Motors, compressors and refrigeration equipment

Abstract

The present invention discloses a motor, a compressor, and a refrigeration device. The motor includes a stator core and a winding. The stator core is provided with stator slots, the stator core includes a plurality of stator teeth and a plurality of stator yokes, and the winding is wound around the stator core, with the winding portion located within the stator slots. The rotor includes a rotor core and a permanent magnet. The rotor core is provided with magnet slots, and the permanent magnets are located in the magnet slots. The technical solution of the present invention adopts a more reasonable allocation of materials in the motor by rationally setting the dimensions of the stator and rotor in the motor. This improves the efficiency of the motor, thereby improving the refrigeration efficiency of the compressor, reducing the cost of the compressor, and improving the reliability of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a motor, a compressor and a refrigeration device. Background Art

[0002] The efficiency of current compressor motors has reached its limit, making further improvements to either the motor's efficiency or the compressor's cooling efficiency difficult. The stator and rotor dimensions of a motor determine its performance. Therefore, by properly designing the stator-rotor size relationship, it's possible to improve motor efficiency while ensuring reliability and reducing costs. Summary of the Invention

[0003] The main purpose of the present invention is to provide a motor, aiming to improve the efficiency of the motor and the refrigeration efficiency of the compressor.

[0004] To achieve the above-mentioned object, the motor proposed in the present invention includes:

[0005] The stator comprises a stator core and a winding, wherein the stator core is provided with stator slots, the stator core comprises a plurality of stator teeth and a plurality of stator yokes, the winding is wound around the stator core, and the winding portion is located in the stator slots;

[0006] The rotor comprises a rotor core and permanent magnets, wherein the rotor core is provided with magnet slots, and the permanent magnets are located in the magnet slots;

[0007] Among them, the relationship between the number Q of the stator slots, the inner diameter D1 of the stator core, and the width L of the stator teeth satisfies 0.35≤Q×L / πD1≤0.55; the relationship between the maximum inner diameter D2 of the stator yoke and the inner diameter D1 of the stator core satisfies 1.0≤D2 / D1≤1.7; the relationship between the magnet slot width b, the thickness h of the magnet slot, the number of poles 2p of the rotor, and the number of permanent magnets N satisfies 1.7≤b×h×2p×N / 1000≤3.0.

[0008] In one embodiment, the number of poles of the rotor is 2p=8; or the number of poles of the rotor is 2p=10.

[0009] In one embodiment, the number of permanent magnets N=2p; or the number of permanent magnets N=4p.

[0010] In one embodiment, the thickness of the magnet slot satisfies 1.2 mm ≤ h ≤ 2.5 mm.

[0011] In one embodiment, the maximum inner diameter D2 of the stator yoke satisfies 50 mm ≤ D2 ≤ 130 mm.

[0012] In one embodiment, the number of the stator slots Q=12.

[0013] In one embodiment, the stator yoke is arranged in a ring shape, the stator teeth are arranged at intervals on the inner circumference of the stator yoke, and the stator yoke and the stator teeth are formed as one piece.

[0014] In one embodiment, a mounting hole and a flow hole are provided on the rotor.

[0015] The present invention also proposes a compressor, which includes a motor, the motor includes a stator and a rotor, the stator includes a stator core and a winding, the stator core is provided with stator slots, the stator core includes multiple stator teeth and multiple stator yokes, the winding is wound around the stator core, and the winding portion is located in the stator slots; the rotor includes a rotor core and permanent magnets, the rotor core is provided with magnet slots, and the permanent magnets are located in the magnet slots; wherein the relationship between the number of stator slots Q, the inner diameter D1 of the stator core, and the width L of the stator teeth satisfies 0.35≤Q×L / πD1≤0.55; the relationship between the maximum inner diameter D2 of the stator yoke and the inner diameter D1 of the stator core satisfies 1.0≤D2 / D1≤1.7; the relationship between the magnet slot width b, the magnet slot thickness h, the number of rotor poles 2p, and the number of permanent magnets N satisfies 1.7≤b×h×2p×N / 1000≤3.0.

