A method for performance and volume optimization of a motor heat pipe

Abstract

The application provides a performance and volume optimization method of a motor heat pipe, comprising the following steps: S1, bending the second contact pipe at the connection between the first contact pipe and the second contact pipe, and obtaining an additional volume required when the heat pipe is installed according to the bending angle, the length of the second contact pipe at the current moment and the radius of the motor; S2, obtaining a performance-volume ratio of the heat pipe according to a preset equivalent thermal conductivity curve and the additional volume; and S3, obtaining a corresponding optimized bending angle according to the performance-volume ratio and the bending angle, and bending the second contact pipe to the optimized bending angle. The application can obtain the optimal optimized angle according to the bending angle, the length of the second contact pipe in the heat pipe and the radius of the motor, so that the heat pipe can find the best balance point between performance and additional volume.

Description

Technical Field

[0001] This invention relates to the technical field of motor heat pipes, and more specifically, to a method for optimizing the performance and size of motor heat pipes. Background Technology

[0002] Drones have high requirements for their power-to-weight ratio and reliability, and usually do not have supporting cooling oil circuits. Therefore, the propulsion motor usually adopts air cooling. However, the heat source in the motor is far from the external heat sink, and the heat resistance is large. The heat inside the motor cannot be quickly and effectively conducted to the heat sink and dissipated into the air in time. To solve this problem, heat pipes are usually used as efficient heat conduction medium to conduct the large amount of heat generated in the motor windings to the heat sink. In order to adapt to the limited space inside the motor or the compact installation requirements, the heat pipes usually need to be bent into different angles before being installed in the motor. However, although mechanically bending the heat pipe can reduce the installation volume of the heat pipe to a certain extent, the different bending angles of the heat pipe will have a certain impact on the performance of the heat pipe, which will greatly reduce the equivalent thermal conductivity of the heat pipe. Summary of the Invention

[0003] The present invention aims to solve the problem of finding the optimal bending angle of a heat pipe.

[0004] To address the aforementioned issues, this invention provides a method for optimizing the performance and volume of a motor heat pipe. At least one heat pipe is pre-laid along the radial direction of the motor on the outer circumference of the motor. The heat pipe includes a first contact pipe and a second contact pipe connected end-to-end. The first contact pipe abuts against the outer wall of the motor, while the second contact pipe is suspended relative to the motor. Both the second contact pipe and the first contact pipe are arranged along the axial direction of the motor.

[0005] The performance and size optimization method includes the following steps:

[0006] Step S1: Bend the second contact tube at the connection between the first contact tube and the second contact tube, and obtain the additional volume required to install the heat pipe based on the bending angle and length of the second contact tube at the current moment and the radius of the motor.

[0007] Step S2: Obtain a performance-volume ratio of the heat pipe based on a preset equivalent thermal conductivity curve and the additional volume;

[0008] Step S3: Obtain an optimized bending angle based on the performance-volume ratio and the bending angle, and bend the second contact tube to the optimized bending angle.

[0009] In this solution, considering that the heat pipe usually needs to be bent into different angles before being installed in the motor, although bending the heat pipe can reduce the additional volume required for installation, it will affect the performance of the heat pipe and thus reduce the equivalent thermal conductivity of the heat pipe. This method can find an optimal bending angle that puts the heat pipe at the optimal balance between performance and additional volume.

[0010] Furthermore, considering that the additional volume of the heat pipe is related to the bending angle and length of the second contact tube and the radius of the motor, and that the equivalent thermal conductivity of the heat pipe is related to the bending angle of the second contact tube, this method only processes the three variables of the bending angle, length, and radius of the motor to obtain the optimized bending angle, thereby minimizing the number of variables, weakening the influence of other variables, and improving the accuracy of the optimized bending angle.

[0011] Preferably, the bending angle is the angle between the second contact tube before bending and the second contact tube after bending.

