Stator assembly, electric machine, compressor and refrigeration appliance

Abstract

This invention discloses a stator assembly, a motor, a compressor, and a refrigeration device, relating to the field of induction motor technology. The stator assembly includes a stator core and stator windings. The stator core has Q stator slots, which are divided into large slots and small slots according to their cross-sectional area. The stator windings include concentrically wound main windings and auxiliary windings. The main windings have m coils, and the auxiliary windings have n coils. The main windings are numbered B1, B2, B3...B according to their winding span from largest to smallest. m The secondary windings are numbered A1, A2, A3, ... A, according to their winding span from largest to smallest. n ;B2 to B m In the stator slots where the coils are located, there is at least one single main winding slot, and each single main winding slot contains only the main winding. At least one of the single main winding slots is a minor slot; 16≦Q≦32, 3≦m≦14, 3≦n≦12. The technical solution provided by this invention is used to reduce the harmonic ratio of the motor, thereby reducing motor heat generation and improving motor efficiency.

Description

Technical Field

[0001] This invention relates to the field of induction motor technology, and particularly to a stator assembly, an induction motor, a compressor, and a refrigeration device. Background Technology

[0002] Induction motors are widely used in household appliances, industrial equipment, and office automation equipment, especially in air conditioner compressors. The number of stator slots is a key parameter in motor design, directly affecting its performance. By rationally determining the number of stator slots, high-order harmonics in the air gap magnetic flux density can be reduced. The placement of the stator windings in stator slots of different sizes is also an important factor affecting motor performance. Properly positioning the windings in stator slots of different areas can improve the harmonic content in the motor windings, thereby increasing motor efficiency, reducing heat generation, and ultimately improving motor reliability. Summary of the Invention

[0003] The main objective of this invention is to provide a stator assembly, motor, compressor, and refrigeration device that reduces harmonic generation, improves motor efficiency, and reduces motor heat generation.

[0004] To achieve the above objectives, the present invention provides a stator assembly comprising:

[0005] The stator core has Q stator slots, which are divided into large slots and small slots according to their cross-sectional area.

[0006] The stator winding is wound in the stator slots and includes a concentrically wound main winding and an auxiliary winding. The main winding has m coils, and the auxiliary winding has n coils. The main windings are numbered B1, B2, B3, ..., B1 according to their winding span from largest to smallest. m The secondary windings are numbered A1, A2, A3, ..., A, according to their winding spans from largest to smallest. n ;

[0007] Wherein, B2 to B m In the stator slots where the coils are located, there is at least one single main winding slot, and the single main winding slot contains only a main winding; at least one of the single main winding slots is a minor slot; and / or, A2 to A... n In the stator slots where the coils are located, there is at least one single auxiliary winding slot, and the single auxiliary winding slot contains only an auxiliary winding. At least one of the single auxiliary winding slots is a small slot; 16≦Q≦32, 3≦m≦14, 3≦n≦12.

[0008] In one embodiment, the main winding includes a first main winding and a second main winding arranged opposite to each other, and the auxiliary winding includes a first auxiliary winding and a second auxiliary winding arranged opposite to each other; the first main winding and the first auxiliary winding and the second auxiliary winding are arranged intersectingly, and the second main winding and the first auxiliary winding and the second auxiliary winding are arranged intersectingly.

[0009] In one embodiment, the main windings B2 to B m The stator slots in which the coils are located have at least two adjacent shared slots, and the shared slots contain a main winding and a secondary winding.

[0010] In one embodiment, the grooves are of at least two types.

[0011] In one embodiment, the number of slots is at least four.

[0012] In one embodiment, the stator core has a cutout on its outer contour, the cutout corresponding to the slot.

[0013] In one embodiment, the stator winding is an aluminum wire winding.

[0014] In one embodiment, the outer diameter of the stator core is 60mm-200mm; and / or, the inner diameter of the stator core is 30mm-100mm.

[0015] The present invention also proposes an electric motor, comprising the above-described stator assembly and a rotor assembly disposed inside the stator assembly.

[0016] In one embodiment, the rotor assembly includes a rotor core and a rotor winding, the rotor winding being a squirrel cage structure.

[0017] The present invention also proposes a compressor comprising the aforementioned motor.

[0018] The present invention also proposes a refrigeration device, including the compressor described above.

[0019] The induction motor of the present invention improves the harmonic content in the motor winding, increases the efficiency of the motor, and reduces the heat generation of the motor by setting the position of the stator winding in different stator slots. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 A cross-sectional structural schematic diagram of an embodiment of the motor provided by the present invention;

[0022] Figure 2 A schematic cross-sectional view of another embodiment of the motor provided by the present invention;

[0023] Figure 3 A cross-sectional structural schematic diagram of another embodiment of the motor provided by the present invention;

[0024] Figure 4 A cross-sectional structural schematic diagram of another embodiment of the motor provided by the present invention.

