WO2017202318A1 - Plaque de découpage pour rotor de moteur, rotor de moteur, moteur et véhicule électrique - Google Patents

Plaque de découpage pour rotor de moteur, rotor de moteur, moteur et véhicule électrique Download PDF

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Publication number
WO2017202318A1
WO2017202318A1 PCT/CN2017/085590 CN2017085590W WO2017202318A1 WO 2017202318 A1 WO2017202318 A1 WO 2017202318A1 CN 2017085590 W CN2017085590 W CN 2017085590W WO 2017202318 A1 WO2017202318 A1 WO 2017202318A1
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WO
WIPO (PCT)
Prior art keywords
magnetic steel
rotor
motor
groove
electric machine
Prior art date
Application number
PCT/CN2017/085590
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English (en)
Chinese (zh)
Inventor
马冰青
吴施汛
齐文明
Original Assignee
比亚迪股份有限公司
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Filing date
Publication date
Application filed by 比亚迪股份有限公司 filed Critical 比亚迪股份有限公司
Publication of WO2017202318A1 publication Critical patent/WO2017202318A1/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
    • 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
    • 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
    • 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 present invention relates to the field of motor technology, and in particular to a motor rotor chip, a motor rotor having the chip, and a motor having the motor rotor and an electric vehicle having the same.
  • a motor mainly includes a housing, a stator assembly, and a rotor assembly.
  • the outer casing includes a cylinder having an opening at the front end, a stator assembly is disposed in the outer casing, the stator assembly includes a stator core and a core winding, and the rotor assembly includes a rotating shaft, a permanent magnet and a rotor core;
  • the core is set on the rotating shaft, and the rotor core is uniformly provided with a plurality of permanent magnets on the outer circumference;
  • the front end of the outer casing is provided with an end surface, and the upper end of the outer casing is provided with a junction box to supply power to the winding.
  • An object of the present invention is to provide a rotor for motor rotor, a rotor for a motor having the rotor of the motor, a motor having the rotor of the motor, and an electric vehicle having the same.
  • the present invention provides a rotor sheet for an electric machine, comprising a punching body, on which a magnetic steel groove for magnetic steel insertion is formed, the magnetic steel groove along a surface of the punching body
  • the direction has a straight slot section and a dip angle section on either side of the straight slot section, the first side edge of the dimple section away from the center of rotation of the punch body body being inclined outwardly from the end of the straight slot section.
  • the present invention also provides an electric machine rotor including a rotor core formed by stacking a plurality of rotor punches, the rotor blank being the motor rotor punch provided by the present invention.
  • the present invention also provides an electric machine including a housing, a motor rotor mounted in the housing, and a motor stator, the motor rotor being the motor rotor provided by the present invention.
  • the present invention also provides an electric vehicle including a drive motor which is the motor provided by the present invention.
  • a buffer zone for generating a small deformation can be provided for both ends of the magnetic steel in the magnetic steel groove, that is, the magnetic steel is allowed to be magnetic when the rotor rotates.
  • the slight deformation in the steel trough releases the tensile stress generated inside the magnetic steel, which in turn improves the life of the magnetic steel, and is especially suitable for ultra-high speed operation in electric vehicles. Drive the motor.
  • FIG. 1 is a first perspective view of a motor according to an embodiment of the present invention
  • FIG. 2 is a second perspective view of a motor according to an embodiment of the present invention.
  • FIG. 3 is an exploded perspective view of a motor according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural view of a rotor of a motor according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural view of a magnetic steel trough provided by an embodiment of the present invention, wherein in order to clearly show the angle, the angle is enlarged by several times when other features are unchanged;
  • Fig. 6 is a schematic structural view of an electric vehicle according to an embodiment of the present invention.
  • orientation words such as “up, down, left, and right” are generally defined on the basis of the drawing direction of the drawing, and the "inside and outside” means correspondingly. Inside and outside of the contour of the part.
  • the present invention provides at least an electric motor rotor punch, an electric motor rotor, an electric motor 1000, and an electric vehicle 2000.
  • the motor 1000 can be a two-pole motor, a permanent magnet synchronous motor, or a two-pole permanent magnet synchronous motor, and the motor of the present invention can also be other types of motors known in the art, such as an asynchronous motor or the like.
  • an ultra-high speed motor that is, a motor having a rotational speed of more than 20,000 rpm (revolutions per minute)
  • the various motors mentioned in the present invention are also particularly suitable for use in a drive motor of an electric vehicle.
