Motor, compressor and refrigeration equipment

Abstract

The invention discloses a motor, a compressor and refrigeration equipment. The motor comprises a stator assembly and a rotor assembly. The stator assembly comprises a stator iron core; the rotor assembly is rotatably arranged in the stator assembly, the rotor assembly comprises a rotor iron core and a rotor magnet, the rotor iron core is provided with a plurality of magnet grooves, the plurality of magnet grooves are arranged at intervals along the circumferential direction of the rotor iron core, each magnet groove extends in the axial direction of the rotor iron core, the outer diameter of the stator iron core is D1, the number of pole pairs of the rotor assembly is P, the number of the rotor magnets under each pole is a, the total width of the rotor magnets is L1, the length of the rotor magnets in the axial direction of the rotor iron core is h, and the residual magnetization intensity of the rotor magnets is br, and the motor is small in size and large in output torque, and meanwhile, the efficiency and the power density of the motor can be improved.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to an electric motor, a compressor, and a refrigeration device. Background Technology

[0002] As a crucial device for converting electrical energy into mechanical energy, the electric motor plays a key role in various fields such as compressors, refrigeration equipment, and household appliances. An electric motor mainly consists of a stator assembly and a rotor assembly. The rotating magnetic field generated by the current in the stator windings interacts with the rotor magnets in the rotor assembly, thereby producing rotational torque. The parameters of each component of the motor directly affect its performance. In related technologies, electric motors occupy a large space and have limited output torque, which seriously affects their efficiency and power density. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a motor that is small in size and has a large output torque, while also improving the motor's efficiency and power density.

[0004] The present invention also proposes a compressor, which includes the aforementioned motor.

[0005] The present invention also proposes a refrigeration device, which includes the compressor described above.

[0006] An electric motor according to an embodiment of the present invention includes: a stator assembly and a rotor assembly. The stator assembly includes a stator core; the rotor assembly is rotatably disposed within the stator assembly, the rotor assembly including a rotor core and a rotor magnet, the rotor core having a plurality of magnet slots spaced apart along the circumferential direction of the rotor core and each magnet slot extending in the axial direction of the rotor core, wherein the outer diameter of the stator core is D1, the number of pole pairs of the rotor assembly is P, the number of rotor magnet plates per pole is a, the total width of the rotor magnet is L1, the length of the rotor magnet along the axial direction of the rotor core is h, and the remanent magnetization of the rotor magnet is br, and satisfies:

[0007]

[0008] According to an embodiment of the present invention, the motor is provided with a stator assembly having a stator core and a rotor assembly having a rotor core and rotor magnets, and is defined as follows: The stator core has an outer diameter of D1, the rotor assembly has P pole pairs, the number of rotor magnet plates per pole is a, the total width of the rotor magnets is L1, the length of the rotor magnets along the axial direction of the rotor core is h, and the remanent magnetization of the rotor magnets is br. This design can reduce the size of the motor, allowing it to provide sufficient output torque and improving both efficiency and power density.

[0009] According to some embodiments of the present invention,

[0010] According to some embodiments of the present invention, the outer diameter D1 of the stator core satisfies: 90mm≤D1≤112mm.

[0011] According to some embodiments of the present invention, the number of pole pairs P of the rotor assembly satisfies: P≥5.

[0012] According to some embodiments of the present invention, the stator core has a plurality of stator slots spaced apart along the circumferential direction of the stator core, the number of stator slots being Q, and satisfying Q≥15.

[0013] In some embodiments of the present invention, the stator core has a plurality of stator slots spaced apart along the circumferential direction of the stator core, the number of stator slots is Q, the number of phases of the motor is m, and satisfies: Q / 2mP < 1.

[0014] In some embodiments of the present invention, the magnet slot is straight in a cross-section perpendicular to the axial direction of the rotor core, and the line connecting the midpoint of the magnet slot in the length direction and the center of the rotor core is perpendicular to the magnet slot.

[0015] In some embodiments of the present invention, the magnet slot includes a first slot and a second slot, the first slot and the second slot being at an angle to each other, and the first slot and the second slot being inclined in a direction away from each other in a direction away from the axis of the rotor core.

