Patents by Inventor Hideo Nakai
Hideo Nakai 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: 8680801Abstract: A rotating electrical machine system includes a stator that has stator windings of a plurality of phases, and that generates a stator magnetomotive force in accordance with stator current of different phases, which is supplied to the stator windings of the plurality of phases; a rotor on which rotor windings are wound such that rotor current is generated in accordance with the stator magnetomotive force generated by the stator and a magnetic pole is formed by the rotor current; and a control unit that controls an output torque from the rotor, by controlling the stator current. In a case where a predetermined torque is output from the rotor, the control unit applies a pulse to the stator current so as to increase the stator current and reduce the rotor current, when a temperature of the rotor is high as compared with when the temperature of the rotor is low.Type: GrantFiled: March 23, 2012Date of Patent: March 25, 2014Assignee: Toyota Jidosha Kabushiki KaishaInventors: Eiji Yamada, Kenji Hiramoto, Hideo Nakai, Norimoto Minoshima
-
Publication number: 20140028160Abstract: A stator has a stator core, and stator windings wound around either the stator core or teeth of the stator. A rotor has a rotor core, windings wound around either the rotor core or teeth of the rotor, and magnetic auxiliary poles disposed between the teeth adjacent in a circumferential direction. The rotor further has diodes that are magnetic characteristic adjustment portions that cause the magnetic characteristic that occurs in the teeth by induced electromotive force produced in the rotor windings to vary in the circumferential direction of the rotor core.Type: ApplicationFiled: April 4, 2012Publication date: January 30, 2014Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Eiji Yamada, Ryoji Mizutani, Kenji Hiramoto, Hideo Nakai, Norimoto Minoshima
-
Publication number: 20130334937Abstract: A stator has multi-phase stator coils that are wound around a stator core by concentrated winding. A rotor has rotor coils that are wound at multiple portions of a rotor core in the circumferential direction and diodes that serve as rectifier unit that is connected to the rotor coils and that varies the magnetic characteristics of the respective rotor coils alternately in the circumferential direction. A rotary electric machine driving system includes a decreasing pulse superimposing unit that superimposes decreasing pulse current for a pulse-shaped decrease on a q-axis current command for passing currents through the stator coils.Type: ApplicationFiled: February 14, 2012Publication date: December 19, 2013Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Eiji Yamada, Ryoji Mizutani, Kenji Hiramoto, Hideo Nakai, Norimoto Minoshima
-
Publication number: 20130314021Abstract: A stator has multi-phase stator coils that are wound around a stator core by concentrated winding. A rotor has rotor coils that are wound at multiple portions of a rotor core in the circumferential direction and diodes that serve as rectifier unit that is connected to the rotor coils and that varies the magnetic characteristics of the respective rotor coils alternately in the circumferential direction. A rotary electric machine driving system includes a decreasing/increasing pulse superimposing unit that superimposes decreasing pulse current for a pulse-shaped decrease on a q-axis current command for passing currents through the stator coils and that superimposes increasing pulse current for a pulse-shaped increase on a d-axis current command.Type: ApplicationFiled: February 14, 2012Publication date: November 28, 2013Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Eiji Yamada, Ryoji Mizutani, Kenji Hiramoto, Hideo Nakai, Norimoto Minoshima
-
Publication number: 20130134823Abstract: A rotor includes a plurality of salient poles, each of which is formed by a plurality of plate members including steel plates that are stacked together, provided extending in a radial direction and around which a coil is wound. The plurality of salient poles has auxiliary salient poles that protrude from the salient poles between two salient poles that are adjacent to one another. The auxiliary salient poles are formed by only a first plate member that is a portion of plate members that forms the salient poles.Type: ApplicationFiled: November 28, 2012Publication date: May 30, 2013Inventors: Eiji Yamada, Ryoji Mizutani, Shintaro Chinen, Kenji Hiramoto, Hideo Nakai
-
Publication number: 20120313492Abstract: A stator that includes stator windings wound around teeth. A rotor includes: a rotor core; rotor windings wound around main salient poles of the rotor; and a diode serving as a magnetic characteristic adjustment portion that causes magnetic characteristics produced on the main salient poles by electromotive forces induced in the rotor windings to differ in the circumferential direction of the rotor. The rotor has auxiliary salient poles that are each protruded from a side surface of each main salient pole in the circumferential direction. In each of rotor slots formed between the main salient poles adjacent to each other in the circumferential direction, the auxiliary salient poles adjacent to each other in the circumferential direction are connected to each other within the rotor slot. In each rotor slot, at least a portion of the rotor windings is disposed radially inside the auxiliary salient poles.Type: ApplicationFiled: June 12, 2012Publication date: December 13, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Eiji YAMADA, Ryoji MIZUTANI, Shintaro CHINEN, Kenji HIRAMOTO, Hideo NAKAI