[0016] The present invention also proposes a refrigeration device, the refrigeration device includes a compressor, the compressor includes a motor, the motor includes a stator and a rotor, the stator includes a stator core and a winding, the stator core is provided with a stator slot, the stator core includes a plurality of stator teeth and a plurality of stator yokes, the winding is wound around the stator core, and the winding portion is located in the stator slot; the rotor includes a rotor core and a permanent magnet, the rotor core is provided with a magnet slot, and the permanent magnet is located in the magnet slot; wherein, The relationship between the number Q of stator slots, the inner diameter D1 of the stator core, and the width L of the stator teeth satisfies 0.35≤Q×L / πD1≤0.55; the relationship between the maximum inner diameter D2 of the stator yoke and the inner diameter D1 of the stator core satisfies 1.0≤D2 / D1≤1.7; the relationship between the width b of the magnet slot, the thickness h of the magnet slot, the number of rotor poles 2p, and the number N of permanent magnets satisfies 1.7≤b×h×2p×N / 1000≤3.0.

[0017] The technical solution of the present invention makes the material distribution of the motor more reasonable by reasonably setting the sizes of the stator and rotor in the motor. In this way, the efficiency of the motor can be improved, and the cooling efficiency of the compressor can be improved, the cost of the compressor can be reduced, and the reliability of the motor can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0019] Figure 1 Schematic diagram of the structure of the motor of the present invention from a cross-sectional perspective;

[0020] Figure 2 2 is a schematic structural diagram of a motor in a cross-sectional view according to another embodiment (with references D1, D2, h, L, and b).

[0021] Description of Figure Numbers:

[0022] Label name Label name 100 stator 200 rotor 110 stator core 111 stator slots 112 stator teeth 113 stator yoke 120 Winding 210 rotor core 211 Magnet slot 220 Mounting holes 230 Through-hole

[0023] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0026] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. 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 mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0027] The efficiency of current compressor motors has reached its limit, making further improvements to either the motor's efficiency or the compressor's cooling efficiency difficult. The stator and rotor dimensions of a motor determine its performance. Therefore, by properly designing the stator-rotor size relationship, it's possible to improve motor efficiency while ensuring reliability and reducing costs.

[0028] In view of this, the present invention provides a motor.

[0029] In the embodiment of the present invention, Figure 1 and Figure 2 As shown, the motor includes a stator 100 and a rotor 200. The stator 100 includes a stator core 110 and a winding 120. The stator core 110 is provided with a stator slot 111. The stator core 110 includes a plurality of stator teeth 112 and a plurality of stator yokes 113. The winding 120 is wound around the stator core 110, and the winding 120 is partially located in the stator slot 111. The rotor 200 includes a rotor core 210 and a permanent magnet. The rotor core 210 is provided with a magnet slot 211. The permanent magnet is located in the magnet slot 211. The relationship between the number Q of the slots 111, the inner diameter D1 of the stator core 110, and the width L of the stator teeth 112 satisfies 0.35≤Q×L / πD1≤0.55; the relationship between the maximum inner diameter D2 of the stator yoke 113 and the inner diameter D1 of the stator core 110 satisfies 1.0≤D2 / D1≤1.7; and the relationship between the width b of the magnet slot 211, the thickness h of the magnet slot 211, the number 2p of poles of the rotor 200, and the number N of permanent magnets satisfies 1.7≤b×h×2p×N / 1000≤3.0.

[0030] The motor in the technical solution of the present invention is a conventional motor. In this embodiment, the motor is configured as an inner rotor 200 motor. The stator 100 and rotor 200 in the motor also have conventional motor structures. The stator 100 includes a stator core 110 and windings 120. The stator core 110 is provided with stator slots 111. The windings 120 are wound around the surface of the stator core 110, with some windings 120 located within the stator slots 111. The stator core 110 includes a plurality of stator teeth 112 and a plurality of stator yokes 113. The stator teeth 112 are spaced apart on the stator yokes 113 and protrude from the stator yokes 113. The stator teeth 112 are closer to the rotor 200 than the stator yokes 113. The number of stator teeth 112 can be 8, 10, or 12. In this embodiment, the number of stator teeth 112 is not specifically limited.

[0031] Furthermore, the number of stator slots 111 is set to Q, the inner diameter of the stator tooth 112 is set to D1, and the width of the stator tooth 112 is set to L. Q, D1, and L satisfy the range of 0.35≤Q×L / πD1≤0.55. Considering that the number of stator slots 111 and the number of stator teeth 112 in this embodiment are the same, Q×L is the sum of the widths of the multiple stator teeth 112, πD1 is the area of ​​the circle enclosed by the ends of the multiple stator teeth 112, and Q×L / πD1 is the ratio of the sum of the widths of the multiple stator teeth 112 to the area of ​​the circle enclosed by the ends of the multiple stator teeth 112. Limiting this ratio range to 0.35 to 0.55 can effectively improve the efficiency of the motor. If it is less than 0.35 or greater than 0.55, the efficiency of the motor will not be significantly improved or may be reduced.