[0025] Explanation of icon numbers:

[0026] 100. Stator assembly; 10. Stator core; 11. Stator slot; 12. Stator yoke; 13. Stator tooth; 14. Stator shoe; 15. Cutout; 111. Large slot; 112. Small slot; 1121. First small slot; 1122. Second small slot; 113. Single main winding slot; 114. Single auxiliary winding slot; 115. Common slot; 20. Stator winding; 21. Main winding; 211. First main winding; 212. Second main winding; 22. Auxiliary winding; 221. First auxiliary winding; 222. Second auxiliary winding; 200. Rotor assembly. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0029] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0030] As an important household appliance, the performance of the air conditioner's motor is a key focus for manufacturers. Air conditioner compressors typically use induction motors, and the placement of the stator windings in stator slots of different sizes is a crucial factor affecting motor performance. Properly positioning the windings in stator slots of varying cross-sectional areas can improve the harmonic content of the motor windings, thereby increasing motor efficiency, reducing heat generation, and enhancing reliability.

[0031] Therefore, this application designs a stator assembly and a motor using the stator assembly.

[0032] Please refer to Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of this application provides a stator assembly 100, including a stator core 10 and a stator winding 20. The stator core 10 has Q stator slots 11, which are of various sizes. The stator slots 11 are divided into large slots 111 and small slots 112 according to their cross-sectional area. The stator winding 20 is wound in the stator slots 11, and includes a main winding 21 and a secondary winding 22 concentrically wound in the stator slots 11. The main winding has m coils, and the secondary winding 22 has n coils. The main windings 21 are numbered B1, B2, B3...B1 according to their span from largest to smallest. m The secondary windings 22 are numbered A1, A2, A3...A in descending order of span. n B2 to B in the main winding 21 m In the stator slots 11 corresponding to the coils between them, there is at least one single main winding slot 113, the single main winding slot 113 has only the main winding 21, and the single main winding slot 113 has at least one minor slot; and / or, the secondary windings 22 from A2 to A... nIn the stator slot 11 corresponding to the coil between them, there is at least one single auxiliary winding slot 114, the single auxiliary winding slot 114 has only auxiliary winding 22, and at least one of the single auxiliary winding slots 114 is a small slot; wherein, 16≦Q≦32, 3≦m≦14, 3≦n≦12.

[0033] Specifically, the stator core 10 is formed by stacking and pressing together a plurality of stator laminations. The stator core 10 includes a stator yoke 12, stator teeth 13, and stator shoes 14. A stator slot 11 is formed between two adjacent stator teeth 13, and the stator slot 11 is used to accommodate the stator winding 20. In this embodiment, the number of stator slots 11 is Q, and the stator slots 11 include at least two size types. The stator slots 11 are distinguished according to their cross-sectional area, and the cross-section is a plane perpendicular to the axis of the stator core 10. The stator slots 11 include large slots 111 and small slots 112. The large slot 111 is the slot with the largest cross-sectional area, and the small slot 112 has a smaller cross-sectional area than the large slot 111. In this embodiment, stator slots with a cross-sectional area difference of less than 5% are considered to be of the same type.

[0034] The stator winding 20 is wound in the stator slot 11, and in this application, a concentric winding method is used for winding. The stator winding 20 includes a main winding 21 and an auxiliary winding 22. The main winding 21 includes m coils, and the auxiliary winding 22 includes n coils. The coil with the largest span in the main winding 21 is denoted by B1, the coil with the second largest span is denoted by B2, and so on, with the coil with the m-th largest span (i.e., the coil with the smallest span among all the coils in the main winding 21) being denoted by B... m Similarly, in secondary winding 22, the coil with the largest span is represented by A1, the coil with the second largest span by A2, and so on, with the coil with the nth largest span (i.e., the coil with the smallest span) represented by A... n express.

