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公开(公告)号：US20210384784A1
公开(公告)日：2021-12-09
申请号：US17409340
申请日：2021-08-23
Applicant: DENSO CORPORATION
Inventor： Yuki TAKAHASHI
Abstract: A rotating electrical machine includes a magnetic field-producing unit and an armature. A magnet unit is equipped with a plurality of magnets arranged adjacent each other in a circumferential direction. Each of the magnets is magnetically oriented to have an easy axis of magnetization which is aligned near a d-axis that is defined on a center of the magnetic pole to be more parallel to the d-axis than an easy axis of magnetization near a q-axis that is defined on a boundary between the magnetic poles. An armature winding includes conductive members which face the magnetic field-producing unit and are arranged at a given interval away from each other in the circumferential direction. Each of the magnets has an end surface which faces in the circumferential direction and is placed in direct contact with an end surface of a circumferentially adjacent one of the magnets.
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公开(公告)号：US20210367465A1
公开(公告)日：2021-11-25
申请号：US17397263
申请日：2021-08-09
Applicant: DENSO CORPORATION
Inventor： Yuki TAKAHASHI
Abstract: A rotating electrical machine includes a magnetic field-producing unit and a magnetic carrier. The magnetic field-producing unit includes a magnet unit equipped with magnetic poles arranged to have magnetic polarities. The rotating electrical machine includes an armature equipped with a multi-phase winding. The magnet unit is mounted to a stator-side peripheral surface of the magnet carrier. The rotating electrical machine incudes a cylindrical restriction member mounted on the stator-side peripheral surface of the magnet unit. The restriction member is configured to restrict radial movement of the magnet unit relative to the magnet carrier. The restriction member has a stacked configuration stacked in an axial direction of the rotor.
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公开(公告)号：US20210265885A1
公开(公告)日：2021-08-26
申请号：US17245071
申请日：2021-04-30
Applicant: DENSO CORPORATION
Inventor： Yuki TAKAHASHI , Kazuya IWASE
Abstract: In a rotating electrical machine, a field generator includes a magnet unit and a cylindrical magnet holder. The magnet unit includes circular-arc magnets arranged in the circumferential direction. Each magnet has an outer peripheral surface, and first and second end surfaces in the circumferential direction. Recesses are formed in the outer peripheral surface of the magnet unit. Each recess is configured to open toward a radially outside direction. Elastic members are respectively located in installation spaces. Each installation space is defined between a corresponding one recess and the inner peripheral surface of the magnet holder. Each elastic member is installed in a corresponding one installation space while being in compressed state therein to create elastic force. The elastic forces of the respective elastic members are configured to press the magnets radially inward.
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公开(公告)号：US20200336031A1
公开(公告)日：2020-10-22
申请号：US16915238
申请日：2020-06-29
Applicant: DENSO CORPORATION
Inventor： Yuki TAKAHASHI
Abstract: A rotating electric machine includes a field system, which includes a magnet section, and an armature. The magnet section includes a plurality of magnets that are arranged at predetermined intervals and in alignment with each other in a circumferential direction. The magnets have easy axes of magnetization oriented such that at locations closer to a d-axis, the directions of the easy axes of magnetization are more parallel to the d-axis than at locations closer to a q-axis. In the magnets, magnet magnetic paths are formed along the easy axes of magnetization. The field system further includes a field-system core that is formed of a soft-magnetic material. The field-system core has protrusions protruding to the armature side. Each of the protrusions is located closer to the q-axis than to the d-axis in the circumferential direction. Circumferential end surfaces of the protrusions respectively abut circumferential end surfaces of the magnets.
