Motor, compressor and air conditioner

Abstract

The invention discloses a motor, a compressor and an air conditioner, the motor comprises a stator and a rotor, the stator is provided with a central shaft hole, the rotor is rotatably arranged in the central shaft hole, the axis of the rotor and the axis of the stator are coaxial, and the outer diameter D1 of the stator and the outer diameter D2 of the rotor meet the relation: 0.51 < = D2 / D1 < = 0.55. The outer diameter D1 of the stator and the outer diameter D2 of the rotor are set to meet the condition that D2 / D1 is larger than or equal to 0.51 and smaller than or equal to 0.55, overall optimization is conducted on the size proportion of the motor, the split ratio of the motor is increased on the basis that miniaturization of the motor is guaranteed, the outer diameter size of the rotor can be relatively increased by increasing the split ratio of the motor, and therefore the arrangement space of magnets can be increased, and the size of the motor is reduced. A proper magnetic load can be obtained; and secondly, the outer diameter of the rotor is relatively increased, so that the rotational inertia of the rotor is also increased, the power density of the motor can be improved, and the efficiency of the motor is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to motors, compressors and air conditioners. Background Art

[0002] In order to promote carbon neutrality, the refrigeration equipment industry has put forward higher requirements for the energy efficiency level of equipment. The energy efficiency of refrigeration equipment can be effectively improved by rationally optimizing the structure of various electrical components and parts of refrigeration equipment. Among them, the motor is one of the important components of the air-conditioning compressor. The efficiency of the motor directly affects the efficiency of the air-conditioning compressor. When designing the motor, the size of each component of the motor is optimized according to the actual operating conditions. Adjusting the size of each component of the motor to the optimal range can maximize the efficiency of the motor, thereby maximizing the energy efficiency of the compressor. If the size settings of the various components of the motor are unreasonable, for example, the ratio of the stator outer diameter to the rotor outer diameter, the yoke ratio and other unreasonable designs will directly lead to a decrease in the efficiency of the motor.

[0003] Although the size design of various motor components in the prior art can improve the efficiency of the motor, there is still a problem of low efficiency of the motor caused by unreasonable design. Summary of the invention

[0004] The purpose of the present invention is to provide a motor, a compressor and an air conditioner to solve the problem that although the size design of the motor components in the prior art can improve the efficiency of the motor, there is still a problem of low efficiency of the motor caused by unreasonable design.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The motor comprises a stator and a rotor, wherein the stator is provided with a central shaft hole, the rotor is rotatably arranged in the central shaft hole, the axis of the rotor is coaxial with the axis of the stator, and the outer diameter D1 of the stator and the outer diameter D2 of the rotor satisfy the relationship: 0.51≤D2 / D1≤0.55.

[0007] As a preferred solution of the above-mentioned motor, the stator includes a yoke and a plurality of teeth, the plurality of teeth are evenly spaced along the circumference of the stator, and the tooth width C of the teeth and the thickness E of the yoke satisfy the relationship: C / E=1.21~1.32.

[0008] As a preferred solution of the above motor, a stator slot is formed between any two adjacent teeth, and the winding coil is wound around the teeth and distributed in the stator slot;

[0009] The outer diameter D1 of the stator, the effective end surface area S2 of a single stator slot, and the number Z of the stator slots satisfy the relationship: D1 / (S2*Z)=0.04-0.065;

[0010] The effective end surface area S2 of a single stator slot is a partial area for accommodating the winding coil.

[0011] As a preferred solution for the above-mentioned motor, the rotor is provided with a plurality of magnet slots evenly spaced along the circumferential direction. Along the circumferential direction of the rotor, the magnet end area of ​​each pole is S1. The outer diameter D2 of the rotor, the magnet end area S1 of each pole and the number of poles P satisfy the relationship: D2 / (S1*P)=0.14~0.17.

[0012] As a preferred solution of the above motor, a plurality of third grooves are concavely formed on the outer peripheral wall of the rotor at intervals along the circumferential direction, and along the radial direction of the rotor, the depth h of the third grooves is in the range of 0.1mm≤h≤0.3mm.

[0013] As a preferred solution of the above motor, when the magnet slot is in a straight line shape, along the radial direction of the rotor, the distance between the central axis of the rotor and the outer side wall of the magnet slot is a1;

[0014] The distance a1 between the central axis of the rotor and the outer wall of the magnet groove, the outer diameter D2 of the rotor, the depth h of the third groove and the number of poles P satisfy the relationship: a1 = [(D2) / 2-h]*cos(180° / P).