-
Patent number: 8330409Abstract: An inverter is capable of converting a direct current from a direct current power supply into an alternating current and supplying it to an armature winding. A rectifier circuit is capable of rectifying the current, that has been converted to an alternating current by the inverter, into a direct current and supplying it to the field winding. The amount of the alternating current supplied to the armature winding and the amount of the direct current supplied to the field winding are in a proportional relationship, and implementation of switching control of the inverter controls both the amount of the alternating current supplied to the armature winding and the amount of the direct current supplied to the field winding while this proportional relationship therebetween is maintained.Type: GrantFiled: March 11, 2010Date of Patent: December 11, 2012Assignee: Kabushiki Kaisha Toyota Chuo KenkyushoInventors: Kenji Hiramoto, Hideo Nakai
-
Patent number: 8294322Abstract: In a rotating electrical machine, when a stator winding is wound in concentrated winding, an improvement in performance is achieved by reducing a magnetomotive force harmonic without reducing a fundamental wave magnetic flux generated by a stator. A rotating electrical machine (10) includes a rotor (18), and two stators (14, 16) opposed with the rotor (18) being interposed therebetween either on both sides of the rotor (18) in the axial direction or on both sides of the rotor (18) in the radial direction. Stator windings (22) provided in a plurality of portions in the circumferential direction of each stator (14, 16) are wound in concentrated winding. The directions of magnetic fluxes generated by stator windings (22) having the same phase in the stators (14, 16) are in mutually opposite directions with respect to either the axial direction or the radial direction.Type: GrantFiled: March 12, 2009Date of Patent: October 23, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Kosuke Aiki, Hideo Nakai, Takaji Umeno, Eiji Yamada, Kazutaka Tatematsu, Norimoto Minoshima, Toshihiko Yoshida, Tatsuya Uematsu, Kenji Endo
-
Publication number: 20120256510Abstract: A rotary electric machine includes a stator that creates a rotating magnetic field, and a rotor around which a rotor winding is wound so that induced electromotive force is created by a harmonic component of the rotating magnetic field, and in which a magnetic pole is created through the induced electromotive force. The stator has an auxiliary pole that is a leading portion that leads the harmonic component from the stator to the rotor.Type: ApplicationFiled: April 4, 2012Publication date: October 11, 2012Applicants: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Eiji YAMADA, Ryoji MIZUTANI, Shintaro CHINEN, Kenji HIRAMOTO, Hideo NAKAI, Norimoto MINOSHIMA
-
Publication number: 20120242272Abstract: A rotating electrical machine system includes a stator that has stator windings of a plurality of phases, and that generates a stator magnetomotive force in accordance with stator current of different phases, which is supplied to the stator windings of the plurality of phases; a rotor on which rotor windings are wound such that rotor current is generated in accordance with the stator magnetomotive force generated by the stator and a magnetic pole is formed by the rotor current; and a control unit that controls an output torque from the rotor, by controlling the stator current. In a case where a predetermined torque is output from the rotor, the control unit applies a pulse to the stator current so as to increase the stator current and reduce the rotor current, when a temperature of the rotor is high as compared with when the temperature of the rotor is low.Type: ApplicationFiled: March 23, 2012Publication date: September 27, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Eiji Yamada, Kenji Hiramoto, Hideo Nakai, Norimoto Minoshima
-
Publication number: 20120235621Abstract: A rotary electric machine system includes: a stator that has multi-phase stator coils and that generates stator magnetomotive forces based on respective stator currents having different phases supplied to the multi-phase stator coils; a rotor on which rotor coils are wound such that magnetic poles are formed by rotor currents generated in response to the stator magnetomotive forces generated by the stator; a regulating unit that regulates a flow direction of each of the rotor currents to one direction to thereby regulate a polarity of each of the magnetic poles; and a control unit that controls currents supplied to the stator coils on the basis of a target torque. The control unit superimposes a pulse on the stator currents to adjust the ratio of each of the stator currents and each of the rotor currents so as to minimize a copper loss in the stator and the rotor.Type: ApplicationFiled: March 16, 2012Publication date: September 20, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Eiji Yamada, Kenji Hiramoto, Hideo Nakai, Norimoto Minoshima
