Patents by Inventor Makoto Taniguchi

Makoto Taniguchi 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: 11356047
    Abstract: A motor control apparatus includes: a high-pole-number controller that generates a voltage command for high-pole-number drive of an electric motor and controls operation of the electric motor under the high-pole-number drive; a low-pole-number controller that generates a voltage command for low-pole-number drive of the electric motor and controls operation of the electric motor under the low-pole-number drive; and a priority pole-number determiner that determines which one of the high-pole-number drive and the low-pole-number drive is to be given priority during switching between the high-pole-number and low-pole-number drives.
    Type: Grant
    Filed: October 27, 2020
    Date of Patent: June 7, 2022
    Assignee: DENSO CORPORATION
    Inventors: Jun Ishida, Makoto Taniguchi
  • Patent number: 11323009
    Abstract: A rotating electric machine unit includes a rotating electric machine, a high heat generation circuit and a low heat generation circuit both of which are electrically connected with the rotating electric machine, a first cooler, a first-coolant supplier, a second cooler and a second-coolant supplier. The first cooler is configured to cool both the high heat generation circuit and the low heat generation circuit with a first coolant. The first-coolant supplier is configured to supply the first coolant to the first cooler. The second cooler is configured to cool the rotating electric machine with a second coolant. The second-coolant supplier is configured to supply the second coolant to the second cooler. The second-coolant supplier is formed integrally with a low heat generation circuit-cooling part of the first cooler. The second-coolant supplier includes a heat exchanger via which heat is exchanged between the first coolant and the second coolant.
    Type: Grant
    Filed: March 29, 2019
    Date of Patent: May 3, 2022
    Assignee: DENSO CORPORATION
    Inventors: Ryotaro Okamoto, Hirofumi Kinjo, Makoto Taniguchi
  • Publication number: 20220045578
    Abstract: A rotating electrical machine includes a rotor and a magnet unit. The rotating electrical machine also includes a cylindrical stator and a housing. The stator is equipped with a stator winding made up of a plurality of phase windings. The stator is arranged coaxially with the rotor and faces the rotor. The housing has the rotor and the stator disposed therein. The rotor includes a cylindrical magnet retainer to which the magnet unit is secured and an intermediate portion which connects between a rotating shaft of the rotor and the magnet retainer and extends in a radial direction of the rotating shaft. A first region located radially inside an inner peripheral surface of a magnetic circuit component made up of the stator and the rotor is greater in volume than a second region between the inner peripheral surface of the magnetic circuit component and the housing in the radial direction.
    Type: Application
    Filed: September 22, 2021
    Publication date: February 10, 2022
    Applicant: DENSO CORPORATION
    Inventors: Yuki TAKAHASHI, Makoto TANIGUCHI
  • Patent number: 11228270
    Abstract: A drive apparatus is provided for driving a multi-phase rotating electric machine. The rotating electric machine includes a plurality of winding groups for respective phases. The drive apparatus includes a first inverter connected with start terminals of the winding groups of the rotating electric machine, a second inverter connected with intermediate terminals of the winding groups, and an energization controller configured to selectively perform energization of the winding groups by the first inverter and energization of the winding groups by the second inverter. Each of the first and second inverters includes a plurality of switch pairs respectively corresponding to the winding groups and each consisting of an upper-arm switch and a lower-arm switch that are connected in series with each other. Moreover, each of the upper-arm and lower-arm switches of the first inverter is configured to have bidirectionally-conducting and bidirectionally-blocking functions.
    Type: Grant
    Filed: August 5, 2020
    Date of Patent: January 18, 2022
    Assignee: DENSO CORPORATION
    Inventors: Hirofumi Kinjo, Yuji Ito, Makoto Taniguchi
  • Publication number: 20220014074
    Abstract: A rotating electrical machine includes a rotor and a magnet unit. The rotating electrical machine also includes a cylindrical stator and a housing. The stator is equipped with a stator winding made up of a plurality of phase windings. The stator is arranged coaxially with the rotor and faces the rotor. The housing has the rotor and the stator disposed therein. The rotor includes a cylindrical magnet retainer to which the magnet unit is secured and an intermediate portion which connects between a rotating shaft of the rotor and the magnet retainer and extends in a radial direction of the rotating shaft. A first region located radially inside an inner peripheral surface of a magnetic circuit component made up of the stator and the rotor is greater in volume than a second region between the inner peripheral surface of the magnetic circuit component and the housing in the radial direction.