[0016] In some embodiments of the present invention, the first slot and the second slot are spaced apart or connected in the direction close to the rotor core axis.

[0017] In some embodiments of the present invention, on a cross-section perpendicular to the axial direction of the rotor core, the magnet slot includes a first slot, a second slot, and a third slot. The line connecting the midpoint of the second slot along its length and the center of the rotor core is perpendicular to the second slot. The first slot and the third slot are located on the side of the second slot away from the rotor core axis. In the direction away from the rotor core axis, the first slot and the third slot are inclined in a direction away from each other.

[0018] In some embodiments of the present invention, the end of the first slot near the rotor core axis and the end of the third slot near the rotor core axis are respectively located at both ends of the length direction of the second slot.

[0019] In some embodiments of the present invention, the end of the first slot near the rotor core axis and the end of the third slot near the rotor core axis are respectively located at the two ends of the second slot along its length direction and are connected or spaced apart.

[0020] According to some embodiments of the present invention, the magnet slot extends through the rotor core along the axial direction of the rotor core.

[0021] The compressor according to an embodiment of the present invention includes: the motor described above.

[0022] According to an embodiment of the compressor, a stator assembly having a stator core and a rotor assembly having a rotor core and rotor magnets are provided on its motor, and the compressor is defined as follows: The stator core has an outer diameter of D1, the rotor assembly has P pole pairs, the number of rotor magnet plates per pole is a, the total width of the rotor magnets is L1, the length of the rotor magnets along the axial direction of the rotor core is h, and the remanent magnetization of the rotor magnets is br. This design can reduce the size of the motor, allowing it to provide sufficient output torque, improving both motor efficiency and power density, thereby reducing the size of the compressor and increasing its efficiency.

[0023] A refrigeration device according to an embodiment of the present invention includes: the compressor described above.

[0024] According to an embodiment of the refrigeration apparatus of the present invention, a stator assembly having a stator core and a rotor assembly having a rotor core and a rotor magnet are provided on the motor of the compressor, and the refrigeration apparatus is defined as follows: The stator core has an outer diameter of D1, the rotor assembly has P pole pairs, the number of rotor magnet plates per pole is a, the total width of the rotor magnets is L1, the length of the rotor magnets along the axial direction of the rotor core is h, and the remanent magnetization of the rotor magnets is br. This design can reduce the size of the motor, allowing it to provide sufficient output torque, improving both motor efficiency and power density. This, in turn, reduces the size of the compressor and increases its efficiency, ultimately improving the performance of the refrigeration equipment.

[0025] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0027] Figure 1 This is a cross-sectional view of a motor according to an embodiment of the present invention, wherein a = 1;

[0028] Figure 2 This is a cross-sectional view of a motor according to an embodiment of the present invention, wherein a = 2;

[0029] Figure 3 This is a cross-sectional view of a motor according to an embodiment of the present invention, wherein a = 3;

[0030] Figure 4 This is a cross-sectional view of the rotor assembly of an electric motor according to an embodiment of the present invention;

[0031] Figure 5 This is a cross-sectional view of a compressor according to an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the parameters of the residual magnetization intensity of the rotor magnet of the motor according to an embodiment of the present invention.

[0033] Figure label:

[0034] 100. Electric motor;

[0035] 1. Stator assembly; 11. Stator core; 111. Stator slot; 12. Stator winding;

[0036] 2. Rotor assembly; 21. Rotor core; 22. Rotor magnet; 23. Magnet slot; 231. First slot; 232. Second slot; 233. Third slot;

[0037] 200. Compressor;

[0038] 3. Crankshaft;

[0039] 4. Compression component;

[0040] 5. Shell;

[0041] 6. Liquid reservoir;

[0042] 7. Exhaust pipe. Detailed Implementation

[0043] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0044] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0045] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] The following is for reference. Figures 1-6 A motor 100 according to an embodiment of the present invention is described.

[0047] like Figure 1 and Figure 5 As shown, the motor 100 according to an embodiment of the present invention includes a stator assembly 1 and a rotor assembly 2.