-
Patent number: 8169199Abstract: It is determined that a periodic zero current stagnation state is reached to correct a voltage command of a smoothing capacitor downward by a predetermined voltage when a state where a current (reactor current) flowing through a coil in a dead time when switching elements are both off immediately after the switching element (upper arm) is turned off from on stagnates at a value of 0 occurs at switching periods of the switching elements. This can prevent a voltage of the smoothing capacitor from becoming unexpectedly higher than the voltage command in the current stagnation state, prevent the smoothing capacitor from being damaged by an overvoltage and prevent excessive torque from being output from motors.Type: GrantFiled: May 22, 2007Date of Patent: May 1, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Masaki Okamura, Kiyotaka Matsubara, Shungo Tamura, Hiroki Ohtani, Hideo Nakai
-
Publication number: 20110190970Abstract: A structure for controlling an engine is simplified in a power generation device equipped on a vehicle which generates power by a driving force of an engine. An operation unit (32) outputs to a controller (12) drive operation information based on an operation of a user. The controller (12) controls a vehicle driving circuit (28) and determines an engine output power target value based on the drive operation information and a running state of the vehicle. An engine output power/control voltage table stored in a storage unit (34) is referred to, and a value of a control voltage (Va) correlated to the engine output power target value is determined. The controller (12) controls a voltage adjusting circuit (24) such that the control voltage (Va) is set to the value determined based on the engine output power/control voltage table.Type: ApplicationFiled: January 11, 2011Publication date: August 4, 2011Applicants: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kazunari MORIYA, Hideo NAKAI, Yuichi OHTERU, Eiji YAMADA, Makoto HIRAI, Toru ANDO, Ryoji MIZUTANI, Kenji KIMURA, Mitsumasa FUKUMURA, Hidehiro OBA
-
Publication number: 20110025158Abstract: In a rotating electrical machine, when a stator winding is wound in concentrated winding, an improvement in performance is achieved by reducing a magnetomotive force harmonic without reducing a fundamental wave magnetic flux generated by a stator. A rotating electrical machine (10) includes a rotor (18), and two stators (14, 16) opposed with the rotor (18) being interposed therebetween either on both sides of the rotor (18) in the axial direction or on both sides of the rotor (18) in the radial direction. Stator windings (22) provided in a plurality of portions in the circumferential direction of each stator (14, 16) are wound in concentrated winding. The directions of magnetic fluxes generated by stator windings (22) having the same phase in the stators (14, 16) are in mutually opposite directions with respect to either the axial direction or the radial direction.Type: ApplicationFiled: March 12, 2009Publication date: February 3, 2011Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kosuke Aiki, Hideo Nakai, Takaji Umeno, Eiji Yamada, Kazutaka Tatematsu, Norimoto Minoshima, Toshihiko Yoshida, Tatsuya Uematsu, Kenji Endo
-
Patent number: 7836861Abstract: A variable valve mechanism for an internal combustion engine includes a rocker arm, a swing cam, and a transmission member which is interposed between the swing cam and a cam and transmits the displacement of the cam to the swing cam. The rocker arm is provided with a rolling roller member which includes a inner ring, an outer ring, and a plurality of rolling elements accommodated between the inner ring and the outer ring. The outer ring contacts with the swing cam. At least one of a first transmission part, in which the displacement of the cam is transmitted from the cam to the transmission member, and a second transmission part, in which the displacement of the cam is transmitted from the transmission member to the swing cam, includes a sliding roller member, wherein a sliding bearing mechanism is constituted between the sliding roller member and the support part.Type: GrantFiled: February 21, 2008Date of Patent: November 23, 2010Assignee: Mitsubishi Jidosha Kogyo Kabushiki KaishaInventors: Mikio Tanabe, Hideo Nakai, Satoshi Yoshikawa
-
