Patents by Inventor Mitsumasa Mizuno
Mitsumasa Mizuno 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: 20240128809Abstract: A stator includes: a plurality of stator blocks; a plurality of coils; and a supporter supporting the plurality of stator blocks. Each of the plurality of stator blocks includes: a yoke portion located at its outermost perimeter; and a teeth portion protruding from an inner peripheral surface of the yoke portion. The yoke portion has a width dimension along the circumferential direction, and the width dimension of the yoke portion is greater than a width dimension of the teeth portion along the circumferential direction. The supporter is closed in the circumferential direction. The supporter holds the plurality of stator blocks such that the plurality of stator blocks are housed in an interior of the supporter. The supporter has an inner peripheral surface in contact with at least an outer peripheral surface of the yoke portion of each of the plurality of stator blocks.Type: ApplicationFiled: December 20, 2021Publication date: April 18, 2024Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Yuya AKO, Hideki TAMURA, Mitsumasa MIZUNO, Kenji OKADA
-
Publication number: 20240097511Abstract: A stator includes a plurality of stator blocks aligned in a circumferential direction and a plurality of coils each made of a winding wound around a corresponding one of the plurality of stator blocks. The stator includes a plurality of insulation members electrically insulating from the plurality of stator blocks from the plurality of coils for respective groups of the plurality of stator blocks and the plurality of coils. Each of the plurality of stator blocks includes a yoke portion located at its outermost perimeter and a teeth portion protruding from an inner peripheral surface of the yoke portion. Each of the plurality of insulation members includes a pair of insulating plates arranged to face each other across the teeth portion. Each of the pair of insulating plates has a width greater than a width of the teeth portion.Type: ApplicationFiled: December 20, 2021Publication date: March 21, 2024Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Hideki TAMURA, Kenji OKADA, Mitsumasa MIZUNO, Yuya AKO
-
Publication number: 20240097518Abstract: A stator includes a plurality of stator blocks aligned in a circumferential direction and a plurality of coils each made of a winding wound around a corresponding one of the plurality of stator blocks. The stator includes a plurality of insulation members electrically insulating from the plurality of stator blocks from the plurality of coils for respective groups of the plurality of stator blocks and the plurality of coils. Each of the plurality of stator blocks includes a yoke portion located at its outermost perimeter, a teeth portion protruding from an inner peripheral surface of the yoke portion, and an insulating portion being electrically insulating and covering a surface of the teeth portion. Each of the plurality of insulation members includes a pair of insulating plates. Each of the pair of insulating plates has a width greater than a width of the teeth portion, and the pair of insulating plates are arranged to face each other across the teeth portion.Type: ApplicationFiled: December 20, 2021Publication date: March 21, 2024Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Hideki TAMURA, Mitsumasa MIZUNO, Yuya AKO, Kenji OKADA
-
Publication number: 20240079928Abstract: An electric tool includes a motor. The motor includes a stator and a rotor. The rotor rotates with respect to the stator. At least one of the stator or the rotor includes a core (stator core or rotor core) that includes an oriented steel sheet.Type: ApplicationFiled: January 27, 2021Publication date: March 7, 2024Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Mitsumasa MIZUNO, Kenji OKADA, Hideki TAMURA, Yuya AKO
-
Patent number: 11890727Abstract: An electric power tool includes: a driving shaft that is rotated by a motor; an output shaft on which a front-end tool is attachable; and a torque transmission mechanism that transmits a torque produced by the rotation of the driving shaft to the output shaft. The torque transmission mechanism includes a magnet coupling including a driving magnet member coupled to a side of the driving shaft and a driven magnet member coupled to a side of the output shaft, and the driving magnet member and the driven magnet member are provided such that respective magnetic surfaces face each other, S-poles and N-poles being alternately arranged on each of the magnetic surfaces.Type: GrantFiled: December 20, 2021Date of Patent: February 6, 2024Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Itaru Murui, Hiroaki Murakami, Mitsumasa Mizuno, Akiko Honda, Satoshi Kajiyama
-
Patent number: 11876408Abstract: An electric tool includes a motor. The motor includes a stator core and a rotor. The rotor rotates with respect to the stator core. The rotor includes: a rotor core having a circular cylindrical shape; a plurality of permanent magnets; and an output shaft. The output shaft is held inside the rotor core. The plurality of permanent magnets are arranged as spokes around a center of the rotor core.Type: GrantFiled: November 21, 2019Date of Patent: January 16, 2024Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Mitsumasa Mizuno, Akito Nakamura, Koichiro Esaka, Kenji Okada
