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公开(公告)号：US11848587B2
公开(公告)日：2023-12-19
申请号：US18013004
申请日：2021-07-07
申请人： BIEN-AIR HOLDING SA
发明人： David Bühlmann
CPC分类号： H02K1/2783 , H02K1/02 , H02K7/003 , A61B17/32002 , A61B2017/00398 , A61B2217/005 , A61C1/02
摘要： The present invention relates to a rotary micromotor (10) designed for actuating an abrasive blade (4) of a surgical or dental tool, the motor comprising a rotor (11) co-operating with a stator (12), and being characterized in that the rotor (11) has a hollow central tubular portion, and comprises an outwardly polarized Halbach array.
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公开(公告)号：US20230170776A1
公开(公告)日：2023-06-01
申请号：US18071458
申请日：2022-11-29
发明人： Liam Bowman , David Morgan
IPC分类号： H02K15/16 , H02K1/2783 , H02K1/28 , H02K15/03
CPC分类号： H02K15/165 , H02K1/28 , H02K1/2783 , H02K15/03
摘要： The present invention relates to a slotless motor including a thin-walled hollow rotor body 100, and methods of manufacture of such rotors, the methods including hot forming and machining steps. The rotor body has a rotational axis 102 and comprises a first cylindrical portion 104 having a first diameter, a second cylindrical portion 106 having a second diameter, larger than the first diameter and a third cylindrical portion 108 having a third diameter, smaller than the second diameter, the third cylindrical portion located at a second end of the rotor body 100. A first end cap 110 joins the first and second cylindrical portions together, and a second end cap 112 joins the first and second cylindrical portions together. The first, second and third cylindrical portions are all arranged coaxially with the rotational axis 102 of the rotor 100 such that the second cylindrical portion 108 and the first and second end caps collectively define a hollow cavity 114 in the rotor body 100. The rotor body 100 may be provided with a Halbach array.
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公开(公告)号：US20220416601A1
公开(公告)日：2022-12-29
申请号：US17847668
申请日：2022-06-23
发明人： Liam Bowman , Johannes Landgraf
IPC分类号： H02K1/2783 , H02K7/00 , H02K1/30 , H02K1/32
摘要： A rotor for an electric machine is disclosed herein. The rotor comprises: a central shaft; a rotor drum arranged radially outward of the central shaft, wherein the rotor drum comprises a hollow cylinder for carrying permanent magnets on an inner and/or outer surface of the hollow cylinder, and wherein the rotor drum is coaxial with both the central shaft and a rotational axis of the rotor; and a cap arranged to couple the central shaft to the rotor drum to enable the rotor drum and central shaft to rotate together about the rotational axis. An inner portion of the cap is coupled to the central shaft at a first position along the length of the rotational axis, and an outer portion of the cap is coupled to the rotor drum at a second position along the length of the rotational axis. The first position is at a different length along the rotational axis to the second position.
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公开(公告)号：US20220173628A1
公开(公告)日：2022-06-02
申请号：US17442621
申请日：2020-01-10
申请人： NIDEC CORPORATION
发明人： Junya TANAKA
IPC分类号： H02K1/2783 , H02K11/215 , H02K21/16
摘要： A motor includes a rotor magnet, a stator, and a magnetic sensor. The rotor magnet includes magnetized portions in a Halbach array, and having radially magnetized portions whose magnetization direction is a radial direction and non-radially magnetized portions. In first and second radially magnetized portions, magnetic poles on both sides in the radial direction are arranged opposite to magnetic poles on both sides in the radial direction of the first radially magnetized portion. The first and second radially magnetized portions are alternately arranged along a circumferential direction with at least one non-radially magnetized portion therebetween. The magnetic sensor is located on the other side in the radial direction with respect to the rotor magnet. A non-magnetized portion is in an axial portion of the rotor magnet where a magnetic field is detected by the magnetic sensor, and located between the first and second radially magnetized portions in the circumferential direction.
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公开(公告)号：US20240128819A1
公开(公告)日：2024-04-18
申请号：US17966525
申请日：2022-10-14
申请人： BETA AIR, LLC
CPC分类号： H02K1/30 , B64C27/32 , H02K1/2783 , H02K9/227 , H02K15/03 , H02K21/16 , B64C29/0008
摘要： A rotor for a motor of an electric aircraft is provided. The rotor includes a retention band surrounding a plurality of magnets. The retention band is designed to retain the magnets in their positions and provide a way for heat to dissipate from the magnets. The retention band may also reduce eddy currents found within the rotor. A method of manufacturing a rotor with a retention band is also provided.
