Motor, compressor and refrigeration equipment

Abstract

The utility model discloses a motor, compressor and refrigeration equipment, relates to refrigeration equipment technical field, the motor comprises a stator and a rotor, the stator comprises a stator iron core and a winding, the stator iron core is provided with stator slots, the winding is wound on the stator slots, the number of the stator slots is 12; the number of poles of the rotor is eight, the rotor comprises a rotor iron core and permanent magnets, the rotor iron core is provided with a plurality of permanent magnet grooves and at least one set of first magnetic isolation grooves, the first magnetic isolation grooves are located in the sides, close to the outer periphery of the rotor iron core, of the permanent magnet grooves, and the first magnetic isolation grooves of each set of first magnetic isolation grooves are symmetrically arranged along the perpendicular bisector of a second permanent magnet. The shortest distance between any two symmetrically-arranged first magnetic isolation grooves in each group of first magnetic isolation grooves is B1, the length of the second permanent magnet is B2, and B1 / B2 is larger than or equal to 0.9 and smaller than or equal to 1.2. According to the technical scheme provided by the utility model, the motor efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of refrigeration equipment, and in particular to a motor, compressor and refrigeration equipment. Background Technology

[0002] Permanent magnet motors are widely used in various industries due to their high efficiency and high power density. However, with rising living standards and increasing demands for energy conservation and emission reduction, the requirements for motor efficiency are becoming increasingly stringent. Currently, the efficiency of permanent magnet motors has reached a bottleneck, and it is difficult to further improve the efficiency of 12-slot, 8-pole motors through conventional methods. Utility Model Content

[0003] The main purpose of this invention is to provide a motor, compressor, and refrigeration equipment, which aims to improve motor efficiency.

[0004] To achieve the above objectives, the motor proposed in this utility model includes:

[0005] The stator includes a stator core and windings. The stator core has stator slots, and the windings are wound around the stator slots. The number of stator slots is 12.

[0006] A rotor, the rotor having 8 poles, the rotor comprising:

[0007] The rotor core has multiple permanent magnet slots and at least one set of first magnetic isolation slots. The first magnetic isolation slots are located on the side of the permanent magnet slots near the outer periphery of the rotor core. Each set of first magnetic isolation slots includes multiple first magnetic isolation slots.

[0008] The permanent magnet includes a first permanent magnet, a second permanent magnet, and a third permanent magnet. The first permanent magnet, the second permanent magnet, and the third permanent magnet are all located in the permanent magnet slots. The plurality of first magnetic isolation slots in each group are symmetrically arranged along the perpendicular bisector of the second permanent magnet. The shortest distance between any two first magnetic isolation slots symmetrically arranged in each group is B1. The length of the second permanent magnet is B2, and 0.9≤B1 / B2≤1.2.

[0009] In one embodiment, the rotor core further includes at least one set of second magnetic isolation slots. The second magnetic isolation slots are located on the side of the permanent magnet slots near the outer periphery of the rotor core. Each set of second magnetic isolation slots includes multiple second magnetic isolation slots. The multiple second magnetic isolation slots in each set are symmetrically arranged along the perpendicular bisector of the second permanent magnet, and the second magnetic isolation slots are located on the side of the first magnetic isolation slots away from the perpendicular bisector of the second permanent magnet. The maximum circumferential angle corresponding to each set of second magnetic isolation slots is A1, and the maximum circumferential angle corresponding to the first permanent magnet and the third permanent magnet in the same permanent magnet is A2, where 0.7≤A1 / A2≤0.8.

[0010] In one embodiment, the angle between the first permanent magnet of one of the permanent magnets and the third permanent magnet of its adjacent permanent magnet is C, where 45°≤C≤70°.

[0011] In one embodiment, the shortest distance between the first permanent magnet or the third permanent magnet and the outer peripheral wall of the rotor core is d, and the outer diameter of the rotor core is D, where 0.7≤d / D≤0.8.

[0012] In one embodiment, a first reference line is defined as the shortest distance line between the first permanent magnet and the third permanent magnet of the same permanent magnet facing each other to one side, and a second reference line is defined as the shortest distance line between the first permanent magnet and the third permanent magnet of the same permanent magnet facing away from each other to one side, wherein the second permanent magnet is at least partially located between the first reference line and the second reference line.

[0013] In one embodiment, the shortest distance line between the first permanent magnet and the third permanent magnet, which share the same permanent magnet, facing each other to one side is defined as a first reference line, and the second permanent magnet is located on the side of the first reference line close to the outer peripheral wall of the rotor core.

