Motor, compressor and refrigeration equipment

Abstract

The utility model discloses a motor, compressor and refrigeration equipment relates to motor technical field, the motor includes stator and rotor, the stator includes stator core and winding, the stator core includes stator yoke and a plurality of stator teeth, the stator yoke is annular setting, the minimum inner circle contour radius of stator core is R2, and the winding is the winding. The stator teeth are arranged at intervals along the circumferential direction of the inner ring surface of the stator yoke, so that a stator slot is formed between any two adjacent stator teeth, the winding is wound on the stator teeth, the number of the stator slots is Q, and the length of the stator slots is H; the rotor is rotatably arranged in the stator, the number of poles of the rotor is P, the largest common divisor of Q and P is X, and (H * X2-60X) / 2R2 is set to be larger than or equal to 0.4 and smaller than or equal to 1.3; according to the technical scheme provided by the utility model, the slot fullness rate can be improved, and the power density of the motor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and particularly to a motor, a compressor and a refrigeration device. Background Art

[0002] With the development of the motor manufacturing industry, many newly developed motors with independent innovation have emerged. As the market demand for motors with small size, high speed and high power density is increasing, higher requirements are put forward for the performance of motors. Therefore, in order to enhance the power density of motors, how to improve the slot fill factor of motors is a problem that needs to be considered in motor design. Summary of the Utility Model

[0003] The main object of the utility model is to propose a motor, aiming to improve the slot fill factor of the motor.

[0004] To achieve the above object, the motor proposed by the utility model includes:

[0005] A stator, the stator includes a stator core and a winding, the stator core includes a stator yoke and a plurality of stator teeth, the stator yoke is arranged in a ring shape, and the minimum inner circle contour radius of the stator core is R 2 , a plurality of the stator teeth are arranged at intervals along the circumferential direction of the inner ring surface of the stator yoke to form a stator slot between any two adjacent stator teeth, the winding is wound around the stator teeth, the number of slots of the stator slot is Q, and the slot length of the stator slot is H; and

[0006] A rotor, the rotor is rotatably arranged in the stator, the number of poles of the rotor is P, the greatest common divisor of Q and P is X, and it is set that 0.4 ≤ (H * X 2 - 60X) / 2R 2 ≤ 1.3.

[0007] In an embodiment, the diameter of the wire of the winding is D, a transition fillet is provided between the stator tooth and the stator yoke, and the radius of the transition fillet is R 1 , the R 1 ranges from: D / 2 ≤ R 1 ≤ D.

[0008] In an embodiment, 0.5 mm ≤ D ≤ 1 mm.

[0009] In an embodiment, the R 1 ranges from: 1 mm ≤ R 1 ≤ 3 mm.

[0010] In an embodiment, the R 2 ranges from 24 mm ≤ R 2 ≤ 57 mm.

[0011] In one embodiment, 13 mm ≤ H ≤ 15 mm.

[0012] In one embodiment, Q is 15.

[0013] In one embodiment, a groove is provided on the outer circumferential surface of the stator yoke.

[0014] In one embodiment, the groove includes a first groove section and a second groove section that communicate with each other. The width of the first groove section is smaller than the width of the second groove section, and the second groove section is disposed close to the outer circumferential surface of the stator yoke.

[0015] The present utility model also provides a compressor, including the above-described motor.

[0016] The present utility model also provides a refrigeration device, including the above-described compressor.

[0017] The technical solution of the present utility model reasonably selects the parameters of the inner diameter of the stator yoke, the number of stator slots, the slot length of the stator slots, and the number of poles of the rotor by using 0.4 ≤ (H * X 2 - 60X) / 2R 2 ≤ 1.3, so that the stator slots and the stator yoke cooperate with each other to achieve the effect of improving the slot filling factor of the motor, thereby improving the power density of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0019] Figure 1 FIG. is a schematic structural diagram of a stator of an embodiment of the motor provided by the present utility model;

[0020] Figure 2 is Figure 1 a partial enlarged view of part A in

[0021] Figure 3 FIG. is a schematic diagram showing the change of the power density of the motor provided by the present utility model with (H * X 2 - 60X) / 2R 2 ;

[0022] Explanation of the reference numerals in the drawings:

[0023] 100, Stator; 110, Stator core; 111, Stator yoke; 112, Stator teeth; 113, Stator slots; 114, Transition fillet; 115, Groove; 120, Winding.

