A rotor punching sheet, a rotor, a motor and a compressor having the same

Abstract

The present invention provides a rotor punching sheet, a rotor, a motor and a compressor having the same. The rotor punching sheet has a radial magnet groove extending along the radial direction of the rotor punching sheet and a tangential magnet groove extending along the tangential direction of the rotor punching sheet. Magnets are arranged in the radial magnet groove and the tangential magnet groove. Two adjacent radial magnets and tangential magnets form a magnetic pole, which increases the magnetic concentration effect and improves the utilization rate of the magnets. The thickness of the radial magnet is greater than the thickness of the tangential magnet, which improves the demagnetization resistance of the radial magnet. First magnetic isolation grooves are arranged on both sides of each radial magnet groove, which can reduce the reverse magnetic field magnetization intensity of the motor rotor. Second magnetic isolation grooves are arranged outside each tangential magnet, which can improve the torque noise index of the motor. A plurality of flow grooves are arranged along the circumferential direction of the rotor punching sheet for cooling the magnets, reducing the exhaust resistance and axial movement. When the above rotor punching sheet is applied to a motor, the outer diameter of the rotor is larger, the moment of inertia is increased, the vibration noise and operating current of the motor can be reduced, and the motor efficiency can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and in particular, relates to a rotor punching sheet, a rotor, a motor and a compressor having the same. Background Art

[0002] Environmental protection and energy conservation are important concerns for the sustainable development of society. With the improvement of living quality, the popularity of refrigeration and air-conditioning has increased. According to statistics, the power consumption of refrigeration and air-conditioning nationwide accounts for 20% of the annual power consumption. As an important component of refrigeration and air-conditioning, the compressor has the largest energy consumption ratio. How to reduce the loss and improve the efficiency of the motor in the compressor while reducing the usage amount of rare earth permanent magnets has become a key issue. In the prior art, the hybrid magnetic circuit rotor structure can effectively increase the magnetic flux per pole of the rotor, reduce the operating current, improve the motor efficiency, and reduce the energy consumption. At the same time, by arranging the magnetic steel radially, the N pole or S pole magnetic flux of adjacent two poles can be provided, and the utilization rate of the permanent magnet is improved. Summary of the Invention

[0003] In view of this, the present invention provides a rotor punching sheet, a rotor, a motor and a compressor having the same, so as to solve the problems of large low-frequency torque fluctuation and high vibration and noise of the motor in the prior art, obtain a better magnetic focusing effect, and improve the utilization rate of the permanent magnet.

[0004] The rotor punching sheet provided by the present invention has a plurality of radial magnetic steel grooves and a plurality of tangential magnetic steel grooves arranged along the circumferential direction of the rotor punching sheet; the radial magnetic steel grooves extend along the radial direction of the rotor punching sheet, and the tangential magnetic steel grooves extend along the tangential direction of the rotor punching sheet; the radial magnetic steel grooves and the tangential magnetic steel grooves are arranged alternately, and magnetic steel is provided in the radial magnetic steel grooves and the tangential magnetic steel grooves; each magnetic pole is composed of a hybrid magnetic circuit formed by two adjacent radial magnetic steels and a tangential magnetic steel arranged between the two radial magnetic steels, and the provided magnetic flux directions are the same;

[0005] The width of the radial magnetic steel is L1, and the width of the tangential magnetic steel is L2; when the rotor forms a rotor with N magnetic poles, the total width of the magnetic steel used by the rotor is L3 = N*(L1 + L2); when the rotor punching sheet is applied to a compressor, the total displacement of the compressor is Vmm 3 , 0.2 ≤ V / L3 ≤ 0.4.

[0006] Further optionally, the radial magnetic steel grooves extend from the ends of two adjacent tangential magnetic steel grooves to the edge of the rotor punching sheet; the radial magnetic steels on both sides of the tangential magnetic steel are symmetrically arranged with respect to the tangential magnetic steel.

[0007] Further optionally, the width of the radial magnetic steel is less than the width of the tangential magnetic steel, where 0.22 ≤ L1 / L2 ≤ 0.39.