[0032] In addition, the rotor 200 includes a rotor core 210 and permanent magnets. The rotor core 210 is sleeved in the stator core 110 and is rotatable relative to the stator core 110. The rotor core 210 and the stator core 110 can be made of different materials or shapes, thereby meeting the requirements of different processing technologies of the stator 100 and the rotor 200. This is conducive to selecting suitable punching sheets to form the rotor core 210 and the stator core 110 according to the performance requirements of the motor, thereby ensuring good performance of the electrodes and also improving the wide range of applications of the motor. Magnet slots 211 are provided on the rotor core 210, and multiple magnet slots 211 are spaced apart in the circumferential direction of the rotor 200. Permanent magnets are arranged in the magnet slots 211 so that multiple permanent magnets correspond to multiple magnet slots 211 one by one. The permanent magnets can be partially located in the magnet slots 211 or completely located in the magnet slots 211, which is not specifically limited here.

[0033] It should be noted that the inner wall surface of the stator yoke 113 is arranged in an arc shape. Therefore, the inner wall surface of the stator yoke 113 has a point with the largest inner diameter. At this time, the stator yoke 113 has a maximum inner diameter D2, and the inner diameter D1 of the stator core 110 is the inner diameter of the stator tooth 112. In view of this, the maximum inner diameter D2 of the stator yoke 113 is at least larger than the inner diameter D1 of the stator core 110, and in this embodiment, the relationship between the maximum inner diameter D2 of the stator yoke 113 and the inner diameter D1 of the stator core 110 satisfies 1.0≤D2 / D1≤1.7. Within this ratio range, the efficiency of the motor can be effectively improved.

[0034] Furthermore, the magnet slot 211 has a width b, and the magnet slot 211 has a thickness h. The number of poles of the rotor 200 is set to 2p, and the number of permanent magnets is set to N. The above dimensions are reasonably set to satisfy 1.7≤b×h×2p×N / 1000≤3.0, which can reduce the energy consumption of the motor and further improve the motor efficiency.

[0035] Please refer to the following table. It can be seen from the table that in motor models with different speeds, the motor efficiency in this embodiment is better than that of the prior art. Among them, when the model is 30rps, the motor efficiency of the prior art is 91.6%, while the motor efficiency of this embodiment is 91.9%, which is 0.3% higher than the motor efficiency of the prior art. When the model is 60rps, the motor efficiency of the prior art is 93.1%, while the motor efficiency of this embodiment is 93.3%, which is 0.2% higher than the motor efficiency of the prior art. When the model is 90rps, the motor efficiency of the prior art is 93.0%, and the motor efficiency of the prior art is 93.2%, which is 0.2% higher than the motor efficiency of the prior art. It can be seen that by reasonably setting the size of the motor, the motor efficiency of many commonly used models is significantly improved.

[0036] In addition, please continue to refer to the following table. Among the motor models of different models, the compressor COP of this embodiment has also been significantly improved. Compressor COP represents the refrigeration performance coefficient of the compressor, which refers to the ratio of the cooling capacity of the refrigeration compressor under a certain working condition to the shaft power Pe of the refrigeration compressor under the same working condition. Among them, when the model is 30rps, the compressor COP of the prior art is 595, while the compressor COP of this embodiment is 609, which is 14 higher than the compressor COP of the prior art. When the model is 60rps, the compressor COP of the prior art is 378, and the compressor COP of this embodiment is 382, ​​which is 4 higher than the compressor COP of the prior art. When the model is 90rps, the compressor COP of the prior art is 250, and the compressor COP of this embodiment is 251, which is 1 higher than the compressor COP of the prior art. It can be seen that by reasonably setting the size of the motor, the compressor COP of many commonly used models has been significantly improved.

[0037] Continuing to refer to the table below, it can be seen that this embodiment greatly reduces the cost of the motor by reasonably setting the size and material of the motor, and further improves the reliability of the motor by improving its temperature rise.

