Patents by Inventor Tomoyoshi Sawada
Tomoyoshi Sawada 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).
-
Patent number: 11018538Abstract: A rotor assembly includes a shaft disposed along a central axis extending vertically, a tubular magnet disposed on a radially outer surface of the shaft, a lower spacer disposed axially below the magnet and fixed to the radially outer surface of the shaft, a shaft adhesive film attaching the shaft to the magnet, and a lower spacer adhesive film attaching an axially upper surface of the lower spacer to an axially lower surface of the magnet. The shaft adhesive film and the lower spacer adhesive film are an identical adhesive and are continuously formed.Type: GrantFiled: March 18, 2019Date of Patent: May 25, 2021Assignee: NIDEC CORPORATIONInventor: Tomoyoshi Sawada
-
Patent number: 10517448Abstract: A blower apparatus according to an exemplary embodiment of the present invention includes a motor including a shaft arranged to extend along a central axis extending in a vertical direction, and a bearing arranged to rotatably support the shaft; an impeller coupled to the shaft on an upper end side of the shaft; an impeller housing arranged to house the impeller, and including an air inlet on an upper side; a plurality of stationary vanes arranged on a lower side of the impeller housing; a cylindrical first ring arranged radially inside of the stationary vanes; and a cylindrical second ring arranged radially outside of the stationary vanes, and fixed to the impeller housing. The stationary vanes, the first ring, and the second ring are defined by a single monolithic member, and together define at least a portion of a stationary vane support portion.Type: GrantFiled: October 30, 2015Date of Patent: December 31, 2019Assignee: NIDEC CORPORATIONInventors: Kazuhiko Shiozawa, Ryosuke Hayamitsu, Tomoyoshi Sawada
-
Publication number: 20190305620Abstract: A rotor assembly includes a shaft disposed along a central axis extending vertically, a tubular magnet disposed on a radially outer surface of the shaft, a lower spacer disposed axially below the magnet and fixed to the radially outer surface of the shaft, a shaft adhesive film attaching the shaft to the magnet, and a lower spacer adhesive film attaching an axially upper surface of the lower spacer to an axially lower surface of the magnet. The shaft adhesive film and the lower spacer adhesive film are an identical adhesive and are continuously formed.Type: ApplicationFiled: March 18, 2019Publication date: October 3, 2019Inventor: Tomoyoshi SAWADA
-
Publication number: 20190165651Abstract: A motor including a shaft that is disposed along a vertically extending central axis in which the shaft rotates about the central axis, a magnet and a cooling member that are fixed to the shaft, a stator disposed so as to oppose the magnet in a radial direction, the stator including a coil, a motor housing that accommodates therein the shaft, the magnet, the stator, and the cooling member. The cooling member opposes, in the axial direction, the magnet directly or with another member interposed therebetween. A plurality of protruded portions are provided on the cooling member in which the plurality of protruded portions are protruded in the radial direction and are disposed in a circumferential direction.Type: ApplicationFiled: May 30, 2018Publication date: May 30, 2019Inventors: Sakae KISHI, Tomoyoshi SAWADA, Takumi IWAO
-
Publication number: 20190101132Abstract: A blower includes an impeller fixed to a shaft extending along a central axis in an up-down direction, the impeller being rotatable about the central axis, a motor rotating the impeller, a motor housing outside the motor in a radial direction, a blower case outside the motor housing in the radial direction, and a circuit board below a lower end of the motor housing. A flow passage in communication with the impeller is between a radially outer surface of the motor housing and a radially inner surface of the blower case. The circuit board includes a circuit board through hole that penetrates through the circuit board in the axial direction inside the radially outer surface of the motor housing in the radial direction.Type: ApplicationFiled: September 20, 2018Publication date: April 4, 2019Inventors: Akikazu FUJIWARA, Tomoyoshi SAWADA, Yoichi ENOMOTO, Yuki MASUI
-
Publication number: 20180209442Abstract: A blower device includes an impeller that is rotatable around a rotary shaft extending in an up-down direction; a motor that rotationally drives the impeller; a motor housing accommodating the motor; a cylindrical member disposed outwardly of the housing in a radial direction; and an impeller case accommodating the impeller. A gap is formed between the housing and the cylindrical member. Stationary blades are provided on one of the outer side surface of the housing and the inner side surface of the cylindrical member, and protrude towards the other side surface. At an outer portion of the housing in the radial direction, the blades are disposed side by side in a circumferential direction, and form air-current paths. At least one of the blades includes a protrusion that protrudes from a surface of the at least one of the blades facing the radial direction and contacts the other side surface.Type: ApplicationFiled: June 30, 2016Publication date: July 26, 2018Inventors: Tomoyoshi SAWADA, Machiko FUKUSHIMA, Haruki YOSHIMATSU
