Stator core, motor and compressor

Abstract

The application provides a stator core, a motor and a compressor. The stator core comprises a ring-shaped yoke part formed by splicing a plurality of core modules and a plurality of tooth parts. Each of the core modules is formed by laminating a plurality of punching sheet units. The punching sheet unit has a yoke part assembly, a tooth part assembly and a plurality of salient poles extending outward from the outer periphery of the yoke part assembly in the radial direction of the yoke part assembly. An inner recessed gap is formed between two adjacent salient poles. At least one through hole is arranged between the inner periphery of the yoke part assembly and the salient poles and close to one side of the salient poles. The through holes on the laminated punching sheet units are communicated to form a channel for the refrigerant to flow through on the core module. The application increases the channel area of the refrigerant passing through the motor and improves the performance of the compressor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressor, in particular, to a stator core, a motor and a compressor. BACKGROUND

[0002] For the compressor motor with the integrally formed stator core, since the winding operation needs to be performed on the stator core, the winding needle gap needs to be reserved in the stator slot to avoid the winding needle from being hindered when winding, which results in the decrease of the coil area in the stator slot and the decrease of the slot fill factor, thereby increasing the motor copper loss and reducing the motor efficiency.

[0003] Therefore, in the prior art, many compressor motors adopt the block structure, i.e. the modular stator core, to avoid the above-mentioned shortcomings. In the production process of the modular stator core, a plurality of lamination units are first stacked to form a T-shaped core module, and then the winding is performed on the stator teeth of the T-shaped core module to form a stator module. All the stator modules are assembled to form a stator assembly in a ring shape. Therefore, the stator assembly includes the stator core and the stator winding. The stator core is composed of the T-shaped core modules arranged in a ring shape.

[0004] Since the winding is performed on the stator teeth of the T-shaped core module in the prior art to form the stator module, the winding needle will not be hindered when winding, so that the coil winding area of a single tooth is larger than that of the integrally formed stator core, thereby reducing the motor copper loss and improving the motor efficiency, but at the same time, it will also result in the decrease of the refrigerant flow area in the stator slot after the stator modules are assembled to form the stator assembly in a ring shape, thereby affecting the performance of the compressor. SUMMARY

[0005] Therefore, the present application provides a stator core, a motor and a compressor, which increase the channel area of the refrigerant passing through the motor and improve the performance of the compressor.

[0006] According to one aspect of the present application, a stator core is provided, which includes a ring-shaped yoke portion formed by a plurality of core modules spliced together and a plurality of tooth portions, each of the core modules being formed by a plurality of lamination units stacked together; the lamination unit has a yoke assembly, a tooth assembly and a plurality of salient poles extending outwardly from the outer periphery of the yoke assembly in the radial direction of the yoke assembly, and a recessed gap is formed between two adjacent salient poles.

[0007] At least one through hole is arranged between the inner periphery of the yoke assembly and the salient poles and close to one side of the salient poles; the through holes on the stacked lamination units are communicated to form a channel for the refrigerant to flow through on the core module.

[0008] Optionally, each of the core modules has two joint surfaces, and the plurality of core modules are jointed by the joint surfaces to form the stator core.

[0009] Optionally, the sum of the cross-sectional areas of all the through holes in the stator core is S1, and the sum of the cross-sectional areas of all the core modules is S2, and S1 and S2 satisfy 0.01≤S1 / S2≤0.06.

[0010] Optionally, the minimum distance between the through hole and the outer circumferential surface of the core module is g, and g satisfies 1≤g≤3.

[0011] Optionally, the through hole is a strip hole, the strip hole extends along a circular arc with the center point of the cross section of the stator core as the center, the length of the strip hole is c, and the width of the strip hole is e, and c and e satisfy 4≤c / e≤10.

[0012] Optionally, the through hole is a strip hole, the width of the strip hole is e, the minimum distance between the stator slot and the outer circumferential surface of the core module is f, and e and f satisfy 0.1≤e / f≤0.2.

