Single-phase induction motor stator punching sheet structure and compressor thereof
By designing a 28-slot single-phase induction motor stator punching structure, using alternatingly arranged large and small groove groups, the size and proportion of stator punching sheets are optimized, and the problem of uneven magnetic circuits is solved, achieving more efficient motor performance and lower cost.
Patent Information
- Application Number
- CN202311525447.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-16
- Publication Date
- 2025-05-16
AI Technical Summary
The existing single-phase induction motor stator punching design is difficult to achieve optimal coordination of the magnetic circuit, resulting in uneven magnetic density distribution, increasing iron loss and excitation current, and the optimization parameters are numerous and complex, making it difficult to achieve the optimal combination.
A single-phase induction motor stator punching structure is designed, with the number of stator grooves of 28 grooves, including large and small groove groups arranged alternately. By reasonably allocating the stator punching size and corresponding proportions, the magnetic flux density distribution is optimized to make it more uniform.
By optimizing the magnetic flux density distribution, the stator iron loss is reduced, the excitation current is reduced, the motor efficiency is improved, and the current is reduced, while maintaining the maximum torque, starting torque and rotation speed of the motor are comparable to that of the original motor.
Smart Images
Figure CN120016719A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of compressor motors, and in particular to a single-phase induction motor stator punching structure and a compressor thereof. Background Art
[0002] The single-phase induction motor is an asynchronous motor with simple control, easy installation and maintenance, and strong self-starting ability. It is a single-phase AC motor and is mainly used to drive small household appliances.
[0003] When designing the stator laminations of a compressor single-phase induction motor, it is necessary to comprehensively consider the inner / outer diameter size, ratio, number of slots, slot area, and overall dimensions to achieve the best match of the magnetic circuit. At the same time, the cost needs to be as low as possible. Since it is often necessary to optimize for multiple units and there are many optimization parameters, it is often impossible to achieve the optimal combination. Summary of the invention
[0004] In view of the problems in the prior art, the object of the present invention is to provide a single-phase induction motor stator punching structure and a compressor thereof with optimized magnetic circuit and improved efficiency.
[0005] According to one aspect of the present invention, a single-phase induction motor stator sheet structure is provided, wherein the number of stator slots is 28, the stator sheet comprises alternating large slot groups and small slot groups, each large slot group comprises 10 large slots, each small slot group comprises 4 small slots, the stator sheet corresponding to the small slot group has a small slot cut edge, and at least one pair of large slot cut edges is provided between the two small slot cut edges, the two small slot cut edges and the two large slot cut edges are symmetrically arranged about the central axis of the stator sheet, the spacing between the two parallel small slot cut edges is L1, the spacing between the two parallel large slot cut edges is L2, and the spacing between the two parallel large slot cut edges is L3. <L1 / L2<0.98。
[0006] Preferably: the maximum outer diameter of the stator punching sheet is D1, 0.92 <L1 / D1<0.96。
[0007] Preferably: the inner diameter of the stator punching sheet is D2, 0.52 <D2 / L1<0.56。
[0008] Preferably, the included angle between the cutting edge of the small groove and the cutting edge of the adjacent large groove is θ, and 118°≤θ≤121°.
[0009] Preferably, the diameter of the circle tangent to the top of the large slot is D3, and the inner diameter of the stator punching sheet is D2, which satisfies: 1.41 <D3 / D2<1.47。
[0010] Preferably, the diameter of the circle tangent to the top of the small slot is D4, and the inner diameter of the stator punching sheet is D2, which satisfies: 1.36 <D4 / D2<1.42。
[0011] Preferably: the area of the large groove is S1, the area of the small groove is S2, 1.15 <S1 / S2<1.19。
[0012] Preferably, two pairs of large slot cutting edges are provided between the two small slot cutting edges, the two large slot cutting edges are symmetrically arranged about the central axis of the stator punching sheet, and the two large slot cutting edges of each pair of large slot cutting edges are symmetrically arranged about the central axis of the stator punching sheet.
[0013] According to another aspect of the present invention, a compressor is provided, comprising the above-mentioned single-phase induction motor stator punching structure.