[0024] The realization of the purpose, functional characteristics and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0026] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0028] Increasing the slot fill factor means that more windings 120 can be filled under the premise of unchanged space, generating a stronger magnetic field intensity, increasing the power density. Specifically, when the slot fill factor increases, the area occupied by the windings 120 increases, which may cause the length of the windings 120 of the stator 100 to become shorter, thereby reducing the resistance and losses, and improving the efficiency and power factor of the motor. At the same time, a high slot fill factor will reduce the voids in the windings 120 of the stator 100, improving the fitting degree of the stator 100 to the rotor, thereby increasing the output torque and power density of the motor. However, the slot fill factor is directly or indirectly affected by the minimum inner circle contour radius of the stator core 110, the number of stator slots 113, the slot length of the stator slots 113, and the number of poles of the rotor.

[0029] Among them, the minimum inner circle contour radius of the stator core determines the size of the stator 100, which will affect the geometry and size of the stator slots 113, thereby affecting the slot fill factor of the motor. The number of stator slots 113 will also affect the slot fill factor. When the number of stator slots 113 is relatively large, more space can be provided for arranging the windings 120, which may reduce the slot fill factor of a single slot because space needs to be left for the arrangement and heat dissipation of the windings 120. Although the slot length of the stator slots 113 is not a direct calculation factor for the slot fill factor, the slot length and cross-sectional area of the stator slots 113 jointly determine the slot volume, thereby affecting the slot fill factor. Furthermore, the number of poles of the motor will also affect the power density of the motor. As the number of poles of the motor increases, the torque of the motor will increase, but it does not necessarily mean that the power density of the motor will also increase. Because the power of the motor is ultimately determined by the product of current and voltage, and there is no direct mathematical relationship with the number of poles. However, an increase in the number of poles may cause an increase in the volume and weight of the motor, which will affect the power density of the motor to a certain extent. Therefore, in the design of the motor, it is necessary to reasonably select the inner diameter of the stator yoke 111, the number of stator slots 113, the slot length of the stator slots 113, and the number of poles of the rotor according to the specific performance requirements and design parameters of the motor to achieve an appropriate slot fill factor, thereby increasing the power density of the motor.

[0030] The present utility model provides a motor.

[0031] Referring to Figure n, in an embodiment of the present utility model, the motor includes a stator 100 and a rotor. The stator 100 includes a stator core 110 and windings 120. The stator core 110 includes a stator yoke 111 and a plurality of stator teeth 112. The stator yoke 111 is annularly arranged, and the minimum inner circle contour radius of the stator core 110 is R 2, a plurality of the stator teeth 112 are arranged at intervals in the circumferential direction of the inner ring surface of the stator yoke 111 to form stator slots 113 between any two adjacent stator teeth 112, the winding 120 is wound around the stator teeth 112, the number of slots of the stator slots 113 is Q, and the slot length of the stator slots 113 is H; the rotor is rotatably arranged in the stator 100, the number of poles of the rotor is P, and the greatest common divisor of the Q and the P is X, and 0.4 ≤ (H * X 2 - 60X) / 2R 2 ≤ 1.3.

[0032] According to the stator punching sheet provided by the present invention, it is creatively proposed to combine the minimum inner circle contour radius R 2 of the motor stator core 110 with the slot length H of the stator slot 113, so as to realize parametric research and propose a design formula for different ratio schemes under different minimum inner circle contour radii of the stator core 110 and slot lengths H of the stator slot 113. This formula can optimize the armature magnetic field and guide different scheme designs; it ensures that the power density of the product is within the optimal range.

[0033] The technical solution of the present invention rationally selects the parameters of the inner diameter of the stator yoke 111, the number of stator slots 113, the slot length of the stator slots 113, and the number of poles of the rotor through 0.4 ≤ (H * X 2 - 60X) / 2R 2 ≤ 1.3, so that the stator slots 113 and the stator yoke 111 cooperate with each other to achieve the effect of improving the slot filling rate of the motor, thereby improving the power density of the motor.

[0034] Referring to Figure 3 , Figure 3 is the schematic diagram of the change of (H * X 2 - 60X) / 2R 2 with the power density of the motor. Referring to Figure 3 it can be seen that when (H * X 2 - 60X) / 2R 2 is less than 0.8, as (H * X 2 - 60X) / 2R 2 increases, the power density of the motor also gradually increases. When (H * X 2 - 60X) / 2R 2 exceeds 0.8, as (H * X 2 - 60X) / 2R 2 increases, the power density of the motor gradually decreases. And when (H * X 2 - 60X) / 2R 2 is in the range of 0.4 to 1.3, the power density of the motor is 5900000 W / m 3 , that is, the power density of the motor reaches a relatively optimal value.

[0035] It should be noted that the slot length H of the stator slot 113 refers to the distance between the middle of the slot opening of the stator slot and the middle of the side wall of the stator slot opposite to the slot opening.

