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 rotor and a stator, the stator comprises a stator iron core, the stator iron core comprises a stator yoke, a plurality of stator teeth and a plurality of tooth shoe parts, the tooth shoe parts are connected with one ends of the stator teeth departing from the stator yoke, and the rotor is connected with the stator yoke. A plurality of tooth shoe parts are arranged on the stator core, the plurality of tooth shoe parts enclose to form a mounting hole, the mounting hole is used for mounting the rotor, the diameter of the mounting hole is D1, the outer diameter of the stator core is D2, the number of the stator teeth is Q, and the width of the stator teeth is T. According to the technical scheme provided by the utility model, the power density of the motor 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] With the development of the modern economy, people have increasingly higher requirements for the cost, noise, and energy efficiency of air conditioners. This also places higher demands on the compressor, the core component of air conditioners. Therefore, the air compressor industry is currently developing towards miniaturization and lightweight design. Permanent magnet motors have advantages such as high efficiency, high power density, and low noise, and are widely used in various fields. However, the magnetic field of a permanent magnet motor is easily affected by external interference, such as temperature and electromagnetic fields, leading to magnetic circuit saturation and a decrease in magnetic flux. This affects the motor's high-frequency overload capacity, requiring increased cost and larger size to address the burn-in problem. Therefore, higher requirements are placed on the size constraints of the motor inside the compressor, i.e., the design of a high-power-density motor.

[0003] Generally, increasing the power density of a motor involves two approaches: increasing the rotational speed and increasing the torque density. For increasing torque density, a motor of the same volume will experience increased current and a stronger armature magnetic field. Therefore, appropriately adjusting the motor's base thickness and cross-sectional area, and selecting suitable slot-pole combinations are key issues we need to focus on. Utility Model Content

[0004] The main purpose of this invention is to provide an electric motor, compressor, and refrigeration equipment, which aims to improve the power density of the electric motor.

[0005] To achieve the above objectives, the motor proposed in this utility model includes:

[0006] Rotor;

[0007] The stator includes a stator core, which comprises a stator yoke, multiple stator teeth, and multiple tooth shoe portions. The tooth shoe portions are connected to the ends of the stator teeth facing away from the stator yoke. The multiple tooth shoe portions enclose and form mounting holes for mounting the rotor. The diameter of the mounting hole is D1, the outer diameter of the stator core is D2, the number of stator teeth is Q, and the width of the stator teeth is T.

[0008] In one embodiment, the stator further includes a stator winding, two adjacent stator teeth and the stator yoke enclose a stator slot, and the stator winding is wound around the stator teeth and located within the stator slot.

[0009] In one embodiment, the motor is a three-phase motor, the stator core has an axial height of L, the number of turns of the stator winding corresponding to each stator tooth is Ns, and the number of parallel branches of the stator winding is a.

[0010] In one embodiment, the stator winding is wound onto the stator teeth by a wire winding method; or the stator winding is wound onto the stator teeth by a wire embedding method.

[0011] In one implementation, Q ≥ 15.

[0012] In one embodiment, the number of poles of the motor is 2P, and Q / 2P < 3.

[0013] In one embodiment, the rotor includes a rotor core and a permanent magnet. The rotor core has a magnet slot, and the permanent magnet is located in the magnet slot. The thickness of the permanent magnet is t, where 1mm ≤ t ≤ 2.5mm.

[0014] In one embodiment, the rotor core is provided with a shaft hole and a plurality of flow holes, and the plurality of flow holes are spaced apart and arranged around the outer periphery of the shaft hole.

[0015] This utility model also proposes a compressor, including the motor described above.