[0015] As a preferred solution of the above motor, when the magnet groove is V-shaped, along the radial direction of the rotor, the minimum distance between the central axis of the rotor and the outer side wall of the magnet groove is a2;

[0016] The minimum distance a2 between the central axis of the rotor and the outer side wall of the magnet slot, the outer diameter D2 of the rotor and the number of poles P satisfy the relationship: a2 = [(D2) / 2]*cos(180° / P)-[(D2) / 4]*sin(180° / P) / tanx;

[0017] Among them, the range of x is: 50°~65°.

[0018] As a preferred solution of the above motor, the number of poles P=2n, where n is a positive integer greater than or equal to 2.

[0019] A compressor comprises the above-mentioned motor.

[0020] An air conditioner comprises the above-mentioned compressor.

[0021] Beneficial effects of the present invention:

[0022] The purpose of the present invention is to provide a motor, a compressor and an air conditioner, wherein the motor includes a stator and a rotor, the stator is provided with a central axis hole, the rotor is rotatably arranged in the central axis hole, the axis of the rotor is coaxial with the axis of the stator, and the outer diameter D1 of the stator and the outer diameter D2 of the rotor satisfy the relationship: 0.51≤D2 / D1≤0.55. By setting the outer diameter D1 of the stator and the outer diameter D2 of the rotor to satisfy 0.51≤D2 / D1≤0.55, the size ratio of the motor is optimized as a whole, and the split ratio of the motor is increased on the basis of ensuring the miniaturization of the motor. By increasing the split ratio of the motor, the outer diameter of the rotor can be relatively increased, so that the arrangement space of the magnet can be increased, and then a suitable magnetic load can be obtained; secondly, the outer diameter of the rotor is relatively increased, so that the moment of inertia of the rotor is also increased, so that the power density of the motor can be improved, and the efficiency of the motor can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a structural schematic diagram of a motor provided by a specific embodiment of the present invention;

[0024] Figure 2 yes Figure 1 Partial view at A;

[0025] Figure 3 is a broken line provided by a specific embodiment of the present invention Figure 1 ;

[0026] Figure 4 is a broken line provided by a specific embodiment of the present invention Figure 2 ;

[0027] Figure 5 is a broken line provided by a specific embodiment of the present invention Figure 3 ;

[0028] Figure 6 is a broken line provided by a specific embodiment of the present invention Figure 4 ;

[0029] Figure 7 is a broken line provided by a specific embodiment of the present invention Figure 5 ;

[0030] Figure 8 is a broken line provided by a specific embodiment of the present invention Figure 6 ;

[0031] Fig. 9 is a bar graph provided by a specific embodiment of the present invention;

[0032] Fig.10 is a broken line provided by a specific embodiment of the present invention Figure 7 ;

[0033] Fig.11is a broken line provided by a specific embodiment of the present invention Figure 8 .

[0034] In the figure:

[0035] 1. stator; 11. yoke; 111. first groove; 112. second groove; 12. tooth; 13. stator slot;

[0036] 2. rotor; 21. magnet groove; 22. third groove. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0038] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0041] As one of the important components of the air-conditioning compressor, the efficiency of the motor directly affects the efficiency of the air-conditioning compressor. When designing the motor, the size of each motor component is optimized according to the actual use conditions. By adjusting the size of each motor component to the optimal range, the efficiency of the motor can be maximized, thereby maximizing the energy efficiency of the compressor. If the size of each motor component is set unreasonably, for example, the ratio of the stator outer diameter to the rotor outer diameter, the yoke ratio and other unreasonable designs will directly lead to a decrease in the efficiency of the motor. Although the size design of each motor component in the current prior art can improve the efficiency of the motor, there is still a problem of low efficiency of the motor caused by unreasonable design.

[0042] Therefore, the present invention provides a motor, wherein, as Figure 1 As shown, the motor includes a stator 1 and a rotor 2. The stator 1 is provided with a central shaft hole. The rotor 2 is rotatably arranged in the central shaft hole. The axis of the rotor 2 is coaxial with the axis of the stator 1.

