Patents by Inventor Youichi Fujita
Youichi Fujita 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).
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Patent number: 9647601Abstract: A coil temperature estimation unit 12 estimates the coil temperature of a motor 1 from the equivalent resistance, heat capacity and thermal resistance of the coil of the motor 1, which are given in advance, from the applied voltage to the motor 1 detected by a voltage detector 17, and from a duty ratio command value input from the outside. When a temperature abnormality deciding unit 13 decides that the coil temperature is not normal, a duty limiter 14 limits the duty ratio command value at a low value and outputs it to a FET driving circuit 15.Type: GrantFiled: August 12, 2013Date of Patent: May 9, 2017Assignee: Mitsubishi Electric CorporationInventors: Yoshitaka Ikitake, Youichi Fujita, Satoshi Kawamura
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Publication number: 20160134225Abstract: A coil temperature estimation unit 12 estimates the coil temperature of a motor 1 from the equivalent resistance, heat capacity and thermal resistance of the coil of the motor 1, which are given in advance, from the applied voltage to the motor 1 detected by a voltage detector 17, and from a duty ratio command value input from the outside. When a temperature abnormality deciding unit 13 decides that the coil temperature is not normal, a duty limiter 14 limits the duty ratio command value at a low value and outputs it to a FET driving circuit 15.Type: ApplicationFiled: August 12, 2013Publication date: May 12, 2016Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Yoshitaka IKITAKE, Youichi FUJITA, Satoshi KAWAMURA
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Patent number: 8690122Abstract: A valve device has integrally assembled thereto a valve side housing 2 having a valve seat 1, a motor side housing 4 provided with a motor 3, and a feeder-side housing 5 having a feeder unit, wherein a valve stem 8 provided with a valve 7 for abutting against the valve seat 1 is extended to the interior of the feeder-side housing, a rotation stopper 9 of the valve stem 8 is provided at a predetermined position of the valve stem on its way to the feeder-side housing, a screw section 11 is provided around the portion of the valve stem passing through the center hole 35a of the rotor 35 of the motor 3, the screw section being in mesh with a thread section 10 formed around the surface of the center hole thereof, and a valve position detecting sensor is provided within the feeder-side housing 5.Type: GrantFiled: September 8, 2008Date of Patent: April 8, 2014Assignee: Mitsubishi Electric CorporationInventors: Tomokuni Kato, Masayuki Yokoyama, Youichi Fujita
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Patent number: 8093774Abstract: A direct current motor includes: a stator (2) on which a plurality of coils (4) is provided; a rotor (8) including a plurality of permanent magnet magnetic poles (9) that is provided so as to face an inner periphery of the stator, and a pipe (11) on one end; a current-carrying portion (19) that is provided on the other end of the rotor (8) and commutates current supplied from a power source to the coils (4) on the stator (2); a sleeve bearing (6) that holds the rotor (8); and a ball bearing (7) that holds the rotor (8) and has a larger load-bearing capacity than that of the sleeve bearing (6). Furthermore, the pipe (11) holds the ball bearing (7) and is in direct contact with the ball bearing (7).Type: GrantFiled: November 19, 2007Date of Patent: January 10, 2012Assignee: Mitsubishi Electric CorporationInventors: Masayuki Yokoyama, Youichi Fujita, Sotsuo Miyoshi, Naohiro Oketani
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Patent number: 8044545Abstract: To provide a DC motor in which the rattling and the axial deviation of a rotor are restrained without increasing the axial dimension of the motor. This DC motor comprises a stator (2) on which coils (4) are provided, a rotor (8) so disposed as to be opposed to the inner periphery of the stator (2) and having magnetic poles, a current-carrying part provided at one end of the rotor (8) and transferring the current fed from a power supply to the coils (4) of the stator (2), a sleeve bearing (6) holding the rotor (8), and a ball bearing (7) holding the rotor (8) and having a load-carrying capacity larger than that of the sleeve bearing (6). The outer ring of the ball bearing (7) is positioned by the stator (2), and the inner ring of the ball bearing (7) is positioned by the rotor (8).Type: GrantFiled: November 26, 2007Date of Patent: October 25, 2011Assignee: Mitsubishi Electric CorporationInventors: Masayuki Yokoyama, Youichi Fujita, Sotsuo Miyoshi, Naohiro Oketani
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Patent number: 7900081Abstract: A microcomputer includes a main oscillator for generating and outputting a main clock signal, a sub oscillator for generating and outputting a sub clock signal, a central processing unit that operates based on the main clock signal, a signal output circuit that operates based on the sub clock signal and outputs a timing signal at a predetermined interval, and a voltage monitoring circuit that operates based on the sub clock signal and intermittently performs a voltage monitoring function in response to the timing signal. The sub oscillator operates independently of the main oscillator.Type: GrantFiled: July 26, 2007Date of Patent: March 1, 2011Assignee: Denso CorporationInventors: Chikara Kobayashi, Shinichirou Taguchi, Yoshinori Gotoh, Youichi Fujita, Hideaki Ishihara
