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).
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Patent number: 11001297Abstract: To provide an electric motor control system and an electric power steering apparatus that torque of the electric motor can be increased for ensuring of steering performance even at the time of abnormality occurrence. The controller is provided with 2 sets of control systems which control a supply current to each set of the windings. When abnormality occurs in one set of the windings and the control system, the electric motor control system sets 0 to supply current to all phase or partial phase windings of abnormality occurrence set, and increase supply current to normal set of the windings up to an irreversible current that increase an irreversible demagnetizing factor of the permanent magnet more than the normal time.Type: GrantFiled: March 14, 2016Date of Patent: May 11, 2021Assignee: Mitsubishi Electric CorporationInventors: Yuji Takizawa, Satoru Akutsu, Yoshihito Asao
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Publication number: 20210135513Abstract: A permanent-magnet synchronous motor and an electric power steering device are driven by a first system including a first armature winding and a first control apparatus and by a second system including a second armature winding and a second control apparatus and are configured in such a way that if one system fails, driving by the one system is stopped but the driving is continued by the other system.Type: ApplicationFiled: September 7, 2017Publication date: May 6, 2021Applicant: Mitsubishi Electric CorporationInventors: Yuji TAKIZAWA, Hiroko IKEDA, Kazumasa ITO, Shinich YAMAGUCHI, Yu HIROTANI, Satoru AKUTSU
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Publication number: 20210111659Abstract: The invention includes a first power supply connector, which connects a first inverter unit that supplies a drive current to a first three-phase winding of a rotary electric machine to a first vehicle power supply, and a second power supply connector, which connects a first second inverter unit that supplies a drive current to a second three-phase winding of the rotary electric machine to a second vehicle power supply, wherein a voltage of the first vehicle power supply is higher than a voltage of the second vehicle power supply, and a current capacity of the first power supply connector is smaller than a current capacity of the second power supply connector.Type: ApplicationFiled: June 5, 2017Publication date: April 15, 2021Applicant: Mitsubishi Electric CorporationInventor: SATORU AKUTSU
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Publication number: 20210104972Abstract: Provided is an electric power steering device including a motor-including a first and a second three-phase windings, first and second inverter circuits configured to supply electric power to the first and second three-phase windings, respectively, a boost circuit configured to change a voltage of electric power to be supplied to each of the first and second inverter circuits, and a drive unit configured to cause, when an abnormality occurs in any one of a first system including the first three-phase winding and the first inverter circuit and a second system including the second three-phase winding and the second inverter circuit, to supply electric power at a higher voltage than a voltage before the occurrence of the abnormality to an inverter circuit included in a normal system by the boost circuit, the normal system being one of the first system and the second system, to thereby drive the inverter circuit.Type: ApplicationFiled: September 26, 2018Publication date: April 8, 2021Applicant: Mitsubishi Electric CorporationInventor: Satoru AKUTSU
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Publication number: 20210075305Abstract: A permanent magnet motor includes a rotor having a field pole of a rotor core, wherein the field pole has a radius smaller than an arc centered on a shaft of the rotor, a multiple of slits are formed in the field pole, the multiple of slits are disposed so that an interval between a first central line positioned between a multiple of the slits and a second central line positioned between a neighboring multiple of the slits increases as the first central line and the second central line head toward an outer peripheral side of the rotor core, and of the multiple of slits of the field pole, a first slit disposed in a central position of the field pole, and a second slit and a third slit disposed on either side of the first slit, are disposed within 20% of a circumferential direction width of the permanent magnet.Type: ApplicationFiled: February 28, 2018Publication date: March 11, 2021Applicant: Mitsubishi Electric CorporationInventors: Yuji TAKIZAWA, Hiroko IKEDA, Shinichi YAMAGUCHI, Yu HIROTANI, Masafumi OKAZAKI, Satoru AKUTSU
