WO2024099043A1 - Structure de rotor, moteur électrique à aimants permanents et utilisation - Google Patents

Structure de rotor, moteur électrique à aimants permanents et utilisation Download PDF

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Publication number
WO2024099043A1
WO2024099043A1 PCT/CN2023/125231 CN2023125231W WO2024099043A1 WO 2024099043 A1 WO2024099043 A1 WO 2024099043A1 CN 2023125231 W CN2023125231 W CN 2023125231W WO 2024099043 A1 WO2024099043 A1 WO 2024099043A1
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WIPO (PCT)
Prior art keywords
permanent magnet
diffusion zone
diffusion
maximum length
2max
Prior art date
Application number
PCT/CN2023/125231
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English (en)
Chinese (zh)
Inventor
姚俊
吴雅静
盖蕊
郭谨博
Original Assignee
广东美芝制冷设备有限公司
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Publication of WO2024099043A1 publication Critical patent/WO2024099043A1/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
    • H02K1/02—Details of the magnetic circuit characterised by the magnetic material
    • 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]

Definitions

  • the present application belongs to the field of motor technology, and specifically relates to a rotor structure, a permanent magnet motor and applications.
  • variable-frequency motors generally use permanent magnet motors.
  • permanent magnet motors the excitation method of the rotor is by permanent magnet excitation. Due to the high power density characteristics of permanent magnet motors and the need to reduce costs, the anti-demagnetization ability of the rotor permanent magnets is weakened. When the permanent magnets are irreversibly demagnetized, it will affect the operating performance and reliability of the motor and compressor, and seriously affect the service life of the product. In addition, with the increase in the price of rare earth materials, the price of rare earth permanent magnet materials and the cost of motors have risen sharply.
  • the present application aims to at least partially solve one of the above technical problems existing in the prior art. To this end, the present application provides a rotor structure.
  • the present application also provides a permanent magnet motor, which includes the rotor structure.
  • the present application also provides a compressor, which includes the rotor structure.
  • the present application also provides a refrigeration device, which includes the permanent magnet motor or the compressor.
  • a rotor structure comprising a rotor core and a plurality of permanent magnets, wherein:
  • a plurality of slots are provided on the end surface of the rotor core along the circumferential direction;
  • Each of the permanent magnets is correspondingly embedded in each of the slots.
  • the permanent magnets contain heavy rare earth elements, and the permanent magnets are divided into a diffusion zone and a non-diffusion zone according to the content of the heavy rare earth elements.
  • the diffusion zone contains heavy rare earth elements with a mass percentage of g%.
  • the non-diffusion zone contains heavy rare earth elements with a mass percentage of g ⁇ %.
  • a first magnetic isolation bridge is arranged between the permanent magnets, and y1 is the thickness of the first magnetic isolation bridge.
  • L max is the maximum length of the diffusion zone along the width direction of the permanent magnet.
  • W max is the maximum length of the diffusion zone along the thickness direction of the permanent magnet.
  • D is the outer diameter of the rotor core.
  • T is the thickness of the rotor core.
  • P is the number of pole pairs of the permanent magnet.
  • the units of y 1 , L max , W max , D and T are all millimeters. Among them:
  • the thickness of the magnetic isolation bridge may range from 0.4 mm to 0.9 mm.
  • the maximum length L max of the diffusion region along the width direction of the permanent magnet may be in the range of 1 mm to 15 mm.
  • the maximum length W max of the diffusion region along the thickness direction of the permanent magnet may be in the range of 1 mm to 3.5 mm.
  • the outer diameter D of the rotor core may be in the range of 60 mm to 90 mm.
  • the thickness T of the rotor core may be in the range of 50 mm to 120 mm.
  • the number of permanent magnet pole pairs P may range from 2 to 5.
  • the shape of the permanent magnet includes a rectangular parallelepiped.
  • the permanent magnet is divided into length direction, width direction and thickness direction.
  • the diffusion zone is distributed along the width direction of the permanent magnet to form a plurality of diffusion zones.
  • the diffusion zone may be distributed along the width direction of the permanent magnet to form a diffusion zone.
  • the diffusion zone may be distributed along the width direction of the permanent magnet to form two diffusion zones.
  • the diffusion region may be distributed along the width direction of the permanent magnet to form a plurality of diffusion regions.
  • the distribution shape of the diffusion zone includes a U-shaped structure.
  • the distribution shape of the diffusion zone includes a quadrangular structure.
  • the distribution shape of the diffusion zone includes three stripe structures.
  • the diffusion region includes a first diffusion region and/or a second diffusion region.
  • the first diffusion region contains heavy rare earth elements at a mass percentage of g 1 %
  • the second diffusion region contains heavy rare earth elements at a mass percentage of g 2 %.
