Stator core, stator, motor, fixed-frequency variable-speed compressor and refrigeration equipment

Abstract

The utility model discloses a motor, a fixed-frequency variable-speed compressor and refrigeration equipment, and belongs to the field of refrigeration. A plurality of stator tooth parts of the stator core are arranged at intervals along the circumferential direction of the inner circumferential wall of a stator yoke part of the stator core, a stator slot is formed between every two adjacent stator tooth parts, the sizes of the plurality of stator slots are the same and meet the condition that W / (R-r) is greater than or equal to 0.3 and less than or equal to 0.9, W is the slot depth of the stator slots, R is the radius of an inscribed circle of the outer wall of the stator core, and r is greater than or equal to 0.3 and less than or equal to 0.9. R is the inner diameter of the stator. According to the stator iron core, the sectional area of magnetic line circulation of the stator iron core can be increased and the saturation degree of a magnetic field can be reduced by setting the proportional relation between the stator grooves and the stator yoke parts, so that the motor efficiency is improved.

Description

Technical Field

[0001] This application belongs to the field of refrigeration technology, and in particular relates to a stator core, stator, motor, fixed-frequency variable-speed compressor and refrigeration equipment. Background Technology

[0002] The compressor is the core component of the refrigeration system in refrigerators, freezers, and other refrigeration equipment. It provides power for the refrigeration cycle by compressing the refrigerant, maintaining the low-temperature environment of the refrigeration equipment. The operating status of the compressor directly affects the cooling effect and energy consumption level of the refrigeration equipment.

[0003] Currently, most refrigeration equipment uses compressors that operate at fixed frequencies and speeds, and the motors inside the compressors are inefficient, making it difficult to match the different operating conditions of the refrigeration equipment. Utility Model Content

[0004] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a stator core, a stator, a motor, a constant-frequency variable-speed compressor, and a refrigeration device, which can improve motor efficiency.

[0005] In a first aspect, this application provides a stator core, wherein a plurality of stator teeth of the stator core are arranged circumferentially along the inner peripheral wall of the stator yoke of the stator core, and stator slots are formed between adjacent stator teeth. The plurality of stator slots have the same size and satisfy: 0.3≤W / (Rr)≤0.9, where W is the slot depth of the stator slot, R is the radius of the inscribed circle of the outer wall of the stator core, and r is the inner diameter of the stator.

[0006] According to the stator core of this application, by setting the ratio between the stator slot and the stator yoke, the cross-sectional area for the flow of magnetic lines of force can be increased, the degree of magnetic field saturation can be reduced, thereby improving the efficiency of the motor.

[0007] According to one embodiment of this application, the outer peripheral wall of the stator yoke in the stator core includes at least one set of oppositely arranged arc-shaped walls, and at least two stator slots are correspondingly located within the central angle region of the same arc-shaped wall. The midpoint of the bottom of any stator slot within the central angle region of the arc-shaped wall is radially equidistant from the outer peripheral wall of the stator yoke.

[0008] According to one embodiment of this application, the midpoints of the bottoms of the plurality of stator slots are all located on the same target circle concentric with the arcuate wall.

[0009] According to one embodiment of this application, the radial distance D from the bottom of the stator slot to the outer peripheral wall of the stator yoke satisfies: 3mm≤D≤15mm.

[0010] Secondly, this application provides a stator, comprising:

[0011] Stator core, wherein the stator core is the stator core described in any of the above embodiments;

[0012] Stator winding, the stator winding being wound around the stator teeth of the stator core.

[0013] According to the stator of this application, by setting any of the above-mentioned stator cores, the cross-sectional area for the flow of magnetic lines of force can be increased, the degree of magnetic field saturation can be reduced, thereby improving the efficiency of the motor.

[0014] According to one embodiment of this application, the stator winding includes a first coil section and a second coil section with different numbers of pole pairs.

[0015] According to one embodiment of this application, the first coil portion and the second coil portion are connected in series.

[0016] Thirdly, this application provides an electric motor, comprising:

[0017] Stator, wherein the stator is the stator of any of the above embodiments;

[0018] The rotor has multiple rotor slots of the same size in its rotor core.

[0019] According to the motor of this application, by setting any of the above-mentioned stators, the cross-sectional area for the flow of magnetic lines of force can be increased, the degree of magnetic field saturation can be reduced, thereby improving the motor efficiency.

[0020] Fourthly, this application provides a fixed-frequency variable-speed compressor, including the motor described above.

[0021] According to the fixed-frequency variable-speed compressor of this application, by setting any of the above-mentioned motors, the cross-sectional area for the flow of magnetic lines of force can be increased, the degree of magnetic field saturation can be reduced, thereby improving the motor efficiency.

[0022] Fifthly, this application provides a refrigeration device, including the aforementioned fixed-frequency variable-speed compressor.

[0023] According to the refrigeration equipment of this application, by setting any of the above-mentioned fixed-frequency variable-speed compressors, the cross-sectional area of ​​magnetic field lines can be increased, the magnetic field saturation can be reduced, thereby improving the motor efficiency.

[0024] Additional aspects and advantages of this application 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 this application. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0026] Figure 1 This is one of the structural schematic diagrams of the fixed-frequency variable-speed compressor provided in the embodiments of this application;

[0027] Figure 2 This is a second schematic diagram of the structure of the fixed-frequency variable-speed compressor provided in the embodiments of this application;

[0028] Figure 3 This is the third schematic diagram of the fixed-frequency variable-speed compressor provided in the embodiments of this application;

[0029] Figure 4 This is the fourth schematic diagram of the fixed-frequency variable-speed compressor provided in the embodiments of this application;

[0030] Figure 5 This is the fifth schematic diagram of the fixed-frequency variable-speed compressor provided in the embodiments of this application;

[0031] Figure 6 This is the sixth schematic diagram of the fixed-frequency variable-speed compressor provided in the embodiments of this application;

[0032] Figure 7 This is the seventh schematic diagram of the fixed-frequency variable-speed compressor provided in the embodiments of this application;

[0033] Figure 8 This is the eighth schematic diagram of the fixed-frequency variable-speed compressor provided in the embodiments of this application;

[0034] Figure 9 This is the ninth schematic diagram of the fixed-frequency variable-speed compressor provided in the embodiments of this application;

[0035] Figure 10 This is the tenth schematic diagram of the fixed-frequency variable-speed compressor provided in the embodiments of this application;

[0036] Figure 11 This is eleventh of the structural schematic diagrams of the fixed-frequency variable-speed compressor provided in the embodiments of this application;

[0037] Figure 12 This is one of the parameter relationship diagrams of the fixed-frequency variable-speed compressor provided in the embodiments of this application;

[0038] Figure 13 This is the second parameter relationship diagram of the fixed-frequency variable-speed compressor provided in the embodiments of this application;

[0039] Figure 14 This is the third of the parameter relationship diagrams for the fixed-frequency variable-speed compressor provided in the embodiments of this application;

[0040] Figure 15 This is the twelfth schematic diagram of the structure of the fixed-frequency variable-speed compressor provided in the embodiments of this application;

[0041] Figure 16 This is the thirteenth schematic diagram of the fixed-frequency variable-speed compressor provided in the embodiments of this application;

[0042] Figure 17 This is the fourteenth schematic diagram of the fixed-frequency variable-speed compressor provided in the embodiments of this application;

[0043] Figure 18 This is the fifteenth schematic diagram of the fixed-frequency variable-speed compressor provided in the embodiments of this application;

[0044] Figure 19 This is the sixteenth schematic diagram of the fixed-frequency variable-speed compressor provided in the embodiments of this application;

[0045] Figure 20 This is the seventeenth schematic diagram of the fixed-frequency variable-speed compressor provided in the embodiments of this application;

[0046] Figure 21 This is the eighteenth schematic diagram of the fixed-frequency variable-speed compressor provided in the embodiments of this application;

[0047] Figure 22 This is the nineteenth schematic diagram of the fixed-frequency variable-speed compressor provided in the embodiments of this application.