[0043] Among them, the outer diameter D1 of the stator 1 and the outer diameter D2 of the rotor 2 satisfy the relationship: 0.51≤D2 / D1≤0.55. By setting the outer diameter D1 of the stator 1 and the outer diameter D2 of the rotor 2 to satisfy 0.51≤D2 / D1≤0.55, the size ratio of the motor is optimized as a whole, and the split ratio of the motor is increased on the basis of ensuring the miniaturization of the motor. By increasing the split ratio of the motor, the outer diameter of the rotor 2 can be relatively increased, so that the arrangement space of the magnet can be increased, and then a suitable magnetic load can be obtained; secondly, the outer diameter of the rotor 2 is relatively increased, so that the moment of inertia of the rotor 2 is also increased, thereby improving the power density of the motor and improving the efficiency of the motor.

[0044] Specifically, Figure 3-8 , Fig.10 and Fig.11 Actual current / rated current=A%; Figure 3 , Figure 4 , Figure 6 and Fig.10 Actual power / rated power = B%; Figure 5 , Figure 8 and Fig.11 Actual efficiency / rated efficiency = F%; Figure 7 Actual copper loss in / copper loss at rated current = G%; Fig. 9 Take the actual cost / rated cost = H% as an example.

[0045] Specifically, Figure 3 For different D2 / D1, (actual power / rated power) and (actual current / rated current) form a line graph, where: Figure 3 The horizontal axis is (actual current / rated current), and the vertical axis is (actual power / rated power), that is, Figure 3 The line graph of B% and A% for different D2 / D1 is shown in FIG. 1 . The line graph of B% and A% corresponding to the ratios of D2 / D1 are shown as an example. Figure 3 It can be seen that for different D2 / D1, as A% increases, B% tends to increase, and when A% is 110.0%, the B% corresponding to different D2 / D1 reaches the peak value; but under the same current, when A% is 54.4% and the D2 / D1 ratio is in the range of 0.51 to 0.55, B% is the largest, and the corresponding motor power is the largest. When A% is 110.0% and the D2 / D1 ratio is 0.55, B% is the largest; when the D2 / D1 ratio is 0.51, B% is the second largest.

[0046] Therefore, when the ratio of D2 / D1 is set within the range of 0.51 to 0.55, the power density of the motor can be effectively improved, the performance of the motor can be optimized, and the efficiency of the motor can be improved.

[0047] Among them, in order to further improve the efficiency of the motor in the prior art, the parameters of the motor are mainly optimized from the perspective of the tooth yoke ratio and other aspects. Although the efficiency of the motor can be improved, it is difficult to quickly obtain the amount of coil windings in a single stator slot through these parameters, it is difficult to quickly determine the amount of magnets, and it is also difficult to quickly and efficiently determine the optimal setting position of the magnet slot 21. Therefore, in response to this problem, the motor optimizes the parameters of the motor from the three perspectives of the tooth yoke ratio, the stator slot 13 and the magnet slot 21, so that on the basis of further improving the motor power and motor efficiency, the amount of coil windings in a single stator slot 13, the amount of magnets in a single magnet slot 21, and the optimal setting position of the magnet slot 21 can be quickly and efficiently determined, thereby effectively shortening the development cycle of the motor and reducing the preparation cost of the motor. The details are as follows.

[0048] First, if Figure 1 As shown, the stator 1 includes a yoke 11 and a plurality of teeth 12, the plurality of teeth 12 are evenly spaced along the circumference of the stator 1, and a stator slot 13 is formed between any two adjacent teeth 12, and the winding coil is wound around the teeth 12 and partially distributed in the stator slot 13. By winding the winding coil around the teeth 12, the winding coil can generate a magnetic field after being energized, thereby driving the rotor 2 of the motor to move, and further enabling the driven structure connected to the rotor 2 to move.

[0049] Specifically, Figure 1As shown, the tooth width C of the tooth portion 12 and the thickness E of the yoke portion 11 satisfy the relationship: C / E=1.21~1.32. By setting the tooth width C of the tooth portion 12 and the thickness E of the yoke portion 11 to satisfy the relationship: C / E=1.21~1.32, it is easy to determine the amount of winding coils in a single stator slot 13, that is, based on the effective end surface area S2 of a single stator slot 13, the tooth-yoke ratio C / E, the axial length of the rotor 2, and the selection of the winding coil, the amount of winding coils in a single stator slot 13 can be determined quickly and efficiently, thereby shortening the preparation and development cycle of the motor and reducing the development cost of the motor. Among them, the thickness direction of the yoke portion 11 is parallel to the radial direction of the stator 1.