[0013] Optionally, the minimum distance between the through hole and the outer circumferential surface of the core module is g, and the minimum distance between the through hole and the joint surface of the core module is j, and j and g satisfy 0.35≤j / g≤1.35.

[0014] Optionally, the minimum distance between the through hole and the outer circumferential surface of the core module is g, and the minimum distance between the through hole and the notch is h, and h and g satisfy 0.7≤h / g≤2.7.

[0015] According to another aspect of the present application, an electric machine is provided, comprising a stator assembly, the stator assembly comprising a stator winding and the above-mentioned stator core, the sum of the cross-sectional areas of all the through holes in the stator core is S1, the stator core is composed of n core modules, each of the core modules has a stator winding wound thereon, an insulating member is arranged between two adjacent stator windings, the thickness of the insulating member is t, the maximum slot width of the stator slot in the extension direction of the joint surface is L, and the coil factor is w, the coil factor is calculated according to the number of parallel branches of the coil in the stator winding and the size of the enameled wire in the coil; wherein S1, n, t, L and w satisfy the condition: 0.3≤S1 / [(w-t)*2*L*n]≤1.3.

[0016] Optionally, the number of parallel branches of the coil in each of the stator windings is m, m is a positive integer; when the enameled wire in the coil is round wire, the size of the enameled wire is the diameter of the conductor in the enameled wire; the diameter of the conductor in each of the enameled wires is d, and the coil coefficient is calculated according to the following formula:

[0017] Optionally, the number of parallel branches of the coil in each of the stator windings is m, m is a positive integer; when the enameled wire in the coil is flat wire, the size of the enameled wire is the length of the long side or the short side of the conductor in the cross section of the enameled wire; and the coil coefficient is calculated according to the following formula: wherein a represents the length of the long side or the short side of the conductor in the cross section of the enameled wire; when the side of the enameled wire in the coil which is in contact with the tooth portion of the stator core is the short side, a represents the length of the long side; and when the side of the enameled wire in the coil which is in contact with the tooth portion of the stator core is the long side, a represents the length of the short side.

[0018] According to another aspect of the present application, a compressor is provided, which comprises the above motor.

[0019] The present application has the following beneficial effects compared with the prior art:

[0020] The stator core, the motor and the compressor provided by the present application can form a channel for the refrigerant to flow through on the core module by arranging at least one through hole between the inner periphery of the yoke assembly of the punching unit and the convex pole and close to one side of the convex pole, and the through holes are communicated after the plurality of punching unit layers are stacked, so that the refrigerant can flow through the channel; the channel area for the refrigerant to pass through the motor is increased while the copper loss of the motor is reduced and the efficiency of the motor is improved, which is conducive to improving the performance of the compressor. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the application. It is apparent that the accompanying drawings described below are only some embodiments of the present application, and other drawings can be obtained from these drawings without creative labor for those skilled in the art.

[0022] Figure 1 FIG. 1 is a structure diagram of a punching unit of a stator core in the prior art;

[0023] Figure 2 FIG. 2 is a structure diagram of a stator assembly containing a stator winding and a stator core in the prior art;

[0024] Figure 3 FIG. 3 is a structure diagram of a punching unit of a stator core according to an embodiment of the present application;

[0025] Figure 4 Another schematic view of a lamination unit of a stator core according to an embodiment of the present application;

[0026] Figure 5 A schematic view of a cross section of a stator module formed after winding a stator winding of a core module according to an embodiment of the present application;

[0027] Figure 6 A schematic view of a cross section structure of a stator assembly according to an embodiment of the present application;

[0028] Figure 7 A schematic view of a lamination unit of a stator core according to another embodiment of the present application;

[0029] Figure 8 A schematic view of a lamination unit of a stator core according to another embodiment of the present application.