[0048] Figure label:

[0049] Refrigeration equipment 1000;

[0050] 100-type fixed-frequency variable-speed compressor;

[0051] Stator core 11, stator lamination 111, stator yoke 1111, arc-shaped wall 11111, connecting hole 11112, stator tooth 1112, stator slot 1113, stator connecting rod 112, outer wall inscribed circle 113;

[0052] First assembly 113, first connecting part 1131, second assembly 114, second connecting part 1141, first protrusion 115, second protrusion 116, third protrusion 117, mounting hole 118;

[0053] Stator winding 12;

[0054] Rotor core 13, rotor laminations 131, rotor slots 132, arc-shaped section 1321, straight section 1322;

[0055] Crankshaft 14, oil passage hole 141;

[0056] Housing 15, terminal block 151, terminal block 1511, mounting cavity 152, lubricating oil sump 1521;

[0057] Cylinder 16, Input terminal 161;

[0058] Lubrication assembly 17, oil pipe 171, oil core 172, spiral groove 1721, first limiting part 1722

[0059] Limiting component 18. Detailed Implementation

[0060] The embodiments of this application are described in detail below. Examples of the 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 this application, and should not be construed as limiting this application.

[0061] The following is for reference. Figures 1-22 This application describes a stator core 11, a stator, a motor, a constant-frequency variable-speed compressor 100, and a refrigeration device 1000 according to embodiments of the present application.

[0062] It should be noted that the refrigeration equipment 1000 in this embodiment can be understood as a refrigeration storage device in a broad sense, including but not limited to refrigerators, freezers, display cases, beverage cabinets, wine cabinets, refrigerated display cases, and refrigerated vending machines. The refrigeration equipment 1000 has various structural forms and a wide range of applications.

[0063] The refrigeration equipment 1000 includes a cabinet and a door. The cabinet includes a shell, an inner liner, and an insulation layer located between the shell and the inner liner. The shell covers the inner liner and provides protection. The insulation layer can be a foam layer, which provides insulation and cushioning. The space between the shell and the inner liner forms a machine compartment, which is used to house machines such as compressors and circuit breakers.

[0064] Currently, most compressors in mid-to-low-end refrigeration equipment on the market are fixed-frequency compressors. This means that when the rated input voltage is 220V and the frequency is 50Hz, the compressor operates at a fixed speed of approximately 3000r / min. Regardless of whether the refrigeration equipment is under high or low load conditions, the compressor operates at this speed, resulting in high power consumption and relatively high noise (36-38dB). Improvements are needed.

[0065] High-load conditions can be defined as: the refrigerator operating temperature is 30℃ or above, or the user puts in a large amount of food, or the door is opened frequently every day; low-load conditions can be defined as: the refrigerator operating temperature is 25℃ or below, or a small amount of food is stored, or the door is opened less frequently every day.

[0066] The refrigeration equipment 1000 provided in this application, by incorporating a fixed-frequency variable-speed compressor 100, allows the compressor to operate at two or more speeds—approximately 3000 r / min (high speed) and approximately 1500 r / min (low speed)—by altering the windings of the fixed-frequency compressor, while maintaining a constant input voltage of 220V, frequency of 50Hz, and compressor dimensions. The high and low speeds of the fixed-frequency variable-speed compressor 100 correspond to the high-load and low-load operating conditions of the refrigeration equipment 1000, respectively. When the refrigeration equipment 1000 is under low-load conditions, the fixed-frequency variable-speed compressor 100 operates at low speed, significantly reducing power consumption and noise levels.

[0067] This application provides a fixed-frequency variable-speed compressor 100, which has multiple speeds. For example, the fixed-frequency variable-speed compressor 100 has a first target speed and a second target speed, where the first target speed is greater than the second target speed.

[0068] like Figure 1 As shown, the fixed-frequency variable-speed compressor 100 of this application includes: a housing 15, a motor, a cylinder 16, and a lubrication assembly 17. The motor, cylinder 16, and lubrication assembly 17 are all installed inside the housing 15. The lubrication assembly 17 is used to lubricate the friction parts in the motor and cylinder 16.

[0069] This application provides a stator core 11, which includes a plurality of stator laminations 111 stacked along the axial direction.

[0070] like Figure 2 As shown, the stator lamination 111 includes a stator yoke 1111 and a plurality of stator teeth 1112 with the same radial length. The plurality of stator teeth 1112 are connected to the inner peripheral wall of the stator yoke 1111 and are arranged circumferentially along the inner peripheral wall of the stator yoke 1111. A stator groove 1113 is formed between adjacent stator teeth 1112.

[0071] Several stator teeth 1112 are arranged circumferentially along the inner peripheral wall of the stator yoke 1111.

[0072] The stator teeth 1112 extend outward from the center of the stator laminations 111, forming a spoke-like structure. The stator teeth 1112 are used to support the stator windings 12 and provide a magnetic flux path.

[0073] The multiple stator slots 1113 have the same dimensions; in other words, the multiple stator teeth 1112 have the same radial length; that is, any two adjacent stator slots 1113 have the same radial dimension.

[0074] In related technologies, the stator core 11 of a fixed-frequency compressor is affected by the size and structure of the stator laminations, resulting in varying sizes of the stator slots 1113.

[0075] This application sets the stator slots 1113 to the same structure, which can increase the slot depth of the stator slots 1113, thereby increasing the wire diameter of the winding conductors, reducing copper losses, and improving motor efficiency.

[0076] The stator yoke 1111 is the annular part on the stator lamination 111 that connects the various stator teeth 1112.

[0077] Among them, such as Figure 2 As shown, the stator core 11 satisfies: 0.3≤W / (Rr)≤0.9, where W is the groove depth of the stator slot 1113, R is the radius of the inscribed circle 113 of the outer wall of the stator core 11, and r is the inner diameter of the stator.

[0078] For example, W / (Rr) can be 0.3, 0.5, 0.7, 0.8 or 0.9.

[0079] According to the stator core 11 provided in the embodiments of this application, by setting the ratio between the stator slot 1113 and the stator yoke 1111, the cross-sectional area for the flow of magnetic lines of force can be increased, the degree of magnetic field saturation can be reduced, thereby improving the efficiency of the motor.

[0080] In actual verification, the motor efficiency of this application can be increased from 60.9% to 65.7%.

[0081] In some embodiments, such as Figure 2 As shown, the outer peripheral wall of the stator yoke 1111 of the stator core 11 includes at least one set of oppositely arranged arc-shaped walls 11111. The arc-shaped walls 11111 on the outer peripheral wall of the stator yoke 1111 can optimize the distribution of magnetic flux and improve the electromagnetic performance of the motor.

[0082] The curved wall 11111 may include one or more pairs.

[0083] For example, the arc-shaped walls 11111 can be arranged opposite each other on opposite sides of the stator core 11; or, two pairs of arc-shaped walls 11111 can be arranged opposite each other on two opposite sides of the stator core 11.

[0084] There are at least two stator slots 1113 within the central angle region of the same arc-shaped wall 11111. The midpoint of the bottom of the at least two stator slots 1113 within the central angle region of the same arc-shaped wall 11111 is radially equidistant from the outer peripheral wall of the stator yoke 1111.

[0085] In other words, the multiple connection points of the multiple stator teeth 1112 and the stator yoke 1111 located in the central angle region of the same arc-shaped wall 11111 are all radially equidistant from the outer peripheral wall of the stator yoke 1111.

[0086] In this embodiment, at any point on the region of the stator yoke 1111 corresponding to the arc-shaped wall 11111, the resistance encountered by the magnetic flux is the same, which improves the uniformity of the magnetic flux distribution.

[0087] It is understandable that when the outer diameter of the stator core 11 remains unchanged, increasing the slot depth of the stator slot 1113 reduces the effective cross-sectional area through which the magnetic field lines flow around the stator core 11, making it easier for magnetic field saturation to occur.

[0088] According to the stator core 11 provided in the embodiments of this application, by including opposing arc-shaped walls 11111 on the outer peripheral wall of the stator yoke 1111 and setting the proportional relationship between the stator slot 1113 and the stator yoke 1111, the cross-sectional area for the flow of magnetic lines of force can be increased, the degree of magnetic field saturation can be reduced, thereby improving the efficiency of the motor.

[0089] In some embodiments, such as Figure 2 As shown, the multiple connection points connecting the stator teeth 1112 and the stator yoke 1111 are arranged in a circular array concentric with the arc wall 11111, which can improve the utilization rate of the stator core 11 and increase the efficiency of the motor.

[0090] In other words, the centers of the bottoms of the multiple stator slots 1113, which are far from the center of the stator yoke 1111, form a circular array concentric with the arc-shaped wall 11111.