[0014] In one embodiment, the shortest distance line between the first permanent magnet and the third permanent magnet of the same permanent magnet on opposite sides is defined as the second reference line, and the second permanent magnet is located on the side of the second reference line away from the outer peripheral wall of the rotor core.

[0015] In one embodiment, the rotor core is provided with flow passage holes.

[0016] This utility model also proposes a compressor, including the motor described above.

[0017] This utility model also proposes a refrigeration device, including the compressor described above.

[0018] The technical solution of this utility model is mainly aimed at improving a motor with 12 stator slots and 8 rotor poles. Specifically, multiple first magnetic isolation slots are arranged on the side of the permanent magnet slots of the rotor core near the outer periphery. Each group of first magnetic isolation slots is symmetrically arranged along the perpendicular bisector of the second permanent magnet. The shortest distance between any two symmetrically arranged first magnetic isolation slots in each group is B1, and the length of the second permanent magnet is B2. By maintaining a range of 0.9 ≤ B1 / B2 ≤ 1.2, the magnetic circuit structure of the motor is optimized. This reduces the closed magnetic flux formed between adjacent permanent magnets through the inner surface of the rotor, and reduces the magnetic flux flowing directly inside the rotor without passing through the stator. This effectively hinders armature reaction, reduces armature iron loss, and thus improves motor efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the structure of an embodiment of the motor provided by this utility model;

[0021] Figure 2 for Figure 1 A schematic diagram of the structure of the first embodiment of the central rotor;

[0022] Figure 3 for Figure 1 Schematic diagram of the structure of the second embodiment of the central rotor;

[0023] Figure 4 for Figure 1 Schematic diagram of the structure of the third embodiment of the central rotor;

[0024] Figure 5 A schematic diagram of the compressor provided by this utility model;

[0025] Figure 6 A schematic diagram illustrating the variation of motor efficiency under different B1 / B2 conditions provided by this utility model;

[0026] Figure 7 A schematic diagram illustrating the variation of compressor COP under different SEERs for the motor provided by this utility model.

[0027] Explanation of icon numbers:

[0028] 1. Motor; 11. Stator core; 111. Stator slot; 21. Rotor core; 211. Permanent magnet slot; 212. First magnetic isolation slot; 213. Second magnetic isolation slot; 214. Flow hole; 22. Permanent magnet; 22a. First permanent magnet; 22b. Second permanent magnet; 22c. Third permanent magnet; X. First reference line; Y. Second reference line.

[0029] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0031] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0033] Reference Figure 1 , Figure 2 , Figure 6 as well as Figure 7 This utility model proposes a motor 1, comprising:

[0034] The stator includes a stator core 11 and a winding. The stator core 11 is provided with stator slots 111, and the winding is wound on the stator slots 111. The number of slots in the stator slots 111 is 12.

[0035] A rotor, the rotor having 8 poles, the rotor comprising:

[0036] The rotor core 21 is provided with a plurality of permanent magnet slots 211 and at least one set of first magnetic isolation slots 212. The first magnetic isolation slots 212 are located on the side of the permanent magnet slots 211 close to the outer periphery of the rotor core 21. Each set of first magnetic isolation slots 212 includes a plurality of first magnetic isolation slots 212.

[0037] The permanent magnet 22 includes a first permanent magnet 22a, a second permanent magnet 22b, and a third permanent magnet 22c. The first permanent magnet 22a, the second permanent magnet 22b, and the third permanent magnet 22c are all located in the permanent magnet slot 211. The plurality of first magnetic isolation slots 212 in each group are symmetrically arranged along the perpendicular bisector of the second permanent magnet 22b. The shortest distance between any two first magnetic isolation slots 212 symmetrically arranged in each group is B1. The length of the second permanent magnet 22b is B2, and 0.9≤B1 / B2≤1.2.

[0038] The technical solution of this utility model is mainly to improve a motor 1 with 12 stator slots 111 and 8 rotor poles. Specifically, multiple first magnetic isolation slots 212 are arranged on the side of the permanent magnet slots 211 of the rotor core 21 near the outer periphery. Each group of multiple first magnetic isolation slots 212 is symmetrically arranged along the perpendicular bisector of the second permanent magnet 22b. The shortest distance between any two symmetrically arranged first magnetic isolation slots 212 in each group is B1, and the length of the second permanent magnet 22b is B2. By keeping the distance within the range of 0.9 ≤ B1 / B2 ≤ 1.2, the magnetic circuit structure of the motor 1 is optimized. This reduces the closed magnetic flux formed between adjacent permanent magnets 22 through the inner surface of the rotor, reducing the magnetic flux flowing directly inside the rotor without passing through the stator. This effectively hinders armature reaction, reduces armature iron loss, and thus improves the efficiency of the motor 1.