[0036] Among them, the stator core 110 is composed of a plurality of stacked stator laminations, and the stator laminations are made of silicon steel material. Among them, silicon steel refers to silicon alloy steel with a silicon content of 1.0% to 4.5% and a carbon content of less than 0.08%. Silicon steel has characteristics such as high magnetic permeability, low coercive force, and large resistivity coefficient, so both hysteresis loss and eddy current loss are relatively small.

[0037] The wire of the winding is, for example but not limited to, copper wire or aluminum wire; no specific restriction is made on the specific material of the wire here.

[0038] This is because copper wire has the following advantages: First, the conductivity of copper wire is high, and its conductivity is about 310 times that of pure mercury, 2 times that of pure aluminum, and even better than gold. Therefore, copper wire can conduct more current, and the loss of electric energy is low, and it is more energy-efficient. Second, the conductivity of copper wire is stable. Under normal temperature, humidity and other conditions, its resistivity and conductivity are relatively stable. Compared with other materials, the electrical properties of copper wire change less in high-temperature, humid and other environments. Third, the mechanical strength of copper wire is high. Compared with other metal conductor materials, the mechanical strength of copper wire is very high, and its tensile resistance, pressure resistance and other properties are better. This makes copper wire more reliable and durable in use. Fourth, copper wire is easy to process. The processing performance of copper wire is relatively good, and it can be produced into copper wires of different specifications by drawing, rolling and other methods. At the same time, in terms of welding, riveting and other technologies, the processing performance of copper wire is also relatively excellent.

[0039] Secondly, aluminum wire not only has good electrical conductivity and can effectively transmit electricity, but more importantly, the price of aluminum wire is low, which is beneficial to reducing the production cost of the motor.

[0040] Furthermore, the diameter of the wire of the winding 120 is D, a transition fillet 114 is provided between the stator tooth 112 and the stator yoke 111, and the radius of the transition fillet 114 is R 1 , the R 1 ranges from: D / 2 ≤ R 1 ≤ D. It can be understood that the radius R of the transition fillet 114 between the stator tooth 112 and the stator yoke 111 1 has a direct impact on whether the wire of the winding 120 can be adapted to the transition fillet 114, that is, it affects the degree to which the wire close to the transition fillet 114 fills the transition fillet 114. In this solution, the radius of the transition fillet 114 is R 1Restricting it between D / 2 and D can enable the wire to better fit the transition fillet 114, thereby improving the slot fill factor and further enhancing the power density of the motor.

[0041] Furthermore, 0.5mm ≤ D ≤ 1mm; it can be understood that the diameter of the wire of the winding 120 directly affects the filling degree of the wire in the stator slot 113. The larger the diameter of the wire of the winding 120, the larger the space occupied in the stator slot 112. With the same slot size, a larger wire diameter will result in a lower slot fill factor. Moreover, a thicker wire not only occupies a large space itself, but its insulation layer will also occupy a part of the slot space. A larger wire diameter may increase the difficulty of wire insertion, leading to an increase in labor and working hours, and may damage the insulation layer. This will also affect the setting and optimization of the slot fill factor to a certain extent. This solution restricts the diameter D of the wire of the winding 120 between 0.5mm and 1mm, which is beneficial to improving the slot fill factor, reducing the difficulty of wire insertion, enhancing the processing efficiency, and reducing the probability of damage to the wire of the winding 120.

[0042] In this embodiment, the diameter of the wire of the winding 120 is 0.65mm.

[0043] In one embodiment, the R 1 ranges from: 1mm ≤ R 1 ≤ 3mm. It can be understood that the design of the transition fillet 114 will affect the effective space of the stator slot 113. A larger transition fillet 114 may occupy more space, thus restricting the placement space of the winding 120 and further affecting the slot fill factor. Moreover, a reasonable design of the transition fillet 114 can improve the mechanical strength of the stator 100, reduce stress concentration, and thus improve the durability of the motor. This solution restricts the radius of the transition fillet 114 between 1mm and 3mm, which can improve the mechanical strength of the stator 100, reduce stress concentration, improve the slot fill factor, and thus improve the power density of the motor. If the radius R 1 of the transition fillet 114 is less than 1mm, stress concentration will occur at the connection between the stator tooth 112 and the stator yoke 111. This stress concentration may cause material fatigue in the local area, thereby reducing the durability and life of the motor. If the radius R 1 of the transition fillet 114 is greater than 3mm, although it can reduce the stress concentration at the connection between the stator tooth 112 and the stator yoke 111, it will occupy the effective space of the stator slot 113 to a certain extent. This may lead to a reduction in the actual slot space available for placing the winding 120, indirectly affecting the slot fill factor.