[0091] In other words, the inner peripheral wall of the stator yoke 1111 is concentrically arranged with the arc-shaped wall 11111.

[0092] In other words, the midpoints of the bottoms of the multiple stator slots 1113 are all located on the same target circle concentric with the arc-shaped wall 11111.

[0093] In this embodiment, the symmetry and stability of the stator core 11 structure can be improved, and the uniformity of the stator teeth 1112 distributed on the stator yoke 1111 is enhanced, thereby optimizing the magnetic flux path and improving the electromagnetic performance of the motor. Simultaneously, this arrangement also helps to strengthen the mechanical strength of the stator core 11, enabling it to withstand greater electromagnetic forces and mechanical stresses.

[0094] In some embodiments, such as Figure 2 As shown, the groove depth W of the stator groove 1113 satisfies: 8mm≤W≤30mm. For example, the groove depth W of the stator groove 1113 can be 8mm, 10mm, 15mm, 16.5mm, 17.5mm, 19mm, or 20mm.

[0095] As shown in Table 1, with the same inner diameter of the stator core 11, increasing the slot depth of the stator slot 1113 from 11.53 mm to 17.5 mm can increase the wire diameter of the stator winding 12, reduce copper loss, and improve motor efficiency.

[0096] Table 1 Stator Data

[0097]

[0098]

[0099] In some embodiments, such as Figure 2 As shown, the radial distance D from the bottom of the stator slot 1113 to the outer peripheral wall of the stator yoke 1111 satisfies: 3mm≤D≤15mm.

[0100] For example, D can be 3mm, 5mm, 8.5mm, 10mm, 12mm or 15mm.

[0101] In this embodiment, by setting the radial distance from the bottom of the stator slot 1113 to the outer peripheral wall of the stator yoke 1111, the utilization rate of the stator core 11 can be improved and the motor efficiency can be increased.

[0102] For example, stator slot 1113 is a flat-bottomed slot or a pear-shaped slot.

[0103] In some embodiments, the stator slot 1113 is a flat-bottomed slot. When the number of stator slots 1113 is small and the stator width-to-depth ratio is large, using a flat-bottomed slot can effectively increase the slot area, improve the utilization rate of the stator core, and enhance the motor efficiency.

[0104] In some embodiments, such as Figure 2 As shown, the stator yoke 1111 is provided with a connecting hole 11112, and the multiple connecting holes 11112 of the multiple stator laminations 111 are aligned.

[0105] The stator core 11 also includes a plurality of stator connecting rods 112, each stator connecting rod 112 being connected in sequence to the connecting hole 11112 at the same position on each stator lamination 111, so as to stack and fix the plurality of stator laminations 111 along the axial direction.

[0106] The stator connecting rod 112 can be a stator bolt, and the stator is connected to the cylinder 16 through the stator connecting rod 112.

[0107] The stator connecting rod 112 and the corresponding connecting hole 11112 can be connected by means of plug-in, threaded connection or other methods.

[0108] In some embodiments, such as Figure 2As shown, each stator yoke 1111 is provided with multiple connecting holes 11112, which are spaced apart along the circumference of the stator lamination 111. The multiple connecting holes 11112 at the same position of the multiple stator laminations 111 are aligned along the axial direction, so that the multiple stator laminations 111 can be connected at multiple points, thereby improving the stability of the connection.

[0109] In some embodiments, such as Figure 11 As shown, the stator yoke 1111 is provided with a mounting hole 118, which is used to install the limiting member 18.

[0110] Multiple mounting holes 118 can be provided, so that the limiting member 18 and the stator yoke 1111 form a multi-point connection, increasing the stability of the connection.

[0111] The limiting member 18 is used to limit the circumferential degree of freedom of the oil core 172 of the lubrication assembly 17, so as to restrict the oil core 172 from moving during the rotation of the oil pipe 171 with the motor rotor, so that the oil core 172 and the oil pipe 171 can move relative to each other, so that the lubricating oil in the lubricating oil pool 1521 can rise to the friction part along the oil passage between the oil pipe 171 and the oil core 172.

[0112] The limiting component 18 can be a suspension spring, a limiting frame, or a limiting wire, etc.

[0113] In this case, one or more stator laminations 111 have a stator yoke 1111 with a mounting hole 118, or one or more stator laminations 111 have a stator yoke 1111 connected to an assembly, and the assembly is provided with a mounting hole 118.

[0114] This application also provides a stator, which includes a stator winding 12 and a stator core 11 of any of the above embodiments, wherein the stator core 11 is wound on the stator teeth 1112 of the stator core 11.

[0115] According to the stator provided in the embodiments of this application, by setting the stator core 11 of any of the above embodiments, the cross-sectional area for magnetic field lines to flow can be increased, the magnetic field saturation degree can be reduced, thereby improving the motor efficiency (60.9% → 65.7%). In some embodiments, the stator winding 12 includes a first coil portion and a second coil portion, and the number of pole pairs of the first coil portion and the second coil portion are different so that the motor has a first target speed and a second target speed.

[0116] The first target speed and the second target speed are different. For example, the first target speed can be greater than the second target speed, the first target speed is high speed, and the second target speed is low speed.

[0117] The first coil section can be designed with fewer pole pairs (e.g., 2 or 4 poles) to achieve high speed. The second coil section can be designed with more pole pairs (e.g., 6 or 8 poles) to achieve low speed.

[0118] In practical applications, when the motor needs to operate at the first target speed, only the first coil section is energized, at which point the motor will run at high speed at the first target speed. Due to the small number of pole pairs, the frequency of change of the rotating magnetic field is high, thereby driving the rotor to rotate at a relatively fast speed.

[0119] When the motor needs to operate at the second target speed, only the second coil section is energized, or both coil sections are energized simultaneously but the current ratio is adjusted. In this case, the motor will run at the second target speed at a low speed. Due to the large number of pole pairs, the frequency of change of the rotating magnetic field is low, thus driving the rotor to rotate at a slower speed.

[0120] According to the stator provided in this application, by setting a first coil section and a second coil section with different pole pairs, it is possible to operate at a first target speed or a second target speed under the condition that the input voltage and frequency remain unchanged. When the cooling capacity demand corresponds to a high load condition, the refrigeration equipment 1000 can be controlled to operate at the first target speed to meet the cooling demand and cool quickly. When the cooling capacity demand corresponds to a low load condition, the refrigeration equipment 1000 can be controlled to operate at the second target speed to achieve the cooling effect while effectively reducing the power consumption of the fixed frequency variable speed compressor 100 and significantly reducing the noise.

[0121] In some embodiments, the stator winding 12 is a double-layer winding design.

[0122] Each stator slot 1113 has two layers of winding sides, upper and lower, and the upper and lower layers of winding sides in the stator slot 1113 are insulated from each other.

[0123] In this embodiment, the stator winding 12 adopts a double-layer winding configuration, which has a large output per unit volume and good performance. It can make fuller use of the space in the stator slot 1113 without changing the external dimensions of the compressor, thereby increasing the number of turns and conductor cross-sectional area of ​​the winding, improving the electromagnetic performance of the motor, reducing energy loss, and improving the efficiency of the fixed-frequency variable-speed compressor 100.

[0124] In some embodiments, the end of the stator winding 12 does not protrude from the housing 15.

[0125] In this embodiment, the end dimensions of the stator winding 12 are controlled to be the same as or similar to those of the original compressor before the improvement, so that the dimensions of the cylinder 16 are not changed. There is no need to redesign and manufacture the structural dimensions of the cylinder 16. The cylinder 16 is universal and does not increase the cost of the fixed-frequency variable-speed compressor 100.

[0126] In some embodiments, the first coil section and the second coil section are connected in series, which can reduce the number of outgoing wires.

[0127] In this design, the beginnings and ends of the first and second coil sections are connected together in opposite order. When current flows through these coils, the magnetic fields they generate will either cancel each other out or reinforce each other.

[0128] In traditional commutation connection methods, each coil section requires an independent lead-out terminal for connection to external circuits. In this application, the stator winding 12 is connected in reverse series, and since the first and second coil sections are directly connected, some lead-out terminals can be eliminated, thus simplifying the motor's wiring structure.

[0129] Those skilled in the art can choose between the commutation method or the reverse method for series connection based on actual needs.

