Rotor punching sheet and stator punching sheet on squirrel-cage synchronous motor of refrigerator compressor

Abstract

The utility model relates to the technical field of squirrel-cage synchronous motors, in particular to a rotor punching sheet and a stator punching sheet on a squirrel-cage synchronous motor of a refrigerator compressor, which comprise 24 stator grooves including two special-shaped grooves A and two special-shaped grooves B, two punching sheet yoke parts 1 form a tip structure of the stator punching sheet, and the included angle of the tip end of the rotor groove is set to be 150-165 degrees. According to the technical scheme of the utility model, one side of the stator punching sheet structure adopts the traditional long-edge design, the other side adopts the pointed-end structure, and four of the 24 slots adopt the special-shaped slot design, so that the size rationality of the yoke part of the motor is ensured, the rationality of the magnetic circuit of the motor in design is ensured, the utilization rate of silicon steel of the motor is improved, and the consumption of silicon steel is reduced; the groove-shaped tooth tip parts of the rotor punching sheet are distributed at 150-165 degrees, and on the premise that the tooth width and the groove-shaped length of the rotor are not changed, the cast aluminum volume of the rotor is improved, so that the impedance of the rotor is improved, the magnetic flux density of the rotor is increased, the maximum torque of the motor is improved, and the starting performance of the compressor is improved.

Description

Technical Field

[0001] This utility model relates to the field of squirrel-cage synchronous motor technology, specifically to the rotor laminations and stator laminations of a squirrel-cage synchronous motor for a refrigerator compressor. Background Technology

[0002] The refrigerator compressor industry is fiercely competitive. The development trend in the motor industry is to improve product performance and competitiveness. Traditional squirrel-cage synchronous motors have a 4-hole stator mounting screw hole structure, and the stator laminations are generally square or rectangular. The stator slots are generally round-bottomed or flat-bottomed (e.g., Figure 5 As shown), and the rotor squirrel cage slot is generally a round-bottomed slot (e.g. Figure 6 As shown, structural improvements can be made to increase the utilization rate of silicon steel in motors and reduce the amount of silicon steel used, as well as to improve the volume of cast aluminum rotors. Therefore, we propose rotor laminations and stator laminations for squirrel-cage synchronous motors in refrigerator compressors. Utility Model Content

[0003] The purpose of this invention is to provide rotor laminations and stator laminations for a squirrel-cage synchronous motor in a refrigerator compressor, thereby solving the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a rotor lamination and a stator lamination on a squirrel-cage synchronous motor of a refrigerator compressor. The stator lamination includes a stator central hole located in the center of the stator lamination. Stator lamination yokes are provided on both sides of the top of the stator lamination. The stator lamination has three screw holes arranged in a triangular pattern, one of which is located in the middle of two stator lamination yokes. The surface of the stator lamination has 24 stator slots, including two irregular slots A and B. The two lamination yokes 1 form the pointed structure of the stator lamination.

[0005] Furthermore, both irregular grooves A and B are symmetrically arranged about the vertical center line of the stator lamination, and the irregular grooves A and B on the same side are symmetrically arranged about the horizontal line of the center of the stator hole.

[0006] Furthermore, the external dimensions of the irregular groove A and the irregular groove B are the same, and the end of the irregular groove A that is away from the central hole of the stator is set as an inclined surface.

[0007] Furthermore, the stator core formed by stacking stator laminations can be used in conjunction with the rotor core formed by stacking rotor laminations. The rotor core is located inside the stator core, and the rotor laminations include a shaft hole located in the center of the rotor laminations and rotor slots evenly distributed along the circumference of the rotor laminations.

[0008] Further, the rotor slot is provided with a circular arc shape near one end of the shaft hole, and is provided with a pointed end away from the shaft hole, and the included angle of the pointed end of the rotor slot is 150°-165°.