[0048] Specifically, such as Figure 1-4 As shown, the stator assembly 1 includes a stator core 11, and the rotor assembly 2 is rotatably disposed within the stator assembly 1. The rotor assembly 2 includes a rotor core 21 and a rotor magnet 22. The rotor core 21 has a plurality of magnet slots 23, which are spaced apart along the circumferential direction of the rotor core 21 and each magnet slot 23 extends in the axial direction of the rotor core 21.

[0049] Furthermore, the stator assembly 1 also includes a stator winding 12. The stator core 11 has multiple stator slots 111 spaced apart along the circumferential direction of the stator core 11. The stator winding 12 is wound within the stator slots 111. When alternating current is applied to the stator winding 12, the stator core 11 can generate a rotating magnetic field. The rotor magnet 22 is disposed within the magnet slot 23 and extends along the axial direction of the rotor core 21. The rotor magnet 22 can be a permanent magnet or an electromagnet, capable of responding to the rotating magnetic field generated by the stator assembly 1, generating magnetic force, causing the rotor core 21 to rotate, thereby providing torque. The multiple magnet slots 23 spaced apart along the circumferential direction of the rotor core 21 help improve the distribution of the magnetic field, reduce the non-uniformity of the magnetic field, and thus reduce hysteresis and eddy current losses during the operation of the motor 100. By setting the stator assembly 1 and rotor assembly 2 as described above, the normal operation of the motor 100 can be achieved.

[0050] Wherein, the outer diameter of the stator core 11 is D1, the number of pole pairs of the rotor assembly 2 is P, the number of rotor magnets 22 per pole is a, the total width of the rotor magnets 22 is L1, the length of the rotor magnets 22 along the axial direction of the rotor core 21 is h, and the remanent magnetization of the rotor magnets 22 is br, and satisfies:

[0051]

[0052] Specifically, for ease of expression, so that S is related to the volume of rotor magnet 22. a*L1*h is proportional to the total volume of rotor magnet 22. The volume of rotor magnet 22 determines the maximum magnetic energy it can store. A larger rotor magnet 22 can provide greater output torque. If the volume of rotor magnet 22 is too small, i.e., the value of a*L1*h is too small, S will be greater than 55. In this case, the volume of rotor magnet 22 is too small, and motor 100 cannot provide sufficient output torque. If the volume of rotor magnet 22 is too large, i.e., the value of a*L1*h is too large, S will be less than 47. In this case, the volume of rotor magnet 22 is too large, which increases the overall size of motor 100, which may affect the application scenarios of motor 100 and also reduce the power density of motor 100.

[0053] By limiting S to between 47 and 55, it is beneficial to limit the number and volume of rotor magnets 22 within a reasonable range, ensuring that the size of motor 100 is not too large, while enabling motor 100 to provide sufficient output torque and improve the power density of motor 100.

[0054] Furthermore, S is related to the outer diameter of the stator core 11. If D1 is too large, S will be greater than 55, which will increase the overall size of the motor 100, making it too bulky and reducing its power density, thus affecting its application scenarios. If D1 is too small, S will be less than 47, which will result in the stator core 11 not being able to accommodate enough magnetic flux, hindering the torque output of the motor 100. Limiting S to between 47 and 55 helps to keep the outer diameter of the stator core 11 within a reasonable range, ensuring the output torque of the motor 100 while reducing its size, thus facilitating its installation and application.

[0055] Furthermore, S is related to the number of pole pairs in rotor assembly 2. If P is too small, S will be less than 47. In this case, the number of pole pairs in rotor assembly 2 is too small, resulting in too few magnet slots 23 and rotor magnets 22. This reduces the output torque of motor 100, and increases the synchronous speed of motor 100, leading to increased hysteresis and eddy current losses. Simultaneously, a smaller number of pole pairs will cause uneven magnetic field distribution, increasing torque fluctuations and causing vibration and noise during motor 100 operation. If P is too large, S will be greater than 55. In this case, an excessive number of pole pairs will increase the manufacturing cost and size of motor 100.

