Self-adaptive cooling system for armature of high-force electrodynamic shaking platform and control method

Abstract

A self-adaptive cooling system for an armature of a high-force electrodynamic shaking platform, comprising: a water tank (11), a filter (8), a hydraulic pump (9), a driving coil and a heat exchanger (10), which are sequentially connected in series by means of pipelines to form a circulation loop, the hydraulic pump (9) being equipped with a driving motor (7), and the driving coil having a spiral tubular structure, with a first water inlet and outlet port (4) and a second water inlet and outlet port (3) formed at both ends, respectively, and a third water inlet and outlet port (1) provided at the center. The cooling system further comprises: a three-position, four-way reversing valve (5) disposed on a pipeline connecting the hydraulic pump (9) and the driving coil, and three temperature sensors (2) disposed at the three water inlet and outlet ports (1, 3, 4), respectively; a current sensor disposed on the driving coil; and a controller used to change the rotating speed of the driving motor (7) and the flow direction of water flow in the driving coil. The cooling system is capable of adaptively adjusting the rotating speed of the driving motor (7) and controlling the flow of cooling water, thereby improving the utilization efficiency of the cooling system.

Description

An adaptive cooling system and control method for the dynamic coil of a large-thrust electric vibration table Technical Field

[0001] The present invention relates to the technical field of vibration platforms, and more particularly to an adaptive cooling system and control method for a dynamic coil of a large-thrust electric vibration platform. Background Art

[0002] Electrodynamic shakers are primarily used to simulate the vibration dynamic environment of a test piece and test its reliability and durability in such environments. They are widely used in aerospace, marine vehicles, rail transit, engineering machinery, and other fields. Due to the high operating current density of components such as the dynamic winding, excitation winding, and short-circuit ring, electrodynamic shakers often generate significant heat during operation. Without proper cooling to dissipate the heat, the coil temperature will gradually rise over a short period of time, eventually burning out and causing equipment shutdown. Therefore, electrodynamic shakers generally have ventilation or water cooling systems. Ventilation cooling systems are primarily used for low-thrust electrodynamic shakers, while water cooling systems are primarily used for high-thrust electrodynamic shakers.

[0003] For high-thrust electric vibrators with water (distilled water) cooling for the working coils, the coils are all hollow coils for water cooling. Currently, high-thrust electric vibrators typically cool the drive coils by supplying a constant flow of cooling water. However, as the vibrator's power increases, the following problems arise: ① The cooling water is low at the drive coil inlet, resulting in a good cooling effect. However, as it circulates to the outlet, the water temperature rises, reducing the cooling effect. This results in uneven cooling of the drive coils and a large temperature difference between the inlet and outlet of the drive coils. ② The heat generated by the drive coils during operation varies with load. Using a constant, high flow rate for cooling results in wasted energy.

[0004] In view of this, it is necessary to improve the working mode of the large-thrust electric vibration table in the existing technology to solve the above problems.

[0005] Summary of the Invention

[0006] The purpose of the present invention is to disclose an adaptive cooling system and control method for the dynamic coil of a large-thrust electric vibration table to solve the above-mentioned technical problems. By adding a three-position four-way reversing valve to exchange the water inlet and outlet of the drive coil, the temperature difference between the water inlet and outlet of the drive coil is reduced. At the same time, by adaptively adjusting the speed of the drive motor, the flow of the cooling system is controlled, thereby improving the utilization efficiency of the cooling system.

[0007] To achieve the above objectives, the present invention provides an adaptive cooling system for the dynamic coil of a large-thrust electric vibration table. The cooling system includes a water tank, a filter, a hydraulic pump, a drive coil, and a heat exchanger connected in series via a pipeline to form a circulation loop. The hydraulic pump is equipped with a drive motor. The drive coil has a spiral tubular structure with a first water inlet and a second water inlet and outlet formed at both ends, and a third water inlet and outlet in the center. The cooling system also includes:

[0008] a three-position, four-way reversing valve, arranged on the pipeline connecting the hydraulic pump and the drive coil, having four ports, P, A, B, and T, wherein port P is connected to the water outlet of the hydraulic pump via a pipeline, port A is connected to the first and second water inlet and outlet of the drive coil via a pipeline, port B is connected to the third water inlet and outlet via a pipeline, and port T is connected to the water inlet of the heat exchanger via a pipeline;

