Patents by Inventor Satoru Akutsu
Satoru Akutsu 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: 7183952Abstract: A resolver can make accurate angle detection in an entire detection range. The resolver includes a resolver stator having an excitation winding of one phase adapted to be excited by a power supply and a first and a second output winding of two phases for outputting a change in the density of magnetic flux as a voltage, a resolver rotor arranged at a central portion of the resolver stator so as to cooperate with the resolver stator for changing a gap permeance between the resolver rotor and the resolver stator in accordance with the rotation of the resolver rotor, and a detection error correction part that corrects an angle detection error of the resolver by using the value of a Lissajous radius of a circular Lissajous waveform obtained from the amplitudes of an output signal Scos from the first output winding and an output signal Ssin from the second output winding.Type: GrantFiled: February 3, 2006Date of Patent: February 27, 2007Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Satoru Akutsu, Shinsuke Hemmi, Shuji Isono, Seiki Kodama
-
Patent number: 7009389Abstract: A highly accurate rotation angle detection device is realized by correcting a detecting position error caused by a machining error such as deterioration of roundness of an internal diameter of a stator. The rotation angle detection device is provided with a stator (12), which is provided with an exciting winding of one phase and two-phase output windings, and a rotor (13) having salient poles, in which the stator (12) has a plurality of teeth (11), the two-phase output windings are wound around the plurality of teeth, and the plurality of teeth include teeth for which the number of turns of the output windings is N and at least one of teeth for which the number of turns of the output windings is N±m (it is assumed that N and m are positive integers and N>m) and teeth for which the number of turns is m.Type: GrantFiled: March 25, 2005Date of Patent: March 7, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Masatsugu Nakano, Yukari Toide, Satoru Akutsu
-
Patent number: 6936949Abstract: A rotation angle detector includes a stator core (2) comprised of a plurality of core sheets (4) each having plural core members (4a) each including a tooth and a yoke portion (5a, . . . , 5h, 4b) disposed in a strip-like array with adjacent core members being coupled to one another by coupling means (4d) at yoke end portion. The core member is laminated. The stator core is shaped into an annular form by bending the core members at coupled portions so that the tooth portions extend centrally while capable of extending substantially linearly upon expansion thereof. An exciting winding (8) and output windings (9, 10) of n phases are wound on the tooth portions. A rotor core (3) is disposed rotatably relative to the stator core such that gap permeance between the rotor core and the tooth portions changes sinusoidally as a function of the rotation angle.Type: GrantFiled: November 22, 2002Date of Patent: August 30, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Satoru Akutsu, Tetsunao Takaki, Masafumi Okazaki, Toshinori Tanaka, Akira Hashimoto, Kazuyuki Yamamoto, Takeshi Sugiyama, Hideki Megata
-
Patent number: 6936942Abstract: A motor for an electric power steering apparatus can improve working efficiency, and can be reassembled without requiring any new or additional members. A bracket is disposed at an opening of a cylindrical bottomed frame. A stator with a stator winding is fixed to the frame around a rotor. Stator-side terminals each having a connection portion extending toward the bracket are disposed between the stator and the bracket, and are connected with the stator winding. A connector base includes connection terminals connected with tip ends of the connection portions, a base portion with the connection terminals disposed on a surface thereof, and nuts mounted on the base portion. Leads have, at their one end, lead-side terminals in contact with the connection terminals. Screws are threaded on the nuts, respectively, for coupling the connection terminals and the lead-side terminals.Type: GrantFiled: May 20, 2004Date of Patent: August 30, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Masafumi Okazaki, Satoru Akutsu, Shinsuke Hemmi
-
