Stator and rotor punching sheet, motor, compressor and air conditioner

Abstract

The utility model discloses a stator and rotor punching sheet, a motor, a compressor and an air conditioner, and the stator and rotor punching sheet comprises a rotor punching sheet which is provided with a plurality of magnet grooves suitable for accommodating magnetic parts, and the plurality of magnet grooves are arranged at intervals in the circumferential direction of the rotor punching sheet; wherein the sum of the groove areas of the plurality of magnet grooves is S1, the outer diameter of the rotor punching sheet is D1, the number of poles of the rotor punching sheet is P, the shortest distance from the circle center of the rotor punching sheet to each magnet groove is L1, and # imgabs0 # is satisfied according to the stator and rotor punching sheet disclosed by the embodiment of the invention, and the stator and rotor punching sheet has the characteristic of high rotational inertia of a rotor; therefore, low-frequency stable operation is realized.

Description

Technical Field

[0001] The present application relates to the field of compressors, and in particular to a stator and rotor punching sheet, a motor, a compressor and an air conditioner. Background Art

[0002] In the related technologies, the compressor is the heart of the air conditioning system. High power density and low noise have always been the key research topics of the compressor industry. In recent years, in response to the national policy requirements of energy conservation and emission reduction, the high power density topic has not made any substantial breakthroughs due to the high technical difficulty, and the product gross profit has not reached the leading level. As an important component of the compressor, the permanent magnet motor plays the most important role in noise performance and energy efficiency performance. Existing permanent magnet motors all have the problem of excessive noise. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present application is to provide a stator and rotor punching, which has the characteristics of high rotor rotational inertia, thereby achieving low-frequency stable operation.

[0004] The present application also proposes a motor having the above-mentioned stator and rotor punching sheets.

[0005] The present application also provides a compressor having the above motor.

[0006] The present application also provides an air conditioner having the compressor.

[0007] According to the embodiment of the present application, the stator and rotor punching comprises: a rotor punching, on which a plurality of magnet slots suitable for accommodating magnetic parts are formed, and the plurality of magnet slots are arranged at intervals in the circumferential direction of the rotor punching; wherein the sum of the slot areas of the plurality of magnet slots is S1, the outer diameter of the rotor punching is D1, the number of poles of the rotor punching is P, the shortest distance from the center of the rotor punching to each of the magnet slots is L1, and the following conditions are satisfied:

[0008] According to the stator and rotor punchings of the embodiment of the present application, the stator and rotor punchings include rotor punchings, on which magnet slots are formed which are arranged at intervals in the circumferential direction and are used to accommodate magnetic parts, the sum of the slot areas of the multiple magnet slots is S1, the outer diameter of the rotor punching is D1, the number of poles of the rotor punching is P, the shortest distance from the center of the rotor punching to each magnet slot is L1, and the sum of the slot areas of the multiple magnet slots, the outer diameter of the rotor punching, the number of poles of the rotor punching and the shortest distance from the center of the rotor punching to each magnet slot satisfy: By setting the above relationship within the above range, it can be ensured that the stator and rotor punchings can increase the rotor's rotational inertia, improve the stability of the motor's low-frequency operation, and still maintain the maximum output torque under the condition of a small amount of magnetic parts, thereby greatly improving the motor's output torque and the noise generated by the motor's operation to meet usage requirements.

[0009] In some embodiments of the present application, the outer diameter of the rotor punching satisfies: D1 ≥ 59 mm.

[0010] In some embodiments of the present application, the number of poles of the rotor punching sheet satisfies: P≥10.

[0011] In some embodiments of the present application, the sum of the slot areas of the plurality of magnet slots satisfies: S1≤250mm 2 .

[0012] In some embodiments of the present application, the stator and rotor punchings further include: a stator punching, wherein the stator punching is arranged on the outer periphery of the rotor punching, the outer diameter of the stator punching is D2, and satisfies:

[0013] The following is a brief description of the motor according to an embodiment of the present application.

