Rotor assembly, motor, compressor and refrigeration equipment

Abstract

The utility model discloses a rotor assembly, a motor, a compressor and refrigeration equipment, and relates to the technical field of motors, the rotor assembly comprises a rotor core and a plurality of magnetic steel groups; the rotor iron core is formed by stacking a plurality of rotor punching sheets; the plurality of magnetic steel groups are distributed along the circumferential direction of the rotor core, one magnetic steel group comprises a first magnet and two second magnets, the end parts of the second magnets and the first magnets are adjacent, magnet air slots are arranged at intervals, the second magnets and the first magnets are connected at an outward included angle, and the two second magnets are symmetrically arranged around the radial direction of the rotor punching sheet; wherein the included angle between the second magnet and the first magnet is theta, the length of the first magnet on the rotor punching sheet is L1, the radial distance between the first magnet and the periphery of the rotor punching sheet is h, the number of pole pairs of the rotor assembly is p, and L1 / h * (pi / p / theta) is larger than or equal to 0.2 and smaller than or equal to 0.4. According to the technical scheme provided by the utility model, the magnetic gathering effect of the rotor is improved by limiting the shape and the position of the magnetic steel group, so that the loss is reduced, and the efficiency of the motor or the compressor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a rotor assembly, a motor, a compressor and a refrigeration device. Background Art

[0002] In the field of motor technology, the design of the rotor structure is a key factor affecting the efficiency of the motor. Reasonable optimization of the rotor design can effectively reduce losses and improve efficiency. In related technologies, the rotor magnet is embedded, but the main magnetic flux of the motor cannot be further improved. The performance requirements can only be met by increasing the length of the body. Moreover, when the motor speed increases, it cannot output the required torque. Utility Model Content

[0003] The main purpose of the utility model is to propose a rotor assembly, a motor, a compressor and a refrigeration device, which improve the magnetic focusing effect of the rotor by limiting the shape and position of the magnetic steel group, thereby reducing losses and improving the efficiency of the motor or compressor.

[0004] To achieve the above-mentioned purpose, the rotor assembly proposed by the utility model comprises:

[0005] A rotor core, wherein the rotor core is formed by stacking a plurality of rotor punching sheets; and

[0006] A plurality of magnetic steel groups, wherein the plurality of magnetic steel groups are distributed along the circumference of the rotor core, wherein one magnetic steel group comprises a first magnet and two second magnets, wherein the second magnet and the first magnet are adjacent to each other at their ends on the rotor punching sheet and are separated by a magnet air slot, wherein the second magnet and the first magnet are connected at an angle with their openings facing the outer circumference of the rotor punching sheet, and the two second magnets of one magnetic steel group are symmetrically arranged around the radial direction of the rotor punching sheet;

[0007] Among them, the angle between the second magnet and the first magnet is θ, the length of the first magnet on the rotor punching is L1, the radial spacing from the first magnet to the outer periphery of the rotor punching is h, and the number of pole pairs of the rotor assembly is p, satisfying: 0.2≤L1÷h×(π÷p÷θ)≤0.4.

[0008] In one embodiment, the θ, the L1, the h and the p further satisfy: 0.22≤L1÷h×(π÷p÷θ)≤0.3.

[0009] In one embodiment, the length of the second magnet on the rotor punching sheet is L2, and L1 and L2 satisfy: 0.27≤L1÷L2≤1.

[0010] In one embodiment, the rotor core is provided with an inter-pole air slot between two adjacent magnetic steel groups, and the inter-pole air slot is arranged adjacent to the outer periphery of the rotor punching sheet.

[0011] In one embodiment, the area of ​​the inter-electrode air groove is S, satisfying: 4mm2≤S≤6mm2.

[0012] In one embodiment, the rotor core is further provided with a plurality of flux guide grooves along the axial direction on the side of the magnetic steel group facing the outer periphery of the rotor punching, and the flux guide grooves on the rotor punching extend between the magnetic steel group and the outer periphery of the rotor punching.

[0013] In one embodiment, on the rotor punching sheet, the outer circumference of the rotor punching sheet is formed by connecting circular arcs, or connecting circular arcs and straight lines.

[0014] The utility model also provides a motor, which comprises a stator and a rotor assembly as described above, wherein the rotor assembly is rotatably inserted into the stator.

[0015] In one embodiment, the inner diameter of the stator is D1, the outer diameter of the stator is D2, and D1 and D2 satisfy: 0.51≤D1÷D2≤0.59.

[0016] The utility model also provides a compressor, which comprises a stator and a rotor assembly as described above, wherein the rotor assembly is rotatably inserted in the stator.

