WO2020088085A1 - Rotor de moteur et moteur à aimant permanent - Google Patents

Rotor de moteur et moteur à aimant permanent Download PDF

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Publication number
WO2020088085A1
WO2020088085A1 PCT/CN2019/103972 CN2019103972W WO2020088085A1 WO 2020088085 A1 WO2020088085 A1 WO 2020088085A1 CN 2019103972 W CN2019103972 W CN 2019103972W WO 2020088085 A1 WO2020088085 A1 WO 2020088085A1
Authority
WO
WIPO (PCT)
Prior art keywords
permanent magnet
permanent magnets
motor
rotor
permanent
Prior art date
Application number
PCT/CN2019/103972
Other languages
English (en)
Chinese (zh)
Inventor
肖勇
王敏
尚文海
Original Assignee
珠海格力电器股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 珠海格力电器股份有限公司 filed Critical 珠海格力电器股份有限公司
Publication of WO2020088085A1 publication Critical patent/WO2020088085A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • the present application relates to the technical field of driving devices, in particular to a motor rotor and a permanent magnet motor.
  • the permanent magnet motor mainly includes a stator and a rotor.
  • the rotor includes a rotor core and permanent magnets.
  • the permanent magnets are installed in the magnetic steel slots of the rotor core.
  • the three-phase stator current When a three-phase symmetrical current flows into the stator side, the three-phase stator current generates a rotating magnetic field in the space because the three-phase stator differs by 120 ° in space, and the rotor is moved by the electromagnetic force in the rotating magnetic field. It is kinetic energy; when the permanent magnet generates a rotating magnetic field, the three-phase stator winding reacts through the armature under the action of the rotating magnetic field and induces a three-phase symmetrical current. At this time, the rotor kinetic energy is converted into electrical energy.
  • the magnetic field provided by the permanent magnet is fixed in the traditional permanent magnet motor, the magnetic field inside the permanent magnet motor is difficult to adjust, so it is difficult for the permanent magnet motor to take into account the efficiency at high frequency and low frequency, and the fixed power supply voltage limits the permanent magnet The maximum operating frequency of the motor.
  • a motor rotor, the motor rotor includes:
  • An even number of first permanent magnets are provided on the axial end surface of the rotor core along the circumferential direction of the rotor core;
  • At least two second permanent magnets the coercive force of the second permanent magnets is greater than the coercive force of the first permanent magnets, and each second permanent magnet is spaced between the two adjacent pairs of the Between the first permanent magnets, and each second permanent magnet is arranged in series with two adjacent first permanent magnets.
  • the even number of first permanent magnets are evenly spaced along the circumference of the rotor core, and each adjacent two of the first permanent magnets has a center facing the rotor core Angle, the second permanent magnet is disposed within the angle.
  • the center of the figure formed by the connection lines of the even numbered first permanent magnets coincides with the center of the rotor core.
  • the two first permanent magnets adjacent to each of the second permanent magnets are arranged symmetrically compared to the second permanent magnets.
  • the cross section of the first permanent magnet and the cross section of the second permanent magnet are both rectangular.
  • the dimensions of the first permanent magnet and the second permanent magnet satisfy the relationship 0.6 * L1 * Br1 ⁇ L2 * Br2 ⁇ 1.1 * L1 * Br1, 0.5 * d1 ⁇ d2 ⁇ 0.8 * d1;
  • L1, d1 and Br1 are the length, width and remanence of the first permanent magnet respectively;
  • L2, d2 and Br2 are the length, width and remanence of the second permanent magnet, respectively.
  • the cross-sectional shape of the first permanent magnet is a circular arc opening toward the center of the rotor core, and the cross-section of the second permanent magnet is rectangular.
  • a part of the magnetic lines between every two adjacent second permanent magnets along the circumferential direction of the rotor core communicate to form a magnetic circuit.
  • the rotor core is provided with magnetic isolation slots, and the magnetic isolation slots are located at both ends of the first permanent magnet along the circumferential direction of the rotor core.
  • a permanent magnet motor includes a stator and a motor rotor according to any one of the above, the motor rotor is rotatably sleeved in the stator.
  • each second permanent magnet is spaced between every two adjacent pairs of first permanent magnets.
  • the magnetizing current changes the magnetic field strength of the first permanent magnet with low coercive force, realizing the adjustable magnetic field of the permanent magnet motor, so that the permanent magnet motor achieves the efficiency when taking into account high frequency and low frequency; and the second permanent magnet and its adjacent
  • the two first permanent magnets are arranged in series, which can improve the demagnetization resistance of the first permanent magnet with low coercivity; at the same time, due to the permanent magnet motor in this application, when the first permanent magnet is magnetized, it directly passes through the middle
  • the two first permanent magnets without the second permanent magnet are magnetized, thus avoiding the second permanent magnet with high coercive force, reducing the magnetizing current, and greatly reducing the difficulty of magnetization.
  • FIG. 1 is a structural diagram of a permanent magnet motor provided by an embodiment of this application.
  • FIG. 2 is a structural diagram of a motor rotor of the permanent magnet motor provided in FIG. 1;
  • FIG. 3 is a schematic diagram of the magnetization of the first permanent magnet of the motor rotor provided in FIG. 2.
  • an embodiment of the present application provides a permanent magnet motor 100 including a stator 10 and a motor rotor 20.
  • the motor rotor 20 is coaxially sleeved in the stator 10, and the motor rotor 20 and the stator 10 have The air gap facilitates rotation of the motor rotor 20 relative to the stator 10.
  • the stator 10 includes a stator iron core 11 and an armature winding.
  • the stator iron core 11 is stamped from a soft magnetic silicon steel sheet, and a plurality of teeth 111 are provided in the stator iron core 11 at intervals in the circumferential direction, each tooth
  • the armature winding is wound around 111, and the armature winding is energized to generate a rotating magnetic field, and acts on the motor rotor 20 to cause the motor rotor 20 to rotate.
  • the motor rotor 20 includes a rotor core 21 and permanent magnets.
  • the rotor core 21 is stamped from a soft magnetic silicon steel sheet, and the permanent magnets are arranged on the axial end surface of the rotor core 21 in the axial direction.
  • the axial end surface of the rotor core 21 is provided with a magnetic steel slot, and the permanent magnet is installed in the magnetic steel slot.
  • the magnetic steel slot includes a first magnetic steel slot 211 and a second magnetic steel slot 212
  • the permanent magnet includes a first permanent magnet 22 and a second permanent magnet 23
  • the coercive force of the second permanent magnet 23 is greater than the
  • the coercive force of a permanent magnet 22 is that the first permanent magnet 22 is installed in the first magnetic steel groove 211 and the second permanent magnet 23 is installed in the second magnetic steel groove 212.
  • first magnetic steel slots 211 there are an even number of first magnetic steel slots 211, and even numbered first magnetic steel slots 211 are opened on the axial end surface of the rotor core 21 along the circumferential interval of the rotor core 21, accordingly, the first There are an even number of permanent magnets 22, and the first permanent magnets 22 are arranged in the first magnetic steel groove 211 of the rotor core 21 at intervals along the circumferential direction of the rotor core 21.