  • two-pole and “permanent magnet synchronization” as used in the present invention are terms well known in the art.
  • two pairs of poles mean that two pairs of magnetic poles are disposed on the rotor of the motor.
  • the more the number of magnetic pole pairs, when the motor speed is high, especially when the motor in the present invention is an ultra-high speed motor the higher the alternating frequency of the magnetic field, the more heat generated by the motor, and the requirements for the cooling system are also The higher the speed, the higher the iron consumption of the motor. Therefore, the use of two pole motors is more suitable for use in ultra-high speed running motors.
  • three pairs of poles or four pairs of poles may also be used.
  • permanent magnet synchronous motors are also more suitable for use in electric motor drive motors. In terms of performance, it may include the advantages of high efficiency, high power factor, small volume, light weight, and low temperature rise. Specifically, for example, after the permanent magnet is embedded in the permanent magnet, the rotor magnetic field is established by the permanent magnet, and the rotor and the stator magnetic field are synchronously operated during normal operation, and the rotor There is no induced current in the middle, and there is no rotor resistance loss, so the motor efficiency can be greatly improved. In addition, when starting, the motor has a sufficiently large starting torque and does not require a large starting current, and is suitable for a driving motor driven by a power battery pack.
  • the permanent magnet synchronous motor has high efficiency, the resistance loss in the rotor winding is low, and there is little or no reactive current in the stator winding, which makes the motor temperature rise low, and can also prolong the service life of the motor.
  • the advantages brought by other permanent magnet synchronous motors are not described too much.
  • the permanent magnet synchronous motor has a simple structure, which reduces the processing and distribution cost of the permanent magnet synchronous motor and makes the operation more reliable.
  • the permanent magnet synchronous motor uses the rare earth permanent magnet to increase the air gap magnetic density and improve the motor speed. To the best, the volume of the motor is significantly reduced, and the power-to-mass ratio is improved. In addition, the motor efficiency is significantly improved by eliminating the excitation copper loss.
  • the motor provided by the embodiment of the present invention includes a housing 400, a motor rotor 300 and a motor stator 500 installed in the housing 400, and the motor stator 500 is fixed in the housing 400.
  • the motor rotor 300 is rotatably disposed at the center of the motor stator 500.
  • the motor rotor 300 includes a rotor core 310 formed by stacking a plurality of rotor blades, and a rotating shaft 320 coupled to the rotor core 310.
  • the center of rotation of the punch body 100 of the rotor core is formed with a shaft hole 101, and a pair of keys 102 for engaging the rotating shaft, that is, rotor iron, are symmetrically formed on the side wall of the shaft hole 101.
  • the core 310 and the rotating shaft 320 are in a key connection manner.
  • the rotor core 310 and the rotating shaft 320 may also be connected by other transmission connections known to those skilled in the art, for example, using a non-circular cross-section connection.
  • an oil hole 103 may be formed in the rotor punch to form a part of the rotor oil passage, and the lubricant may be cooled by flowing the lubricating oil in the rotor.
  • the housing 400 has an end cover 800 away from the power output end.
  • the end cover 800 may be formed with a bearing chamber.
  • the inner end of the rotating shaft 320 is installed in the bearing chamber through the deep groove ball bearing 600, and protrudes from the outer end of the housing 400. It can be used as a power output.
  • the junction box 700 mounted on the housing can be externally connected to a power source, for example, electrically connected to the power battery pack to generate a magnetic field for powering the winding 900, thereby enabling operation of the motor.
  • an air gap is provided between the rotor and the stator of the motor to enable the motor to operate normally.
  • the motor rotor blank provided includes a punch body 100 having a magnetic steel groove 200 for magnetic steel insertion formed thereon, that is, using magnetic steel as
  • the permanent magnets form the rotor poles, that is, the permanent magnets in the embodiment adopt an embedded mounting manner, which can effectively ensure the stability of the rotor when rotating at an ultra-high speed, compared with the surface-mounted permanent magnet mounting method, embedded
  • the permanent magnet mounting method is more suitable for rotors that operate at very high speeds.
  • the magnetic steel accommodated in the magnetic steel tank will have a tendency to deform under the action of centrifugal force, that is, tensile stress is generated inside the magnetic steel, and at the same time, the pressure is resisted due to the resistance of the magnetic steel groove.
  • Stress in which the tensile strength of the magnetic steel is much lower than its compressive strength.
  • the tensile strength is only 85 MPa, and the compressive strength can be above 1000 MPa.
  • the resulting tensile stress can affect the life of the magnetic steel.
  • the groove shape of the magnetic steel groove is improved, and the manner may include converting the tensile stress received by the magnetic steel into a compressive stress.
