Stator, high-efficiency induction motor and compressor

Abstract

The utility model relates to the technical field of compressors, and discloses a stator, a high-efficiency induction motor and a compressor. The stator comprises a stator iron core, the stator iron core is provided with a central hole and a stator yoke part, the stator yoke part is distributed along the circumferential direction of the central hole, a plurality of wire inlet slotted holes are formed along the circumferential direction of the inner side of the radial direction of the stator yoke part at intervals, and a stator tooth part is defined between every two adjacent wire inlet slotted holes. The stator yoke part and the stator tooth part are connected through a fillet, the center of the center hole is taken as a circle point, the radius of the center hole is set as R1, the radius of the arc edge, far away from the center hole, of the wire inlet slotted hole is set as R2, the radius of the fillet is set as R3, and the ratio of R1 to R3 is greater than or equal to 8.5 and less than or equal to 51; the stator core has the following technical effects that the magnetic field distribution of the stator core is changed, the yoke magnetic flux density of the stator core is reduced, and the loss of the stator core is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of compressors, and in particular relates to a stator, a high-efficiency induction motor and a compressor. Background Art

[0002] At present, in rotary AC fixed-frequency compressors, squirrel-cage induction motors are commonly used as motors. For this type of motor, since the motor efficiency and maximum torque cannot be further improved, it has become a pain point in the industry.

[0003] In order to provide motors with higher cost performance, the industry has tended towards higher power density motor designs in recent years. For the miniaturized and high-power design of induction motors, more turns and larger diameter enameled wires are usually embedded in the stator core wire slots, and the current common practice is to increase the stator slot area. However, increasing the stator slot area will reduce the area of ​​the stator core teeth and yoke, which will in turn increase the magnetic flux density of the stator core teeth and yoke, ultimately increasing the stator core loss and reducing the motor efficiency. Utility Model Content

[0004] In order to solve the deficiencies of the prior art, the utility model provides a stator and a high-efficiency induction motor and a compressor, which achieve the purpose of changing the magnetic field distribution of the stator core, reducing the yoke magnetic flux density of the stator core, and reducing the stator core loss.

[0005] The technical purpose to be achieved by the utility model is achieved through the following technical solutions:

[0006] The utility model provides a stator, comprising a stator core, wherein the stator core has a central hole and a stator yoke, and the stator yoke is distributed along the circumference of the central hole;

[0007] A plurality of wire entry slots are arranged at intervals along the inner circumferential direction of the radial direction of the stator yoke, a stator tooth portion is defined between two adjacent wire entry slots, and the stator yoke and the stator tooth portion are connected by a rounded corner;

[0008] Taking the center of the center hole as the circle point, setting the radius of the center hole as R1, setting the radius of the arc edge of the entry slot away from the center hole as R2, and setting the radius of the fillet as R3;

[0009] The ratio of R1 to R3 is greater than or equal to 8.5 and less than or equal to 51.

[0010] In some implementations, the ratio of R2 to R3 is greater than or equal to 12.75 and less than or equal to 79.05. Adjusting the ratio of the arc edge radius to the corner radius of the entry slot hole plays a further significant role in reducing the magnetic flux density of the stator core yoke and reducing the stator core loss.

[0011] In some implementations, the ratio of R2 to R1 is greater than or equal to 1.5 and less than or equal to 1.55. Adjusting the ratio of the arc edge radius of the entry slot hole to the center hole radius plays a further significant role in reducing the magnetic flux density of the stator core yoke and reducing the stator core loss.

[0012] In some implementations, the ratio of R2 to R3 is greater than or equal to 12.75 and less than or equal to 79.05;

[0013] The ratio of R2 to R1 is greater than or equal to 1.5 and less than or equal to 1.55, which limits the ratio of the arc edge radius of the entry slot hole to the fillet radius, and at the same time limits the ratio of the arc edge radius of the entry slot hole to the center hole radius, ensuring the best effect in reducing the magnetic flux density of the stator core yoke and reducing the stator core loss.

[0014] In some implementations, R1 is 25.5 mm, R2 is 39 mm, and R3 is 2.5 mm. The center hole radius, the arc edge radius of the wire entry slot hole, and the fillet radius under this set of numerical limits achieve the best effect in reducing the magnetic flux density of the stator core yoke and reducing the stator core loss.

[0015] In some implementations, the fillet is in tangent relationship with the stator teeth and the stator yoke, ensuring that adjusting the fillet radius can play a corresponding role in reducing the magnetic flux density of the stator core yoke and reducing the stator core loss.