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Publication number: 20100270872Abstract: A bearing device for a rotary motor 1 includes a stator 20 having provided thereon a coil 22 to which a current is fed; a rotor 30 rotating the inside of the stator 20 and having a rotor magnet 32; a motor shaft 33 having a screw portion meshing with a threaded aperture 31a provided within the rotor 30; a bearing support member 40 having a bearing 41 for the motor shaft 33 and molded of a thermoplastic resin; and a bearing side case 50 for housing the bearing support member 40 and molded of a thermoplastic resin, wherein an insert nut 46 is installed across the bearing side case and bearing support member to be united through outsert-molding.Type: ApplicationFiled: September 8, 2008Publication date: October 28, 2010Inventors: Masayuki Yokoyama, Youichi Fujita, Sotsuo Miyoshi
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Publication number: 20100270486Abstract: A valve device has integrally assembled thereto a valve side housing 2 having a valve seat 1, a motor side housing 4 provided with a motor 3, and a feeder-side housing 5 having a feeder unit, wherein a valve stem 8 provided with a valve 7 for abutting against the valve seat 1 is extended to the interior of the feeder-side housing, a rotation stopper 9 of the valve stem 8 is provided at a predetermined position of the valve stem on its way to the feeder-side housing, a screw section 11 is provided around the portion of the valve stem passing through the center hole 35a of the rotor 35 of the motor 3, the screw section being in mesh with a thread section 10 formed around the surface of the center hole thereof, and a valve position detecting sensor is provided within the feeder-side housing 5.Type: ApplicationFiled: September 8, 2008Publication date: October 28, 2010Inventors: Tomokuni Kato, Masayuki Yokoyama, Youichi Fujita
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Patent number: 7728479Abstract: In a DC-motor according to the present invention, contact areas of first brushes can be enlarged without enlarging the external diameter of a disk on which a commutator is provided; therefore, the wear resistance of the first brushes can be enhanced while maintaining a good control-response; and at the same time, the axial dimension can be shortened dramatically, so that the DC-motor can be downsized. The first brushes 14 are radially in contact with the commutator 11, and second brushes 15 are axially in contact with slip rings 12 that are formed circumferentially inside the commutator 11.Type: GrantFiled: November 30, 2006Date of Patent: June 1, 2010Assignee: Mitsubishi Electric CorporationInventors: Masayuki Yokoyama, Youichi Fujita, Sotsuo Miyoshi, Naohiro Oketani
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Publication number: 20100060094Abstract: [PROBLEMS] To provide a DC motor in which the rattling and the axial deviation of a rotor are restrained without increasing the axial dimension of the motor. [MEANS FOR SOLVING THE PROBLEMS] This DC motor comprises a stator (2) on which coils (4) are provided, a rotor (8) so disposed as to be opposed to the inner periphery of the stator (2) and having magnetic poles, a current-carrying part provided at one end of the rotor (8) and transferring the current fed from a power supply to the coils (4) of the stator (2), a sleeve bearing (6) holding the rotor (8), and a ball bearing (7) holding the rotor (8) and having a load-carrying capacity larger than that of the sleeve bearing (6). The outer ring of the ball bearing (7) is positioned by the stator (2), and the inner ring of the ball bearing (7) is positioned by the rotor (8).Type: ApplicationFiled: November 26, 2007Publication date: March 11, 2010Applicant: Mitsubishi Electric CorporationInventors: Masayuki Yokoyama, Youichi Fujita, Sotsuo Miyoshi, Naohiro Oketani
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Publication number: 20100026118Abstract: A direct current motor includes: a stator (2) on which a plurality of coils (4) is provided; a rotor (8) including a plurality of permanent magnet magnetic poles (9) that is provided so as to face an inner periphery of the stator, and a pipe (11) on one end; a current-carrying portion (19) that is provided on the other end of the rotor (8) and commutates current supplied from a power source to the coils (4) on the stator (2); a sleeve bearing (6) that holds the rotor (8); and a ball bearing (7) that holds the rotor (8) and has a larger load-bearing capacity than that of the sleeve bearing (6). Furthermore, the pipe (11) holds the ball bearing (7) and is in direct contact with the ball bearing (7).Type: ApplicationFiled: November 19, 2007Publication date: February 4, 2010Applicant: Mitsubishi Electric CorporationInventors: Masayuki Yokoyama, Youichi Fujita, Sotsuo Miyoshi, Nahiro Oketani