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

[0017] The motor in this utility model includes a rotor and a stator. The stator includes a stator core, which in turn includes a stator yoke, multiple stator teeth, and multiple tooth shoe portions. The stator teeth are spaced apart on the inner circumferential surface of the stator yoke. Each tooth shoe portion is connected to one end of a stator tooth away from the stator yoke, with one tooth corresponding to one tooth shoe portion. The multiple tooth shoe portions enclose a mounting hole for mounting the rotor. The minimum inner diameter of the stator core is D1, the maximum outer diameter is D2, the number of stator teeth is Q, and the width of each stator tooth is T. Here, D1 / D2 represents the ratio of the minimum inner diameter to the maximum outer diameter of the stator core. Increasing the ratio of D1 / D2 will reduce the base thickness accordingly. A thinner base thickness may be beneficial to improving electromagnetic performance, but it may sacrifice some mechanical strength. Conversely, decreasing the ratio of D1 / D2 will increase the base thickness of the motor. A thicker base thickness can provide better mechanical strength and heat dissipation performance, but it will also increase the weight and cost of the motor. With D2 unchanged, increasing D1 will cause the stator yoke to become thinner along the radial direction of the stator core, thereby increasing the magnetic field density of the stator yoke. However, if the stator yoke is too thin, it is easy to cause local saturation of the stator yoke magnetic field, which will reduce the motor efficiency and increase iron loss. With D2 unchanged, decreasing D1 will make the stator of the motor thicker and heavier. Although it can reduce the magnetic field density of the stator yoke, it will significantly increase the size and weight of the motor, thereby reducing the power density. T×Q represents the sum of the widths of all stator teeth. The TQ value reflects the electromagnetic load and heat dissipation area of ​​the stator core. An excessively large TQ increases the complexity and manufacturing cost of the motor, and may also lead to improper slot-pole matching, thus increasing noise and vibration. Conversely, an excessively small TQ may fail to meet the motor's electromagnetic load and heat dissipation requirements, resulting in insufficient torque output and reduced efficiency. Therefore, by… By limiting the range, the base thickness, crack ratio, and appropriate slot-pole matching of the motor can be reasonably adjusted, thereby reducing local over-saturation of the electromagnetic magnetic field and improving the power density and efficiency of the motor. Attached Figure Description

[0018] 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.

[0019] Figure 1 A schematic diagram of the structure of an embodiment of the motor provided by this utility model;

[0020] Figure 2 for Figure 1 Side view.

[0021] Explanation of icon numbers:

[0022] 10. Stator core; 11. Stator yoke; 12. Stator teeth; 13. Tooth shoe; 14. Stator slot; 21. Rotor core; 211. Shaft hole; 212. Flow hole; 22. Permanent magnet.

[0023] 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

[0024] 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.

[0025] 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.

[0026] 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.

[0027] Reference Figure 1 This utility model proposes an electric motor, comprising:

[0028] Rotor;

[0029] The stator includes a stator core 10, which includes a stator yoke 11, a plurality of stator teeth 12, and a plurality of tooth shoe portions 13. Each tooth shoe portion 13 is connected to one end of a stator tooth 12 opposite to the stator yoke 11. The plurality of tooth shoe portions 13 enclose a mounting hole for mounting the rotor. The diameter of the mounting hole is D1, the outer diameter of the stator core 10 is D2, the number of stator teeth 12 is Q, and the width of each stator tooth 12 is T.

[0030] The motor in this utility model includes a rotor and a stator. The stator includes a stator core 10, which includes a stator yoke 11, multiple stator teeth 12, and multiple tooth shoe portions 13. The multiple stator teeth 12 are spaced apart on the inner circumferential surface of the stator yoke 11. The tooth shoe portions 13 are connected to the ends of the stator teeth 12 that are away from the stator yoke 11, with one tooth shoe portion 13 corresponding to one stator tooth 12. The multiple tooth shoe portions 13 enclose and form a mounting hole for mounting the rotor. The minimum inner diameter of the stator core 10 is D1, the maximum outer diameter of the stator core 10 is D2, the number of stator teeth 12 is Q, and the width of the stator teeth 12 is T. Wherein, D1 / D2 represents the ratio of the minimum inner diameter to the maximum outer diameter of the stator core 10. Increasing the ratio of D1 / D2 will correspondingly reduce the base thickness, and a thinner base thickness may be beneficial to the improvement of electromagnetic performance, but may sacrifice some mechanical strength. Conversely, decreasing the ratio of D1 / D2 will increase the base thickness of the motor, and a thicker base thickness can provide better mechanical strength and heat dissipation performance, but will also increase the weight and cost of the motor. With D2 unchanged, increasing D1 will cause the stator yoke 11 to become thinner in the radial direction of the stator core 10, thereby increasing the magnetic field density of the stator yoke 11. However, if the stator yoke 11 is too thin, it is easy to cause local saturation of the magnetic field of the stator yoke 11, thereby reducing the motor efficiency and increasing iron loss. With D2 unchanged, decreasing D1 will make the stator of the motor thicker and heavier. Although it can reduce the magnetic field density of the stator yoke 11, it will significantly increase the volume and weight of the motor, thereby reducing the power density. T×Q represents the sum of the widths of all stator teeth 12. The TQ value reflects the electromagnetic load and heat dissipation area of ​​the stator core 10. An excessively large TQ increases the complexity and manufacturing cost of the motor, and may also lead to improper slot-pole matching, thereby increasing noise and vibration. Conversely, an excessively small TQ may fail to meet the electromagnetic load and heat dissipation requirements of the motor, resulting in insufficient torque output and reduced efficiency. Therefore, through… By limiting the range, the base thickness, crack ratio, and appropriate slot-pole matching of the motor can be reasonably adjusted, thereby reducing local over-saturation of the electromagnetic magnetic field and improving the power density and efficiency of the motor.