[0056] Limiting S to between 47 and 55 helps to limit the number of pole pairs of rotor assembly 2 within a reasonable range, ensuring that the manufacturing cost and size of motor 100 are not too large, while making the change in magnetic flux generated by each pole smoother, reducing torque fluctuations, thereby reducing vibration and noise, making the operation of motor 100 more stable, while reducing the synchronous speed of motor 100 and reducing hysteresis and eddy current losses, thereby improving the efficiency of motor 100.

[0057] In addition, S is also related to the remanent magnetization of the rotor magnet 22. A rotor magnet 22 with a larger remanent magnetization can generate a larger back electromotive force with the stator winding 12 during rotation, thereby reducing the current in the stator winding 12, reducing copper losses, and improving the efficiency of the motor 100. It should be noted that, as Figure 6 As shown in the example, the residual magnetization of rotor magnet 22 is measured at a temperature of 20°C. This allows for the control of variables, reducing the influence of temperature on the S value and improving the accuracy of control conditions.

[0058] Understandably, by limiting S to between 47 and 55, the size of the motor 100 can be reduced, allowing the motor 100 to provide sufficient output torque, thereby improving the efficiency and power density of the motor 100. Furthermore, increasing the number of pole pairs in the rotor assembly 2 can effectively reduce torque fluctuations, thereby reducing vibration and noise, and making the operation of the motor 100 smoother.

[0059] According to an embodiment of the present invention, the motor 100 is provided with a stator assembly 1 having a stator core 11 and a rotor assembly 2 having a rotor core 21 and a rotor magnet 22, and the motor is defined as follows: The stator core 11 has an outer diameter of D1, the rotor assembly 2 has P pole pairs, the number of rotor magnets 22 per pole is a, the total width of the rotor magnets 22 is L1, the length of the rotor magnets 22 along the axial direction of the rotor core 21 is h, and the remanent magnetization of the rotor magnets 22 is br. This design can reduce the size of the motor 100, allowing it to provide sufficient output torque and improving both its efficiency and power density.

[0060] In some embodiments of the present invention, such as Figure 1-4 As shown, It is understandable that by limiting S to between 47 and 50, the aforementioned beneficial technical effects can be further enhanced, making it easier to reduce the size of the motor 100, enabling the motor 100 to provide sufficient output torque, and further improving the efficiency and power density of the motor 100.

[0061] In some embodiments of the present invention, such as Figure 1 As shown, the outer diameter D1 of the stator core 11 satisfies: 90mm ≤ D1 ≤ 112mm. If D1 is greater than 112mm, the overall size of the motor 100 will increase, resulting in an excessively large volume and reduced power density, affecting its application scenarios. If D1 is less than 90mm, the stator core 11 will not be able to accommodate sufficient magnetic flux, which is detrimental to the torque output of the motor 100. When the motor 100 is used in compressors 200 and refrigeration equipment, it will fail to meet the required cooling capacity. Limiting D1 to between 90mm and 112mm helps to keep the outer diameter of the stator core 11 within a reasonable range, ensuring the output torque of the motor 100 and meeting the required cooling capacity while reducing the size of the motor 100, thus facilitating its installation and application.

[0062] In some embodiments of the present invention, such as Figure 1 , Figure 2 and Figure 3 As shown, the number of pole pairs P of rotor assembly 2 satisfies: P ≥ 5. It can be understood that the number of pole pairs P of rotor assembly 2 can be 5, 6, 7, or 8, etc. Figure 1In the example shown, the number of pole pairs P of rotor assembly 2 is 5. Increasing the number of pole pairs of rotor assembly 2 results in a corresponding increase in the number of magnet slots 23 and rotor magnets 22, ensuring the output torque of motor 100 and improving power density. The synchronous speed of motor 100 is inversely proportional to the number of pole pairs; increasing the number of pole pairs reduces the synchronous speed of motor 100, reducing hysteresis and eddy current losses, thereby improving motor 100 efficiency. Furthermore, increasing the number of pole pairs makes the magnetic field distribution more uniform, allowing for smoother changes in magnetic flux generated by each pole, reducing torque fluctuations, and thus reducing vibration and noise, resulting in smoother operation of motor 100. Of course, the number of pole pairs of rotor assembly 2 cannot be too large, otherwise it will increase the manufacturing cost and size of motor 100. In specific embodiments, the number of pole pairs can be selected and adjusted according to specific application requirements and cost-effectiveness.

