Patents Assigned to Mabuchi Motor Co. Ltd.
  • Patent number: 10895284
    Abstract: A bearing unit includes: an impregnated bearing that rotatably supports a shaft of a rotor; a storage part which is formed in a manner that an end surface of a housing incorporating the rotor in an axial direction becomes convex toward an outer side and which stores the impregnated bearing in a non-rotatable manner; and an oil return washer which is placed to face an end surface of the impregnated bearing stored in the storage part and which integrally rotates with the shaft. The storage part has a bottom tubular shape, and includes an inner surface and a bottom surface, and the oil return washer is placed in a manner that the facing surface overlaps with the inner surface of the storage part when viewed from a radial direction, and includes a circulation part that receives oil leaked from the impregnated bearing and returns the oil to the impregnated bearing.
    Type: Grant
    Filed: September 27, 2019
    Date of Patent: January 19, 2021
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventors: Shinya Iio, Yoshinobu Katsuta, Satoshi Shimuzu
  • Patent number: 10895314
    Abstract: A gear box includes a gear box body, and a terminal which is integrated with the gear box body. The gear box body includes a storage portion which stores a gear, a motor insertion portion, recessed in an attachment surface of a motor, and a connector connection portion on the same side as the motor insertion portion with respect to a rotation center of the gear and is open in a direction different from the motor insertion portion. The terminal includes the connector terminal which is exposed to the inside of the connector connection portion, a motor feeding portion which is exposed to the inside of the motor insertion portion, a connecting portion which is in the gear box body and connects the connector terminal and the motor feeding portion, and a fixing tab extending from the connecting portion and exposed to the inside of the motor insertion portion.
    Type: Grant
    Filed: February 19, 2019
    Date of Patent: January 19, 2021
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventor: Makoto Takeda
  • Publication number: 20200295621
    Abstract: A motor includes a case; and a partition that is fitted into the case and has an easily deformable part formed on an outer peripheral surface for dispersing and dissipating vibration transmitted between the case and the partition. A space is formed in the easily deformable part.
    Type: Application
    Filed: March 5, 2020
    Publication date: September 17, 2020
    Applicant: MABUCHI MOTOR CO., LTD.
    Inventors: Kunihiro KUWANO, Takashi MURAMOTO
  • Publication number: 20200287484
    Abstract: A waveform control unit outputs a signal for driving a brushless DC motor by intermediate value energization to a waveform output unit, and outputs a signal for driving a brushless DC motor by sine wave energization to the waveform output unit when the signal in which the rotation position of the rotation reference is detected is acquired from the element, and the waveform control unit applies voltage corresponding to a sine value of an angle of a winding of one phase of n-phase windings when the brushless DC motor is to be driven by intermediate value energization, and outputs a signal for applying voltage corresponding to a sine value of an angle having similar phase difference as the sine wave energization drive with respect to the angle to the rest of the windings.
    Type: Application
    Filed: March 2, 2020
    Publication date: September 10, 2020
    Applicant: MABUCHI MOTOR CO., LTD.
    Inventor: Shunpei FUJII
  • Patent number: 10753772
    Abstract: A resolver includes a resolver rotor fixed to a rotating shaft, and a resolver stator disposed around the resolver rotor. The resolver stator includes an annular stator core having a plurality of salient poles which protrudes radially inward and which is disposed at regular intervals in a circumferential direction. The resolver rotor has an outer peripheral surface defined by an outer radius Rm(?) which is obtained by blending, with respect to a first function Gp(?) where an air gap between the resolver rotor and the salient poles is proportional to a sine wave (sin ?) related to an angle ? of the resolver rotor, a second function Gip(?) where the inverse of the air gap is proportional to the sine wave (sin ?), at a predetermined ratio ?.
    Type: Grant
    Filed: June 1, 2018
    Date of Patent: August 25, 2020
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventor: Shigeru Yamamoto
  • Patent number: 10731398
    Abstract: A reverse rotation prevention mechanism is provided on a torque transmission path between an output shaft and a driving shaft of a motor. The reverse rotation prevention mechanism includes: a first frictional force generation unit configured to inhibit a lock plate provided on the torque transmission path from rotating relative to another member when an external force is exerted on the output shaft; and a second frictional force generation unit configured to generate a braking force that prevents reverse rotation when an external force is exerted on the output shaft by causing a portion of the lock plate to be pressed. The first frictional force generation unit is provided in an area different from the second frictional force generation unit.