Publication number: 20050179329Abstract: A motor for an electric power steering apparatus can improve working efficiency, and can be reassembled without requiring any new or additional members. A bracket is disposed at an opening of a cylindrical bottomed frame. A stator with a stator winding is fixed to the frame around a rotor. Stator-side terminals each having a connection portion extending toward the bracket are disposed between the stator and the bracket, and are connected with the stator winding. A connector base includes connection terminals connected with tip ends of the connection portions, a base portion with the connection terminals disposed on a surface thereof, and nuts mounted on the base portion. Leads have, at their one end, lead-side terminals in contact with the connection terminals. Screws are threaded on the nuts, respectively, for coupling the connection terminals and the lead-side terminals.Type: ApplicationFiled: May 20, 2004Publication date: August 18, 2005Inventors: Masafumi Okazaki, Satoru Akutsu, Shinsuke Hemmi
-
Publication number: 20050168216Abstract: Upper and lower insulators are mounted so as to electrically insulate a sensor core and a sensor coil, a connector is formed integrally with the upper insulator so as to be positioned on an outer circumferential side of a yoke of the sensor core, and lead wire portions of conductor wires constituting an excitation winding and an output winding of the sensor coil are joined to terminal pins on an upper surface of the upper insulator so as to have a predetermined amount of slack.Type: ApplicationFiled: March 25, 2005Publication date: August 4, 2005Inventors: Satoru Akutsu, Tetsunao Takaki, Hideki Megata, Toshinori Tanaka, Takeshi Sugiyama
-
Publication number: 20050168217Abstract: A highly accurate rotation angle detection device is realized by correcting a detecting position error caused by a machining error such as deterioration of roundness of an internal diameter of a stator. The rotation angle detection device is provided with a stator (12), which is provided with an exciting winding of one phase and two-phase output windings, and a rotor (13) having salient poles, in which the stator (12) has a plurality of teeth (11), the two-phase output windings are wound around the plurality of teeth, and the plurality of teeth include teeth for which the number of turns of the output windings is N and at least one of teeth for which the number of turns of the output windings is N±m (it is assumed that N and m are positive integers and N>m) and teeth for which the number of turns is m.Type: ApplicationFiled: March 25, 2005Publication date: August 4, 2005Inventors: Masatsugu Nakano, Yukari Toide, Satoru Akutsu
-
Patent number: 6891365Abstract: A highly accurate rotation angle detection device is realized by correcting a detecting position error caused by a machining error such as deterioration of roundness of an internal diameter of a stator. The rotation angle detection device is provided with a stator (12), which is provided with an exciting winding of one phase and two-phase output windings, and a rotor (13) having salient poles, in which the stator (12) has a plurality of teeth (11), the two-phase output windings are wound around the plurality of teeth, and the plurality of teeth include teeth for which the number of turns of the output windings is N and at least one of teeth for which the number of turns of the output windings is N±m (it is assumed that N and m are positive integers and N>m) and teeth for which the number of turns is m.Type: GrantFiled: October 16, 2002Date of Patent: May 10, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Masatsugu Nakano, Yukari Toide, Satoru Akutsu
-
Patent number: 6882080Abstract: A stator core is formed into a cylindrical shape, 3n teeth are disposed at a predetermined pitch in a circumferential direction where n is a positive integer, and slots are formed between adjacent pairs of the teeth so as to open onto an inner circumferential side. A stator coil is installed as a concentrated winding in the stator core. A rotor is rotatably disposed inside the stator and 2n permanent magnets are disposed at a predetermined pitch in a circumferential direction on an outer peripheral portion of a shaft. The stator core is constructed such that a slot opening (d) and a slot pitch (p) at an inner circumferential surface of the stator core satisfy an expression 0.1?d/p?0.3.Type: GrantFiled: August 28, 2003Date of Patent: April 19, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Toshinori Tanaka, Yuusuke Matsui, Keiichi Fukazawa, Satoru Akutsu, Kengo Fujimoto, Katsumi Ohata, Takeshi Sugiyama
-
Publication number: 20040119363Abstract: A stator core is formed into a cylindrical shape, 3n teeth are disposed at a predetermined pitch in a circumferential direction where n is a positive integer, and slots are formed between adjacent pairs of the teeth so as to open onto an inner circumferential side. A stator coil is installed as a concentrated winding in the stator core. A rotor is rotatably disposed inside the stator and 2n permanent magnets are disposed at a predetermined pitch in a circumferential direction on an outer peripheral portion of a shaft. The stator core is constructed such that a slot opening (d) and a slot pitch (p) at an inner circumferential surface of the stator core satisfy an expression 0.1≦d/p≦0.3.Type: ApplicationFiled: August 28, 2003Publication date: June 24, 2004Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Toshinori Tanaka, Yuusuke Matsui, Keiichi Fukazawa, Satoru Akutsu, Kengo Fujimoto, Katsumi Ohata, Takeshi Sugiyama
