Casing and bearingless sheet motor
By arranging auxiliary grooves in the casing body of the bearingless lamellar motor to increase the resistance of the eddy current flow path, the problem of temperature increase and efficiency decrease caused by eddy current loss under high load conditions is solved, and the effect of cooling down and improving efficiency is achieved.
Patent Information
- Application Number
- CN202421093574.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-17
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-05-17
AI Technical Summary
The existing bearing-free sheet motors have increased temperature and reduced efficiency due to eddy current losses under high load conditions.
A casing is designed, the casing body is divided into a first area and a second area along the axis direction, and an auxiliary groove is provided in the first area. These auxiliary grooves are arranged along the axis of the casing body, which increases the length of the flow path of the induced eddy current and increases the resistance of the flow path, thereby reducing the eddy current loss.
By increasing the resistance of the eddy current flow path, the eddy current loss is reduced, the temperature rise of the bearingless lamella motor is reduced, and its efficiency is improved.
Smart Images
Figure CN222381432U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motors, in particular to a casing and a bearingless thin-film motor. Background Art
[0002] The casing of the existing bearingless thin-film motor is generally a cylindrical metal casing, the casing is equipped with a lower end cover, the upper part of the casing has no end cover, and the casing is equipped with heat dissipation fins around the casing.
[0003] However, during the operation of the bearingless thin-film motor, especially under high-load conditions, large eddy current losses will be generated in the housing, causing the temperature of the bearingless thin-film motor to increase and the efficiency to decrease. Utility Model Content
[0004] In order to solve the problems existing in the prior art, one of the purposes of the utility model is to provide a casing.
[0005] The utility model provides the following technical solutions:
[0006] A casing comprises a casing body and an end cover;
[0007] The housing body has a first area and a second area along the axial direction, and an auxiliary groove is provided in the first area;
[0008] The end cap is connected to an end of the second region away from the first region.
[0009] As a further optional solution for the casing, the auxiliary groove is arranged along the axial direction of the casing body.
[0010] As a further optional solution for the casing, the number of the auxiliary grooves is 10-30, and the plurality of auxiliary grooves are distributed along the circumference of the casing body.
[0011] As a further optional solution for the casing, the length of the auxiliary groove along the axial direction of the casing body is 30-50 mm.
[0012] As a further optional solution for the casing, the width of the auxiliary groove along the circumference of the casing body is 3.5-4.5 mm.
[0013] As a further optional solution for the housing, one end of the auxiliary groove along the axial direction of the housing body is exposed at an end of the first area away from the second area.
[0014] As a further optional solution for the housing, the auxiliary groove has a first end away from the second area, and a connecting rib is formed between a wall of the first end and an end of the first area away from the second area.
[0015] As a further optional solution for the casing, the auxiliary groove is arranged along the circumference of the casing body.
[0016] As a further optional solution for the casing, the casing further includes a heat sink, and the heat sink is arranged on the outer wall of the casing body and is located in the second area.
[0017] Another object of the utility model is to provide a bearingless thin-film motor.
[0018] The utility model provides the following technical solutions:
[0019] A bearingless thin-film motor comprises the above-mentioned casing.
[0020] The embodiments of the present invention have the following beneficial effects:
[0021] During the operation of the bearingless thin-film motor, induced eddy currents will be generated in the casing body of the above-mentioned casing, and the induced eddy currents are concentrated in the first area of the casing body and the side of the second area close to the first area. After the auxiliary slot is set in the first area, an open circuit is formed at the auxiliary slot, and the induced eddy current cannot be conducted, but can only bypass the position where the auxiliary slot is located, thereby increasing the length of the flow path of the induced eddy current, and then increasing the resistance of the flow path of the induced eddy current. In addition, at both ends of the auxiliary slot, the flow channel of the induced eddy current becomes narrow, which can also increase the resistance of the flow path of the induced eddy current. When the potential difference remains unchanged, the greater the resistance of the flow path of the induced eddy current, the lower the power, thereby achieving the effect of reducing eddy current loss, reducing the temperature rise of the bearingless thin-film motor, and improving the efficiency of the bearingless thin-film motor.