[0014] The motor according to the embodiment of the present application is provided with a rotor and a stator, and the rotor and the stator are formed by stacking the stator and rotor punching sheets of the above embodiment. Therefore, the rotor of the motor is formed by stacking the above multiple rotor punching sheets, the sum of the slot areas of the multiple magnet slots is S1, the outer diameter of the rotor punching sheet is D1, the number of poles of the rotor punching sheet is P, the shortest distance from the center of the rotor punching sheet to each magnet slot is L1, and the sum of the slot areas of the multiple magnet slots, the outer diameter of the rotor punching sheet, the number of poles of the rotor punching sheet, and the shortest distance from the center of the rotor punching sheet to each magnet slot satisfy: Therefore, the motor increases the rotor's moment of inertia by setting the above relationship within the above range, improves the stability of the motor's low-frequency operation, and maintains the maximum output torque under the condition of a small amount of magnetic parts, thereby greatly improving the motor's output torque and the noise generated by the motor's operation to meet usage requirements.

[0015] In some embodiments of the present application, the number of slots of the stator is Q, the number of phases of the motor is m, and the following conditions are satisfied:

[0016] In some embodiments of the present application, the number of slots of the stator satisfies: Q=15, and the number of poles of the rotor punching satisfies: P=10.

[0017] The following is a brief description of the compressor according to an embodiment of the present application.

[0018] According to the embodiment of the present application, the compressor is provided with the motor of the above embodiment. Since the compressor of the embodiment of the present application is provided with the motor of the above embodiment, the motor inside the compressor can increase the rotational inertia of the rotor, improve the stability of the motor's low-frequency operation, and still maintain the maximum output torque under the condition of a small amount of magnetic parts, thereby greatly improving the motor output torque and the noise generated by the motor, meeting the use requirements.

[0019] The following is a brief description of the air conditioner according to the embodiment of the present application.

[0020] The air conditioner according to the embodiment of the present application is provided with the compressor of the above embodiment. Since the air conditioner according to the embodiment of the present application is provided with the compressor of the above embodiment, the compressor of the air conditioner has a motor, which can increase the rotational inertia of the rotor, improve the stability of the motor's low-frequency operation, and still maintain the maximum output torque under the condition of a small amount of magnetic parts, thereby greatly improving the motor output torque and the noise generated by the motor, meeting the use requirements.

[0021] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 is a schematic structural diagram of a stator and rotor punching according to an embodiment of the present application;

[0024] Figure 2 is a schematic structural diagram of a rotor punching according to an embodiment of the present application;

[0025] Figure 3 is a rendering of the relationship between the outer diameter of the rotor punching and the sum of the slot areas of the plurality of magnet slots according to an embodiment of the present application;

[0026] Figure 4 is a rendering of the relationship between the outer diameter of the rotor punching and the maximum output torque according to an embodiment of the present application;

[0027] Figure 5 is a comparison diagram of the number of poles and electromagnetic force density of the rotor punching according to the embodiment of the present application;

[0028] Figure 6 is a structural schematic diagram of a compressor according to an embodiment of the present application;

[0029] Figure 7 It is a simplified structural diagram of an air conditioner according to an embodiment of the present application.

[0030] Reference numerals:

[0031] 10. Stator and rotor punching;

[0032] 11. rotor punching sheet; 111. magnet slot; 112. flow hole; 113. rivet hole; 12. stator punching sheet;

[0033] 20. Motor; 30. Compressor; 31. Pump body; 32. Shell; 33. Base;