[0008] Further optionally, the thickness of the radial permanent magnet is H1, the thickness of the tangential permanent magnet is H2, the thickness of the radial permanent magnet is greater than that of the tangential permanent magnet, where 1 ≤ H1 / H2 ≤ 1.4.

[0009] Further optionally, a plurality of flow grooves are provided along the circumferential direction of the rotor punching sheet for reducing exhaust resistance and axial end play; the total area of the flow grooves is S mm 2 ; where 0.25 ≤ V / S ≤ 0.4.

[0010] Further optionally, there is a first magnetic isolation bridge between the radial permanent magnet groove and the edge of the rotor punching sheet.

[0011] Further optionally, a first magnetic isolation groove group and a second magnetic isolation groove group are formed on the rotor punching sheet; the first magnetic isolation groove group is arranged near the radial permanent magnet groove and corresponds to the number of the radial permanent magnet grooves; the second magnetic isolation groove group is arranged near the edge of the rotor punching sheet and corresponds to the number of the tangential permanent magnet grooves.

[0012] Further optionally, the first magnetic isolation groove group has an even number of first magnetic isolation grooves, and at least one first magnetic isolation groove is arranged on both sides of each radial permanent magnet groove.

[0013] Further optionally, the second magnetic isolation groove group has a plurality of second magnetic isolation grooves, and at least one second magnetic isolation groove is arranged outside each tangential permanent magnet groove and near the edge of the rotor punching sheet.

[0014] Further optionally, a third magnetic isolation groove is also formed on the rotor punching sheet; the third magnetic isolation groove is arranged between the ends of two adjacent tangential permanent magnet grooves and communicates with the radial permanent magnet groove; the number of the third magnetic isolation grooves corresponds to the number of the tangential permanent magnet grooves.

[0015] Further optionally, a second magnetic isolation bridge is formed on one side of the third magnetic isolation groove close to the end of the tangential permanent magnet groove.

[0016] Further optionally, the radial permanent magnet and the tangential permanent magnet have the same grade.

[0017] Further optionally, the rotor punching sheet is formed with 6 tangential permanent magnet grooves and 6 radial permanent magnet grooves, and thus the rotor can form 6 magnetic poles.

[0018] The present invention also provides a rotor, which has a permanent magnet and a rotor core laminated by the rotor punching sheet according to any one of the above; the permanent magnet is arranged in the radial permanent magnet groove and the tangential permanent magnet groove.

[0019] The present invention also provides a motor, which has a housing, a stator installed in the housing, and the rotor described above.

[0020] The present invention also provides a compressor having the motor described above.

[0021] Further optionally, the outer diameter of the stator is D1, and the outer diameter of the rotor is D2, where 0.2 ≤ V / D1 ≤ 0.25 and 0.35 ≤ V / D2 ≤ 0.45.

[0022] The rotor punching sheet provided by the present invention has a radial magnet groove extending along the radial direction of the rotor punching sheet and a tangential magnet groove extending along the tangential direction of the rotor punching sheet. Magnets are arranged in the radial magnet groove and the tangential magnet groove. Two adjacent radial magnets and tangential magnets form a magnetic pole, which increases the magnetic concentration effect and improves the utilization rate of the magnets; the width of the radial magnet is smaller than the width of the tangential magnet, and the thickness of the radial magnet is greater than the thickness of the tangential magnet, which improves the demagnetization resistance of the radial magnet; first magnetic isolation grooves are arranged on both sides of each radial magnet groove, which can reduce the reverse magnetic field magnetization intensity at the easily demagnetized part of the motor rotor; second magnetic isolation grooves are arranged outside each tangential magnet, which can improve the torque noise index of the motor; a plurality of flow grooves are arranged along the circumferential direction of the rotor punching sheet for cooling the magnets, reducing the exhaust resistance and axial movement; when the above rotor punching sheet is applied to the motor, the outer diameter of the rotor is larger, the moment of inertia is increased, the low-frequency torque fluctuation during the operation of the motor can be significantly reduced, the generated vibration noise can be reduced, the operating current can be reduced, and the motor efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings described below are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained according to the provided drawings.

