Low-voltage small-center high permanent magnet synchronous motor rotor structure

Abstract

The utility model discloses a rotor structure of a low-voltage small-center high permanent magnet synchronous motor. The rotor structure comprises a rotating shaft, a rotor iron core, magnetic steel, a pressing baffle plate and an arc key, the rotating shaft comprises a flat key and an arc key groove. The rotor iron core comprises a first flat key groove and a magnetic steel groove; the pressing baffle comprises a penetrating groove, a second flat key groove and a third flat key groove, when the second flat key groove is matched with the flat key, the penetrating groove is communicated with the magnetic steel groove, and the magnetic steel penetrates through the penetrating groove to be installed in the magnetic steel groove; when the third flat key grooves are matched with the flat keys, the pressing baffles shield the magnetic steel grooves, the arc keys are matched in the arc key grooves, the pressing baffles are pressed on the rotor iron core, the rotor structure is high in structural stability, low in cost, simple in structure, convenient to assemble and high in product consistency, and the use performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of permanent magnet motors, in particular to a rotor structure of a low-voltage, small-center, high-permanent magnet synchronous motor. Background Art

[0002] Permanent magnet synchronous motors (PMSMs) are increasingly used in many fields due to their simple structure, compact size, high efficiency, and excellent power performance. However, the presence of permanent magnets necessitates significant differences in the machining process, assembly methods, and tooling used for their rotor structures. To improve the performance, stability, and consistency of PMSMs, as well as enhance production efficiency, manufacturers are continuously striving to refine and improve these processes.

[0003] The rotor structure of a common permanent magnet synchronous motor generally includes a rotating shaft, a rotor core, a magnet, a first magnetic pole pressure plate, a second magnetic pole pressure plate, a first laminate, a second laminate, a first baffle, and a second baffle. The first magnetic pole pressure plate and the second magnetic pole pressure plate are assembled at both ends of the rotor core, and the first magnetic pole pressure plate and the second magnetic pole pressure plate are both configured to assemble the magnets into the through-slots in the rotor core. After the magnets are assembled, the first laminate and the second laminate are respectively filled into the through-slots of the first magnetic pole pressure plate and the second magnetic pole pressure plate, and then fixed to the first magnetic pole pressure plate with screws through the first baffle, and fixed to the second magnetic pole pressure plate with screws through the second baffle, thereby achieving the installation of the magnets. However, the rotor structure has many parts, relatively poor stability, and is not conducive to reducing costs. Utility Model Content

[0004] The purpose of the utility model is to provide a low-voltage small-center high-permanent-magnet synchronous motor rotor structure.

[0005] In order to achieve the above-mentioned purpose of the utility model, the utility model adopts the following technical solutions: a low-voltage small-center high-permanent-magnet synchronous motor rotor structure, which includes

[0006] A rotating shaft comprising an axially extending flat key and an arc keyway located at one end of the flat key;

[0007] a rotor core, which is sleeved on the rotating shaft, the rotor core comprising a first flat keyway and a magnetic steel slot, wherein the first flat keyway cooperates with the flat key;

[0008] a magnetic steel assembled in the magnetic steel slot;

[0009] A pressure baffle plate, comprising a through slot, a second flat key slot, and a third flat key slot. The pressure baffle plate is located at one end of the rotor core adjacent to the arc key slot. The second flat key slot and the third flat key slot are both used to cooperate with the flat key. When the second flat key slot cooperates with the flat key, the through slot communicates with the magnetic steel slot, and the magnetic steel passes through the through slot and is installed in the magnetic steel slot.

[0010] Arc key, when the third flat key slot is matched with the flat key, the pressure baffle blocks the magnetic steel slot, the arc key is matched in the arc key slot and the pressure baffle is pressed onto the rotor core.

[0011] As a further improved technical solution of the utility model, it also includes:

[0012] a baffle plate comprising a fourth flat keyway matched with the flat key;

[0013] The rotating shaft further includes a shaft stop located at the other end of the flat key, and the stop plate abuts against the other end of the rotor core and is limited to the shaft stop;

[0014] As a further improved technical solution of the present invention, the pressure baffle also includes an annular plate body and an axial hole formed by the plate body, the through grooves are evenly distributed along the circumference of the plate body, and the second flat keyway and the third flat keyway are further recessed from the axial hole.

[0015] As a further improved technical solution of the present invention, the plurality of through grooves are distributed in a V-shape in pairs.

[0016] As a further improved technical solution of the present invention, the magnetic steel is rectangular, and the through slot is also rectangular to match it.

[0017] As a further improved technical solution of the present invention, the size of the magnetic steel is a*b, and the size of the through slot is (a+2mm)*(b+2mm).

[0018] As a further improved technical solution of the present invention, the second flat keyway and the third flat keyway are distributed along the circumference of the shaft hole and the difference between them is greater than or equal to 30°.