[0050] Furthermore, when the outer peripheral wall of the yoke 11 is not recessed, the thickness E of the yoke 11 is the radial length from the bottom wall of the stator slot 13 to the outer peripheral wall of the stator 1, that is, the thickness E of the yoke 11 = the radius of the circle where the outer peripheral wall of the stator 1 is located - the radius of the circle where the bottom wall of the stator slot 13 is located.

[0051] Furthermore, if Figure 1 As shown, when the outer peripheral wall of the yoke 11 is only provided with the first groove 111, and at least a part of the first groove 111 is distributed on the outer periphery of the tooth portion 12, the chamfer center of the chamfered corners of the bottom wall and the side wall of the stator slot 13 adjacent to the first groove 111 is used as the first reference point, and a circle is drawn with the first reference point as the center so as to be tangent to the slot wall of the first groove 111, and the tangent point is used as the second reference point. The thickness E of the yoke 11 is the difference between the minimum distance between the first reference point and the second reference point and the chamfer radius, that is: the thickness E of the yoke 11 = the minimum distance between the first reference point and the second reference point - the chamfer radius. The shape of the first groove 111 is not limited here. It can be understood that for first grooves 111 of different shapes, a circle is drawn with the first reference point as the center so as to be tangent to the groove wall of the first groove 111, and the number of tangent points obtained is greater than or equal to 1. When the number of tangent points is greater than 1, the difference between the minimum spacing between the first reference point and the second reference point and the fillet radius is the thickness E of the yoke 11. Specifically, in this embodiment, a circle is drawn with the first reference point as the center so as to be tangent to the groove wall of the first groove 111, and the number of tangent points obtained is 1, that is, only one second reference point can be obtained, and the thickness E of the yoke 11 is the difference between the spacing between the first reference point and the second reference point and the fillet radius.

[0052] Furthermore, if Figure 1 As shown, when the outer peripheral wall of the yoke 11 is provided with only the second groove 112, and the second groove 112 is distributed on the outer periphery of the stator slot 13, the minimum distance between the slot bottom wall of the stator slot 13 and the slot wall of the second groove 112 along the radial direction of the stator 1 is taken as the thickness E of the yoke 11. The shape of the second groove 112 is not limited here.

[0053] Furthermore, if Figure 1 As shown, when the outer peripheral wall of the yoke 11 is provided with a first groove 111 and a second groove 112, and at least a part of the first groove 111 is distributed on the outer periphery of the tooth portion 12, and the second groove 112 is distributed on the outer periphery of the stator slot 13, the difference between the minimum spacing between the first reference point and the second reference point and the fillet radius is taken as the first theoretical thickness E1, and the minimum spacing between the slot bottom wall of the stator slot 13 and the slot wall of the second groove 112 along the radial direction of the stator 1 is taken as the second theoretical thickness E2, and the first theoretical thickness E1 and the second theoretical thickness E2 are compared, and the smaller value of the first theoretical thickness E1 and the second theoretical thickness E2 is taken as the thickness E of the yoke 11. It can be understood that in this case, the first groove 111 and the second groove 112 can also be grooves that penetrate along the circumferential direction, or can be grooves that are independent of each other.

[0054] Specifically, Figure 4 For different C / E, (actual power / rated power) and (actual current / rated current) form a line graph, where: Figure 4 The horizontal axis is (actual current / rated current), and the vertical axis is (actual power / rated power), that is, Figure 4 The line graphs of B% and A% for different C / E ratios are shown in Figure 2. For example, the line graphs of B% and A% corresponding to C / E ratios of 1.05, 1.18, 1.21, 1.32 and 1.5 are shown in Figure 2. Figure 4 It can be seen that for different C / E, as A% increases, B% tends to increase, that is, the power of the motor tends to increase, and when A% is 110.0%, the B% corresponding to different C / Es all reach a peak value, that is, the power of the motor corresponding to different C / Es all reaches a peak value; under the same current, when A% is 54.4% and the C / E ratio is 1.5, B% is the largest, and the corresponding motor power is the largest; when A% is 110.0% and the C / E ratio is 1.5, B% is the largest, and the corresponding motor power is the largest.