[0030] Reference numerals

[0031] 101 lamination unit

[0032] 102 rivet point

[0033] 103 stator assembly

[0034] 104 stator core

[0035] 201 lamination unit

[0036] 202 yoke assembly

[0037] 203 salient pole

[0038] 204 notch

[0039] 205 through hole

[0040] 206 tooth assembly

[0041] 207 stator core

[0042] 208 rivet point

[0043] 209 stator winding

[0044] 210 enameled wire

[0045] 211 insulating member DETAILED DESCRIPTION

[0046] Example implementations are now described with reference to the drawings. Example implementations can, however, be implemented in many different forms and should not be construed as limited to the implementations set forth herein. Rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example implementations to those skilled in the art. The described features, structures, or characteristics can be combined in one or more implementations. In the following description, numerous specific details are provided to give a thorough understanding of implementations of the disclosure. One skilled in the relevant art will recognize, however, that the implementations of the disclosure can be practiced without one or more of the

[0047] The terms "a," "an," "the," and "at least one" are used to

[0048] Figure 1 A structure schematic diagram of a lamination unit 101 of a core module constituting a modular stator core in the prior art. Since for the modular stator core, a plurality of lamination units 101 as shown in Figure 1 are stacked to form a T-shaped core module, that is, rivet connection is achieved through rivet points 102. Then the stator teeth of the T-shaped core module are wound, and then the wound T-shaped core module is assembled in a ring to form a stator assembly 103 as shown in Figure 2 All the T-shaped core modules in a ring constitute a stator core 104. In this way, the coil winding area of a single tooth of the stator core is larger than that of an integrally formed stator core, resulting in a smaller gap between two adjacent stator windings of the stator assembly, which in turn results in a reduced passage area of the refrigerant through the motor, affecting the performance of the compressor.

[0049] As shown in Figures 3-4 An embodiment of the present application discloses a lamination unit of a stator core. A plurality of lamination units 201 are stacked to form a core module, and then the teeth of the core module are wound to form a stator module. All the stator modules are assembled in a ring to form a stator assembly 103 as shown in Figure 6The stator assembly is shown. The laminated lamination units 201 are fixed by rivet points 208. Of course, the lamination units 201 can also be fixed by other means. The stator assembly includes a stator core and a stator winding. The stator core includes a ring-shaped yoke formed by splicing a plurality of core modules and a plurality of tooth portions.

[0050] The lamination unit 201 has a yoke assembly 202, a tooth assembly 206, and a plurality of salient poles 203 extending outwardly from the outer periphery of the yoke assembly 202. The tooth portions of the core modules are formed by laminating the tooth assembly 206 of the lamination unit. An inner recessed notch 204 is formed between two adjacent salient poles 203. That is, the notch 204 is recessed towards the center of the circular arc corresponding to the outer periphery of the lamination unit 201. The connection between the salient pole 203 and the notch 204 can be smoothly connected by a circular arc or a straight line. The bottom of the notch 204 can be a flat surface or an arc surface.

[0051] In this embodiment, at least one through hole 205 is provided between the inner periphery of the yoke assembly 202 and the side of the salient pole 203. The through hole 205 is designed to be long and narrow along the circumferential direction of the stator core 207. The through holes 205 of the laminated lamination units 201 are connected to form a channel for the refrigerant to flow through the core modules. After the refrigerant flows through the channel, the problem of reduced refrigerant flow area through the motor due to excessive coil winding area in the stator slot of the modular stator core 207 can be avoided, which can cause the performance of the compressor to decrease. On the other hand, the through hole 205 is designed to be long and narrow on the side close to the salient pole 203, which is also beneficial for the oil return of the compressor, thereby improving the reliability of the compressor.

[0052] The stator core has a stator slot between two adjacent tooth portions. The through hole 205 is located between the stator slot and the salient pole 203. During winding, the stator winding 209 is wound around the tooth portion of the core module.

[0053] In this embodiment, each core module has two splicing surfaces, and all the core modules are spliced by contacting the splicing surfaces to form the stator core 207. Of course, the adjacent two core modules can also be connected to form the stator core 207 by other assembly methods, such as clamping and welding.

[0054] As shown in Figures 3-4 In this embodiment, the through hole 205 is located between the notch 204 and the splicing surface, and there is one through hole 205 between the notch 204 and each splicing surface. Of course, the number of through holes 205 between the notch 204 and each splicing surface is not limited in this application. The number can be zero or any positive integer.