    Type: Application
    Filed: September 22, 2021
    Publication date: January 13, 2022
    Applicant: DENSO CORPORATION
    Inventors: Yuki TAKAHASHI, Makoto TANIGUCHI
  • Publication number: 20220014075
    Abstract: A rotating electrical machine includes a rotor and a magnet unit. The rotating electrical machine also includes a cylindrical stator and a housing. The stator is equipped with a stator winding made up of a plurality of phase windings. The stator is arranged coaxially with the rotor and faces the rotor. The housing has the rotor and the stator disposed therein. The rotor includes a cylindrical magnet retainer to which the magnet unit is secured and an intermediate portion which connects between a rotating shaft of the rotor and the magnet retainer and extends in a radial direction of the rotating shaft. A first region located radially inside an inner peripheral surface of a magnetic circuit component made up of the stator and the rotor is greater in volume than a second region between the inner peripheral surface of the magnetic circuit component and the housing in the radial direction.
    Type: Application
    Filed: September 22, 2021
    Publication date: January 13, 2022
    Applicant: DENSO CORPORATION
    Inventors: Yuki TAKAHASHI, Makoto TANIGUCHI
  • Patent number: 11223311
    Abstract: In a rotary electric machine, a rotor, and a stator. The stator includes slots provided in a circumferential direction thereof, and stator windings wound in the slots. The stator windings include n groups of three-phase windings, where n is a power of 2. The slots include first slots each accommodating portions of same-group and same-phase windings in the n groups of three-phase windings. The energizing directions of the same-group and same-phase windings are identical to each other. The second slots each accommodate different-group and same-phase windings in the n groups of three-phase windings. The first slots and the second slots are arranged in the stator at predetermined intervals in a circumferential direction of the stator, and the three-phase windings of each group are wound around the stator with regular intervals therebetween.
    Type: Grant
    Filed: October 10, 2019
    Date of Patent: January 11, 2022
    Assignee: DENSO CORPORATION
    Inventors: Hirofumi Kinjo, Toru Wakimoto, Makoto Taniguchi, Keiji Kondo, Jun Ishida, Tomoya Takahashi
  • Publication number: 20220006358
    Abstract: A rotating electrical machine includes a rotor and a magnet unit. The rotating electrical machine also includes a cylindrical stator and a housing. The stator is equipped with a stator winding made up of a plurality of phase windings. The stator is arranged coaxially with the rotor and faces the rotor. The housing has the rotor and the stator disposed therein. The rotor includes a cylindrical magnet retainer to which the magnet unit is secured and an intermediate portion which connects between a rotating shaft of the rotor and the magnet retainer and extends in a radial direction of the rotating shaft. A first region located radially inside an inner peripheral surface of a magnetic circuit component made up of the stator and the rotor is greater in volume than a second region between the inner peripheral surface of the magnetic circuit component and the housing in the radial direction.
    Type: Application
    Filed: September 22, 2021
    Publication date: January 6, 2022
    Applicant: DENSO CORPORATION
    Inventors: Yuki TAKAHASHI, Makoto TANIGUCHI
  • Publication number: 20220006357
    Abstract: A rotating electrical machine includes a rotor and a magnet unit. The rotating electrical machine also includes a cylindrical stator and a housing. The stator is equipped with a stator winding made up of a plurality of phase windings. The stator is arranged coaxially with the rotor and faces the rotor. The housing has the rotor and the stator disposed therein. The rotor includes a cylindrical magnet retainer to which the magnet unit is secured and an intermediate portion which connects between a rotating shaft of the rotor and the magnet retainer and extends in a radial direction of the rotating shaft. A first region located radially inside an inner peripheral surface of a magnetic circuit component made up of the stator and the rotor is greater in volume than a second region between the inner peripheral surface of the magnetic circuit component and the housing in the radial direction.
    Type: Application
    Filed: September 22, 2021
    Publication date: January 6, 2022
    Applicant: DENSO CORPORATION
    Inventors: Yuki TAKAHASHI, Makoto TANIGUCHI
  • Publication number: 20220006356
    Abstract: A rotating electrical machine includes a rotor and a magnet unit. The rotating electrical machine also includes a cylindrical stator and a housing. The stator is equipped with a stator winding made up of a plurality of phase windings. The stator is arranged coaxially with the rotor and faces the rotor. The housing has the rotor and the stator disposed therein. The rotor includes a cylindrical magnet retainer to which the magnet unit is secured and an intermediate portion which connects between a rotating shaft of the rotor and the magnet retainer and extends in a radial direction of the rotating shaft. A first region located radially inside an inner peripheral surface of a magnetic circuit component made up of the stator and the rotor is greater in volume than a second region between the inner peripheral surface of the magnetic circuit component and the housing in the radial direction.