[0055] Specifically, Figure 5 For different C / E, the (actual efficiency / rated efficiency) and (actual current / rated current) of the motor form a line graph, where: Figure 5 The horizontal axis is (actual current / rated current), and the vertical axis is (actual efficiency / rated efficiency). Figure 5 The line graphs of F% and A% for different C / E ratios are shown in Figure 2. For example, the line graphs of F% and A% corresponding to C / E ratios of 1.05, 1.18, 1.21, 1.32 and 1.5 are shown in Figure 2. Figure 5 It can be seen that when A% is 80.6%, F% is the largest, and the motor efficiency is the highest at this time; secondly, combined with Figure 4 and Figure 5 It can be seen that under the same A%, the larger the C / E ratio, the larger the corresponding B%, but the smaller the corresponding F%. Therefore, when selecting the C / E value, it is best to consider power and efficiency comprehensively and select a moderate C / E value. That is, by setting C / E = 1.21 ~ 1.32, you can get a relatively good effect of power and efficiency.

[0056] Furthermore, if Figure 1 As shown, the outer diameter D1 of the stator 1 and the effective end surface area S2 of a single stator slot 13 and the number Z of the stator slots 13 satisfy the relationship: D1 / (S2*Z)=0.04-0.065. By setting D1 / (S2*Z)=0.04-0.065, the effective end surface area S2 of a single stator slot 13 can be directly calculated based on the outer diameter D1 of the stator 1 and the number Z of the stator slots 13. According to the effective end surface area S2 of a single stator slot 13, the tooth yoke ratio, the axial length of the rotor 2, and the selection of the winding coil, the amount of the winding coil in a single stator slot 13 can be quickly and efficiently determined, thereby further shortening the development cycle of the motor and further reducing the preparation cost of the motor.

[0057] It should be noted that the area of ​​the portion of the stator slot 13 used to accommodate the winding coil is the effective end surface area of ​​a single stator slot 13. That is, for a single stator slot 13, the sum of the end surface area corresponding to the gap between adjacent winding coils and the effective end surface area of ​​a single stator slot 13 is the total end surface area of ​​the single stator slot 13.

[0058] Specifically, Figure 6 For different D1 / (S2*Z), (actual power / rated power) and (actual current / rated current) form a line graph, where: Figure 6 The horizontal axis is (actual current / rated current), and the vertical axis is (actual power / rated power), that is, Figure 6 The line graph of B% and A% for different D1 / (S2*Z) is shown in Figure 2. For example, the line graph of B% and A% corresponding to the ratios of D1 / (S2*Z) of 0.04, 0.045, 0.05, 0.06, 0.065 and 0.07 is shown in Figure 2. Figure 6 It can be seen that for different D1 / (S2*Z), as A% increases, B% tends to increase, and when A% is 110.0%, the B% corresponding to different D1 / (S2*Z) all reaches a peak value, that is, the power of the motor corresponding to different D1 / (S2*Z) all reaches a peak value; under the same A%, when A% is 54.4% and the ratio of D1 / (S2*Z) is 0.045, B% is the largest, and the corresponding motor power is the largest; when A% is 110.0% and the ratio of D2 / (S1*P) is 0.045, B% is the largest, and the corresponding motor power is the largest.

[0059] Specifically, Figure 7 For different D1 / (S2*Z), (actual copper loss / copper loss at rated current) and (actual current / rated current) form a line graph, where: Figure 7 The horizontal axis is (actual current / rated current), and the vertical axis is (actual copper loss / copper loss at rated current), that is, Figure 7 For different D1 / (S2*Z), G% and A% form a line graph. For example, the line graphs of G% and A% corresponding to the ratios of D1 / (S2*Z) of 0.04, 0.045, 0.05, 0.06, 0.065 and 0.07 are taken as examples. Figure 7 It can be seen that for different D1 / (S2*Z), as A% increases, G% tends to increase, and the corresponding actual copper loss tends to increase, and when A% is 110.0%, the G% corresponding to different D1 / (S2*Z) reaches a peak value, that is, the copper loss corresponding to different D1 / (S2*Z) reaches a peak value; under the same A%, when A% is 54.4% and the ratio of D1 / (S2*Z) is within 0.04-0.065, G% is significantly reduced, and the corresponding copper loss is significantly reduced; when A% is 110.0% and the ratio of D2 / (S1*P) is within 0.04-0.065, G% is significantly reduced, and the corresponding copper loss is significantly reduced; and when the ratio of D2 / (S1*P) is 0.04, G% is the smallest, that is, the corresponding copper loss is the smallest.