[0038]

[0039] The technical solution of the present invention makes the material distribution of the motor more reasonable by reasonably setting the sizes of the stator 100 and the rotor 200 in the motor. In this way, the efficiency of the motor can be improved, and the cooling efficiency of the compressor can be improved, the cost of the compressor can be reduced, and the reliability of the motor can be improved.

[0040] In one embodiment, see Figure 1 , the number of poles of the rotor 200 is 2p=8; or the number of poles of the rotor 200 is 2p=10.

[0041] The number of poles of rotor 200 commonly used in current households is generally 4 or 6. The motor model and the number of poles of rotor 200 are closely related. Generally speaking, the more poles there are, the higher the model, and the higher the motor efficiency. The more poles there are, the smaller the rotor diameter, the higher the frequency of the electromotive force magnetic field per phase, the greater the electromotive force per cycle, and the higher the no-load model of the motor. Under load, the no-load model is limited by the allowable heat loss, so the model under load will be reduced, limited by the allowable load conditions, and the power consumption will also be reduced. Therefore, in this embodiment, by setting the number of poles to 8 or 10, the motor efficiency is improved and the power consumption of the motor is reduced.

[0042] In one embodiment, see Figure 1 , the number of permanent magnets N = 2p; or the number of permanent magnets N = 4p.

[0043] It should be noted that the number of poles of the rotor 200 refers to the number of magnetic poles on the motor rotor 200. The number of magnetic poles of the motor determines the performance and characteristics of the motor. The more poles the rotor 200 has, the greater the torque of the motor will be, but the model will be reduced. Conversely, the fewer poles the rotor 200 has, the faster the motor will be, but the torque will be reduced. Therefore, by setting the number of poles of the rotor 200 to 2p and 4p, both the torque requirements of the compressor and the model requirements of the compressor can be met, thereby improving the cost performance of the motor.

[0044] In one embodiment, see Figure 1 and Figure 2 , the thickness of the magnet slot 211 satisfies 1.2mm≤h≤2.5mm.

[0045] Specifically, according to the above embodiment, the permanent magnet is located in the magnet slot 211, so that the magnet slot 211 is adapted to the permanent magnet in the thickness direction. Therefore, when h≤1.2mm, that is, the thickness of the permanent magnet is small, the magnetic flux density will be small, and the output power of the motor will be small, thereby reducing the efficiency of the motor; when x≥2.5mm, that is, the thickness of the permanent magnet is large, magnetic circuit saturation will occur, resulting in increased magnetic circuit loss, thereby reducing the efficiency of the motor; therefore, by controlling the thickness of the magnet slot 211 and the permanent magnet to between 1.2mm and 2.5mm, the output power of the motor can meet the requirements of the compressor, while not making the thickness of the permanent magnet too large, thereby reducing the magnetic circuit loss and improving the efficiency of the motor.

[0046] In one embodiment, see Figure 1 and Figure 2 , the maximum inner diameter D2 of the stator yoke 113 satisfies 50mm≤D2≤130mm.

[0047] By limiting the maximum inner diameter of the stator yoke 113 to a certain range, the motor's anti-demagnetization capability can be increased, thereby reducing the motor's manufacturing cost and improving its cost-effectiveness. Furthermore, limiting the maximum inner diameter of the stator yoke 113 to a range of 50 to 130 mm can meet the requirements of motors used in compressors.

[0048] In one embodiment, see Figure 1 and Figure 2 , the number of the stator slots 111 is Q=12.

[0049] Currently, the number of stator slots 111 in variable-frequency motors used in household air-conditioning compressors is 6 or 9. First, the number of stator slots 111 determines the distribution of the stator windings 120, which in turn affects the motor's magnetic field distribution. A larger number of stator slots 111 can provide a more uniform magnetic field distribution, reducing magnetic field inhomogeneity, thereby improving the motor's efficiency and performance. Second, within a certain range, increasing the number of stator slots 111 can reduce magnetic field saturation. When current passes through the stator windings 120, the magnetic field can cause the iron core to saturate, thereby reducing the motor's efficiency and performance. Properly increasing the number of stator slots 111 can reduce magnetic field saturation and improve the motor's output power and efficiency. Furthermore, a smaller number of stator slots 111 can lead to the generation of harmonic magnetic fields, which can cause motor vibration and noise. Therefore, increasing the number of stator slots 111 can reduce harmonic magnetic fields and improve the motor's operating smoothness and quietness. Therefore, in this embodiment, the number of stator slots 111 is set to 12, thereby improving the motor's various performance characteristics, reducing noise generation, and improving the motor's cost-effectiveness.