[0031] In one embodiment, the stator further includes a stator winding. Two adjacent stator teeth 12 and the stator yoke 11 enclose a stator slot 14. The stator winding is wound around the stator teeth 12 and located within the stator slot 14. The stator winding is wound around the stator teeth 12 by a wire winding method. The wire winding method is usually more direct and does not require complex processes and equipment, thus it is easy to implement, thereby reducing the processing difficulty of the stator and reducing the production cost of the stator. At the same time, the wire winding method is relatively simple, and maintenance and replacement are relatively easy when the winding fails.

[0032] In another embodiment, the stator winding is wound onto the stator teeth 12 using a wire-embedding method. This wire-embedding method utilizes the space of the stator slots 14 more effectively, increasing the slot fill factor and thus increasing the conductive area of ​​the winding, thereby improving motor performance. Simultaneously, the wire-embedding method better disperses the heat generated by the winding, improving the motor's heat dissipation performance and extending its service life. Furthermore, through careful design and wire-embedding processes, the wire-embedding method can optimize the motor's electromagnetic performance, improving its output power and efficiency.

[0033] Reference Figure 1 and Figure 2 Specifically, the motor is a three-phase motor, the stator core 10 has an axial height of L, the number of turns of the stator winding corresponding to each stator tooth 12 is Ns, and the number of parallel branches of the stator winding is a. Among them, L is related to the overall size and structure of the motor; a affects the current distribution and electromagnetic performance of the motor; Ns is related to the electromagnetic induction and output voltage of the motor. Therefore, if This means the stator core 10 is taller or has more parallel branches, but relatively fewer turns. This can lead to problems such as complex motor structure, difficulty in heat dissipation, and uneven current distribution. Furthermore, a taller stator core 10 and more parallel branches increase manufacturing costs and process complexity. Conversely, too few turns in the stator windings result in insufficient electromagnetic induction capability of the motor, thus reducing the stability of the output voltage. And if... This means a lower stator core 10 or fewer parallel branches, but a higher number of turns. This can lead to problems such as limited motor output power and poor electromagnetic performance. At the same time, a lower stator core 10 and fewer parallel branches limit the compactness and lightweight design of the motor. Finally, too many turns result in excessive winding resistance and inductance, leading to increased energy consumption and reduced efficiency. Therefore, proper setting... This allows for the optimization of the motor's electromagnetic performance, heat dissipation performance, and output power while ensuring a compact motor structure and controllable manufacturing costs. It also helps to achieve uniform current distribution and optimized electromagnetic induction, thereby improving the motor's efficiency and stability, and reducing the stator's manufacturing costs.

[0034] Furthermore, Q ≥ 15. Increasing the number of stator teeth 12 improves the stability of the motor during operation, reduces vibration and noise, thereby reducing energy consumption and improving energy efficiency. Simultaneously, more stator teeth 12 provide a larger heat dissipation area, aiding in heat dissipation during long-term operation and extending motor life. Furthermore, a higher number of stator teeth 12 allows for more electromagnetic poles, enabling the motor to more flexibly adapt to different load and speed requirements. Finally, optimizing the tooth ratio helps improve the motor's torque and speed, thus enhancing overall performance.

[0035] In one embodiment, the motor has 2P poles, and Q / 2P < 3. By controlling the Q / 2P ratio, the distribution of the electromagnetic field can be optimized, improving the efficiency and performance of the motor. A smaller Q / 2P ratio means that for the same number of poles, the number of stator teeth 12 is relatively small, which helps to reduce the complexity of the electromagnetic field and harmonic components, thereby reducing motor losses and noise. Too many stator teeth 12 may increase the complexity and manufacturing cost of the stator core 10, and may also have an adverse effect on the stability of the mechanical structure. By controlling the Q / 2P ratio to be less than 3, the mechanical structure can be simplified while ensuring motor performance, improving the reliability and durability of the motor. At the same time, the optimized electromagnetic design can reduce motor losses and improve energy utilization efficiency; the fewer stator teeth 12 help to reduce eddy current losses and hysteresis losses in the core, thereby improving the overall efficiency of the motor.

