WO2022121277A1 - Rotor de moteur synchrone à aimants permanents segmenté asymétrique en forme de u - Google Patents

Rotor de moteur synchrone à aimants permanents segmenté asymétrique en forme de u Download PDF

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Publication number
WO2022121277A1
WO2022121277A1 PCT/CN2021/101100 CN2021101100W WO2022121277A1 WO 2022121277 A1 WO2022121277 A1 WO 2022121277A1 CN 2021101100 W CN2021101100 W CN 2021101100W WO 2022121277 A1 WO2022121277 A1 WO 2022121277A1
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WIPO (PCT)
Prior art keywords
magnetic steel
permanent magnet
magnetic
axis
combination
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PCT/CN2021/101100
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English (en)
Chinese (zh)
Inventor
林德芳
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上海特波电机有限公司
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Publication of WO2022121277A1 publication Critical patent/WO2022121277A1/fr

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    • 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]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
    • H02K2201/06—Magnetic cores, or permanent magnets characterised by their skew
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Definitions

  • the invention relates to motor technology, in particular to the technology of a U-shaped asymmetric segmented permanent magnet synchronous motor rotor.
  • Electric vehicles are an important way to solve the energy crisis and environmental pollution.
  • the drive motor for electric vehicles restricts the development and industrialization of electric vehicles in China.
  • the permanent magnet synchronous motor suitable for electric vehicles there are defects such as large torque fluctuation, narrow high-speed constant power range and poor reliability, which are difficult to meet the requirements.
  • the permanent magnet poles of the rotor of the existing built-in permanent magnet synchronous motor are all symmetrical structures.
  • the magnetic steels are symmetrically arranged relative to the d-axis (magnetic pole axis), and the two ends of the magnetic steel are provided with magnetic isolation slots.
  • the magnetic isolation slot is actually a non-magnetic magnetic flux barrier, which plays the role of magnetic isolation and suppression of leakage flux.
  • the area between the magnetic isolation slot at the outer end of the magnetic steel and the outer peripheral surface of the rotor core forms a magnetic conduction bridge, and the magnetic steel and the rotor The yokes form symmetrical permanent magnet poles.
  • the characteristic of the rotor with symmetrical permanent magnetic pole structure is that the d-axis permanent magnetic flux density is high, so that the radial force generated by the d-axis part and the stator tooth surface is large, while the q-axis (interpole axis) permanent magnetic flux density is low, The radial force generated by the q-axis part and the stator tooth surface is small. Due to the difference and change of the radial force generated by the d-axis and q-axis parts and the stator tooth surface, the motor will generate large mechanical vibration, noise and rotation during operation. moment fluctuations.
  • the technical problem to be solved by the present invention is to provide a U-shaped asymmetric splitter that can reduce torque fluctuation caused by cogging, thereby reducing mechanical vibration, noise and expanding the range of high-speed constant power.
  • segment permanent magnet synchronous motor rotor segment permanent magnet synchronous motor rotor.
  • a U-shaped asymmetric segmented permanent magnet synchronous motor rotor provided by the present invention includes a rotor iron core, and a plurality of permanent magnet units are arranged on the rotor iron core, and each permanent magnet unit surrounds the rotor.
  • the iron core is arranged symmetrically on the axis; it is characterized by:
  • the permanent magnet unit includes a single magnetic steel, a first magnetic steel combination, and a second magnetic steel combination, and the first magnetic steel combination and the second magnetic steel combination are each composed of two magnetic steel segments with different widths;
  • the single magnetic steel is arranged on the counterclockwise side of the d-axis, and the second magnetic steel combination is arranged on the clockwise side of the d-axis.
  • the first magnetic steel combination is arranged in the narrow mouth of the figure eight;
  • the two magnetic steel segments are arranged in a line shape perpendicular to the d-axis, and the width of the counterclockwise side magnetic steel segment is greater than the width of the clockwise side magnetic steel segment, and the two Each magnetic steel segment is placed in two mutually isolated permanent magnet slots;
  • the width of the magnetic steel segment near the d-axis side is greater than the width of the magnetic steel segment near the q-axis side, and the two magnetic steel segments are placed in two mutually isolated permanent magnet slots.
  • the inner and outer ends of the magnetic steel unit are provided with magnetic isolation grooves, and the outer end of the magnetic steel segment near the q-axis side and the inner end of the magnetic steel segment near the d-axis side in the second magnetic steel combination are provided with Magnetic isolation slot.
  • the U-shaped asymmetric segmented permanent magnet synchronous motor rotor provided by the present invention adopts a built-in unequal width magnetic steel segment structure, and forms an asymmetric permanent magnet magnetic pole with the pole piece, and obtains the stator core inclined slot and the rotor permanent magnet.
  • the magnetic pole slanted pole, the uneven air gap between the stator and the rotor and other measures with complex structure and the same effect can reduce the torque fluctuation caused by the cogging, so that the d axis of the radial center line of the magnetic pole and the q axis of the center line between the poles have the same effect.
  • the radial force tends to be balanced, reducing the centrifugal force of the rotor, reducing the mechanical vibration, noise and back EMF harmonics, reducing the loss of the iron core, and overcoming the disadvantages of the inclined slot and the inclined pole; and the two magnetic steels in the same magnetic steel combination
  • the segments are placed in two mutually isolated permanent magnet slots, thereby forming a magnetic conductive bridge between the two magnetic steel segments.