[0130] This application embodiment also provides an electric motor, which includes a rotor and a stator as described in any of the above embodiments. The rotor is disposed within the stator, and the rotor core 13 of the rotor has multiple rotor slots 132 of the same size.

[0131] According to the embodiments of this application, the motor is provided with a stator as described in any of the above embodiments. On the other hand, by setting a first coil section and a second coil section with different pole pairs, it can achieve operation at a first target speed or a second target speed when the input voltage and frequency remain unchanged. In this embodiment, the multiple rotor slots 132 of the rotor lamination 131 have the same structure, which can increase the slot depth of the rotor slots 132 and improve the motor efficiency.

[0132] In some embodiments, the rotor includes a rotor core 13 and rotor windings, the rotor core 13 including a plurality of rotor laminations 131 stacked axially. For example... Figure 3 As shown, the rotor lamination 131 includes a plurality of rotor slots 132 arranged at intervals along the circumference, and the plurality of rotor slots 132 of the rotor lamination 131 have the same size.

[0133] In this embodiment, the multiple rotor slots 132 of the rotor lamination 131 have the same structure, which can increase the slot depth of the rotor slots 132 and improve the motor efficiency.

[0134] The rotor slot 132 includes two straight segments 1322 that are circumferentially distributed along the rotor lamination 131 and an arc segment 1321 that is radially arranged opposite each other. The radius of the arc segment 1321 closer to the center of the rotor lamination 131 is smaller than the radius of the arc segment 1321 farther from the center of the rotor lamination 131. The straight segments 1322 and the arc segments 1321 are arranged alternately.

[0135] The distance between the ends of any two adjacent straight segments 1322 of the rotor slot 132 that are close to the center of the rotor lamination 131 is less than the diameter of the arc segment 1321 with the smaller radius among the two arc segments 1321.

[0136] In other words, such as Figure 3 As shown, the distance between the ends of two adjacent straight segments 1322 of any two adjacent rotor slots 132 that are close to the center of the rotor lamination 131 is less than the diameter of the arc segment 1321 that is close to the center of the rotor lamination 131.

[0137] In this embodiment, by setting the distance between two adjacent straight segments 1322 of any two adjacent rotor slots 132, the shape of the rotor slots 132 can be optimized, the area ratio of the rotor slots 132 on the rotor laminations 131 can be increased, the electromagnetic performance of the motor can be improved, and noise reduction can be achieved.

[0138] In some embodiments, such as Figure 3 As shown, the radius of the arc segment 1321 near the center of the rotor lamination 131 is smaller than the radius of the arc segment 1321 away from the center of the rotor lamination 131, and the distance between two adjacent straight segments 1322 of any two adjacent rotor slots 132 increases monotonically from the direction near the center of the rotor lamination 131 to the direction away from the center of the rotor lamination 131.

[0139] In this embodiment, the ratio of the radius of the arc segment 1321 near the center of the rotor lamination 131 to the radius of the arc segment 1321 at the center of the rotor lamination 131 is close to 1, which further increases the area ratio of the rotor slot 132 on the rotor lamination 131, which can improve the electromagnetic performance of the motor and play a role in noise reduction.

[0140] In this embodiment, as Figure 3 As shown, by optimizing the shape of the rotor slot 132, the total area of ​​the rotor slot 132 can be increased. For example, the total area B of the rotor slot 132 satisfies the condition that B / A = 1.1 to 2.1 compared to the total area A of the rotor slot in related technologies.

[0141] In this embodiment, the motor efficiency can be improved by optimizing the area ratio of the rotor slot 132 on the rotor lamination 131.

[0142] This application embodiment also provides a rotor lamination 131, applied to a fixed-frequency variable-speed compressor 100. The rotor lamination 131 includes a rotor slot 132, which includes a plurality of slots arranged circumferentially along the rotor lamination 131. The rotor slot 132 includes two arc-shaped segments 1321 that are radially opposite to each other along the rotor lamination 131 and two straight segments 1322 that are circumferentially opposite to each other along the rotor lamination 131. The central angle of the arc-shaped segment 1321 closer to the center of the rotor lamination 131 is smaller than the central angle of the arc-shaped segment 1321 farther from the center of the rotor lamination 131. The average distance between the two adjacent straight segments 1322 of any two adjacent rotor slots 132 is smaller than the diameter of the arc-shaped segment 1321 closer to the center of the rotor lamination 131.

[0143] According to the rotor lamination 131 provided in the embodiments of this application, the shape of the rotor slot 132 can be optimized, and the area ratio of the rotor slot 132 on the rotor lamination 131 can be increased, which can improve the electromagnetic performance of the motor and play a role in noise reduction.

[0144] This application also provides a fixed-frequency variable-speed compressor, including the motor of any of the above embodiments.

[0145] According to the fixed-frequency variable-speed compressor provided in the embodiments of this application, by setting the motor of any of the above embodiments, it is possible to operate at variable speed. At the same time, by optimizing the stator core 11 and the rotor core 13, the motor efficiency can be improved.

[0146] In related technologies, an oil pipe is installed below the rotor of a fixed-frequency compressor, and a thin plate is installed inside the oil pipe. When the rotor is running (at a speed of 300 r / min), the thin plate disturbs the lubricating oil at the bottom of the compressor housing. Under the action of centrifugal force, the lubricating oil is transferred to the oil groove on the crankshaft, and then the lubricating oil lubricates the friction parts (cylinder and piston, crankshaft and connecting rod).

[0147] However, with the advancement of technology, the speed of fixed-frequency compressors has gradually increased, and the stator of fixed-frequency compressors has a large stack thickness. At low speeds (around 1500 r / min), the centrifugal force of fixed-frequency compressors is insufficient to deliver lubricating oil to the friction parts, and the friction parts cannot be effectively lubricated, so improvements are needed.

[0148] Therefore, this application provides a lubrication component 17 with a spiral oiling method.

[0149] In some embodiments, such as Figure 1 and Figure 4 As shown, the housing 15 forms a mounting cavity 152, and a lubricating oil pool 1521 is provided inside the mounting cavity 152; the mounting cavity 152 has a sealing effect and can be used to accommodate the electrode, the cylinder 16 and the lubricating oil. The lubricating oil pool 1521 is located at the bottom end of the mounting cavity 152 along the height direction.

[0150] The motor is installed in the mounting cavity 152 and is located above the lubricating oil sump 1521 to avoid direct contact between the motor and the lubricating oil. The motor includes a stator, a rotor and a crankshaft 14.

[0151] The rotating parts of the motor may include the motor rotor and crankshaft 14.

[0152] The cylinder 16 is installed in the mounting cavity 152, and the input end 161 of the cylinder 16 is poweredly coupled to the rotating part of the motor. For example, the cylinder 16 is poweredly coupled to the crankshaft 14, and the cylinder 16 and the stator can be connected by bolts to realize the transmission of power.

[0153] The lubrication assembly 17 includes an oil pipe 171 and an oil core 172, which extend from the lubricating oil sump 1521 into the motor, for example, into the rotor core 13 or the crankshaft 14. The radial projections of the oil pipe 171 and the oil core 172 overlap with the radial projections of the rotor core 13 or the crankshaft.

[0154] Oil pipe 171 is connected to the rotating part, oil pipe 171 is powered and coupled to the rotor, or oil pipe 171 is powered and coupled to the crankshaft 14, or oil pipe 171 is powered and coupled to both the rotor and the crankshaft 14, so as to realize the transmission of power.

[0155] The oil core 172 and / or oil pipe 171 are provided with spiral grooves 1721.

[0156] For example, the outer wall of the oil core 172 is provided with a spiral groove 1721, see [reference]. Figure 1 and Figure 4 Alternatively, the inner wall of the oil pipe 171 may be provided with a spiral groove 1721, see [reference needed]. Figure 16 and Figure 17 Alternatively, both the outer wall of the oil core 172 and the inner wall of the oil pipe 171 may be provided with spiral grooves 1721; or the oil core 172 may be a hollow structure, with spiral grooves 1721 provided on the inner wall of the oil core 172. (See also...) Figure 21 and Figure 22 Alternatively, a threaded rod with an internal thread groove may be provided between the oil core 172 and the oil pipe 171, with the oil core 17 located inside the threaded rod. See [reference needed]. Figure 19 and Figure 20 .