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Patent number: 7600738Abstract: Output shaft coupling structure of electrically operated control valve including: valve rod which is provided with valve for opening and closing fluid passage and is mounted to valve housing in such a way as to move along axial direction; and electrically controlled motor for driving the valve rod along the axial direction, the coupling structure couples motor shaft of the electrically controlled motor to the valve rod, and the plate shaped like a flat plate is fixed at its center to end portion, to which the valve rod is coupled, of the motor shaft and the plate is bent to form hooking and engaging portion at its both ends after the plate is fixed, thereby the plate hooks and engages with the valve rod.Type: GrantFiled: February 15, 2005Date of Patent: October 13, 2009Assignee: Mitsubishi Electric CorporationInventors: Kenta Hatano, Sotsuo Miyoshi, Youichi Fujita
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Publication number: 20090091207Abstract: In a DC-motor according to the present invention, contact areas of first brushes can be enlarged without enlarging the external diameter of a disk on which a commutator is provided; therefore, the wear resistance of the first brushes can be enhanced while maintaining a good control-response; and at the same time, the axial dimension can be shortened dramatically, so that the DC-motor can be downsized. The first brushes 14 are radially in contact with the commutator 11, and second brushes 15 are axially in contact with slip rings 12 that are formed circumferentially inside the commutator 11.Type: ApplicationFiled: November 30, 2006Publication date: April 9, 2009Inventors: Masayuki Yokoyama, Youichi Fujita, Sotsuo Miyoshi, Naohiro Oketani
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Patent number: 7358632Abstract: A sliding hole is formed so that a screw portion can pass therethrough. Also, a seal member is provided at a portion, through which the screw portion placed in the sliding hole can pass and in which a sliding portion does not slide.Type: GrantFiled: June 27, 2006Date of Patent: April 15, 2008Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kenta Hatano, Youichi Fujita, Sotsuo Miyoshi, Tomokuni Kato
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Publication number: 20080052555Abstract: A microcomputer includes a main oscillator for generating and outputting a main clock signal, a sub oscillator for generating and outputting a sub clock signal, a central processing unit that operates based on the main clock signal, a signal output circuit that operates based on the sub clock signal and outputs a timing signal at a predetermined interval, and a voltage monitoring circuit that operates based on the sub clock signal and intermittently performs a voltage monitoring function in response to the timing signal. The sub oscillator operates independently of the main oscillator.Type: ApplicationFiled: July 26, 2007Publication date: February 28, 2008Applicant: DENSO CORPORATIONInventors: Chikara Kobayashi, Shinichirou Taguchi, Yoshinori Gotoh, Youichi Fujita, Hideaki Ishihara
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Patent number: 7274122Abstract: A sliding hole is formed so that a screw portion can pass therethrough. Also, a seal member is provided at a portion, through which the screw portion placed in the sliding hole can pass and in which a sliding portion does not slide.Type: GrantFiled: June 27, 2006Date of Patent: September 25, 2007Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kenta Hatano, Youichi Fujita, Sotsuo Miyoshi, Tomokuni Kato
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Patent number: 7205690Abstract: A sliding hole is formed so that a screw portion can pass therethrough. Also, a seal member is provided at a portion, through which the screw portion placed in the sliding hole can pass and in which a sliding portion does not slide.Type: GrantFiled: July 19, 2004Date of Patent: April 17, 2007Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kenta Hatano, Youichi Fujita, Sotsuo Miyoshi, Tomokuni Kato
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Publication number: 20060244323Abstract: A sliding hole is formed so that a screw portion can pass therethrough. Also, a seal member is provided at a portion, through which the screw portion placed in the sliding hole can pass and in which a sliding portion does not slide.Type: ApplicationFiled: June 27, 2006Publication date: November 2, 2006Inventors: Kenta Hatano, Youichi Fujita, Sotsuo Miyoshi, Tomokuni Kato
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Publication number: 20060238047Abstract: A sliding hole is formed so that a screw portion can pass therethrough. Also, a seal member is provided at a portion, through which the screw portion placed in the sliding hole can pass and in which a sliding portion does not slide.Type: ApplicationFiled: June 27, 2006Publication date: October 26, 2006Inventors: Kenta Hatano, Youichi Fujita, Sotsuo Miyoshi, Tomokumi Kato
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Publication number: 20060238046Abstract: A sliding hole is formed so that a screw portion can pass therethrough. Also, a seal member is provided at a portion, through which the screw portion placed in the sliding hole can pass and in which a sliding portion does not slide.Type: ApplicationFiled: June 27, 2006Publication date: October 26, 2006Inventors: Kenta Hatano, Youichi Fujita, Sotsuo Miyoshi, Tomokuni Kato