[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0024] Figure 1 A schematic structural diagram of a housing of a bearingless thin-film motor is shown;
[0025] Figure 2 A schematic diagram of the distribution of induced eddy currents in a housing of a bearingless thin-film motor is shown;
[0026] Figure 3 An induced eddy current vector diagram of a housing of a bearingless thin-film motor is shown;
[0027] Figure 4 The figure shows the equivalent schematic diagram of induced eddy current of a bearingless thin-film motor after the housing is unfolded;
[0028] Figure 5 A schematic diagram of the overall structure of a housing provided by an embodiment of the utility model is shown;
[0029] Figure 6 The schematic diagram of the equivalent induction eddy current after the housing is unfolded provided by an embodiment of the utility model is shown;
[0030] Figure 7 A schematic diagram showing the relationship between the number of auxiliary slots and eddy current loss in a housing provided by an embodiment of the utility model is shown;
[0031] Figure 8 A schematic diagram showing the relationship between the length of an auxiliary slot in a housing and eddy current loss provided by an embodiment of the utility model is shown;
[0032] Fig. 9 A schematic diagram showing the relationship between the width of an auxiliary slot in a housing and eddy current loss provided by an embodiment of the utility model is shown;
[0033] Fig.10 A schematic diagram of the overall structure of a casing provided by another embodiment of the utility model is shown.
[0034] Description of main component symbols:
[0035] 10-housing; 20-lower end cover; 30-heat dissipation fins; 100-housing body; 110-first region; 111-auxiliary groove; 111a-first end; 111b-second end; 112-connecting ribs; 120-second region; 200-end cover; 300-heat dissipation element. DETAILED DESCRIPTION
[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.
[0037] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.
[0038] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of the template herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.
[0041] See also Figure 1 The housing of a bearingless thin-film motor is generally a cylindrical metal housing 10, and the axis of the housing 10 is vertical. The housing 10 is equipped with a lower end cover 20, the upper part of the housing 10 has no end cover, and the housing 10 is equipped with heat dissipation fins 30 around it.
[0042] During the operation of the bearingless thin-film motor, especially under high load conditions, large eddy current losses will be generated in the housing 10. The eddy current loss distribution of the simplified housing model without the heat dissipation fins 30 is shown in FIG. Figure 2 , Figure 3 As shown in the figure, it can be seen that the vortex center of the induced eddy current on the shell 10 is located at a position slightly above the center of the shell 10 along the axial direction, that is, the area of the shell 10 away from the lower end cover 20.
[0043] The shell 10 is expanded along the circumferential direction, and the equivalent schematic diagram of the induced eddy current on the shell 10 is as follows: Figure 4 As shown, the dotted line in the figure is the induced eddy current on the housing 10.
[0044] Example
[0045] See also Figure 5 This embodiment provides a casing, specifically a casing of a bearingless thin-film motor, which includes a casing body 100 and an end cover 200.
[0046] The housing body 100 is cylindrical and has a first area 110 and a second area 120 along the axial direction. An auxiliary groove 111 is provided in the first area 110. The auxiliary groove 111 is a through groove that penetrates the housing body 100 along the wall thickness direction of the housing body 100.
[0047] In addition, the end cover 200 is connected to an end of the second region 120 away from the first region 110 .
[0048] During the operation of the bearingless thin-film motor, induced eddy currents are generated in the casing body 100 of the casing, and the induced eddy currents are concentrated in the first area 110 of the casing body 100 and a side of the second area 120 close to the first area 110 .
[0049] Please combine Figure 6 After the auxiliary groove 111 is provided in the first region 110, an open circuit is formed at the auxiliary groove 111, and the induced eddy current cannot be conducted, but can only bypass the position where the auxiliary groove 111 is located, thereby increasing the length of the flow path of the induced eddy current, and then increasing the resistance of the flow path of the induced eddy current. In addition, at both ends of the auxiliary groove 111, the flow channel of the induced eddy current becomes narrow, which can also increase the resistance of the flow path of the induced eddy current.
[0050] When the potential difference remains unchanged, the greater the resistance of the flow path of the induced eddy current, the lower the power, thereby achieving the effect of reducing eddy current loss, reducing the temperature rise of the bearingless thin-film motor, and improving the efficiency of the bearingless thin-film motor.
[0051] Optionally, the casing body 100 is cylindrical.
[0052] Furthermore, the housing further comprises a heat sink 300 . The heat sink 300 is disposed on the outer wall of the housing body 100 and is located in the second area 120 .
[0053] When in use, the heat sink 300 increases the heat exchange area between the housing body 100 and the external environment, which can accelerate heat dissipation and help reduce the temperature of the bearingless thin film motor.
