Patents by Inventor Eigo Totoki
Eigo Totoki 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: 11855500Abstract: When the number of teeth included in an in-phase teeth group is represented by T, a first half-slot adjacent to a k-th tooth is represented by A(k, 1), and a second half-slot adjacent to the k-th tooth is represented by A(k, 2), the number of turns of the coil arranged in A(1, 1) is the same as the number of turns of the coil arranged in A(T, 2), the number of turns of the coil arranged in A(1, 1) is different from the number of turns of the coil arranged in A(1, 2). The number of turns of the coil arranged in A(k, 2) is different from the number of turns of the coil arranged in A(k+1, 1), and the number of turns of the coils provided in the slot is twice the number of turns of the coil arranged in A(1, 1).Type: GrantFiled: March 4, 2019Date of Patent: December 26, 2023Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Junka Otosaka, Eigo Totoki, Toshinori Tanaka
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Publication number: 20220085678Abstract: When the number of teeth included in an in-phase teeth group is represented by T, a first half-slot adjacent to a k-th tooth is represented by A(k, 1), and a second half-slot adjacent to the k-th tooth is represented by A(k, 2), the number of turns of the coil arranged in A(1, 1) is the same as the number of turns of the coil arranged in A(T, 2), the number of turns of the coil arranged in A(1, 1) is different from the number of turns of the coil arranged in A(1, 2). The number of turns of the coil arranged in A(k, 2) is different from the number of turns of the coil arranged in A(k+1, 1), and the number of turns of the coils provided in the slot is twice the number of turns of the coil arranged in A(1, 1).Type: ApplicationFiled: March 4, 2019Publication date: March 17, 2022Applicant: Mitsubishi Electric CorporationInventors: Junka OTOSAKA, Eigo TOTOKI, Toshinori TANAKA
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Publication number: 20180076675Abstract: Two teeth on which windings are wound, and a teeth connecting portion disposed between the two teeth, connecting the teeth together, and having a mounting hole formed therein, are arranged in a line in a second direction, which is an arrangement direction. The teeth connecting portion has a support that supports the windings. The support has projections protruding from both end portions in the second direction of the teeth connecting portion to both sides in a first direction which is a width direction, and spaces formed between the projections in the second direction.Type: ApplicationFiled: May 26, 2015Publication date: March 15, 2018Applicant: Mitsubishi Electric CorporationInventors: Hiroshi WAKAYAMA, Eigo TOTOKI, Shinichi YAMAGUCHI, Kenta MOTOYOSHI, Yosuke TAKAISHI
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Patent number: 9912204Abstract: In conventional rotors having a shape in which permanent magnets are skewed, a configuration in which, for example, the thicknesses of both ends of each magnet are increased is used in order to make the rotors symmetric between the forward and reverse directions, thereby causing excessive increase in the thicknesses. In a rotor 2 in which permanent magnets form magnet poles and the permanent magnets are skewed with respect to the axial direction, the thickness of each permanent magnet is increased at a portion that is most likely to be demagnetized, that is, a positive side portion F in a rotor part 2A skewed in the positive direction and a negative side portion F in a rotor part 2B skewed in the negative direction, whereby a demagnetization resistance strengthened portion is formed.Type: GrantFiled: December 9, 2013Date of Patent: March 6, 2018Assignee: Mitsubishi Electric CorporationInventors: Eigo Totoki, Toshinori Tanaka, Tomoya Tachibana
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Patent number: 9716411Abstract: A rotor core includes low permeability areas having lower permeability than that of a material of the rotor core, between an outer circumference of each magnetic pole and a side surface of each permanent magnet. The low permeability areas are formed asymmetrically with respect to a geometric center of each magnetic pole so that a magnetic center of the magnetic pole is displaced toward one side with respect to the geometric center. The rotor cores are placed upside down relative to each other so that a relative position in the circumferential direction of the low permeability areas with respect to the permanent magnets differs.Type: GrantFiled: December 9, 2013Date of Patent: July 25, 2017Assignee: Mitsubishi Electric CorporationInventors: Toshinori Tanaka, Tomoya Tachibana, Eigo Totoki
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Patent number: 9705366Abstract: R1>R2>R3 is satisfied, where R1 is a radius of curvature of a cylindrical surface that contacts circular arc-shaped curved surfaces arranged circumferentially, R2 is a radius of curvature of the circular arc-shaped curved surfaces, and R3 is a radius of curvature of an upper surface of permanent magnets, air gaps are formed on radially outer portions of two circumferential side portions of magnet housing apertures, surfaces that contact two circumferential side surfaces of the permanent magnets so as to be parallel to a radial direction are disposed on radially inner portions of the two circumferential end portions, and B2>B1 is satisfied, where B1 is a thickness of a core portion of the rotor core between the circular arc-shaped curved surfaces and the magnet housing apertures at a magnetic pole center, and B2 is a thickness of a circumferential end portion of the core portion.Type: GrantFiled: February 24, 2015Date of Patent: July 11, 2017Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Toshinori Tanaka, Eigo Totoki, Ryuichi Takiguchi
