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公开(公告)号：US11108289B2
公开(公告)日：2021-08-31
申请号：US15733896
申请日：2018-06-06
发明人： Yuichiro Nakamura , Koji Shimomura , Yu Hirotani , Kenta Setaka
摘要： A rotor includes a rotor core, first magnetic poles that respectively include a plurality of permanent magnets and have a first polarity provided by the permanent magnets, and second magnetic poles that are each formed between the permanent magnets adjacent to one another and are salient poles having a polarity different from the first polarity. θim and θis satisfy the relation θim>θis. θom and θos satisfy the relation (θom×1.1)≥θos≥(θom×0.9). The rotor thus obtained can suppress increase in cogging torque while suppressing decrease in torque.
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公开(公告)号：US10944347B2
公开(公告)日：2021-03-09
申请号：US16474677
申请日：2017-02-16
发明人： Yuji Takizawa , Yu Hirotani , Masafumi Okazaki , Satoru Akutsu
IPC分类号： H02P6/12 , H02P21/22 , H02P25/098 , H02K1/22 , H02K3/47
摘要： Provided is a rotary electrical machine, which is reduced in size of a motor through use of reluctance torque being a feature of an IPM motor, and in which, in driving in times other than a rated time, a current phase angle is shifted from an angle at which a total torque is maximized so that an increase in torque ripple is suppressed even when the current phase angle changes, to thereby provide characteristics of small size, high output, and low torque ripple.
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公开(公告)号：US09755470B2
公开(公告)日：2017-09-05
申请号：US15311068
申请日：2015-08-04
发明人： Yu Hirotani , Masatsugu Nakano , Kazumasa Ito , Hiroko Ueyama
摘要： In a rotary electric machine, when armature coil bodies of respective phases in which first and second armature windings, are both wound around 6 k×n teeth are set as Ua, Va, and Wa, armature coil bodies of respective phases in which only the first and armature winding is wound around 6 m×n teeth are set as Ub, Vb, and Wb, and armature coil bodies of respective phases in which only the second armature winding is wound around 6 m×n teeth are set as Uc, Vc, and Wc, Ua, Va, Wa, Ub, Vb, Wb, Uc, Vc, and Wc are respectively arranged so as to exhibit 2 n-fold rotational symmetry about an axial center of a rotor.
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公开(公告)号：US11958544B2
公开(公告)日：2024-04-16
申请号：US17056517
申请日：2018-07-13
发明人： Tatsuya Mori , Yu Hirotani
CPC分类号： B62D5/0463 , B62D1/286 , H02P5/74
摘要： A control device for an electric power steering device includes an inverter converting direct current voltage into alternating current voltage, and apply to a synchronous motor; and a controller for converting three-phase current flowing in the synchronous motor into d-axis and q-axis currents, performing proportional integral control for a deviation between q-axis current command and the q-axis current so that the q-axis current follows the q-axis current command, to calculate q-axis voltage command, performing proportional integral control to calculate d-axis voltage command, converting the d-axis and q-axis voltage commands into three-phase voltage command, and controlling the inverter based on the three-phase voltage command. A q-axis proportional gain used in the proportional integral control for the q-axis current is obtained using a time constant of a q-axis current control system, a q-axis or d-axis inductance, and a constant greater than zero and less than one.
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公开(公告)号：US11784595B2
公开(公告)日：2023-10-10
申请号：US17613159
申请日：2019-07-30
发明人： Tatsuya Mori , Masahiko Orii , Genki Fujii , Yu Hirotani
CPC分类号： H02P21/05 , B62D5/0463 , H02P21/22
摘要： To provide a controller for AC rotary electric machine and an electric power steering apparatus which can superimposes a cancellation current for canceling the torque ripple component on the winding current in feedforward manner and cancel the torque ripple component. A controller for AC rotary electric machine calculates an oscillation voltage command value of q-axis which has the same frequency as the torque ripple component; calculates a reverse phase of the torque ripple component based on the current information and the magnetic pole position; calculates a correction phase corresponding to the phase delay of the actual current with respect to the oscillation voltage command value of q-axis; and sets a phase of the oscillation voltage command value of q-axis to a phase obtained by advancing the reverse phase of the torque ripple component by the correction phase.
