PCB motor

Abstract

The utility model belongs to the technical field of motors, and discloses a PCB motor. The PCB motor comprises a shell, a motor shaft, stators and rotors, the motor shaft is rotationally arranged in the shell, the two rotors are arranged on the motor shaft in parallel at intervals, the stators are arranged in the shell and located between the two rotors, first fins are arranged on the portion, located between the two rotors, of the motor shaft, and the multiple first fins are arranged at intervals in the circumferential direction of the motor shaft; second fins are arranged on the peripheries of the rotors, and a plurality of second fins are arranged on the peripheries of the two rotors at intervals. The motor shaft and the two rotors of the PCB motor are provided with the first fins and the second fins respectively, the first fins and the second fins can increase turbulent flow in the shell, turbulent flow is formed in the shell, the heat exchange efficiency of the stator and the shell is improved, the contact area of the stator and air in the shell is increased through the second fins, the heat exchange efficiency is further improved, and the service life of the motor is prolonged. And the highest temperature of the PCB motor is reduced, so that the use performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a PCB motor. Background Art

[0002] A PCB motor is a brushless DC motor that uses current from an electronic controller to generate rotational force within the motor. A PCB motor primarily consists of a stator, a rotor, and other components. The stator is composed of a PCB, coils, and magnets, while the rotor consists of a PCB with permanent magnets attached to it.

[0003] Compared with other types of motors, since the windings of PCB motors are positioned on the PCB, they can be easily mass-produced through the highly mature PCB manufacturing industry. The winding coils of the PCB structure further shorten the axial size of the motor, making the structure more compact, while further reducing the weight of the motor, improving efficiency, and greatly improving power density.

[0004] However, in order to compress the axial size, PCB disc motors use glass fiber materials with poor thermal conductivity, resulting in a more significant temperature rise in the motor. Thermal performance is an important indicator for measuring motor performance. A higher motor temperature rise not only affects the service life, but also damages the insulation material, affecting the safe and reliable operation of the motor.

[0005] Therefore, a PCB motor is needed to solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide a PCB motor, which has a lower operating temperature and thus ensures better safety and reliability.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] A PCB motor includes a housing, a motor shaft, a stator and a rotor. The motor shaft is rotatably arranged in the housing. The two rotors are arranged parallel to and spaced apart from the motor shaft. The stator is arranged inside the housing and located between the two rotors. A portion of the motor shaft located between the two rotors is provided with a plurality of first fins, which are spaced apart circumferentially around the motor shaft. Second fins are provided on the outer circumference of the rotor, and a plurality of second fins are spaced apart on the outer circumference of both rotors.

[0009] As an optional technical solution, the motor shaft includes a main body, a first connecting part and a second connecting part, the first connecting part and the second connecting part are parallel to and spaced apart from each other on the main body, the first connecting part is used to connect one of the rotors, and the second connecting part is used to connect the other rotor, and the two ends of the first fin along the thickness direction are respectively connected to the first connecting part and the second connecting part, and the thickness direction is parallel to the axial direction of the motor shaft.

[0010] As an optional technical solution, the first connecting portion and the second connecting portion form an accommodating cavity, the first fin is located in the accommodating cavity, and the first fin does not protrude from the first connecting portion and the second connecting portion along the radial direction of the motor shaft.

[0011] As an optional technical solution, the stator and the first fin are arranged at intervals along the radial direction of the motor shaft.

[0012] As an optional technical solution, the dimension of the second fin along the thickness direction is the same as the dimension of the rotor along the thickness direction.

[0013] As an optional technical solution, the size of the first fin along the circumferential direction of the motor shaft is a, and a gradually decreases or remains unchanged along the radial outward extension direction of the motor shaft; and / or, the size of the second fin along the circumferential direction of the rotor is b, and b gradually decreases or remains unchanged along the radial outward extension direction of the rotor.

[0014] As an optional technical solution, the first fin and / or the second fin has a triangular structure.

[0015] As an optional technical solution, the vertex angle of the triangular structure away from the motor shaft is less than 60 degrees.