  • the mass percentage of the heavy rare earth element in the first diffusion region is g 1 %, and g 1 % is 1.0% to 2.0%.
  • the mass percentage of the heavy rare earth element in the first diffusion region is g 1 %, and g 1 % is 1.05% to 2.00%.
  • the mass percentage of the heavy rare earth element in the second diffusion region is g 2 %, and g 2 % is 0.5% to 1.4%.
  • the mass percentage of the heavy rare earth element in the second diffusion region is g 2 %, and g 2 % is 0.59% to 1.25%.
  • the mass percentage of the heavy rare earth element in the non-diffusion region is 0-0.6%.
  • the mass percentage of the heavy rare earth element in the non-diffusion region is 0-0.55%.
  • the mass percentage of the heavy rare earth element in the non-diffusion region is 0-0.53%.
  • the slot is V-shaped.
  • the V-shaped opening faces the motor stator.
  • a second magnetic isolation bridge is further provided between each of the permanent magnets.
  • the second magnetic isolation bridge is disposed at the bottom of the V-shape.
  • y2 is the thickness of the second magnetic isolation bridge.
  • L 1max is the maximum length of the first diffusion region along the width direction of the permanent magnet.
  • W 1max is the maximum length of the first diffusion region along the thickness direction of the permanent magnet.
  • L 2max is the maximum length of the second diffusion region along the width direction of the permanent magnet.
  • W 2max is the maximum length of the second diffusion region along the thickness direction of the permanent magnet.
  • the diffusion region includes a first diffusion region and a second diffusion region
  • y 1 , y 2 , L 1max , L 2max , W 1max , W 2max , D, T and P simultaneously satisfy the formula: (1) to (4).
  • L 1max , L 2max , W 1max , W 2max are coating positions defined in this application.
  • the units of y 1 , y 2 , L 1max , L 2max , W 1max , W 2max , D and T are all millimeters.
  • the thickness of the second magnetic isolation bridge is y 2 .
  • the maximum length of the first diffusion region along the width direction of the permanent magnet is L 1max .
  • the maximum length of the first diffusion region along the thickness direction of the permanent magnet is W 1max .
  • the maximum length of the second diffusion region along the width direction of the permanent magnet is L 2max .
  • the maximum length of the second diffusion region along the thickness direction of the permanent magnet is W 2max .
  • y 1 , y 2 , L 1max , L 2max , W 1max , W 2max , D, T and P satisfy equations (1) and (3), or the relationship satisfies equations (2) and (4).
  • the slot is in a straight line shape.
  • a maximum length of the first diffusion region along a width direction of the permanent magnet is L 1max .
  • the maximum length of the first diffusion region along the thickness direction of the permanent magnet is W 1max .
  • the maximum length of the second diffusion region along the width direction of the permanent magnet is L 2max .
  • the maximum length of the second diffusion region along the thickness direction of the permanent magnet is W 2max .
  • the diffusion region includes the first diffusion region and the second diffusion region
  • y 1 , L 1max , L 2max , W 1max , W 2max , D, T and P simultaneously satisfy the relations of equations (5) to (8).
  • a maximum length of the first diffusion region along a width direction of the permanent magnet is L 1max .
  • the maximum length of the first diffusion region along the thickness direction of the permanent magnet is W 1max .
  • the maximum length of the second diffusion region along the width direction of the permanent magnet is L 2max .
  • the maximum length of the second diffusion region along the thickness direction of the permanent magnet is W 2max .
  • a cross-sectional area of the first diffusion region perpendicular to the axis of the rotor core is S 1 .
  • a cross-sectional area of the second diffusion region perpendicular to the axis of the rotor core is S 2 .
  • the diffusion region areas of the permanent magnet in cross sections with different widths and thicknesses may be the same.
  • the diffusion zone areas of the permanent magnet in cross sections with different widths and thicknesses may also be different.
  • the heavy rare earth element can be evenly distributed in the diffusion zone.
  • the heavy rare earth element may also be distributed non-uniformly in the diffusion zone.
  • the permanent magnet includes a radially magnetized permanent magnet.
  • the permanent magnet also includes a parallel magnetized permanent magnet.
  • the heavy rare earth element includes dysprosium, terbium or a combination thereof.
  • the permanent magnet pole pair number P 2.
  • the rotor core is formed by stacking a plurality of silicon steel sheets.
  • the permanent magnet motor provided according to the second aspect of the present application includes the above-mentioned rotor structure.
  • the main components of a permanent magnet motor include a stator structure and a rotor structure, wherein the stator structure and the rotor structure are coaxially arranged, and the rotor structure can rotate relative to the stator structure.
  • the stator core when winding the stator teeth to set the stator winding in the winding slot, it can play a normal magnetic field driving role on the rotor structure, thereby realizing the rotation of the rotor structure.