[0055] In this embodiment, the sum of the cross-sectional areas of all the through holes 205 in the stator core 207 is S1, and the sum of the cross-sectional areas of all core modules is S2. S1 and S2 satisfy: 0.01≤S1 / S2≤0.06. Where S1 / S2≥0.01, the refrigerant in the compressor has sufficient channel area to flow through the motor, which is beneficial to improving the compressor's performance. On the other hand, S1 / S2≤0.06 can prevent excessive iron losses in the stator core 207, which would lead to a decrease in motor efficiency.

[0056] like Figure 3 As shown, the through hole 205 is a strip-shaped hole extending along an arc formed with the center point of the cross-section of the stator core 207 as the center. The length of the strip-shaped hole is c, and the width is e, where c and e satisfy: 4 ≤ c / e ≤ 10. The c / e condition being greater than or equal to 4 allows for the easy formation of a refrigerant oil film in the through hole 205. This prevents the vaporized refrigerant oil in the pump body from flowing through the through hole 205 to the upper part of the compressor, thus avoiding affecting pump lubrication and improving compressor performance. Simultaneously, the c / e condition being less than or equal to 10 prevents the refrigerant oil deposited on the upper surface of the stator core near the outer periphery from having poor backflow, which would affect pump lubrication and also improve compressor performance.

[0057] like Figure 3 As shown, the through hole 205 is a strip-shaped hole with a width of e. The minimum distance between the stator slot and the outer peripheral surface of the core module is f. e and f satisfy: 0.1 ≤ e / f ≤ 0.2. The requirement that e / f is greater than or equal to 0.1 prevents the refrigerant oil deposited on the upper surface of the motor core near the outer peripheral edge from flowing back poorly, affecting pump lubrication and improving compressor performance. Simultaneously, the requirement that e / f is less than or equal to 0.2 prevents the stator yoke width from being too small, which could lead to excessive iron loss in the stator core 207 and consequently reduce motor efficiency.

[0058] like Figure 4 As shown, the minimum distance between the through hole 205 and the outer peripheral surface of the core module is g. In this embodiment, g satisfies: 1≤g≤3. This satisfies g≥1, which can improve the strength of the stator core 207 and prevent the stator core 207 from easily deforming after the motor and compressor housing are assembled; on the other hand, satisfying g≤3 is beneficial to allow the refrigerant oil deposited on the upper end face of the stator core near the outer peripheral edge to flow back, ensuring pump lubrication, while avoiding an increase in iron loss of the stator core 207.

[0059] like Figure 4As shown, the minimum distance between the through hole 205 and the splicing surface of the core module is j, and the minimum distance between the through hole 205 and the notch 204 is h. j and g satisfy: 0.35≤j / g≤1.35; h and g satisfy: 0.7≤h / g≤2.7. Wherein, j / g satisfies greater than or equal to 0.35 and / or h / g satisfies greater than or equal to 0.7, which can improve the strength of the stator core 207 and prevent the stator core 207 from being easily deformed after the motor is assembled with the compressor shell. At the same time, j / g satisfies less than or equal to 1.35 and / or h / g satisfies less than or equal to 2.7, so that the magnetic circuit on the stator core 207 is more uniform, which is beneficial to improve the efficiency of the motor.

[0060] As shown in the drawings, Figure 7 As shown in another embodiment of the present application, the through hole 205 is located between the notch 204 and the splicing surface. Among them, at least one through hole 205 is arranged between the notch 204 and one of the splicing surfaces of the punching sheet unit 201, and no through hole 205 is arranged between the notch 204 and the other splicing surface.

[0061] As shown in the drawings, Figure 8 As shown in another embodiment of the present application, the through hole 205 is located between the notch 204 and the splicing surface. One through hole 205 is arranged between the notch 204 and one of the splicing surfaces in each punching sheet unit 201, and two through holes 205 are arranged between the notch 204 and the other splicing surface. Among them, more than two through holes 205 can also be arranged between the notch 204 and the other splicing surface in each punching sheet unit 201.