[0009] Compared with the prior art, the refrigerator compressor squirrel cage synchronous motor has the following beneficial effects:

[0010] 1. The stator lamination structure of the technical scheme adopts a traditional long side shape design on one side and a pointed structure on the other side, and 4 slots in the 24 slots adopt a special-shaped slot design to ensure the rationality of the motor yoke size and the rationality of the motor magnetic circuit in design, improve the utilization rate of the motor silicon steel, and reduce the amount of silicon steel.

[0011] 2. The technical scheme improves the pointed part of the rotor lamination slot tooth part to be distributed at 150°-165°, and the pointed part of the rotor lamination slot tooth part of the ordinary squirrel cage synchronous motor is circular, so that the rotor aluminum volume can be improved without changing the rotor tooth width and the slot shape length, thereby improving the rotor impedance, increasing the rotor flux density, improving the maximum torque of the motor, and improving the starting performance of the compressor. BRIEF DESCRIPTION OF DRAWINGS

[0012] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, made with reference to the accompanying drawings:

[0013] Figure 1 It is a front view of the stator lamination of the refrigerator compressor squirrel cage synchronous motor of the present application;

[0014] Figure 2 It is a schematic view of the stator lamination arrangement of the refrigerator compressor squirrel cage synchronous motor of the present application;

[0015] Figure 3 It is a front view of the rotor lamination of the refrigerator compressor squirrel cage synchronous motor of the present application;

[0016] Figure 4 It is a structural schematic view of the rotor lamination slot of the refrigerator compressor squirrel cage synchronous motor of the present application;

[0017] Figure 5 It is a structural schematic view of the stator lamination of the compressor squirrel cage synchronous motor in the prior art;

[0018] Figure 6 It is a structural schematic view of the rotor lamination of the compressor squirrel cage synchronous motor in the prior art.

[0019] In the figure: 1, stator lamination yoke; 2, stator lamination; 3, special-shaped slot A; 301, special-shaped slot B; 4, rotor lamination; 5, rotor slot; 501, pointed end. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Example 1, such as Figures 1-6 As shown, this utility model provides a technical solution: a rotor lamination and a stator lamination on a squirrel-cage synchronous motor of a refrigerator compressor. The stator lamination 2 includes a stator central hole located in the center of the stator lamination 2. Stator lamination yokes 1 are provided on both sides of the top of the stator lamination 2. The stator lamination 2 has three screw holes arranged in a triangular pattern, one of which is located in the middle of two stator lamination yokes 1. The surface of the stator lamination 2 has 24 stator slots, including two irregular slots A3 and B301. The two stator lamination yokes 1 form the pointed structure of the stator lamination 2. The rotor lamination includes a shaft hole located in the center of the rotor lamination 4 and rotor slots 5 evenly distributed along the circumference of the rotor lamination 4.

[0022] In a specific embodiment of this utility model, a comparison is made. Figure 5 and Figure 1 The stator lamination 2 in this embodiment differs from the stator laminations in the following ways: an inclined surface is provided in the yoke 1 of the stator lamination, and the number of fixing screw holes is reduced from four to three. One end of the stator lamination 2 is a pointed end, and the other end is either straight or rectangular. The bottom shape of the slot of the stator lamination 2 is also changed from the conventional circular or flat shape to an irregular shape (such as an inclined surface). Four of the 24 slots in the stator lamination 2 (such as irregular slot A3 and irregular slot B301) adopt an irregular slot design, ensuring the rationality of the motor yoke dimensions. The stator lamination layout diagram of this application is as follows: Figure 2 As shown, this can improve the utilization rate of silicon steel in motors, reduce the amount of silicon steel used, reasonably increase the size of the motor yoke, reduce motor electromagnetic saturation, reduce motor magnetic flux density, and increase motor efficiency.

[0023] contrast Figure 6 and Figure 3 The rotor lamination 4 in this embodiment differs from the rotor laminations in the prior art in that the tooth tips of the rotor lamination slots are distributed at 150-165 degrees, while the tooth tips of ordinary squirrel-cage synchronous motor rotor laminations are circular. The improved rotor tooth tip distribution at 150-165 degrees can increase the rotor aluminum volume without changing the rotor tooth width and slot length, thereby increasing the rotor impedance, increasing the rotor magnetic flux density, increasing the maximum torque of the motor, and improving the compressor starting performance.