[0054] In this embodiment, the heat sink 300 is a fin-type structure and is disposed along the axis direction of the housing body 100. There are multiple heat sinks 300, and the multiple heat sinks 300 are distributed along the circumference of the housing body 100.
[0055] In some embodiments, the auxiliary groove 111 is arranged along the axis of the housing body 100. At this time, the induced eddy current originally flowing through the auxiliary groove 111 along the circumference of the housing body 100 needs to be turned back along the axis of the housing body 100 to bypass the position where the auxiliary groove 111 is located.
[0056] In other embodiments, the auxiliary groove 111 may also be arranged along the circumference of the housing body 100. In this case, the induced eddy current originally flowing through the auxiliary groove 111 along the axial direction of the housing body 100 needs to be turned back along the circumference of the housing body 100 to bypass the position where the auxiliary groove 111 is located.
[0057] In some other embodiments, the auxiliary groove 111 may also extend in a spiral shape around the axis of the housing body 100 .
[0058] The following description will be made by taking the auxiliary groove 111 being arranged along the axial direction of the casing body 100 as an example.
[0059] It can be understood that the more the number of auxiliary slots 111 is, the more times the induced eddy current returns along the axis direction of the housing body 100, and the longer the flow path of the induced eddy current is. Since the resistance value of the conductor is proportional to the length of the conductor, the longer the flow path of the induced eddy current is, the greater the resistance of the flow path of the induced eddy current is. When the potential difference remains unchanged, the greater the resistance of the flow path of the induced eddy current is, the lower the power is, that is, the lower the eddy current loss is.
[0060] In other words, as the number of the auxiliary slots 111 increases, the eddy current loss gradually decreases. However, the more the number of the auxiliary slots 111 increases, the higher the processing cost of the housing body 100 increases.
[0061] See also Figure 7 Assuming that the length of the auxiliary groove 111 along the axis direction of the housing body 100 is 40 mm, and the width of the auxiliary groove 111 along the circumferential direction of the housing body 100 is 4 mm, as the number of auxiliary grooves 111 increases, the downward trend of eddy current loss gradually tends to be gentle. Considering the processing cost and the effect of reducing eddy current loss, the number of auxiliary grooves 111 is 10-30, and the plurality of auxiliary grooves 111 are distributed along the circumferential direction of the housing body 100.
[0062] Optionally, the number of the auxiliary slots 111 may be 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30 or any value between 10 and 30.
[0063] In this embodiment, the number of the auxiliary slots 111 is 20 because the benefit of reducing eddy current loss hardly increases when the number of the auxiliary slots 111 exceeds 20. Therefore, the number of the auxiliary slots 111 is 20.
[0064] In addition, the longer the length of the auxiliary groove 111 along the axial direction of the housing body 100 is, the farther the distance of the induced eddy current to return along the axial direction of the housing body 100 is, and the longer the flow path of the induced eddy current is. Similarly, since the resistance value of the conductor is proportional to the length of the conductor, the longer the flow path of the induced eddy current is, the greater the resistance of the flow path of the induced eddy current is. When the potential difference remains unchanged, the greater the resistance of the flow path of the induced eddy current is, the lower the power is, that is, the lower the eddy current loss is.
[0065] In other words, as the length of the auxiliary groove 111 along the axial direction of the housing body 100 increases, the eddy current loss gradually decreases. However, the longer the length of the auxiliary groove 111 along the axial direction of the housing body 100 is, the greater the proportion of the first area 110 to the housing body 100 is, the smaller the proportion of the second area 120 to the housing body 100 is, and the smaller the heat exchange area of the heat sink 300 disposed in the second area 120 is, resulting in a poor heat dissipation effect of the housing.
[0066] See also Figure 8 Assuming that the number of the auxiliary grooves 111 is 20 and the width of the auxiliary grooves 111 along the circumference of the housing body 100 is 4 mm, as the length of the auxiliary grooves 111 along the axial direction of the housing body 100 increases, the eddy current loss gradually decreases. Considering the influence of the heat sink 300, the length of the auxiliary grooves 111 along the axial direction of the housing body 100 is D, and 30 mm ≤ D ≤ 50 mm.
[0067] Optionally, the length of the auxiliary groove 111 along the axial direction of the casing body 100 can be 30 mm, 32 mm, 34 mm, 36 mm, 38 mm, 40 mm, 42 mm, 44 mm, 46 mm, 48 mm, 50 mm or any value between 30 mm and 50 mm.