    Type: Application
    Filed: September 22, 2021
    Publication date: January 6, 2022
    Applicant: DENSO CORPORATION
    Inventors: Yuki TAKAHASHI, Makoto TANIGUCHI
  • Patent number: 11196315
    Abstract: A drive apparatus is provided for driving a rotating electric machine having first and second multi-phase coils. The drive apparatus includes first and second inverters, first and second shift switches, and first and second energization controllers. The first energization controller is configured to turn on and off, for each of phase windings of the first and second multi-phase coils, one corresponding pair of upper-arm and lower-arm switches of the first and second inverters while keeping the first and second shift switches in an OFF state. The second energization controller is configured to turn on and off, for each corresponding pair of the phase windings of the first and second multi-phase coils, one corresponding upper-arm switch of the first inverter and one corresponding lower-arm switch of the second inverter respectively for first energization periods and second energization periods that are alternately set while keeping the shift switches in an ON state.
    Type: Grant
    Filed: August 10, 2020
    Date of Patent: December 7, 2021
    Assignee: DENSO CORPORATION
    Inventors: Hirofumi Kinjo, Makoto Taniguchi
  • Patent number: 11196372
    Abstract: A control apparatus for a rotating electric machine is applied to a rotating electric machine system. The rotating electric machine system includes a rotating electric machine having a multiple-phase winding, a first inverter connected to a first end of the winding for each phase, a second inverter connected to a second end of the winding for each phase, a high-potential-side connection line, and a low-potential-side connection line. The control apparatus acquires a parameter that has a correlation with a fundamental current that flows to the winding of each phase. The control apparatus stores, in a storage unit, correspondence information in which the parameter is associated with an amplitude and a phase of a harmonic voltage that is generated in the rotating electric machine. The control apparatus controls each of the first inverter and the second inverter to suppress the harmonic voltage based on the correspondence information and the acquired parameter.
    Type: Grant
    Filed: May 14, 2020
    Date of Patent: December 7, 2021
    Assignee: DENSO CORPORATION
    Inventors: Hirofumi Kinjo, Makoto Taniguchi
  • Patent number: 11152883
    Abstract: A control device for a pole-number switching electric motor applied to a system including an electric motor capable of switching a number of poles, and an inverter electrically connected to stator windings of the electric motor; includes: a basic operation unit configured to operate the inverter to control a current amplitude which is magnitude of a current vector flowing in the stator winding, and a switching operation unit configured to operate the inverter to reduce the current amplitude before switching and increase the current amplitude after switching. The switching operation unit, the pole number switching period, operates the inverter so that a total value of the current amplitude before switching and the current amplitude after switching does not exceed a limiting current value.
    Type: Grant
    Filed: August 19, 2020
    Date of Patent: October 19, 2021
    Assignee: DENSO CORPORATION
    Inventors: Jun Ishida, Makoto Taniguchi
  • Publication number: 20210319410
    Abstract: A vehicle management system that manages vehicles allocated to multiple allocation areas is configured to execute an obtaining process that obtains vehicle information including traveling tendencies of the vehicles, a calculation process that calculates degrees of deterioration of components of the vehicles based on the obtained vehicle information, and a reallocation process that changes the allocation area of a vehicle of which the degree of deterioration of a component is greater than or equal to a preset value to an allocation area that has a vehicle of which the degree of deterioration of the same component is less than the preset value.
    Type: Application
    Filed: February 26, 2021
    Publication date: October 14, 2021
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Makoto TANIGUCHI
  • Publication number: 20210313912
    Abstract: An electric motor system includes a battery, an inverter, an electric motor, a zero-phase switching arm and a control unit. The inverter converts DC power output from the battery into three-phase AC power and outputs the three-phase AC power to the electric motor. A rotor of the electric motor rotates by the three-phase AC power output from the inverter. A neural point of the electric motor is connected to the zero-phase switching arm. A zero-phase current flowing through respective windings of the electric motor is adjusted by switching of the zero-phase switching arm. By this means, in the electric motor system, torque is generated at the rotor also using the zero-phase current as well as a three-phase AC current flowing through the respective windings.