  • Each second magnetic steel groove 212 is disposed between each adjacent two pairs of first magnetic steel grooves 211 (each adjacent two first magnetic steel grooves 211 is divided into a pair), and correspondingly, each second The magnet 23 is disposed between each adjacent two pairs of first permanent magnets 22 (each adjacent two first permanent magnets 22 are divided into a pair), and each second permanent magnet 23 is adjacent to its two adjacent first A permanent magnet 22 (the two first permanent magnets 22 are two first permanent magnets 22 that are close to each other among the two adjacent pairs of first permanent magnets 22) are arranged in series.
  • the permanent magnet motor 100 and the motor rotor 20 include a first permanent magnet 22 and a second permanent magnet 23 having different coercive forces, and each second permanent magnet 23 is spaced apart from each adjacent two pairs of first permanent magnets. Between magnets 22.
  • the first permanent magnet 22 with low coercivity is magnetized and saturated by the magnetizing current, so that the strength of the magnetic field inside the permanent magnet motor 100 is enhanced to meet the needs;
  • the magnetization current reduces the magnetization of the first permanent magnet 22 with low coercive force, so that the magnetic field inside the permanent magnet motor 100 is reduced to meet the requirements, thus realizing the permanent magnet motor 100
  • the intensity of the magnetic field is adjustable, so that the permanent magnet motor 100 achieves the efficiency when taking into account both high frequency and low frequency.
  • each second permanent magnet 23 is arranged in series between its two adjacent first permanent magnets 22, and the direction of its magnetic force lines is shown in FIG. 2 because the coercive force of the second permanent magnet 23 is greater than that of the first permanent magnet 22 Coercive force, when the second permanent magnet 23 and the first permanent magnet 22 are arranged in series, the demagnetization resistance of the first permanent magnet 22 with low coercive force can be improved; meanwhile, due to the permanent magnet motor 100 in this embodiment, the When a permanent magnet 22 is magnetized (see FIG. 1 for the direction of the magnetic field lines), the two first permanent magnets 22 without the second permanent magnet 23 in the middle are directly magnetized, thus avoiding the second permanent magnet with high coercive force 23. The magnetization current is reduced, which greatly reduces the difficulty of magnetization.
  • the even-numbered first magnetic steel slots 211 are evenly spaced along the circumferential direction of the rotor core 21, and accordingly, the even-numbered first permanent magnets 22 are also evenly spaced along the circumferential direction of the rotor core 21 .
  • the center of the pattern formed by connecting the even number of first permanent magnets 22 coincides with the center of the rotor core 21.
  • the cross section of the first permanent magnet 22 is rectangular, that is, the first permanent magnet 22 is elongated along the circumferential direction of the rotor core 21, and then an even number of first permanent magnets 22 are formed by connecting lines
  • the figure of is a regular polygon whose center coincides with the center of the rotor core 21.
  • the magnetic pole direction of the first permanent magnet 22 is arranged along the radial direction of the rotor core 21.
  • the cross-sectional shape of the first permanent magnet 22 may also be selected from other shapes, for example, the cross-sectional shape of the first permanent magnet 22 is a circular arc shape toward the center of the rotor core 21, That is, the first permanent magnets 22 in the circumferential direction of the rotor core 21 are arc-shaped.
  • the pattern formed by connecting the even number of first permanent magnets 22 is a circle.
  • the center of the circle and the rotor core 21 are circular. The centers are coincident and are not limited here.
  • each adjacent two first permanent magnets 22 have an included angle facing the center of the rotor core 21, and the second permanent magnets 23 are disposed within the included angle to ensure the overall separation of the second permanent magnets 23 Located inside the first permanent magnet 22.
  • each first permanent magnet 22 adjacent to each second permanent magnet 23 are arranged symmetrically compared to the second permanent magnets 23.
  • each first permanent magnet 22 has the same degree of magnetization, so the torque ripple of the permanent magnet motor 100 is small.
  • the cross-sectional shape of the second permanent magnet 23 is rectangular, that is, the second permanent magnet 23 is elongated along the circumferential direction of the rotor core 21.
  • the magnetic pole direction of the second permanent magnet 23 is arranged along the tangential direction of the rotor core 21.
  • the magnetic pole direction of the first permanent magnet 22 may not be arranged along the radial direction of the rotor core 21, for example, the magnetic pole direction of the first permanent magnet 22 is set compared to the diameter of the rotor core 21 Inclined, but this will cause the first permanent magnet 22 to be asymmetrical, which will increase the torque ripple and noise problems; at the same time, the magnetic pole direction of the second permanent magnet 23 may not be arranged along the tangential direction of the rotor core 21, such as The direction of the magnetic pole of the second permanent magnet 23 is inclined compared to the tangential direction of the rotor core 21, which will cause the magnetic poles of the two adjacent first permanent magnets 22 to be different, and at the same time will cause increased torque ripple and noise problem.
  • a part of the magnetic lines between every two adjacent second permanent magnets 23 in the circumferential direction of the rotor core 21 communicates to form a magnetic circuit.
  • the extra magnetic field generated by the second permanent magnet 23 with high coercive force can directly go to the magnetic poles of other second permanent magnets 23 to form a magnetic circuit.
  • the magnetic resistance of the magnetic circuit is small, so the influence on the first permanent magnet 22 having a low coercive force is small, and the magnetization range of the permanent magnet motor 100 is larger.
  • the size selection of the second permanent magnet 23 and the first permanent magnet 22 should satisfy the following relationship: 0.6 * L1 * Br1 ⁇ L2 * Br2 ⁇ 1.1 * L1 * Br1, 0.5 * d1 ⁇ d2 ⁇ 0.8 * d1.
  • the axial end surface of the rotor core 21 is provided with a magnetic isolation slot 213, which is located at both ends of the first magnetic steel slot 211 along the circumferential direction of the rotor core 21, that is, the magnetic isolation slot 213 is located at both ends of the first permanent magnet 22 along the circumferential direction of the rotor core 21, and plays a certain role of magnetic isolation.
  • An embodiment of the present application further provides a motor rotor 20 included in the permanent magnet motor 100 described above.
  • the motor rotor 20 and the permanent magnet motor 100 provided in the embodiments of the present application have the following beneficial effects:
  • the motor rotor 20 includes a first permanent magnet 22 and a second permanent magnet 23 having different coercive forces.
  • the coercive force of the second permanent magnet 23 is greater than that of the first permanent magnet 22, and each second permanent magnet 23
  • the interval is set between every two adjacent pairs of first permanent magnets 22, and the first permanent magnets 22 with low coercive force are magnetized and saturated or the magnetization of the first permanent magnets 22 with low coercive force is reduced by changing the magnetizing current
  • the degree allows the magnetic field inside the permanent magnet motor 100 to meet the requirements, so that the strength of the magnetic field of the permanent magnet motor 100 is adjustable, so that the permanent magnet motor 100 achieves the efficiency when taking into account high frequency and low frequency;
  • Each second permanent magnet 23 having a high coercive force is arranged in series between its adjacent two first permanent magnets 22 having a low coercive force, which increases the demagnetization resistance of the first permanent magnet 22;
  • the two first permanent magnets 22 adjacent to each second permanent magnet 23 are arranged symmetrically compared to the second permanent magnets 23, so that each first permanent magnet 22 has the same degree of magnetization, so the permanent magnet motor 100 The torque ripple is small.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