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Patent number: 10944347Abstract: Provided is a rotary electrical machine, which is reduced in size of a motor through use of reluctance torque being a feature of an IPM motor, and in which, in driving in times other than a rated time, a current phase angle is shifted from an angle at which a total torque is maximized so that an increase in torque ripple is suppressed even when the current phase angle changes, to thereby provide characteristics of small size, high output, and low torque ripple.Type: GrantFiled: February 16, 2017Date of Patent: March 9, 2021Assignee: Mitsubishi Electric CorporationInventors: Yuji Takizawa, Yu Hirotani, Masafumi Okazaki, Satoru Akutsu
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Patent number: 10916983Abstract: A permanent-magnet motor includes a through-hole expansion portion provided in a through-hole for inserting a permanent magnet into the rotor core of a permanent-magnet motor, and a bridge portion that surrounds adjacent through-hole expansion portions and forms part of the outer circumferential surface of the rotor core; the bridge portion has a small-thickness portion that is formed to be smaller than that of a portion, other than the bridge portion, of the rotor core.Type: GrantFiled: May 10, 2016Date of Patent: February 9, 2021Assignee: Mitsubishi Electric CorporationInventors: Hiroshi Aida, Masafumi Okazaki, Satoru Akutsu, Yoshihito Asao, Yuji Takizawa
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Patent number: 10913488Abstract: An electric power steering device of a steer-by-wire type includes: a steering input mechanism, which includes a steering wheel to be operated by a driver; a reaction force motor, which is configured to apply a steering reaction force to the steering wheel; a steering motor, which is configured to output a steering force; a steering mechanism, which is prevented from being mechanically connected to the steering input mechanism, and is configured to steer a steered wheel through the steering force generated by the steering motor; and a drive control device, which is configured to carry out drive control for the steering motor and the reaction force motor. At least one of the steering motor or the reaction force motor is constructed of a double-winding motor of a double-inverter type in which each of windings is duplexed, and the respective duplexed windings are individually driven by two inverters.Type: GrantFiled: December 28, 2015Date of Patent: February 9, 2021Assignee: Mitsubishi Electric CorporationInventors: Satoru Akutsu, Yoshihito Asao
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Patent number: 10910892Abstract: In the rotary electric machine according to the present invention, a plurality of core sheets include linked core sheets that include linking portions that protrude circumferentially from flange portions so as to link together tip portions of adjacent tooth portions, at least one sheet of the linked core sheets is formed such that a tooth tip portion shape is mirror-asymmetrical relative to a tooth central axis that passes through a circumferential center of the tooth portions, and a stator core is configured by laminating the linked core sheets such that circumferential positions of the linking portions are offset.Type: GrantFiled: April 22, 2015Date of Patent: February 2, 2021Assignee: Mitsubishi Electric CorporationInventors: Yu Hirotani, Kazumasa Ito, Yuji Takizawa, Satoru Akutsu, Hiroshi Aida, Shusuke Hori
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Patent number: 10903769Abstract: Provided is a rotary electrical machine, which is reduced in size of a motor through use of reluctance torque being a feature of an IPM motor, and in which, in driving in times other than a rated time, a current phase angle is shifted from an angle at which a total torque is maximized so that an increase in torque ripple is suppressed even when the current phase angle changes, to thereby provide characteristics of small size, high output, and low torque ripple.Type: GrantFiled: February 16, 2017Date of Patent: January 26, 2021Assignee: Mitsubishi Electric CorporationInventors: Yuji Takizawa, Yu Hirotani, Masafumi Okazaki, Satoru Akutsu
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Patent number: 10903724Abstract: The present invention provides a rotation angle detector capable of detecting a rotation angle of a rotor in the same manner as at normal time even when abnormality such as disconnection or a short circuit occurs, and capable of reducing the number of terminals. When one spatial order cycle of the output winding is an electrical angle of 360°, a phase difference between a first output winding and a second output winding and a phase difference between the second output winding and a third output winding are set at an electrical angle ?, and ??180°×n (n is an integer).Type: GrantFiled: December 28, 2015Date of Patent: January 26, 2021Assignee: Mitsubishi Electric CorporationInventors: Hiroko Ikeda, Yusuke Morita, Kazumasa Ito, Yu Hirotani, Kodai Okazaki, Satoru Akutsu, Yuji Takizawa