[0157] In this embodiment, the outer wall of the oil core 172 is provided with a spiral groove 1721, and an oil passage is formed between the inner wall of the oil pipe 171 and the spiral groove 1721 of the oil core 172; or the inner wall of the oil pipe 171 is provided with a spiral groove 1721, and an oil passage is formed between the outer wall of the oil core 172 and the spiral groove 1721 of the oil pipe 171; or both the outer wall of the oil core 172 and the inner wall of the oil pipe 171 are provided with spiral grooves 1721. When the spiral grooves 1721 of the oil core 172 and the spiral grooves 1721 of the oil pipe 171 are correspondingly arranged, an oil passage is formed between the oil core 172 and the oil pipe 171. When the spiral grooves 1721 of the oil core 172 and the spiral grooves 1721 of the oil pipe 171 are misaligned, multiple oil passages are formed between the oil core 172 and the oil pipe 171; or an oil passage is formed between the oil core 172 and the threaded rod.

[0158] When the motor rotates, the rotating part of the motor drives the oil pipe 171 to rotate together through the power coupling connection. Since there is relative rotation between the oil pipe 171 and the oil core 172, and an oil passage is formed between the inner wall of the oil pipe 171 and the spiral groove 1721 on the outer wall of the oil core 172, the lubricating oil can be driven by the spiral groove 1721 to rise along the oil passage. The rising lubricating oil can lubricate the friction parts of the motor, reduce friction and wear, and improve the operating efficiency and life of the motor.

[0159] The friction parts of the motor can be between the cylinder 16 and the piston, or between the crankshaft 14 and the connecting rod.

[0160] The shape and angle of the spiral groove 1721 can be adjusted according to the motor speed, load and lubrication requirements to achieve the best lubrication effect.

[0161] The oil core 172 is fitted inside the oil pipe 171, and the oil core 172 and the oil pipe 171 can include at least the following two types of mating:

[0162] Firstly, the oil core 172 can be clearance-fitted with the oil pipe 171.

[0163] In this embodiment, the oil pipe 171 is loosely fitted outside the oil core 172, and the outer wall of the oil core 172 is spaced apart from the inner wall of the oil pipe 171 to improve the smoothness of the oil passage and reduce the risk of blockage.

[0164] See Figure 4 and Figure 17 The outer wall of the oil core 172 or the inner wall of the oil pipe 171 is provided with a spiral groove 1721 that rises spirally. The oil pipe 171 and the oil core 172 are rotated relative to each other to form an oil passage between the inner wall of the oil pipe 171 and the oil core 172.

[0165] In some embodiments, such as Figure 4 As shown, the gap d between the inner wall of the oil pipe 171 and the outer wall of the oil core 172 satisfies: 0.05mm≤d≤0.25mm.

[0166] For example, d can be 0.05mm, 0.1mm, 0.15mm or 0.25mm.

[0167] The preferred gap d between the inner wall of the oil pipe 171 and the outer wall of the oil core 172 satisfies: 0.08mm≤d≤0.2mm.

[0168] For example, d can be 0.08mm, 0.1mm, 0.12mm or 0.2mm.

[0169] In this embodiment, by limiting the gap between the oil pipe 171 and the oil core 172, the stability of oiling the oil core 172 can be improved, and the impact of the actual production accuracy of the oil core 172 can be reduced.

[0170] Wherein, when a spiral groove is provided on the outer wall of the oil core 172, d is the gap between the top of the spiral groove of the oil core 172 and the inner wall of the oil pipe 171; when a spiral groove is provided on the inner wall of the oil pipe 171, d is the gap between the top of the spiral groove of the oil pipe 171 and the outer wall of the oil core 172.

[0171] like Figure 12 As shown, the amount of oil applied first increases and then decreases as the gap d between the oil pipe 171 and the oil core 172 increases. By taking the gap d between the oil pipe 171 and the oil core 172 to be between 0.08mm ≤ d ≤ 0.2mm, a good amount of oil can be maintained and the lubrication effect can be improved.

[0172] Secondly, the oil core 172 can be interference-fitted with the oil pipe 171.

[0173] Among them, the oil core 172 is dynamically coupled to the oil pipe 171, see [reference]. Figure 22 The oil core 172 has a hollow structure and an inner spiral groove 1721 is provided inside the oil core 172. The oil core 172 rotates with the rotation of the oil pipe 171, and the lubricating oil rises along the spiral groove 1721 as the oil core 172 rotates. The rising lubricating oil can lubricate the friction parts of the motor.

[0174] For example, the oil core 172 can be directly fixedly connected to the oil pipe 171, for example, the oil pipe 171 can be directly connected to the oil pipe 171 by any one or a combination of riveting, welding, and threaded connection; or, the oil core 172 can be indirectly fixedly connected to the oil pipe 171.

[0175] In this embodiment, since the oil core 172 is connected to the oil pipe 171, the oil core 172 does not need to be connected to the rotating part of the motor through the limiting member 18, thus simplifying the structure.

[0176] The cylinder 16 includes a cylinder body, a piston, and a connecting rod. The two ends of the connecting rod are connected to the crankshaft 14 and the piston, respectively. The piston is designed to move within the cylinder body.

[0177] According to the fixed-frequency variable-speed compressor 100 provided in this application, by setting the lubrication component 17 with spiral oil supply, the height of lubricating oil delivery can be increased, and the structure with a large stator stack thickness can be effectively lubricated under the low-speed operation condition of the fixed-frequency variable-speed compressor 100.

[0178] In some embodiments, such as Figure 4 As shown, the helix angle θ of the spiral groove 1721 satisfies: 10°≤θ≤60°.

[0179] For example, the rise angle θ of the thread of the helical groove 1721 can be 10°, 20°, 35°, 40°, 55° or 60°.

[0180] Preferably, the helix angle θ of the spiral groove 1721 satisfies: 25°≤θ≤45°.

[0181] For example, the rise angle θ of the thread of the helical groove 1721 can be 25°, 30° or 45°.

[0182] In this embodiment, by limiting the rise angle θ of the spiral groove 1721, the fixed-frequency variable-speed compressor 100 can achieve good lubrication at both the first target speed and the second target speed.

[0183] like Figure 13 As shown, the solid line represents the oil application rate at 1500 r / min, and the solid line represents the oil application rate at 3000 r / min. The oil application rate at 1500 r / min gradually decreases as the rise angle θ of the spiral groove 1721 thread increases, while the oil application rate at 3000 r / min gradually increases as the rise angle θ of the spiral groove 1721 thread increases. By setting the rise angle θ of the spiral groove 1721 thread to satisfy 25°≤θ≤45°, a good oil application rate can be provided at both 1500 r / min and 3000 r / min of the motor.

[0184] In some embodiments, such as Figure 1 and Figure 4 As shown, the motor includes a stator, a rotor, and a crankshaft 14. The rotor is located inside the stator and mounted on the crankshaft 14. The input end 161 of the cylinder 16 is dynamically coupled to the crankshaft 14. The crankshaft 14 is provided with an oil passage hole 141.

[0185] The rotor is fixedly connected to the crankshaft 14.

[0186] The oil passage 141 of the crankshaft 14 can extend away from the lubricating oil sump 1521. The oil passage 141 of the crankshaft 14 is connected to the oil passage of the lubrication assembly so that the lubricating oil can lubricate the friction parts such as the cylinder 16 and piston, and the crankshaft 14 and connecting rod.

[0187] As a power transmission component between the rotor and the cylinder 16, the crankshaft 14 not only supports the rotor, but also transmits power to the cylinder 16 through its power coupling connection.

[0188] Oil pipe 171 is connected to crankshaft 14 or rotor, with one end of oil pipe 171 located inside oil passage hole 141 and the other end extending out of oil passage hole 141 and immersed in lubricating oil sump 1521.

[0189] The input end 161 of cylinder 16 is connected to crankshaft 14 via power coupling. When crankshaft 14 rotates, it drives cylinder 16 to perform corresponding working cycles (such as intake, compression, power, and exhaust).

[0190] In some embodiments, the oil pipe 171 is connected to the crankshaft 14, with one end of the oil pipe 171 located inside the oil passage 141 and the other end extending out of the oil passage 141 and immersed in the lubricating oil reservoir 1521. Thus, when the crankshaft 14 rotates, the oil pipe 171 rotates accordingly, while the oil core 172 remains stationary. The oil core 172 and the oil pipe 171 continuously draw lubricating oil through the end immersed in the lubricating oil reservoir 1521.