[0012] Preferably, step S1 includes:

[0013] Step S11: Bend the second contact tube and determine whether the bending angle of the second contact tube at the current moment is within a preset angle range.

[0014] If so, proceed to step S12;

[0015] If not, proceed to step S13;

[0016] Step S12: Based on the bending angle and length of the second contact tube and the radius of the motor, obtain an axial volume and a first radial volume required for installing the heat pipe, and use the sum of the axial volume and the first radial volume as the additional volume;

[0017] Step S13: Based on the bending angle and length of the second contact tube and the radius of the motor, a second radial volume required for installing the heat pipe is obtained, and the second radial volume is used as the additional volume.

[0018] In this scheme, considering that the bending angle of the second contact tube is not greater than 90 degrees, it involves the calculation of axial volume. Therefore, step S11 is first used to determine whether the bending angle is within the angle range. Based on the determination result, different steps are taken to obtain the corresponding additional volume, making the entire process of step S1 more systematic and reasonable.

[0019] Preferably, in step S12, the additional volume is obtained by the following calculation formula:

[0020] V = 2πrl 2 sinα+πl 3 sin 2 α+2πrl 2 sinαcosα+πl 3 sin 2 αcosα+πlr 2 cosα

[0021] in,

[0022] V represents the additional volume;

[0023] r represents the radius of the motor;

[0024] ɑ represents the bending angle of the second contact tube;

[0025] l represents the length of the second contact tube.

[0026] Preferably, in step S13, the additional volume is obtained by the following calculation formula:

[0027] V=πl 3 sin 2 α+2πrl 2 sinα

[0028] in,

[0029] V represents the additional volume;

[0030] r represents the radius of the motor;

[0031] ɑ represents the bending angle of the second contact tube;

[0032] l represents the length of the second contact tube.

[0033] Preferably, in step S2, the relationship expression of the equivalent thermal conductivity curve is as follows:

[0034] λ(α)=268483-944α-0.3854α 2

[0035] in,

[0036] λ(α) represents the equivalent thermal conductivity of the heat pipe;

[0037] ɑ represents the bending angle of the second contact tube.

[0038] Preferably, step S3 includes:

[0039] Step S31: Determine whether the bending angle of the second contact tube is less than a preset angle.

[0040] If so, proceed to step S32;

[0041] If not, proceed to step S33;

[0042] Step S32: Determine whether the radius of the motor is less than a preset threshold.

[0043] If not, then 90 degrees is taken as the optimized bending angle, and the second contact tube is bent to the optimized bending angle, and then the process is exited;

[0044] If so, then 0 degrees is taken as the optimized bending angle, and the second contact tube is bent to the optimized bending angle, and then the process is exited;

[0045] Step S33: Use 180 degrees as the optimized bending angle, and bend the second contact tube to the optimized bending angle.

[0046] In this solution, the bending angle of the second contact tube and the radius of the motor are both determined to find the optimal bending angle that is suitable for different bending angles and the radius of the motor. The optimal bending angle can be found more accurately through the dual determination.

[0047] Preferably, the preset threshold is Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the motor and heat pipe of the present invention;

[0049] Figure 2 This is a flowchart of the steps of the present invention;

[0050] Figure 3 This is a flowchart illustrating step S1 of the present invention.

[0051] Figure 4 This is a flowchart illustrating step S3 of the present invention.

[0052] Explanation of reference numerals in the attached drawings: 1. Motor; 2. First contact tube; 3. Second contact tube; 4. Axial volume; 5. First radial volume; 6. Second radial volume. Detailed Implementation

[0053] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0054] In a preferred embodiment of the present invention, based on the above-mentioned problems existing in the prior art, a method for optimizing the performance and volume of a motor heat pipe is provided, such as... Figure 1 As shown, at least one heat pipe is laid in advance along the radial direction of the motor 1 on the outer circumference of the motor 1. The heat pipe includes a first contact pipe 2 and a second contact pipe 3 connected end to end. The first contact pipe 2 abuts against the outer wall of the motor 1, and the second contact pipe 3 is suspended relative to the motor 1. Both the second contact pipe 3 and the first contact pipe 2 are arranged along the axial direction of the motor 1.

