公开(公告)号：US20180309330A1

公开(公告)日：2018-10-25

申请号：US15770245

申请日：2016-11-22

Applicant: Nidec Corporation

Inventor： Tomoya UEDA ,  Hiroshi KITAGAKI ,  Takeshi HONDA

IPC: H02K1/14 ,  H02K1/27 ,  H02K15/02

CPC classification number: H02K1/146 ,  H02K1/148 ,  H02K1/278 ,  H02K15/022 ,  H02K29/03 ,  H02K2201/06 ,  H02K2213/03

Abstract: A motor includes a rotor that rotates centered on a central axis extending in an axial direction, and a stator. The stator includes a stator iron core in which a plurality of laminated iron cores each including a tooth portion extending in a radial direction are arranged in a circumferential direction, and coils wound around the tooth portion. The laminated iron core includes a plurality of flat plate-shaped iron core pieces laminated in a plate thickness direction. The iron core piece is made of a non-oriented electromagnetic steel plate. A rolling direction of the iron core piece is inclined with respect to the radial direction. The laminated iron core is preferably formed by laminating the iron core pieces to be arranged with a same inclination. At least a pair of the laminated iron cores adjacent to each other in the circumferential direction has inclinations opposite to each other.

公开(公告)号：US20240014700A1

公开(公告)日：2024-01-11

申请号：US18254603

申请日：2021-09-28

Applicant: NIDEC CORPORATION

Inventor： Yukie YAMADA ,  Tomoya UEDA

IPC: H02K1/2753

CPC classification number: H02K1/2753

Abstract: A rotor includes a rotor core having a hole, and a magnet inside the hole. A stator includes a stator core having an annular core back surrounding the rotor core and teeth extending inward from the core back and arranged at intervals in a circumferential direction, and coils attached to the stator core. The hole has an arc shape protruding inward. The magnet is in the hole and has an arc shape extending along the hole. The rotor core has cavity portions sandwiching the magnet. A curved outer surface of the hole is in close contact with a curved outer surface of the magnet at a portion closer to a center in the circumferential direction than an end portion in the circumferential direction. At least a part of the cavity portion extends to the outer side in the circumferential direction with respect to the center of a pole.

公开(公告)号：US20230155432A1

公开(公告)日：2023-05-18

申请号：US17908601

申请日：2020-09-14

Applicant: Nidec Corporation

Inventor： Tomoya UEDA

IPC: H02K1/276

CPC classification number: H02K1/2766

Abstract: A motor includes a cylindrical rotor core, and a magnet group including first magnets and second magnets alternately arranged along a circumferential direction of the rotor core. A first magnetic flux line generated in the first magnets extends along a radial direction of the rotor core, and a second magnetic flux line generated in the second magnets is inclined with respect to the first magnetic flux line. The rotor core includes an inner portion located on a radially inner side of the magnet group and an outer portion located on a radially outer side of the magnet group. The outer portion includes a first iron core that covers the first magnet from the radially outer side, and a second iron core that covers at least a portion of the second magnet in the central axis direction of the rotor core from the radially outer side.

公开(公告)号：US20220345011A1

公开(公告)日：2022-10-27

申请号：US17762705

申请日：2020-09-01

Applicant: NIDEC CORPORATION

Inventor： Hibiki TAKADA ,  Tomoya UEDA ,  Takahiro HIWA

IPC: H02K15/04 ,  H02K15/06 ,  H02K3/28 ,  H02K3/12

Abstract: A stator includes: a stator core including teeth; pins including a working portion extending in an axial direction in a slot between the teeth; and bus bars electrically connected to the pins. In each slot, the working portions are disposed over stages in a radial direction. The pins include the two working portions disposed across the teeth, a first pin and a second pin each including a connection portion connecting the working portion in a circumferential direction, and a third pin connected to the bus bar. Each of the working portions of the second pin and the third pin is disposed in one of an outermost stage and an innermost stage of the slot. A number of teeth straddled by the second pin is smaller than a number of teeth straddled by the first pin.

公开(公告)号：US20220255381A1

公开(公告)日：2022-08-11

申请号：US17666522

申请日：2022-02-07

Applicant: NIDEC CORPORATION

Inventor： Tomoya UEDA ,  Toshiyuki SASAKI

IPC: H02K1/30 ,  H02K1/278 ,  H02K1/28 ,  H02K7/116 ,  H02K21/16

Abstract: A rotor includes a shaft, a cylindrical rotor core, a connector, magnets and a cover. The shaft extends along a central axis. The rotor core surrounds the shaft. The connector is provided radially inside the rotor core and connects the rotor core and the shaft. The magnets are provided radially outside the rotor core along a circumferential direction. The cover is provided radially outside the magnets. The connector includes a cylindrical body surrounding the shaft and a flange. The flange extends radially outward from one axial end of the body and faces the magnets in the axial direction. The cover includes a peripheral surface and an eave. The peripheral surface faces the magnets in a radial direction. The eave extends radially inward from an other axial end of the peripheral surface and faces the magnets in the axial direction.

