Patents by Inventor Yoshihito Asao
Yoshihito Asao 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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Publication number: 20150303776Abstract: A driving-device-integral-type rotary electric machine includes a driving device 8 having a first inverter 27a and a second inverter 27b, which can supply power to stator windings 5a and 5b of the rotary electric machine 2, and the first inverter 27a and the second inverter 27b are arranged and installed in a heat sink 19, in a state where the inverters are linearly symmetrical with respect to an axis X of the rotary electric machine 2, and the heat sink is configured in such a way that at least a heat capacity of a portion with respect to the first inverter 27a is roughly equal to a heat capacity of a portion with respect to the second inverter 27b.Type: ApplicationFiled: January 25, 2012Publication date: October 22, 2015Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Satoru AKUTSU, Yoshihito ASAO
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Patent number: 9129931Abstract: A power semiconductor module includes: a plurality of first metal plates arranged in the same planar state; a power semiconductor chip mounted on the first metal plate; and an overbridge-shaped second metal plate which is composed of bridge frame sections and leg sections that support the bridge frame sections, the leg sections being for appropriately performing solder bonding between electrodes of the power semiconductor chips and between the electrode of the power semiconductor chip and the first metal plate, the power semiconductor module being configured by a resin package in which these members are sealed with electrically insulating resin. In the power semiconductor module, the solder bonding section of the leg section is formed in a planar shape by bending process and is provided at a position lower than the bridge frame section.Type: GrantFiled: April 27, 2011Date of Patent: September 8, 2015Assignee: Mitsubishi Electric CorporationInventors: Katsuhiko Omae, Mamoru Watanabe, Tetsushi Watanabe, Yoshihito Asao
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Patent number: 9129949Abstract: A power semiconductor module (100) includes: an electrode plate (2) in which a body portion (2a) and an external connection terminal portion (2b) are integrally formed, and the body portion (2a) is arranged on the same flat surface; a semiconductor chip (1) mounted on one surface (mounting surface) (2c) of the body portion (2a); and a resin package (3) in which the other surface (heat dissipation surface) (2d) of the body portion (2a) is exposed, and the body portion (2a) of the electrode plate (2) and the semiconductor chip (1) are sealed with resin. The heat dissipation surface (2d) is the same surface as the bottom (3a) of the resin package (3); and consequently, heat dissipation properties and reliability are improved and a reduction in size can be achieved.Type: GrantFiled: February 9, 2011Date of Patent: September 8, 2015Assignee: Mitsubishi Electric CorporationInventors: Shinsuke Asada, Kenjiro Nagao, Dai Nakajima, Yuetsu Watanabe, Yoshihito Asao, Takuya Oga, Masaki Kato
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Patent number: 9123693Abstract: There is provided a mold module and an electric power steering apparatus in which the temperature distribution in electronic components such as semiconductor chips utilized in an electronic relay and an inverter circuit unit is equalized and hence the heat radiation performance can be improved. In a mold module according to the present invention, a plurality of terminals for forming wiring leads and a plurality of electronic components mounted on the respective terminals are molded with a molding resin; at least part of the plurality of terminals are exposed at the rear side of the molding resin; an electric power steering apparatus according to the present invention utilizes the mold module.Type: GrantFiled: April 7, 2011Date of Patent: September 1, 2015Assignee: Mitsubishi Electric CorporationInventors: Daisuke Tanaka, Yoshihito Asao, Katsuhiko Omae, Tetsushi Watanabe
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Patent number: 9088196Abstract: A motor drive device employed, for example, in an electric power steering apparatus for vehicle, achieves a reduction not only in size but also in vibration and noise at the same time. At least one of a motor drive control unit (30) and a motor (10) is provided with at least two screw holes (53) for fixation to a gear (speed reducer) of an electric power steering apparatus. Let L1 be a maximum value of a distance between center points of the screw holes (53) and L2 be a distance between an end face (D) of a stator iron core (12) in an axial direction on a farther side from the gear and an attachment surface (C) attached to a gear side, then a value of L1 is equal to or greater than a value of L2.Type: GrantFiled: May 20, 2011Date of Patent: July 21, 2015Assignee: Mitsubishi Electric CorporationInventors: Masatsugu Nakano, Satoru Akutsu, Yoshihito Asao
