Stator shaft capable of bearing torque and having good heat dissipation effect

Abstract

The application discloses a stator shaft capable of bearing torque and having good heat dissipation effect, and relates to the technical field of a stator core shaft of a permanent magnet synchronous motor. The stator shaft is a variable cross-section box beam structure, a large cross-section is used for transmitting torque, and a small cross-section is used for bearing load. The stator shaft comprises an upper cover plate, a right web plate, a lower cover plate and a left web plate. The upper cover plate, the right web plate, the lower cover plate and the left web plate are combined into a back-shaped structure, and a plurality of reinforcing ribs are symmetrically arranged on the outer side of the back-shaped structure. A stator core is fixedly installed on the reinforcing ribs. The application considers that the stator shaft not only bears torque but also bears load in a vertical downward direction. Therefore, the stator shaft is a variable cross-section box shaft, a large cross-section is used for a stator assembly position, and a small cross-section is used for a bearing assembly position, so as to reduce the bending deformation and torsional deformation of the stator shaft. The design of a large-area cooling channel on the stator shaft not only reduces the self weight of the mechanism, improves heat dissipation efficiency, but also achieves the purpose of reducing the overall cost.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of stator core shaft of permanent magnet synchronous motor, and particularly relates to a stator shaft with good load transmission and heat dissipation effect. BACKGROUND

[0002] The driving motor of the crane is an inner rotor winding type asynchronous motor for long-term application. Since 2014, the outer rotor permanent magnet synchronous motor has been widely applied in the crane equipment and conveying machinery industry. The permanent magnet synchronous motor has the characteristics of small size, light weight and good energy saving effect, and is deeply loved by the majority of users. However, the permanent magnet synchronous motor is limited by the price and performance of the permanent magnet material, resulting in a high one-time purchase cost. The permanent magnet synchronous motor is applied to some working conditions with heavy weight, and the output torque of the conventional shaft is changed to the output torque of the motor base. At the same time, the motor base also needs to bear the vertical load. This is a huge change from the stress mode of the conventional motor shaft which only transmits torque. In order to meet the demand of various stresses, improve the heat dissipation efficiency and reduce the use of permanent magnet material, the present application has the innovative design. SUMMARY

[0003] In order to solve the defects and problems of the prior art, the purpose of the present application is to provide a stator shaft with good load transmission and heat dissipation effect, which has the advantages of simple structure, reasonable design and convenient use. Through the design of the large-area cooling channel, the self-weight of the mechanism is reduced, the heat dissipation efficiency is improved, and the overall cost is reduced.

[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: it includes a stator shaft with a variable cross-section box beam structure, a large cross-section for transmitting torque and a small cross-section for bearing load. The stator shaft comprises an upper cover plate, a right web plate, a lower cover plate and a left web plate. The upper cover plate, the right web plate, the lower cover plate and the left web plate are combined into a back type structure, and a plurality of reinforcing ribs are symmetrically arranged on the outer side of the back type structure. The stator core is fixedly installed on the reinforcing ribs.

[0005] As a preferred embodiment, the rectangular cavity in the middle of the stator shaft and the side cavity formed by the stator shaft and the stator core are cooling channels.

[0006] As a preferred embodiment, the total area of the rectangular cavity and the side cavity is greater than the total area of the reinforcing ribs in contact with the stator shaft and the stator core.

[0007] As a preferred embodiment, the contact area ratio of the side cavity to the stator core is greater than 70%.

[0008] As a preferred embodiment, the cooling mode of the cooling channel is preferably forced air cooling, but is not limited to air cooling, and can be oil cooling, water cooling, etc. Considering various cooling modes, various cooling pipes can be laid in the cooling channel.

[0009] As a preferred embodiment, the thickness of the upper cover plate is greater than the thickness of the lower cover plate.

[0010] Preferably, the number of the reinforcing ribs is 2-8.

[0011] Compared with the prior art, the application has the advantages that the stator shaft is designed as a box-shaped shaft with variable cross-section, the large cross-section is the stator assembly position, and the small cross-section is the bearing assembly position, so as to reduce the bending deformation and torsional deformation of the stator shaft, the large-area cooling channel on the stator shaft not only reduces the self-weight of the mechanism and improves the heat dissipation efficiency, but also achieves the purpose of reducing the overall cost. BRIEF DESCRIPTION OF DRAWINGS

[0012] For ease of illustration, the application is described in detail by the following specific embodiments and drawings.

[0013] Figure 1 The figure is a structural schematic diagram of the application;

[0014] Figure 2 The figure is a front view of the application.

[0015] In the figure: stator shaft 10, stator core 20, upper cover plate 1, right web plate 2, lower cover plate 3, left web plate 4, reinforcing rib 5, rectangular cavity 6, side cavity 7. DETAILED DESCRIPTION

[0016] To make the purpose, technical scheme and advantages of the application more clear and obvious, the application is described below by the specific embodiments shown in the drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the application. In addition, in the following description, the description of the known structures and technologies is omitted to avoid unnecessary confusion of the concept of the application.

