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公开(公告)号：US20220006357A1
公开(公告)日：2022-01-06
申请号：US17481514
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：US20220006356A1
公开(公告)日：2022-01-06
申请号：US17481350
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：US20210313912A1
公开(公告)日：2021-10-07
申请号：US17352630
申请日：2021-06-21
Applicant: DENSO CORPORATION
Inventor： Makoto TANIGUCHI , Kazunari MORIYA , Kenji HIRAMOTO , Hideo NAKAI , Yuuko OHTANI , Shinya URATA , Masafumi NAMBA
IPC: H02P6/30
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.
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公开(公告)号：US20210265937A1
公开(公告)日：2021-08-26
申请号：US17315518
申请日：2021-05-10
Applicant: DENSO CORPORATION
Inventor： Takashi KASHIWAZAKI , Makoto TANIGUCHI
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.
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公开(公告)号：US20210257947A1
公开(公告)日：2021-08-19
申请号：US17306197
申请日：2021-05-03
Applicant: DENSO CORPORATION
Inventor： Hirofumi KINJO , Makoto TANIGUCHI
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.
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Patent Agency Ranking
公开(公告)号：US20200336032A1
公开(公告)日：2020-10-22
申请号：US16839465
申请日：2020-04-03
Applicant: DENSO CORPORATION
Inventor： Makoto TANIGUCHI
Abstract: A rotary electric machine according to the present disclosure provides a rotary electric machine including: a rotor; and a concentrated winding stator arranged coaxially to the rotor, in which the number of teeth of the concentrated winding stator is set to be a value where an integer which is multiple of 3 between adjacent prime numbers in a prime number sequence is multiplied by 2 and the number of poles of the rotor is set to be a value where any prime number between the adjacent prime numbers is multiplied by 2.
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公开(公告)号：US20200161951A1
公开(公告)日：2020-05-21
申请号：US16748362
申请日：2020-01-21
Applicant: DENSO CORPORATION
Inventor： Yuki TAKAHASHI , Makoto TANIGUCHI
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.
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公开(公告)号：US20190341867A1
公开(公告)日：2019-11-07
申请号：US16511779
申请日：2019-07-15
Applicant: DENSO CORPORATION
Inventor： Makoto TANIGUCHI , Yuuki TAKAHASHI
Abstract: A rotary electric machine is equipped with a stator and a rotor. The rotor has a d-axis magnetic circuit that is produced by a magnetomotive force of a field winding, and magnet magnetic circuits that are produced by a magnetic force of permanent magnets. The d-axis magnetic circuit and a q-axis magnetic circuit have at least a part thereof that is common to both. The permeance of the d-axis magnetic circuit is smaller than the permeance of the q-axis magnetic circuit, when a load is being applied to the rotor. A control apparatus of the rotary electric machine has a switching circuit that controls the field current in the field winding, and a control section that makes the switching frequency of the switching circuit become higher when the field current is above a threshold value than when the field current is less than or equal to the threshold value.
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公开(公告)号：US20180019687A1
公开(公告)日：2018-01-18
申请号：US15651047
申请日：2017-07-17
Applicant: DENSO CORPORATION
Inventor： Makoto TANIGUCHI , Asaka KIMURA , Keiji KONDO
IPC: H02M7/5387 , H02P27/06
CPC classification number: H02M7/5387 , H02P23/0027 , H02P27/06
Abstract: A rotating electric machine system includes a rotating electric machine and an electric power conversion circuit. The rotating electric machine includes N coils connected with each other to define a neutral point therebetween. The electric power conversion circuit includes N high-side switches, N low-side switches, a selector switch, a full-wave driver, a half-wave driver and a drive controller. The full-wave driver performs a full-wave drive process with high potential-side terminals of the low-side switches respectively connected with low potential-side terminals of the high-side switches by the selector switch. The half-wave driver performs a half-wave drive process with the high potential-side terminals of the low-side switches connected with the neutral point by the selector switch. The drive controller controls both the full-wave driver and the half-wave driver to selectively cause either the full-wave driver to perform the full-wave drive process or the half-wave driver to perform the half-wave drive process.
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公开(公告)号：US20140159534A1
公开(公告)日：2014-06-12
申请号：US14101391
申请日：2013-12-10
Applicant: Denso Corporation
Inventor： Makoto TANIGUCHI , Hiroki TOMIZAWA
CPC classification number: H02K1/2746 , H02K29/03 , H02K2213/03
Abstract: A rotating electric machine is equipped with a consequent-pole type rotor that includes a magnetic pole having a permanent magnet buried therein and a soft magnetic material pole that interposes two magnetic poles. The thickness of the permanent magnet and a circumferential width of the soft magnetic material pole have a relationship that prevents a spread of magnetic flux distribution in the circumferential direction within a gap between the soft magnetic material pole and a stator. As a result, a magnetic flux density difference in the circumferential direction is prevented, which enables a reduction of cogging torque based on an effective reduction of low-frequency space order components that originate from components other than a main component.
Abstract translation: 旋转电机配备有后置极型转子，其包括埋置有永磁体的磁极和插入两个磁极的软磁极。 永磁体的厚度和软磁性材料极的周向宽度具有防止软磁极与定子之间的间隙内的圆周方向的磁通分布扩大的关系。 结果，能够防止圆周方向的磁通密度差异，能够根据来自主成分以外的成分的低频空间分量的有效降低而减少齿槽转矩。
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