Publication number: 20100259136Abstract: A plurality of salient poles projecting toward a stator are arranged on a rotor core along the circumferential direction while being spaced apart from each other, and rotor windings are wound around these salient poles. The rotor windings are short-circuited through diodes, respectively; and when currents rectified by the diodes flow through the rotor windings, the salient poles are magnetized to produce a magnet where the magnetic pole is fixed. The width ? of each salient pole in the circumferential direction is smaller than a width corresponding to an electric angle of 180° of the rotor, and the rotor windings are wound around each salient pole by short-pitch winding.Type: ApplicationFiled: October 17, 2008Publication date: October 14, 2010Applicants: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO, TOYOTA JIDOSHA KABUSHIKI KAISHA, KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, DENSO CORPORATIONInventors: Kenji Hiramoto, Hideo Nakai, Eiji Yamada, Norimoto Minoshima, Masahiro Seguchi
-
Publication number: 20100237822Abstract: An inverter is capable of converting a direct current from a direct current power supply into an alternating current and supplying it to an armature winding. A rectifier circuit is capable of rectifying the current, that has been converted to an alternating current by the inverter, into a direct current and supplying it to the field winding. The amount of the alternating current supplied to the armature winding and the amount of the direct current supplied to the field winding are in a proportional relationship, and implementation of switching control of the inverter controls both the amount of the alternating current supplied to the armature winding and the amount of the direct current supplied to the field winding while this proportional relationship therebetween is maintained.Type: ApplicationFiled: March 11, 2010Publication date: September 23, 2010Applicant: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHOInventors: Kenji Hiramoto, Hideo Nakai
-
Patent number: 7739987Abstract: The variable valve gear for an internal combustion engine includes a cam lobe that is rotatably supported by a cam drive shaft, and a variable valve mechanism that includes a drive arm fixed adjacent to one end of the cam lobe in the cam drive shaft, an eccentric shaft member that is swivelably supported at a position opposite to the cam lobe with respect to the drive arm in the cam drive shaft, has an outer circumferential surface eccentric to an axis of the cam drive shaft, and is adjustable in eccentricity, and an intermediate rotary member that is rotatably supported through a bearing member around the eccentric shaft member, and is connected to the drive arm, wherein the drive arm includes an end face that overlaps with an end face of the bearing member, when projecting along the axis of the cam drive shaft, and the end face of the drive arm is protruding further than the end face of the cam lobe toward the bearing member.Type: GrantFiled: November 24, 2008Date of Patent: June 22, 2010Assignees: Mitsubishi Jidosha Kogyo Kabushiki Kaisha, Mitsubishi Jidosha Engineering Kabushiki KaishaInventors: Jun Hoshikawa, Hirofumi Higashi, Akibiro Fujimoto, Noritsugu Ohsawa, Tetsuji Tatsumi, Tomoyuki Muraoka, Hideo Nakai
-
Publication number: 20090302818Abstract: It is determined that a periodic zero current stagnation state is reached to correct a voltage command of a smoothing capacitor downward by a predetermined voltage when a state where a current (reactor current) flowing through a coil in a dead time when switching elements are both off immediately after the switching element (upper arm) is turned off from on stagnates at a value of 0 occurs at switching periods of the switching elements. This can prevent a voltage of the smoothing capacitor from becoming unexpectedly higher than the voltage command in the current stagnation state, prevent the smoothing capacitor from being damaged by an overvoltage and prevent excessive torque from being output from motors.Type: ApplicationFiled: May 22, 2007Publication date: December 10, 2009Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Masaki Okamura, Kiyotaka Matsubara, Shungo Tamura, Hiroki Ohtani, Hideo Nakai
-
Publication number: 20090241877Abstract: The variable valve gear for an internal combustion engine includes a cam lobe that is rotatably supported by a cam drive shaft, and a variable valve mechanism that includes a drive arm fixed adjacent to one end of the cam lobe in the cam drive shaft, an eccentric shaft member that is swivelably supported at a position opposite to the cam lobe with respect to the drive arm in the cam drive shaft, has an outer circumferential surface eccentric to an axis of the cam drive shaft, and is adjustable in eccentricity, and an intermediate rotary member that is rotatably supported through a bearing member around the eccentric shaft member, and is connected to the drive arm, wherein the drive arm includes an end face that overlaps with an end face of the bearing member, when projecting along the axis of the cam drive shaft, and the end face of the drive arm is protruding further than the end face of the cam lobe toward the bearing member.Type: ApplicationFiled: November 24, 2008Publication date: October 1, 2009Inventors: Jun HOSHIKAWA, Hirofumi HIGASHI, Akibiro FUJIMOTO, Noritsugu OHSAWA, Tetsuji TATSUMI, Tomoyuki MURAOKA, Hideo NAKAI