    Type: Grant
    Filed: August 22, 2017
    Date of Patent: August 4, 2020
    Assignee: Mabuchi Motor Co., Ltd.
    Inventors: Ryoichi Sugita, Toru Imai
  • Patent number: 10727766
    Abstract: A rotation speed calculation device of a brushless motor includes: a current acquisition unit that acquires magnitude of current flowing through a coil of the brushless motor; a supply voltage acquisition unit that acquires supply voltage supplied to the brushless motor; and a calculation unit that calculates rotation speed of the brushless motor based on the magnitude of the current acquired by the current acquisition unit, the supply voltage acquired by the supply voltage acquisition unit, and a voltage equation calculating the rotation speed based on the magnitude of the current and the supply voltage. The voltage equation is an equation in which a member expressing a voltage drop due to inductance of a winding of the coil of the brushless motor is expressed by a product of a factor proportional to the current and a factor proportional to the rotation speed of the brushless motor.
    Type: Grant
    Filed: October 2, 2018
    Date of Patent: July 28, 2020
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventor: Shumpei Fujii
  • Patent number: 10707729
    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: Grant
    Filed: September 13, 2017
    Date of Patent: July 7, 2020
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventors: Shou Nakayama, Yoshiaki Maeda, Takeshi Hirano, Kenji Muneda, Keishirou Maki
  • Patent number: 10642245
    Abstract: A motor control device includes: a rotational position calculator that calculates a rotational position of a motor that rotates a rotor; an operation state controller that controls a state of supply of operation power to the rotational position calculator; a deviation calculator that calculates a deviation of a rotational position of the rotor on the basis of a stop target rotational position of the rotor and the rotational position of the rotor after supply of a drive current to a coil is stopped and before supply of operation power to the rotational position calculator is stopped; a storage controller that stores the deviation on a storage; a rotational position control signal generator that generates a rotational position control signal for controlling the rotational position of the rotor on the basis of the deviation stored on the storage and the stop target rotational position of the rotor; and a drive current output unit that outputs the drive current to the coil on the basis of the rotational position
    Type: Grant
    Filed: September 26, 2018
    Date of Patent: May 5, 2020
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventors: Kazuki Fukuhara, Kentaro Sakamoto
  • Patent number: 10637322
    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: Grant
    Filed: May 23, 2018
    Date of Patent: April 28, 2020
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventors: Yasuhiro Hashimoto, Hideyuki Uzawa, Yasuhiro Yamagata
  • Patent number: 10560004
    Abstract: A sensor magnet holder is used to fix a sensor magnet to a motor shaft. The sensor magnet holder includes a press fitting part to which the motor shaft is press fitted; a holding part provided radially outside the press fitting part to hold the sensor magnet; and a joint part that joins the press fitting part and the holding part. The joint part is configured such that at least a part of the joint part is deflected by an external force.
    Type: Grant
    Filed: August 16, 2017
    Date of Patent: February 11, 2020
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventors: Kazuyuki Yamamoto, Satoshi Kikuchi
  • Patent number: 10560007
    Abstract: A motor includes: a cylindrical housing that houses a rotor; a first member mounted to an opening of the housing; and a second member sandwiching the first member as mounted between the second member and the housing. The housing includes, at an end of the housing that faces the second member, a first locking part that locks a first locked part of the second member. The second member is elastically deformed by the first locking part and locked to the housing accordingly and is configured such that a gap is formed between the second member and the housing when the second member is locked to the housing.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: February 11, 2020
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventors: Yasuhiro Yamagata, Isao Kubota
  • Patent number: 10447118
    Abstract: A motor apparatus includes a sensor magnet configured to rotate integrally with a drive shaft of a motor; a housing including a sensor housing section in which the sensor magnet is located; a pulse output board including a magnetically permeable base and a rotation detection element mounted on a mounting surface of the base and adapted to detect rotation of the sensor magnet and output a pulse; and a terminal electrically connected with the pulse output board, wherein the terminal includes an insertion slot into which the pulse output board is inserted, and the insertion slot opens to the sensor housing section, and when the pulse output board is inserted, the insertion slot supports the pulse output board in a neighborhood of the sensor magnet with a reverse surface on a side opposite the mounting surface of the base facing the sensor magnet and electrically connects the pulse output board.