[0036] In one embodiment, the rotor includes a rotor core 21 and a permanent magnet 22. The rotor core 21 has magnet slots, and the permanent magnet 22 is located within these slots. The thickness of the permanent magnet 22 is t, where 1mm ≤ t ≤ 2.5mm. A thickness between 1mm and 2.5mm helps optimize the magnetic field distribution, making the magnetic field more uniform in the air gap, thereby improving the motor's torque output and efficiency. Within this thickness range, the permanent magnet 22 can generate sufficient magnetic flux to meet the motor's operating requirements while avoiding magnetic saturation caused by excessive magnetic field concentration. Furthermore, an appropriate thickness of the permanent magnet 22 can increase the motor's power density and torque density, enabling the motor to output greater power and torque with a smaller size and weight. This helps improve the motor's dynamic response speed and operational stability, meeting the needs of various application scenarios. Furthermore, by optimizing the thickness of the permanent magnet 22, iron and copper losses in the motor can be reduced, thereby lowering energy consumption and improving energy efficiency. A thinner permanent magnet 22 helps reduce eddy current and hysteresis losses, while an appropriate thickness minimizes energy consumption while maintaining performance. Within this thickness range, the permanent magnet 22 is not too dense, which is beneficial for heat dissipation and the formation of heat dissipation channels; this helps maintain stable motor temperature during operation and extends the motor's service life. The permanent magnet 22 can be made of neodymium iron boron, samarium cobalt, alnico, ferrite magnets, etc.

[0037] The stator core 10 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 and rotor laminations, only multiple stator or rotor laminations need to be processed when machining the stator core 10 and rotor core 21. The multiple stator and rotor lamination parts are then assembled into the stator core 10 and rotor core 21. Compared with machining a complete stator core 10 and rotor core 21, the difficulty of machining stator and rotor lamination parts is reduced, which facilitates the automated production of the stator core 10 and rotor core 21 through automated production lines, thereby reducing production costs.

[0038] In one embodiment, the rotor core 21 and the stator core 10 can be made of different materials or have different shapes, thereby meeting the requirements of different processing techniques for the stator and rotor. This facilitates the selection of appropriate laminations to form the rotor core 21 and stator core 10 according to the performance requirements of the motor, thus ensuring good electrode performance and expanding the applicability of the motor. In another embodiment, the stator laminations stacked to form the stator core 10 are the same as the rotor laminations stacked to form the rotor core 21, which facilitates mass production of laminations and reduces manufacturing costs.

[0039] In one embodiment, the rotor core 21 is provided with a shaft hole 211 and a plurality of flow holes 212, with the plurality of flow holes 212 spaced apart and arranged around the outer periphery of the shaft hole 211. The shaft hole 211 is used to install a drive shaft, thereby driving the drive components to rotate. After the motor 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 212 on the rotor core 21, and having a coolant flowing through the flow holes 212, the temperature of the rotor core 21 can be reduced by the coolant, thereby maintaining the permanent magnet 22 within the optimal range and thus improving the performance of the motor.

[0040] This utility model also proposes a compressor, which includes a motor. The specific structure of the motor is as described in the above embodiments. Since this 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.

[0041] 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, compressor, electronic expansion valve, evaporator, 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.

[0042] 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: Rotor; The stator includes a stator core, which comprises a stator yoke, multiple stator teeth, and multiple tooth shoe portions. The tooth shoe portions are connected to the ends of the stator teeth facing away from the stator yoke. The multiple tooth shoe portions enclose and form mounting holes for mounting the rotor. The diameter of the mounting hole is D1, the outer diameter of the stator core is D2, the number of stator teeth is Q, and the width of the stator teeth is T.

2. The motor as described in claim 1, characterized in that, The stator also includes a stator winding, with two adjacent stator teeth and the stator yoke forming a stator slot, and the stator winding is wound around the stator teeth and located within the stator slot.

3. The motor as described in claim 2, characterized in that, The motor is a three-phase motor. The height of the stator core along the axial direction is L. The number of turns of the stator winding corresponding to each stator tooth is Ns. The number of parallel branches of the stator winding is a.

4. The motor as described in claim 2, characterized in that, The stator winding is wound on the stator teeth by a wire winding method; or the stator winding is wound on the stator teeth by a wire embedding method.

5. The motor as described in claim 1, characterized in that, Q≥15。 6. The motor as described in claim 1, characterized in that, The motor has 2P poles, and Q / 2P < 3.

7. The motor as described in claim 1, characterized in that, The rotor includes a rotor core and a permanent magnet. The rotor core has a magnet slot, and the permanent magnet is located in the magnet slot. The thickness of the permanent magnet is t, where 1mm≤t≤2.5mm.

8. The motor as described in claim 7, characterized in that, The rotor core is provided with a shaft hole and multiple flow holes, and the multiple flow holes are spaced around the outer periphery of the shaft hole.

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.

Images