  • the existence of the magnetic conductive bridge between the magnetic steel segments provides additional magnetic flux paths on the one hand. , which improves the constant power expansion capacity of the motor in the high-speed area.
  • it is equivalent to the reinforcing rib of the rotor, which resists the high-speed centrifugal force and improves the overload capacity, which is conducive to the frequent start of the motor.
  • FIG. 1 is a radial cross-sectional view of a rotor of a U-shaped asymmetric segmented permanent magnet synchronous motor according to an embodiment of the present invention.
  • a U-shaped asymmetric segmented permanent magnet synchronous motor rotor provided by an embodiment of the present invention includes a rotor iron core 1, and a plurality of permanent magnet units are arranged on the rotor iron core, and each permanent magnet The units are arranged symmetrically around the axis of the rotor core; it is characterized by:
  • the permanent magnet unit includes a magnetic steel unit 4, a first magnetic steel combination, and a second magnetic steel combination.
  • the first magnetic steel combination is composed of two magnetic steel segments 21 and 22 with different widths (the The length direction is parallel to the axial direction of the rotor core), and the second magnetic steel combination is composed of two magnetic steel segments 31 and 32 with different widths;
  • the magnetic steel unit 4 is arranged on the counterclockwise side of the d-axis, and the second magnetic steel combination is arranged on the clockwise side of the d-axis.
  • Figure-eight shape (the side facing the rotor core axis is the inner side), and the first magnetic steel combination is arranged in the narrow mouth of the figure-eight shape;
  • the two magnetic steel segments 21 and 22 are arranged in a line shape perpendicular to the d-axis (magnetic pole axis), and the width of the counterclockwise side magnetic steel segment 21 is larger than that of the clockwise side magnetic steel.
  • the width of the segment 22, and the two magnetic steel segments 21, 22 are placed in two mutually isolated permanent magnet slots;
  • the width of the magnetic steel segment 31 on the proximal d-axis side is greater than the width of the magnetic steel segment 32 on the near q-axis side, and the two magnetic steel segments 31 and 32 are placed on two sides of each other.
  • the partitioned permanent magnet slot In the partitioned permanent magnet slot;
  • the inner and outer ends of the magnetic steel unit 4 are provided with magnetic isolation grooves 5, and the outer end of the magnetic steel segment 32 on the near-q-axis side and the inner side of the magnetic steel segment 31 on the near-d-axis side in the second magnetic steel combination. Both ends are provided with magnetic isolation slots 5 .
  • Cogging torque also known as reluctance torque
  • the built-in permanent magnet motor has a small effective air gap, and the cogging torque has a greater impact on the output.
  • oblique slot or oblique pole is the most commonly used method to reduce torque fluctuation, but stator oblique slot complicates production process and structure, reduces stator slot area, reduces output, and increases copper consumption. Both the inclined slot and the inclined pole reduce the output, and complicate the process and structure of the motor, and increase the manufacturing cost of the motor.
  • the high-precision speed control system has strict requirements on the cogging torque fluctuation, because in the speed control system, when the frequency of the motor torque is consistent with the mechanical resonance frequency of the stator or rotor, the vibration and noise generated by the cogging torque are significantly reduced. Amplification also affects low speed performance and positioning accuracy.
  • the magnetic steel unit 4 the first magnetic steel combination, and the second magnetic steel combination are arranged in a U-shape as a whole, and the magnetic steel and the pole piece (rotor iron core) are asymmetrically arranged relative to the d-axis.
  • the permanent magnetic poles have the same effect as the stator core inclined slots, the rotor permanent magnetic pole inclined poles, the uneven air gap between the stator and the rotor and other measures with complex processes and structures, which can reduce the torque fluctuation caused by the cogging.
  • the effect reduces the change of the air-gap permeance, thereby reducing the change of the energy storage of the air-gap magnetic field when the rotor rotates, so that the radial force between the d-axis and the q-axis (interpole axis) tends to balance, and the cogging is weakened.
  • Torque cogging torque, also known as reluctance torque, is a fatal defect in the electric vehicle drive system); and also suppresses torque fluctuations caused by cogging, significantly reducing the noise, mechanical vibration and stator noise when the rotor runs at high speed
  • the deformation of the iron core, especially the harmonic components of the back EMF can effectively reduce the total harmonic distortion THD of the back EMF, which is beneficial to the frequent starting of the motor, and improves the efficiency, overload capacity and power density; it overcomes the disadvantages of the inclined slot and the inclined pole.
  • the permanent magnet slots embedded in the unequal width magnets in the embodiment of the present invention do not penetrate each other and have intervals to form a magnetic conductive bridge,
  • the motor in the embodiment of the present invention adopts a built-in unequal-width magnetic steel segment structure, and forms an asymmetric permanent magnetic pole with the pole piece (the local area of the rotor core), which can reduce the torque fluctuation caused by the cogging and make the magnetic pole
  • the radial force of the d-axis of the radial centerline and the q-axis of the interpole centerline tends to balance, reducing the centrifugal force of the rotor, reducing mechanical vibration, noise and back EMF harmonics, and reducing core loss.
  • the torque fluctuation of the permanent magnet synchronous motor comes from the cogging torque generated by the interaction between the magnetic steel and the stator teeth, the induced electromotive force waveform, and the ripple torque generated by the harmonics contained in the current waveform.
  • the magnetic synchronous motor has a wider constant power speed range, realizes the characteristics of high efficiency, high reliability, wide speed regulation, low noise, low fluctuation and smooth operation of the motor, effectively improves the comprehensive performance of the motor, and meets the driving requirements of electric and hybrid vehicles.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Abstract