[0035] In this embodiment, when the stator winding 20 is wound in the stator slot 11, the same stator slot 11 may contain both the main winding 21 and the auxiliary winding 22, or it may contain only one of the main winding 21 or the auxiliary winding 22. The stator slot 11 containing both the main winding 21 and the auxiliary winding 22 is a shared slot 115; the stator slot 11 containing only the main winding 21 is a single main winding slot 113; and the stator slot 11 containing only the auxiliary winding 22 is a single auxiliary winding slot 114. B1 is located in the single main winding slot 113, and the single main winding slot 113 where B1 is located is a large slot 111. In the main winding 21, from B2 to B... m The coils between (i.e., B2, B3...B) m The stator slot 11 in which it is located has at least one single main winding slot 113, and at least one of the single main winding slots 113 is a small slot; and / or, in the secondary winding 22, slots A2 to A... n The coils between (i.e., A2, A3...A) nAt least one single-branch slot 114 exists in the stator slot 11 where Q is located, and at least one of the single-branch slots 114 is a small slot. Here, Q, m, and n are all integers. This design reduces the harmonic content in the motor windings, thereby improving motor efficiency, reducing heat generation, and enhancing motor reliability.

[0036] By rationally arranging the stator windings 20 in stator slots 11 of different sizes, the waveforms of the magnetomotive force and electromotive force can be made closer to sine waves, thereby reducing harmonic components. Reduced harmonic content reduces energy loss during motor operation, thus improving motor efficiency. Furthermore, reduced harmonic content lowers the heat generation of the motor windings, reducing heat loss and helping to extend the motor's service life and improve its reliability. Stator slots 11 are typically filled with a certain number of coil turns to ensure no wasted space. Therefore, the magnetic field generated by the coil is proportional to the cross-sectional area of ​​the stator slot 11. The larger the area of ​​the stator slot 11, the more coil turns it contains, and the greater the magnetomotive force generated. In this application, the main winding 21 with the largest span, B1, is placed in the largest slot 111 to maximize the magnetomotive force generated by B1. The magnetic field from B2 to B... m At least one small slot is provided in the single main winding slot between the slots, so the magnetomotive force generated by the corresponding coil in the small slot is less than the magnetomotive force generated by B1, and B2 and B in the main winding 21 are... m In some cases, the primary winding 21 and the secondary winding 22 share a stator slot 11. When both the primary winding 21 and the secondary winding 22 are located in the same stator slot 11, they can coordinate with each other to generate a suitable magnetomotive force. The magnetomotive force formed by the superposition of all coils in the stator assembly 100 of this application is closer to a sine wave, thereby reducing harmonic components. Verification has shown that the motor efficiency using the stator assembly 100 of this application is increased by 1%, and the total winding heat generation is reduced by 10%.

[0037] like Figure 1 In the embodiment shown, Q is 24, m is 5, and n is 4. In this case, B1 and B2 of the main winding 21 are located in the single main winding slot 113, and B2 of the main winding 21 is located in the smaller slot. For example... Figure 2 In the embodiment shown, Q is 24, m is 5, and n is 3. In this case, B1, B2, and B3 of the main winding 21 are located in the single main winding slot 113, and B3 of the main winding 21 is located in the smaller slot. For example... Figure 3 In the embodiment shown, Q is 24, m is 4, n is 4, B1 and B2 of the main winding 21 are located in a single main winding slot 113, and A1 and A2 of the secondary winding 22 are located in a single secondary winding slot 114, wherein A2 and B2 are both located in small slots.

[0038] In some optional embodiments, Q can be 16, 20, 24, 28, or 32; m can be 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, or 14; and n can be 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12. When Q, m, and n are limited to the above values, the coil B1 with the largest span in the main winding 21 is placed in the large slot 111, and B2 and B... m When at least one single-winding main group slot and at least one single-winding slot is a small slot in the stator slot 11 where the coils are located; and / or, when at least one single-secondary winding slot 114 and at least one single-winding slot is a small slot in the secondary winding 22, the harmonic content of the stator assembly 100 is reduced, the efficiency of the motor using the stator assembly 100 of this application is increased by 1%, and the total winding heat generation is reduced by 10%.

[0039] like Figure 2 As shown, in an optional embodiment, the main winding 21 includes a first main winding 211 and a second main winding 212 arranged opposite to each other, and the auxiliary winding 22 includes a first auxiliary winding 221 and a second auxiliary winding 222 arranged opposite to each other. In this embodiment, the main windings and auxiliary windings are staggered in the stator slots. The first main winding and the second main winding are symmetrically arranged about the horizontal axis, and the first auxiliary winding and the second auxiliary winding are symmetrically arranged about the vertical axis. The first main winding is interleaved with the first auxiliary winding and the second auxiliary winding, and the second main winding is interleaved with the first auxiliary winding and the second auxiliary winding. This interleaved arrangement can reduce the proximity efficiency between coils, weaken the circulating current between conductors, and reduce circulating current loss. Furthermore, the interleaved arrangement provides more layout options for the main windings and auxiliary windings, which helps to meet the needs of different application scenarios. The stator assembly 100 of this embodiment is applied in a single-phase motor. There are two main windings 21, which together form a pair of N and S pole magnetic fields. The two auxiliary windings 22 also form a pair of N and S pole magnetic fields. The two main windings and the two auxiliary windings are arranged alternately.