[0055] The performance and size optimization methods are as follows: Figure 2 As shown, it includes the following steps:

[0056] Step S1: Bend the second contact tube 3 at the connection between the first contact tube 2 and the second contact tube 3, and obtain the additional volume required for installing the heat pipe based on the bending angle and length of the second contact tube 3 at the current moment and the radius of the motor 1.

[0057] Step S2: Obtain the performance-volume ratio of the heat pipe based on a preset equivalent thermal conductivity curve and the additional volume.

[0058] Step S3: Obtain an optimized bending angle based on the performance-volume ratio and bending angle, and bend the second contact tube 3 to the optimized bending angle.

[0059] Specifically, in this embodiment, considering that heat pipes usually need to be bent into different angles before being installed in motor 1, while bending the heat pipe can reduce the additional volume required during installation, it will affect the performance of the heat pipe and thus reduce the equivalent thermal conductivity of the heat pipe. This method can find an optimal bending angle so that the heat pipe is in the optimal balance between performance and additional volume.

[0060] Preferably, considering that the additional volume of the heat pipe is related to the bending angle and length of the second contact tube 3 and the radius of the motor 1, and that the equivalent thermal conductivity of the heat pipe is related to the bending angle of the second contact tube 3, this method only processes the three variables of the bending angle, length and radius of the motor 1 to obtain the optimized bending angle, so as to minimize the number of variables, weaken the influence of other variables and improve the accuracy of the optimized bending angle.

[0061] Preferably, the optimal balance between performance and additional volume of the heat pipe is found by using the performance-to-volume ratio. When the performance-to-volume ratio is at its maximum value, it means that the optimal balance has been found. At this time, the bending angle of the second contact tube 3 is the optimal optimized bending angle.

[0062] Preferably, before step S1, the central axes of the first contact tube 2 and the second contact tube 3 are on the same straight line and the second contact tube 3 does not make contact with the motor 1.

[0063] Preferably, the first contact tube 2 and the second contact tube 3 are connected in an integral manner, that is, the first contact tube 2 and the second contact tube 3 together form the heat pipe as a whole.

[0064] Preferably, the first contact tube 2 is the evaporation zone of the heat pipe, and the second contact tube 3 is the condensation zone of the heat pipe.

[0065] Preferably, the equivalent thermal conductivity curve is obtained in advance through testing.

[0066] In a preferred embodiment of the present invention, the bending angle is the angle between the second contact tube 3 before bending and the second contact tube 3 after bending.

[0067] Specifically, in this embodiment, in order to avoid others misunderstanding the bending angle as the angle between the first contact tube 2 and the second contact tube 3, a unified definition is given to the bending angle, namely the angle between the second contact tube 3 before bending and the second contact tube 3 after bending.

[0068] In a preferred embodiment of the present invention, such as Figure 3 As shown, step S1 includes:

[0069] Step S11: Bend the second contact tube 3 and determine whether the bending angle of the second contact tube 3 at the current moment is within a preset angle range:

[0070] If so, proceed to step S12;

[0071] If not, proceed to step S13;

[0072] Step S12: Based on the bending angle and length of the second contact tube 3 and the radius of the motor 1, obtain an axial volume 4 and a first radial volume 5 required for installing the heat pipe, and use the sum of the axial volume 4 and the first radial volume 5 as the additional volume.

[0073] Step S13: Based on the bending angle and length of the second contact tube 3 and the radius of the motor 1, a second radial volume 6 required for installing the heat pipe is obtained, and the second radial volume 6 is used as an additional volume.