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Patent number: 9079603Abstract: A motor for an electric power steering apparatus is obtained which can reduce the number of parts required. The motor has terminals for electrically connecting between leads and a stator coil. Each terminal is a band-shaped conductive member that has a pair of connector side terminal end portions at its opposite ends, respectively, when developed, and a plurality of stator side terminal portions protruding to one side of the conductive member along a longitudinal direction thereof. Each terminal is deformed in its thickness direction into a circular shape, and the connector side terminal end portions being bent in the same plane are connected with each other to form a connector side terminal portion. The connector side terminal portion is connected to the leads, and the stator side terminal portions are connected to the stator coil.Type: GrantFiled: December 22, 2008Date of Patent: July 14, 2015Assignee: Mitsubishi Electric CorporationInventors: Yukitaka Isshiki, Yoshihito Asao, Masashi Hashimoto, Takehiro Kobayashi
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Patent number: 9054563Abstract: A motor for an electric power steering device, includes: a housing side bearing which is placed on the output side of a shaft of a rotor placed in a frame, and is supported by a housing connected to the frame; and a frame side bearing which is placed on the opposite output side of the shaft of the rotor, and is composed of an outer ring and an inner ring supported by the frame.Type: GrantFiled: February 9, 2011Date of Patent: June 9, 2015Assignee: Mitsubishi Electric CorporationInventors: Toshihiro Matsunaga, Yoshihito Asao, Satoru Akutsu, Kazuhisa Takashima
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Patent number: 9035505Abstract: Provided is a motor for an electric power steering apparatus, in which vibrations and noises are suppressed. The motor for an electric power steering apparatus includes: a motor section (1) for outputting an assist torque to a handle of a vehicle; and a controller (2) for controlling driving of the motor section (1). The motor section (1) includes: a rotor (14, 14A) having P poles; and a stator (15, 15A) provided so as to surround the rotor (14, 14A), the stator including: a stator core (23) provided with n slots formed thereon and housed in a frame (4); and three-phase stator windings (25) wound around the slots (22). The controller (2) is provided between a boss (18) and the motor section (1) so as to surround the output shaft (12).Type: GrantFiled: October 6, 2010Date of Patent: May 19, 2015Assignee: Mitsubishi Electric CorporationInventors: Satoru Akutsu, Kazuhisa Takashima, Yoshihito Asao
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Publication number: 20150076950Abstract: A method of manufacturing a rotor for a magnet type rotating electrical machine includes the steps of: cutting and laminating pieces of the core of the rotor, to thereby form a core (3); mounting the core (3) on a rotating jig (10); forming a magnet piece (2p) into a predetermined shape by sintering; mounting a predetermined number of the magnet pieces (2p) on a regulating jig (20); pressing the magnet pieces (2p) by the regulating jig (20) while rotating the core (3) by the rotating jig (10), to thereby mount the magnet pieces (2p) on the core (3); and adjusting an axial position of the magnet piece (2p) so that an axial end surface of the core (3) and an axial end surface of the magnet piece (2p) are aligned with each other.Type: ApplicationFiled: October 22, 2012Publication date: March 19, 2015Applicant: Mitsubishi Electric CorporationInventors: Yoshihito Asao, Masayuki Miyaoka, Ryusuke Katayama, Akihiko Mori
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Patent number: 8924081Abstract: An electric power steering apparatus and control device integrated-type electric motor includes an electric motor driving circuit constituted by a plurality of semiconductor power elements and controlling electric power supplied to an armature winding of an electric motor, a switch device for opening and closing a connection between an input terminal of the electric motor driving circuit and an external power source, and another switch device for opening and closing the armature winding, wherein at least one of both the switch devices is constituted by a semiconductor switch element, and the power elements and the semiconductor switch element are mounted on a board attached to a metallic case.Type: GrantFiled: July 16, 2008Date of Patent: December 30, 2014Assignee: Mitsubishi Electric CorporationInventors: Isao Sonoda, Yoshihito Asao