[0024] In the preferred technical solution, the two profile grooves A3 and profile grooves B301 are symmetrically arranged about the vertical center line of the stator lamination 2, and the profile grooves A3 and profile grooves B301 on the same side are symmetrically arranged about the horizontal center line of the stator hole.

[0025] In the preferred technical solution, the profile grooves A3 and profile grooves B301 have the same size, and the end of the profile grooves A3 away from the stator hole is arranged as an inclined surface. The profile groove design ensures the rationality of the size of the motor yoke.

[0026] In the preferred technical solution, the end of the rotor slot 5 close to the shaft hole is arranged as a circular arc, and the end of the rotor slot 5 away from the shaft hole is arranged as a pointed end 501. The included angle of the pointed end 501 of the rotor slot 5 is arranged as 150°-165°. Without changing the rotor tooth width and the length of the slot shape, the volume of the rotor cast aluminum is increased, thereby improving the rotor impedance, increasing the rotor flux density, improving the maximum torque of the motor, and improving the starting performance of the compressor.

[0027] In summary, the embodiment provides a stator lamination yoke 1 with an inclined surface, and the number of screw holes for fixing is reduced from 4 to 3. One end of the stator lamination 2 is a pointed end, and the other end is a positive direction or a rectangular shape. The slot bottom shape of the stator lamination 2 is also changed from the conventional circular or planar shape to a profiled stator lamination. The rotor lamination slot shape tooth is arranged as a pointed part with an included angle of 150-165 degrees. Therefore, the silicon steel utilization rate of the motor is improved, the amount of silicon steel is reduced, the size of the motor yoke can be reasonably increased, the electromagnetic saturation of the motor is reduced, the motor flux density is increased, the motor efficiency is improved, the rotor impedance is improved without changing the rotor tooth width and the length of the slot shape, the rotor flux density is increased, the maximum torque of the motor is improved, and the starting performance of the compressor is improved.

Claims

1. A stator lamination for a squirrel cage synchronous motor of a refrigerator compressor, comprising a stator lamination (2), a stator hole (3) located in the middle of the stator lamination (2), characterized in that: The stator punching sheet (2) is provided with stator punching sheet yoke (1) on both sides of the top, the stator punching sheet (2) is provided with three screw holes in triangular distribution, one of which is located in the middle position of the two stator punching sheet yoke (1), the surface of the stator punching sheet (2) is provided with 24 stator slots, 24 stator slots include two special groove A (3) and special groove B (301), two stator punching sheet yoke (1) constitute the sharp structure of stator punching sheet (2).

2. A stator lamination for a refrigerator compressor squirrel cage synchronous motor as set forth in claim 1, characterized in that: Two special groove A (3), special groove B (301) are about stator punching sheet (2) vertical center line left and right symmetrically arranged, the same side of the special groove A (3) and special groove B (301) are about the stator hole center horizontal line symmetrically arranged.

3. The stator lamination for a refrigerator compressor squirrel cage synchronous motor of claim 2, wherein: The special groove A (3) and special groove B (301) are consistent in size, and the end of the special groove A (3) away from the stator hole is provided as an inclined surface.

4. A rotor lamination for a squirrel cage synchronous motor of a refrigerator compressor, the stator core formed by stacking the stator laminations (2) of claim 1 is used in cooperation with a rotor core formed by stacking rotor laminations (4), the rotor core being disposed within the stator core, characterized in that: Including the rotor punching sheet (4) is provided with the shaft hole in the middle, the rotor slot (5) is uniformly distributed along the circumferential direction of the rotor punching sheet (4).

5. The rotor lamination on a refrigerator compressor squirrel cage synchronous motor according to claim 4, characterized in that: The end of the rotor slot (5) close to the shaft hole is provided as a circular arc, the end of the rotor slot (5) away from the shaft hole is provided as a sharp end (501), and the included angle of the sharp end (501) of the rotor slot (5) is 150°~165°.

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