[0074] Specifically, in this embodiment, considering that the bending angle of the second contact tube 3 is not greater than 90 degrees, it involves the calculation of the axial volume 4. Therefore, step S11 is first used to determine whether the bending angle is within the angle range. Based on the determination result, different steps are used to obtain the corresponding additional volume, making the entire process of step S1 more organized and reasonable.

[0075] Preferably, in the specific judgment process, when the bending angle is within the angle range of [0, 90], the calculation of axial volume 4 is involved. It is necessary to add axial volume 4 and first radial volume 5 to obtain the corresponding sum value, and use the sum value as the additional volume. When the bending angle is within the angle range of [90, 180], the calculation of axial volume 4 is not involved, and the second radial area 6 can be used as the additional volume.

[0076] Preferably, the first radial volume 5 and the second radial volume 6 can be equal.

[0077] In a preferred embodiment of the present invention, in step S12, the additional volume is obtained by the following calculation formula:

[0078] V = 2πrl 2 sinα+πl 3 sin 2 α+2πrl 2 sinαcosα+πl 3 sin 2 αcosα+πlr 2 cosα

[0079] in,

[0080] V represents the additional volume;

[0081] r represents the radius of motor 1;

[0082] ɑ represents the bending angle of the second contact tube 3;

[0083] l represents the length of the second contact tube 3.

[0084] In a preferred embodiment of the present invention, in step S13, the additional volume is obtained by the following calculation formula:

[0085] V=πl 3 sin 2 α+2πrl 2 sinα

[0086] in,

[0087] V represents the additional volume;

[0088] r represents the radius of motor 1;

[0089] ɑ represents the bending angle of the second contact tube 3;

[0090] l represents the length of the second contact tube 3.

[0091] In a preferred embodiment of the present invention, the relationship expression of the equivalent thermal conductivity curve in step S2 is as follows:

[0092] λ(α)=268483-944α-0.3854α 2

[0093] in,

[0094] λ(α) represents the equivalent thermal conductivity of the heat pipe;

[0095] ɑ represents the bending angle of the second contact tube 3.

[0096] In a preferred embodiment of the present invention, such as Figure 4 As shown, step S3 includes:

[0097] Step S31: Determine whether the bending angle of the second contact tube 3 is less than a preset angle.

[0098] If so, proceed to step S32;

[0099] If not, proceed to step S33;

[0100] Step S32: Determine whether the radius of motor 1 is less than a preset threshold.

[0101] If not, then 90 degrees will be used as the optimized bending angle, and the second contact tube 3 will be bent to the optimized bending angle, and then the process will be exited.

[0102] If so, then take 0 degrees as the optimized bending angle, bend the second contact tube 3 to the optimized bending angle, and then exit;

[0103] Step S33: Use 180 degrees as the optimized bending angle and bend the second contact tube 3 to the optimized bending angle.

[0104] Specifically, in this embodiment, the bending angle of the second contact tube 3 and the radius of the motor 1 are both determined to find the appropriate optimized bending angle based on different bending angles and the radius of the motor 1. The optimal optimized bending angle can be found more accurately through the dual determination.

[0105] Preferably, in the specific judgment process, when the bending angle is less than the preset angle and the radius is not less than the preset threshold, it means that the motor 1 has a small length-to-diameter ratio. When the bending angle is 90 degrees, the performance-to-volume ratio is at its maximum value. Therefore, 90 degrees is the optimal optimized bending angle. When the bending angle is less than the preset angle but the radius is less than the preset threshold, it means that the motor 1 has a large length-to-diameter ratio. When the bending angle is 0 degrees, the performance-to-volume ratio is at its maximum value. Therefore, 0 degrees is the optimal optimized bending angle. When the bending angle is greater than the preset angle, there is no need to compare the radius with the preset threshold. When the bending angle is 180 degrees, the performance-to-volume ratio is at its maximum value. Therefore, 180 degrees is the optimal optimized bending angle.