-
Publication number: 20180163747Abstract: A blower according to an exemplary embodiment of the present disclosure includes a rotor that has a shaft disposed extending vertically, a stator positioned at an outer side of the rotor in a radial direction, a cylindrical housing extending in the axial direction and accommodating the rotor and the stator, and an impeller attached to the shaft, at an upper side from the stator. The stator includes a ring-shaped core back portion, plurality of teeth portions extending from the core back portion toward an inner side in the radial direction, an insulator that covers at least part of the teeth portions, a coil wound on each of the teeth portions via the insulator, and a flow path forming member of which at least part is positioned further at an inner side in the radial direction than the core back portion. The housing has a through hole that opens to the inner side.Type: ApplicationFiled: October 30, 2015Publication date: June 14, 2018Inventors: Ryosuke HAYAMITSU, Tomoyoshi SAWADA, Kazuhiko SHIOZAWA
-
Publication number: 20180156233Abstract: A blower according to an exemplarily embodiment of the present disclosure includes a motor that includes a shaft disposed along a center axis extending vertically; an impeller that is connected to the shaft and rotates integrally with the shaft; an impeller housing that is disposed on an upper side of the impeller or a radially outer side of the impeller; a motor housing that is disposed on a radially outer side of the motor; a passage member that is disposed on a radially outer side of the motor housing with a gap interposed therebetween; and a plurality of stator blades that are arranged in a circumferential direction in the gap between the motor housing and the passage member. At least one of the stator blades includes a first stator blade disposed on either one of the motor housing and the passage member, and a second stator blade disposed on the other one of the motor housing and the passage member.Type: ApplicationFiled: May 24, 2016Publication date: June 7, 2018Inventors: Tomoyoshi SAWADA, Machiko FUKUSHIMA
-
Publication number: 20180100517Abstract: A centrifugal blower includes a motor including a stator and a motor cover, a centrifugal impeller rotating together with a rotating portion of the motor, and a blower casing. The stator includes a stator core including a toric core back. The motor cover includes an upper surface, and a cylindrical outer peripheral surface extending downwards. The blower casing disposed above the impeller includes an upper side casing top plate portion in which an intake port is disposed at the middle, and a cylindrical wall portion extending downwards from the upper side casing top plate portion. An inner peripheral surface of the wall portion and the outer peripheral surface of the motor cover forms a flow path continuous in the axial direction. A discharge port is formed in a lower end portion of the flow path. The core back includes an exposed portion exposed to the flow path.Type: ApplicationFiled: October 30, 2015Publication date: April 12, 2018Inventors: Tomoyoshi SAWADA, Machiko FUKUSHIMA
-
Patent number: 9893590Abstract: A rotor portion includes an upper cylindrical portion and a lower cylindrical portion, each of which is configured to rotate together with a rotor. A stator portion includes a circuit board including a rotation detection portion located thereon. The lower cylindrical portion includes a lower balance correction portion. The upper cylindrical portion includes an upper balance correction portion. In addition, a detectable portion configured to be detected by the rotation detection portion is provided on the upper cylindrical portion.Type: GrantFiled: December 11, 2014Date of Patent: February 13, 2018Assignee: NIDEC CORPORATIONInventors: Tomoyoshi Sawada, Yuya Oura
-
Publication number: 20170367550Abstract: A blower apparatus according to an exemplary embodiment of the present invention includes a motor including a shaft arranged to extend along a central axis extending in a vertical direction, and a bearing arranged to rotatably support the shaft; an impeller coupled to the shaft on an upper end side of the shaft; an impeller housing arranged to house the impeller, and including an air inlet on an upper side; a plurality of stationary vanes arranged on a lower side of the impeller housing; a cylindrical first ring arranged radially inside of the stationary vanes; and a cylindrical second ring arranged radially outside of the stationary vanes, and fixed to the impeller housing. The stationary vanes, the first ring, and the second ring are defined by a single monolithic member, and together define at least a portion of a stationary vane support portion.Type: ApplicationFiled: October 30, 2015Publication date: December 28, 2017Inventors: Kazuhiko SHIOZAWA, Ryosuke HAYAMITSU, Tomoyoshi SAWADA