[0019] As a further improved technical solution of the present invention, the retaining plate further includes an annular base plate and a second axial hole formed by the annular base plate, and the fourth flat keyway is further recessed from the second axial hole.

[0020] As a further improved technical solution of the present invention, the pressure baffle is a stainless steel plate.

[0021] The beneficial effects of the present invention are as follows: the pressure baffle is provided with a second flat keyway and a third flat keyway. The second flat keyway is used to cooperate with the through-slot installation of the magnetic steel 3, and the third flat keyway is used to shield the baffle from the magnetic steel and fix the rotor core. The pressure baffle serves the functions of the magnetic steel baffle, laminate, baffle and screw in the prior art, installs the magnetic steel, limits the magnetic steel, and supports the end. It has high structural stability, low cost, simple structure, convenient assembly, strong product consistency, and improved performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of a low-voltage, small-center, high-intensity permanent magnet synchronous motor rotor structure of the utility model;

[0023] Figure 2 This is a structural diagram of a pressure baffle of a low-voltage, small-center, high-permanent-magnet synchronous motor rotor structure of the utility model;

[0024] Figure 3 The utility model is a structural schematic diagram of a retaining plate of a low-voltage small-center high-permanent-magnet synchronous motor rotor structure. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below with reference to the various embodiments shown in the accompanying drawings. The drawings illustrate preferred embodiments of the present invention. However, it should be noted that these embodiments are not intended to limit the present invention, and any equivalent functional, methodological, or structural modifications or substitutions made by persons of ordinary skill in the art based on these embodiments fall within the scope of protection of the present invention.

[0026] Please refer to Figures 1 to 3 The utility model discloses a low-voltage small-center high-permanent magnet synchronous motor rotor structure 100, which includes a rotating shaft 1, a rotor core 2, a magnetic steel 3, a pressure baffle 4, an arc key 5 and a baffle 6.

[0027] The rotating shaft 1 includes an axially extending flat key 11, an arc keyway 12 located at one end of the flat key 11, and a shaft stop 13 located at the other end of the flat key 11. The rotor core 2 is sleeved on the rotating shaft 1. The rotor core 2 includes a first flat keyway 21 and a magnetic steel slot 22. The first flat keyway 21 cooperates with the flat key 11, and the rotor core 2 rotates synchronously with the rotating shaft 11. The magnetic steel 3 is assembled in the magnetic steel slot 22. The pressure baffle 4 includes a through slot 41, a second flat keyway 42 and a third flat keyway 43. The pressure baffle 4 is located at one end of the rotor core 2 adjacent to the arc keyway 12. The second flat keyway 42 and the third flat keyway 43 are both used to cooperate with the flat key 11. When the second flat keyway 42 cooperates with the flat key 11, the through slot 41 is connected to the magnetic steel slot 22, and the magnetic steel 3 is installed in the magnetic steel slot 22 through the through slot 41. When the third flat keyway 43 engages with the flat key 11, the pressure plate 4 blocks the magnetic steel slot 22. The arc key 5 engages within the arc keyway 12, pressing the pressure plate 4 against the rotor core 2. The pressure plate 4 is provided with a second flat keyway 42 and a third flat keyway 43. The second flat keyway 42 is used to engage the through slot 41 to install the magnetic steel 3, while the third flat keyway 43 is used to block the plate 4 from the magnetic steel 3 and secure the rotor core 2. The pressure plate 4 performs the functions of a magnetic steel baffle, laminate, baffle, and screw mounting magnet, magnetic limiter, and end stop in the prior art. It offers high structural stability, low cost, simple structure, easy assembly, strong product consistency, and improved performance.

[0028] The retaining plate 6 includes a fourth flat keyway 61 that cooperates with the flat key 11. The retaining plate 6 is retained at the other end of the rotor core 2 and is limited to the shaft stop 13. The retaining plate 6 does not need to be provided with a through groove for installing the magnetic steel 3, and is pressed and retained at one end of the rotor core 2 adjacent to the shaft stop 13. The retaining plate 6 can replace components such as magnetic steel baffles, baffles and screws, and has a simple structure, easy assembly and high structural stability, which reduces costs and improves performance. In other embodiments, the shaft stop 13 can also be replaced by an arc keyway 12, and correspondingly, the retaining plate 6 can be replaced by a pressure baffle.

[0029] Furthermore, the pressure baffle 4 also includes an annular plate body 44 and an axial hole 45 formed by the plate body 44. The through grooves 41 are evenly distributed on the plate body 44 along the circumference, and the second flat key groove 42 and the third flat key groove 43 are further recessed from the axial hole 45. A plurality of through grooves 41 are distributed in a V shape. The magnet 3 is rectangular, and the through grooves 41 are also in a matching rectangular shape. The size of the magnet 3 is a*b, and the size of the through groove 41 is (a+2mm)*(b+2mm). The angle between each two through grooves 41 forming the V shape is 135°-155°, for example, 149°. The second flat key groove 42 and the third flat key groove 43 are distributed along the circumference of the axial hole 45 and the difference is greater than or equal to 30°.