[0040] In an optional embodiment, in the main windings B2 to B m The coil is located in at least two adjacent shared slots in the stator, and these shared slots are arranged adjacent to each other. For example... Figure 1 In the illustrated embodiment, there are three shared slots, arranged adjacent to each other. Each shared slot simultaneously houses both the main winding and the auxiliary winding. The two windings can coordinate with each other, facilitating a smooth magnetic field transition and resulting in a more sinusoidal magnetic field generated by the stator assembly.

[0041] In one alternative embodiment, there are at least two types of slots. Figure 1 , Figure 2 and Figure 3 In the embodiments, there is one type of small slot. In these embodiments, the stator slot 11 includes a large slot 111 and a small slot 112. Figure 4In this embodiment, there are two types of slots 112. The stator slots 11 include large slots 111 and two types of slots 112, namely, a first slot 1121 and a second slot 1122. The cross-sectional area of ​​the second slot 1122 is smaller than that of the first slot 1121. In this embodiment, Q is 24, m is 5, and n is 3. The B2 coil and the B3 coil of the main winding 21 are both in the slots 112, with the B2 coil located in the first slot 1121 and the B3 coil located in the second slot 1122. The magnetomotive force generated by the B1 coil is the largest, the magnetomotive force generated by the B2 coil is smaller than that generated by the B1 coil, and the magnetomotive force generated by the B3 coil is smaller than that generated by the B2 coil. The magnetomotive force generated by each coil shows a decreasing trend, making the rise height of each step closer to a sine curve, which can reduce the harmonic content, thereby improving the efficiency of the motor, reducing the heat generation of the motor, and improving the reliability of the motor.

[0042] In one optional embodiment, the number of slots is at least four.

[0043] like Figure 2 As shown, in an optional embodiment, the outer contour of the stator core 10 has cutouts 15, which correspond to slots. Specifically, the outer contour of the stator yoke of the stator core 10 has multiple cutouts 15. The stator yoke of the stator core 10 is used for magnetic flux. Since this application has multiple slots, while maintaining the original magnetic flux density, the width of the stator yoke 12 at the corresponding position of the slot can be appropriately reduced to form a gap in the outer contour of the stator core 10. This gap can be used to flow the refrigerant in the compressor to improve heat dissipation efficiency. It is understood that the cutouts 15 can correspond to a portion of the slots, and it is not necessary for each slot to correspond to a cutout 15. As long as there is enough space for the refrigerant to flow, it is not necessary to set too many cutouts 15, which would make the area of ​​the stator yoke of the stator core 10 too small, increase the magnetic density of the stator yoke, and thus reduce the efficiency of the motor. In this embodiment, the number of cutouts 15 is four. It should be noted that the attached... Figure 2 The cut shown is for illustrative purposes only. The cut is a regular, straight shape. The cut can be an arc-shaped structure, or it can be an irregular structure formed by multiple consecutive straight line segments or arc-shaped line segments. The specific shape of the cut can be set according to actual needs and is not limited here.

[0044] In an optional embodiment, the stator winding 20 is an aluminum wire winding. Aluminum wire windings have lower coil costs, which can reduce equipment costs, and aluminum has a lower density, which can reduce the weight of the stator assembly 100, thereby reducing the weight of the motor. Aluminum is a renewable resource, and aluminum wire windings are more environmentally friendly, which helps to reduce the consumption of natural resources.

[0045] In one optional embodiment, the outer diameter of the stator core 10 is 60mm-200mm, and the inner diameter of the stator core 10 is 30mm-100mm. In this embodiment, the power range of the motor is 300W-6000W, the outer diameter of the stator core 10 is set in the range of 60mm-200mm, and the inner diameter of the stator core 10 is set in the range of 30mm-100mm.

[0046] This application also relates to an electric motor, specifically a single-phase induction motor. It includes the aforementioned stator assembly 100 and a rotor assembly 200 disposed within the stator assembly 100. The motor of this application, employing the aforementioned stator assembly 100, can reduce harmonic content, thereby improving motor efficiency, reducing motor heat generation, and ultimately enhancing motor reliability.

[0047] The rotor assembly 200 includes a rotor core and rotor windings. The motor rotor is a squirrel-cage structure made of aluminum. The rotor core includes multiple laminated rotor laminations with multiple through holes. The rotor windings include aluminum conductor bars inserted into the through holes and end rings at both ends of the aluminum conductor bars, forming a squirrel-cage structure. The squirrel-cage rotor winding structure is simple, low-cost, and has good short-circuit withstand capability.