[0024] The structures, ratios, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limited conditions for the implementation of the present invention. Therefore, they do not have technical essence. Any modification of the structure, change of the ratio relationship, or adjustment of the size should still fall within the scope that can be covered by the technical content disclosed by the present invention without affecting the effects that the present invention can produce and the purposes that can be achieved.

[0025] Figure 1a 、 Figure 1b and Figure 1c is a schematic structural diagram of an embodiment of the rotor punching sheet provided by the present invention;

[0026] Figure 2a is a schematic overall structural diagram of an embodiment of the motor provided by the present invention;

[0027] Figure 2b Explosion structure schematic diagram of the motor embodiment provided by the present invention;

[0028] In the figure:

[0029] 1 - Rotor punching; 11 - Radial magnet slot; 111 - First magnetic isolation bridge; 12 - Tangential magnet slot; 13 - First magnetic isolation slot group; 131 - First magnetic isolation slot; 14 - Second magnetic isolation slot group; 141 - Second magnetic isolation slot; 15 - Third magnetic isolation slot; 16 - Flow-through slot; 17 - Mounting hole; 18 - Shaft hole;

[0030] 21 - Radial magnet; 22 - Tangential magnet;

[0031] 3 - Motor; 31 - Housing; 32 - Stator; 321 - Stator core; 322 - Stator winding; 33 - Rotor; 331 - Rotor core; 34 - Rotor baffle. Specific embodiments

[0032] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "the" and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. "Plural" generally includes at least two, but does not exclude the case of including at least one.

[0034] It should be understood that the term "and / or" used herein is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0035] It should also be noted that the term "comprises", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion, so that a commodity or system including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such commodity or system. Without more limitations, the element defined by the statement "including one..." does not exclude the existence of another identical element in the commodity or system including the said element.

[0036] The rotor punching sheet provided by the present invention has radial magnet slots extending along the radial direction of the rotor punching sheet and tangential magnet slots extending along the tangential direction of the rotor punching sheet. Magnets are arranged in the radial magnet slots and the tangential magnet slots. Two adjacent radial magnets and tangential magnets form a magnetic pole, which increases the magnetic concentration effect and improves the utilization rate of magnets; the width of the radial magnet is smaller than the width of the tangential magnet, and the thickness of the radial magnet is greater than the thickness of the tangential magnet, which improves the demagnetization resistance of the radial magnet; first magnetic isolation slots are arranged on both sides of each radial magnet slot, which can reduce the reverse magnetic field magnetization intensity of the easily demagnetized part of the motor rotor; second magnetic isolation slots are arranged outside each tangential magnet, which can improve the torque noise index of the motor; a plurality of flow slots are arranged along the circumferential direction of the rotor punching sheet for cooling the magnets, reducing the exhaust resistance and axial movement.

[0037] Embodiment

[0038] <Rotor punching sheet>

[0039] As Figure 1a 、 Figure 1b and Figure 1c shown, the rotor punching sheet 1 provided by this embodiment has a plurality of radial magnet slots 11 and a plurality of tangential magnet slots 12 arranged along the circumferential direction of the rotor punching sheet 1; the radial magnet slots 11 extend along the radial direction of the rotor punching sheet 1, and the tangential magnet slots 12 extend along the tangential direction of the rotor punching sheet 1; the radial magnet slots 11 and the tangential magnet slots 12 are arranged alternately, and magnets are arranged in the radial magnet slots 11 and the tangential magnet slots 12; each magnetic pole is composed of a hybrid magnetic circuit formed by two adjacent radial magnets 21 and a tangential magnet 22 arranged between the two radial magnets 21, and the provided magnetic flux directions are the same, which increases the magnetic concentration effect and improves the utilization rate of magnets;

[0040] The rotor punching sheet 1 has radial magnet slots 11 and tangential magnet slots 12, and is respectively provided with radial magnets 21 and tangential magnets 22; by adopting this radial and tangential hybrid arrangement of magnets, the effective area of each pole magnet is greatly increased, the magnetic flux of each pole is increased, the stator current and winding loss during torque output are reduced, and the motor efficiency is improved;

[0041] The width of the radial magnet 21 is L1, the width of the tangential magnet 22 is L2, and the width of each magnetic pole is 2*L1 + L2; when the rotor constitutes a rotor with N magnetic poles, the total width of the magnets used in the rotor is L3 = N*(L1 + L2); when the rotor punching sheet is applied to a compressor, the total displacement of the compressor is Vmm 3 , 0.2 ≤ V / L3 ≤ 0.4.