-
Patent number: 6750574Abstract: A motor for use with a motorized power steering apparatus is provided in which the number of component members can be reduced, and workability in assembling the component members can be improved, while enabling miniaturization of the entire motor. The motor includes a bottomed cylindrical frame 31, a bracket 32 fixedly secured to the frame 31, a rotating element 8 having a shaft 7 rotatably supported by a frame side bearing 110 fixedly mounted on the frame 31 and a bracket side bearing 100 fixedly mounted on the bracket 32, a stationary element 6 fixedly attached to the frame 31 around an outer periphery of the rotating element 8 and having a stator winding 18 wound therearound, a rotation sensor 15 provided on the bracket 32 at a housing side of the bracket side bearing 100, and a plurality of sensor signal wires 38 for supplying and receiving signals to and from the rotation sensor 15.Type: GrantFiled: November 19, 2001Date of Patent: June 15, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Masafumi Okazaki, Yasuhide Yagyu, Hideki Megata, Tetsunao Takaki, Shinsuke Henmi, Satoru Akutsu, Takeshi Sugiyama
-
Patent number: 6707185Abstract: An electric power steering apparatus in which a housing (3) is formed with a housing opening (38) through which bus bars (20) pass for electrically connecting the motor (1) and the control circuit unit (2) with each other. A casing is formed with a heat sink opening (46) through which the bus bars (20) pass, so that the motor (1) and the control circuit unit (2) are integrated with each other with the housing opening (38) and the heat sink opening (46) disposed to correspond to each other.Type: GrantFiled: July 8, 2002Date of Patent: March 16, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Satoru Akutsu, Masafumi Okazaki, Hideki Megata, Shinsuke Hemmi, Masayoshi Nishikawa, Tetsunao Takaki, Toshinori Tanaka, Takeshi Sugiyama
-
Publication number: 20030222531Abstract: A rotation angle detector includes a stator core (2) comprised of a plurality of core sheets (4) each having plural core members (4a) each including a tooth and a yoke portion (5a, . . . , 5h, 4b) disposed in a strip-like array with adjacent core members being coupled to one another by coupling means (4d) at yoke end portion. The core member is laminated. The stator core is shaped into an annular form by bending the core members at coupled portions so that the tooth portions extend centrally while capable of extending substantially linearly upon expansion thereof. An exciting winding (8) and output windings (9, 10) of n phases are wound on the tooth portions. A rotor core (3) is disposed rotatably relative to the stator core such that gap permeance between the rotor core and the tooth portions changes sinusoidally as a function of the rotation angle.Type: ApplicationFiled: November 22, 2002Publication date: December 4, 2003Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Satoru Akutsu, Tetsunao Takaki, Masafumi Okazaki, Toshinori Tanaka, Akira Hashimoto, Kazuyuki Yamamoto, Takeshi Sugiyama, Hideki Megata
-
Publication number: 20030137295Abstract: Upper and lower insulators are mounted so as to electrically insulate a sensor core and a sensor coil, a connector is formed integrally with the upper insulator so as to be positioned on an outer circumferential side of a yoke of the sensor core, and lead wire portions of conductor wires constituting an excitation winding and an output winding of the sensor coil are joined to terminal pins on an upper surface of the upper insulator so as to have a predetermined amount of slack.Type: ApplicationFiled: December 17, 2002Publication date: July 24, 2003Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Satoru Akutsu, Tetsunao Takaki, Hideki Megata, Toshinori Tanaka, Takeshi Sugiyama
-
Publication number: 20030127921Abstract: An electric power steering apparatus in which a housing (3) is formed with a housing opening (38) through which bus bars (20) pass for electrically connecting the motor (1) and the control circuit unit (2) with each other. A casing is formed with a heat sink opening (46) through which the bus bars (20) pass, so that the motor (1) and the control circuit unit (2) are integrated with each other with the housing opening (38) and the heat sink opening (46) disposed to correspond to each other.Type: ApplicationFiled: July 8, 2002Publication date: July 10, 2003Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Satoru Akutsu, Masafumi Okazaki, Hideki Megata, Shinsuke Hemmi, Masayoshi Nishikawa, Tetsunao Takaki, Toshinori Tanaka, Takeshi Sugiyama