L'invention concerne un rotor de moteur (20) et un moteur à aimant permanent (100). Le rotor de moteur comprend : un noyau de fer de rotor (21) ; un nombre pair de premiers aimants permanents (22) disposés sur une face d'extrémité axiale du noyau de fer de rotor (21) à des intervalles dans une direction circonférentielle du noyau de fer de rotor (21) ; et au moins deux seconds aimants permanents (23), la force coercitive d'un second aimant permanent (23) étant supérieur à celle d'un premier aimant permanent (22), chacun des seconds aimants permanents (23) étant agencé à des intervalles entre chaque deux paires adjacentes des premiers aimants permanents (22), et chacun des seconds aimants permanents (23) étant conçu pour être connecté en série avec deux premiers aimants permanents adjacents (22) associés. En utilisant un courant de magnétisation pour modifier la force de champ magnétique des premiers aimants permanents (22) ayant une faible force coercitive, un champ magnétique réglable du moteur à aimant permanent (100) est atteint, de telle sorte que le moteur à aimant permanent (100) prend en compte l'efficacité à des fréquences élevées et basses. En même temps, lorsque le premier aimant permanent (22) est magnétisé, les deux premiers aimants permanents (22), entre lesquels il n'y a pas de second aimant permanent (23), sont directement magnétisés, afin d'éviter que le second aimant permanent (23) ait une force coercitive élevée, ce qui réduit le courant de magnétisation, et réduit grandement la difficulté de magnétisation.
PCT/CN2019/103972 2018-11-01 2019-09-02 Rotor de moteur et moteur à aimant permanent WO2020088085A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201811295287.XA CN109067045B (zh) 2018-11-01 2018-11-01 电机转子及永磁电机
CN201811295287.X 2018-11-01