[0042] Preferably, the width of the radial magnet 21 is smaller than the width of the tangential magnet 22, where 0.22 ≤ L1 / L2 ≤ 0.39.

[0043] Preferably, when the rotor is in a demagnetizing magnetic field, the radial permanent magnets 21 are on a path with a shorter demagnetizing magnetic circuit, and are subject to a larger demagnetizing magnetic potential, presenting a greater demagnetizing risk. To balance the demagnetization resistance of each part of the permanent magnets, the thickness of the radial permanent magnets 21 is H1, and the thickness of the tangential permanent magnets 22 is H2. The thickness of the radial permanent magnets 21 is greater than that of the tangential permanent magnets 22, where 1 ≤ H1 / H2 ≤ 1.4, to improve the demagnetization resistance of the radial permanent magnets 21.

[0044] Preferably, a plurality of flow-through grooves 16 are provided along the circumferential direction of the rotor punching 1 to reduce the exhaust resistance and axial movement; the number of the flow-through grooves 16 matches the number of poles of the rotor; the total area of the flow-through grooves is S mm 2 , to ensure that the high-pressure refrigerant after the compressor can smoothly flow through the flow-through grooves 16 of the rotor 33, reduce the exhaust loss of the compressor, and improve the energy efficiency of the compressor, it should satisfy 0.25 ≤ V / S ≤ 0.4;

[0045] Specifically, the flow-through grooves 16 are of an approximate triangular structure, which penetrate along the axial direction of the rotor, and a plurality of flow-through grooves 16 are arranged regularly along the circumference; the flow-through grooves 16 are arranged inside the tangential permanent magnet grooves 12 and are close to the tangential permanent magnet grooves 12, and at least a part of the flow-through grooves 16 points to the tangential permanent magnet grooves 12; the refrigerant can flow in the flow-through grooves 16, reducing the exhaust resistance and axial movement, and improving the energy efficiency of the compressor.

[0046] Preferably, the radial permanent magnet grooves 11 extend from the ends of two adjacent tangential permanent magnet grooves 12 to the edge of the rotor punching 1; the radial permanent magnets 21 on both sides of the tangential permanent magnet 22 are axially symmetrically arranged with respect to the tangential permanent magnet 22; specifically, the radial permanent magnet grooves 11 and the tangential permanent magnet grooves 12 are of a square structure; there is a first magnetic isolation bridge 111 between the radial permanent magnet grooves 11 and the edge of the rotor punching 1, and the size of the first magnetic isolation bridge 111 is relatively narrow, having a good magnetic isolation effect.

[0047] Preferably, the magnetization direction of the tangential permanent magnet 22 is the radial direction of the rotor, providing the N-pole or S-pole magnetic flux of the magnetic pole.

[0048] Preferably, a first magnetic isolation groove group 13 and a second magnetic isolation groove group 14 are formed on the rotor punching 1. The first magnetic isolation groove group 13 is arranged near the radial permanent magnet grooves 11 and corresponds to the number of the radial permanent magnet grooves 11; the second magnetic isolation groove group 14 is arranged near the edge of the rotor punching 1 and corresponds to the number of the tangential permanent magnet grooves 12; the first magnetic isolation groove group 13 and the second magnetic isolation groove group 14 can optimize the magnetic resistance of the rotor magnetic circuit, control the distribution of the magnetic field magnetic force lines, and weaken the concentration degree of the magnetic field magnetic force lines, thereby reducing the pulsation of the motor output torque.

[0049] Preferably, the first magnetic isolation groove group 13 has an even number of first magnetic isolation grooves 131, and at least one first magnetic isolation groove 131 is provided on each side of each radial magnet groove 11 to reduce the reverse magnetic field magnetization intensity at the easily demagnetized part of the rotor. Specifically, the first magnetic isolation groove group 13 is arranged between the tangential magnet groove 12 and the edge of the rotor punching 1, and the first magnetic isolation groove 131 extends tangentially and is perpendicular to the corresponding radial magnet groove 11.