  • the rotor structure is coaxially arranged with the stator structure, mainly including two parts: the rotor core and the permanent magnet.
  • the stator structure When the stator structure is energized to generate a vector magnetic field, the magnetic part will rotate under the magnetic action, thereby realizing the movement of the rotor structure.
  • the axis of the stator core is colinear with the axis of the rotor core, and the stator teeth and permanent magnets are arranged around the axis, and are generally evenly arranged.
  • the compressor provided according to the third aspect of the present application includes the rotor structure described above.
  • the refrigeration equipment provided according to the fourth aspect of the present application includes the permanent magnet motor or the compressor.
  • the refrigeration equipment includes an air conditioner.
  • the air conditioner is a household air conditioner.
  • FIG. 1 is a schematic diagram of a rotor structure when the slot is V-shaped.
  • FIG. 2 is a second schematic diagram of the rotor structure when the slot is V-shaped.
  • FIG. 3 is a schematic diagram of a permanent magnet in width and thickness directions.
  • FIG. 4 is a schematic diagram of a permanent magnet having only one diffusion region.
  • FIG. 5 is a schematic diagram of a permanent magnet having a U-shaped diffusion region.
  • FIG. 6 is a schematic diagram of a permanent magnet having a quadrilateral diffusion region.
  • FIG. 7 is a schematic diagram of a permanent magnet having a three-strip structure in the diffusion region.
  • FIG. 8 is a schematic diagram showing the case where the diffusion regions are distributed at both ends of the permanent magnet in the width direction.
  • FIG. 9 is one of the schematic diagrams of the rotor structure when the slots are in a straight line shape.
  • FIG. 10 is a second schematic diagram of the rotor structure when the slots are in a straight line shape.
  • FIG. 11 is a partially enlarged schematic diagram of the diffusion region when the slot is V-shaped.
  • FIG. 12 is a partial enlarged schematic diagram of the area of the diffusion zone when the slot is in a straight line shape.
  • FIG. 13 is a schematic diagram of the structure of a permanent magnet motor when the slot is V-shaped.
  • FIG. 14 is a schematic diagram of the structure of a permanent magnet motor when the slot is in a straight line.
  • the present application provides a rotor structure, including a rotor core 100 and a plurality of permanent magnets 120. Specifically:
  • the rotor core 100 has a plurality of slots 110 formed along the circumferential direction on its end surface, and each permanent magnet 120 is correspondingly embedded in each slot 110.
  • the permanent magnet 120 contains some heavy rare earth elements, and the permanent magnet 120 can be divided into a diffusion zone 130 and a non-diffusion zone according to the content of the heavy rare earth elements.
  • the diffusion region 130 contains heavy rare earth elements at a mass percentage of g%, and the non-diffusion region contains heavy rare earth elements at a mass percentage of g ⁇ %, where g ⁇ g.
  • a first magnetic isolation bridge 140 is disposed between the permanent magnets 120 .
  • the thickness of the first magnetic isolation bridge 140 is y 1
  • the maximum length of the diffusion zone 130 along the width direction of the permanent magnet 120 is L max
  • the maximum length of the diffusion zone 130 along the thickness direction of the permanent magnet 120 is W max
  • the outer diameter of the rotor core 100 is D
  • the thickness of the rotor core 100 is T
  • the number of pole pairs of the permanent magnet 120 is P.
  • the rotor structure of the present application includes a rotor core and a plurality of permanent magnets.
  • a plurality of slots are provided on the end face of the rotor core along the circumferential direction, and each permanent magnet is correspondingly embedded in each slot.
  • the permanent magnet contains heavy rare earth elements. According to the content of heavy rare earth elements, the permanent magnet can be divided into a diffusion zone and a non-diffusion zone.
  • the diffusion zone contains heavy rare earth elements with a mass percentage of g%.
  • the non-diffusion zone contains heavy rare earth elements with a mass percentage of g ⁇ %.
  • the relationship between g ⁇ and g is: g ⁇ g.
  • a first magnetic isolation bridge is arranged between the permanent magnets, and the thickness is y 1.
  • the maximum length of the diffusion zone along the width direction of the permanent magnet is L max .
  • the maximum length of the diffusion zone along the thickness direction of the permanent magnet is W max .
  • the outer diameter of the rotor core is D.
  • the thickness of the rotor core is T.
  • the number of permanent magnet pole pairs is P.
  • the rotor structure of the present application combines the key parameters y 1 , L max , W max , D, T and P with the coating position of the heavy rare earth coating to form a formula. If the overall anti-demagnetization ability of the motor structure design is poor, in order to ensure reliability, the coating position (length, width, area) is required to be larger; on the contrary, if the overall anti-demagnetization ability of the motor structure design is good, the coating position (length, width, area) can be designed to be relatively small.