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Patent number: 10840756Abstract: A front iron core includes a first iron core main body and a plurality of first projecting sections which project to a radial outer side from the first iron core main body. A second iron core includes a second iron core main body which overlaps with the first iron core main body and a plurality of second projecting sections which project to a radial outer side from the second iron core main body. When a rotor iron core is viewed along the axis line, portions of the second projecting sections protrude as extension sections to outward in the circumferential direction, from the first projecting sections. Furthermore, when the rotor iron core is viewed along the axis line, radial-direction outer side end surfaces of the extension parts are smoothly continuous with radial-direction outer side end surfaces of the first projecting sections.Type: GrantFiled: March 2, 2015Date of Patent: November 17, 2020Assignee: Mitsubishi Electric CorporationInventors: Yuji Takizawa, Satoru Akutsu, Shusuke Hori
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Patent number: 10840832Abstract: A permanent-magnet three-phase duplex motor is provided with two systems, namely a system that includes a first three-phase winding and a first inverter circuit, and a system that includes a second three-phase winding and a second inverter circuit, and a controlling apparatus is configured such that when one system fails, the controlling apparatus stops operation of the inverter circuit of the failed system, and controls operation of the inverter circuit of the normal system to increase the driving current that is supplied from the inverter circuit of the normal system, and the first three-phase winding and the second three-phase winding are configured such that magnetic fields that act on the permanent magnets in a demagnetizing direction when the increased driving current is supplied from the inverter circuit of the normal system are equal to magnetic fields that normally act on the permanent magnets in the demagnetizing direction.Type: GrantFiled: February 17, 2015Date of Patent: November 17, 2020Assignee: Mitsubishi Electric CorporationInventors: Satoru Akutsu, Yoshihito Asao
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Patent number: 10819176Abstract: Provided is an electric motor including a permanent magnet rotor and two sets of multi-phase windings serving as coil windings of a stator. The coil windings are wound around teeth by concentrated winding. The multi-phase windings of one of the two sets are wound around every other tooth by skipping one tooth in between. The multi-phase windings of another of the two sets are wound around the teeth skipped by the multi-phase windings of the one set. Adjacent coil windings of the two sets are wound in the same direction. A control unit configured to supply power to the coil windings includes control circuits independent of each other to provide one control circuit for each of the two sets of coil windings, and the control unit controls the control circuits with two sets of control signals having a phase difference of 150 degrees.Type: GrantFiled: March 29, 2016Date of Patent: October 27, 2020Assignee: Mitsubishi Electric CorporationInventors: Shusuke Hori, Shinsuke Hemmi, Tatsuki Kawashima, Satoru Akutsu, Yu Kawano
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Publication number: 20200321899Abstract: To provide a rotary electric machine apparatus which can make the rotary electric machine output torque, and can change characteristics of a rotary electric machine according to change of the DC power voltage, even if failure occurs in one DC power source. A rotary electric machine apparatus (1) is provided with a power source switching mechanism (23) that switches between the DC power of low voltage and the DC power of high voltage; a winding connection switching mechanism (24) that switches interconnection of the plural-phase windings between a first winding connection state, and a second winding connection state in which an induced voltage constant of windings becomes lower than the first winding connection state; a inverter (12) provided with the switching devices; and a controller (25) that switches the power source switching mechanism (23), switches the winding connection switching mechanism (24), and controls on/off of the switching devices.Type: ApplicationFiled: March 2, 2018Publication date: October 8, 2020Applicant: Mitsubishi Electric CorporationInventor: Satoru AKUTSU