[0014] A single-phase induction motor stator punching structure and a compressor thereof of the present invention reasonably distribute the stator punching sheet size and the corresponding proportion, so that the magnetic flux density distribution of the stator yoke is more uniform, and the stator iron loss caused by the uneven magnetic flux distribution is reduced. At the same time, the excitation current of the motor can also be reduced, and the amount of steel plate material is optimized, which can significantly improve the motor efficiency and reduce the current, and at the same time keep the maximum torque, starting torque, rotation speed, etc. of the motor equivalent to those of the original motor. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Other features, objectives and advantages of the present invention will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.
[0016] Figure 1 1 is a schematic structural diagram of a stator punching structure of a single-phase induction motor according to an embodiment of the present invention;
[0017] Figure 2 It is a schematic diagram of the structure of the large slot and the small slot of an embodiment of the present invention;
[0018] Figure 3 It is a schematic diagram of the structure of the punching sheet of comparative example 1.
[0019] Reference numerals
[0020] 1 large slot
[0021] 2 small slots
[0022] 3 small groove cutting edge
[0023] 4 large groove cutting edges
[0024] 5 Stator punching of comparative example 1 DETAILED DESCRIPTION
[0025] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar structures, and thus their repetitive description will be omitted.
[0026] As Figure 1 and Figure 2 shown in, in an embodiment of the present invention, a stator punching structure of a single-phase induction motor and a compressor including the same are provided.
[0027] The compressor is preferably a refrigeration compressor, including a single-phase induction motor, including a stator punching.
[0028] The number of stator slots is 28. The stator punching includes an alternately arranged large slot group and a small slot group. Each large slot group includes 10 large slots 1, and each small slot group includes 4 small slots 2. The outer shape of the stator punching corresponding to the small slot group has a small slot cutting edge 3, and at least a pair of large slot cutting edges 4 are further provided between two small slot cutting edges 3. The two small slot cutting edges 3 and the two large slot cutting edges 4 are symmetrically arranged about the central axis of the stator punching. The distance between two parallel small slot cutting edges 3 is L1, and the distance between two parallel large slot cutting edges 4 is L2, 0.96 < L1 / L2 < 0.98.
[0029] A stator punching structure of a single-phase induction motor and its compressor according to an embodiment of the present invention rationally allocate the stator punching size and the corresponding ratio, making the magnetic flux density distribution in the stator yoke more uniform and the cost lower, thereby improving the motor efficiency.
[0030] As Figure 1 shown in, in an embodiment of the present invention, it is preferred that the maximum outer diameter of the stator punching is D1, 0.92 < L1 / D1 < 0.96.
[0031] And it is preferred that the inner diameter of the stator punching is D2, 0.52 < D2 / L1 < 0.56, making the magnetic flux density distribution in the stator yoke more uniform.
[0032] In addition, as Figure 1 shown in, in an embodiment of the present invention, it is preferred that the angle between the small slot cutting edge 3 and the adjacent large slot cutting edge 4 is θ, 118° ≤ θ ≤ 121°, making the magnetic flux density distribution in the stator yoke more uniform.
[0033] In addition, as Figure 1 and Figure 2As shown in [the figure], in the embodiment of the present invention, it is preferably that the diameter of the circle tangent to the top of the large slot 1 is D3, and the inner diameter of the stator punching is D2, satisfying: 1.41 < D3 / D2 < 1.47. And it is preferably that the diameter of the circle tangent to the top of the small slot 2 is D4, and the inner diameter of the stator punching is D2, satisfying: 1.36 < D4 / D2 < 1.42, so as to make the magnetic flux density distribution in the stator yoke more uniform.
[0034] As Figure 2 shown in [the figure], in the embodiment of the present invention, it is preferably that the area of the large slot is S1, and the area of the small slot is S2, 1.15 < S1 / S2 < 1.19, so as to make the magnetic flux density distribution in the stator yoke more uniform.
[0035] Another Figure 1 as shown in [the figure], it is preferably that there are two pairs of large slot edges 4 between the cutting edges 3 of the two small slots. The two large slot edges 4 are symmetrically arranged about the central axis of the stator punching, and the two large slot edges of each pair of large slot edges 4 are symmetrically arranged about the central axis of the stator punching, so as to make the magnetic flux density distribution in the stator yoke more uniform.