[0106] Specifically, in this embodiment, when the heat pipe has limited radial installation space, a bending angle of 0 degrees or a small angle should be used; when the heat pipe has limited axial installation space, a bending angle of 90 degrees or 180 degrees should be used. Specifically, when the heat load of motor 1 is large, in order to ensure better thermal performance, the heat pipe should use a 90-degree bending angle, while when the heat load of motor 1 is small, the heat pipe should preferably use a 180-degree bending angle; when the heat pipe has both limited radial installation space and limited axial installation space, the heat pipe should use a 180-degree bending angle, at which point the sum of the axial volume 4 and the radial volume is minimized.

[0107] In a preferred embodiment of the present invention, the preset threshold is:

[0108] Specifically, in this embodiment, the preset threshold is set to the length of the second contact tube 3. times.

[0109] While the disclosure is as stated above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this invention.

Claims

1. A method for optimizing the performance and volume of a motor heat pipe, characterized in that, At least one heat pipe is pre-laid on the outer circumference of the motor along the radial direction of the motor. The heat pipe includes a first contact pipe and a second contact pipe connected end to end. The first contact pipe abuts against the outer wall of the motor, and the second contact pipe is suspended relative to the motor. Both the second contact pipe and the first contact pipe are arranged along the axial direction of the motor. The performance and size optimization method includes the following steps: Step S1: Bend the second contact tube at the connection between the first contact tube and the second contact tube, and obtain the additional volume required to install the heat pipe based on the bending angle and length of the second contact tube at the current moment and the radius of the motor. The bending angle is the angle between the second contact tube before bending and the second contact tube after bending. Step S2: Obtain a performance-volume ratio of the heat pipe based on a preset equivalent thermal conductivity curve and the additional volume; Step S3: Obtain an optimized bending angle based on the performance-volume ratio and the bending angle, and bend the second contact tube to the optimized bending angle; Step S1 includes: Step S11: Bend the second contact tube and determine whether the bending angle of the second contact tube at the current moment is within a preset angle range. If so, proceed to step S12; If not, proceed to step S13; Step S12: Based on the bending angle and length of the second contact tube and the radius of the motor, obtain an axial volume and a first radial volume required for installing the heat pipe, and use the sum of the axial volume and the first radial volume as the additional volume; Step S13: Based on the bending angle and length of the second contact tube and the radius of the motor, a second radial volume required for installing the heat pipe is obtained, and the second radial volume is used as the additional volume; Step S3 includes: Step S31: Determine whether the bending angle of the second contact tube is less than a preset angle. If so, proceed to step S32; If not, proceed to step S33; Step S32: Determine whether the radius of the motor is less than a preset threshold. If not, then 90 degrees is taken as the optimized bending angle, and the second contact tube is bent to the optimized bending angle, and then the process is exited; If so, then 0 degrees is taken as the optimized bending angle, and the second contact tube is bent to the optimized bending angle, and then the process is exited; Step S33: Use 180 degrees as the optimized bending angle, and bend the second contact tube to the optimized bending angle.

2. The performance and volume optimization method according to claim 1, characterized in that, In step S12, the additional volume is obtained using the following calculation formula: ； in, Indicates the additional volume; The radius of the motor is indicated; This indicates the bending angle of the second contact tube; This indicates the length of the second contact tube.

3. The performance and volume optimization method according to claim 1 or 2, characterized in that, In step S13, the additional volume is obtained using the following calculation formula: ； in, Indicates the additional volume; The radius of the motor is indicated; This indicates the bending angle of the second contact tube; This indicates the length of the second contact tube.

4. The performance and volume optimization method according to claim 1, characterized in that, In step S2, the relationship expression of the equivalent thermal conductivity curve is as follows: ； in, This represents the equivalent thermal conductivity of the heat pipe; This indicates the bending angle of the second contact tube.

5. The performance and volume optimization method according to claim 1, characterized in that, The preset threshold is ,in, This indicates the length of the second contact tube.

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