[0062] It should be noted that the above embodiments only illustrate the number, position, etc. of the through hole. In other embodiments of the present application, other setting parameters are used to set the through hole between the inner periphery of the yoke assembly and the salient pole, which is within the protection scope of the present application. The setting parameters include but are not limited to the number, position, shape and symmetry relationship of the through hole.

[0063] The embodiment of the present application also provides a motor, which comprises a stator assembly, the stator assembly comprises a stator winding and the stator core disclosed in the above embodiments. The detailed structural features and advantages of the stator core can be referred to the description of the above embodiments, which will not be described here.

[0064] As described above, the sum of the cross-sectional areas of all the through holes 205 in the stator core 207 is S1. The stator core 207 is composed of n core modules. A stator winding 209 is wound on each core module. An insulating member 211 is arranged between two adjacent stator windings 209. As shown in the drawings, Figure 5As shown, the thickness of the insulation 211 is t, the maximum slot width of the stator slot in the extension direction of the joint surface is L, and the coil factor is w, which is calculated according to the number of parallel branches of the coil in the stator winding 209 and the size of the enameled wire 210 in the coil. Wherein, S1, n, t, L and w satisfy the condition: 0.3≤S1 / [(w-t)*2*L*n]≤1.3. Wherein, S1 / [(w-t)*2*L*n]≥0.3, which can make the refrigerant in the compressor have sufficient passage area to flow through the motor, and is beneficial to improve the performance of the compressor. On the other hand, S1 / [(w-t)*2*L*n]≤1.3, which can prevent the stator yoke width from being too small, resulting in excessive iron loss of the stator core 207, and further resulting in the decrease of the motor efficiency.

[0065] The number of parallel branches of the coil in each stator winding 209 is m, and m is a positive integer. For example, if the coil in the stator winding is wound by one enameled wire 210, the number of parallel branches is 1. If the coil in the stator winding is wound by two enameled wires 210 in parallel, the number of parallel branches is 2. If the coil in the stator winding is wound by three enameled wires 210 in parallel, the number of parallel branches is 3.

[0066] When the enameled wire 210 in the coil is a round wire, the size of the enameled wire 210 is the diameter of the conductor in the enameled wire 210. The diameter of the conductor in each enameled wire 210 is d, and the coil factor w is calculated according to the following formula: When the enameled wire 210 in the coil is a flat wire, the size of the enameled wire 210 is the length of the long side or the short side of the conductor in the cross section of the enameled wire 210, and the coil factor w is calculated according to the following formula: Wherein, a represents the length of the long side or the short side of the conductor in the cross section of the enameled wire 210. Wherein, the length of the long side is greater than the length of the short side. When the side of the enameled wire 210 in the coil which is in contact with the tooth portion of the stator core is the short side, a represents the length of the long side of the conductor in the cross section of the enameled wire 210. When the side of the enameled wire 210 in the coil which is in contact with the tooth portion of the stator core is the long side, a represents the length of the short side of the conductor in the cross section of the enameled wire 210.

[0067] The embodiment of the present application also provides a compressor, which comprises the motor.

[0068] In summary, the stator core, the motor and the compressor disclosed by the present application at least have the following advantages:

[0069] The stator core, motor and compressor disclosed by the embodiment are characterized in that at least one through hole is arranged between the inner periphery of the yoke component of the punching sheet unit and the salient pole and close to the side of the salient pole, the through holes are communicated after the plurality of punching sheet units are stacked to form a channel for the refrigerant to flow through on the core module, so that the refrigerant can flow through the channel; the channel area for the refrigerant to pass through the motor is increased while the copper loss of the motor is reduced and the efficiency of the motor is improved, which is beneficial to improve the performance of the compressor.

[0070] In the description of the present application, it should be understood that the terms "bottom", "longitudinal", "transverse", "upper", "lower", "front", "rear", "vertical", "horizontal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the referred structure or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, "a plurality of" means two or more, and "several" means one or more.