  • the magnetic isolation bridge can play a magnetic isolation role to a certain extent.
  • the possibility of magnetic circuit disorder and magnetic leakage problems inside the rotor structure can be effectively reduced.
  • the smaller the width of the magnetic isolation bridge the greater the reverse magnetic field on both sides of the permanent magnet (under the same conditions, it is easier to demagnetize).
  • the magnetic isolation bridge mainly affects the size of the motor's magnetic leakage coefficient. The larger the magnetic leakage coefficient, the weaker the permanent magnet is affected by the reverse magnetic field, and the better the demagnetization resistance.
  • the thickness of the magnetic isolation bridge refers to the distance between the edge of the permanent magnet placement slot close to the outer diameter of the rotor core and the side of the outer diameter of the rotor core. Referencing Figures 2, 10, 11 and 12 may help to understand this.
  • the diffusion zone refers to a layer of heavy rare earth coating applied on the surface of the permanent magnet substrate during the manufacturing process of the permanent magnet.
  • different formulas can be formulated according to different needs. The higher the anti-demagnetization requirements, the higher the content of heavy rare earth elements in the formula. If two concentrations of heavy rare earth formula liquid are coated on the permanent magnet substrate respectively, diffusion zones with different anti-demagnetization properties will be formed. After the heavy rare earth coating is applied, high-temperature treatment is required to allow the heavy rare earth elements to diffuse into the permanent magnet and form a stable grain boundary state.
  • NdFeB permanent magnets are permanent magnet materials based on the intermetallic compound Nd 2 Fe 14 B, and their main components are neodymium, iron and boron.
  • heavy rare earth metals such as dysprosium and terbium can be used to replace part of the neodymium in the permanent magnet.
  • Heavy rare earth metals refer to those with atomic numbers ranging from 64 to 71, plus element 39, namely gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium.
  • the thickness of the magnetic isolation bridge may range from 0.4 mm to 0.9 mm.
  • the maximum length L max of the diffusion region along the width direction of the permanent magnet may be in the range of 1 mm to 15 mm.
  • the maximum length W max of the diffusion region along the thickness direction of the permanent magnet may be in the range of 1 mm to 3.5 mm.
  • the outer diameter D of the rotor core may be in the range of 60 mm to 90 mm.
  • the thickness T of the rotor core may be in the range of 50 mm to 120 mm.
  • the number of permanent magnet pole pairs P may range from 2 to 5.
  • the shape of the permanent magnet includes a rectangular parallelepiped, which is divided into a length direction, a width direction, and a thickness direction for the convenience of description and understanding.
  • the diffusion regions are distributed along the width direction of the permanent magnet to form a plurality of diffusion regions.
  • the diffusion regions are distributed along the width direction of the permanent magnet to form a plurality of diffusion regions, and the distribution shapes of these diffusion regions include a U-shaped structure, a quadrangular structure and a three-strip structure.
  • the diffusion regions may be distributed along the width direction of the permanent magnet to form one, two or more diffusion regions.
  • the diffusion zone can be distributed along the width direction of the permanent magnet, and there is only one diffusion zone, as shown in Figure 4.
  • the advantage of having only one diffusion zone is that the amount of heavy rare earth elements used is small and the cost is low.
  • the disadvantage is that the rotor production is complicated and the direction needs to be confirmed.
  • the diffusion zone needs to be close to the winding side of the stator, which is the area most susceptible to demagnetization.
  • the situation with only one diffusion zone is suitable for situations with a high degree of automation and does not require manual identification and positioning.
  • the diffusion zone is distributed along the width direction of the permanent magnet, and the first diffusion zone 1310, the second diffusion zone 1320 and the third diffusion zone 1330 can form a U-shaped structure, as shown in FIG5.
  • the advantage of the U-shaped structure is that it can cover all the easily demagnetized areas of the permanent magnet, and has excellent anti-demagnetization performance.
  • the disadvantage is that the amount of heavy rare earth elements used is large and the cost is high.
  • the U-shaped structure is suitable for situations where high anti-demagnetization performance is required.
  • the diffusion regions are distributed along the width direction of the permanent magnet, and the first diffusion region 1310 and the second diffusion region 1320 can also form a quadrangular structure, as shown in FIG6 .
  • the advantage of the quadrangular structure is that the amount of heavy rare earth elements is small and the cost is low.
  • the disadvantage is that there are some
  • the quadrilateral structure is suitable for the case where the permanent magnet height is small, that is, the rotor thickness is small.
  • the diffusion regions are distributed along the width direction of the permanent magnet, and the first diffusion region 1310, the second diffusion region 1320 and the third diffusion region 1330 can also form a three-strip structure, as shown in FIG7.