[0016] In some implementations, the circumferential edge of the stator core is formed with a plurality of cut edges that are evenly spaced. Forming the cut edges on the circumferential edge of the stator core can provide a reflux channel for the compressor refrigerant oil, thereby improving the oil circulation rate of the compressor.

[0017] In some implementations, the cutting edge is a straight cutting edge and / or an arc cutting edge. Different cutting edge shapes can adapt to different motor housing shapes and motor installation requirements, and have the advantage of strong versatility.

[0018] The utility model also provides a motor, comprising a rotor core and a stator as described in any one of the above items, wherein the rotor core is located in the center hole. Compared with the traditional motor structure, the motor can achieve the purpose of reducing the motor input power, improving the motor efficiency and increasing the maximum torque of the motor.

[0019] The utility model also provides a compressor, including the motor described above. Compared with the traditional compressor structure, the compressor can achieve the purpose of reducing the motor input power, improving the motor efficiency and increasing the maximum torque of the motor.

[0020] In summary, the utility model has at least the following benefits:

[0021] 1. The utility model provides a stator, which changes the magnetic field distribution of the stator core by adjusting the size of the fillet at the connection between the stator yoke and the stator teeth, reduces the magnetic flux density of the yoke of the stator core, and thus achieves the purpose of reducing the stator core loss.

[0022] 2. The utility model provides a motor which, after applying the above-mentioned stator, can achieve the purpose of reducing the motor input power, improving the motor efficiency and increasing the maximum torque of the motor.

[0023] 3. The compressor provided by the utility model can improve its operating efficiency and performance after applying the above-mentioned stator and motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of a stator according to Embodiment 1 of the present utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the motor of Embodiment 2 of the present utility model;

[0026] Figure 3 This is a schematic diagram of the structure of a compressor according to Embodiment 3 of the present utility model;

[0027] 100, stator core; 110, center hole; 120, stator yoke; 130, wire entry slot hole; 140, stator tooth; 150, fillet; 160, trimming;

[0028] 200, motor;

[0029] 300, rotor core;

[0030] 400. Compressor. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. The described implementation is a part of the implementation of the utility model, not all of the implementations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0033] Embodiment 1:

[0034] See also Figure 1 A stator includes a stator core 100, the stator core 100 has a center hole 110 and a stator yoke 120, the stator yoke 120 is distributed along the circumference of the center hole 110, the center hole 110 is used for the installation of a rotor core 300, so that the rotor core 300 is rotatably arranged in the center hole 110, and the axis of the rotor core 300 is coaxial with the axis of the stator core 100.

[0035] A plurality of wire entry slots 130 are arranged at intervals along the radial inner side of the stator yoke 120 circumferentially, a stator tooth 140 is defined between two adjacent wire entry slots 130 , and the stator yoke 120 and the stator tooth 140 are connected by a fillet 150 .

[0036] The wire entry slots 130 are used for passing windings. The same winding is wound on a stator tooth 140 defined by two adjacent wire entry slots 130 , and the same winding is located in two adjacent wire entry slots 130 at the same time. In addition, at least a portion of two groups of windings exist in the same wire entry slot 130 .

[0037] At the same time, it can be known that since the wire entry slots 130 and the stator teeth 140 are both arranged along the circumference, a stator tooth 140 is defined between the two wire entry slots 130. It can also be understood that there is a wire entry slot 130 between the two stator teeth 140, that is, the number of the wire entry slots 130 is the same as the number of the stator teeth 140.

[0038] The stator yoke 120 and the stator tooth 140 are connected by a fillet 150. For ease of understanding, it is set here that the stator tooth 140 is defined between the adjacent first wire entry slot 130 and the second wire entry slot 130. The stator tooth 140 includes two opposite sides, namely a first side and a second side. The first side is a side of the first wire entry slot 130, and the second side is a side of the second wire entry slot 130. The first wire entry slot 130 and the second wire entry slot 130 both include arc edges for defining the stator yoke 120. The arc edge of the first wire entry slot 130 is connected to the first side by a fillet 150, and the arc edge of the second wire entry slot 130 is connected to the second side by a fillet 150. That is, the stator yoke 120 and the stator tooth 140 are connected by a fillet 150.

[0039] Taking the center of the center hole 110 as the point, assuming that the radius of the center hole 110 is R1, the radius of the arc edge of the entry slot hole 130 away from the center hole 110 is R2, and the radius of the fillet 150 is R3. It can be understood that the radius R1 of the center hole 110 and the radius R2 of the arc edge of the entry slot hole 130 are obtained based on the center of the center hole 110 as the point, while the point of the radius R3 of the fillet 150 is limited by the arc itself.