[0050] In one embodiment, see Figure 1 and Figure 2The stator yoke 113 is arranged in a ring shape, and the stator teeth 112 are arranged at intervals on the inner circumference of the stator yoke 113. The stator yoke 113 and the stator teeth 112 are formed as one piece.

[0051] It should be noted that in this embodiment, the stator yoke 113 is arranged in a roughly annular shape. In this way, the stator yoke 113 has an inner circumference and an outer circumference, and the stator teeth 112 are arranged at intervals on the inner circumference of the stator yoke 113, and the distance between any two stator teeth 112 is equal. The stator yoke 113 and the stator teeth 112 are integrally formed in a mold. The integrated structure has a simple process, which can reduce the manufacturing difficulty of the stator core 110 and thus reduce the production cost of the motor. In addition, the stator core 110 is set as an integrated structure, which can improve the mechanical properties of the stator core 110, thereby improving the stability of the motor during operation and the service life of the motor. In this embodiment, a total of 12 stator teeth 112 are provided. Of course, the number of stator teeth 112 can also be less than 12 or greater than 12.

[0052] In one embodiment, see Figure 1 and Figure 2 The rotor 200 is provided with a mounting hole 220 and a flow hole 230 .

[0053] Specifically, the rotor 200 is provided with a mounting hole 220 and a flow hole 230 for mounting with other components. The mounting hole 220 is arranged in the shape of a circular hole, and there can be one mounting hole 220 or a plurality of mounting holes 220. In the present embodiment, there are four spaced-apart mounting holes 220. Of course, there can also be two mounting holes 220, three mounting holes 220, or more mounting holes 220, which are not specifically limited here. Among them, the mounting hole 220 is installed by inserting a rivet, and of course it can also be installed by inserting a screw, which is not specifically limited here. The flow hole 230 is also arranged in the shape of a circular hole, and the flow hole 230 is used to circulate refrigerant. When the refrigerant passes through the flow hole 230, it can have the effect of reducing the temperature of the motor.

[0054] The present invention also proposes a compressor, which includes a motor. The specific structure of the motor refers to the above-mentioned embodiment. Since this compressor adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0055] The present invention also proposes a refrigeration device, which includes a compressor. The specific structure of the compressor refers to the above-mentioned embodiment. Since this refrigeration device adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0056] The above descriptions are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present description and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A motor, characterized in that: include: A stator, comprising a stator core and windings, wherein the stator core is provided with stator slots, the stator core comprising a plurality of stator teeth and a plurality of stator yokes, the windings being wound around the stator core, and the windings being partially located in the stator slots; The rotor comprises a rotor core and permanent magnets, wherein the rotor core is provided with magnet slots, and the permanent magnets are located in the magnet slots; Among them, the relationship between the number Q of the stator slots, the inner diameter D1 of the stator core, and the width L of the stator teeth satisfies 0.35≤Q×L / πD1≤0.55; the relationship between the maximum inner diameter D2 of the stator yoke and the inner diameter D1 of the stator core satisfies 1.0≤D2 / D1≤1.7; the relationship between the magnet slot width b, the thickness h of the magnet slot, the number of poles 2p of the rotor, and the number of permanent magnets N satisfies 1.7≤b×h×2p×N / 1000≤3.

0.

2. The motor according to claim 1, wherein The number of poles of the rotor is 2p=8; or the number of poles of the rotor is 2p=10.

3. The motor according to claim 1, wherein The number of permanent magnets N=2p; or the number of permanent magnets N=4p.

4. The motor according to claim 1, wherein The thickness of the magnet slot satisfies 1.2 mm ≤ h ≤ 2.5 mm.

5. The motor according to claim 1, wherein The maximum inner diameter D2 of the stator yoke satisfies 50 mm ≤ D2 ≤ 130 mm.

6. The motor according to claim 1, wherein The number of stator slots Q=12.

7. The motor according to claim 1, wherein The stator yoke is arranged in a ring shape, the stator teeth are arranged at intervals on the inner circumference of the stator yoke, and the stator yoke and the stator teeth are formed as one piece.

8. The motor according to claim 1, wherein The rotor is provided with a mounting hole and a flow hole.

9. A compressor, characterized in that: The motor comprises the motor according to any one of claims 1 to 8.

10. A refrigeration device, characterized in that: Comprising the motor as claimed in claim 9.

Images