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公开(公告)号：US11362608B2
公开(公告)日：2022-06-14
申请号：US16970952
申请日：2019-02-08
Applicant: NIDEC CORPORATION
Inventor： Shuji Endo , Akitoshi Harada , Tomoya Ueda , Masanori Watahiki , Tomonari Mori , Tokuji Tatewaki
Abstract: One aspect of a noise compensation adjustment method includes: a measurement step of driving a motor to measure noise with respect to a coupled system including the motor and a driving body coupled to the motor and driven by the motor; an order identification step of, based on noise measured in the measurement step, identifying an order B of a component contributing to compensation of the noise from a k-th component and a 1/k-th component (k is an integer) in the rotation of the motor; an adjustment step of controlling driving of the motor using a component of the order B identified in the order identification step as a compensation value, and adjusting a component value of the order B to reduce the noise; and a recording step of recording the component value of the order B adjusted in the adjustment step as a compensation value for reducing the noise.
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公开(公告)号：US12149125B2
公开(公告)日：2024-11-19
申请号：US17908601
申请日：2020-09-14
Applicant: Nidec Corporation
Inventor： Tomoya Ueda
IPC: H02K1/276
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.
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公开(公告)号：US11502563B2
公开(公告)日：2022-11-15
申请号：US16638457
申请日：2018-09-28
Applicant: NIDEC CORPORATION
Inventor： Tomoya Ueda , Shinji Takemoto , Yusuke Isogai
IPC: H02K1/28 , H02K1/27 , H02K21/16 , H02K1/276 , B25J9/12 , B62M9/00 , B62M6/40 , B64C39/02 , H02K29/03
Abstract: According to one aspect of the present disclosure, a rotor includes a plurality of permanent magnets and a support supporting the permanent magnet. The support includes at least one of an outside support fixed to a radial outside of the outer cores to circumferentially support an end face of the permanent magnet from both sides and an inside support fixed to a radial inside of the outer cores to circumferentially support the end face of the permanent magnet from both sides. Each of the outer cores includes an opposite face parallelly opposed to the end face of the permanent magnet in the circumferential direction. The outside support and the inside support each includes a support face circumferentially supporting the end face. The support face is disposed on a side closer to a center line of the permanent magnet than the opposite face in the circumferential direction.
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公开(公告)号：US10658885B2
公开(公告)日：2020-05-19
申请号：US15770245
申请日：2016-11-22
Applicant: Nidec Corporation
Inventor： Tomoya Ueda , Hiroshi Kitagaki , Takeshi Honda
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.
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公开(公告)号：US11952057B2
公开(公告)日：2024-04-09
申请号：US16970382
申请日：2019-02-13
Applicant: NIDEC CORPORATION
Inventor： Shuji Endo , Tokuji Tatewaki , Tomoya Ueda , Masanori Watahiki , Tomonari Mori
Abstract: A motor control system includes an inverter, a voltage control calculating a voltage command value indicating a voltage to be applied to a motor from the inverter based on a deviation between the current command value and the actual current detection value, and a torque ripple compensation unit adding a compensation value for compensating a torque ripple in the motor to a signal value on an upstream side in a signal flow that passes through the voltage control unit. The torque ripple compensation unit includes a phase compensator calculating a compensation value component in the voltage control unit based on an actual angular velocity value indicating an angular velocity at which the motor rotates, and an inverse characteristic processor calculating a compensation value component for compensating the torque ripple based on an inverse characteristic of an open loop transfer function in a feedback control.