[0016] As an optional technical solution, the first fin and / or the second fin are symmetrically arranged with respect to a preset plane, and the central axis of the motor shaft is located in the preset plane.

[0017] As an optional technical solution, heat dissipation strips are provided on the outer surface of the shell.

[0018] Beneficial effects of the utility model:

[0019] The utility model discloses a PCB motor, which includes a housing, a motor shaft, a stator, and a rotor. The motor shaft is rotatably arranged in the housing, two rotors are arranged parallel to and spaced apart from the motor shaft, the stator is arranged inside the housing, and the stator is located between the two rotors. The portion of the motor shaft located between the two rotors is provided with a first fin, a plurality of first fins are spaced apart around the circumference of the motor shaft, a second fin is provided on the outer circumference of the rotor, and a plurality of second fins are spaced apart on the outer circumference of each of the two rotors. The motor shaft and the two rotors of this PCB motor are respectively provided with the first fin and the second fin. During the rotation of the motor shaft, the first fin on the motor shaft and the second fin on the rotor can increase the turbulence inside the housing, so that turbulence is formed inside the PCB motor housing, thereby enabling better heat exchange between the stator and the housing. At the same time, the added second fin increases the contact area between the stator and the air inside the housing, further improving the heat exchange efficiency, which is conducive to reducing the maximum temperature of the PCB motor, thereby improving the performance of the PCB motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a PCB motor according to an embodiment of the present invention;

[0021] Figure 2 This is a front view of a PCB motor according to an embodiment of the present invention;

[0022] Figure 3 yes Figure 2 Cross-sectional view of AA;

[0023] Figure 4 This is a schematic structural diagram of the motor shaft, stator and rotor of one embodiment of the present utility model;

[0024] Figure 5 yes Figure 4 A partial enlarged view of middle B;

[0025] Figure 6 This is a schematic structural diagram of a motor shaft in one embodiment of the present utility model;

[0026] Figure 7 This is a front view of a motor shaft according to one embodiment of the present invention;

[0027] Figure 8 yes Figure 7 Cross-sectional view of CC;

[0028] Figure 9 It is a structural schematic diagram of a motor shaft, a stator and a rotor according to another embodiment of the present invention;

[0029] Figure 10 yes Figure 9 A partial enlarged view of middle E;

[0030] Figure 11 This is a schematic structural diagram of a motor shaft in one embodiment of the present utility model;

[0031] Figure 12 This is a front view of a motor shaft according to one embodiment of the present invention;

[0032] Figure 13 yes Figure 12 Cross-sectional view of the middle DD;

[0033] Figure 14 This is a temperature cloud diagram of the PCB stator winding when the first fin and the second fin are not added to the practical motor shaft and the new rotor;

[0034] Figure 15 It is a velocity vector diagram of the flow field inside the PCB motor when the first fin and the second fin are not added to the practical motor shaft and the new rotor;

[0035] Figure 16 This is a temperature cloud diagram of the PCB stator winding when the first fin of the motor shaft and the second fin of the rotor are both triangular structures;

[0036] Figure 17 It is a velocity vector diagram of the flow field inside the PCB motor when the first fin of the motor shaft and the second fin of the rotor are both triangular structures;

[0037] Figure 18 This is a temperature cloud diagram of the PCB stator winding when the first fin of the motor shaft and the second fin of the rotor are both rectangular structures;

[0038] Figure 19 This is a velocity vector diagram of the flow field inside the PCB motor when the first fin of the motor shaft and the second fin of the rotor are both rectangular structures.

[0039] In the picture:

[0040] 10. Housing; 11. Heat dissipation strip;

[0041] 20. Motor shaft; 21. First fin; 22. First connecting portion; 23. Second connecting portion;

[0042] 30. stator;