[0034] 40. Air conditioner. DETAILED DESCRIPTION

[0035] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0036] Reference below Figure 1-Figure 7 The stator and rotor punching 10 according to the embodiment of the present application is described. The stator and rotor punching 10 includes a rotor punching 11. A plurality of magnet slots 111 suitable for accommodating magnetic members are formed on the rotor punching 11. The plurality of magnet slots 111 are arranged at intervals in the circumferential direction of the rotor punching 11. The sum of the slot areas of the plurality of magnet slots 111 is S1, the outer diameter of the rotor punching 11 is D1, the number of poles of the rotor punching 11 is P, the shortest distance from the center of the rotor punching 11 to each magnet slot 111 is L1, and the following conditions are satisfied:

[0037] At present, the compressor is the heart of the air conditioning system. High power density and low noise have always been the key research topics of the compressor industry. In recent years, in response to the national policy requirements of energy conservation and emission reduction, the high power density topic has not made any substantial breakthroughs due to the high technical difficulty, and the product gross profit has not reached the leading level. As an important component of the compressor, the permanent magnet motor plays the most important role in noise performance and energy efficiency performance. Existing permanent magnet motors all have the problem of excessive noise.

[0038] like Figure 1 and Figure 2As shown, specifically, the stator and rotor punching sheet 10 includes a rotor punching sheet 11, and the rotor punching sheet 11 is formed with a magnet slot 111, a flow hole 112 and a rivet hole 113 that are arranged in the thickness direction. The magnet slot 111 can be used to accommodate a magnetic member. In some embodiments, the magnetic member can be configured as a permanent magnet, and the magnet slot 111 can be configured as a plurality of magnet slots. The plurality of magnet slots 111 can be arranged at intervals in the circumferential direction of the rotor punching sheet 11, wherein the slot area of ​​each magnet slot 111 is equal, and the center of each magnet slot 111 is bent toward the center of the rotor punching sheet 11, that is, each magnet slot 111 can be configured as a "V" shape, but it is not limited to that each magnet slot 111 can be configured as a "U" shape. In a specific embodiment, the number of magnet slots 111 can be 10. However, it is not limited thereto, and the number of magnet slots 111 can be set according to the actual needs of the product, that is, the required number of magnet slots 111.

[0039] A plurality of flow holes 112 can be constructed, and the plurality of flow holes 112 can be respectively connected to the pump body 31 of the compressor 30. The oil-gas mixture generated by the pump body 31 can flow through the flow holes 112. The flow holes 112 and the magnet slots 111 can be distributed in sequence in the radial direction toward the direction away from the center of the rotor punching 11. The rivet holes 113 can play a role in fixing the rotor punching 10. The rivet holes 113 can be used to accommodate rivets. Multiple rotor punchings 11 can be stacked in sequence in the thickness direction to form a rotor core. Rivets are inserted into the rivet holes 113 to fix the multiple rotor punchings 11, thereby improving the stability of the overall structure, helping to maintain the gap accuracy between the iron rotor punchings 11, and preventing the rotor punchings 11 from being misaligned and the magnetic field from leaking.

[0040] Further, the sum of the slot areas of the plurality of magnet slots 111 is S1, the outer diameter of the rotor sheet 11 is D1, the number of poles of the rotor sheet 11 is P, the shortest distance from the center of the rotor sheet to each magnet slot 111 is L1, and the sum of the slot areas of the plurality of magnet slots 111, the outer diameter of the rotor sheet 11, the number of poles of the rotor sheet 11, and the shortest distance from the center of the rotor sheet to each magnet slot 111 satisfy the following relationship: in, can be the area of ​​each pole magnet slot 111, is the area of ​​the rotor punching 11, is the ratio of the outer diameter of the rotor sheet 11 to the shortest distance from the center of the rotor sheet 11 to each magnet slot 111. The ratio of the area of ​​each pole magnet slot 111 to the area of ​​the rotor sheet 11 is Simplified to The product of the area of ​​each pole magnet slot 111 and the area of ​​the rotor punching 11 and the ratio of the outer diameter of the rotor punching 11 to the shortest distance from the center of the rotor punching 11 to each magnet slot 111 is By simplifying it, we get