[0191] Lubricating oil drawn from the lubricating oil sump 1521 enters the crankshaft 14 through the oil pipe 171, and then enters the rotor or other parts requiring lubrication through the oil passage 141. As the crankshaft 14 rotates, the lubricating oil is evenly distributed on the surfaces requiring lubrication, achieving effective lubrication.

[0192] In some embodiments, such as Figure 1 As shown, the bottom end of the oil core 172 protrudes from the bottom end face of the stator winding 12 of the stator, and the bottom end of the oil core 172 is immersed in the lubricating oil pool 1521.

[0193] In some embodiments, such as Figure 1 and Figure 4 As shown, the fixed-frequency variable-speed compressor 100 satisfies h / H=λ, 0.4≤λ≤1.6; where h is the length of the oil core 172 and H is the stacking thickness of the stator core 11.

[0194] For example, λ can be 0.4, 0.6, 0.8, 1, 1.4 or 1.6.

[0195] Preferably, the fixed-frequency variable-speed compressor 100 satisfies h / H=λ, 0.8≤λ≤1.2. For example, λ can be 0.8, 0.9, 1.1 or 1.2.

[0196] In this embodiment, by limiting the ratio range of the length of the oil core 172 and the stacking thickness of the stator core 11, the oiling of the lubricating oil can be improved at low speeds.

[0197] like Figure 14 As shown, the amount of oil applied is positively correlated with the ratio λ. By setting 0.8≤λ≤1.2, the oil application can be improved within a suitable λ range.

[0198] In some embodiments, such as Figure 1 As shown, the distance L from the bottom of the oil core 172 protruding from the bottom end face of the stator winding 12 satisfies: L≥6mm. For example, L can be 6mm, 10mm or a larger value.

[0199] In this embodiment, by limiting the distance L by which the bottom of the oil core 172 protrudes beyond the bottom end face of the stator winding 12, the oil suction port can be sufficiently lower than the oil surface, thereby improving the lubrication effect.

[0200] In some embodiments, such as Figure 1 As shown, the fixed-frequency variable-speed compressor 100 also includes a limiting member 18, which is connected to the oil core 172 and to the stator and / or housing 15 to limit the circumferential degree of freedom of the oil core 172, thereby allowing the oil pipe 171 and the oil core 172 to rotate relative to each other.

[0201] The oil pipe 171 is connected to the rotating part of the motor so that the oil pipe 171 moves synchronously with the rotating part. The oil core 172 is connected to the stator or housing 15 so that the oil core 172 remains unchanged. When the motor is powered on, the oil pipe 171 and the oil core 172 rotate relative to each other.

[0202] The limiting member 18 can be connected to the stator or the housing 15. For example, the limiting member 18 can be connected to the stator, or the limiting member 18 can be connected to the housing 15, or the limiting member 18 can be connected to both the stator and the housing 15, so as to limit the circumferential degree of freedom of the oil core 172, so that the oil pipe 171 and the oil core 172 can rotate relative to each other, thereby drawing lubricating oil from the lubricating oil pool 1521 to the friction part.

[0203] In this embodiment, as Figure 4 and Figure 18 As shown, the bottom end of the oil core 172 is provided with a first limiting part 1722, and the limiting member 18 is provided with a second limiting part. The first limiting part 1722 and the second limiting part are engaged to limit the circumferential degree of freedom of the oil core 172 during the rotation of the oil pipe 171.

[0204] For example, the first limiting part 1722 is a slot, and the second limiting part is a card that engages with the slot; or, the first limiting part 1722 is a through hole, and the limiting member 18 passes through the through hole.

[0205] In some embodiments, such as Figure 1 As shown, the motor includes a stator core 11, which includes multiple stator laminations 111, a first connecting portion 1131, and a second connecting portion 1141. The first connecting portion 1131 and the second connecting portion 1141 are disposed on the stator yoke 1111 of at least one stator lamination 111. The first connecting portion 1131 and the second connecting portion 1141 are symmetrically distributed radially. The two ends of the limiting member 18 are respectively connected to the first connecting portion 1131 and the second connecting portion 1141.

[0206] The first connecting part 1131 and the second connecting part 1141 can be integrated with one or more stator laminations 111 in the stator core 11, or they can be connected to the stator laminations 111 through other assemblies.

[0207] In related technologies, the suspension spring of the variable frequency compressor is fixed to the insulating frame of the motor. In this application, the two ends of the limiting member 18 are connected to the stator, which can eliminate the insulating frame structure of the motor, reduce the complexity of the structure, reduce the production cost, and increase the effective volume inside the housing 15.

[0208] For example, the first connecting part 1131 and the second connecting part 1141 can be a mounting hole 118, a snap-fit ​​groove, or a clamping part, etc.

[0209] According to the constant-frequency variable-speed compressor 100 provided in this application, by setting the first connecting part 1131 and the second connecting part 1141 to be symmetrically distributed radially along the stator lamination 111, the limiting member 18 is also a symmetrical structure. The center of the limiting member 18 is connected to the oil core 172, and the end of the limiting member 18 is connected to the first connecting part 1131 and the second connecting part 1141. When the motor is started, the limiting member 18 is subjected to symmetrical force, reducing stress concentration and improving the service life of the limiting member 18.

[0210] In some embodiments, such as Figure 1 As shown, multiple stator laminations 111 are stacked axially. The first connecting portion 1131 and the second connecting portion 1141 are disposed on the stator lamination 111 located near the bottom end along the height direction among the multiple stator laminations 111, so that the limiting member 18 can be connected to the oil core 172 and the stator lamination 111 at the same time.

[0211] In some embodiments, multiple stator laminations 111 are stacked axially, and a first connecting portion 1131 and a second connecting portion 1141 are disposed on the stator lamination 111 located at the bottom end along the height direction among the multiple stator laminations 111, which can reduce the assembly difficulty of the limiting member 18 and the stator lamination 111.

[0212] The locations of the first connecting part 1131 and the second connecting part 1141 include at least the following three:

[0213] Firstly, such as Figure 5 , Figure 7 and Figure 9 As shown, the first connecting part 1131 and the second connecting part 1141 are connected to the stator core 11 through the first fitting 113 and the second fitting 114.

[0214] In this configuration, the fixed-frequency variable-speed compressor 100 also includes a first assembly 113 and a second assembly 114. The first assembly 113 and the second assembly 114 are respectively disposed on at least one stator lamination 111 and are respectively connected to at least one stator connecting rod 112. The first assembly 113 is provided with a first connecting part 1131, and the second assembly 114 is provided with a second connecting part 1141.

[0215] The first assembly 113 can be connected to the stator lamination 111 via one or more stator connecting rods 112, and the second assembly 114 can be connected to the stator lamination 111 via one or more stator connecting rods 112. The connection method can be threaded connection, plug-in connection or snap-fit ​​connection.

[0216] In this embodiment, by using the first assembly 113 and the second assembly 114, multiple stator laminations 111 with the same structure can be produced using the same mold, eliminating the need to individually set the structure of multiple stator laminations 111 and open molds, thus reducing production difficulty and processing costs.

[0217] The first assembly 113 and the second assembly 114 have at least the following three structural forms.

[0218] First, such as Figure 5 and Figure 6 As shown, the inner walls of the first assembly 113 and the second assembly 114 are arc-shaped, and there are multiple stator slots 1113 in the central corner area of ​​the first assembly 113 and the second assembly 114. The first assembly 113 and the second assembly 114 are respectively connected to multiple stator connecting rods 112.

[0219] The first assembly 113 is connected to a plurality of stator connecting rods 112. For example, the first assembly 113 is connected to two stator connecting rods 112. The second assembly 114 is connected to a plurality of stator connecting rods 112. For example, the second assembly 114 is connected to two other stator connecting rods 112.

[0220] The first assembly 113 and the second assembly 114 are both provided with multiple assembly holes. The multiple assembly holes of the first assembly 113 are coaxially arranged with a portion of the connecting holes 11112 of the stator yoke 1111. The multiple assembly holes of the second assembly 114 are coaxially arranged with another portion of the connecting holes 11112 of the stator yoke 1111. The first assembly 113 and the second assembly 114 are respectively connected to the stator lamination 111 through multiple stator connecting rods 112.

