Motor, compressor and refrigeration equipment

Abstract

The invention discloses a motor, a compressor and refrigeration equipment, the motor comprises a stator core and a winding, the stator core is provided with a stator slot, the stator core comprises a plurality of stator teeth and a plurality of stator yokes, the winding is wound on the stator core, and the winding is partially located in the stator slot; the rotor comprises a rotor iron core and permanent magnets, magnet grooves are formed in the rotor iron core, and the permanent magnets are located in the magnet grooves. According to the technical scheme, by reasonably setting the sizes of the stator and the rotor in the motor, the distribution of materials of the motor is more reasonable, so that the efficiency of the motor can be improved, the refrigeration efficiency of the compressor is improved, the cost of the compressor is reduced, and the reliability of the motor is improved.

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 almost reached its limit, and it is difficult to further improve the efficiency of the motor or the cooling efficiency of the compressor. The size parameters of the motor stator and rotor determine the performance of the motor. Therefore, by reasonably designing the stator and rotor size relationship, the efficiency of the motor can be improved while ensuring the reliability of the motor and reducing the cost. 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 object, the motor provided by the present invention comprises:

[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 part is located in the stator slots;

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

[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 width b of the magnet slot, 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 integrally formed.

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

[0015] The present invention also proposes 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 on the stator core, and the winding part 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 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 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.

[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 part 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 of permanent magnets N 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 the rotor in the motor, thereby improving 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. 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 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 It is a schematic structural diagram of the motor of the present invention from a cross-sectional perspective;

[0020] Figure 2 Schematic diagram of the structure of a motor in another embodiment from a cross-sectional perspective (with D1, D2, h, L, b marked).

[0021] Description of Figure Numbers:

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

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

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are 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 components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication 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 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 defined as "first" and "second" may explicitly or implicitly include at least one of the 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 that satisfies 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 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 almost reached its limit, and it is difficult to further improve the efficiency of the motor or the cooling efficiency of the compressor. The size parameters of the motor stator and rotor determine the performance of the motor. Therefore, by reasonably designing the stator and rotor size relationship, the efficiency of the motor can be improved while ensuring the reliability of the motor and reducing the cost.

[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 a portion of the winding 120 is 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, and 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; 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. The motor in this embodiment is configured as an inner rotor 200 motor. The stator 100 and the rotor 200 in the motor are also conventional structures in the motor. The stator 100 includes a stator core 110 and a winding 120. The stator core 110 is provided with a stator slot 111. The winding 120 is wound on the surface of the stator core 110, and part of the winding 120 is located in the stator slot 111. The stator core 110 includes a plurality of stator teeth 112 and a plurality of stator yokes 113, wherein the stator teeth 112 are spaced apart on the stator yoke 113, and the stator teeth 112 are protrudingly arranged compared to the stator yoke 113, and the stator teeth 112 are closer to the rotor 200 than the stator yoke 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, the width of the stator tooth 112 is set to L, and Q, D1 and L satisfy the range of 0.35≤Q×L / πD1≤0.55. Considering that the number of stator slots 111 in this embodiment is consistent with the number of stator teeth 112, 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 the range of 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 the efficiency of the motor will be reduced.

[0032] In addition, the rotor 200 includes a rotor core 210 and a permanent magnet, the rotor core 210 is sleeved in the stator core 110 and is rotatable relative to the stator core 110, and the rotor core 210 and the stator core 110 can be of different materials or shapes, so as to meet the requirements of different processing technologies of the stator 100 and the rotor 200, which 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 the good performance of the electrode, and also improving the wide application range of the motor. Wherein a magnet slot 211 is provided on the rotor core 210, and a plurality of magnet slots 211 are spaced and distributed in the circumferential direction of the rotor 200. The permanent magnet is arranged in the magnet slot 211, so that a plurality of permanent magnets and a plurality of magnet slots 211 correspond one to one. Wherein, the permanent magnet can be partially located in the magnet slot 211, or can be completely located in the magnet slot 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 the present 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 is obvious from the table that in motor models with different speeds, the motor efficiency in this embodiment is better than 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 obtained 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 refrigeration 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 obtained that by reasonably setting the size of the motor, the compressor COP of many commonly used models is 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, thereby improving 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.