公开(公告)号：US20200377144A1

公开(公告)日：2020-12-03

申请号：US16970950

申请日：2019-02-13

Applicant: NIDEC CORPORATION ,  NIDEC ELESYS CORPORATION

Inventor： Shuji ENDO ,  Tokuji TATEWAKI ,  Tomoya UEDA ,  Masanori WATAHIKI ,  Tomonari MORI

IPC: B62D5/04 ,  H02P6/10

Abstract: A motor control system includes an inverter, and a control calculation unit that feedback-controls the inverter. The control calculation unit includes a voltage control calculation unit that calculates a voltage command value indicating a voltage to be applied to the motor from the inverter on the basis of a current deviation between a current command value and an actual current detection value, a torque ripple compensation calculation unit that adds a compensation value for compensating a torque ripple in the motor to a signal value on at least one of an upstream side and a downstream side in a signal flow that passes through the voltage control calculation unit, and a current limit calculation unit that limits the current command value by adaptive control based on an actual angular velocity value indicating an angular velocity at which the motor rotates.

公开(公告)号：US20190393746A1

公开(公告)日：2019-12-26

申请号：US16402460

申请日：2019-05-03

Applicant: Nidec Corporation

Inventor： Shinji TAKEMOTO ,  Tomoya UEDA ,  Yusuke ISOGAI

IPC: H02K1/27 ,  H02K15/03 ,  H02K29/03 ,  H02K21/16 ,  H02K1/24 ,  H02K1/28 ,  H02K16/02 ,  H01H50/16

Abstract: A rotatable about a center axis includes a rotor core including an annular inner core portion extending along a circumferential direction, and outer core portions spaced apart along the circumferential direction on an outer side in a radial direction of the inner core portion, magnets each positioned between the outer core portions adjacent to each other in the circumferential direction, and a support that supports the rotor core and the magnet. The support includes an inner support portion that supports the magnet on an inner side in a radial direction of the magnet, an outer support portion that supports the magnet on an outer side in a radial direction of the magnet, and a bridge portion that extends in the radial direction to connect the inner support portion and the outer support portion. The outer core portion includes a penetrating portion that penetrates the outer core portion in the radial direction. At least a portion of the bridge portion is positioned inside the penetrating portion.

公开(公告)号：US20190052157A1

公开(公告)日：2019-02-14

申请号：US16059085

申请日：2018-08-09

Applicant: Nidec Corporation

Inventor： Yusuke MAKINO ,  Tomoya UEDA

IPC: H02K15/16 ,  H02K7/08 ,  H02K15/14 ,  H02K9/06 ,  H02K5/10 ,  H02K5/20 ,  H02K5/173

Abstract: A rotor assembly includes a shaft including a non-magnetic material and a central axis extending along an up and down direction as a center, and a cylindrical rotor main body fixed to an outer surface of the shaft. The rotor main body includes core pieces arranged around the shaft in a circumferential direction, rotor magnets alternately arranged with the core pieces around the shaft in the circumferential direction, and a connection portion made of resin and connecting the shaft to the core pieces and the rotor magnets. Inner ends of the rotor magnets in a radial direction are closer to the shaft than inner ends of the core pieces in the radial direction.

公开(公告)号：US20190052138A1

公开(公告)日：2019-02-14

申请号：US16053844

申请日：2018-08-03

Applicant: Nidec Corporation

Inventor： Yusuke MAKINO ,  Tomoya UEDA

IPC: H02K1/27 ,  H02K1/28 ,  H02K5/16

Abstract: A rotor assembly includes a shaft with a central axis extending along an up and down direction as a center, and a cylindrical rotor main body fixed to an outer surface of the shaft, and the rotor main body includes core pieces arranged around the shaft in a circumferential direction, rotor magnets alternately arranged with the core pieces around the shaft in the circumferential direction, and a connection portion made of resin and connecting the shaft to the core pieces and the rotor magnets. Each of the rotor magnets includes an engagement region covered by the connection portion of the rotor magnet surface, and an exposed region including an outer surface positioned outward of the rotor magnet surface in a radial direction and is exposed from the connection portion.

公开(公告)号：US20150270753A1

公开(公告)日：2015-09-24

申请号：US14573107

申请日：2014-12-17

Applicant: Nidec Corporation

Inventor： Tomoya UEDA

IPC: H02K1/27

CPC classification number: H02K1/2773 ,  H02K1/2766 ,  H02K2213/03

Abstract: A motor includes magnets arranged in a circumferential direction and a rotor core holding the magnets. The magnets include two or more magnet pairs with a pair of long sides and a pair of short sides. The pair of long sides have mutually different polarities. Magnetic poles of the same polarity are positioned circumferentially opposite to each other. A corner lying on a short-side side closer to the central axis and on a side closer to the other magnet of the magnet pair is located in a separate flux barrier in the rotor core. End points of a boundary between each magnet and a corresponding one of the flux barriers lie on one of the pair of long sides which includes the corner and on one of the pair of short sides which includes the corner or another one of the pair of long sides.

Abstract translation: 电动机包括沿圆周方向布置的磁体和保持磁体的转子芯。 磁体包括具有一对长边和一对短边的两个或更多个磁体对。 这对长边具有相互不同的极性。 相同极性的磁极彼此周向地定位。 靠近中心轴的短边侧和靠近磁体对的另一个磁体的一侧的角位于转子芯中的单独的磁通屏障中。 每个磁体和相应的一个磁通屏障之间的边界的终点位于包括拐角的一对长边中的一个上，并且在一对短边中的一个中，包括一对长边 边。