-
Patent number: 11724371Abstract: An electric power tool includes: an output shaft on which a front-end tool is adapted to be mounted; and a power transmission mechanism that transmits a rotational output of a motor to the output shaft. A posture information acquisition unit acquires posture information for identifying a posture of the electric power tool. A torque information acquisition unit acquires torque information indicating a measured value of tightening torque produced by the front-end tool. A transmission unit transmits the posture information, the torque information, and time information related to a time when respective information is acquired to an external apparatus.Type: GrantFiled: June 26, 2019Date of Patent: August 15, 2023Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Itaru Murui, Mitsumasa Mizuno, Hiroaki Murakami, Takashi Kusagawa, Masahiro Sato, Masanori Nakamoto, Akiko Honda
-
Patent number: 11569725Abstract: A torque transmission mechanism transmits a torque produced by a rotation of a driving shaft to an output shaft. A clutch mechanism is provided between a motor and the torque transmission mechanism. The torque transmission mechanism includes a magnet coupling including a driving magnet member coupled to the driving shaft side and a driven magnet member coupled to the output shaft side. The driving magnet member and the driven magnet member are arranged such that magnetic surfaces on each of which S-pole magnets and N-pole magnets are alternately arranged face other. The clutch mechanism transmits the torque produced by the rotation of the driving shaft to the driving magnet member but does not transmit a torque the driving magnet member receives from the driven magnet member to the driving shaft.Type: GrantFiled: June 15, 2018Date of Patent: January 31, 2023Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Mitsumasa Mizuno, Itaru Murui, Satoshi Kajiyama, Hiroaki Murakami, Akiko Honda
-
Publication number: 20220410352Abstract: An impact tool includes a motor, a hammer, and an anvil. The hammer is configured to be rotated around a rotation axis by motive power provided from the motor. The anvil is configured to be rotated around the rotation axis by receiving striking force from the hammer in a circumferential direction of the rotation axis. In the impact tool, moment of inertia of the hammer around the rotation axis is 10 or more times moment of inertia of the anvil around the rotation axis.Type: ApplicationFiled: June 24, 2022Publication date: December 29, 2022Inventors: Kimitaka OZAWA, Akiko HONDA, Takahiro UEDA, Takashi KUSAGAWA, Masaya SATO, Mitsumasa MIZUNO
-
Patent number: 11539272Abstract: A motor retainer is provided on an inner circumferential surface of a housing and retains an outer circumference of a motor unit. A rotation detector includes a rotating body attached to a motor shaft and a position detector that outputs a rotational position signal corresponding to a rotational position of the rotating body. A sensor substrate retainer is provided on the inner circumferential surface of the housing and retains the position detector at a position facing the rotating body.Type: GrantFiled: March 14, 2018Date of Patent: December 27, 2022Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Hiroaki Murakami, Mitsumasa Mizuno, Akiko Honda
-
Patent number: 11478916Abstract: An electric power tool includes: a motor unit including a motor; a driving block for transmitting a rotational output of the motor to a front-end tool; and a rotation detector that detects an angle of rotation of the motor. The rotation detector includes a rotating body attached to a motor shaft and a position detector that outputs a rotational position signal corresponding to a rotational position of the rotating body. The rotating body includes an opening, and the motor shaft is press fitted and fixed to the opening of the rotating body.Type: GrantFiled: March 14, 2018Date of Patent: October 25, 2022Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Hiroaki Murakami, Akiko Honda, Mitsumasa Mizuno
-
Publication number: 20220143789Abstract: A torque transmission mechanism includes a magnet coupling including a driving magnet member coupled to a driving shaft side and a driven magnet member coupled to an output shaft side. One of the driving magnet member or the driven magnet member rotatably supports the other of the driving magnet member or the driven magnet member.Type: ApplicationFiled: January 22, 2020Publication date: May 12, 2022Inventors: Takashi Kusagawa, Mitsumasa MIZUNO, Itaru MURUI
-
Publication number: 20220131434Abstract: An electric tool includes a motor. The motor includes a stator core and a rotor. The rotor rotates with respect to the stator core. The rotor includes: a rotor core having a circular cylindrical shape; a plurality of permanent magnets; and an output shaft. The output shaft is held inside the rotor core. The plurality of permanent magnets are arranged as spokes around a center of the rotor core.Type: ApplicationFiled: November 21, 2019Publication date: April 28, 2022Inventors: Mitsumasa MIZUNO, Akito NAKAMURA, Koichiro ESAKA, Kenji OKADA
-