[0071] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0072] The above is a further detailed description of the present application in combination with specific preferred embodiments, and cannot be considered as limiting the specific implementation of the present application to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, a number of simple deductions or replacements can be made without departing from the concept of the present application, and all should be considered as falling within the protection scope of the present application.

Claims

1. A stator core characterized by, The stator core comprises a ring-shaped yoke formed by splicing a plurality of core modules, and a plurality of tooth portions, each of the core modules being formed by laminating a plurality of lamination units; the lamination unit has a yoke component, a tooth component, and a plurality of salient poles extending outward from the outer periphery of the yoke component in the radial direction of the yoke component, and a concave gap is formed between adjacent two salient poles; At least one through hole is arranged between the inner periphery of the yoke component and the salient poles and close to one side of the salient poles; the through holes of the laminated lamination units are communicated to form a channel for the flow of refrigerant on the core module; The sum of the cross-sectional areas of all the through holes in the stator core is S1, and the sum of the cross-sectional areas of all the core modules is S2, S1 and S2 satisfy: 0.01≤S1 / S2≤0.06; The minimum distance between the through hole and the outer periphery of the core module is g, g satisfies: 1≤g≤3; The through hole is a strip hole, the strip hole extends along a circular arc with the center point of the cross section of the stator core as the center, the length of the strip hole is c, and the width of the strip hole is e, c and e satisfy: 4≤c / e≤10.

2. The stator core of claim 1, wherein Each of the core modules has two splicing surfaces, and a plurality of core modules are spliced by the splicing surfaces to form the stator core; a stator slot is formed between adjacent two tooth portions of the stator core, and the through hole is located between the stator slot and the salient pole.

3. The stator core of claim 2, wherein The through hole is a strip hole, the width of the strip hole is e, the minimum distance between the stator slot and the outer periphery of the core module is f, e and f satisfy: 0.1≤e / f≤0.

2.

4. The stator core of claim 1, wherein The minimum distance between the through hole and the outer periphery of the core module is g, the minimum distance between the through hole and the splicing surface of the core module is j, j and g satisfy: 0.35≤j / g≤1.

35.

5. The stator core of claim 1, wherein The minimum distance between the through hole and the outer periphery of the core module is g, the minimum distance between the through hole and the gap is h, h and g satisfy: 0.7≤h / g≤2.

7.

6. An electric machine comprising a stator assembly, characterized by The stator assembly comprises a stator winding and a stator core as claimed in any one of claims 1-5, the sum of the cross-sectional areas of all the through holes in the stator core is S1, the stator core is composed of n core modules, each of the core modules is wound with a stator winding, an insulating member is arranged between adjacent two stator windings, the thickness of the insulating member is t, the maximum slot width in the extension direction of the splicing surface in the stator slot is L, and the coil factor is w, the coil factor is calculated according to the number of parallel branches of the coil in the stator winding and the size of the enameled wire in the coil; wherein S1, n, t, L and w satisfy the condition: 0.3≤S1 / [(w-t)*2*L*n]≤1.

3.

7. The electric machine of claim 6, wherein, The number of parallel branches of the coil in each of the stator windings is m, m is a positive integer; when the enameled wire in the coil is round wire, the size of the enameled wire is the diameter of the conductor in the enameled wire; the diameter of the conductor in each of the enameled wires is d, and the coil factor is calculated according to the following formula:

8. The electric machine of claim 6, wherein, The number of parallel branches of the coil in each of the stator windings is m, and m is a positive integer; when the enameled wire in the coil is a flat wire, the size of the enameled wire is the length of the long side or the short side of the conductor in the cross section of the enameled wire; the coil coefficient is calculated according to the following formula: Wherein, a represents the length of the long side or the short side of the conductor in the cross section of the enameled wire; when the side of the enameled wire in the coil which is in contact with the tooth part of the stator core is the short side, a represents the length of the long side; when the side of the enameled wire in the coil which is in contact with the tooth part of the stator core is the long side, a represents the length of the short side.

9. A compressor characterized by, The compressor comprises a motor as claimed in any one of claims 6-8.

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