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公开(公告)号：US20220181932A1
公开(公告)日：2022-06-09
申请号：US17598296
申请日：2020-01-10
Applicant: NIDEC CORPORATION
Inventor： Junya TANAKA , Tomoya UEDA
IPC: H02K1/2792 , H02K15/03 , H02K1/24
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：US20220006341A1
公开(公告)日：2022-01-06
申请号：US17280430
申请日：2019-09-26
Applicant: Nidec Corporation
Inventor： Shinji TAKEMOTO , Tomoya UEDA , Mitsuhiro TAKEMOTO , Yusuke ISOGAI
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：US20210044234A1
公开(公告)日：2021-02-11
申请号：US16968161
申请日：2019-02-08
Applicant: NIDEC CORPORATION , NIDEC ELESYS CORPORATION
Inventor： Shuji ENDO , Tokuji TATEWAKI , Tomoya UEDA , Masanori WATAHIKI , Tomonari MORI
Abstract: A motor control system includes an inverter, and a control unit that feedback-controls the inverter. The control unit includes a voltage control unit that calculates a voltage command value indicating a voltage to be applied to the motor from the inverter based on a current deviation between a current command value and an actual current detection value, and a torque ripple compensation 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 passing through the voltage control unit. The torque ripple compensation unit calculates the compensation value based on an actual angular velocity at which the motor rotates and the target current command value, and based on advance angle control for compensating a response delay of the motor control system with respect to the compensation value.
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公开(公告)号：US20190178261A1
公开(公告)日：2019-06-13
申请号：US16321511
申请日：2017-08-04
Applicant: Nidec Corporation
Inventor： Satoshi KAJIKAWA , Tomoya UEDA , Yusuke MAKINO
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：US20220344997A1
公开(公告)日：2022-10-27
申请号：US17764155
申请日：2020-09-01
Applicant: NIDEC CORPORATION
Inventor： Hibiki TAKADA , Tomoya UEDA , Takahiro HIWA
IPC: H02K3/50
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 across the teeth, first and second pins each including a connection portion connecting the working portion in a circumferential direction, and a third pin connected to the bus bar. The working portion of the second pin is disposed on one of the outermost and innermost stages of the slot, and the working portion of the third pin is disposed on one or the other of the outermost and innermost stages of the slot. A number of teeth straddled by the second pin is larger by two than a number of teeth straddled by the first pin.
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Patent Agency Ranking
公开(公告)号：US20220278573A1
公开(公告)日：2022-09-01
申请号：US17634257
申请日：2020-06-08
Applicant: Nidec Corporation
Inventor： Yabo HU , Tomoya UEDA , Kosuke MIZUIKE
IPC: H02K1/276
Abstract: An interior permanent magnet motor includes a rotor with permanent magnets spaced apart in a circumferential direction, and a rotor core with core pieces positioned between adjacent permanent magnets. The permanent magnets include a pair of corner portions at each of an end on an outside in a radial direction and an end on an inside in the radial direction. Each of the core pieces includes at least one of an outer support portion that supports one corner portion of the pair of corner portions at the end of the permanent magnets on the outside in the radial direction or an inner support portion that supports one corner portion of the pair of corner portions at the end of the permanent magnets on the inside in the radial direction, and restricts movement of the permanent magnets in the radial direction.
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公开(公告)号：US20220181954A1
公开(公告)日：2022-06-09
申请号：US17598297
申请日：2020-01-10
Applicant: NIDEC CORPORATION
Inventor： Junya TANAKA , Tomoya UEDA
IPC: H02K15/03 , H02K1/2713
Abstract: One aspect of a method of manufacturing a rotor of the present invention is the method of manufacturing the rotor, which includes a rotor core rotatable about a central axis and a rotor magnet fixed to an outer peripheral surface of the rotor core, the method including a magnetization step of magnetizing a first magnetic member fixed to the outer peripheral surface of the rotor core to form the rotor magnet. The rotor core 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. In the magnetization step, the first magnetic member is magnetized in a state where a second magnetic member made of a magnetic material is inserted into the hole.
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18.发明申请公开(公告)号：US20200259378A1
公开(公告)日：2020-08-13
申请号：US16638457
申请日：2018-09-28
Applicant: NIDEC CORPORATION
Inventor： Tomoya UEDA , Shinji TAKEMOTO , Yusuke ISOGAI
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：US20200059182A1
公开(公告)日：2020-02-20
申请号：US16535379
申请日：2019-08-08
Applicant: Nidec Corporation , Nidec Elesys Corporation
Inventor： Masanori WATAHIKI , Tomonari MORI , Tomoya UEDA , Shuji ENDO , Tokuji TATEWAKI
Abstract: A motor controller includes an inverter that drives a motor, an operation controller that controls the inverter according to a current command value, and a torque ripple compensation generator that adds a compensation value to compensate for a torque ripple in the motor to the current command value. The operation controller uses, as the current command value, a q-axis current command value indicating a q-axis current in a rotational coordinate system of the motor, and also uses, as the current command value, at least temporarily a d-axis current command value indicating a d-axis current in the rotational coordinate system, and the torque ripple compensation generator calculates a phase difference of the compensation value with respect to the q-axis current command value according to an equation using the q-axis current command value and the d-axis current command value as variables.
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公开(公告)号：US20190288586A1
公开(公告)日：2019-09-19
申请号：US16299204
申请日：2019-03-12
Applicant: Nidec Corporation
Inventor： Shinji TAKEMOTO , Tomoya UEDA , Kosuke MIZUIKE
Abstract: A drive device includes a hollow hub rotatable about hub shafts extending parallel to a center axis, a motor housed in the hub and fixed to the hub shafts, and a speed reducer connected to the motor and the hub. The motor includes a rotor including a motor shaft extending parallel to the hub shafts, a stator disposed outside the rotor in a radial direction, and a motor housing holding the stator therein. The drive device includes thermal grease thermally connecting the hub and the motor housing to each other.
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