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公开(公告)号：US10910892B2
公开(公告)日：2021-02-02
申请号：US15562980
申请日：2015-04-22
发明人： Yu Hirotani , Kazumasa Ito , Yuji Takizawa , Satoru Akutsu , Hiroshi Aida , Shusuke Hori
摘要： In the rotary electric machine according to the present invention, a plurality of core sheets include linked core sheets that include linking portions that protrude circumferentially from flange portions so as to link together tip portions of adjacent tooth portions, at least one sheet of the linked core sheets is formed such that a tooth tip portion shape is mirror-asymmetrical relative to a tooth central axis that passes through a circumferential center of the tooth portions, and a stator core is configured by laminating the linked core sheets such that circumferential positions of the linking portions are offset.
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公开(公告)号：US10903769B2
公开(公告)日：2021-01-26
申请号：US16474677
申请日：2017-02-16
发明人： Yuji Takizawa , Yu Hirotani , Masafumi Okazaki , Satoru Akutsu
IPC分类号： H02P6/12 , H02P21/22 , H02P25/098 , H02K1/22 , H02K3/47
摘要： Provided is a rotary electrical machine, which is reduced in size of a motor through use of reluctance torque being a feature of an IPM motor, and in which, in driving in times other than a rated time, a current phase angle is shifted from an angle at which a total torque is maximized so that an increase in torque ripple is suppressed even when the current phase angle changes, to thereby provide characteristics of small size, high output, and low torque ripple.
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公开(公告)号：US10855121B2
公开(公告)日：2020-12-01
申请号：US16079000
申请日：2016-12-26
发明人： Yu Hirotani , Kazumasa Ito , Hiroko Ikeda , Kodai Okazaki , Shinichi Yamaguchi
摘要： Provided is a rotary electric machine capable of reducing an amount of leakage magnetic flux passing through connecting portions. A cutout portion is formed in the connecting portion so as to be located on a side closer to a magnetic air gap portion. The connecting portion has a slot portion-side thin connecting portion formed so as to be closer to a slot portion than the cutout portion. A slot projecting portion projecting from the slot portion toward the magnetic air gap portion with respect to the slot portion-side thin connecting portion is formed in a portion of the connecting portion that is shifted in the circumferential direction from a portion of the connecting portion in which the slot portion-side thin connecting portion is formed. The slot projecting portion is arranged on each of circumferential sides of the cutout portion.
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公开(公告)号：US09923438B2
公开(公告)日：2018-03-20
申请号：US14779445
申请日：2014-03-04
发明人： Shinichi Ito , Sachiko Kawasaki , Yu Hirotani , Masatsugu Nakano , Toyoaki Udo , Hiroyuki Matsuo
IPC分类号： H01F7/06 , H02K15/085 , H02K1/16 , H02K3/12 , H02K15/04
CPC分类号： H02K15/085 , H02K1/165 , H02K3/12 , H02K15/04 , H02K2213/03
摘要： A stator core includes an inner ring core composed of a plurality of teeth arranged in the circumferential direction and a connection portion connecting inner circumferential portions of the plurality of teeth; and an outer ring core to be joined to an outer circumferential surface of the inner ring core. Slots of the stator core each have a circumferential direction width (a) on an inner circumference side smaller than a circumferential direction width (b) on an outer circumference side. A stator coil composed of conductive coils including a plurality of slot accommodated portions and a plurality of coil end portions connecting the slot accommodated portions is inserted and placed in the slots from an outer side in the radial direction of the inner ring core.
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公开(公告)号：US12128967B2
公开(公告)日：2024-10-29
申请号：US17778291
申请日：2020-01-15
发明人： Tatsuya Mori , Kenta Kubo , Itaru Iki , Yu Hirotani
CPC分类号： B62D5/046 , B62D5/0487 , H02P27/08
摘要： To provide a control apparatus for AC rotary machine and an electric power steering apparatus which can reduce the error component of the current detection value close to the mechanical resonance period of AC rotary machine. A control apparatus for AC rotary machine detects currents which flow into three-phase windings at a current detection period which is a first natural number times of a carrier period; calculates current detection values, by performing a current addition processing which adds current detection values detected at this time, and current detection values detected before an addition period which is a second natural number times of the current detection period; and calculates the voltage command values of three-phase based on the current detection values after current addition processing, wherein the second natural number is set to a natural number that the addition period becomes the closest to the half period of the mechanical resonance period.
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