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公开(公告)号：US20200228038A1
公开(公告)日：2020-07-16
申请号：US16779831
申请日：2020-02-03
Applicant: DENSO CORPORATION
Inventor： Yuki TAKAHASHI
Abstract: In a rotary electric machine, magnets provided in a core generate circumferentially arranged magnetic poles. Each magnetic pole defines d- and q-axes. The d-axis represents a center of the corresponding magnetic pole. The rotary electric machine includes an armature including an armature winding. Each magnet includes a magnet body having opposing first and second flux effective surfaces. The first flux effective surface is a surface out of which magnetic flux flows. The second flux effective surface into which magnetic flux flows. The magnet body has a thickness defined as a minimum distance between the first and second flux effective surfaces. The magnet body has easy axes of magnetization. A length of a line along at least one of the easy axes of magnetization between the first and second flux effective surfaces is longer than the thickness of the magnet body.
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Patent Agency Ranking
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：US20200161910A1
公开(公告)日：2020-05-21
申请号：US16747997
申请日：2020-01-21
Applicant: DENSO CORPORATION
Inventor： Yuki TAKAHASHI
Abstract: A rotary electrical machine includes a switch for supplying power to a field winding and a controller. A ratio of an on-time to a switching cycle of the switch, i.e., 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 field current can take and which has a predetermined value less than 100%. The controller calculates the duty ratio on the condition that an upper limit of the duty ratio is set as the predetermined value and turns on/off the switch based on the calculated duty ratio, and sets the predetermined value to be larger as a rotation speed of a rotor is higher, or as a d-axis current flowing through an armature winding is larger.
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公开(公告)号：US20190334424A1
公开(公告)日：2019-10-31
申请号：US16306679
申请日：2017-06-01
Applicant: DENSO CORPORATION
Inventor： Yuki TAKAHASHI
Abstract: A rotary electrical machine includes: a rotary electrical machine having a stator and a rotor; and a control device. The rotor includes: a field core having a boss part and claw-shaped magnetic pole parts; a field winding that is wound on the boss part; and permanent magnets that are arranged between the claw-shaped magnetic pole parts. A d-axis magnetic circuit formed by magnetomotive force of the field winding and at least part of first and second magnet magnetic circuits formed by magnetic force of the permanent magnets are shared. When an electrical load is connected to the rotor, a permeance Prt of the d-axis magnetic circuit is set to be smaller than a permeance Pst of the q-axis magnetic circuit. The control device performs phase control such that the rotary electrical machine performs either power running or regeneration.
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公开(公告)号：US20180034332A1
公开(公告)日：2018-02-01
申请号：US15552213
申请日：2016-01-28
Applicant: DENSO CORPORATION
Inventor： Yuki TAKAHASHI
CPC classification number: H02K3/28 , H02K1/16 , H02K1/243 , H02K1/27 , H02K1/276 , H02K3/12 , H02K3/32 , H02K9/19 , H02K21/14 , H02K2213/03
Abstract: A rotary electric machine includes a rotor having a plurality of magnetic poles and a stator having a core and coil, the core including slots and the coil being formed of phase windings of three phases wound in the core. A slot multiple n is set to 2, each windings of the coil being wound as short windings extending over (n+1) adjacent slots. With the axis of rotation of the rotor as center, designating α as the arc ratio of a magnetic pole, β as the circumferential-direction angular range of magnetic flux interchange faces of the rotor, which face the core and at which magnetic flux is interchanged with the core, and designating γ as a slot pitch of the slots in the circumferential direction, relationships β≦2nγ and β
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公开(公告)号：US20170353065A1
公开(公告)日：2017-12-07
申请号：US15609428
申请日：2017-05-31
Applicant: DENSO CORPORATION
Inventor： Yuki TAKAHASHI
Abstract: A rotor for a rotating electric machine includes a field core having a plurality of claw-shaped magnetic pole portions, a field coil wound on the field core, and a hollow cylindrical core member disposed to cover radially outer peripheries of the claw-shaped magnetic pole portions of the field core. The core member is formed of a plurality of soft-magnetic bodies that are laminated in an axial direction of the core member. At least some of the soft-magnetic bodies forming the core member are fixed to one another by at least one staking portion that is formed along the axial direction of the core member.
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