    Type: Grant
    Filed: January 26, 2016
    Date of Patent: October 15, 2019
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventors: Kazuyuki Yamamoto, Satoshi Kikuchi
  • Patent number: 10418873
    Abstract: A brushless motor includes: a stator including an annular stator core and first through twelfth teeth provided circumferentially on an inner circumference of the stator core in a sequential order; first through twelfth coils wound around the first through twelfth teeth, respectively, and forming a delta connection; and a rotor provided at a center of the stator. The first through twelfth coils are configured such that: the twelfth, first, six, and seventh coils in series connection form a W-phase; the eighth, ninth, second, and third coils in series connection form a U-phase, the fourth, fifth, tenth, and eleventh coils in series connection form a V-phase, coils of different phases adjacent to each other in an arrangement on the teeth are wound in the same direction, and coils of the same phase adjacent to each other are wound in opposite directions.
    Type: Grant
    Filed: April 27, 2015
    Date of Patent: September 17, 2019
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventor: Yuya Iwasaki
  • Patent number: 10415705
    Abstract: A seal structure seals between a cover which closes an opening of a case for housing a part and the case by a sealing member. The cover is provided with an annular recessed portion attached to an end of a peripheral wall forming the opening of the case and a plurality of through-holes penetrating a bottom portion of the recessed portion and spaced apart from each other in a circumferential direction. The sealing member is formed integrally with the cover. The sealing member is integrally provided with a protrusion protruding from a bottom portion over an entire circumference in the recessed portion and an anchor portion engaged with each of the through-holes to fix the sealing member to the cover. Between at least the anchor portions in the recessed portion, a projecting portion for closing the gap between the protrusion and an inner wall of the recessed portion is provided.
    Type: Grant
    Filed: September 6, 2017
    Date of Patent: September 17, 2019
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventors: Goushi Murai, Junya Kurata
  • Patent number: 10411567
    Abstract: A motor includes a brush configured to contact a commutator and a movement restricting structure configured to restrict a movement of the brush. The movement restricting structure has: a carbon holder for housing the brush while permitting a movement of the brush in the commutator radial direction; and a circumferentially restricting part for restricting a movement of the brush in the commutator circumferential direction. The circumferentially restricting part has a passing port formed by punching, through which the brush passes.
    Type: Grant
    Filed: May 23, 2014
    Date of Patent: September 10, 2019
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventors: Atsushi Yoshida, Hisashi Ogino
  • Patent number: 10381961
    Abstract: A motor control circuit includes: first high and low side switches connected to one end of a drive coil of a brush-less motor, and second high and low side switches connected to the other end of the drive coil. In a first energization state, a positive drive current is supplied to the drive coil. In a second energization state, a negative drive current is supplied to the drive coil. In a first reflux state, a positive circulation current is applied to the drive coil after the first energization state. In a second reflux state, a negative circulation current is applied to the drive coil after the second energization state. A first non-energization state is between the first reflux state and the second energization state after the first reflux state, and a second non-energization state is between the second reflux state and the first energization state after the second reflux state.
    Type: Grant
    Filed: August 2, 2018
    Date of Patent: August 13, 2019
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventors: Ryo Niida, Yasuyuki Takamori
  • Patent number: 10367383
    Abstract: A fixing structure for a permanent magnet includes: a cylindrical housing; a permanent magnet housed inside the housing; and an adhesive layer formed in a gap G between the housing and the permanent magnet and having an adhesive for fixing the permanent magnet to the housing. The adhesive layer is formed such that a filling rate of the adhesive is higher in the gap at another axial end of the permanent magnet than at one axial end of the permanent magnet. The permanent magnet is configured such that a density at said other axial end is higher than the density at said one axial end.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: July 30, 2019
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventor: Yasuhiro Yamagata
  • Publication number: 20190227517
    Abstract: A motor control device includes: a rotational position calculator that calculates a rotational position of a motor that rotates a rotor; an operation state controller that controls a state of supply of operation power to the rotational position calculator; a deviation calculator that calculates a deviation of a rotational position of the rotor on the basis of a stop target rotational position of the rotor and the rotational position of the rotor after supply of a drive current to a coil is stopped and before supply of operation power to the rotational position calculator is stopped; a storage controller that stores the deviation on a storage; a rotational position control signal generator that generates a rotational position control signal for controlling the rotational position of the rotor on the basis of the deviation stored on the storage and the stop target rotational position of the rotor; and a drive current output unit that outputs the drive current to the coil on the basis of the rotational position
    Type: Application
    Filed: September 26, 2018
    Publication date: July 25, 2019
    Applicant: MABUCHI MOTOR CO., LTD.
    Inventors: Kazuki FUKUHARA, Kentaro SAKAMOTO
  • 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