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WO2020088085A1 true WO2020088085A1 (fr) 2020-05-07

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WO (1) WO2020088085A1 (fr)

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CN109067045B (zh) * 2018-11-01 2024-05-17 珠海格力电器股份有限公司 电机转子及永磁电机
CN113964981B (zh) * 2021-11-11 2022-10-28 东南大学 一种混合永磁转子自漏磁型可变磁通记忆电机

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CN208955768U (zh) * 2018-11-01 2019-06-07 珠海格力电器股份有限公司 电机转子及永磁电机

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JP5161612B2 (ja) * 2008-02-22 2013-03-13 株式会社東芝 永久磁石式回転電機、永久磁石式回転電機の組立方法及び永久磁石式回転電機の分解方法
WO2017023250A1 (fr) * 2015-07-31 2017-02-09 Nissan Motor Co., Ltd. Moteur synchrone à aimants permanents
CN107994702B (zh) * 2017-12-21 2019-04-30 珠海格力电器股份有限公司 电机转子和永磁电机
CN108023421B (zh) * 2017-12-21 2024-05-28 珠海格力电器股份有限公司 电机转子和永磁电机

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Publication number Priority date Publication date Assignee Title
CN203896066U (zh) * 2013-12-25 2014-10-22 联合汽车电子有限公司 混合磁钢转子及具有该转子的永磁同步电机
CN105990922A (zh) * 2015-01-29 2016-10-05 珠海格力节能环保制冷技术研究中心有限公司 转子及具有其的切向式永磁同步电机
US20180183289A1 (en) * 2016-09-16 2018-06-28 Kabushiki Kaisha Toshiba Rotary electric machine and vehicle
CN108110980A (zh) * 2018-01-31 2018-06-01 哈尔滨工业大学 半串联型具有被动调磁磁障的混合永磁可调磁通电机
CN108599418A (zh) * 2018-05-16 2018-09-28 华中科技大学 一种磁路串联型混合永磁可控磁通电机的转子铁芯及电机
CN109067045A (zh) * 2018-11-01 2018-12-21 珠海格力电器股份有限公司 电机转子及永磁电机
CN208955768U (zh) * 2018-11-01 2019-06-07 珠海格力电器股份有限公司 电机转子及永磁电机

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