[0041] It can be seen that by setting the above-mentioned relationship within the above-mentioned range, it is possible to ensure that the rotor punching sheet 11 has the characteristic of a large rotor outer diameter, thereby increasing the rotor's moment of inertia and improving the stability of the low-frequency operation of the motor 20. In addition, due to the large rotor outer diameter, in order to make it meet the above-mentioned range, the sum of the slot areas of the multiple magnet slots 111 needs to be reduced. Therefore, the stator and rotor punching sheets 10 of the present application also have the characteristic of a small sum of the slot areas of the magnet slots 111, thereby having the ability to maintain the maximum output torque under the condition of a small amount of magnetic parts, thereby meeting the working conditions within the industry.

[0042] In short, the stator and rotor punching 10 of the present application includes a rotor punching 11, on which magnet slots 111 are formed which are spaced apart in the circumferential direction and are used to accommodate magnetic parts. The sum of the slot areas of the plurality of magnet slots 111 is S1, the outer diameter of the rotor punching 11 is D1, the number of poles of the rotor punching 11 is P, and the shortest distance from the center of the rotor punching 11 to each magnet slot 111 is L1. The sum of the slot areas of the plurality of magnet slots 111, the outer diameter of the rotor punching 11, the number of poles of the rotor punching 11, and the shortest distance from the center of the rotor punching 11 to each magnet slot 111 satisfy: By setting the above relationship within the above range, it can be ensured that the stator and rotor punchings 10 can increase the rotor's rotational inertia, improve the stability of the low-frequency operation of the motor 20, and still maintain the maximum output torque under the condition of a small amount of magnetic parts, thereby greatly improving the output torque of the motor 20 and the noise generated by the operation of the motor 20 to meet the use requirements.

[0043] In some embodiments of the present application, the outer diameter D1 of the rotor punching 11 satisfies the following conditions: D1 ≥ 59 mm, the stator and rotor punchings 10 also include stator punchings 12, and the stator punchings 12 can be arranged on the outer periphery of the rotor punchings 11, wherein the outer diameter of the stator punchings 12 is D2, and the outer diameter D1 of the rotor punchings 11 and the outer diameter D2 of the stator punchings 12 satisfy the following conditions: D1 / D2 ≥ 0.59. By setting the outer diameter D1 of the rotor punchings 11 and the ratio of the outer diameter D1 of the rotor punchings 11 to the outer diameter D2 of the stator punchings 12 in the above ranges, the stator and rotor punchings 10 of the present application can adopt a larger outer diameter of the rotor punchings 11, that is, the outer diameter of the rotor. Under the condition of the same stack height of the rotor core, the same current can be passed through, and a larger output torque can be output, thereby improving the working efficiency of the motor 20. In addition, the use of a larger outer diameter of the rotor punchings 11 is also conducive to stable operation at a low frequency (10-30 rps).

[0044] In some embodiments of the present application, the number of poles P of the rotor punching 11 satisfies the following conditions: P≥10. By setting the number of poles of the rotor punching 11 within the above range, it can be ensured that the motor 20 of the present application will adopt a multi-pole pole-slot matching scheme to improve the order of the electromagnetic force, thereby reducing the force density in different frequency bands, thereby improving the noise vibration excited by the motor 20.

[0045] In some embodiments of the present application, the sum S1 of the slot areas of the plurality of magnet slots 111 satisfies the following condition: S1≤250mm 2 , wherein the sum of the slot areas of the multiple magnet slots 111 can be measured by using a three-coordinate measuring instrument, using a high-precision probe to refine the magnet slots 111 into multiple coordinate points, and then sequentially connecting and combining them into a surface, and then calculating the size of the slot areas of the multiple magnet slots 111 through software, or the sum of the slot areas of the magnet slots 111 can also be measured by a projection method, by using a top-down projection to depict the outer contour of the magnet slots 111 on the rotor core, and then calculating the slot area through software. By setting the sum of the slot areas of the multiple magnet slots 111 within the above range, the stator and rotor punchings 10 can adopt a multi-pole solution with a "V"-shaped magnetic circuit structure, improve the utilization rate of the magnets, ensure the maximum output torque, and meet the operating range requirements of the compressor industry.