  • the advantage of the three-strip structure is that different diffusion regions can correspond to different anti-demagnetization properties, and the design is targeted.
  • the disadvantage is that the manufacturing process of the permanent magnet is complicated.
  • the three-strip structure is suitable for special rotor structures and can improve the anti-demagnetization ability in a targeted manner.
  • the diffusion region includes a first diffusion region 1310 and a second diffusion region 1320 .
  • the first diffusion region 1310 contains g 1 % of heavy rare earth elements
  • the second diffusion region 1320 contains g 2 % of heavy rare earth elements.
  • the mass percentage of the heavy rare earth element in the non-diffusion region is 0-0.6%.
  • the mass percentage of the heavy rare earth element in the non-diffusion region is 0-0.55%.
  • the mass percentage of the heavy rare earth element in the non-diffusion region is 0-0.53%.
  • the mass percentage g 1 % of the heavy rare earth element in the first diffusion region 1310 is 1.0%-2.0%.
  • the mass percentage g 1 % of the heavy rare earth element in the first diffusion region 1310 is 1.05%-2.00%.
  • the mass percentage g 2 % of the heavy rare earth element in the second diffusion region 1320 is 0.5%-1.4%.
  • the mass percentage g 2 % of the heavy rare earth element in the second diffusion region 1320 is 0.59%-1.25%.
  • the slot is V-shaped.
  • the V-shaped opening faces the motor stator.
  • rare earth magnets containing heavy rare earth elements since the intrinsic coercivity of rare earth magnets containing heavy rare earth elements is lower than that of conventional rare earth magnets, directly using rare earth magnets containing heavy rare earth elements will reduce the demagnetization ability of the motor, while the slot is V-shaped, which can enhance the anti-demagnetization ability of the motor.
  • the slot is V-shaped, and it can also achieve a magnetic field concentration effect, thereby increasing the main magnetic flux, and then increasing the back electromotive force, so as to achieve the purpose of improving the operating efficiency of the motor.
  • H cj The strength of the reverse magnetic field applied to reduce the sum of the microscopic magnetic dipole moment vector inside the magnet to zero is called the intrinsic coercive force (H cj ).
  • the intrinsic coercive force is different from the coercive force (H cb ).
  • H H cb
  • the residual magnetization intensity ( Br ) of the magnet itself is not zero, but the effect of the applied reverse magnetic field and Br cancel each other out.
  • the magnitude of the intrinsic coercive force is closely related to the temperature stability of rare earth permanent magnets. The higher the intrinsic coercive force, the better the temperature stability.
  • a second magnetic isolation bridge 150 is further provided between each permanent magnet, and the second magnetic isolation bridge 150 is provided at the bottom of the V-shape.
  • y2 is the thickness of the second magnetic isolation bridge 150
  • L1max is the maximum length of the first diffusion zone 1310 along the width direction of the permanent magnet
  • W1max is the maximum length of the first diffusion zone 1310 along the thickness direction of the permanent magnet
  • L2max is the maximum length of the second diffusion zone 1320 along the width direction of the permanent magnet
  • W2max is the maximum length of the second diffusion zone 1320 along the thickness direction of the permanent magnet.
  • L 1max , L 2max , W 1max , W 2max are coating positions defined in this application.
  • This embodiment provides a rotor structure, in which the relevant parameters are as follows:
  • the permanent magnet has a length of 89 mm, a width of 18 mm, a thickness of 2.5 mm, and a brand of 52SH.
  • the diffusion regions are distributed at both ends of the permanent magnet in the width direction, as shown in FIG8 .
  • the diffusion zone has a length of 89 mm, a width of 4 mm and a thickness of 2.5 mm.
  • the intrinsic coercive force of the non-diffusion region of the permanent magnet is 1920KA/m.
  • the intrinsic coercive force of the permanent magnet diffusion zone is ⁇ 2070KA/m.
  • the demagnetization rate of the permanent magnet at 130°C/35A is 3.89%.
  • the demagnetization rate of the permanent magnet at 130°C/43A is 6.73%.
  • the demagnetization rate is 6.5% at 130°C/35A and 8.63% at 130°C/43A.
  • the thickness of the second magnetic isolation bridge 150 is y 2
  • the maximum length of the first diffusion region 1310 along the width direction of the permanent magnet is L 1max
  • the maximum length of the first diffusion region 1310 along the thickness direction of the permanent magnet is W 1max
  • the maximum length of the second diffusion region 1320 along the width direction of the permanent magnet is L 2max
  • the maximum length of the second diffusion region 1320 along the thickness direction of the permanent magnet is W 2max .
  • the slot is in a straight line shape.