[0221] The first assembly 113 and the second assembly 114 are symmetrically distributed on the stator lamination 111.

[0222] The first assembly 113 and the second assembly 114 are respectively connected to different stator connecting rods 112.

[0223] In this embodiment, by extending the circumferential length of the first assembly 113 and the second assembly 114, the first assembly 113 and the second assembly 114 can form a multi-point connection with the corresponding stator lamination 111, thereby improving the stability of the connection.

[0224] The first assembly 113 and the second assembly 114 both have a first protrusion 115. The first protrusion 115 protrudes radially from the outer wall of the stator yoke 1111. The first protrusion 115 of the first assembly 113 is provided with a first connecting portion 1131, and the first protrusion 115 of the second assembly 114 is provided with a second connecting portion 1141.

[0225] The first protrusion 115 of the first assembly 113 and the first protrusion 115 of the second assembly 114 are symmetrically distributed. By setting the structure that both the first assembly 113 and the second assembly 114 have the first protrusion 115, the first assembly 113 and the second assembly 114 can be sandwiched between two adjacent stator laminations 111, or they can be located at the bottom end of the stator core 11 along the axial direction, increasing the flexibility of the placement of the first assembly 113 and the second assembly 114.

[0226] The first assembly 113 and the second assembly 114 can be gaskets. The first assembly 113 and the second assembly 114 can be fixed to the stator core 11 by the stator connecting rod 112. The limiting member 18 is fixed to the first connecting part 1131 and the second connecting part 1141 on the gasket.

[0227] The first fitting 113 and the second fitting 114 do not protrude radially from the inner wall of the stator yoke 1111, so as to reduce the interference of the first fitting 113 and the second fitting 114 on the area of ​​the stator slot 1113.

[0228] In this embodiment, the first assembly 113 and the second assembly 114 are radially symmetrically distributed on the stator yoke 1111 so that the mounting holes 118 are radially aligned. The first connecting part 1131 and the second connecting part 1141 can both be mounting holes 118, and the axial direction of the mounting hole 118 is parallel to the axial direction of the connecting hole 11112.

[0229] The two ends of the limiting member 18 can be directly inserted into the mounting hole 118 along the height direction, reducing the difficulty of installation.

[0230] Second, such as Figure 7 and Figure 8 As shown, the first assembly 113 and the second assembly 114 are centrally symmetrically distributed on the stator lamination 111 and are respectively connected to different stator connecting rods 112.

[0231] Both the first assembly 113 and the second assembly 114 have a second protrusion 116, and the second protrusion 116 of the first assembly 113 and the second protrusion 116 of the second assembly 114 are centrally symmetrically distributed.

[0232] The second protrusion 116 of the first assembly 113 protrudes from the body of the first assembly 113, and the second protrusion 116 of the second assembly 114 protrudes from the body of the second assembly 114.

[0233] The second protrusion 116 of the first assembly 113 is provided with a first connecting part 1131, and the second protrusion 116 of the second assembly 114 is provided with a second connecting part 1141.

[0234] The first assembly 113 can be connected to one of the stator connecting rods 112, and the second assembly 114 can be connected to the other stator connecting rod 112. Both the first assembly 113 and the second assembly 114 can rotate around the connected stator connecting rod 112, improving the flexibility of the installation position.

[0235] When the second protrusion 116 protrudes beyond the outer diameter of the stator lamination 111, the first fitting 113 and the second fitting 114 can be sandwiched between two adjacent stator laminations 111, or they can be located at the bottom end of the stator core 11 along the axial direction, increasing the flexibility of the placement of the first fitting 113 and the second fitting 114.

[0236] When the second protrusion 116 does not protrude beyond the outer diameter of the stator lamination 111, the first fitting 113 and the second fitting 114 can be located axially at the bottom end of the stator core 11, reducing the impact on the outer diameter of the stator core 11.

[0237] The first assembly 113 and the second assembly 114 can be gaskets, and the limiting member 18 is fixed to the first connecting part 1131 and the second connecting part 1141 on the gasket.

[0238] The stator connecting rods 112 are centrally symmetrically distributed. The first assembly 113 and the second assembly 114 are each provided with an assembly hole. The assembly hole of the first assembly 113 is coaxially arranged with one of the connecting holes 11112 of the stator yoke 1111. The assembly hole of the second assembly 114 is coaxially arranged with one of the connecting holes 11112 of the stator yoke 1111. The first assembly 113 and the second assembly 114 can be fixed to the stator core 11 by a stator connecting rod 112.

[0239] The first connecting part 1131 and the second connecting part 1141 are both mounting holes 118, and the axial direction of the mounting hole 118 is perpendicular to the axial direction of the connecting hole 11112.

[0240] In this embodiment, the first connecting portion 1131 and the second connecting portion 1141 are centrally symmetrically arranged so that the mounting holes 118 are radially aligned, and the two ends of the limiting member 18 are radially connected to the two mounting holes 118.

[0241] Third, such as Figure 9 and Figure 10 As shown, both the first assembly 113 and the second assembly 114 are covers. The covers are provided on the ends of two centrally symmetrically distributed stator connecting rods 112 among a plurality of stator connecting rods 112. The covers are provided with a third protrusion 117. The third protrusion 117 of the first assembly 113 is provided with a first connecting part 1131. The third protrusion 117 of the second assembly 114 is provided with a second connecting part 1141.

[0242] In this structure, the first fitting 113 and the second fitting 114 can be nuts for the stator connecting rod 112, and the two first fittings 113 and the second fitting 114, which are provided with third protrusions 117, cover the end of the stator connecting rod 112.

[0243] The first assembly 113 and the second assembly 114 are symmetrically distributed on the stator lamination 111, so that the first connecting part 1131 and the second connecting part 1141 are distributed radially.

[0244] Secondly, such as Figure 11 As shown, the first connecting part 1131 and the second connecting part 1141 are directly disposed on the stator core 11.

[0245] In this embodiment, both the first connecting part 1131 and the second connecting part 1141 are mounting holes 118, and the stator yoke 1111 is provided with mounting holes 118.

[0246] In this embodiment, the multiple stacked stator laminations 111 include at least two structures: one is a stator lamination 111 with only connecting holes 11112, and the other is a stator lamination 111 with a first connecting portion 1131 and a second connecting portion 1141. The stator laminations 111 with the two structures are produced by different molds, which can omit structures such as the first assembly 113 and the second assembly 114, reduce the complexity of the structure, and reduce the assembly difficulty.

[0247] Among them, one of the multiple stacked stator laminations 111 is provided with two fourth protrusions. The fourth protrusions are provided with mounting holes 118 for connecting with the limiting member 18. This stator lamination 111 with the fourth protrusions is stacked together with other stator laminations 111 without the fourth protrusions to form a stator core 11. When assembling the fixed frequency variable speed compressor 100, the suspension spring is fixed to the two mounting holes 118.

[0248] Third, the first connecting part 1131 and the second connecting part 1141 are connected to the housing 15, that is, the two ends of the limiting member 18 are connected to the housing 15.

[0249] In some embodiments, such as Figure 15 As shown, the fixed-frequency variable-speed compressor 100 also includes a housing 15, and the housing 15 is provided with a terminal block 151. The terminal block 151 has multiple terminals 1511, one end of which is connected to multiple taps of the stator winding 12.

[0250] The number of terminals 1511 is greater than or equal to the number of outgoing taps of the stator winding 12 to meet wiring requirements.

[0251] This application embodiment also provides a stator core 11, applied to a fixed-frequency variable-speed compressor 100. The stator core 11 includes a plurality of stator laminations 111 stacked along the axial direction. The stator laminations 111 include:

[0252] The stator yoke 1111 has an outer peripheral wall including opposing arcuate walls 11111;

[0253] Multiple stator teeth 1112 of the same radial length are connected to the inner peripheral wall of the stator yoke 1111 and are arranged circumferentially along the inner peripheral wall of the stator yoke 1111. Stator slots 1113 are formed between adjacent stator teeth 1112. Multiple connection points between the multiple stator teeth 1112 and the stator yoke 1111 are arranged in a circular array concentric with the arc-shaped wall 11111.