[0046] like Figure 3 The figure shows the relationship between the outer diameter of the rotor sheet 11 and the sum of the slot areas of the plurality of magnet slots 111. In the figure, the rotor outer diameter is the outer diameter of the rotor sheet 11, and the rotor magnet total slot area is the sum of the slot areas of the plurality of magnet slots 111. Further, according to the above conditions: Under the condition that the maximum outer diameter of the motor 20 remains unchanged, the outer diameter D1 of the rotor core is increased. In order to keep the overall back electromotive force of the motor 20 equal, the sum of the slot areas of the multiple magnet slots 111 needs to increase with the increase of the outer diameter of the rotor core. However, too large an outer diameter of the rotor core will lead to serious stator temperature rise, worsening torque pulsation and other problems. Therefore, limiting the sum of the slot areas of the multiple magnet slots 111 within the above range can reasonably constrain the relationship between the outer diameter of the rotor core, the slot areas of the multiple magnet slots 111 and the number of poles.

[0047] like Figure 4 The figure shows the relationship between the outer diameter of the rotor punching 11 and the maximum output torque. With the same magnetic parts, the maximum output torque of the motor 20 decreases as the outer diameter decreases. When the maximum output torque of the motor 20 is lower than a certain value, it cannot meet the requirements of the operating range in the compressor industry. However, as the outer diameter of the rotor increases, the maximum output torque of the motor 20 does not change linearly. Therefore, the outer diameter D1 of the rotor punching 11 satisfies the following conditions: D1 ≥ 59 mm, and D1 / D2≥0.59 can ensure that the stator and rotor punchings 10 of the present application can adopt the outer diameter of the appropriate rotor punchings 11, thereby ensuring the optimal cost performance of the rotor.

[0048] The motor 20 according to the embodiment of the present application is briefly described below.

[0049] The motor 20 according to the embodiment of the present application is provided with a rotor and a stator, and the rotor and the stator are formed by stacking the stator and rotor punching sheets 10 of the above-mentioned embodiment. Therefore, the rotor of the motor 20 is formed by stacking the above-mentioned multiple rotor punching sheets 11, the sum of the slot areas of the multiple magnet slots 111 is S1, the outer diameter of the rotor punching sheet 11 is D1, the number of poles of the rotor punching sheet 11 is P, and the shortest distance from the center of the rotor punching sheet 11 to each magnet slot 111 is L1. The sum of the slot areas of the multiple magnet slots 111, the outer diameter of the rotor punching sheet 11, the number of poles of the rotor punching sheet 11, and the shortest distance from the center of the rotor punching sheet 11 to each magnet slot 111 satisfy: Therefore, the motor 20 increases the rotor moment of inertia by setting the above relationship within the above range, improves the stability of the low-frequency operation of the motor 20, and still maintains the maximum output torque under the condition of a small amount of magnetic parts, thereby greatly improving the output torque of the motor 20 and the noise generated by the operation of the motor 20 to meet the use requirements.

[0050] In some embodiments of the present application, the number of slots of the stator is Q, the number of phases of the motor 20 is m, and the number of slots of the stator, the number of phases of the motor 20, and the number of poles of the rotor punching 11 satisfy the following conditions: In a specific embodiment, the number of slots of the stator satisfies: Q=15, and the number of poles of the rotor punching 11 satisfies: P=10, as shown in the following figure and Figure 5 Shown are a comparison table of the number of poles of the rotor punching 11 and the electromagnetic force density performance and a comparison diagram of the number of poles of the rotor punching 11 and the electromagnetic force density performance, respectively. The diagram includes the electromagnetic force density performance when the number of stator slots Q=9 and the number of poles of the rotor punching 11 are P=6, Q=12 and P=8, and Q=15 and P=10. It can be seen that the electromagnetic force density performance of the motor 20 is different under different numbers of stator slots, numbers of phases of the motor 20 and numbers of poles of the rotor punching 11. The present application can ensure optimal performance by setting the number of stator slots, the number of phases of the motor 20 and the number of poles of the rotor punching 11 within the above range.