[0040] The ratio of the radius R1 of the center hole 110 to the radius R3 of the fillet 150 is greater than or equal to 8.5 and less than or equal to 51. For example, the radius R1 of the center hole 110 is 25.5 mm, and the radius R3 of the fillet 150 is 2.5 mm.

[0041] It is known that the industry usually adopts a method of increasing the stator slot area for miniaturized and high-power design of induction motors. However, this method will cause the tooth and yoke areas of the stator core 100 to be reduced, thereby leading to problems such as increased losses of the stator core 100. Based on this, in this embodiment, the ratio of the radius R1 of the center hole 110 to the radius R3 of the fillet 150 is adjusted. Within the range of the adjusted ratio, the yoke magnetic flux density of the stator core 100 can be better reduced, thereby achieving the purpose of reducing the losses of the stator core 100.

[0042] In some embodiments, the ratio of the radius R2 of the arc edge to the radius R3 of the fillet 150 is greater than or equal to 12.75 and less than or equal to 79.05, for example, the radius R2 of the arc edge is 39 mm, and the radius R3 of the fillet 150 is 2.5 mm. By adjusting the ratio of the radius of the arc edge of the entry slot 130 to the radius of the fillet 150, a further significant effect is played in reducing the magnetic flux density of the yoke of the stator core 100 and reducing the loss of the stator core 100.

[0043] After limiting the ratio range of the radius R1 of the center hole 110 to the radius R3 of the fillet 150, further limiting the ratio range of the radius R2 of the arc edge to the radius R3 of the fillet 150 can further achieve the purpose of reducing the loss of the stator core 100 and reducing the input power of the motor.

[0044] In some embodiments, the ratio of the radius R2 of the arc edge to the radius R1 of the center hole 110 is greater than or equal to 1.5 and less than or equal to 1.55, for example, the radius R2 of the arc edge is 39 mm, and the radius R1 of the center hole 110 is 25.5 mm. By adjusting the ratio of the radius of the arc edge of the entry slot hole 130 to the radius of the center hole 110, it plays a further significant role in reducing the magnetic flux density of the yoke of the stator core 100 and reducing the loss of the stator core 100.

[0045] After limiting the ratio range of the radius R1 of the center hole 110 to the radius R3 of the fillet 150, further limiting the ratio range of the radius R2 of the arc edge to the radius R1 of the center hole 110 can further achieve the purpose of reducing the loss of the stator core 100 and reducing the input power of the motor.

[0046] In some embodiments, the ratio of the radius R2 of the arc edge to the radius R3 of the fillet 150 is greater than or equal to 12.75 and less than or equal to 79.05; at the same time, the ratio of the radius R2 of the arc edge to the radius R1 of the center hole 110 is greater than or equal to 1.5 and less than or equal to 1.55. While limiting the ratio of the radius of the arc edge of the entry slot hole 130 to the radius of the fillet 150, the ratio of the radius of the arc edge of the entry slot hole 130 to the radius of the center hole 110 is also limited, ensuring that the best effect is achieved in reducing the magnetic flux density of the yoke of the stator core 100 and reducing the loss of the stator core 100.

[0047] For example, the radius R1 of the center hole 110 is 25.5 mm, the radius R2 of the arc edge is 39 mm, and the radius R3 of the fillet 150 is 2.5 mm. The radius of the center hole 110, the radius of the arc edge of the wire entry slot 130, and the radius of the fillet 150 under this set of numerical limits achieve the best effect in reducing the magnetic flux density of the yoke of the stator core 100 and reducing the loss of the stator core 100.

[0048] After limiting the ratio range of the radius R1 of the center hole 110 to the radius R3 of the fillet 150, the ratio range of the radius R2 of the arc edge to the radius R3 of the fillet 150, as well as the ratio range of the radius R2 of the arc edge to the radius R1 of the center hole 110 are also limited, to ensure that the effects of reducing the loss of the stator core 100 and reducing the input power of the motor are relatively better.

[0049] In some embodiments, the fillet 150 is tangent to the stator teeth 140 and the stator yoke 120 , ensuring that adjusting the radius of the fillet 150 can play a corresponding role in reducing the magnetic flux density of the yoke of the stator core 100 and reducing the loss of the stator core 100 .

[0050] In some embodiments, the circumferential edge of the stator core 100 is formed with a plurality of cut edges 160 , and the plurality of cut edges 160 are evenly spaced. Forming the cut edges 160 on the circumferential edge of the stator core 100 can provide a reflux channel for the compressor refrigerant oil, thereby improving the oil circulation rate of the compressor.