[0039] If B1 / B2 > 1.2, it indicates that the magnetic isolation space between adjacent permanent magnets 22 is relatively large, which may lead to a more uneven magnetic circuit distribution. This unevenness may affect the output performance and efficiency of motor 1. If B1 / B2 < 0.9, it indicates that the magnetic isolation space between adjacent permanent magnets 22 may not be sufficient to effectively weaken the magnetic flux exchange between them, which may lead to increased armature reaction, thereby increasing iron loss and reducing the efficiency of motor 1. Furthermore, by limiting the range to 0.9 ≤ B1 / B2 ≤ 1.2, this relatively large range reduces the manufacturing precision requirements of rotor core 21 and permanent magnets 22, thereby reducing the manufacturing difficulty of rotor core 21 and permanent magnets 22, and ultimately reducing the manufacturing cost of rotor core 21 and permanent magnets 22.

[0040] Furthermore, the rotor core 21 also includes at least one set of second magnetic isolation slots 213. The second magnetic isolation slots 213 are located on the side of the permanent magnet slots 211 near the outer periphery of the rotor core 21. Each set of second magnetic isolation slots 213 includes multiple second magnetic isolation slots 213. These multiple second magnetic isolation slots 213 are symmetrically arranged along the perpendicular bisector of the second permanent magnet 22b, and the second magnetic isolation slots 213 are located on the side of the first magnetic isolation slot 212 away from the perpendicular bisector of the second permanent magnet 22b. The maximum circumferential angle corresponding to each set of second magnetic isolation slots 213 is A1, and the maximum circumferential angle corresponding to the first permanent magnet 22a and the third permanent magnet 22c in the same permanent magnet 22 is A2, where 0.7 ≤ A1 / A2 ≤ 0.8. By reasonably adjusting the ratio of A1 and A2, the magnetic field distribution can be optimized, unnecessary harmonic components reduced, thereby reducing iron loss. This means that the energy loss of the motor 1 is reduced during operation, thus improving the efficiency of the motor 1.

[0041] If A1 / A2 > 0.8, it means that the circumferential angle of the second magnetic isolation slot 213 relative to the permanent magnet 22 is too large, which may cause the magnetic field distribution on the outer periphery of the rotor core 21 to become uneven. This uneven magnetic field distribution will increase the magnetic reluctance and leakage flux of the motor 1, reducing the output power and efficiency of the motor 1. At the same time, an excessively large A1 / A2 may also increase the noise and vibration of the motor 1. If A1 / A2 < 0.7, it means that the circumferential angle of the second magnetic isolation slot 213 relative to the permanent magnet 22 is too small, which may cause the magnetic field distribution inside the rotor core 21 to become too concentrated. This concentrated magnetic field distribution will increase the local magnetic saturation of the motor 1, leading to increased iron loss and increased temperature of the motor 1, thereby reducing the efficiency of the motor 1. At the same time, an excessively small A1 / A2 may also limit the speed regulation range and overload capacity of the motor 1. Meanwhile, by limiting A1 / A2 to the range of 0.7 to 0.8, the manufacturing precision in the production process of the second magnetic isolation groove 213 is reduced, thereby reducing the manufacturing difficulty of the rotor core 21 and the permanent magnet 22, and thus reducing the manufacturing cost of the rotor core 21 and the permanent magnet 22.

[0042] Specifically, the angle C between the first permanent magnet 22a of a given permanent magnet 22 and the third permanent magnet 22c of its adjacent permanent magnet 22 is 45°≤C≤70°. If C<45°, it indicates that the angle C is too small, which means that the space between the adjacent permanent magnets 22 will become narrow, making it difficult to magnetize the permanent magnets 22, resulting in unsaturated magnetization and affecting the output power and efficiency of the motor 1. If C>70°, it indicates that the angle between the first permanent magnet 22a of a given permanent magnet 22 and the third permanent magnet 22c of its adjacent permanent magnet 22 will be too large, resulting in a smaller area of ​​the permanent magnet slot 211, which affects the amount of permanent magnets 22 used, reduces the power density of the motor 1, increases the energy loss of the motor 1 during operation, and increases energy consumption; this also leads to insufficient output power of the motor 1 and reduces the load on the motor 1. Therefore, by limiting the angle C to between 45° and 70°, the angle C is reasonably limited, thereby reducing the difficulty of magnetizing the permanent magnet 22 while meeting the requirements for the amount of permanent magnet 22, and thus improving the output power and efficiency of the motor 1.