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Publication number: 20140346910Abstract: In a permanent magnet type concentrated winding motor, the number of magnetic poles is M, a stator Sr has an N number of teeth T around which coils are concentratedly wound and which are circumferentially arranged at equal intervals, M is equal to (18±4)n and N is equal to 18n, an armature winding AW has an m number of parallel circuits, and a 1-phase circuit of the parallel circuits is configured to have a 6n/m number of coils connected in series with each other.Type: ApplicationFiled: December 12, 2011Publication date: November 27, 2014Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Masatsugu Nakano, Satoru Akutsu, Yoshihito Asao, Yuji Takizawa, Yu Hirotani, Ryuichi Takiguchi
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Publication number: 20140326530Abstract: An electric power steering apparatus (1) is provided with a heat sink (5) and an intermediate member (4) whose surface portions are perpendicularly placed with respect to an axial direction of a motor's shaft center, and arranged in such a way that each of power modules (51a, 51b) of a plurality of driving circuits is attached on a surface portion of the heat sink (5) so that an extending direction of a maximum outer dimension of the power modules (51a, 51b) is perpendicular to the axial direction, and each of electric devices (C1a-C1b) of the plurality of driving circuits is attached on a surface portion of the intermediate member (4) so that an extending direction of a maximum outer dimension of the electric devices (C1a-C1b) is perpendicular to the axial direction.Type: ApplicationFiled: July 5, 2012Publication date: November 6, 2014Applicant: Mitsubishi Electric CorporationInventors: Yoshihito Asao, Akihiko Mori
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Patent number: 8878474Abstract: Provided is a motor control device (10) for controlling a motor (5) provided with a plurality of sets of windings, in which, when a current control unit (23) detects a short-circuit failure as a primary failure, the current control unit (23) continues the control, and, further, when the current control unit (23) detects a secondary failure, the current control unit (23) provides control of opening a power supply relay (3). Accordingly, in a case where a failure of a winding of a motor or an inverter occurs, a torque pulsation is restrained and a sufficient output torque is provided, and further, in a case where a secondary failure occurs, excessive heat generation and current consumption are prevented and the cost of the device is reduced.Type: GrantFiled: September 12, 2012Date of Patent: November 4, 2014Assignee: Mitsubishi Electric CorporationInventors: Isao Kezobo, Kosuke Nakano, Yoshihito Asao
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Publication number: 20140246999Abstract: There is provided a motor control device for controlling a motor including plural sets of windings, which is configured so that, when a fault detection means detects a fault, inverters in the normal side other than in the fault side are continued to be controlled by normal-time current control means and further, inverters in the fault side are continued to be controlled by fault-time voltage commands generated by a fault-time current control means configured with a fault-time normal-side command generator and a fault-time fault-side command generator, so as to emphasis a torque ripple of the motor when a winding fault of the motor or an inverter fault occurs, to thereby cause a user to surely recognize the fault.Type: ApplicationFiled: January 27, 2012Publication date: September 4, 2014Applicant: Mitsubishi Electric CorporationInventors: Isao Kezobo, Kosuke Nakano, Yoshihito Asao, Akira Furukawa
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Publication number: 20140239765Abstract: To obtain a permanent magnet synchronous motor suitable for an electric power steering system, in which the magnet thickness (magnet used amount) can be reduced while securing demagnetization resistance and torque characteristics. In a permanent magnet synchronous motor including a rotor in which plural permanent magnets are arranged at an outer periphery of a rotor core, which is supported so as to rotate freely, and a stator provided at the outside of the stator and having stator windings 5 and a stator core, when a gap length between the outer periphery of the permanent magnet and an internal periphery of the stator core is “L” [mm] and the thickness of the central portion of the permanent magnet in the motor rotation direction is “t” [mm], the gap length “L” and the thickness “t” is set in a range of L?1[mm] as well as t/(t+L)?0.Type: ApplicationFiled: May 6, 2014Publication date: August 28, 2014Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Satoru AKUTSU, Kazuhisa TAKASHIMA, Yoshihito ASAO