[0060] Specifically, Figure 8 For different D1 / (S2*Z), (actual efficiency / rated efficiency) and (actual current / rated current) form a line graph, where: Figure 8 The horizontal axis is (actual current / rated current), and the vertical axis is (actual efficiency / rated efficiency), that is, Figure 8 For different D1 / (S2*Z), the line graph of F% and A% is formed. For example, the line graph of F% and A% corresponding to the ratio of D1 / (S2*Z) of 0.04, 0.045, 0.05, 0.06, 0.065 and 0.07 is taken as an example. Figure 8 It can be seen that, under the same A%, the corresponding F% when the ratio of D1 / (S2*Z) is within 0.04-0.065 is significantly higher than the F% when the ratio of D1 / (S2*Z) is 0.07. And as A% increases, that is, when A% increases from 54.4% to 110.0%, the F% of the ratio of D2 / (S1*P) in the range of 0.04-0.065 decreases slowly and basically remains stable, and even the F% corresponding to the ratio of D2 / (S1*P) is 0.04 increases significantly; on the contrary, the F% corresponding to the ratio of D1 / (S2*Z) at 0.07 can be seen to have a significant decrease.

[0061] Specifically, Fig. 9 A bar chart is formed for different D1 / (S2*Z) and (actual cost / nominal cost), where Fig. 9 The horizontal axis is D1 / (S2*Z), and the vertical axis is (actual cost / rated cost), that is, Fig. 9 A bar graph is formed for different D1 / (S2*Z) and H%. For example, the ratios of D1 / (S2*Z) are 0.04, 0.045, 0.05, 0.06, 0.065 and 0.07. Fig. 9 It can be seen that as the value of D1 / (S2*Z) continues to increase, H% gradually decreases, and the corresponding motor cost gradually decreases. When the value of D1 / (S2*Z) is 0.04, H% is higher than 120.0%. Therefore, setting the range of D1 / (S2*Z) to 0.04~0.065 can effectively reduce costs.

[0062] In summary, combined Figure 6-9 When D1 / (S2*Z) is set within the range of 0.04 to 0.065, the amount of winding coils in a single stator slot 13 can be further determined quickly and efficiently, further shortening the motor development cycle and reducing the motor development cost; and the motor power density can be further optimized and the motor efficiency can be improved.

[0063] Secondly, if Figure 1 As shown, the rotor 2 is provided with a plurality of magnet slots 21 evenly spaced along the circumference, and the magnet end area of ​​each pole is S1 along the circumference of the rotor 2. The outer diameter D2 of the rotor 2, the magnet end area S1 of each pole and the number of poles P satisfy the relationship: D2 / (S1*P)=0.14~0.17. By setting the outer diameter D2 of the rotor 2, the magnet end area S1 of each pole and the number of poles P to satisfy the relationship: D2 / (S1*P)=0.14~0.17, the magnet end area S1 of each pole can be directly calculated according to the outer diameter D2 of the rotor 2 and the number of poles P, and the magnet end area S1 of each pole and the axial length of the rotor 2 can be quickly and efficiently determined. The amount of magnets in a single magnet slot 21 can be determined, thereby further shortening the development cycle of the motor and reducing the preparation cost of the motor.

[0064] Specifically, when the magnet slots 21 are in a straight line shape, each pole corresponds to one magnet slot 21, and the magnet end area S1 of each pole is the end area of ​​a corresponding magnet slot 21; when the magnet slots 21 are in a V shape, the magnet slots 21 corresponding to each pole are formed by two sub-magnet slots, and the magnet end area S1 of each pole is the end area of ​​the corresponding two sub-magnet slots.

[0065] It can be understood that the magnet end area S1 of each pole does not include the air gap end area of ​​the magnet slot, but is only the effective end area corresponding to the magnet for accommodating the magnet.