Publication number: 20220123610Abstract: An electric tool includes a motor. The motor includes a stator core and a rotor. The rotor has an output shaft and rotates with respect to the stator core. The stator core includes: an inner cylindrical portion having a circular cylindrical shape; and a plurality of teeth. Inside the inner cylindrical portion, the rotor is arranged. Each of the plurality of teeth includes a body portion and a tip piece. The body portion protrudes outward from the inner cylindrical portion along a radius of the inner cylindrical portion. The tip piece extends, from a tip part of the body portion, in a direction intersecting with a direction in which the body portion protrudes.Type: ApplicationFiled: November 21, 2019Publication date: April 21, 2022Inventors: Koichiro ESAKA, Akito NAKAMURA, Kenji OKADA, Mitsumasa MIZUNO
-
Publication number: 20220111498Abstract: An electric power tool includes: a driving shaft that is rotated by a motor; an output shaft on which a front-end tool is attachable; and a torque transmission mechanism that transmits a torque produced by the rotation of the driving shaft to the output shaft. The torque transmission mechanism includes a magnet coupling including a driving magnet member coupled to a side of the driving shaft and a driven magnet member coupled to a side of the output shaft, and the driving magnet member and the driven magnet member are provided such that respective magnetic surfaces face each other, S-poles and N-poles being alternately arranged on each of the magnetic surfaces.Type: ApplicationFiled: December 20, 2021Publication date: April 14, 2022Inventors: Itaru MURUI, Hiroaki MURAKAMI, Mitsumasa MIZUNO, Akiko HONDA, Satoshi KAJIYAMA
-
Patent number: 11235445Abstract: An electric power tool includes: a driving shaft that is rotated by a motor; an output shaft on which a front-end tool is attachable; and a torque transmission mechanism that transmits a torque produced by the rotation of the driving shaft to the output shaft. The torque transmission mechanism includes a magnet coupling including a driving magnet member coupled to a side of the driving shaft and a driven magnet member coupled to a side of the output shaft, and the driving magnet member and the driven magnet member are provided such that respective magnetic surfaces face each other, S-poles and N-poles being alternately arranged on each of the magnetic surfaces.Type: GrantFiled: November 30, 2017Date of Patent: February 1, 2022Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Itaru Murui, Hiroaki Murakami, Mitsumasa Mizuno, Akiko Honda, Satoshi Kajiyama
-
Publication number: 20210331305Abstract: An electric power tool includes: a motor; an output shaft; and a power transmission mechanism that transmits a rotational output of the motor to the output shaft. A motor control unit controls rotation of the motor in accordance with an on operation of the user operation switch performed by a user. A detector detects physical quantity data while the motor is being rotated. A status determination unit determines whether the electric power tool is in a deteriorated status, by using the physical quantity data. A notification interface communicates that the electric power tool is in a deteriorated status while the motor is not being rotated.Type: ApplicationFiled: June 26, 2019Publication date: October 28, 2021Inventors: Itaru MURUI, Hiroaki MURAKAMI, Akiko HONDA, Masanori NAKAMOTO, Mitsumasa MIZUNO, Takashi KUSAGAWA, Masahiro SATO
-
Publication number: 20210323125Abstract: In an electric power tool, an acquisition unit acquires physical quantity data detected while a motor is being rotated. A storage unit stores the physical quantity data and time information related to time when the physical quantity data is acquired, mapping the physical quantity data and the time information to each other. A transmission unit transmits the physical quantity data and the time information to a server system. The server system includes: a server-side reception unit that receives the physical quantity data and the time information transmitted; and a status evaluation unit that evaluates a level of a status of the electric power tool by using the physical quantity data and the time information.Type: ApplicationFiled: June 26, 2019Publication date: October 21, 2021Inventors: Itaru MURUI, Hiroaki MURAKAMI, Akiko HONDA, Masanori NAKAMOTO, Takashi KUSAGAWA, Masahiro SATO, Mitsumasa MIZUNO
-
Publication number: 20210229256Abstract: A torque transmission mechanism includes a magnet coupling including a driving magnet member coupled to a side of driving shaft driven into rotation by a motor and a driven magnet member coupled to a side of an output shaft on which a front-end tool is attachable. A clutch mechanism is provided between the motor and the torque transmission mechanism. A moment of inertia on the side of the driven magnet member is larger than a moment of inertia on the side of the driving magnet member.Type: ApplicationFiled: March 20, 2019Publication date: July 29, 2021Inventors: Mitsumasa MIZUNO, Itaru MURUI, Atsushi NAKAMURA
-
Publication number: 20210086333Abstract: An impact rotary tool includes: a driver, a spindle, an anvil disposed in front of the spindle in a rotation axis direction, a main hammer applying a rotation force to the anvil, and a sub-hammer applying, to the main hammer having applied the rotation force to the anvil, a rotation force in the same direction.Type: ApplicationFiled: March 20, 2019Publication date: March 25, 2021Inventors: Hiroaki MURAKAMI, Itaru MURUl, Akiko HONDA, Mitsumasa MIZUNO