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Publication number: 20140239780Abstract: An integral-type electric power steering device is configured in such a way that a motor component (40), a reduction mechanism (20), and a control device (50) are integrally fixed, and the control device (50) includes at least heating elements (531) having the control-circuit elements, which are operated so as to generate heat, a control board (53) on which the heating elements (531) are mounted, and a mechanism components (500) for fixing the control board (50); and at least a part of the heat, which is generated by the heating elements (531), is conducted to the mechanism components (500) via a thermal-conductive component (57).Type: ApplicationFiled: May 28, 2012Publication date: August 28, 2014Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Daisuke Tanaka, Yoshihito Asao
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Publication number: 20140191628Abstract: A permanent magnet motor in which electromagnetic excitation force of low spatial order is reduced, and influence of a magnetomotive force harmonic of a rotor and torque ripple is reduced. One set of armature windings receives current from a first inverter, and another set of armature windings receives current from a second inverter. Where a pole number of a rotor is M and the number of slots of a stator core is Q, M and Q satisfy M<Q and a greatest common divisor of M and Q is equal to or greater than 3. In the rotor, the iron core is located beyond a radius intermediate the maximum outer radius and the minimum inner radius of the permanent magnets. A phase difference between three-phase currents from the first and second inverters is in a range of electrical angles of 20 to 40 degrees.Type: ApplicationFiled: December 23, 2011Publication date: July 10, 2014Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Masatsugu Nakano, Yoshihito Asao, Satoru Akutsu, Ryuichi Takiguchi, Yuji Takizawa, Yu Hirotani
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Patent number: 8749977Abstract: A power semiconductor module includes: a first metal substrate on which a power semiconductor device is mounted; a second metal substrate on which a power semiconductor device is not mounted; and an electrically insulating resin package which seals the first metal substrate and the second metal substrate. The back surface of the first metal substrate on the side opposite to the mounting surface of the power semiconductor device is made to expose outside the resin package to form a heat dissipation surface.Type: GrantFiled: August 5, 2011Date of Patent: June 10, 2014Assignee: Mitsubishi Electric CorporationInventors: Shinsuke Asada, Yuetsu Watanabe, Yoshihito Asao, Kenjiro Nagao
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Publication number: 20140151146Abstract: There is provided a mold module and an electric power steering apparatus in which the temperature distribution in electronic components such as semiconductor chips utilized in an electronic relay and an inverter circuit unit is equalized and hence the heat radiation performance can be improved. In a mold module according to the present invention, a plurality of terminals for forming wiring leads and a plurality of electronic components mounted on the respective terminals are molded with a molding resin; at least part of the plurality of terminals are exposed at the rear side of the molding resin; an electric power steering apparatus according to the present invention utilizes the mold module.Type: ApplicationFiled: April 7, 2011Publication date: June 5, 2014Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Daisuke Tanaka, Yoshihito Asao, Katsuhiko Omae, Tetsushi Watanabe
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Publication number: 20140145548Abstract: A material of the stator core is different from a material of the housings, in a state where one end portion in the axis direction of the stator core is contacted to the first housing, and the other end portion in the axis direction of the stator core is contacted to the second housing; and a neighboring portion of a contact portion, at which the first housing is contacted to the stator core, and another neighboring portion of a contact portion, at which the second housing is contacted to the stator core, are connected by a connecting component in the axis direction, of which material is the same as a material of the stator core, whereby the first housing and the second housing are connected each other; and the first housing and the second housing face each other in a state where a gap intervenes between both housings.Type: ApplicationFiled: October 6, 2011Publication date: May 29, 2014Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Yoshihito Asao, Isao Sonoda, Kohei Ushio, Satoru Akutsu