Rotor de moteur synchrone à aimants permanents segmenté asymétrique en forme de U, se rapportant au domaine technique des moteurs. Un noyau de fer de rotor du rotor comprend une pluralité d'unités d'aimants permanents ; les unités d'aimants permanents sont symétriquement disposées autour de l'axe du noyau de fer de rotor ; chaque unité d'aimants permanents comprend une unité d'acier magnétique, une première combinaison d'acier magnétique et une seconde combinaison d'acier magnétique ; chacune de la première combinaison d'acier magnétique et de la seconde combinaison d'acier magnétique est composée de deux segments d'acier magnétique présentant des largeurs différentes ; l'unité d'acier magnétique et la seconde combinaison d'acier magnétique sont agencées sous la forme d'un caractère chinois « 八 » présentant une ouverture étroite vers l'intérieur ; la première combinaison d'acier magnétique est disposée au niveau de la partie ouverture étroite de la forme ; les deux segments d'acier magnétique dans la première combinaison d'acier magnétique sont agencés en une ligne droite perpendiculaire à un axe d, et sont respectivement agencés dans deux fentes d'aimant permanent qui sont séparées l'une de l'autre ; les deux segments d'acier magnétique dans la seconde combinaison d'acier magnétique sont également disposés respectivement dans deux fentes d'aimant permanent qui sont séparées l'une de l'autre ; des fentes d'isolation magnétique sont formées sur les extrémités intérieures et les extrémités extérieures des unités d'acier magnétique et des secondes combinaisons d'acier magnétique. Le rotor de la présente invention peut réduire une ondulation de couple de détente.
PCT/CN2021/101100 2020-12-09 2021-06-18 Rotor de moteur synchrone à aimants permanents segmenté asymétrique en forme de u WO2022121277A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202011426300.8 2020-12-09
CN202011426300.8A CN112271845A (zh) 2020-12-09 2020-12-09 U型不对称分段永磁同步电机转子