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公开(公告)号：US11863022B2
公开(公告)日：2024-01-02
申请号：US17442621
申请日：2020-01-10
申请人： NIDEC CORPORATION
发明人： Junya Tanaka
IPC分类号： H02K1/27 , H02K1/2783 , H02K11/215 , H02K21/16
CPC分类号： H02K1/2783 , H02K11/215 , H02K21/16
摘要： A motor includes a rotor magnet, a stator, and a magnetic sensor. The rotor magnet includes magnetized portions in a Halbach array, and having radially magnetized portions whose magnetization direction is a radial direction and non-radially magnetized portions. In first and second radially magnetized portions, magnetic poles on both sides in the radial direction are arranged opposite to magnetic poles on both sides in the radial direction of the first radially magnetized portion. The first and second radially magnetized portions are alternately arranged along a circumferential direction with at least one non-radially magnetized portion therebetween. The magnetic sensor is located on the other side in the radial direction with respect to the rotor magnet. A non-magnetized portion is in an axial portion of the rotor magnet where a magnetic field is detected by the magnetic sensor, and located between the first and second radially magnetized portions in the circumferential direction.
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公开(公告)号：US11831210B2
公开(公告)日：2023-11-28
申请号：US17713120
申请日：2022-04-04
申请人： Mirko Dusan Vojnovic
发明人： Mirko Dusan Vojnovic
IPC分类号： H02K16/02 , H02K21/12 , H02K3/12 , H02K1/2792 , H02K1/2783
CPC分类号： H02K16/02 , H02K1/2783 , H02K1/2792 , H02K3/12 , H02K21/12
摘要： The invention relates to a non-cogging electric generator having at least one stator and at least one dual rotor, wherein the dual rotor comprises a plurality of primary magnet devices arranged in circular Halbach array. Non-cogging is achieved by having inner and outer rotor rotating synchronously. Concentration of magnetic flux is achieved by magnetic devices tapering into pyramidal shape, such that magnetic devices arranged on the inner rotor are facing magnetic devices on the outer rotor, whereas said magnetic devices are facing each other with the opposite polarity. Stator comprises electrical wire windings and is positioned between inner and outer rotor.
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公开(公告)号：US20230253842A1
公开(公告)日：2023-08-10
申请号：US18106654
申请日：2023-02-07
发明人： Akihiro Ito , Nobuo Aruga , Tatsuya Nemoto , Tokio Morohoshi
IPC分类号： H02K1/276 , H02K1/2783 , H01F41/02
CPC分类号： H02K1/2766 , H01F41/0253 , H02K1/2783 , H02K41/02
摘要： Provided is a magnet that allows the orientation direction of main and auxiliary pole pieces to be set precisely and enables easy fabrication of flux focusing permanent magnet units having a high magnetic flux density A magnet 22 includes permanent magnet units 22a each including a main pole piece 221 and auxiliary pole pieces 222. The main pole piece 221 is composed of permanent magnet sheets 221a with substantially the same thickness stacked in the thickness direction. The auxiliary pole pieces 222 are composed of permanent magnet sheets 222a with substantially the same thickness stacked in the thickness direction and arranged at positions adjacent to the main pole piece 221 with orientation directions different from the orientation direction of the main pole piece 221 thereby to focus the magnetic flux at the main pole piece 221.
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公开(公告)号：US20220376571A1
公开(公告)日：2022-11-24
申请号：US17747002
申请日：2022-05-18
发明人： Michio SATO
IPC分类号： H02K1/2783 , H02K15/03
摘要： A rotary motor includes a stator having a coil, and a rotor placed apart from the stator and rotating around a rotation shaft, wherein the rotor has a rotor frame coupled to the rotation shaft, and a magnet placed on the rotor frame, when a direction from the magnet to the coil is a first direction, the magnet has a plurality of first magnets having anisotropy and magnetized at least in the first direction, and a second magnet having isotropy and placed on end surfaces of the first magnets at a positive side in the first direction.
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公开(公告)号：US20240258850A1
公开(公告)日：2024-08-01
申请号：US18564393
申请日：2022-05-18
发明人： Andreas REEH , Christian LOESCH
IPC分类号： H02K1/2783 , H02K21/16
CPC分类号： H02K1/2783 , H02K21/16
摘要： The invention relates to a synchronous machine which is excited by permanent magnets and has a stator (2) and a rotor (1) which rotates adjacent to the stator (2) about a longitudinal axis (3). The rotor (1) comprises a number of surface magnets which are disposed along the circumference of the rotor (1). The surface magnets are designed as Halbach arrays (4), each of which comprises tangential segments (PM1, PM4, PM5, PM8), in which the magnetisation direction (M) is oriented predominantly in the circumferential direction, and normal segments (PM2, PM3, PM6, PM7), in which the magnetisation direction (M) is oriented predominantly in the radial direction or counter to the radial direction, and in the field of the stator (2) the tangential segments (PM1, PM14, PM5, PM8) are subjected to a radially inwardly directed force (−Fn) and the normal segments (PM2, PM3, PM6, PM7) are subjected to a radially outwardly directed force (+Fn). According to the invention, the tangential segments (PM1, PM4, PM5, PM8) and the normal segments (PM2, PM3, PM6, PM7) are shaped in such a way that, by form fitting, the tangential segments (PM1, PM4, PM5, PM8) partially compensate for the forces directed radially outwards onto the normal segments (PM2, PM3, PM6, PM7) by means of the forces directed radially inwards onto the tangential segments (PM1, PM4, PM5, PM8).
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