[0063] In some embodiments of the present invention, such as Figure 1 , Figure 2 and Figure 3 As shown, the stator core 11 has a plurality of stator slots 111 spaced apart along the circumferential direction of the stator core 11. The number of stator slots 111 is Q, and Q ≥ 15. It can be understood that the number Q of stator slots 111 can be 15, 18, 21, or 24, etc. Figure 1 In the example shown, the number of stator slots 111, Q, is 15. Increasing the number of stator slots 111 allows for more stator windings 12 to be accommodated, thereby increasing the magnetic flux and improving the output torque of the motor 100. At the same time, increasing the number of stator slots 111 helps to obtain a more uniform magnetic field distribution, reducing magnetic field non-uniformity, thereby reducing hysteresis and eddy current losses, and thus improving the efficiency of the motor 100.

[0064] In addition, more stator slots 111 can reduce the contribution of a single slot to the magnetic field, thereby reducing torque ripple, vibration and noise, and improving the smoothness of motor 100 operation. Of course, the number of stator slots 111 cannot be too large, otherwise it will lead to an increase in the manufacturing cost and size of motor 100. In specific embodiments, the number of stator slots 111 can be selected and adjusted according to specific application requirements and cost-effectiveness.

[0065] In some embodiments of the present invention, such as Figure 1 , Figure 2 and Figure 3As shown, the stator core 11 has multiple stator slots 111 spaced apart along the circumferential direction of the stator core 11. The number of stator slots 111 is Q, and the number of phases of the motor 100 is m, satisfying Q / 2mP < 1. This allows the stator winding 12 to adopt a concentrated winding form. The concentrated winding structure is simple, and the stator winding 12 can be wound between adjacent stator slots 111, making the manufacturing process of the motor 100 simpler and reducing the amount of wire used in the stator winding 12, thus helping to reduce manufacturing and assembly costs. The concentrated winding form of the stator winding 12 results in a smaller winding head extending from the stator slot 111, meaning that when Q / 2mP < 1, under the same current conditions, the resistive loss of the stator winding 12 is lower, which helps to improve the efficiency and performance of the motor 100.

[0066] In some embodiments of the present invention, such as Figure 1 As shown, in a cross-section perpendicular to the axial direction of the rotor core 21, the magnet slots 23 are straight lines, and the line connecting the midpoint of the magnet slot 23 along its length to the center of the rotor core 21 is perpendicular to the magnet slot 23. At this time, the number a of rotor magnets 22 per pole is 1. The rotor magnets 22 are arranged parallel to the tangent direction of the rotor core 21, and the distances between the multiple magnet slots 23 and the center of the rotor core 21 are equal. This facilitates the arrangement of the magnet slots 23 at intervals along the circumferential direction of the rotor core 21, resulting in a more uniform magnetic field distribution, reduced hysteresis and eddy current losses, and thus improved efficiency of the motor 100. Setting the magnet slots 23 as straight lines also facilitates processing, thereby reducing the manufacturing cost of the motor 100.

[0067] In some embodiments of the present invention, such as Figure 2 As shown, the magnet slot 23 includes a first slot 231 and a second slot 232, which are at an angle to each other. The first slot 231 and the second slot 232 are inclined in a direction away from each other in the direction away from the axis of the rotor core 21. It can be understood that at this time, the number a of rotor magnets 22 under each pole is 2. On the cross-section perpendicular to the axial direction of the rotor core 21, the rotor magnet 22 slot is V-shaped. Two rotor magnets 22 can be placed in a single magnet slot 23, resulting in a larger magnetic field density, which can increase the rotational torque of the rotor core 21. Moreover, the structure of the magnet slot 23 is relatively simple, which facilitates the processing of the rotor magnet 22 slot.