[0050] Preferably, the second magnetic isolation groove group 14 has a plurality of second magnetic isolation grooves 141, and at least one second magnetic isolation groove 141 is provided outside each tangential magnet 12 and close to the edge of the rotor punching 1, which can improve the torque noise index of the motor. Specifically, the second magnetic isolation groove 141 extends radially and is perpendicular to the corresponding tangential magnet groove 12; the second magnetic isolation groove 141 is slender, which can improve the torque noise index of the motor, thereby reducing the noise during the operation of the motor.

[0051] Preferably, a third magnetic isolation groove 15 is further formed on the rotor punching 1; the third magnetic isolation groove 15 is arranged between the ends of two adjacent tangential magnet grooves 12 and communicates with the radial magnet groove 11; the number of the third magnetic isolation grooves 15 corresponds to the number of the tangential magnet grooves 12. Specifically, a second magnetic isolation bridge is formed on one side of the third magnetic isolation groove 15 close to the end of the tangential magnet groove 12; the size of the second magnetic isolation bridge is narrow, and it has a good magnetic isolation effect.

[0052] Preferably, the radial magnet 21 and the tangential magnet 22 have the same grade, and there is no need to improve the grade of the magnet to improve the efficiency and anti-demagnetization ability of the motor.

[0053] In this embodiment, the rotor punching 1 is formed with 6 tangential magnet grooves 12 and 6 radial magnet grooves 11, and thus the rotor can form 6 magnetic poles; the rotor punching is formed with 6 first magnetic isolation groove groups 13, 6 second magnetic isolation groove groups 14, 6 third magnetic isolation grooves and 6 circulation grooves 16.

[0054] Preferably, a shaft hole 18 is formed at the center of the rotor punching 1, which is concentric with the outer circle of the rotor punching 1 and is used for connecting the rotor 33 and the shaft; a plurality of mounting holes 17 are provided in the circumferential direction of the rotor 33 and are used for connecting the rotor punchings 1. Specifically, the mounting holes 17 are rivet holes, and the plurality of mounting holes 17 are arranged regularly along the circumference; the mounting holes 17 and the circulation grooves 16 are arranged alternately.

[0055] <Motor>

[0056] As Figure 2a and Figure 2bAs shown in the figure, the motor 3 provided in this embodiment has a housing 31, a stator 32, a rotor 33, and a rotor baffle 332. The stator 32 is composed of a stator core 321 and a stator winding 322, and is disposed within the housing 31. The stator core 321 is formed by axially laminating multiple layers of stator punching sheets; the rotor 33 has a permanent magnet and a rotor core 331, where the rotor core 331 is axially laminated by the aforementioned rotor punching sheets 1; the permanent magnet is disposed within the radial permanent magnet slots 11 and the tangential permanent magnet slots 12; each magnetic pole is composed of a hybrid magnetic circuit formed by two adjacent radial permanent magnets 21 and a tangential permanent magnet 22 between the two radial permanent magnets 21; the rotor baffle 34 is disposed on both end faces of the rotor core 331.

[0057] When the above motor is applied to a compressor, the compressor can achieve a relatively high power density, and a small series of outer diameter compressors can be used to meet the requirements of refrigeration capacity and energy efficiency. The total displacement of the compressor is Vmm 3 , where 0.2 ≤ V / L3 ≤ 0.4, the utilization rate of the permanent magnet is in a relatively optimal range, which can fully reduce the amount of permanent magnet used; the outer diameter of the stator 32 can also be reduced. The outer diameter of the stator 32 is D1, where 0.2 ≤ V / D1 ≤ 0.25; to reduce the low-frequency rotational speed fluctuation of the motor, the moment of inertia of the rotor 33 can be increased. The outer diameter of the rotor 33 is D2, where 0.35 ≤ V / D2 ≤ 0.45; the outer diameter of the rotor 33 is at a relatively optimal level, the moment of inertia meets the requirements, and the vibration and noise are significantly reduced.