[0066] Specifically, Fig.10For different D2 / (S1*P), (actual power / rated power) and (actual current / rated current) form a line graph, where: Fig.10 The horizontal axis is (actual current / rated current), and the vertical axis is (actual power / rated power), that is, Fig.10 The line graph of B% and A% for different D2 / (S1*P) is shown in Figure 2. For example, the line graph of B% and A% corresponding to the ratio of D2 / (S1*P) of 0.14, 0.16, 0.17 and 0.18 is shown in Figure 2. Fig.10 It can be seen that for different D2 / (S1*P), as A% increases, B% tends to increase, that is, the power of the motor tends to increase, and when A% is 110.0%, the B% corresponding to different D2 / (S1*P)s all reach a peak value, that is, the power of the motor corresponding to different D2 / (S1*P)s all reaches a peak value; under the same A%, when A% is 54.4% and the ratio of D2 / (S1*P) is 0.14, B% is the largest, and the corresponding motor power is the largest, and as the ratio of D2 / (S1*P) increases, B% gradually decreases, and the corresponding motor power gradually decreases; when A% is 110.0% and the ratio of D2 / (S1*P) is 0.14, B% is the largest, and the corresponding motor power is the largest, and as the ratio of D2 / (S1*P) increases, B% gradually decreases, and the corresponding motor power gradually decreases.

[0067] Specifically, Fig.11 For different D2 / (S1*P), (actual efficiency / rated efficiency) and (actual current / rated current) form a line graph, where: Fig.11 The horizontal axis is (actual current / rated current), and the vertical axis is (actual efficiency / rated efficiency), that is, Fig.11 A line graph is formed for different D2 / (S1*P), F% and A%. For example, the line graphs of F% and A% corresponding to the ratios of D2 / (S1*P) of 0.14, 0.16, 0.17 and 0.18 are taken as examples. Fig.11 It can be seen that under the same A%, when A% is 54.4% and the ratio of D2 / (S1*P) is within 0.14-0.17, F% is higher, and the efficiency of the corresponding motor is higher; when A% is 110.0% and the ratio of D2 / (S1*P) is within 0.14-0.17, F% is higher, and the efficiency of the corresponding motor is higher; secondly, when A% is 110.0% and the ratio of D2 / (S1*P) is 0.14, F% is the largest, and the efficiency of the corresponding motor is the largest.

[0068] In summary, combined Figure 10-11When the ratio of D2 / (S1*P) is set within the range of 0.14 to 0.17, the amount of magnets in a single magnet slot 21 can be determined quickly and efficiently, further shortening the development cycle of the motor and reducing the preparation cost of the motor; and the power density of the motor can be further optimized, the efficiency of the motor can be improved, and the performance of the motor can be optimized.

[0069] Furthermore, if Figure 1 and Figure 2 As shown, the outer peripheral wall of the rotor 2 is concavely provided with a plurality of third grooves 22 at intervals along the circumferential direction. By setting the depth h of the third grooves 22 to: 0.1 mm ≤ h ≤ 0.3 mm, the cogging torque of the motor can be reduced by adjusting the air gap between the rotor 2 and the stator 1, thereby achieving the effect of reducing the vibration and noise of the motor.

[0070] Finally, if Figure 1 As shown, when the magnet slot 21 is in the shape of a straight line, along the radial direction of the rotor 2, the distance between the central axis of the rotor 2 and the outer side wall of the magnet slot 21 is a1; the distance a1 between the central axis of the rotor 2 and the outer side wall of the magnet slot 21, the outer diameter D2 of the rotor 2, the depth h of the third groove 22 and the number of poles P satisfy the relationship: a1 = [(D2) / 2-h]*cos(180° / P). Through this formula, the setting position of the straight-line magnet slot can be determined quickly and efficiently, and the magnet end area S1 of each pole can be determined by D2 / (S1*P), so that the setting position of the straight-line magnet slot and the amount of magnets in a single magnet slot 21 can be accurately determined.

[0071] When the magnet slot 21 is V-shaped, along the radial direction of the rotor 2, the minimum distance between the central axis of the rotor 2 and the outer wall of the magnet slot 21 is a2; the minimum distance a2 between the central axis of the rotor 2 and the outer wall of the magnet slot 21, the outer diameter D2 of the rotor 2 and the number of poles P satisfy the relationship: a2 = [(D2) / 2]*cos(180° / P)-[(D2) / 4]*sin(180° / P) / tanx; wherein the range of x is: 50°~65°. Through this formula, the setting position of the V-shaped magnet slot can be determined quickly and efficiently, and the magnet end area S1 of each pole can be determined through D2 / (S1*P), so that the setting position of the V-shaped magnet slot and the amount of magnets in a single magnet slot 21 can be accurately determined.

[0072] The number of poles P=2n, where n is a positive integer greater than or equal to 2. Preferably, n=4, that is, the number of poles P=8.