[0017] Here, it should also be noted that, in order to avoid obscuring the application due to unnecessary details, only the structures and / or processing steps closely related to the scheme according to the application are shown in the drawings, and other details not closely related to the application are omitted.

[0018] As Figure 1 , Figure 2 shown, the present embodiment adopts the following technical scheme: it includes a stator shaft 10 which is a box-shaped beam structure with variable cross-section, the large cross-section transmits torque, and the small cross-section bears load, the stator shaft 10 includes an upper cover plate 1, a right web plate 2, a lower cover plate 3 and a left web plate 4; the upper cover plate 1, the right web plate 2, the lower cover plate 3 and the left web plate 4 are combined into a back-shaped structure, a plurality of reinforcing ribs 5 are symmetrically arranged on the outside of the back-shaped structure; and a stator core 20 is fixedly installed on the reinforcing ribs 5.

[0019] Further, the rectangular cavity 6 in the middle of the stator shaft 10 and the side cavity 7 formed by the stator shaft 10 and the stator core 20 are cooling channels; the total area of the rectangular cavity 6 and the side cavity 7 is greater than the total area of the reinforcing rib 5 and the stator shaft 10 and the stator core 20; the contact area ratio of the side cavity 7 and the stator core 20 is greater than 70%; the cooling mode of the cooling channel is preferably forced air cooling, but is not limited to air cooling, and can be oil cooling, water cooling, etc.; considering various cooling modes, various cooling pipes can be laid in the cooling channel.

[0020] Further, the thickness of the upper cover plate 1 is greater than the thickness of the lower cover plate 3.

[0021] Further, the number of the reinforcing ribs 5 is 2-8.

[0022] The working principle of the embodiment is as follows: the stator shaft 10 of the application is composed of an upper cover plate, a lower cover plate, two webs and a plurality of reinforcing ribs, the stator core 20 is assembled on the reinforcing ribs, and the stator shaft 10 is a box-shaped shaft with variable cross-section, the large cross-section is the stator assembly position, and the small cross-section is the bearing assembly position, considering that the stator shaft 10 bears torque and more downward vertical load, the cooling channel is arranged in the cavity formed by the stator core and the box-shaped shaft; and the appropriate cooling channel can be arranged by air cooling and liquid cooling.

[0023] The structure can ensure that the shaft bending deformation is not greater than 0.2 mm, the maximum torsional deformation is not greater than 2 mm, and the thermal equilibrium temperature is not higher than 160℃ when the mechanism S1-100% works.

[0024] The application reduces the bending deformation and torsional deformation of the stator shaft by the box-shaped shaft with variable cross-section, the design of the large-area cooling channel on the stator shaft not only reduces the weight of the mechanism and improves the heat dissipation efficiency, but also achieves the purpose of reducing the overall cost.

[0025] It is apparent for those skilled in the art that the application is not limited to the details of the above exemplary embodiments, and the application can be implemented in other specific forms without departing from the spirit or essential characteristics of the application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the application.

[0026] Furthermore, it should be understood that although the specification is described in terms of embodiments, the specification is not to be limited to only these described embodiments. The specification is intended to include each individual embodiment as a separate embodiment as well as any combination of individual embodiments.

Claims

1. A stator shaft with good torque transmission and heat dissipation performance, characterized by: The stator shaft (10) is a variable cross-section box beam structure, large cross-section transmits torque, small cross-section bears load, the stator shaft (10) includes upper cover plate (1), right web plate (2), lower cover plate (3) and left web plate (4), the upper cover plate (1), right web plate (2), lower cover plate (3) and left web plate (4) are combined into a back type structure, a plurality of reinforcing ribs (5) are symmetrically arranged on the outside of the back type structure, the stator core (20) is fixedly installed on the reinforcing rib (5); The rectangular cavity (6) in the middle of the stator shaft (10) and the side cavity (7) formed by the stator shaft (10) and the stator core (20) are cooling channels. The contact area ratio of the side cavity (7) and the stator core (20) is greater than 70%.

2. The stator shaft of claim 1, wherein: The total area of the rectangular cavity (6) and the side cavity (7) is greater than the total area of the reinforcing rib (5) and the stator shaft (10) and the stator core (20) in contact.

3. The stator shaft of claim 1, wherein: The cooling mode of the cooling channel is one of air cooling, oil cooling and water cooling.

4. The stator shaft of claim 1, wherein: The thickness of the upper cover plate (1) is greater than the thickness of the lower cover plate (3).

5. The stator shaft of claim 1, wherein: The number of the reinforcing rib (5) is 2-8.

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