[0017] The utility model also provides a refrigeration device, which includes the motor as described above, or includes the compressor as described above.

[0018] The technical solution of the utility model divides the magnetic steel group of a magnetic pole into three sections in the circumferential direction, namely a first magnet and two second magnets, and forms a U-shaped structure with an opening toward the outer periphery of the rotor punching sheet. The first magnet is perpendicular to the radial direction of the rotor punching sheet, and the two second magnets of the magnetic steel group are symmetrically distributed with the radial direction as the symmetry axis, so that the two second magnets have equal angles with the first magnet, both of which are θ. In this way, by limiting the ratio of θ to π÷p and the ratio of L1 to h to satisfy: 0.2≤L1÷h×(π÷p÷θ)≤0.4, the radial position of the magnetic steel group on the rotor punching sheet is in a position with better magnetic flux, combined with the magnet air slot between the first magnet and the second magnet, to form independent magnetic flux guiding effects on the first magnet and the second magnet respectively, and reduce the magnetic leakage of the magnetic steel group, thereby improving the magnetic concentration of the magnetic steel group, and then reducing the unevenness and mutation in the magnetic field, thereby reducing the eddy current loss and iron loss in the magnetic steel, and improving the efficiency of the motor or compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 A schematic structural diagram of a cross-section of an embodiment of a rotor assembly provided by the utility model;

[0021] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0022] Figure 3 A schematic diagram of the cross-sectional structure of the rotor assembly and the stator provided by the utility model;

[0023] Figure 4 is a schematic structural diagram of a cross section of an existing rotor assembly;

[0024] Figure 5 A comparison diagram of the losses of the rotor assembly provided by the utility model and the existing rotor assembly;

[0025] Figure 6 A comparison chart of the efficiency of the rotor assembly provided by the utility model and the existing rotor assembly.

[0026] Description of Figure Numbers:

[0027] 100, rotor punching; 110, magnet air slot; 120, inter-pole air slot; 130, magnetic flux guide slot;

[0028] 210. First magnet; 220. Second magnet; 300. Stator.

[0029] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0033] Please refer to Figure 4 In the prior art, the magnet is embedded in the rotor core in a V-shape to change the density of the magnetic field in the rotor core to improve the magnetic focusing effect of the rotor, thereby improving the efficiency of the motor or compressor. However, the main magnetic flux of the V-shaped magnet cannot be further improved. Relevant technicians usually increase the residual magnetism of the magnet or increase the length of the rotor to meet the performance requirements, but this method cannot reduce the iron loss or eddy loss of the rotor. When the motor speed increases, it cannot output the required torque.

[0034] The utility model provides a rotor assembly.

[0035] See also Figures 1 to 3 In one embodiment of the present utility model, the rotor assembly comprises:

[0036] A rotor core, wherein the rotor core is formed by stacking a plurality of rotor sheets 100; and

[0037] Multiple magnetic steel groups, multiple magnetic steel groups are distributed along the circumference of the rotor core, one magnetic steel group includes a first magnet 210 and two second magnets 220, on the rotor punching 100, the second magnet 220 and the first magnet 210 are adjacent to each other at the end, and are separated by a magnet air slot 110, the second magnet 220 and the first magnet 210 are connected at an angle with the opening facing the outer periphery of the rotor punching 100, and the two second magnets 220 of one magnetic steel group are symmetrically arranged around the radial direction of the rotor punching 100;

[0038] Among them, the angle between the second magnet 220 and the first magnet 210 is θ, the length of the first magnet 210 on the rotor punching 100 is L1, the radial spacing from the first magnet 210 to the outer periphery of the rotor punching 100 is h, and the number of pole pairs of the rotor assembly is p, satisfying: 0.2≤L1÷h×(π÷p÷θ)≤0.4.

[0039] The technical solution of the utility model divides the magnetic steel group of a magnetic pole into three sections in the circumferential direction, namely the first magnet 210 and the two second magnets 220, and forms a U-shaped structure with an opening toward the outer periphery of the rotor punching 100. The first magnet 210 is perpendicular to the radial direction of the rotor punching 100, and the two second magnets 220 of the magnetic steel group are symmetrically distributed with the radial direction as the symmetry axis, so that the two second magnets 220 are respectively equal to the first magnet 210. The angle is θ, so that by limiting the ratio of θ to π÷p and the ratio of L1 to h, Sufficient: 0.2≤L1÷h×(π÷p÷θ)≤0.4, so that the radial position of the magnetic steel group on the rotor punching 100 is at a position with better magnetic flux, combined with the magnet air slot 110 between the first magnet 210 and the second magnet 220, to form an independent magnetic flux guiding effect on the first magnet 210 and the second magnet 220 respectively, and reduce the magnetic leakage of the magnetic steel group, thereby improving the magnetic concentration of the magnetic steel group, and then reducing the unevenness and mutation in the magnetic field, thereby reducing the eddy current loss and iron loss in the magnetic steel, and improving the efficiency of the motor or compressor.