[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 the rotor 200 commonly used in households is generally 4 or 6; the model of the motor is closely related to the number of poles of the rotor 200. Generally, the more poles, the higher the model, the higher the efficiency of the motor, the more poles, the smaller the rotation diameter, the higher the frequency of the electromotive force magnetic field of each phase, the greater the electromotive force per cycle, the higher the no-load model of the motor, and under load, due to the allowable heat loss limiting the no-load model, the model under load will be reduced, limited by the allowable load conditions, and the power consumption will also be reduced accordingly. Therefore, in this embodiment, the efficiency of the motor is improved by setting the number of poles to 8 or 10, 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, and at the same time, the thickness of the permanent magnet will not be 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 range of the maximum inner diameter of the stator yoke 113, the anti-demagnetization capability of the motor can be increased, thereby reducing the production cost of the motor and improving the cost performance of the motor. At the same time, limiting the maximum inner diameter of the stator yoke 113 to a range of 50 to 130 can meet the requirements of the motor used in the compressor.

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

[0049] The number of stator slots 111 of the variable frequency motor for the current household air conditioner compressor is 6 or 9. First, the number of stator slots 111 determines the distribution mode of the stator 100 winding 120, which in turn affects the magnetic field distribution of the motor. More stator slots 111 can provide a more uniform magnetic field distribution, reduce the inhomogeneity of the magnetic field, and thus improve the efficiency and performance of the motor. Secondly, within a certain range, increasing the number of stator slots 111 can reduce the magnetic field saturation phenomenon. When current passes through the stator 100 winding 120, the magnetic field will cause the core to saturate, thereby reducing the efficiency and performance of the motor. Properly increasing the number of stator slots 111 can reduce the magnetic field saturation and improve the output power and efficiency of the motor. At the same time, fewer stator slots 111 may lead to the generation of harmonic magnetic fields, which will cause vibration and noise of the motor. Therefore, by increasing the number of stator slots 111, the generation of harmonic magnetic fields can be reduced, and the running stability and quietness of the motor can be improved. Therefore, in this embodiment, the stator slots 111 are set to 12, thereby increasing the various performances of the motor, reducing the generation of noise, and improving the cost performance of the motor.

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

[0051] It should be noted that, in the present embodiment, the stator yoke 113 is roughly annularly arranged, so that the stator yoke 113 has an inner periphery and an outer periphery, and the stator teeth 112 are arranged at intervals on the inner peripheral surface 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, and the integral structure process is simple, which can reduce the manufacturing difficulty of the stator core 110, thereby reducing the production cost of the motor; in addition, the stator core 110 is set as an integral 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 the present embodiment, a total of 12 stator teeth 112 are provided, and 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 a circular hole shape, and the mounting hole 220 may be provided with one or more mounting holes. In the present embodiment, a total of four mounting holes 220 are arranged at intervals, and of course two mounting holes 220 may also be provided, and three mounting holes 220 may also be provided, and more mounting holes 220 may also be provided, 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 a circular hole shape, and the flow hole 230 is used to circulate the 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 the 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 embodiment. Since the refrigeration device 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 repeated here one by one.

[0056] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A motor, characterized in that: include: 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 part is located in the stator slots; The rotor comprises a rotor core and a permanent magnet, wherein the rotor core is provided with a magnet slot, and the permanent magnet is located in the magnet slot; 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 width b of the magnet slot, 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, characterized in that 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, characterized in that The number of permanent magnets N=2p; or the number of permanent magnets N=4p.

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

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

6. The motor according to claim 1, characterized in that The number of stator slots is Q=12.

7. The motor according to claim 1, characterized in that 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 integrally formed.

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

9. A compressor, characterized in that: Comprising a motor as claimed in any one of claims 1 to 8.

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

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