[0043] Specifically, the shortest distance between the first permanent magnet 22a or the third permanent magnet 22c and the outer peripheral wall of the rotor core 21 is d, and the outer diameter of the rotor core 21 is D, where 0.7 ≤ d / D ≤ 0.8. If d / D < 0.7, the shortest distance between the first permanent magnet 22a or the third permanent magnet 22c and the outer peripheral wall of the rotor core 21 will be too small. This will make the area of ​​the first permanent magnet 22a or the third permanent magnet 22c near the outer periphery of the rotor core 21 susceptible to armature magnetic field harmonics, resulting in more eddy current losses and making the permanent magnet 22a more prone to demagnetization. Consequently, the magnetic field strength it generates will weaken, reducing the output power and torque of the motor 1 and affecting the normal operation of the entire system. If d / D > 0.8, the first permanent magnet 22a and the third permanent magnet 22c will be too far from the outer periphery of the rotor core 21, thus weakening the magnetic field of the permanent magnet 22, reducing the power density of the motor 1, increasing energy loss during operation, and thus increasing energy consumption; consequently, the output power of the motor 1 will be insufficient, reducing the load on the motor 1. Therefore, by reasonably setting the d / D ratio, the eddy current loss of the permanent magnet 22 can be reduced while ensuring that the output power and power density of the motor 1 meet the requirements, thereby reducing the demagnetization of the permanent magnet and improving the efficiency of the motor 1.

[0044] Reference Figure 2 In Embodiment 1, the shortest distance line between the first permanent magnet 22a and the third permanent magnet 22c of the same permanent magnet 22, which are oriented towards each other, is defined as the first reference line X. The shortest distance line between the first permanent magnet 22a and the third permanent magnet 22c, which are oriented away from each other, is defined as the second reference line Y. The second permanent magnet 22b is at least partially located between the first reference line X and the second reference line Y. This facilitates the production and processing of the slots 211 of the first permanent magnet 22a, the second permanent magnet 22b, and the third permanent magnet 22c, thereby reducing the manufacturing difficulty of the rotor core 21 and the manufacturing cost of the rotor core 21.

[0045] Reference Figure 3 In Embodiment Two, the shortest distance line between the first permanent magnet 22a and the third permanent magnet 22c, which are oriented towards each other on one side, is defined as the first reference line X. The second permanent magnet 22b is located on the side of the first reference line X closest to the outer peripheral wall of the rotor core 21. This makes the length of the slot 211 of the second permanent magnet 22b longer, allowing a larger second permanent magnet 22b to be placed in the slot 211, thereby increasing the magnetic flux of the permanent magnet 22 and improving the performance of the motor 1. At the same time, it also allows the rotor core 21 of the same volume to generate a larger magnetic field strength, which is also beneficial to the miniaturization of the rotor core 21 and the motor 1.

[0046] Reference Figure 4 In embodiment three, the shortest distance line between the first permanent magnet 22a and the third permanent magnet 22c on opposite sides of the same permanent magnet 22 is defined as the second reference line Y. The second permanent magnet 22b is located on the side of the second reference line Y away from the outer peripheral wall of the rotor core 21. This makes the length of the slot 211 of the second permanent magnet 22b longer, allowing a larger second permanent magnet 22b to be placed in the slot 211, thereby increasing the magnetic flux of the permanent magnet 22 and improving the performance of the motor 1. At the same time, it also allows the rotor core 21 of the same volume to generate a larger magnetic field strength, which is also beneficial to the miniaturization of the rotor core 21 and the motor 1.

[0047] The rotor core 21 is provided with a shaft hole and multiple flow holes 214, which are spaced apart and arranged around the outer periphery of the shaft hole. The shaft hole is used to install the drive shaft, thereby driving the drive components to rotate. After the motor 1 has been used for a long time, its temperature is prone to rise, which can easily lead to demagnetization of the permanent magnet 22, resulting in the permanent magnet 22 losing its magnetism or reducing its magnetism. Therefore, in this embodiment, by providing flow holes 214 on the rotor core 21, and having a coolant flowing through the flow holes 214, the temperature of the rotor core 21 can be reduced by the coolant, thereby maintaining the permanent magnet 22 within the optimal range and improving the performance of the motor 1.

