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公开(公告)号：EP4164093A1
公开(公告)日：2023-04-12
申请号：EP21821468.2
申请日：2021-06-08
IPC分类号： H02K1/27
摘要： A technique by which the magnetic flux of the magnetic pole facing the stator of the magnet can be further increased in a rotor, is provided. An electric motor according to the present disclosure includes a stator 10; a rotor 20 facing the stator 10 in an axial direction (first direction) and configured to be rotatable in a circumferential direction (second direction) that is orthogonal to the axial direction; and a short-circuit reduction member 25, 26, wherein the rotor 20 includes a main magnet 22 having a first magnetic pole on a surface facing the stator 10; an auxiliary magnet 23, 24 arranged adjacent to the main magnet 22 and having a second magnetic pole and a third magnetic pole that is different in polarity from the second magnetic pole, and configured to increase a magnetic flux of the first magnetic pole, and wherein the auxiliary magnet 23, 24 is arranged adjacent to the main magnet 22 in a radial direction (third direction) that is orthogonal to the axial direction, and the short-circuit reduction member 25, 26 is provided at a portion around the auxiliary magnet 23, 24 facing the auxiliary magnet 23, 24 in parallel with a virtual line connecting the second magnetic pole and the third magnetic pole, to reduce a short-circuit of a magnetic flux between the second magnetic pole and the third magnetic pole.
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公开(公告)号：EP4462672A1
公开(公告)日：2024-11-13
申请号：EP24732155.7
申请日：2024-02-27
发明人： MIWA, Daiki , SAKAWAKI, Atsushi , INOUE, Tatsuki
摘要： A bearingless motor (110) includes a rotor (111) provided on a rotary shaft (101), and a stator (112) including a shaft support winding (113) and a motor winding (115). A first inverter (114) supplies electric power to the shaft support winding (113) to generate a shaft support force for supporting the rotary shaft (101) in a non-contact manner. A second inverter (116) supplies electric power to the motor winding (115) to generate a rotational torque in the rotary shaft (101). A control unit (200) commands one or both of the first and second inverters (114, 116) to output a voltage or a current on which a harmonic is superimposed in order to reduce a fluctuation in the shaft support force, where the harmonic is obtained by multiplication of a rotational frequency of the bearingless motor (110) by a natural number of two or more.
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公开(公告)号：EP4167450A1
公开(公告)日：2023-04-19
申请号：EP21821536.6
申请日：2021-06-09
IPC分类号： H02K9/02
摘要： A technique that can prevent an increase in size of an electric motor is provided. According to an embodiment of the present disclosure, an electric motor 400 includes a rotor 10, a stator 20, a through-hole 14A, and an inflow path (such as a gap 36 or a through-hole 38). The rotor 10 is configured to be rotatable about a rotation axis AX, and a turbofan 300 is fixed to the rotor 10. The stator 20 is disposed inward of the rotor 10 and includes claw pole stator units 21. Each of the claw pole stator units 21 includes a winding 212 that is wound in an annular shape around the rotation axis AX and a stator core 211 that surrounds the winding 212. The through-hole 14A is provided in one end portion of the rotor 10 so as to penetrate from the inside to the outside of the rotor 10. The stator 20 is provided in the inside and the turbofan 300 is fixed to the outside of the rotor 10. The inflow path is configured to cause a surrounding fluid to flow into the inside of a stator unit 21C provided at one other end portion opposite to the one end portion in an axial direction.
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