[0040] Please refer to Figure 5 Compared with the existing V-shaped magnetic steel group, the magnetic steel group in this embodiment has a better position of the magnetic flux and a better magnetic focusing effect under the condition of 0.2≤L1÷h×(π÷p÷θ)≤0.4. In this way, the magnetic flux distribution in the circumferential direction is better, which improves the uniformity of the magnetic field and reduces the eddy current loss of the motor. At the same time, the magnetic field changes more smoothly, which also helps to reduce the hysteresis loss and thus reduce the iron loss of the motor. For example, when the position of the magnetic steel group changes toward the outer periphery of the rotor punching 100, the length L1 of the first magnet 210 becomes smaller, and the radial spacing h from the first magnet 210 to the outer periphery of the rotor punching 100 also becomes smaller, and the two change synchronously or nearly synchronously. At this time, L1÷h remains unchanged or slightly larger or slightly smaller, and the angle θ between the first magnet 210 and the second magnet 220 increases. At this time, L1÷h×(π÷p÷θ) tends to increase. Similarly, when the position of the magnetic steel group changes toward the rotation center of the rotor punching 100, L1÷h×(π÷p÷θ) tends to decrease. Of course, defining θ and p as a reference is equivalent to defining θ and the number of poles of the rotor assembly as a reference when converting numerical values. In this way, referring to Figure 6, while reducing eddy current loss and iron loss, the same volume of the magnetic steel group, the efficiency of the motor or compressor in this embodiment is also improved compared with the magnetic steel group arranged in a V shape. Specifically, the shape and position of the magnetic steel group in this scheme are compared with the V-shaped magnetic steel group. The eddy current loss of the motor or compressor is reduced from 1.441w to 1.288w, and the iron loss is reduced from 9.87w to 9.34w, which is reflected in the efficiency of the motor or compressor being improved from 92.66% to 93.01%.

[0041] In one embodiment, please refer to Figures 1 to 3 , θ, L1, h and p also satisfy: 0.22≤L1÷h×(π÷p÷θ)≤0.3. It can be understood that in this embodiment, L1÷h×(π÷p÷θ) is limited to a smaller value, so as to move the first magnetic steel toward the center of the rotor punching 100. In this way, the volume of the inter-magnetic air slot is relatively increased, and the ability to suppress the magnetic leakage of the first magnet 210 and the second magnet 220 is improved, and the magnetic permeability channel of the iron core of the rotor assembly is more fully utilized to further optimize the magnetic permeability effect, so that the distribution of the magnetic field is more uniform, and the change of the magnetic flux is smoother, thereby reducing eddy current loss and iron loss, and improving the efficiency of the motor or compressor. Specifically, the value of L1÷h×(π÷p÷θ) can be 0.22, 0.25, 0.3, 0.35 or 0.4.

[0042] In one embodiment, please refer to Figures 1 to 3 , the length of the second magnet 220 on the rotor punching 100 is L2, and L1 and L2 satisfy: 0.27≤L1÷L2≤1. It can be understood that in this embodiment, the length of the first magnet 210 on the rotor punching 100 is set to be smaller than the length of the second magnet 220 on the rotor punching 100, which increases the radial inclination of the second magnet 220 relative to the rotor punching 100. At this time, θ is larger, L1÷h is smaller, and L1÷h×(π÷p÷θ) satisfies the range of 0.2 to 0.4, ensuring the uniformity of the magnetic field distribution and the smoothness of the magnetic field change, thereby reducing eddy current loss and iron loss, and improving the efficiency of the motor or compressor. In addition, while ensuring efficiency, the volume of the first magnet 210 is reduced to save costs. Of course, in other embodiments, while ensuring 0.2≤L1÷h×(π÷p÷θ)≤0.4, it can also be satisfied: 1 <L1÷L2≤1.5。

[0043] In one embodiment, please refer to Figures 1 to 3, between two adjacent magnetic steel groups, the rotor core is provided with an interpolar air slot 120, and the interpolar air slot 120 is arranged adjacent to the outer periphery of the rotor sheet 100. It can be understood that the interpolar air slot 120 is arranged adjacent to the second magnet 220. For the second magnet 220, the interpolar air slot 120 forms a guide for the conduction direction of the magnetic wire, so that the distribution of the magnetic field is more uniform and the change of the magnetic flux is smoother, thereby improving the magnetic concentration effect of the motor. At the same time, the interpolar air slot 120 also reduces the magnetic leakage of the end of the second magnet 220 adjacent to the outer periphery of the rotor sheet 100, thereby ensuring the magnetic flux of the second magnet 220. Specifically, the interpolar air slot 120 can be a single slot setting or a plurality of slots setting. According to the purpose of magnetic conduction and the requirements of magnetic field distribution, the area and distribution of the interpolar air slot 120 are set in a targeted manner to ensure the magnetic concentration effect, thereby improving the efficiency of the motor or compressor.