[0044] In this embodiment, the radius R 1 of the transition fillet 114 is 2mm.

[0045] Optionally, the R 2 ranges from 24mm ≤ R2 ≤57 mm. It can be understood that increasing the inner crack ratio (the ratio of the inner diameter to the outer diameter of the stator 100) will improve the efficiency of the motor. This means that, while keeping the number of stator teeth 112 and magnetic poles unchanged, increasing the minimum inner circular contour radius of the stator core 110 will increase the rotor magnetic pole area, and more magnetic flux will pass through the stator teeth 112 and yoke, thereby improving the efficiency of the motor. However, increasing the minimum inner circular contour radius of the stator core 110 will lead to an increase in the overall size of the stator 100, which may increase the manufacturing difficulty and cost. By limiting the inner diameter of the stator yoke 111 between 24 mm and 57 mm, this solution is beneficial to reducing the production cost while improving the motor efficiency.

[0046] Since the torque output ability has a certain relationship with the minimum inner circular contour radius of the stator core 110, too small an inner diameter may lead to insufficient torque. If the minimum inner circular contour radius of the stator core (110) is less than 24 mm, it will not only limit the torque output ability of the motor, but also reduce the overall efficiency of the motor. If the minimum inner circular contour radius of the stator core 110 is greater than 57 mm, it will cause a significant increase in the cost of the motor.

[0047] In this embodiment, the minimum inner circular contour radius R of the stator core 110 2 is 57 mm.

[0048] In one embodiment, 13 mm ≤ H ≤ 15 mm; by limiting the length H of the stator slot 113 between 13 mm and 15 mm, this solution is beneficial to adjusting the magnetic field distribution, thereby improving the motor efficiency.

[0049] If the length H of the stator slot 113 is less than 13 mm, it may lead to uneven magnetic field distribution in the stator teeth 112 and yoke. This uneven magnetic field distribution will affect the peak value of the magnetic flux density, thereby causing a decline in the motor performance. If the length H of the stator slot 113 is greater than 15 mm, it will not only cause a reduction in the effective magnetic flux area of the stator teeth 112, thereby reducing the magnetic flux passing through the stator 100. This will affect the magnetic energy conversion efficiency of the motor and lead to a reduction in the output power and efficiency of the motor. It will also make the stator teeth 112 more likely to reach the saturation state under high load, limiting the performance of the motor under high load.

[0050] In one embodiment, Q is 15. It can be understood that the number of slots of the stator slot 113 is inversely proportional to the motor speed. That is, the more the stator slots 113, the lower the motor speed; the fewer the stator slots 113, the higher the motor speed. Therefore, a 15-slot motor has higher speed characteristics compared to motors with more slots and is suitable for scenarios that require high-speed operation.

[0051] By increasing the number of stator slots 113, the space utilization rate of the motor winding can be improved, increasing the winding slot fill factor, which helps to improve the efficiency and power density of the motor. At the same time, increasing the number of slots in the stator slots 113 can generally improve the heat dissipation performance of the motor because the gaps between the slots contribute to the dissipation of heat.

[0052] In this embodiment, the number of rotor poles P is 10. First, as the number of rotor poles increases, the magnetic flux per pole decreases, which is beneficial to reducing the inductance of the winding 120 and the thickness of the stator yoke 111, thereby improving the power density of the motor, so that the motor has a larger power range and can achieve high-power output. Second, the number of poles of the rotor being 10 also indicates that the torque of the rotor is relatively large, which is suitable for occasions with heavy loads, and its large torque can ensure stable operation under heavy loads. Moreover, the motor with 10 rotor poles has a wide speed range and can adapt to different working environments. This characteristic enables the motor with five pairs of pole pairs to perform excellently in a variety of application scenarios.

[0053] Furthermore, the motor 1 with 10 poles starts smoothly and has low noise. The motor with 10 poles shows good smoothness during startup and has low noise. This is mainly due to its internal permanent magnet synchronous motor design and precise encoder feedback control. Finally, the motor with 10 poles has high efficiency: the motor with 10 poles has high efficiency during operation. This is mainly due to its optimized design and precise control strategy, which can minimize energy losses.

[0054] Of course, it should be noted that although there are several advantages to having 10 rotor poles, as the number of pole pairs increases, the magnetic leakage phenomenon between the magnetic poles will increase, resulting in a decrease in the utilization rate of the permanent magnet material. In addition, increasing the number of poles may also lead to an increase in the core loss of the motor and the switching loss of the power switch tube. Therefore, in the case of changes in application scenarios and different requirements of users, the number of rotor poles can also be 6, 14, etc.