[0051]

[0052] The compressor 30 according to the embodiment of the present application is briefly described below.

[0053] like Figure 6As shown, the compressor 30 according to the embodiment of the present application is provided with the motor 20, the shell 32, the base 33 and the pump body 31 of the above-mentioned embodiment. Since the compressor 30 according to the embodiment of the present application is provided with the motor 20 of the above-mentioned embodiment, the motor 20 inside the compressor 30 can increase the rotational inertia of the rotor, improve the stability of the low-frequency operation of the motor 20, and still maintain the maximum output torque under the condition of a small amount of magnetic parts, thereby greatly improving the output torque of the motor 20 and the noise generated by the operation of the motor 20, meeting the use requirements.

[0054] The air conditioner 40 according to the embodiment of the present application is briefly described below.

[0055] like Figure 7 As shown, the air conditioner 40 according to the embodiment of the present application is provided with the compressor 30 of the above-mentioned embodiment. Since the air conditioner 40 according to the embodiment of the present application is provided with the compressor 30 of the above-mentioned embodiment, the compressor 30 of the air conditioner 40 has a motor 20. The motor 20 can increase the rotational inertia of the rotor, improve the stability of the low-frequency operation of the motor 20, and still maintain the maximum output torque under the condition of a small amount of magnetic parts, thereby greatly improving the output torque of the motor 20 and the noise generated by the operation of the motor 20 to meet the use requirements.

[0056] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0057] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0058] In the description of the present application, “plurality” means two or more.

[0059] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0060] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0062] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A stator and rotor punching sheet, characterized in that: include: A rotor punching sheet, wherein a plurality of magnet slots suitable for accommodating magnetic parts are formed on the rotor punching sheet, and the plurality of magnet slots are arranged at intervals in the circumferential direction of the rotor punching sheet; wherein, The sum of the slot areas of the plurality of magnet slots is S1, the outer diameter of the rotor punching is D1, the number of poles of the rotor punching is P, the shortest distance from the center of the rotor punching to each magnet slot is L1, and the following conditions are satisfied: 0.004≤ 2. The stator and rotor punching sheet according to claim 1, characterized in that: The outer diameter of the rotor punching sheet satisfies: D1 ≥ 59 mm.

3. The stator and rotor punching sheet according to claim 2, characterized in that: The number of poles of the rotor punching sheet satisfies: P≥10.

4. The stator and rotor punching sheet according to claim 3, characterized in that: The sum of the slot areas of the plurality of magnet slots satisfies: S1≤250mm 2 .

5. The stator and rotor punching sheet according to claim 2, characterized in that: Also includes: The stator punching sheet is arranged on the outer periphery of the rotor punching sheet, the outer diameter of the stator punching sheet is D2, and satisfies:

6. A motor, characterized in that: include: A rotor and a stator, wherein the rotor and the stator are formed by stacking the stator and rotor punching sheets described in any one of claims 1 to 5.

7. The motor according to claim 6, characterized in that The number of slots of the stator is Q, the number of phases of the motor is m, and the following conditions are satisfied:

8. The motor according to claim 7, characterized in that The number of slots of the stator satisfies: Q=15, and the number of poles of the rotor punching sheet satisfies: P=10.

9. A compressor, characterized in that: Comprising the motor as claimed in any one of claims 6-8.

10. An air conditioner, characterized in that: Comprising the compressor of claim 9.

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