[0044] Further, in this embodiment, please refer to Figures 1 to 3 , the area of ​​the interpolar air slot 120 is S, and S satisfies: 4mm2≤S≤6mm2. Without loss of generality, the interpolar air slot 120 is arranged adjacent to the outer periphery of the rotor assembly. In the specifications of the rotor punching 100 of this embodiment, the area of ​​the magnetic steel slot is limited to between 4mm2 and 6mm2, so that the interpolar air slot 120 can be better filled between adjacent magnetic steel groups, ensuring the interpolar air slot 120 to the second magnet 220 The role of magnetic conductivity and suppression of magnetic leakage improves the uniformity of the magnetic field distribution of the rotor assembly, thereby improving the efficiency of the motor or compressor. Of course, for rotor punchings 100 of different specifications, referring to the gap size between adjacent magnetic steel groups, the area S of the interpolar air slot 120 can be greater than 6mm2 or less than 4mm2.

[0045] In one embodiment, please refer to Figures 1 to 3On the side of the magnetic steel group facing the outer periphery of the rotor sheet 100, the rotor core is further provided with a plurality of magnetic flux guide grooves 130 along the axial direction. On the rotor sheet 100, the magnetic flux guide grooves 130 extend between the magnetic steel group and the outer periphery of the rotor sheet 100. It can be understood that the plurality of magnetic flux guide grooves 130 are provided on the side of the magnetic steel group facing the outer periphery of the rotor sheet 100, which will form a good magnetic flux guiding effect on the first magnet 210 and the second magnet 220 of the same magnetic steel group, so as to evenly and adaptively distribute the magnetic field, and at the same time, also improve the smoothness of magnetic flux switching, improve magnetic concentration, reduce eddy current loss and iron loss, and thus improve the efficiency of the motor or compressor. Specifically, the magnetic flux guide groove 130 is arranged in a long strip shape on the rotor punching 100, and the corner is configured as an arc angle, and extends between the magnetic steel group and the outer periphery of the rotor punching 100. At the same time, from the angle between the second magnet 220 and the outer periphery of the rotor punching 100 to the position direction of the first magnet 210 on the outer periphery of the rotor punching 100, the extension length of the magnetic flux guide groove 130 gradually increases, thereby ensuring the effect of magnetic flux guidance. Of course, in other embodiments, the magnetic flux guide groove 130 can also be circular or multi-groove distribution to meet the specific magnetic concentration purpose of the rotor punching 100.

[0046] In one embodiment, please refer to Figures 1 to 3 On the rotor punching 100, the outer periphery of the rotor punching 100 is formed by connecting arcs, or, connecting arcs and straight lines. It should be noted that when the rotor assembly rotates at high speed, it is necessary to achieve a certain dynamic balance to reduce vibration and noise. The combination of arc edges and straight lines can help achieve this balance, and the overall performance of the rotor assembly can be optimized by adjusting the mass and shape of different parts. At the same time, for the rotor assembly applied to the compressor, the rotor assembly needs to provide refrigeration oil and refrigerant flow, that is, the rotor assembly works in a fluid (such as air or liquid), and the shape of its outer periphery will affect the flow of the fluid. The combination of arc edges and straight lines can be designed into a specific shape to improve fluid dynamics, such as reducing resistance, increasing lift or improving heat dissipation. Thereby optimizing the performance of the rotor assembly, reducing stress concentration, making the rotor assembly more stable and reliable when rotating at high speed, thereby improving the operating efficiency of the motor or compressor.

[0047] The utility model also provides a motor, which includes a rotor assembly and a stator 300. The specific structure of the rotor assembly refers to the above embodiment. Since the motor adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the rotor assembly is rotatably inserted into the center hole of the stator 300.