[0043] 40. Rotor; 41. Second fin. DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0045] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0046] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0047] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0048] like Figures 1 to 5As shown, a PCB motor is provided in this embodiment, which includes a housing 10, a motor shaft 20, a stator 30 and a rotor 40. The motor shaft 20 is rotatably arranged in the housing 10, and the two rotors 40 are arranged parallel to and spaced apart from the motor shaft 20. The stator 30 is arranged inside the housing 10, and the stator 30 is located between the two rotors 40. The portion of the motor shaft 20 located between the two rotors 40 is provided with a plurality of first fins 21, and the plurality of first fins 21 are arranged at intervals around the circumference of the motor shaft 20. The outer periphery is provided with second fins 41, and the outer peripheries of the two rotors 40 are both spaced apart with a plurality of second fins 41. Specifically, in this embodiment, the motor shaft 20 is rotatably arranged in the housing 10, and the rotation of the motor shaft 20 drives the rotor 40 to rotate. The part of the motor shaft 20 located between the two rotors 40 is provided with a plurality of first fins 21 arranged at intervals along the circumference of the motor shaft 20, and a plurality of second fins 41 are arranged at intervals on the outer periphery of the rotor 40. During the rotation of the motor shaft 20, the first fins 21 and the second fins 41 can rotate synchronously with the motor shaft 20, thereby causing disturbances to the air inside the housing 10, causing the gas inside the housing 10 to form turbulence, thereby improving the heat exchange efficiency of the housing 10, and the second fins 41 on the rotor 40 can increase the contact area between the stator 30 and the air in the housing 10, further improving the exchange efficiency of the air between the stator 30 and the housing 10, thereby making the PCB motor have better thermodynamic properties and improving the performance of the PCB motor.

[0049] Furthermore, if Figure 6 and Figure 8 As shown, the motor shaft 20 includes a body, a first connecting portion 22, and a second connecting portion 23. The first connecting portion 22 and the second connecting portion 23 are coaxially spaced apart from each other on the body. The first connecting portion 22 is used to connect to one of the rotors 40, and the second connecting portion 23 is used to connect to the other rotor 40. The first fin 21 is connected to the first connecting portion 22 and the second connecting portion 23 at both ends along the thickness direction. The thickness direction is parallel to the axial direction of the motor shaft 20. Specifically, in this embodiment, the first connecting portion 22 and the second connecting portion 23 are integrally formed with the motor shaft 20. The first connecting portion 22 connects to one of the rotors 40, and the second connecting portion 23 connects to the other rotor 40, so that the rotors 40 can rotate synchronously with the motor shaft 20. The first fin 21 is connected to the first connecting portion 22 and the second connecting portion 23 at both ends along the width direction. This ensures that the first fin 21 has good mechanical properties, ensures the stability of the first fin 21 during the rotation of the motor shaft 20, and helps to ensure the spacing between two adjacent first fins 21, thereby ensuring the heat dissipation effect of the PCB motor.

[0050] Furthermore, the first connecting portion 22 and the second connecting portion 23 form a receiving cavity, and the first fin 21 is received in the receiving cavity, and the first fin 21 does not protrude beyond the first connecting portion 22 and the second connecting portion 23 in the radial direction of the motor shaft 20. Specifically, in this embodiment, the first fin 21 does not protrude beyond the first connecting portion 22 and the second connecting portion 23 in the radial direction of the motor shaft 20. This allows the first fin 21 to disturb the air in the receiving cavity during rotation, thereby driving the flow of gas outside the receiving cavity. This ensures the disturbing effect of the first fin 21 and also avoids interference with other components inside the housing 10, thereby improving safety during use.

[0051] Furthermore, the stator 30 and the first fins 21 are spaced apart in the radial direction of the motor shaft 20. Specifically, in this embodiment, the outer ring of the stator 30 is fixed to the inner wall of the housing 10, the inner ring of the stator 30 is located in the accommodating cavity, and the inner ring of the stator 30 and the first fins 21 are spaced apart in the radial direction of the motor shaft 20. As the first fins 21 rotate with the motor shaft 20, they disturb the air in the accommodating cavity, improving the heat exchange efficiency between the air and the stator 30, thereby reducing the overall temperature of the PCB motor.

[0052] Furthermore, the thickness dimension of the second fin 41 is the same as the thickness dimension of the rotor 40. Specifically, in this embodiment, this arrangement not only facilitates the production of the rotor 40, but also increases the contact area between the second fin 41 and the air, thereby enhancing the air disturbance effect of the second fin 41 and thus improving heat exchange efficiency.