[0051] In a compressor, the stator core 100 is often disposed on an oil return channel of an oil pool. The refrigerant oil of the compressor needs to pass through the stator core 100 to return to the oil pool. Therefore, the cut edge 160 can provide a reflux channel for the refrigerant oil.

[0052] The cutting edge 160 is a straight cutting edge 160 and / or an arc cutting edge 160. Different shapes of the cutting edge 160 can adapt to different motor housing shapes and motor installation requirements, and has the advantage of strong versatility.

[0053] refer to Figure 1 The number of cutting edges 160 is four, and the four cutting edges 160 are evenly spaced along the circumferential edge of the stator core 100, and the four cutting edges 160 are all straight cutting edges 160. Of course, they can also be arc cutting edges 160, or include both straight cutting edges 160 and arc cutting edges 160. This is not limited in this example.

[0054] Embodiment 2:

[0055] This embodiment provides a motor based on the above embodiment. Figure 2 .

[0056] A motor, the motor 200 comprises a rotor core 300 and the stator in the above embodiment, the rotor core 300 is located in the center hole 110 and can rotate relative to the stator core 100, and an axial hole for installing a rotating shaft is formed in the middle of the rotor core 300.

[0057] The stator core 100 included in the motor has a stator yoke 120 and a stator tooth 140 connected by a fillet 150, and the ratio of the radius R1 of the center hole 110 to the radius R3 of the fillet 150 is greater than or equal to 8.5 and less than or equal to 51. By adjusting the size of the fillet 150, the purpose of reducing the yoke magnetic flux density of the stator core 100 and reducing the loss of the stator core 100 is achieved. Compared with the traditional motor structure, it has the advantages of reducing the motor input power, improving the motor efficiency and increasing the maximum torque of the motor.

[0058] Embodiment 3:

[0059] This embodiment provides a compressor based on the above embodiment. Figure 3 .

[0060] A compressor, the compressor 400 includes the above-mentioned motor 200. Compared with the traditional compressor structure, the compressor can achieve the purpose of reducing the motor input power, improving the motor efficiency and increasing the maximum torque of the motor.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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.

[0062] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0063] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0064] In the present utility model, unless otherwise clearly specified and limited, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0065] Although the utility model is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes based on the above content. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. A stator, characterized in that: The invention comprises a stator core (100), wherein the stator core (100) has a central hole (110) and a stator yoke (120), and the stator yoke (120) is distributed along the circumference of the central hole (110); A plurality of wire entry slots (130) are arranged at intervals along the inner circumferential direction of the radial direction of the stator yoke (120), a stator tooth portion (140) is defined between two adjacent wire entry slots (130), and a fillet (150) is used to connect the stator yoke (120) and the stator tooth portion (140); Taking the center of the center hole (110) as a circle point, assuming that the radius of the center hole (110) is R1, assuming that the radius of the arc edge of the wire entry slot (130) away from the center hole (110) is R2, and assuming that the radius of the rounded corner (150) is R3; The ratio of the R1 to the R3 is greater than or equal to 8.5 and less than or equal to 51.

2. The stator according to claim 1, characterized in that: The ratio of the R2 to the R3 is greater than or equal to 12.75 and less than or equal to 79.

05.

3. The stator according to claim 1, characterized in that: The ratio of R2 to R1 is greater than or equal to 1.5 and less than or equal to 1.

55.

4. The stator according to claim 1, characterized in that: The ratio of R2 to R3 is greater than or equal to 12.75 and less than or equal to 79.05; The ratio of R2 to R1 is greater than or equal to 1.5 and less than or equal to 1.

55.

5. The stator according to claim 4, characterized in that: The R1 is 25.5 mm, the R2 is 39 mm, and the R3 is 2.5 mm.

6. The stator according to claim 1, characterized in that: The fillet (150) is in tangent relation to the stator tooth portion (140) and the stator yoke portion (120).

7. The stator according to claim 1, characterized in that: A plurality of cut edges (160) are formed on the circumferential edge of the stator core (100), and the plurality of cut edges (160) are evenly spaced and distributed.

8. The stator according to claim 7, characterized in that: The cutting edge (160) is a straight cutting edge (160) and / or a circular cutting edge (160).

9. A motor, characterized in that: The motor (200) comprises a rotor core (300) and a stator according to any one of claims 1 to 8, wherein the rotor core (300) is located in the center hole (110).

10. A compressor, characterized in that: The compressor (400) comprises the motor according to claim 9.

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