  • the magnetic steel groove 200 has a straight groove section 201 and a dip angle section 202 on both sides of the straight groove section 201 along the surface direction of the punching body 100, and the dip angle section 202 is away from the center of rotation of the punching body 100.
  • the first side edge is inclined outward from the end of the straight groove section 201.
  • the straight slot section 201 and the angled section 202 on either side of the straight slot section 201 together form a closed cross-sectional profile of the magnetic steel slot 200 on the surface of the die body 100.
  • the closed cross-sectional profile of the magnetic steel groove 200 at the surface of the punch body 100 is divided by a broken line into a straight groove segment 201 and a dip segment 202.
  • a buffer zone for generating a slight deformation can be provided for both ends of the magnetic steel in the magnetic steel groove 200, that is, the magnetic steel is allowed to be in the magnetic steel when the rotor rotates.
  • a slight deformation in the groove 200 releases the tensile stress generated inside the magnetic steel, which in turn increases the life of the magnetic steel.
  • an angle can be formed on the existing one-shaped magnetic steel groove.
  • the angle ⁇ between the first side edge of the inclined section 202 and the straight groove section 201 is 0.5 ° - 2 °, for example with a 1 ° tilt.
  • FIG. 5 is a view in which the angle ⁇ is enlarged several times in the case where other features are not changed, to clearly show the inclination section 202. This improvement in the magnetic steel tank 200 can effectively increase the life of the magnetic steel.
  • the punch body 100 is made of an amorphous alloy material, that is, the rotor core in the embodiment of the present invention is made of an amorphous alloy material, and the strength of the punch body 100 can be increased.
  • the tensile strength of the characteristics of the amorphous alloy material is several tens of times that of the ordinary silicon steel material, so that the improvement of the magnetic steel groove 200 causes the strength sacrificed by the punch body 100 to be compensated by the material, and its strength is greatly increased. It is higher than the strength of the rotor sheet of the prior art silicon steel material, thereby ensuring the life of the magnetic steel and ensuring the strength and life of the rotor core.
  • the rotor core is made of an amorphous alloy material
  • the rotor core has the characteristics of high magnetic permeability, high electrical conductivity, small eddy current loss, and the like, and the performance of the motor is greatly improved.
  • the use of amorphous alloy material to make the rotor core can not only improve the rotor capacity, but also solve the key problem of how to achieve high power output through a small volume, enabling the drive motor in the electric vehicle field. Great progress has been made.
  • the inventor of the present invention has a design idea that the inventors have found that in the field of electric vehicles, it is difficult to increase the volume of the motor due to the space layout, and thus it is difficult to increase the torque of the motor.
  • the inventors also considered that when the motor speed reached an ultra-high speed of 20,000 rpm, it was limited by the yield strength of ordinary silicon steel sheets, and the designed motor volume would be too small. When the motor volume is too small, although the rotation speed is high, it will directly affect the torque output of the motor, which cannot meet the requirements of the drive motor.
  • the inventors of the present application have adopted an amorphous alloy material to form a rotor to solve the problem that the outer diameter of the rotor is limited, that is, to ensure that the motor can be operated at an ultra-high speed while increasing the volume of the motor as much as possible to increase the torque. Further increase the motor power. Further, the motor provided by the present invention does not simply manufacture all components using an amorphous alloy material. Except for the cost factor, the present invention also finds that under the current process conditions, the width of the amorphous alloy strip is limited. If the amorphous alloy strip is used as the motor stator, the produced motor is too small and affects the power of the motor. Output.
  • the various motors provided by the embodiments of the present invention only make the rotor core made of amorphous alloy material, and the stator can be made of silicon steel material. Therefore, in the embodiment of the present invention, the structure in which the rotor is made of an amorphous alloy material and the stator is made of the original silicon steel material is a result of comprehensive consideration of various factors, and the inventor needs a lot of creative labor.
  • the present invention skillfully uses an amorphous alloy material for the manufacture of a rotor, which not only achieves the beneficial effect of improving the life of the magnetic steel during ultra-high speed operation, but also enables the designed motor to be small in size without being too small, that is,
  • the use of amorphous alloy materials for the manufacture of rotor cores has also produced unexpected technical effects, achieving a variety of effects. Especially suitable for the requirements of high-power and small-volume drive motors, the performance of the drive motor has been greatly improved.