  • the maximum length of the first diffusion region 1310 along the width direction of the permanent magnet 120 is L 1max
  • the maximum length of the first diffusion region 1310 along the thickness direction of the permanent magnet 120 is W 1max
  • the maximum length of the second diffusion region 1320 along the width direction of the permanent magnet 120 is L 2max
  • the maximum length of the second diffusion region 1320 along the thickness direction of the permanent magnet 120 is W 2max .
  • 0.02 ⁇ k 1 ⁇ 1.60
  • 0.02 ⁇ k 2 ⁇ 1.60
  • 0.02 ⁇ k 3 ⁇ 1.37
  • 0.02 ⁇ k 4 ⁇ 1.37.
  • the maximum length of the first diffusion region 1310 along the width direction of the permanent magnet 120 is L 1max
  • the maximum length of the first diffusion region 1310 along the thickness direction of the permanent magnet 120 is W 1max
  • the maximum length of the second diffusion region 1320 along the width direction of the permanent magnet 120 is L 2max
  • the maximum length of the second diffusion region 1320 along the thickness direction of the permanent magnet 120 is W 2max .
  • the cross-sectional area of the first diffusion region perpendicular to the axis of the rotor core is S 1
  • the cross-sectional area of the second diffusion region perpendicular to the axis of the rotor core is S 2 .
  • This embodiment provides a rotor structure, in which the relevant parameters are as follows:
  • the permanent magnet has a length of 89 mm, a width of 18 mm, a thickness of 2.5 mm, and a brand of 52SH.
  • the diffusion regions are distributed at both ends of the permanent magnet in the width direction, as shown in FIG8 .
  • the diffusion zone is 89 mm long, 4 mm wide and 2.5 mm thick.
  • the intrinsic coercive force of the non-diffusion region of the permanent magnet is 1920KA/m.
  • the intrinsic coercive force of the permanent magnet diffusion zone is ⁇ 2070KA/m.
  • the demagnetization rate of the permanent magnet at 130°C/35A is 4.1%.
  • the demagnetization rate of the permanent magnet at 130°C/43A is 6.94%.
  • the demagnetization rate is 6.5% at 130°C/35A and 8.63% at 130°C/43A.
  • the demagnetization rate test method is mainly:
  • the rotor after the initial magnetic flux test is placed in a constant temperature box for more than 4 hours, and the temperature of the constant temperature box is set to the specified temperature (130°C);
  • test DC motor connects to the DC power supply and set the demagnetization current according to the pre-set demagnetization current value (43A, 50A, etc.);
  • the rotor was placed at room temperature for more than 4 hours, and then the rotor temperature and magnetic flux ⁇ 1 after demagnetization were measured.
  • the demagnetization rate is calculated using the following formula ( ⁇ i needs to be converted to the same temperature as ⁇ 0 ):
  • Demagnetization rate ( ⁇ i - ⁇ 0 )/ ⁇ 0 ⁇ 100%.
  • ⁇ i The magnetic flux of the rotor after the demagnetization test at the i-th demagnetization current value.
  • the cross-sectional area of the first diffusion region perpendicular to the axis of the rotor core is S 1
  • the cross-sectional area of the second diffusion region perpendicular to the axis of the rotor core is S 2 .
  • the diffusion regions of the permanent magnet in cross sections with different widths and thicknesses have the same area.
  • the diffusion area of the permanent magnet in cross sections with different widths and thicknesses is different.
  • the heavy rare earth elements are uniformly distributed in the diffusion zone.
  • the heavy rare earth elements are non-uniformly distributed in the diffusion region.
  • the permanent magnet includes a radially magnetized permanent magnet.
  • the permanent magnet includes a parallel-magnetized permanent magnet.
  • radial magnetization is magnetization in the diameter direction. If the two magnets are adsorbed on the side, it is radial magnetization.
  • the heavy rare earth element includes dysprosium, terbium or a combination thereof.
  • Dysprosium is a silvery-white metal with the symbol Dy. It is soft and can be cut with a knife. The melting point of dysprosium is 1412°C, the boiling point is 2562°C, and the density is 8.55g/ cm3 . It has superconductivity when it is close to absolute zero. Dysprosium is quite stable in the air and is easily oxidized by air and water at high temperatures to form dysprosium oxide. Dysprosium is mainly used to manufacture new lighting sources such as dysprosium lamps; dysprosium can be used as a control material for reactors; dysprosium compounds can be used as catalysts in the oil refining industry.
  • Terbium is a member of the lanthanide series, with an atomic number of 65 and an element symbol of Tb. Its single substance is a silvery-white metal.
  • the number of permanent magnet pole pairs P is ⁇ 2.
  • the rotor core is formed by stacking a plurality of silicon steel sheets.
  • the present application also provides a permanent magnet motor, including a rotor structure.
  • the main components of the permanent magnet motor include a stator structure and a rotor structure, wherein the stator structure and the rotor structure are coaxially arranged, and the rotor structure can rotate relative to the stator structure.
