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公开(公告)号：US11962228B2
公开(公告)日：2024-04-16
申请号：US17481494
申请日：2021-09-22
Applicant: DENSO CORPORATION
Inventor： Yuki Takahashi , Makoto Taniguchi
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.
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公开(公告)号：US11942875B2
公开(公告)日：2024-03-26
申请号：US17306245
申请日：2021-05-03
Applicant: DENSO CORPORATION
Inventor： Takashi Kashiwazaki , Makoto Taniguchi
CPC classification number: H02M7/5387 , H02M1/08 , H02M7/493 , H02M7/53871 , H02P27/08 , H02P29/68 , H02M1/0043
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.
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公开(公告)号：US11843334B2
公开(公告)日：2023-12-12
申请号：US16748535
申请日：2020-01-21
Applicant: DENSO CORPORATION
Inventor： Yuki Takahashi , Makoto Taniguchi
Abstract: A rotating electrical machine includes a magnetic field-producing unit, an armature with a multi-phase armature winding, and a rotor. The magnetic field-producing unit includes a first portion and a second portion. The first portion is located closer to a d-axis in a d-q axis coordinate system than the second position is. The second position is located closer to a q-axis in the d-q axis coordinate system than the first position is. The magnetic field-producing unit is magnetically oriented to meet a condition where an angle which an easy axis of magnetization of the first portion makes with the d-axis is smaller than an angle which an easy axis of magnetization of the second portion makes with the q-axis. The magnetic field-producing unit is configured to have an intrinsic coercive force of 400 kA/m and also have a remanent flux density of 1.0 T or more.
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公开(公告)号：US11757373B2
公开(公告)日：2023-09-12
申请号：US17339279
申请日：2021-06-04
Applicant: DENSO CORPORATION
Inventor： Yoshimitsu Takahashi , Makoto Taniguchi
CPC classification number: H02M7/53871 , H02M1/0048 , H02M1/088 , H02M3/158 , H02M7/493 , H02M7/537 , H02M1/0003 , H02M1/08
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.
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公开(公告)号：US11670988B2
公开(公告)日：2023-06-06
申请号：US17481494
申请日：2021-09-22
Applicant: DENSO CORPORATION
Inventor： Yuki Takahashi , Makoto Taniguchi
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.
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Patent Agency Ranking
公开(公告)号：US11652374B2
公开(公告)日：2023-05-16
申请号：US16701783
申请日：2019-12-03
Applicant: DENSO CORPORATION
Inventor： Makoto Taniguchi , Akira Fukushima , Ken Matsubara , Satoshi Doi
Abstract: A rotary electrical machine is equipped with a rotor that is rotatably supported, and a stator having a stator core that is disposed coaxially with the rotor. The stator core is configured as a plurality of stacked steel plates, and has a yoke portion that is of annular shape, a plurality of teeth extending radially from the yoke portion, and slots between adjacent teeth. A stator winding is wound in the slots. The yoke portion has holes that extend in the stacking direction of the steel plates, at positions of radial-direction extension of the slots, and molded powder bodies formed from a magnetic powder are provided within the holes.
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公开(公告)号：US11356047B2
公开(公告)日：2022-06-07
申请号：US17081339
申请日：2020-10-27
Applicant: DENSO CORPORATION
Inventor： Jun Ishida , Makoto Taniguchi
IPC: H02P25/20
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. Moreover, during the switching, of the high-pole-number and low-pole-number controllers, the controller corresponding to the drive given priority by the priority pole-number determiner calculates the voltage command for the drive given priority; and the controller corresponding to the drive not given priority calculates, based on the voltage command for the drive given priority, the voltage command for the drive not given priority.
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公开(公告)号：US11196315B2
公开(公告)日：2021-12-07
申请号：US16989641
申请日：2020-08-10
Applicant: DENSO CORPORATION
Inventor： Hirofumi Kinjo , Makoto Taniguchi
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.
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公开(公告)号：US11152883B2
公开(公告)日：2021-10-19
申请号：US16997393
申请日：2020-08-19
Applicant: DENSO CORPORATION
Inventor： Jun Ishida , Makoto Taniguchi
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.
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公开(公告)号：US11038456B2
公开(公告)日：2021-06-15
申请号：US16722599
申请日：2019-12-20
Applicant: DENSO CORPORATION
Inventor： Jun Ishida , Makoto Taniguchi
Abstract: A control apparatus is provided to control a rotating electric machine whose number of poles is switched from a pre-switching number of poles to a post-switching number of poles. The control apparatus includes a pre-switching control unit, a post-switching control unit and a transition control unit. The pre-switching control unit controls the torque generated by the machine before the switching of the number of poles. The post-switching control unit controls the torque generated by the machine after the switching. During a pole-number switching period, the transition control unit controls electric currents flowing in stator coils of the machine or voltages applied to the stator coils to make each magnetic pole formed with control by the pre-switching control unit not coincident with any magnetic pole formed with control by the post-switching control unit and having the same polarity as the magnetic pole formed with the control by the pre-switching control unit.
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