[0058] The above specifically shows and describes the exemplary embodiments of the present disclosure. It should be understood that the present disclosure is not limited to the detailed structures, settings, or implementation methods described herein; on the contrary, the present disclosure is intended to cover various modifications and equivalent settings included within the spirit and scope of the appended claims.

Claims

1. A rotor punching sheet, characterized in that, It has a plurality of radial magnet slots and a plurality of tangential magnet slots arranged circumferentially along the rotor punching sheet; the radial magnet slots extend radially along the rotor punching sheet, and the tangential magnet slots extend tangentially along the rotor punching sheet; the radial magnet slots and the tangential magnet slots are arranged alternately, and magnets are provided in the radial magnet slots and the tangential magnet slots; each magnetic pole is composed of a hybrid magnetic circuit formed by two adjacent radial magnets and a tangential magnet disposed between the two radial magnets, and the provided magnetic flux directions are the same; The width of the radial permanent magnet is L1, and the width of the tangential permanent magnet is L2; when the rotor forms a rotor with N magnetic poles, the total width of the permanent magnets used for the rotor is L3 = N * (L1 + L2); when the rotor punching sheet is applied to a compressor, the total displacement of the compressor is Vmm 3 , where 0.2 ≤ V / L3 ≤ 0.

4.

2. The rotor punching sheet according to claim 1, wherein, The radial magnet slots extend from the ends of two adjacent tangential magnet slots to the edge of the rotor punching sheet; the radial magnets on both sides of the tangential magnet are symmetrically arranged with respect to the tangential magnet.

3. The rotor punching sheet according to claim 1, characterized in that, The width of the radial magnet is less than the width of the tangential magnet, where 0.22 ≤ L1 / L2 ≤ 0.

39.

4. The rotor punching sheet according to claim 1, wherein The thickness of the radial magnet is H1, and the thickness of the tangential magnet is H2. The thickness of the radial magnet is greater than the thickness of the tangential magnet, where 1 ≤ H1 / H2 ≤ 1.

4.

5. The rotor punching sheet according to claim 1, characterized in that, A plurality of flow channels are provided along the circumferential direction of the rotor punching sheet; the total area of the flow channels is S mm 2 ; where 0.25 ≤ V / S ≤ 0.

4.

6. The rotor punching sheet according to claim 1, wherein First magnetic isolation slot groups and second magnetic isolation slot groups are formed on the rotor punching sheet; the first magnetic isolation slot groups are arranged near the radial magnet slots and correspond to the number of the radial magnet slots; the second magnetic isolation slot groups are arranged near the edge of the rotor punching sheet and correspond to the number of the tangential magnet slots.

7. The rotor punching sheet according to claim 6, characterized in that, The first magnetic isolation slot groups have an even number of first magnetic isolation slots, and at least one first magnetic isolation slot is respectively arranged on both sides of each radial magnet slot.

8. The rotor punching sheet according to claim 6, wherein, The second magnetic isolation slot groups have a plurality of second magnetic isolation slots, and at least one second magnetic isolation slot is arranged outside each tangential magnet slot and near the edge of the rotor punching sheet.

9. The rotor punching sheet according to claim 1, wherein A third magnetic isolation slot is further formed on the rotor punching sheet; the third magnetic isolation slot is arranged between the ends of two adjacent tangential magnet slots and communicates with the radial magnet slots; the number of the third magnetic isolation slots corresponds to the number of the tangential magnet slots.

10. The rotor punching sheet according to claim 1, characterized in that, The radial magnet and the tangential magnet have the same grade.

11. A rotor, characterized in that, It has a magnet and a rotor core laminated by the rotor punching sheets according to any one of claims 1-10; the magnet is arranged in the radial magnet slots and the tangential magnet slots.

12. A motor, characterized in that, It has a housing, a stator installed in the housing, and the rotor according to claim 11.

13. A compressor, characterized in that, It has the motor according to claim 12.

14. The compressor according to claim 13, characterized in that, The outer diameter of the stator is D1, and the outer diameter of the rotor is D2, where 0.2 ≤ V / D1 ≤ 0.25, 0.35 ≤ V / D2 ≤ 0.45.

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