[0048] This application also relates to a compressor that includes the aforementioned motor, wherein B2 and B in the main winding 21 of the stator assembly 100 of the compressor... m In the stator slots 11 corresponding to the coils between them, there is at least one single main winding slot 113, the single main winding slot 113 contains only the main winding 21, and the single main winding slot 113 has at least one minor slot; and / or, the secondary windings 22 A2 and A n In the stator slots 11 corresponding to the coils between them, there is at least one single auxiliary winding slot 114, and each single auxiliary winding slot 114 contains only an auxiliary winding 22. At least one of the single auxiliary winding slots 114 is a small slot; wherein 16≦Q≦32, 3≦m≦14, and 3≦n≦12. By setting the position of the stator winding 20 in different stator slots 11, the harmonic content in the motor windings can be improved, the motor efficiency can be increased, and the motor heat generation can be reduced.

[0049] This application also relates to a refrigeration device that employs the aforementioned compressor. The refrigeration device can be a refrigerator, air conditioner, etc. The compressor's stator assembly 100 has windings B2 and B2 in its main winding 21. m In the stator slots 11 corresponding to the coils between them, there is at least one single main winding slot 113, the single main winding slot 113 contains only the main winding 21, and the single main winding slot 113 has at least one minor slot; and / or, the secondary windings 22 A2 and A nIn the stator slots 11 corresponding to the coils between them, there is at least one single auxiliary winding slot 114, and each single auxiliary winding slot 114 contains only an auxiliary winding 22. At least one of the single auxiliary winding slots 114 is a small slot; wherein 16≦Q≦32, 3≦m≦14, and 3≦n≦12. By setting the position of the stator winding 20 in different stator slots 11, the harmonic content in the motor windings can be improved, the motor efficiency can be increased, and the motor heat generation can be reduced.

[0050] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A stator assembly, characterized in that, include: A stator core having Q stator slots, the stator slots being divided into large slots and small slots according to their cross-sectional area; The stator winding is wound in the stator slots and includes a concentrically wound main winding and an auxiliary winding. The main winding has m coils, and the auxiliary winding has n coils. The main windings are numbered B1, B2, B3, ..., B1 according to their winding span from largest to smallest. m The secondary windings are numbered A1, A2, A3, ..., A1 according to their winding spans from largest to smallest. n ; Wherein, B2 to B m In the stator slots where the coils are located, there is at least one single main winding slot, and the single main winding slot contains only a main winding; at least one of the single main winding slots is a minor slot; and / or, A2 to A... n In the stator slots where the coils are located, there is at least one single auxiliary winding slot, and the single auxiliary winding slot contains only an auxiliary winding. At least one of the single auxiliary winding slots is a small slot; 16≦Q≦32, 3≦m≦14, 3≦n≦12.

2. The stator assembly as claimed in claim 1, characterized in that, The main winding includes a first main winding and a second main winding arranged opposite to each other, and the auxiliary winding includes a first auxiliary winding and a second auxiliary winding arranged opposite to each other; the first main winding is arranged intersecting with the first auxiliary winding and the second auxiliary winding, and the second main winding is arranged intersecting with the first auxiliary winding and the second auxiliary winding.

3. The stator assembly as claimed in claim 1, characterized in that, The main winding B2 to B m The stator slot in which the coil is located has at least two adjacent shared slots, and the shared slots contain a main winding and a secondary winding.

4. The stator assembly as claimed in claim 1, characterized in that, The grooves are of at least two types.

5. The stator assembly as claimed in claim 1, characterized in that, The number of slots is at least four.

6. The stator assembly as claimed in claim 1, characterized in that, The stator core has cutouts on its outer contour, and the cutouts are provided corresponding to the slots.

7. The stator assembly as claimed in claim 1, characterized in that, The stator winding is an aluminum wire winding.

8. The stator assembly as claimed in claim 1, characterized in that, The outer diameter of the stator core is 60mm-200mm; and / or, the inner diameter of the stator core is 30mm-100mm.

9. An electric motor, characterized in that, It includes a stator assembly as described in any one of claims 1 to 8 and a rotor assembly disposed inside the stator assembly.

10. The motor as described in claim 9, characterized in that, The rotor assembly includes a rotor core and a rotor winding, wherein the rotor winding has a squirrel cage structure.

11. A compressor, characterized in that, Including the motor as described in claim 9 or 10.

12. A refrigeration device, characterized in that, Includes the compressor as described in any one of claims 11.

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