    Type: Application
    Filed: June 21, 2021
    Publication date: October 7, 2021
    Applicant: DENSO CORPORATION
    Inventors: Makoto TANIGUCHI, Kazunari MORIYA, Kenji HIRAMOTO, Hideo NAKAI, Yuuko OHTANI, Shinya URATA, Masafumi NAMBA
  • Patent number: 11133733
    Abstract: A rotary electrical machine includes a switch for supplying power to a field winding and controller. A ratio of an on-time to one switching cycle of the switch is defined as a duty ratio, and a duty ratio which is larger than the duty ratio corresponding to the field current that gives the maximum reduction amount of the inductance of the field winding with respect to an increasing amount of the field current in a range that the current can take and has a value less than 100% is set as a predetermined value. The controller calculates the duty ratio wherein an upper limit of the ratio is the predetermined value and turns on/off the switch based on the calculated duty ratio. Also, a relay and abnormality detection part that detects abnormality in the switch. The relay is switched to off in response to the occurrence of abnormality being detected.
    Type: Grant
    Filed: January 21, 2020
    Date of Patent: September 28, 2021
    Assignee: DENSO CORPORATION
    Inventors: Yuki Takahashi, Makoto Taniguchi
  • Publication number: 20210297006
    Abstract: In a power converter for converting DC power from a DC power source into AC power and supplying the AC power to a single-phase winding or multi-phase windings, a controller controls first and second inverter circuits and performs first power conversion control to lock open/closed states of switching elements in the second inverter circuit and switch open/closed states of switching elements in the first inverter circuit, and second power conversion control to lock open/closed states of the switching elements in the first inverter circuit and switch open/closed states of the switching elements in the second inverter circuit. The controller is configured to perform either the first power conversion control or the second power conversion control when an effective value of drive current through each winding is less than a threshold, and otherwise switch between the first power conversion control and the second power conversion control.
    Type: Application
    Filed: June 4, 2021
    Publication date: September 23, 2021
    Applicant: DENSO CORPORATION
    Inventors: Yoshimitsu TAKAHASHI, Makoto TANIGUCHI
  • Publication number: 20210265937
    Abstract: A drive system includes: first and second inverters; a high-potential-side connection line; a low-potential-side connection line; a first changeover switch provided to at least one of the high-potential-side and low-potential side connection lines; a second changeover switch connected in parallel to the first changeover switch; a mode control section changing between a first mode in which to perform switching driving of upper and lower arm switches in one of the inverters and perform neutral point driving of at least one of the upper and lower arm switches in the other inverter to maintain in an on state and a second mode in which to perform switching driving of the upper and lower arm switches in both the inverters; and a changeover control section that, at the time of a changeover between the first and second modes, changes the first and second changeover switches between the on and off states.
    Type: Application
    Filed: May 10, 2021
    Publication date: August 26, 2021
    Applicant: DENSO CORPORATION
    Inventors: Takashi KASHIWAZAKI, Makoto TANIGUCHI
  • Publication number: 20210257953
    Abstract: A drive system for a rotating electric machine system includes: a first inverter and a second inverter connected to first and second ends of multi-phase windings respectively; a selection unit performing selection between a first setting representing that the first inverter is set to a switch drive inverter and the second inverter is set to a neutral-point drive inverter and a second setting representing that the second inverter is set to the switch drive inverter and the first inverter is set to the neutral-point drive inverter; and a drive control unit performing a switch drive task of performing on-off driving of the upper and lower arm switches of the switch drive inverter to thereby input/output power to/from the rotating electrical machine; and a neutral-point drive task of maintaining at least one of the upper and lower arm switches of the neural-point drive inverter in an on state.
    Type: Application
    Filed: May 3, 2021
    Publication date: August 19, 2021
    Applicant: DENSO CORPORATION
    Inventors: Takashi KASHIWAZAKI, Makoto TANIGUCHI
  • Publication number: 20210257947
    Abstract: In a driving device for a rotating electric machine, a first inverter unit blocks and allows, for each winding of multi-phase windings of the rotating electric machine, current conduction on one side of the winding and a second inverter unit blocks and allows current conduction on the other side of the winding. A plurality of second switching elements forming the second inverter unit each have a lower ON resistance than a plurality of first switching elements forming the first inverter unit. A controller is configured to switch on and off the respective first switching elements at a switching frequency higher than an electric fundamental frequency and switch on and off the respective second switching elements at a switching frequency lower than the switching frequency at which to switch on and off the first switching elements.
    Type: Application
    Filed: May 3, 2021
    Publication date: August 19, 2021
    Applicant: DENSO CORPORATION
    Inventors: Hirofumi KINJO, Makoto TANIGUCHI