filed: August 24, 2017
    Publication date: March 1, 2018
    Applicant: MABUCHI MOTOR CO., LTD.
    Inventors: Satoshi IZUKA, Satoshi SHIMIZU
  • Publication number: 20180026499
    Abstract: The present invention is a structure of an electrical connection portion formed by thermal bonding of a terminal 53 of a current-carrying component 50 of a motor and a winding wire 30. The terminal 53 includes a lock portion 53a positioned on a base end side and a fusion portion 53b positioned on a distal end side. The winding wire 30 includes a binding portion 31 wound around the lock portion 53a and has a one end portion 36 coupled to a molten ball 55 generated at the fusion portion 53b; and a coupling wire portion 33 tightly stretched from a main winding wire portion 34 of the motor disposed in a wound state and continuous to the other end portion of the binding portion 31. The one end portion 36 of the binding portion 31 is in a state where tension pulling the coupling wire portion 33 to the main winding wire portion 34 side does not act.
    Type: Application
    Filed: September 13, 2017
    Publication date: January 25, 2018
    Applicant: MABUCHI MOTOR CO., LTD.
    Inventors: Shou NAKAYAMA, Yoshiaki MAEDA, Takeshi HIRANO, Kenji MUNEDA, Keishirou MAKI
  • Patent number: 9843235
    Abstract: A motor includes a brush holder fitted into an opening portion of a cylindrical housing in which a rotor is housed, and a terminal fixed to the brush holder. The brush holder includes a holder section inserted into the opening portion of the housing, a connector section that is provided in a position protruding from an outer edge portion of the holder section in a radial direction and that is connected to an external terminal, and a linking section that links the holder section and the connector section. The terminal is fixed to the linking section.
    Type: Grant
    Filed: April 26, 2016
    Date of Patent: December 12, 2017
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventors: Tarou Yoshida, Shunsuke Mashio, Akira Ishidaira
  • Patent number: 9806582
    Abstract: A motor includes: an end bell mounted on an opening of a cylindrical rotor housing for housing a rotor and is provided with a power-feeding path to the rotor; and a choke coil connected in the middle of the power-feeding path. The choke coil overlaps at least a part of the rotor housing as viewed from outside the rotor housing in a radial direction and as viewed in a direction perpendicular to an axial direction, and is arranged such that a longitudinal direction thereof extends along a direction parallel to a rotating shaft of the motor.
    Type: Grant
    Filed: February 1, 2016
    Date of Patent: October 31, 2017
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventor: Atsushi Yoshida
  • Patent number: 9755486
    Abstract: A motor includes a cylindrical rotor housing that contains a rotor, a brush holder mounted to an opening of the rotor housing, an end plate, having an electrically conductive part, which holds the brush holder in between the end plate and the rotor housing, and a grounding mechanism that realizes a ground connection to both a part of wiring led to a brush, provided in the brush holder, and the end plate. The grounding mechanism is provided in a region where the brush holder faces the end plate.
    Type: Grant
    Filed: March 18, 2016
    Date of Patent: September 5, 2017
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventors: Hidekazu Saitou, Yoshinobu Katsuta
  • Patent number: 9742323
    Abstract: A phase control circuit for a brushless motor includes a signal output unit that outputs M signals, whose phases differ from each other, in response to a change in the magnetic field resulting from the rotation of magnets placed in a rotor, and a control signal generator that generates two or more different kinds of group of phase control signals, based on at least the M signals, the group of phase control signals being used to control drive voltages, whose phases differ from each other, which are supplied to each phase of an N-phase coil (N being an integer greater than or equal to two). The control signal generator is configured such that a first phase control signal group and a second phase control signal group can be generated.
    Type: Grant
    Filed: January 12, 2016
    Date of Patent: August 22, 2017
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventor: Naoto Miyauchi
  • Patent number: 9698636
    Abstract: A brushless motor includes: a rotor including a magnet; and a stator including at its center a space for placing the rotor. The rotor includes: a rotor core; and a plurality of magnets. The rotor core includes a plurality of magnet holders radially formed around a rotating shaft. The magnets are housed in the magnet holders such that the same magnetic poles of adjacent magnets face each other in a circumferential direction of the rotor core, and the stator includes a plurality of teeth formed toward the center to face the rotor. Given that a radius of curvature of an outer circumference of the rotor core is R, a width of an end of the teeth in a circumferential direction is W, and a maximum outer diameter of the rotor core is L, 0.9?R/W?4.2 and R<L/2 are met.
    Type: Grant
    Filed: April 28, 2015
    Date of Patent: July 4, 2017
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventor: Yuuichirou Matsuoka
  • Publication number: 20170187273
    Abstract: Provided are a rotor, a manufacturing method of the rotor, and a DC motor including the rotor, the rotor including: a core around which a winding is wound, the core being rotatable integrally with a shaft; a commutator being fixed to the shaft and having a terminal to be connected to one end of the winding; and a conduction plate being externally fitted onto the shaft via an insulator part between the terminal of the commutator and the core, the conduction plate having a connection part to be connected to the other end of the winding, wherein an axial direction position of the connection part is set in an intermediate portion that is between a winding projection of the winding and the terminal.
    Type: Application
    Filed: December 20, 2016
    Publication date: June 29, 2017
    Applicant: MABUCHI MOTOR CO., LTD.
    Inventors: Kazuki FUKUHARA, Kouichi HASHIMOTO
  • Patent number: 9618082
    Abstract: A worm gear includes a worm formed with a through hole through which a shaft transmitting the rotation of a motor is inserted, and a worm wheel configured to mesh with the worm and transmit the rotation to an output shaft. Given that a normal pitch is denoted by E and a width of a recess in the direction of a worm axis by H, the worm is configured such that H/E?0.6 (1) is met.
    Type: Grant
    Filed: February 19, 2014
    Date of Patent: April 11, 2017
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventors: Kiyoto Itou, Kazuyuki Yamamoto