[0053] In this embodiment, since the heat exchange performance between the shell 10 and the gas is good when the gas inside the shell 10 is in turbulence, the Reynolds number of the gas reflects the state of the gas. The calculation formula of the Reynolds number Re is:

[0054] Re=ρVD h / μ

[0055] Where ρ is the air density, V is the air velocity, and D h is the fin pitch, and μ is the air dynamic viscosity. Increasing the number of first fins 21 can increase the contact area between the motor shaft 20 and the air. Similarly, increasing the number of second fins 41 can also increase the contact area between the rotor 40 and the air, thereby improving the heat exchange efficiency. However, as the number of first fins 21 and second fins 41 increases, the spacing between the first fins 21 and the second fins 41 decreases, which in turn causes the Reynolds number to decrease. When the Reynolds number is less than the critical value, the gas in the housing 10 will change from turbulent flow to laminar flow, which is not conducive to heat exchange. Therefore, the pitch between two adjacent first fins 21 and the pitch between two adjacent second fins 41 can both be calculated to a minimum value through the formula, so that the number of first fins 21 and second fins 41 both has a maximum value.

[0056] Furthermore, the dimension of the first fin 21 along the circumferential direction of the motor shaft 20 is a, and a gradually decreases or remains unchanged along the radial outward extension direction of the motor shaft 20; and / or, the dimension of the second fin 41 along the circumferential direction of the rotor 40 is b, and b gradually decreases or remains unchanged along the radial outward extension direction of the rotor 40. Specifically, in this embodiment, the dimension of the root of the first fin 21 along the circumferential direction of the motor shaft 20 is a, and a gradually decreases along the radial outward extension direction of the motor shaft 20; and the dimension of the second fin 41 along the circumferential direction of the rotor 40 is b, and b gradually decreases along the radial outward extension direction of the rotor 40. This arrangement enables the first fin 21 and the second fin 41 to gradually become thinner along the radial outward extension direction of the rotor 40 under the premise that the number of the first fin 21 and the second fin 41 is a fixed value, so that the contact area between the first fin 21 and the second fin 41 and the air is larger, and the first fin 21 and the second fin 41 can push the air toward the housing 10 when in contact with the air, thereby improving the exchange efficiency between the air and the housing 10, and further reducing the temperature of the PCB motor.

[0057] like Figures 9 to 13 As shown, in another embodiment, the dimension of the first fin 21 along the circumferential direction of the motor shaft 20 is a, and a remains unchanged along the radial outward extension direction of the motor shaft 20; and the dimension of the second fin 41 along the circumferential direction of the rotor 40 is b, and b remains unchanged along the radial outward extension direction of the rotor 40, so that the first fin 21 and the second fin 41 have a rectangular structure as a whole, which can also serve the purpose of disturbing the air and increasing the contact area between the stator 30 and the air, which will not be elaborated here.

[0058] Furthermore, the first fin 21 and / or the second fin 41 have a triangular structure. Specifically, in this embodiment, the first fin 21 and the second fin 41 both have a triangular structure, a gradually decreases to 0 along the direction extending outward from the motor shaft 20, and b gradually decreases to 0 along the direction extending outward from the rotor 40. This arrangement maximizes the contact area between the first fin 21 and the second fin 41 and the air when the bottom width is fixed and the height is limited, thereby ensuring the heat exchange performance between the first fin 21 and the second fin 41 and the air.

[0059] Furthermore, the apex angle of the triangular structure away from the motor shaft 20 is less than 60 degrees. Specifically, in this embodiment, the apex angle of the triangular structure away from the motor shaft 20 is less than 60 degrees, which ensures that the width of the root of the first fin 21 is less than the length of the side, thereby increasing the contact area between the first fin 21 and the air. The first fin 21 is thinner overall, which facilitates heat exchange between the first fin 21 and the air in the housing 10, thereby improving heat exchange performance. The second fin 41 is similarly configured and will not be described in detail here.

[0060] In this embodiment, the first fin 21 is integrally formed with the motor shaft 20, and the second fin 41 is integrally formed with the rotor 40. This arrangement can enhance the integrity of the first fin 21 and the motor shaft 20, and the second fin 41 and the rotor 40, ensuring the connection performance of the first fin 21 and the second fin 41 during operation, and can facilitate processing and improve production efficiency.