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Publication number: 20200247462Abstract: An electric power steering device of a steer-by-wire type includes: a steering input mechanism, which includes a steering wheel to be operated by a driver; a reaction force motor, which is configured to apply a steering reaction force to the steering wheel; a steering motor, which is configured to output a steering force; a steering mechanism, which is prevented from being mechanically connected to the steering input mechanism, and is configured to steer a steered wheel through the steering force generated by the steering motor; and a drive control device, which is configured to carry out drive control for the steering motor and the reaction force motor. At least one of the steering motor or the reaction force motor is constructed of a double-winding motor of a double-inverter type in which each of windings is duplexed, and the respective duplexed windings are individually driven by two inverters.Type: ApplicationFiled: December 28, 2015Publication date: August 6, 2020Applicant: Mitsubishi Electric CorporationInventors: Satoru AKUTSU, Yoshihito ASAO
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Publication number: 20200177060Abstract: In an electric driving apparatus, a first rotational angle detecting sensor that generates a signal that corresponds to rotation of a shaft is disposed between a controlling apparatus and a motor. A housing accommodates the motor, the controlling apparatus, and the first rotational angle detecting sensor together. A second rotational angle detecting sensor that generates a signal that corresponds to rotation of the shaft is disposed at a position that is further away from the motor than the controlling apparatus in the axial direction of the shaft, and is disposed outside the housing. The first rotational angle detecting sensor is a magnetic detecting element sensor that includes: a magnet rotating body that includes a magnet, and that rotates together with the shaft; and a magnetic detecting element that detects magnetism from the magnet. The second rotational angle detecting sensor is a resolver.Type: ApplicationFiled: August 23, 2017Publication date: June 4, 2020Applicant: Mitsubishi Electric CorporationInventors: Saki SHIMADA, Isao SONODA, Hideya NISHIKAWA, Satoru AKUTSU
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Patent number: 10673309Abstract: An inverter-integrated motor according to the present invention is configured such that an inverter module and a motor are integrated so as to line up in an axial direction of the motor, the inverter module is configured into a single member in which are integrated: a power portion that includes an inverter; and a control portion that includes a microcomputer, and the motor includes: a rotor; a stator; and a pair of housings that include bearings that support a shaft of the rotor.Type: GrantFiled: August 5, 2015Date of Patent: June 2, 2020Assignee: Mitsubishi Electric CorporationInventors: Satoru Akutsu, Yoshihito Asao
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Patent number: 10644573Abstract: Provided is a permanent magnet motor including an armature, a rotor, and an angle detector. The angle detector includes a sensor magnet and a semiconductor sensor. The sensor magnet is magnetized into two poles and is provided in an end portion of a rotation shaft, and has the same rotation center as that of the rotation shaft. The semiconductor sensor is opposed to the sensor magnet in an extension direction of the rotation shaft. The semiconductor sensor and the sensor magnet have a gap formed therebetween, and a plate member made of a magnetic substance is provided between the semiconductor sensor and an end portion of the armature iron core on the semiconductor sensor side.Type: GrantFiled: December 25, 2015Date of Patent: May 5, 2020Assignee: Mitsubishi Electric CorporationInventors: Yuji Takizawa, Kentaro Urimoto, Satoru Akutsu
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Patent number: 10644642Abstract: To provide a three phase duplexing motor for electric power steering apparatus that can manage increase in a supply current and can manage influence on motor, when increasing a supply current to the three phase windings of the normal set. An three phase duplexing motor for electric power steering apparatus sets 0 to a supply current to three phase winding of abnormality occurrence set, and increases a supply current to three phase windings of the normal set, with a preliminarily set increase upper limit current value as an upper limit.Type: GrantFiled: March 14, 2016Date of Patent: May 5, 2020Assignee: Mitsubishi Electric CorporationInventors: Satoru Akutsu, Yoshihito Asao