  • the two inclined sections 202 may be designed to be symmetrically disposed with respect to the central axis of the straight groove section 201. That is, the structure of the two dip segments 202 is substantially the same.
  • the second side edge of the inclined section 202 close to the center of rotation of the punch body 100 is arranged in line with the straight groove section 201. That is, only the first side edge line of the outer side of the inclined section is inclined with respect to the straight groove section 201, so that the magnetic steel can be slightly deformed outward at the two ends under the centrifugal force, and the magnetic steel can be better retained.
  • the length of the straight groove section 201 may be designed to account for 1/2 to 3/4 of the length of the magnetic steel accommodated in the magnetic steel groove along the surface of the punching body 100. Thereby, the deformation of the magnetic steel is better buffered, and the magnetic steel groove is prevented from exerting unnecessary destructive force on the magnetic steel.
  • the magnetic steel groove group includes a first magnetic shape symmetrically arranged with respect to a first diameter of the punch body (as a case, the first diameter is a diameter in the vertical direction on the punch body 100, as shown in FIG.
  • the steel trough 210 and the second magnetic steel trough 220, the first magnetic steel trough 210 and the second magnetic steel trough 220 are arranged in a first V-shape that is open to the outside.
  • the magnetic steel of the present invention is arranged in a V-shaped configuration.
  • the magnetic steel groove group further includes a third magnetic steel groove 230 and a fourth magnetic steel groove 240 symmetrically arranged with respect to the first diameter, the third magnetic The steel groove 230 and the fourth magnetic steel groove 240 are arranged in a second V-shape that is open to the outside and are spaced apart from the radially inner side of the first magnetic steel groove 210 and the second magnetic steel groove 220. That is, in the present invention, one magnetic pole may include four magnetic steels, thereby making full use of the space of the punching body, which is especially suitable for a small-sized driving motor.
  • the space is utilized reasonably, and optionally, the angle of the second V-shaped is smaller than the angle of the first V-shaped.
  • the outer magnetic steel can better utilize the space in the chord direction of the punch body, so that the inner magnetic steel can better utilize the space in the radial direction of the punch body, the layout is more reasonable, and the magnetic field is generated more effectively.
  • the plurality of magnetic steel groove groups are respectively configured to constitute a plurality of rotor magnetic poles, and the plurality of magnetic steel groove groups are evenly distributed and uniformly distributed on the punch body in the circumferential direction.
  • the magnetic steel groove group is four to constitute two pairs of poles of the motor rotor.
  • a different number of sets of magnetic steel slots may be provided depending on the number of pole pairs.
  • the punching body 100 is formed with oil holes 103 uniformly distributed in the circumferential direction, and the oil holes 103 are located between adjacent magnetic steel groove groups to fully utilize the punching
  • the sheet body space in addition to the oil hole 103, can reduce the weight of the rotor and reduce the rotor moment of inertia.
  • the center of rotation of the punching main body 100 is formed with a rotating shaft hole 101, and a pair of keys 102 for engaging with the rotating shaft are symmetrically formed on the side wall of the rotating shaft hole 101, and the key 102 is convex toward the center of the circle And the pair of keys 102 are located on the first diameter. That is, the key is a convex structure rather than a concave structure, thereby facilitating the torque transmission in cooperation with the keyway on the rotating shaft.
  • reinforcing ribs are disposed between the symmetrically arranged magnetic steel grooves to enhance the strength of the punch body.
  • a magnetic bridge or a magnetic isolation hole is disposed between the magnetic steel groove and the edge of the punch body.
  • the magnetic bridge can be as small as possible, which will reduce the magnetic flux leakage and increase the air gap magnetic density.
  • the magnetic isolation hole can improve the air gap magnetic density waveform, thereby improving the performance of the motor.
  • the motor provided by the invention is more suitable for the driving motor of the electric vehicle, wherein the iron consumption is relatively low, the output power is improved, and the problem of large noise caused by the amorphous motor is avoided.
  • the stator and rotor structures have been redesigned. Increasing the strength of the rotor structure can not only be made into an ultra-high-speed motor, but also has excellent electromagnetic performance. Only the rotor core uses an amorphous alloy, which reduces the processing difficulty and reduces the cost of the process.
  • the volume of the motor is not limited by the amorphous alloy material, so that it can exert greater torque and power.
  • the alternating frequency of the magnetic field is minimized, the iron loss is reduced, the heat dissipation is reduced, and the control of the motor is easily realized, so that the performance of the motor is significantly improved, and the performance of the electric vehicle is indirectly improved. More practical.