[0048] Furthermore, the stator core 11 is composed of multiple stator laminations stacked sequentially, and the rotor core 21 is composed of multiple rotor laminations stacked sequentially. By setting multiple stator laminations and rotor laminations, only multiple stator laminations or rotor laminations need to be processed when machining the stator core 11 and rotor core 21. The multiple stator laminations and rotor laminations are then assembled into the stator core 11 and rotor core 21. Compared to machining a complete stator core 11 and rotor core 21, the difficulty of machining the stator laminations and rotor laminations is reduced, which facilitates the automated production of the stator core 11 and rotor core 21 through automated production lines, thereby reducing production costs.

[0049] Reference Figure 5 The present invention also proposes a compressor, which includes a motor 1. The specific structure of the motor 1 is as described in the above embodiments. Since the compressor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0050] This utility model also proposes a refrigeration device, which can be divided into compression refrigeration devices, absorption refrigeration devices, vapor jet refrigeration devices, heat pump refrigeration devices, and electric heating refrigeration devices, etc. The refrigeration device mainly includes a motor 1, a compressor, an electronic expansion valve, an evaporator, a condenser, accessories, and piping. Examples include refrigerators and air conditioners. The specific structure of the electronic expansion valve is as described in the above embodiments. Since the refrigeration device in this utility model adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here.

[0051] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An electric motor, characterized in that, include: The stator includes a stator core and windings. The stator core has stator slots, and the windings are wound around the stator slots. The number of stator slots is 12. A rotor, the rotor having 8 poles, the rotor comprising: The rotor core has multiple permanent magnet slots and at least one set of first magnetic isolation slots. The first magnetic isolation slots are located on the side of the permanent magnet slots near the outer periphery of the rotor core. Each set of first magnetic isolation slots includes multiple first magnetic isolation slots. The permanent magnet includes a first permanent magnet, a second permanent magnet, and a third permanent magnet. The first permanent magnet, the second permanent magnet, and the third permanent magnet are all located in the permanent magnet slots. The plurality of first magnetic isolation slots in each group are symmetrically arranged along the perpendicular bisector of the second permanent magnet. The shortest distance between any two first magnetic isolation slots symmetrically arranged in each group is B1. The length of the second permanent magnet is B2, and 0.9≤B1 / B2≤1.

2.

2. The motor as described in claim 1, characterized in that, The rotor core further includes at least one set of second magnetic isolation slots. The second magnetic isolation slots are located on the side of the permanent magnet slots near the outer periphery of the rotor core. Each set of second magnetic isolation slots includes multiple second magnetic isolation slots. The multiple second magnetic isolation slots in each set are symmetrically arranged along the perpendicular bisector of the second permanent magnet. The second magnetic isolation slots are located on the side of the first magnetic isolation slots away from the perpendicular bisector of the second permanent magnet. The maximum circumferential angle corresponding to each set of second magnetic isolation slots is A1. The maximum circumferential angle corresponding to the first permanent magnet and the third permanent magnet in the same permanent magnet is A2. 0.7≤A1 / A2≤0.

8.

3. The motor as described in claim 1, characterized in that, The angle between the first permanent magnet of the permanent magnet and the third permanent magnet of its adjacent permanent magnet is C, where 45°≤C≤70°.

4. The motor as described in claim 1, characterized in that, The shortest distance between the first permanent magnet or the third permanent magnet and the outer peripheral wall of the rotor core is d, and the outer diameter of the rotor core is D, where 0.7≤d / D≤0.

8.

5. The motor as described in claim 1, characterized in that, The shortest distance line between the first permanent magnet and the third permanent magnet of the same permanent magnet facing each other to one side is defined as the first reference line, and the shortest distance line between the first permanent magnet and the third permanent magnet of the same permanent magnet facing away from each other to one side is defined as the second reference line, wherein the second permanent magnet is at least partially located between the first reference line and the second reference line.

6. The motor as described in claim 1, characterized in that, The shortest distance line between the first permanent magnet and the third permanent magnet, which are the same permanent magnet, and facing each other to one side is defined as the first reference line. The second permanent magnet is located on the side of the first reference line close to the outer peripheral wall of the rotor core.

7. The motor as described in claim 1, characterized in that, The shortest distance line between the first permanent magnet and the third permanent magnet of the same permanent magnet on opposite sides is defined as the second reference line, and the second permanent magnet is located on the side of the second reference line away from the outer peripheral wall of the rotor core.

8. The motor as described in claim 1, characterized in that, The rotor core is provided with flow passage holes.

9. A compressor, characterized in that, Includes the motor as described in any one of claims 1 to 8.

10. A refrigeration device, characterized in that, Includes the compressor as described in claim 9.

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