[0036] Control experiment:
[0037] As Figure 3 shown in [the figure], the stator punching 5 of Comparative Example 1 is a stator punching with 28 large slots without cutting edges, and the inner and outer diameters and the large slot diameter are the same as those in the embodiment of the present invention.
[0038] Under the same working conditions and by selecting the dimensional values within the range of the embodiment of the present invention, the average operation and efficiency results of Comparative Example 1 and the embodiment of the present invention are as shown in Table 1 below.
[0039] Table 1: Average operation and efficiency results
[0040] Example 1 Comparative Example 1 efficiency(%) 89.85 88.80 Speed (rpm) 3501 3498 Current (A) 10.63 10.79 Maximum torque (N*m) 16.65 16.64 Starting torque (N*m) 2.10 2.11
[0041] As shown in Table 1 above, compared with Comparative Example 1, the embodiment of the present invention significantly improves the motor efficiency and reduces the current. At the same time, the maximum torque, starting torque, speed, etc. of the motor are also comparable to those of Comparative Example 1.
[0042] In summary, the technical solution of the embodiment of the present invention reasonably distributes the number and positions of the large and small slots, and the corresponding ratios among the stator inner and outer diameters D1 / D2, slot areas S1 / S2, cutting edge dimensions L3 / L4 and included angle θ, etc., so as to make the magnetic flux density distribution in the stator yoke more uniform, reduce the stator iron loss caused by uneven magnetic density distribution, and at the same time can also reduce the excitation current of the motor. The cutting edges L3 / L4 cooperate with the corresponding included angle θ, and the steel plate material usage can also be optimized, ensuring a lower enameled wire and steel plate usage.
[0043] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.
Claims
1. A single-phase induction motor stator punching structure, characterized in that: The number of stator slots is 28. The stator punching sheet includes large slot groups and small slot groups arranged alternately. Each large slot group includes 10 large slots, and each small slot group includes 4 small slots. The stator punching sheet corresponding to the small slot group has a small slot cutting edge, and at least one pair of large slot cutting edges is provided between the two small slot cutting edges. The two small slot cutting edges and the two large slot cutting edges are symmetrically arranged about the central axis of the stator punching sheet. The spacing between the two parallel small slot cutting edges is L1, and the spacing between the two parallel large slot cutting edges is L2, 0.96 <L1 / L2<0.98。 2. The single-phase induction motor stator punching structure according to claim 1, characterized in that: The maximum outer diameter of the stator punching sheet is D1, 0.92 <L1 / D1<0.96。 3. The single-phase induction motor stator punching structure according to claim 1, characterized in that: The inner diameter of the stator punching sheet is D2, 0.52 <D2 / L1<0.56。 4. The single-phase induction motor stator punching structure according to claim 1, characterized in that: The included angle between the cutting edge of the small groove and the cutting edge of the adjacent large groove is θ, and 118°≤θ≤121°.
5. The single-phase induction motor stator punching structure according to claim 1, characterized in that: The diameter of the circle tangent to the top of the large slot is D3, and the inner diameter of the stator punching sheet is D2, which satisfies: 1.41 <D3 / D2<1.47。 6. The single-phase induction motor stator punching structure according to claim 1, characterized in that: The diameter of the circle tangent to the top of the small slot is D4, and the inner diameter of the stator punching sheet is D2, which satisfies: 1.36 <D4 / D2<1.42。 7. The single-phase induction motor stator punching structure according to claim 1, characterized in that: The area of the large groove is S1, the area of the small groove is S2, 1.15 <S1 / S2<1.19。 8. The single-phase induction motor stator punching structure according to any one of claims 1 to 7, characterized in that: Two pairs of large slot cutting edges are arranged between the two small slot cutting edges, the two large slot cutting edges are symmetrically arranged about the central axis of the stator punching sheet, and the two large slot cutting edges of each pair of large slot cutting edges are symmetrically arranged about the central axis of the stator punching sheet.
9. A compressor, characterized in that: The invention comprises a single-phase induction motor stator punching structure as described in any one of claims 1 to 7.
10. A compressor, characterized in that: It comprises the single-phase induction motor stator punching structure according to claim 8.