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Patent Agency Ranking
公开(公告)号：US11949293B2
公开(公告)日：2024-04-02
申请号：US17280430
申请日：2019-09-26
Applicant: Nidec Corporation
Inventor： Shinji Takemoto , Tomoya Ueda , Mitsuhiro Takemoto , Yusuke Isogai
IPC: H02K1/27 , H02K1/2791 , H02K1/28 , H02K15/03
CPC classification number: H02K1/2791 , H02K1/28 , H02K15/03
Abstract: A rotor used in an outer rotor motor includes a rotor holder in a tubular shape extending along a center axis, a rotor core in a tubular shape extending in an axial direction and being fixed to a surface of the rotor holder, directed radially inward, and permanent magnets bonded to an inner circumferential surface of the rotor core and side by side in a circumferential direction. The rotor core includes projection portions projecting radially inward from the inner circumferential surface of the rotor core. One or more of the projection portions are in a gap between the permanent magnets adjacent to each other in the circumferential direction. Each of the projection portions has an axial length shorter than an axial length of each of the permanent magnets.
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公开(公告)号：US11916440B2
公开(公告)日：2024-02-27
申请号：US17598296
申请日：2020-01-10
Applicant: NIDEC CORPORATION
Inventor： Junya Tanaka , Tomoya Ueda
IPC: H02K1/2792 , H02K1/24 , H02K15/03
CPC classification number: H02K1/2792 , H02K1/24 , H02K15/03
Abstract: One aspect of a rotor of the present invention includes: a rotor core rotatable about a central axis; and a rotor magnet fixed to an outer peripheral surface of the rotor core. The rotor magnet has a plurality of magnetized portions arranged along a circumferential direction in a Halbach array. The plurality of magnetized portions include a plurality of radially magnetized portions whose magnetization direction is a radial direction and a plurality of non-radially magnetized portions whose magnetization direction is different from the radial direction. The rotor core is a non-magnetic member that has a hole, recessed from a surface on one side in an axial direction of the rotor core to the other side in the axial direction and is made of a non-magnetic material. The hole is located on the radially inner side of the radially magnetized portion.
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公开(公告)号：US11784522B2
公开(公告)日：2023-10-10
申请号：US17666506
申请日：2022-02-07
Applicant: NIDEC CORPORATION
Inventor： Tomoya Ueda , Toshiyuki Sasaki , Yabo Hu
CPC classification number: H02K1/2773 , H02K1/279 , H02K2213/03
Abstract: A rotor includes: a shaft; a tubular rotor core; and a plurality of magnets. The shaft extends along a center axis. The rotor core surrounds the shaft. The plurality of magnets is disposed outside the rotor core in a radial direction and is aligned in a circumferential direction. A plurality of first recessed portions recessed outward in the radial direction is aligned in the circumferential direction in an inner surface of the rotor core in the radial direction. Each of the first recessed portions overlaps each of the magnets in the radial direction.
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公开(公告)号：US11286956B2
公开(公告)日：2022-03-29
申请号：US16321511
申请日：2017-08-04
Applicant: Nidec Corporation
Inventor： Satoshi Kajikawa , Tomoya Ueda , Yusuke Makino
IPC: H02K9/00 , F04D29/58 , H02K9/06 , H02K5/20 , H02K11/33 , H02K21/14 , F04D25/06 , F04D25/08 , H02K11/215 , F04D29/70 , H02K5/22 , H02K7/08 , H02K7/14 , H02K21/22
Abstract: A motor includes a shaft centered on a center axis oriented in a vertical direction, a bearing supporting the shaft, an armature disposed radially outward of the bearing, a bracket to which the bearing and the armature are fixed, and a covered cylindrical rotor connected to the shaft. The rotor includes a rotor lid portion connected to the shaft, a rotor side wall portion extending downward from an outer edge of the rotor lid portion, a blower plate portion connected to a lower surface of the rotor lid portion and extending radially outward from a center portion of the rotor lid portion, an inlet disposed radially outward of the cylindrical portion and penetrating the bracket, and an outlet disposed radially outward of the blower plate portion and radially penetrating the rotor.
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公开(公告)号：US11958543B2
公开(公告)日：2024-04-16
申请号：US16970950
申请日：2019-02-13
Applicant: NIDEC CORPORATION
Inventor： Shuji Endo , Tokuji Tatewaki , Tomoya Ueda , Masanori Watahiki , Tomonari Mori
CPC classification number: B62D5/046 , B62D5/0403 , B62D5/0481 , 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.
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