[0030] The retaining plate 6 further includes an annular base plate 62 and a second shaft hole 63 formed by the base plate 62 . The fourth flat key groove 61 is further recessed from the second shaft hole 63 .

[0031] During assembly, the baffle plate 6 is sleeved on the rotating shaft 1 and fixed with the flat key 11 through the fourth flat keyway 61, and the rotor core 2 is sleeved on the rotating shaft 1 and fixed with the flat key 11 through the first flat keyway 21. When the magnet 3 is inserted, because the magnet 3 has a large magnetic force, in order to protect the magnet 3 and facilitate installation, the pressure baffle plate 4 is a stainless steel plate. The second flat keyway 42 of the pressure baffle plate 4 is first matched with the flat key 11, and the through slot 41 is matched and connected with the magnet slot 22. The magnet 3 is assembled in the magnet slot 22 through the through slot 41. After the magnet 3 is assembled, the pressure baffle plate 4 is rotated by an angle so that the third keyway 43 is inserted on the flat key 11. In this way, the through slot 41 of the pressure baffle plate 4 and the magnet 3 can be staggered, thereby realizing the function of preventing the axial movement of the magnet 3.

[0032] The utility model provides a low-voltage small-center high permanent magnet synchronous motor rotor structure 100, which replaces the existing first magnetic pole pressure plate, second magnetic pole pressure plate, first laminate, second laminate, first baffle, second baffle and fastening screws by arranging new pressure baffles 4 and retaining plates 6 on both sides of the rotor core 2. The structure has high stability, low cost, simple structure, easy assembly, strong product consistency and improved performance.

[0033] It should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation method can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0034] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A low-voltage small-center high-permanent-magnet synchronous motor rotor structure, characterized in that: It comprises a rotating shaft, which comprises an axially extending flat key and an arc keyway located at one end of the flat key; a rotor core, which is sleeved on the rotating shaft, the rotor core comprising a first flat keyway and a magnetic steel slot, wherein the first flat keyway cooperates with the flat key; a magnetic steel assembled in the magnetic steel slot; A pressure baffle plate, comprising a through slot, a second flat key slot, and a third flat key slot. The pressure baffle plate is located at one end of the rotor core adjacent to the arc key slot. The second flat key slot and the third flat key slot are both used to cooperate with the flat key. When the second flat key slot cooperates with the flat key, the through slot communicates with the magnetic steel slot, and the magnetic steel passes through the through slot and is installed in the magnetic steel slot. Arc key, when the third flat key slot is matched with the flat key, the pressure baffle blocks the magnetic steel slot, the arc key is matched in the arc key slot and the pressure baffle is pressed onto the rotor core.

2. The low-voltage small-center high-permanent-magnet synchronous motor rotor structure according to claim 1 is characterized in that: Also includes: a baffle plate comprising a fourth flat keyway matched with the flat key; The rotating shaft further includes a shaft stop platform located at the other end of the flat key, and the stop plate abuts against the other end of the rotor core and is limited to the shaft stop platform.

3. The low-voltage small-center high-permanent-magnet synchronous motor rotor structure according to claim 1 is characterized in that: The pressure baffle further includes an annular plate body and an axial hole formed by the plate body. The through grooves are evenly distributed on the plate body along the circumference. The second flat keyway and the third flat keyway are further recessed from the axial hole.

4. The low-voltage small-center high-permanent-magnet synchronous motor rotor structure according to claim 3 is characterized in that: The plurality of through grooves are distributed in a V shape in pairs.

5. The low-voltage small-center high-permanent-magnet synchronous motor rotor structure according to claim 3 is characterized in that: The magnetic steel is rectangular, and the through slot is also in a matching rectangular shape.

6. The low-voltage small-center high-permanent-magnet synchronous motor rotor structure according to claim 5 is characterized in that: The size of the magnetic steel is a*b, and the size of the slot is (a+2mm)*(b+2mm).

7. The low-voltage small-center high-permanent-magnet synchronous motor rotor structure according to claim 3 is characterized in that: The second flat keyway and the third flat keyway are distributed along the circumference of the shaft hole and have a difference of greater than or equal to 30°.

8. The low-voltage small-center high-permanent-magnet synchronous motor rotor structure according to claim 2 is characterized in that: The retaining plate further includes an annular base plate and a second axial hole formed by the base plate, and the fourth flat keyway is further recessed from the second axial hole.

9. The low-voltage small-center high-permanent-magnet synchronous motor rotor structure according to claim 1, characterized in that: The pressure baffle is a stainless steel plate.

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