  • the stator core when winding the stator teeth to set the stator winding in the winding slot, it can play a normal magnetic field driving role on the rotor structure, thereby realizing the rotation of the rotor structure.
  • the rotor structure is coaxially arranged with the stator structure, mainly including two parts: the rotor core and the permanent magnet.
  • the stator structure When the stator structure is energized to generate a vector magnetic field, the magnetic part will rotate under the magnetic action, thereby realizing the movement of the rotor structure.
  • the axis of the stator core is colinear with the axis of the rotor core, and the stator teeth and permanent magnets are arranged around the axis, and are generally evenly arranged.
  • the permanent magnet motor of the present application includes the rotor structure of the present application, and thus the permanent magnet motor of the present application has all the effects of the rotor structure.
  • the rotor structure includes a rotor core and a plurality of permanent magnets.
  • a plurality of slots are arranged on the end surface of the rotor core in the circumferential direction, and each permanent magnet is correspondingly embedded in each slot.
  • Permanent magnets contain heavy rare earth elements. Permanent magnets can be divided into diffusion zones and non-diffusion zones according to the content of heavy rare earth elements.
  • the diffusion zone contains heavy rare earth elements with a mass percentage of g%, and the non-diffusion zone contains heavy rare earth elements with a mass percentage of g ⁇ %.
  • a first magnetic isolation bridge is arranged between the permanent magnets; the thickness of the first magnetic isolation bridge is y 1 .
  • the maximum length of the diffusion zone along the width direction of the permanent magnet is L max .
  • the maximum length of the diffusion zone along the thickness direction of the permanent magnet is W max .
  • the outer diameter of the rotor core is D.
  • the thickness of the rotor core is T.
  • the number of permanent magnet pole pairs is P.
  • the local anti-demagnetization ability of the permanent magnet can be improved under the premise of ensuring the demagnetization reliability and not increasing the volume of the permanent magnet, thereby improving the anti-demagnetization ability of the rotor and reducing Low rotor cost, motor performance can meet the application requirements of the whole machine.
  • the present application further provides a compressor, including a rotor structure.
  • the compressor includes a rotor structure and a stator 200 wound outside the rotor structure.
  • the compressor of the present application includes the rotor structure of the present application, and thus, the compressor of the present application also has all the effects of the rotor structure.
  • the rotor structure includes a rotor core and a plurality of permanent magnets.
  • a plurality of slots are arranged on the end surface of the rotor core along the circumferential direction, and each permanent magnet is correspondingly embedded in each slot.
  • Permanent magnets contain some heavy rare earth elements. Permanent magnets can be divided into diffusion zone and non-diffusion zone according to the content of heavy rare earth elements.
  • the diffusion zone contains heavy rare earth elements with a mass percentage of g%.
  • the non-diffusion zone contains heavy rare earth elements with a mass percentage of g ⁇ %.
  • a first magnetic isolation bridge is arranged between the permanent magnets, and has a thickness of y 1 .
  • the maximum length of the diffusion zone along the width direction of the permanent magnet is L max .
  • the maximum length of the diffusion zone along the thickness direction of the permanent magnet is W max .
  • the outer diameter of the rotor core is D.
  • the thickness of the rotor core is T.
  • the number of permanent magnet pole pairs is P.
  • the local anti-demagnetization ability of the permanent magnet can be improved while ensuring the demagnetization reliability and not increasing the volume of the permanent magnet, thereby improving the anti-demagnetization ability of the rotor, reducing the rotor cost, and the motor performance can meet the application requirements of the whole machine. Finally, the performance of the compressor is improved.
  • the present application also provides a refrigeration device, including a permanent magnet motor or a compressor.
  • the refrigeration device of the present application includes the rotor structure of the present application, and thus the compressor of the present application also has all the effects of the rotor structure.
  • the rotor structure includes a rotor core and a plurality of permanent magnets.
  • a plurality of slots are arranged on the end surface of the rotor core along the circumferential direction, and each permanent magnet is correspondingly embedded in each slot.
  • Permanent magnets contain some heavy rare earth elements. Permanent magnets can be divided into diffusion zone and non-diffusion zone according to the content of heavy rare earth elements.
  • the diffusion zone contains heavy rare earth elements with a mass percentage of g%.
  • the non-diffusion zone contains heavy rare earth elements with a mass percentage of g ⁇ %.
  • a first magnetic isolation bridge is arranged between the permanent magnets, and has a thickness of y 1 .
  • the maximum length of the diffusion zone along the width direction of the permanent magnet is L max .
  • the maximum length of the diffusion zone along the thickness direction of the permanent magnet is W max .
  • the outer diameter of the rotor core is D.
  • the thickness of the rotor core is T.
  • the number of permanent magnet pole pairs is P.