-
Publication number: 20150311769Abstract: A rotor portion includes an upper cylindrical portion and a lower cylindrical portion, each of which is configured to rotate together with a rotor. A stator portion includes a circuit board including a rotation detection portion located thereon. The lower cylindrical portion includes a lower balance correction portion. The upper cylindrical portion includes an upper balance correction portion. In addition, a detectable portion configured to be detected by the rotation detection portion is provided on the upper cylindrical portion.Type: ApplicationFiled: December 11, 2014Publication date: October 29, 2015Inventors: Tomoyoshi SAWADA, Yuya OURA
-
Patent number: 8847461Abstract: A stator core includes three split cores, each of the split cores including a core-back portion including an inner surface facing a rotor, a tooth base portion protruding radially inwards from the inner surface of the core-back portion and a pair of tooth overhang portions protruding from both sides of a tip end of the tooth base portion in a circumferential direction. The inner surface of the core-back portion including a pair of orthogonal surface regions extending from both sides of a base end of the tooth base portion in a direction orthogonal or substantially orthogonal to the tooth base portion, the orthogonal surface regions extending radially outwards beyond projection positions of tip ends of the tooth overhang portions when the tooth overhang portions are projected on an imaginary plane including the orthogonal surface regions in parallel or substantially in parallel to the tooth base portion.Type: GrantFiled: November 30, 2011Date of Patent: September 30, 2014Assignee: Nidec CorporationInventor: Tomoyoshi Sawada
-
Publication number: 20120139385Abstract: A stator core includes three split cores, each of the split cores including a core-back portion including an inner surface facing a rotor, a tooth base portion protruding radially inwards from the inner surface of the core-back portion and a pair of tooth overhang portions protruding from both sides of a tip end of the tooth base portion in a circumferential direction. The inner surface of the core-back portion including a pair of orthogonal surface regions extending from both sides of a base end of the tooth base portion in a direction orthogonal or substantially orthogonal to the tooth base portion, the orthogonal surface regions extending radially outwards beyond projection positions of tip ends of the tooth overhang portions when the tooth overhang portions are projected on an imaginary plane including the orthogonal surface regions in parallel or substantially in parallel to the tooth base portion.Type: ApplicationFiled: November 30, 2011Publication date: June 7, 2012Applicant: NIDEC TECHNO MOTOR HOLDINGS CORPORATIONInventor: Tomoyoshi SAWADA
-
Patent number: 5307691Abstract: A torque transducer including a ferromagneto-stricting device provided for a rotational shaft, a magnetic field supply device for supplying a magnetic field to the ferromagneto-stricting device, a sensing device for sensing a change in the magnetic permeability of the ferromagneto-stricting device caused by torque applied to the rotational shaft, a fixed housing for rotatably supporting the rotational shaft, an electromagnetic shielding device for electrically shielding the magnetic field supply device and the sensing device, and a spacer interposed between the fixed housing and the electromagnetic shielding device for causing the electromagnetic shielding device to be held in the fixed housing.Type: GrantFiled: September 25, 1992Date of Patent: May 3, 1994Assignee: Kubota CorporationInventors: Katsuyuki Miyake, Tomoyoshi Sawada, Mutsumi Sunahata
-
Patent number: 5255567Abstract: A torque transducer including: a ferromagneto-stricting device provided for a rotational shaft; a magnetic field supply device for supplying a magnetic field to the ferromagneto-stricting device; a sensing device for sensing the change in the magnetic permeability which has taken place due to torque acting on the rotational shaft; a fixed housing for rotatably supporting the rotational shaft via a bearing unit; and an electromagnetic shielding device for surrounding the magnetic field supply device and the sensing device to electromagnetically shield them. The magnetic field supply device comprises an exciting coil, while the sensing device comprises a sensing coil. The electromagnetic shielding device is supported by the fixed housing via an elastic holding member. A seal member is disposed outside the bearing unit. The fixed housing and the electromagnetic shielding device are electrically earthed.Type: GrantFiled: June 26, 1991Date of Patent: October 26, 1993Assignee: Nippon Densan CorporationInventors: Katsuyuki Miyake, Tomoyoshi Sawada