[0055] Optionally, a groove 115 is provided on the outer ring surface of the stator yoke 111. First, the groove 115 can be precisely fitted with corresponding parts (such as the rotor or other components) during assembly to ensure the correct relative positions of the components inside the motor, thus ensuring the normal operation of the motor. This positioning function helps to reduce assembly errors and improve the overall performance of the motor. Second, the groove 115 can serve as a channel for lubricating oil or coolant to help guide the oil back from inside the motor to the oil tank or cooling system. During the operation of the motor, due to friction and heat generation, lubricating oil is required to reduce wear and lower the temperature. The oil return function of the groove 115 can effectively collect this oil and guide the oil back to the oil tank through a specific design to achieve the recycling of the oil.

[0056] Further, the groove 115 includes a first groove section and a second groove section that are connected and communicate with each other. The width of the first groove section is smaller than that of the second groove section, and the second groove section is arranged close to the outer ring surface of the stator yoke 111. This can increase the flow area of lubricating oil or coolant, thereby improving the oil return efficiency and further improving the heat dissipation efficiency. Of course, the present invention is not limited to this. In other embodiments, the groove 115 can also be an arc-shaped groove or a square groove as a whole.

[0057] Wherein, an auxiliary groove is provided on the stepped surface of the first groove section and the second groove section. This auxiliary groove is beneficial to increasing the oil return area of the groove 115, thereby improving the oil return efficiency and further improving the heat dissipation efficiency.

[0058] Further, the first groove section can be arc-shaped, V-shaped, square or trapezoidal, and the second groove section can be trapezoidal or square, etc. The specific shapes of the first groove section and the second groove section are not limited herein.

[0059] Further, an auxiliary groove is provided on the free end face of the stator tooth 112. It can be understood that since the vibration deformation of the stator core 110 caused by the radial component is the main source of electromagnetic noise, by providing an auxiliary groove on the free end face of the stator tooth 112, even when the corresponding relationship between the outer periphery of the motor rotor and the inner periphery of the motor stator is point-to-face, the order of the radial electromagnetic force wave can still be improved by improving the stator slot 113, the deformation of the stator punching sheet can be reduced, and further the lowest spatial order component of the radial electromagnetic force wave can be reduced to achieve the purpose of reducing the vibration noise of the motor.

[0060] The present invention also provides a compressor, which includes a motor. The specific structure of the motor refers to the above embodiments. Since this motor adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated herein one by one.

[0061] The present invention also provides a refrigeration device, which includes a compressor. The specific structure of the compressor refers to the above embodiments. Since this compressor adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated herein one by one.

[0062] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A motor, characterized in that: include: A stator, wherein the stator comprises a stator core and a winding, wherein the minimum inner circle contour radius of the stator core is R2, the stator core comprises a stator yoke and a plurality of stator teeth, the stator yoke is arranged in an annular shape, and the plurality of stator teeth are arranged at intervals along the circumferential direction of the inner annular surface of the stator yoke to form a stator slot between any two adjacent stator teeth, the winding is wound on the stator teeth, the number of the stator slots is Q, and the slot length of the stator slots is H; and The rotor is rotatably disposed in the stator, the number of poles of the rotor is P, the greatest common divisor of Q and P is X, and 0.4≤(H*X 2 -60X) / 2R2≤1.

3.

2. The motor according to claim 1, characterized in that The diameter of the wire of the winding is D, and a transition fillet is provided between the stator teeth and the stator yoke. The radius of the transition fillet is R1, and the range of R1 is: D / 2≤R1≤D.

3. The motor according to claim 2, characterized in that 0.5mm≤D≤1mm.

4. The motor according to claim 2, characterized in that The range of R1 is: 1mm≤R1≤3mm.

5. The motor according to claim 1, characterized in that The range of R2 is 24mm≤R2≤57mm.

6. The motor according to claim 1, characterized in that 13mm≤H≤15mm.

7. The motor according to any one of claims 1 to 6, characterized in that: The Q is 15.

8. The motor according to any one of claims 1 to 6, characterized in that: The outer annular surface of the stator yoke is provided with a groove.

9. The motor according to claim 8, characterized in that The groove includes a first groove section and a second groove section which are connected to each other. The width of the first groove section is smaller than the width of the second groove section. The second groove section is arranged close to the outer annular surface of the stator yoke.

10. A compressor, characterized in that: Comprising the electric machine as claimed in any one of claims 1 to 9.

11. A refrigeration device, characterized in that: Comprising the compressor of claim 10.

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