[0061] Furthermore, the first fins 21 and / or the second fins 41 are symmetrically arranged about a predetermined plane, and the central axis of the motor shaft 20 lies within the predetermined plane. Specifically, in this embodiment, the first fins 21 and the second fins 41 are both symmetrical about the predetermined plane. This arrangement avoids the need to identify the front and back sides of the motor shaft 20 or rotor 40 during installation, thereby ensuring efficient PCB motor installation.

[0062] For further information, please refer to Figure 1 and Figure 2 , heat dissipation bars 11 are provided on the outer surface of the housing 10. Specifically, in this embodiment, the heat dissipation bars 11 are provided on the outer surface of the housing 10. The heat dissipation bars 11 can increase the surface area of ​​the housing 10 in contact with the air, thereby improving the heat exchange efficiency between the outer air of the housing 10 and the outer air, thereby reducing the temperature of the housing 10, and facilitating the heat exchange efficiency between the inner surface of the housing 10 and the air inside the housing 10, thereby ensuring that the PCB motor has a lower operating temperature during use.

[0063] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. PCB motor, characterized in that, The PCB motor comprises a housing (10), a motor shaft (20), a stator (30) and a rotor (40), wherein the motor shaft (20) is rotatably arranged on the housing (10), the two rotors (40) are arranged in parallel and at intervals on the motor shaft (20), the stator (30) is arranged inside the housing (10), and the stator (30) is located between the two rotors (40), a portion of the motor shaft (20) located between the two rotors (40) is provided with a plurality of first fins (21), the plurality of first fins (21) are arranged at intervals around the circumference of the motor shaft (20), the outer periphery of the rotor (40) is provided with second fins (41), and the outer peripheries of the two rotors (40) are both provided with a plurality of second fins (41) at intervals.

2. The PCB motor according to claim 1, characterized in that: The motor shaft (20) comprises a body, a first connecting portion (22) and a second connecting portion (23), wherein the first connecting portion (22) and the second connecting portion (23) are arranged in parallel and at intervals on the body, the first connecting portion (22) is used to connect one of the rotors (40), and the second connecting portion (23) is used to connect the other rotor (40), and the first fin (21) is connected to the first connecting portion (22) and the second connecting portion (23) at both ends along the thickness direction, respectively, and the thickness direction is parallel to the axial direction of the motor shaft (20).

3. The PCB motor according to claim 2, characterized in that: The first connecting portion (22) and the second connecting portion (23) form an accommodating cavity, the first fin (21) is located in the accommodating cavity, and the first fin (21) does not protrude from the first connecting portion (22) and the second connecting portion (23) along the radial direction of the motor shaft (20).

4. The PCB motor according to claim 1, characterized in that: The stator (30) and the first fin (21) are arranged at intervals along the radial direction of the motor shaft (20).

5. The PCB motor according to claim 1, characterized in that: The dimension of the second fin (41) in the thickness direction is the same as the dimension of the rotor (40) in the thickness direction.

6. The PCB motor according to claim 1, characterized in that: The size of the first fin (21) along the circumferential direction of the motor shaft (20) is a, and a gradually decreases or remains unchanged along the radial outward extension direction of the motor shaft (20); and / or the size of the second fin (41) along the circumferential direction of the rotor (40) is b, and b gradually decreases or remains unchanged along the radial outward extension direction of the rotor (40).

7. The PCB motor according to claim 6, characterized in that: The first fin (21) and / or the second fin (41) are in a triangular structure.

8. The PCB motor according to claim 7, characterized in that: The vertex angle of the triangular structure away from the motor shaft (20) is less than 60°.

9. The PCB motor according to claim 6, characterized in that: The first fin (21) and / or the second fin (41) are symmetrically arranged with respect to a preset plane, and the central axis of the motor shaft (20) is located in the preset plane.

10. The PCB motor according to any one of claims 1 to 9, characterized in that: A heat dissipation strip (11) is provided on the outer surface of the housing (10).

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