  • the refrigeration equipment includes but is not limited to refrigerators, freezers, air conditioners and other equipment with refrigeration functions.
  • the compressor is one of the core components of the air conditioner, which plays the role of compressing and driving the refrigerant in the air conditioner refrigerant circuit.
  • the compressor of the air conditioner is generally installed in the outdoor unit.
  • the compressor of the air conditioner extracts the refrigerant from the low-pressure area, compresses it, and sends it to the high-pressure area for cooling and condensation.
  • the heat is dissipated into the air through the heat sink, and the refrigerant also changes from gas to liquid, and the pressure increases.
  • the working circuit of the compressor is divided into the evaporation area (low pressure area) and the condensation area (high pressure area).
  • the indoor and outdoor units of the air conditioner are low pressure and high pressure. Or high pressure area (depending on the working state).
  • the refrigerant then flows from the high pressure area to the low pressure area, and is sprayed into the evaporator through the capillary tube.
  • the pressure drops suddenly, and the liquid refrigerant immediately turns into gas, absorbing a large amount of heat from the air through the heat sink.
  • the air conditioner compressor keeps working, constantly absorbing the heat at one end of the low pressure area into the refrigerant, and then sending it to the high pressure area to dissipate into the air, which plays a role in regulating the temperature.
  • the air conditioner is a household air conditioner.
  • first and second are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as “first” or “second” may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of “plurality” is two or more, unless otherwise clearly and specifically defined.
  • the terms “installed”, “connected”, “connected”, “fixed” and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements.
  • installed can be a fixed connection, a detachable connection, or an integral connection
  • it can be a mechanical connection, an electrical connection, or a communication
  • it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements.

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

Abstract

Une structure de rotor, un moteur électrique à aimants permanents et une utilisation. La structure de rotor comprend un noyau de rotor (100) et une pluralité d'aimants permanents (120). Une pluralité de fentes (110) sont disposées dans une surface d'extrémité du noyau de rotor (100) dans une direction circonférentielle. Chaque aimant permanent (120) est intégré de manière correspondante dans chaque fente (110), les aimants permanents (120) contiennent des éléments de terres rares lourds, et chaque aimant permanent (120) est divisé en une région de diffusion (130) et une région de non-diffusion en fonction de la teneur des éléments de terres rares lourds, la région de diffusion (130) contenant, en pourcentage en masse, g % d'éléments de terres rares lourds, et la région de non-diffusion contient, en pourcentage en masse, g' % d'éléments de terres rares lourds, g' < g. Un premier pont d'isolation magnétique (140) étant disposé entre les aimants permanents (120).
PCT/CN2023/125231 2022-11-10 2023-10-18 Structure de rotor, moteur électrique à aimants permanents et utilisation WO2024099043A1 (fr)

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CN202211403101.4 2022-11-10
CN202211403101.4A CN118017731A (zh) 2022-11-10 2022-11-10 一种转子结构、永磁电机和应用

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Citations (6)

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Publication number Priority date Publication date Assignee Title
JP2014171387A (ja) * 2014-05-19 2014-09-18 Shin Etsu Chem Co Ltd 永久磁石式回転機用回転子
CN111555479A (zh) * 2020-05-26 2020-08-18 安徽美芝精密制造有限公司 电机、压缩机和制冷设备
CN112886738A (zh) * 2021-01-11 2021-06-01 珠海格力节能环保制冷技术研究中心有限公司 转子组件、切向式电机、压缩机、空调器
CN114513070A (zh) * 2022-01-19 2022-05-17 浙江零跑科技股份有限公司 一种新型电机转子
CN114709952A (zh) * 2022-04-28 2022-07-05 安徽美芝精密制造有限公司 转子组件、永磁电机和压缩机
CN114759703A (zh) * 2022-04-28 2022-07-15 安徽美芝精密制造有限公司 转子组件、永磁电机和压缩机

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014171387A (ja) * 2014-05-19 2014-09-18 Shin Etsu Chem Co Ltd 永久磁石式回転機用回転子
CN111555479A (zh) * 2020-05-26 2020-08-18 安徽美芝精密制造有限公司 电机、压缩机和制冷设备
CN112886738A (zh) * 2021-01-11 2021-06-01 珠海格力节能环保制冷技术研究中心有限公司 转子组件、切向式电机、压缩机、空调器
CN114513070A (zh) * 2022-01-19 2022-05-17 浙江零跑科技股份有限公司 一种新型电机转子
CN114709952A (zh) * 2022-04-28 2022-07-05 安徽美芝精密制造有限公司 转子组件、永磁电机和压缩机
CN114759703A (zh) * 2022-04-28 2022-07-15 安徽美芝精密制造有限公司 转子组件、永磁电机和压缩机

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