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Publication number: 20170085143Abstract: R1>R2>R3 is satisfied, where R1 is a radius of curvature of a cylindrical surface that contacts circular arc-shaped curved surfaces arranged circumferentially, R2 is a radius of curvature of the circular arc-shaped curved surfaces, and R3 is a radius of curvature of an upper surface of permanent magnets, air gaps are formed on radially outer portions of two circumferential side portions of magnet housing apertures, surfaces that contact two circumferential side surfaces of the permanent magnets so as to be parallel to a radial direction are disposed on radially inner portions of the two circumferential end portions, and B2>B1 is satisfied, where B1 is a thickness of a core portion of the rotor core between the circular arc-shaped curved surfaces and the magnet housing apertures at a magnetic pole center, and B2 is a thickness of a circumferential end portion of the core portion.Type: ApplicationFiled: February 24, 2015Publication date: March 23, 2017Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Toshinori TANAKA, Eigo TOTOKI, Ryuichi TAKIGUCHI
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Publication number: 20170019041Abstract: A control device converts phase currents supplied to a permanent-magnet rotary motor into a d-axis current and a q-axis current on a dq coordinate axis, and calculates a current command (a d-axis current command or a q-axis current command) for changing at least one of values of the d-axis current and the q-axis current according to a rotor position, based on a torque command, the d-axis current and the q-axis current, so as to cause a magnitude of a reverse magnetic field acting on a permanent-magnet end part to be equal to or lower than a magnetic coercive force of a permanent magnet.Type: ApplicationFiled: February 28, 2014Publication date: January 19, 2017Applicant: Mitsubishi Electric CorporationInventors: Makoto SUGIYAMA, Koki NAKA, Hisashi OTSUKA, Shinichi YAMAGUCHI, Eigo TOTOKI
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Patent number: 9537380Abstract: A permanent-magnet type rotating electrical machine, including a rotor including a plurality of magnetic poles arranged at an equal interval, and a stator including a plurality of teeth and a plurality of armature windings. A high frequency voltage different in frequency and amplitude from voltages for generating a torque is applied to the armature windings. A magnetic pole position of the rotor is estimated by using a current trajectory of a measured high frequency current. When dq transform is applied to the measured high frequency current, a current trajectory forms an ellipse on d and q axes. Angular variation ranges of a major axis of the ellipse with respect to a load current and a rotor position are set so as to acquire a predetermined position estimation resolution.Type: GrantFiled: January 18, 2012Date of Patent: January 3, 2017Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Shinichi Yamaguchi, Eigo Totoki, Masato Ito, Daisuke Nishijima, Toshinori Tanaka
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Publication number: 20150270752Abstract: A rotor core includes low permeability areas having lower permeability than that of a material of the rotor core, between an outer circumference of each magnetic pole and a side surface of each permanent magnet. The low permeability areas are formed asymmetrically with respect to a geometric center of each magnetic pole so that a magnetic center of the magnetic pole is displaced toward one side with respect to the geometric center. The rotor cores are placed upside down relative to each other so that a relative position in the circumferential direction of the low permeability areas with respect to the permanent magnets differs.Type: ApplicationFiled: December 9, 2013Publication date: September 24, 2015Applicant: Mitsubishi Electric CorporationInventors: Toshinori Tanaka, Tomoya Tachibana, Eigo Totoki
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Publication number: 20150270750Abstract: In conventional rotors having a shape in which permanent magnets are skewed, a configuration in which, for example, the thicknesses of both ends of each magnet are increased is used in order to make the rotors symmetric between the forward and reverse directions, thereby causing excessive increase in the thicknesses. In a rotor 2 in which permanent magnets form magnet poles and the permanent magnets are skewed with respect to the axial direction, the thickness of each permanent magnet is increased at a portion that is most likely to be demagnetized, that is, a positive side portion F in a rotor part 2A skewed in the positive direction and a negative side portion F in a rotor part 2B skewed in the negative direction, whereby a demagnetization resistance strengthened portion is formed.Type: ApplicationFiled: December 9, 2013Publication date: September 24, 2015Applicant: Mitsubishi Electric CorporationInventors: Eigo Totoki, Toshinori Tanaka, Tomoya Tachibana
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Publication number: 20140001908Abstract: A permanent-magnet type rotating electrical machine, including a rotor including a plurality of magnetic poles arranged at an equal interval, and a stator including a plurality of teeth and a plurality of armature windings. A high frequency voltage different in frequency and amplitude from voltages for generating a torque is applied to the armature windings. A magnetic pole position of the rotor is estimated by using a current trajectory of a measured high frequency current. When dq transform is applied to the measured high frequency current, a current trajectory forms an ellipse on d and q axes. Angular variation ranges of a major axis of the ellipse with respect to a load current and a rotor position are set so as to acquire a predetermined position estimation resolution.Type: ApplicationFiled: January 18, 2012Publication date: January 2, 2014Applicant: Mitsubishi Electric CorporationInventors: Shinichi Yamaguchi, Eigo Totoki, Masato Ito, Daisuke Nishijima, Toshinori Tanaka