[0254] According to the stator core 11 provided in the embodiments of this application, the cross-sectional area for the flow of magnetic lines of force can be increased and the magnetic field saturation can be reduced by providing relatively arranged arc-shaped walls 11111 on the outer peripheral wall of the stator yoke 1111 and providing a plurality of stator teeth 1112 with the same radial length, thereby improving the efficiency of the motor.

[0255] This application embodiment also provides a rotor core 13, which is applied to a fixed-frequency variable-speed compressor 100. The rotor core 13 includes a plurality of rotor laminations 131 stacked along the axial direction. The rotor laminations 131 include rotor slots 132.

[0256] The rotor slot 132 includes a plurality of slots arranged circumferentially along the rotor lamination 131. The rotor slot 132 includes two arc-shaped segments 1321 that are radially opposite to each other along the rotor lamination 131 and two straight segments 1322 that are circumferentially opposite to each other along the rotor lamination 131. The radius of the arc-shaped segment 1321 closer to the center of the rotor lamination 131 is smaller than the radius of the arc-shaped segment 1321 farther from the center of the rotor lamination 131. The distance between the ends of the two adjacent straight segments 1322 of any two adjacent rotor slots 132 that are close to the center of the rotor lamination 131 is smaller than the diameter of the arc-shaped segment 1321 that is close to the center of the rotor lamination 131.

[0257] According to the rotor core 13 provided in the embodiments of this application, by setting the distance between two close straight segments 1322 of any two adjacent rotor slots 132, the shape of the rotor slots 132 can be optimized, the area ratio of the rotor slots 132 on the rotor laminations 131 can be increased, the electromagnetic performance of the motor can be improved, and the noise reduction effect can be achieved.

[0258] This application also provides an electric motor for use in a fixed-frequency variable-speed compressor 100, comprising a stator and a rotor.

[0259] The stator includes a stator core 11 and a stator winding 12. The stator winding 12 is wound around the stator teeth 1112 of the stator core 11. The stator winding 12 includes a first coil section and a second coil section, and the first coil section and the second coil section have different numbers of pole pairs. The stator core 11 includes a plurality of stator laminations 111, and the plurality of stator slots 1113 of the stator laminations 111 have the same size.

[0260] The rotor is disposed within the stator and includes multiple rotor laminations 131. The multiple rotor slots 132 of the rotor laminations 131 are of the same size. The rotor slots 132 include two straight segments 1322 that are relatively distributed circumferentially along the rotor laminations 131 and arc segments 1321 that are relatively arranged radially. The straight segments 1322 and arc segments 1321 are arranged alternately. The distance between the ends of the two adjacent straight segments 1322 of any two adjacent rotor slots 132 that are close to the center of the rotor laminations 131 is less than the diameter of the arc segment 1321 with the smaller radius.

[0261] According to the motor provided in the embodiments of this application, on the one hand, under the condition that the input voltage and frequency remain unchanged, it can operate at a first target speed or a second target speed. When the cooling capacity demand corresponds to a high load condition, the refrigeration equipment 1000 can be controlled to operate at the first target speed to meet the cooling demand and cool quickly. When the cooling capacity demand corresponds to a low load condition, the refrigeration equipment 1000 can be controlled to operate at the second target speed to achieve the cooling effect while effectively reducing the power consumption of the fixed-frequency variable-speed compressor 100 and significantly reducing the noise. On the other hand, by optimizing the structure of the stator lamination 111 and the rotor lamination 131, the electromagnetic performance of the motor can be improved, which can reduce noise and improve the efficiency of the motor.

[0262] This application also provides a fixed-frequency variable-speed compressor 100, including: a housing 15, a motor, a cylinder 16, and a lubrication assembly 17.

[0263] The housing 15 forms a mounting cavity 152, and a lubricating oil pool 1521 is provided inside the mounting cavity 152;

[0264] The motor is installed in the mounting cavity 152 and is located above the lubricating oil sump 1521;

[0265] Cylinder 16 is installed in mounting cavity 152, and the input end 161 of cylinder 16 is power-coupled to the rotating part of motor.

[0266] The lubrication assembly 17 includes an oil pipe 171 and an oil core 172. The oil pipe 171 and the oil core 172 extend from the lubricating oil sump 1521 into the motor. The outer wall of the oil core 172 is provided with a rising spiral groove 1721. The oil pipe 171 is connected to the rotating part and is loosely fitted around the oil core 172 and rotates relative to the oil core 172 to form an oil passage between the inner wall of the oil pipe 171 and the spiral groove 1721. The radially outer end of the spiral groove 1721 is spaced apart from the inner wall of the oil pipe 171.

[0267] According to the embodiment of this application, the fixed-frequency variable-speed compressor 100, by setting the lubrication component 17 with spiral oiling method, can improve the height of lubricating oil delivery, effectively lubricate the structure with large stator stack thickness, and improve the application scenarios.

[0268] This application embodiment also provides a fixed-frequency variable-speed compressor 100, including: a housing 15, a motor, a cylinder 16, and a lubrication assembly 17; the housing 15 is provided with a lubricating oil sump 1521; the motor is installed inside the housing 15 and is located above the lubricating oil sump 1521, including a stator core 11, the stator core 11 including a plurality of stator laminations 111, a first connecting portion 1131 and a second connecting portion 1141, the first connecting portion 1131 and the second connecting portion 1141 being disposed on the stator yoke portion 1111 of at least one stator lamination 111, the first connecting portion 1131... The second connecting part 1141 is symmetrically distributed radially; the cylinder 16 is installed inside the housing 15, and the input end 161 is poweredly coupled to the rotating part of the motor; the lubrication assembly 17 includes an oil pipe 171 and an oil core 172, the oil pipe 171 and the oil core 172 extend from the lubricating oil pool 1521 into the stator core 11, the oil pipe 171 is connected to the rotating part, the oil pipe 171 is loosely fitted outside the oil core 172 and rotates relative to the oil core 172 to form an oil circuit; the limiting member 18 is connected to the oil core 172, and its two ends are respectively connected to the first connecting part 1131 and the second connecting part 1141.

[0269] According to the fixed-frequency variable-speed compressor 100 provided in the embodiments of this application, by connecting the two ends of the limiting member 18 to the stator, the insulation frame structure of the motor can be omitted, reducing the complexity of the structure, reducing production costs, and increasing the effective volume inside the housing 15.

[0270] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0271] In the description of this application, 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", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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 this application.

[0272] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0273] In the description of this application, "multiple" means two or more.

[0274] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0275] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0276] 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 this application. 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.

[0277] Although embodiments of this application 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 this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A stator core characterized by, The stator core has a plurality of stator teeth arranged circumferentially along an inner circumferential wall of a stator yoke of the stator core, and a stator slot is formed between adjacent stator teeth, the plurality of stator slots have the same size, and satisfy 0.3≤W / (R-r)≤0.9, wherein W is a slot depth of the stator slot, R is a radius of a circle inscribed by an outer wall of the stator core, and r is an inner diameter of the stator core.

2. The stator core according to claim 1, characterized by An outer circumferential wall of the stator yoke comprises at least one set of oppositely arranged arc-shaped walls, and each of the arc-shaped walls has at least two stator slots in a central angle region of the arc-shaped wall, and a midpoint of a slot bottom of any of the stator slots in the central angle region of the arc-shaped wall has the same radial distance to the outer circumferential wall of the stator yoke.

3. The stator core of claim 2, characterized by The midpoints of the slot bottoms of the plurality of stator slots are all located on a same target circle concentric with the arc-shaped walls.

4. The stator core of claim 2, characterized by A radial distance D from a bottom of the stator slot to the outer circumferential wall of the stator yoke satisfies 3mm≤D≤15mm.

5. A stator characterized by, The motor comprises: The stator core is the stator core according to any one of claims 1-4; The stator winding is wound on the stator teeth of the stator core.

6. The stator of claim 5, wherein The stator winding comprises a first coil portion and a second coil portion having different numbers of pole pairs.

7. A stator according to claim 6, characterised in that The first coil portion and the second coil portion are connected in series.

8. An electric machine characterized by The motor comprises: The stator is the stator according to any one of claims 5-7; The rotor has a plurality of rotor slots of the rotor core, and the plurality of rotor slots have the same size.

9. A fixed-speed variable- speed compressor characterized by The motor comprises the motor according to claim 8.

10. A refrigeration appliance characterized in that, The fixed-frequency variable-speed compressor comprises the fixed-frequency variable-speed compressor according to claim 9.

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