-
Publication number: 20030074799Abstract: A highly accurate rotation angle detection device is realized by correcting a detecting position error caused by a machining error such as deterioration of roundness of an internal diameter of a stator. The rotation angle detection device is provided with a stator (12), which is provided with an exciting winding of one phase and two-phase output windings, and a rotor (13) having salient poles, in which the stator (12) has a plurality of teeth (11), the two-phase output windings are wound around the plurality of teeth, and the plurality of teeth include teeth for which the number of turns of the output windings is N and at least one of teeth for which the number of turns of the output windings is N±m (it is assumed that N and m are positive integers and N>m) and teeth for which the number of turns is m.Type: ApplicationFiled: October 16, 2002Publication date: April 24, 2003Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Masatsugu Nakano, Yukari Toide, Satoru Akutsu
-
Patent number: 6518687Abstract: In a stator for a starter motor including an approximately cylindrical yoke, poles disposed inside the yoke, and field windings wound around the poles, the yoke is formed of a plurality of cylindrical cores having a different diameter and stacked in a radial direction to reduce the manufacturing cost of the yoke.Type: GrantFiled: February 7, 2001Date of Patent: February 11, 2003Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Satoru Akutsu, Shigeru Shiroyama
-
Publication number: 20020175574Abstract: A motor for use with a motorized power steering apparatus is provided in which the number of component members can be reduced, and workability in assembling the component members can be improved, while enabling miniaturization of the entire motor. The motor includes a bottomed cylindrical frame 31, a bracket 32 fixedly secured to the frame 31, a rotating element 8 having a shaft 7 rotatably supported by a frame side bearing 110 fixedly mounted on the frame 31 and a bracket side bearing 100 fixedly mounted on the bracket 32, a stationary element 6 fixedly attached to the frame 31 around an outer periphery of the rotating element 8 and having a stator winding 18 wound therearound, a rotation sensor 15 provided on the bracket 32 at a housing side of the bracket side bearing 100, and a plurality of sensor signal wires 38 for supplying and receiving signals to and from the rotation sensor 15.Type: ApplicationFiled: November 19, 2001Publication date: November 28, 2002Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Masafumi Okazaki, Yasuhide Yagyu, Hideki Megata, Tetsunao Takaki, Shinsuke Henmi, Satoru Akutsu, Takeshi Sugiyama
-
Patent number: 6476533Abstract: In a stator, which is composed of a stacked core, for a starter motor according to the present invention, the stacked core being arranged such that a plurality of sheet members each having a yoke portion and a pole portion are disposed like a band, adjacent sheet members are stacked and coupled with each other so that the ends of the yoke portions thereof are overlapped, the plurality of sheet members are made to an annular shape by being bent at the coupled portions thereof to cause the pole portions to face the center of the annular shape, and the plurality of sheet members are formed in at least an approximately linear shape when developed, resin winding cores are interposed between the pole potions and wires wound around the pole portions. With this arrangement, there can be obtained a stator for a starter motor the cost of which can be reduced.Type: GrantFiled: January 25, 2001Date of Patent: November 5, 2002Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Satoru Akutsu, Yuji Nakahara
-
Patent number: 6362553Abstract: An object of the present invention is to provide a low cost, high performance, thin structure rotary motor for driving medium used in magnetic disk drive unit, optical disk drive unit or the like, in order to improve the productivity of terminating processing and the reliability of the coils. Magnetic materials which are divided to a plurality of blocks or divided corresponding to respective magnetic pole teeth are connected by means of thin portions. The respective magnetic pole teeth are wound continuously with wire without cutting the wire at the positions in which the thin portions are connected. When a stator is assembled, a plurality of blocks or magnetic pole teeth are disposed on a substrate by separating or bending the thin portions.Type: GrantFiled: December 23, 1998Date of Patent: March 26, 2002Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yuji Nakahara, Kenichi Azuma, Masaru Matsumoto, Youichi Fujita, Satoru Akutsu, Akira Hashimoto, Yasunori Takai, Tadashi Hasegawa, Hiroshi Miyazaki, Junji Kawada