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

Abstract

L'invention concerne une plaque de découpage pour un rotor de moteur, le rotor de moteur, un moteur (1000) et un véhicule électrique (2000). La plaque de découpage pour un rotor de moteur comprend un corps de plaque de découpage (100). Une rainure d'aimant en acier (200) permettant d'insérer un aimant en acier est formée dans le corps de plaque de découpage. La rainure d'aimant en acier est pourvue d'un segment de rainure directe (201) dans la direction de la surface du corps de plaque de découpage et de segments d'angle d'inclinaison (202) situés sur deux côtés du segment de rainure directe. Un premier côté du segment d'angle d'inclinaison éloigné du centre de giration du corps de plaque de découpage s'incline depuis une partie d'extrémité du segment de rainure directe vers l'extérieur. En disposant des segments d'angle d'inclinaison inclinés à l'extérieur sur les deux côtés du segment de rainure directe, un tampon générant une petite déformation peut être prévu pour deux extrémités de l'aimant en acier dans la rainure d'aimant en acier, c'est-à-dire que lorsque le rotor tourne, une faible déformation de l'aimant en acier est permise dans la rainure d'aimant en acier de façon à libérer la contrainte de traînée générée dans l'aimant en acier, et la durée de vie de l'aimant en acier est encore améliorée ; et le moteur est particulièrement applicable à un moteur d'entraînement fonctionnant à très grande vitesse dans le véhicule électrique.
PCT/CN2017/085590 2016-05-27 2017-05-23 Plaque de découpage pour rotor de moteur, rotor de moteur, moteur et véhicule électrique WO2017202318A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610368644.5 2016-05-27
CN201610368644.5A CN107437858B (zh) 2016-05-27 2016-05-27 电机转子冲片、电机转子、电机和电动汽车

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WO2017202318A1 true WO2017202318A1 (fr) 2017-11-30

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WO (1) WO2017202318A1 (fr)

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JP6634458B2 (ja) 2018-01-11 2020-01-22 本田技研工業株式会社 回転電機のロータ
CN108711977A (zh) * 2018-06-25 2018-10-26 苏州汇川联合动力系统有限公司 转子及永磁电机
CN113497501B (zh) * 2020-04-02 2022-07-29 安徽威灵汽车部件有限公司 转子冲片、电机的转子、电机和车辆

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CN205986384U (zh) * 2016-05-27 2017-02-22 比亚迪股份有限公司 两对极电机和电动汽车
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EP1037365A1 (fr) * 1999-03-12 2000-09-20 Isuzu Ceramics Research Institute Co., Ltd. Moteur-Générateur développant un haut couple
CN104242509A (zh) * 2013-06-05 2014-12-24 上海欧普斯达光纤通信设备有限公司 一种永磁复合激磁同步电机转子
CN205829324U (zh) * 2016-05-27 2016-12-21 比亚迪股份有限公司 电机和电动汽车
CN205829322U (zh) * 2016-05-27 2016-12-21 比亚迪股份有限公司 永磁同步电机和电动汽车
CN205986384U (zh) * 2016-05-27 2017-02-22 比亚迪股份有限公司 两对极电机和电动汽车
CN206077183U (zh) * 2016-05-27 2017-04-05 比亚迪股份有限公司 两对极永磁同步电机和电动汽车

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