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116742856A (zh) * 2023-07-03 2023-09-12 山东理工大学 一种带有圆弧形隔磁障的磁场分布可调电机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112271845A (zh) * 2020-12-09 2021-01-26 上海特波电机有限公司 U型不对称分段永磁同步电机转子

Citations (7)

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Publication number Priority date Publication date Assignee Title
WO2011128842A2 (fr) * 2010-04-15 2011-10-20 Brusa Elektronik Ag Procédé et dispositif permettant la magnétisation de pièces en matériau magnétique d'un rotor dans une machine synchrone à excitation permanente, et rotor pour une telle machine synchrone
JP2013207943A (ja) * 2012-03-29 2013-10-07 Hitachi Industrial Equipment Systems Co Ltd 永久磁石同期機
CN104600890A (zh) * 2014-11-25 2015-05-06 珠海格力节能环保制冷技术研究中心有限公司 电机转子及具有其的电机
JP2017169318A (ja) * 2016-03-15 2017-09-21 ダイキン工業株式会社 ロータ
CN110233530A (zh) * 2019-07-17 2019-09-13 上海川也电机有限公司 U型复合永磁电机
CN112271845A (zh) * 2020-12-09 2021-01-26 上海特波电机有限公司 U型不对称分段永磁同步电机转子
CN213585324U (zh) * 2020-12-09 2021-06-29 上海特波电机有限公司 U型不对称分段永磁同步电机转子

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011128842A2 (fr) * 2010-04-15 2011-10-20 Brusa Elektronik Ag Procédé et dispositif permettant la magnétisation de pièces en matériau magnétique d'un rotor dans une machine synchrone à excitation permanente, et rotor pour une telle machine synchrone
JP2013207943A (ja) * 2012-03-29 2013-10-07 Hitachi Industrial Equipment Systems Co Ltd 永久磁石同期機
CN104600890A (zh) * 2014-11-25 2015-05-06 珠海格力节能环保制冷技术研究中心有限公司 电机转子及具有其的电机
JP2017169318A (ja) * 2016-03-15 2017-09-21 ダイキン工業株式会社 ロータ
CN110233530A (zh) * 2019-07-17 2019-09-13 上海川也电机有限公司 U型复合永磁电机
CN112271845A (zh) * 2020-12-09 2021-01-26 上海特波电机有限公司 U型不对称分段永磁同步电机转子
CN213585324U (zh) * 2020-12-09 2021-06-29 上海特波电机有限公司 U型不对称分段永磁同步电机转子

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116742856A (zh) * 2023-07-03 2023-09-12 山东理工大学 一种带有圆弧形隔磁障的磁场分布可调电机
CN116742856B (zh) * 2023-07-03 2024-05-31 山东理工大学 一种带有圆弧形隔磁障的磁场分布可调电机

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