[0048] In one embodiment, please refer to Figure 3, the inner diameter of the stator 300 is D1, the outer diameter of the stator 300 is D2, and D1 and D2 satisfy: 0.51≤D1÷D2≤0.59. It can be understood that the stator 300 is a large inner diameter stator 300 structure, the volume of the magnetic steel group is large, and the output torque is strong, thereby improving the load capacity of the motor. Among them, D1÷D2≤0.59 is limited to avoid the inner diameter of the stator 300 being too large, resulting in a decrease in the speed of the motor's rotor assembly, thereby reducing the efficiency of the motor, and the stator 300 The inner diameter is too large may cause the motor's rotor assembly to be unbalanced and unstable, thereby generating unnecessary vibration and noise. Similarly, the limit of 0.51≤D1÷D2 is used to prevent the inner diameter of the stator 300 from being too small, which may easily lead to the narrowing of the heat dissipation channel, limit the heat dissipation, and make the motor more prone to overheating during operation. A stator 300 with a too small inner diameter may also lead to uneven magnetic field distribution, especially in the tooth slot area of ​​the stator 300, which may produce a large change in magnetic flux density, causing the motor to generate additional iron loss and noise. In addition, the uneven magnetic field distribution will also affect the efficiency and stability of the motor.

[0049] The utility model also provides a compressor, which includes a rotor assembly and a stator 300. The specific structure of the rotor assembly refers to the above embodiment. Since the compressor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Figure 3 As shown, the outer periphery of the stator 300 is fixed to the compressor housing, and the refrigeration oil and refrigerant in the compressor are directly passed through the flow holes of the rotor punching 100 to achieve energy circulation; or, the outer periphery of the stator 300 is fixed to the motor housing, and then the motor is installed in the compressor housing.

[0050] The utility model also proposes a refrigeration device, which includes a motor or a compressor. The specific structure of the motor or the compressor refers to the above embodiment. Since the refrigeration device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0051] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A rotor assembly, characterized in that: include: A rotor core, wherein the rotor core is formed by stacking a plurality of rotor punching sheets; as well as A plurality of magnetic steel groups, wherein the plurality of magnetic steel groups are distributed along the circumference of the rotor core, wherein one magnetic steel group comprises a first magnet and two second magnets, wherein the second magnet and the first magnet are adjacent to each other at their ends on the rotor punching sheet and are separated by a magnet air slot, wherein the second magnet and the first magnet are connected at an angle with their openings facing the outer circumference of the rotor punching sheet, and the two second magnets of one magnetic steel group are symmetrically arranged around the radial direction of the rotor punching sheet; Among them, the angle between the second magnet and the first magnet is θ, the length of the first magnet on the rotor punching is L1, the radial spacing from the first magnet to the outer periphery of the rotor punching is h, and the number of pole pairs of the rotor assembly is p, satisfying: 0.2≤L1÷h×(π÷p÷θ)≤0.

4.

2. The rotor assembly according to claim 1, characterized in that The θ, the L1, the h and the p further satisfy: 0.22≤L1÷h×(π÷p÷θ)≤0.

3.

3. The rotor assembly according to claim 1, characterized in that: The length of the second magnet on the rotor punching sheet is L2, and L1 and L2 satisfy: 0.27≤L1÷L2≤1.

4. The rotor assembly according to claim 1, wherein: The rotor core is provided with an interpolar air slot between two adjacent magnetic steel groups, and the interpolar air slot is arranged adjacent to the outer periphery of the rotor punching sheet.

5. The rotor assembly according to claim 4, characterized in that The area of ​​the inter-electrode air groove is S, and S satisfies: 4mm2≤S≤6mm2.

6. The rotor assembly according to claim 1, wherein: The rotor core is further provided with a plurality of flux guide grooves along the axial direction on the side of the magnetic steel group facing the outer periphery of the rotor punching. On the rotor punching, the flux guide grooves extend between the magnetic steel group and the outer periphery of the rotor punching.

7. The rotor assembly according to any one of claims 1 to 6, characterized in that: On the rotor punching sheet, the outer circumference of the rotor punching sheet is formed by connecting circular arcs, or connecting circular arcs and straight lines.

8. A motor, characterized in that: The invention comprises a stator and a rotor assembly as claimed in any one of claims 1 to 7, wherein the rotor assembly is rotatably inserted into the stator.

9. The motor according to claim 8, characterized in that The inner diameter of the stator is D1, the outer diameter of the stator is D2, and D1 and D2 satisfy: 0.51≤D1÷D2≤0.

59.

10. A compressor, characterized in that: The invention comprises a stator and a rotor assembly as claimed in any one of claims 1 to 7, wherein the rotor assembly is rotatably inserted into the stator.

11. Refrigeration equipment, characterized in that Comprising the motor as claimed in claim 8 or 9, or, comprising the compressor as claimed in claim 10.

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