[0068] In some embodiments of the present invention, such as Figure 2As shown, the first slot 231 and the second slot 232 are spaced apart or connected in the direction near the axis of the rotor core 21. It can be understood that when the first slot 231 and the second slot 232 are connected in the direction near the axis of the rotor core 21, a continuous magnetic field can be formed, enhancing the magnetic field strength and improving the output torque and efficiency of the motor 100. Alternatively, when the first slot 231 and the second slot 232 are spaced apart in the direction near the axis of the rotor core 21, magnetic leakage can be effectively reduced, lowering the energy loss of the motor 100 during operation, thereby improving the efficiency and performance of the motor 100. Furthermore, the spaced-apart rotor magnets 22 can also reduce the manufacturing cost and material consumption of the motor 100.

[0069] In some embodiments of the present invention, such as Figure 3 As shown, in a cross-section perpendicular to the axial direction of the rotor core 21, the magnet slot 23 includes a first slot 231, a second slot 232, and a third slot 233. The line connecting the midpoint of the second slot 232 along its length to the center of the rotor core 21 is perpendicular to the second slot 232. The first slot 231 and the third slot 233 are located on the side of the second slot 232 away from the axis of the rotor core 21. In the direction away from the axis of the rotor core 21, the first slot 231 and the third slot 233 are inclined away from each other. It can be understood that at this time, the number a of rotor magnets 22 per pole is 3. In a cross-section perpendicular to the axial direction of the rotor core 21, the magnet slot 23 is U-shaped. Three rotor magnets 22 can be placed in a single magnet slot 23, resulting in a larger magnetic field density, which can increase the rotational torque of the rotor core 21.

[0070] In some embodiments of the present invention, such as Figure 3 As shown, the end of the first slot 231 near the axis of the rotor core 21 and the end of the third slot 233 near the axis of the rotor core 21 are located at opposite ends of the length of the second slot 232. When installing the rotor magnet 22, the rotor magnet 22 in the second slot 232 can be installed first, and then the rotor magnets 22 in the first slot 231 and the third slot 233 can be installed together. The installation of the rotor magnet 22 is relatively convenient, and the machining process of the magnet slot 23 is relatively simple.

[0071] In some embodiments of the present invention, such as Figure 3As shown, the ends of the first slot 231 and the third slot 233 near the rotor core 21 are connected or spaced apart along the length of the second slot 232. It can be understood that connecting the ends of the first slot 231 and the third slot 233 near the rotor core 21 along the length of the second slot 232 creates a continuous magnetic field, enhancing the magnetic field strength and improving the output torque and efficiency of the motor 100. Alternatively, spaced-apart magnets effectively reduce magnetic leakage, lowering energy loss during operation and improving the efficiency and performance of the motor 100. Furthermore, spaced-apart magnets can reduce manufacturing costs and material consumption of the motor 100.

[0072] In some embodiments of the present invention, such as Figure 4 As shown, the magnet slot 23 penetrates the rotor core 21 along its axial direction. In a cross-section perpendicular to the axial direction of the rotor core 21, the magnet slot 23 is I-shaped, which facilitates the assembly of the rotor magnet 22 into the magnet slot 23, reducing operational difficulty and improving assembly efficiency. Furthermore, the through-slot 23 provides a more direct and continuous magnetic flux path, thereby enhancing the magnetic flux and increasing the magnetic field strength of the motor 100, thus improving the output torque of the motor 100. Simultaneously, the through-slot 23 helps achieve a more uniform magnetic field distribution, reducing magnetic field inhomogeneity, thereby reducing hysteresis and eddy current losses and improving the efficiency of the motor 100.

[0073] The compressor 200 according to an embodiment of the present invention is described below.

[0074] The compressor 200 according to an embodiment of the present invention includes the motor 100 described above.

[0075] Specifically, such as Figure 1-4 As shown, combined with Figure 5 The compressor 200 can be a rotary compressor. Rotary compressors have advantages such as high efficiency, stability, and reliability. They can reduce energy conversion losses, ensure reliable operation, and are quieter during operation, reducing vibration and noise, thus improving the user experience. For example, the rotary compressor can be a single-cylinder rotary compressor.