[0073] In summary, the motor optimizes the parameters of the motor from five perspectives: split ratio, tooth yoke ratio, stator slot 13, magnet slot 21, and depth of the third groove 22, which can effectively improve the power and efficiency of the motor and reduce the vibration and noise of the motor, so that the performance of the motor is good; secondly, on the basis of further improving the motor power and motor efficiency, the size of the stator 1 and the rotor 2, the amount of coil winding in a single stator slot 13, the amount of magnets in a single magnet slot 21, and the optimal setting position of the magnet slot 21 can be quickly and efficiently determined, thereby effectively shortening the development cycle of the motor and reducing the preparation cost of the motor.

[0074] The present invention also discloses a compressor, which comprises the above motor. The above motor can effectively improve the working performance of the compressor, can effectively improve the use performance of the compressor, and can effectively reduce the production cost of the compressor.

[0075] The present invention also discloses an air conditioner, which comprises the above compressor. The use of the above compressor can effectively improve the working performance of the air conditioner, can effectively improve the use performance of the air conditioner, and can effectively reduce the production cost of the compressor.

[0076] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A motor, comprising a stator (1) and a rotor (2), wherein the stator (1) is provided with a central axis hole, the rotor (2) is rotatably arranged in the central axis hole, the axis of the rotor (2) is coaxial with the axis of the stator (1), and characterized in that: The outer diameter D1 of the stator (1) and the outer diameter D2 of the rotor (2) satisfy the relationship: 0.51≤D2 / D1≤0.

55.

2. The motor according to claim 1, characterized in that The stator (1) comprises a yoke (11) and a plurality of tooth portions (12), wherein the plurality of tooth portions (12) are evenly spaced and distributed along the circumference of the stator (1), and the tooth width C of the tooth portion (12) and the thickness E of the yoke (11) satisfy the relationship: C / E=1.21-1.

32.

3. The motor according to claim 2, characterized in that A stator slot (13) is formed between any two adjacent teeth (12), and a winding coil is wound around the teeth (12) and distributed in the stator slot (13); The outer diameter D1 of the stator (1), the effective end surface area S2 of a single stator slot (13), and the number Z of the stator slots (13) satisfy the relationship: D1 / (S2*Z)=0.04-0.065; The effective end surface area S2 of a single stator slot (13) is a partial area for accommodating a winding coil.

4. The motor according to any one of claims 1 to 3, characterized in that: The rotor (2) is provided with a plurality of magnet slots (21) at even intervals along the circumferential direction; along the circumferential direction of the rotor (2), the magnet end area per pole is S1; and the relationship between the outer diameter D2 of the rotor (2), the magnet end area per pole S1 and the number of poles P satisfies: D2 / (S1*P)=0.14-0.

17.

5. The motor according to claim 4, characterized in that The outer peripheral wall of the rotor (2) is provided with a plurality of third grooves (22) at intervals along the circumferential direction, and along the radial direction of the rotor (2), the depth h of the third grooves (22) is in the range of 0.1 mm ≤ h ≤ 0.3 mm.

6. The motor according to claim 5, characterized in that When the magnet groove (21) is in a straight line shape, along the radial direction of the rotor (2), the distance between the central axis of the rotor (2) and the outer side wall of the magnet groove (21) is a1; The distance a1 between the central axis of the rotor (2) and the outer wall of the magnet groove (21), the outer diameter D2 of the rotor (2), the depth h of the third groove (22) and the number of poles P satisfy the relationship: a1 = [(D2) / 2-h]*cos(180° / P).

7. The motor according to claim 5, characterized in that When the magnet groove (21) is V-shaped, along the radial direction of the rotor (2), the minimum distance between the central axis of the rotor (2) and the outer side wall of the magnet groove (21) is a2; The minimum distance a2 between the central axis of the rotor (2) and the outer side wall of the magnet slot (21), the outer diameter D2 of the rotor (2) and the number of poles P satisfy the relationship: a2 = [(D2) / 2]*cos(180° / P)-[(D2) / 4]*sin(180° / P) / tanx; Among them, the range of x is: 50°~65°.

8. The motor according to claim 4, characterized in that The pole number P=2n, where n is a positive integer greater than or equal to 2.

9. A compressor, characterized in that A motor comprising any one of claims 1-8.

10. An air conditioner, characterized in that Comprising the compressor as claimed in claim 9.

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