[0068] In this embodiment, the length of the auxiliary groove 111 along the axial direction of the housing body 100 is 40 mm.
[0069] See also Fig. 9 Assuming that the number of auxiliary grooves 111 is 20, and the length of the auxiliary groove 111 along the axial direction of the housing body 100 is 40 mm, as the width of the auxiliary groove 111 along the circumference of the housing body 100 increases, the eddy current loss slowly decreases, that is, the width of the auxiliary groove 111 along the circumference of the housing body 100 has a relatively small effect on the eddy current loss. In combination with the difficulty and economy of the processing technology, the width of the auxiliary groove 111 along the circumference of the housing body 100 is W, and 3.5 mm ≤ W ≤ 4.5 mm.
[0070] Optionally, the width of the auxiliary groove 111 along the circumference of the housing body 100 can be 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, 4.5 mm or any value between 3.5 mm and 4.5 mm.
[0071] In this embodiment, the width of the auxiliary groove 111 along the circumference of the housing body 100 is 4 mm.
[0072] In some embodiments, one end of the auxiliary groove 111 along the axial direction of the casing body 100 is exposed at an end of the first area 110 away from the second area 120 .
[0073] When machining the auxiliary groove 111 , cutting may be performed along the axis of the housing body 100 from one end of the first region 110 away from the second region 120 to the other end. The cutting depth is the length of the auxiliary groove 111 along the axis of the housing body 100 .
[0074] See also Fig.10 In other embodiments, the auxiliary groove 111 has a first end 111a away from the second area 120 and a second end 111b close to the second area 120, and a connecting rib 112 is formed between the wall of the first end 111a and an end of the first area 110 away from the second area 120.
[0075] When processing the auxiliary groove 111 , cutting can be performed along the radial direction of the housing body 100 . The connection ribs 112 formed after cutting can reduce the influence of the groove on the strength of the housing body 100 .
[0076] In summary, during the operation of the bearingless thin-film motor, induced eddy currents will be generated in the casing body 100 of the above-mentioned casing, and the induced eddy currents are concentrated in the first area 110 of the casing body 100 and the side of the second area 120 close to the first area 110. After the auxiliary slot 111 is set in the first area 110, an open circuit is formed at the auxiliary slot 111, and the induced eddy current cannot be conducted, but can only bypass the position where the auxiliary slot 111 is located, thereby increasing the length of the flow path of the induced eddy current, and then increasing the resistance of the flow path of the induced eddy current. In addition, at both ends of the auxiliary slot 111, the flow channel of the induced eddy current becomes narrow, which can also increase the resistance of the flow path of the induced eddy current. When the potential difference remains unchanged, the greater the resistance of the flow path of the induced eddy current, the lower the power, thereby achieving the effect of reducing eddy current loss, reducing the temperature rise of the bearingless thin-film motor, and improving the efficiency of the bearingless thin-film motor.
[0077] This embodiment also provides a bearingless thin-film motor, including the above-mentioned housing.
[0078] In all examples shown and described herein, any specific values should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.
[0079] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0080] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.
Claims
1. A housing, characterized in that: It includes a casing body and an end cover; The housing body has a first area and a second area along the axial direction, and an auxiliary groove is provided in the first area; The end cap is connected to an end of the second region away from the first region.
2. The housing according to claim 1, characterized in that: The auxiliary groove is arranged along the axial direction of the casing body.
3. The housing according to claim 2, characterized in that: The number of the auxiliary grooves is 10-30, and the plurality of auxiliary grooves are distributed along the circumference of the casing body.
4. The housing according to claim 2, characterized in that: The length of the auxiliary groove along the axial direction of the housing body is 30-50 mm.
5. The housing according to claim 2, characterized in that: The width of the auxiliary groove along the circumference of the housing body is 3.5-4.5 mm.
6. The housing according to any one of claims 2 to 5, characterized in that: One end of the auxiliary groove along the axial direction of the housing body is exposed at an end of the first area away from the second area.
7. The housing according to any one of claims 2 to 5, characterized in that: The auxiliary groove has a first end away from the second area, and a connecting rib is formed between a wall of the first end and an end of the first area away from the second area.
8. The housing according to claim 1, wherein: The auxiliary groove is arranged along the circumference of the casing body.
9. The housing according to claim 1, characterized in that: The housing further comprises a heat sink, which is arranged on the outer wall of the housing body and located in the second area.
10. A bearingless thin-film motor, characterized in that: A housing comprising any one of claims 1-9.