[0076] Specifically, the compressor 200 may include a motor 100, a crankshaft 3, and a compression assembly 4. The motor 100 includes a stator assembly 1 and a rotor assembly 2. The stator assembly 1 includes a stator core 11. The rotor assembly 2 is rotatably disposed within the stator assembly 1. One end of the crankshaft 3 is connected to the rotor assembly 2, and the compression assembly 4 is connected to and cooperates with the other end of the crankshaft 3. The rotor assembly 2 includes a rotor core 21 and rotor magnets 22. The rotor core 21 has a plurality of magnet slots 23, which are spaced apart along the circumferential direction of the rotor core 21, and each magnet slot 23 extends in the axial direction of the rotor core 21.

[0077] The stator assembly 1 further includes a stator winding 12. The stator core 11 has multiple stator slots 111 spaced apart along the circumferential direction of the stator core 11. The stator winding 12 is wound inside the stator slots 111. When alternating current is applied to the stator winding 12, the stator core 11 can generate a rotating magnetic field. The rotor magnet 22 is disposed in the magnet slot 23 and extends along the axial direction of the rotor core 21. The rotor magnet 22 can be a permanent magnet or an electromagnet, and can respond to the rotating magnetic field generated by the stator assembly 1, generating magnetic force to rotate the rotor core 21, thereby providing torque. Furthermore, the rotation of the rotor core 21 can drive the crankshaft 3 to rotate along the central axis of the rotor core 21. The rotation of the crankshaft 3 can drive the compression assembly 4 to work, realizing the transmission of the output force of the motor 100 to the compression assembly 4, so as to realize the operation of the compressor 200.

[0078] Wherein, the outer diameter of the stator core 11 is D1, the number of pole pairs of the rotor assembly 2 is P, the number of rotor magnets 22 per pole is a, the total width of the rotor magnets 22 is L1, the length of the rotor magnets 22 along the axial direction of the rotor core 21 is h, and the remanent magnetization of the rotor magnets 22 is br, and satisfies:

[0079]

[0080] Understandably, by limiting S to between 47 and 55, the size of motor 100 can be reduced, allowing it to provide sufficient output torque and improving both efficiency and power density. This, in turn, enables the miniaturization of compressor 200, reducing its size and increasing its efficiency. Furthermore, increasing the number of pole pairs in rotor assembly 2 effectively reduces torque fluctuations, thereby reducing vibration and noise, resulting in smoother operation of motor 100 and ultimately enhancing the stability of compressor 200 operation.

[0081] According to an embodiment of the present invention, the compressor 200 is provided with a stator assembly 1 having a stator core 11 and a rotor assembly 2 having a rotor core 21 and a rotor magnet 22 on its motor 100, and the compressor 200 is defined as follows: The stator core 11 has an outer diameter of D1, the rotor assembly 2 has P pole pairs, the number of rotor magnets 22 per pole is a, the total width of the rotor magnets 22 is L1, the length of the rotor magnets 22 along the axial direction of the rotor core 21 is h, and the remanent magnetization of the rotor magnets 22 is br. This design can reduce the size of the motor 100, allowing it to provide sufficient output torque, improving its efficiency and power density, thereby reducing the size of the compressor 200 and improving its efficiency.

[0082] In some embodiments, such as Figure 5 As shown, the compressor 200 includes a housing 5, and the compression assembly 4, motor 100 and crankshaft 3 are all housed inside the housing 5. The housing 5 can protect the compression assembly 4, motor 100 and crankshaft 3, preventing them from being exposed and damaged. The housing 5 can also seal the compression assembly 4, motor 100 and crankshaft 3, ensuring the normal operation of the compressor 200 and improving its service life.

[0083] In some embodiments, such as Figure 5 As shown, the compressor 200 also includes a liquid receiver 6, which is connected to the compression assembly 4. When the compressor 200 is operating, the low-temperature, low-pressure refrigerant that needs to be compressed can enter the compression assembly 4 through the liquid receiver 6. The compression assembly 4 compresses the low-temperature, low-pressure refrigerant to form a high-temperature, high-pressure refrigerant. The high-temperature, high-pressure refrigerant can be discharged from the housing 5 through the exhaust pipe 7 connected to the housing 5, thus realizing the compression operation of the compressor 200. Simultaneously, the liquid receiver 6 enables gas-liquid separation of the refrigerant, ensuring reliable compression of the refrigerant within the compression assembly 4 and ensuring the reliable operation of the compressor 200.

[0084] The following describes a refrigeration device according to an embodiment of the present invention.

[0085] The refrigeration device according to an embodiment of the present invention includes the compressor 200 described above.

[0086] According to an embodiment of the refrigeration device of the present invention, a stator assembly 1 having a stator core 11 and a rotor assembly 2 having a rotor core 21 and a rotor magnet 22 are provided on the motor 100 of the compressor 200, and the refrigeration device is defined as follows: The stator core 11 has an outer diameter of D1, the rotor assembly 2 has P pole pairs, the number of rotor magnets 22 per pole is a, the total width of the rotor magnets 22 is L1, the length of the rotor magnets 22 along the axial direction of the rotor core 21 is h, and the remanent magnetization of the rotor magnets 22 is br. This design can reduce the size of the motor 100, allowing it to provide sufficient output torque, improving its efficiency and power density, thereby reducing the size of the compressor 200 and increasing its efficiency, which is beneficial for improving the performance of the refrigeration equipment.

[0087] Other configurations and operations of the compressor 200 and refrigeration equipment according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0088] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0089] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electric motor, characterized in that, include: A stator assembly, the stator assembly including a stator core; A rotor assembly rotatably disposed within the stator assembly, the rotor assembly including a rotor core and rotor magnets, the rotor core having a plurality of magnet slots spaced apart along the circumferential direction of the rotor core and each magnet slot extending in the axial direction of the rotor core. Wherein, the outer diameter of the stator core is D1, the number of pole pairs of the rotor assembly is P, the number of rotor magnet plates under each pole is a, the total width of the rotor magnet is L1, the length of the rotor magnet along the axial direction of the rotor core is h, and the remanent magnetization of the rotor magnet is br, and satisfies:

2. The motor according to claim 1, characterized in that, 3. The motor according to claim 1, characterized in that, The outer diameter D1 of the stator core satisfies: 90mm≤D1≤112mm.

4. The motor according to claim 1, characterized in that, The number of pole pairs P of the rotor assembly satisfies: P≥5.

5. The motor according to claim 1, characterized in that, The stator core has a plurality of stator slots spaced apart along the circumferential direction of the stator core, the number of stator slots being Q, and satisfying Q≥15.

6. The motor according to any one of claims 1-5, characterized in that, The stator core has a plurality of stator slots spaced apart along the circumferential direction of the stator core, the number of stator slots is Q, the number of phases of the motor is m, and satisfies: Q / 2mP<1.

7. The motor according to any one of claims 1-5, characterized in that, In a cross-section perpendicular to the axial direction of the rotor core, the magnet slot is straight, and the line connecting the midpoint of the magnet slot along its length and the center of the rotor core is perpendicular to the magnet slot.

8. The motor according to any one of claims 1-5, characterized in that, The magnet slot includes a first slot and a second slot, the first slot and the second slot are at an angle to each other, and the first slot and the second slot are inclined in a direction away from each other in a direction away from the axis of the rotor core.

9. The motor according to claim 8, characterized in that, The first slot and the second slot are spaced apart or connected in the direction close to the axis of the rotor core.

10. The motor according to any one of claims 1-5, characterized in that, In a cross-section perpendicular to the axial direction of the rotor core, the magnet slot includes a first slot, a second slot, and a third slot. The line connecting the midpoint of the second slot along its length and the center of the rotor core is perpendicular to the second slot. The first slot and the third slot are located on the side of the second slot away from the rotor core axis. In the direction away from the rotor core axis, the first slot and the third slot are inclined in a direction away from each other.

11. The motor according to claim 10, characterized in that, The end of the first slot near the rotor core axis and the end of the third slot near the rotor core axis are located at opposite ends of the length direction of the second slot.

12. The motor according to claim 11, characterized in that, The end of the first slot near the rotor core axis and the end of the third slot near the rotor core axis are respectively located at the two ends of the second slot along its length direction and are connected or spaced apart.

13. The motor according to claim 1, characterized in that, The magnet slot extends through the rotor core along the axial direction of the rotor core.

14. A compressor, characterized in that, Includes the motor according to any one of claims 1-13.

15. A refrigeration device, characterized in that, Includes the compressor according to claim 14.

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