[0009] Temperature sensor 1, temperature sensor 2 and temperature sensor 3 are respectively arranged at the water inlet and outlet 1, water inlet and outlet 2 and water inlet and outlet 3;

[0010] a current sensor, arranged on the driving coil, for monitoring the driving current of the driving coil;

[0011] The controller is used to receive the collected data from the temperature sensor and the current sensor, and control the three-position four-way reversing valve and the drive motor to change the speed of the drive motor and the flow direction of the water in the drive coil.

[0012] The present invention also discloses a control method for a dynamic adaptive cooling system of a large-thrust electric vibration table, comprising the following steps:

[0013] S1, when the vibration table is in working state, the temperature T of the water inlet and outlet 1, water inlet and outlet 2 and water inlet and outlet 3 of the driving coil are detected in real time through temperature sensor 1, temperature sensor 2 and temperature sensor 3. in1 、T in2 、T out ;

[0014] S2, detecting the actual current I of the driving coil through the current sensor e , preset the minimum current intensity threshold λ low *I n With the highest threshold λ high *I n , compare the actual current of the driving coil I e With the lowest threshold λ low *I n , the highest threshold λ high *I n The size of the drive motor is adjusted for the first time;

[0015] S3, determining whether the speed of the drive motor reaches the rated speed n, and if the speed of the drive motor does not reach the rated speed n, adjusting the speed of the drive motor again;

[0016] S4, when the speed of the driving motor reaches the rated speed n, and the temperature value T of the inlet and outlet three is detected out Exceed the water inlet and outlet by one T in1 , Water inlet and outlet two T in2 When the average temperature value reaches above ΔT2, the three-position four-way reversing valve is controlled to change the direction of the inlet and outlet of the cooling system to complete the reversal of the cooling water in the drive coil.

[0017] As a further improvement of the present invention, in the step S1, by comparing T avg With T lim The size of the cooling system determines whether to enable the cooling system.

[0018] When T avg ≤T lim When , the cooling system is not enabled;

[0019] When T avg >T lim When the cooling system is turned on;

[0020] Where T lim is the temperature threshold set according to the actual device, T avg is the average temperature of the water inlet and outlet of the driving coil

[0021] As a further improvement of the present invention, in step S2, the adjustment method is specifically as follows:

[0022] When I e ≤λ low % I n When the speed of the drive motor is adjusted to λ of the rated speed low *n;

[0023] When λ low % I n <I e ≤λ high % I n When the speed of the drive motor is adjusted to λ of the rated speed high *n;

[0024] When I e >λ high % I n When the speed of the drive motor is adjusted to the rated speed n.

[0025] As a further improvement of the present invention, in the step S3, the speed of the driving motor is adjusted again as follows: S31, re-adjust the temperature T of the water inlet and outlet 1, water inlet and outlet 2 and water inlet and outlet 3 of the driving coil. in1 、T in2 、T out Conduct testing;

[0026] S32, after the time Δt has passed, the average temperature T of the water inlet and outlet of the drive coil is detected. avg Whether ΔT1 is increased;

[0027] S33, if ΔT1 increases, increase the driving motor speed by δ%n;

[0028] S34, continue to compare whether the speed of the drive motor reaches the rated speed n, and if it reaches or exceeds the rated speed n, adjust the speed of the drive motor to the rated speed n;

[0029] If the rated speed n is still not reached, the steps S31, S32, and S33 are repeated in sequence until the speed of the drive motor reaches or exceeds the rated speed n;

[0030] Where Δt and ΔT1 are the time and temperature values ​​set according to the actual equipment, and δ is the motor speed increment set according to the actual equipment.

[0031] As a further improvement of the present invention, the step S5 is further included to continue to detect the temperature T of the water inlet and outlet 1, the water inlet and outlet 2 and the water inlet and outlet 3 of the driving coil in real time. in1 、T in2 、T out ; When (T in1 +T in2 ) / 2-T out >ΔT2, the three-position four-way reversing valve is controlled to reverse again, changing the direction of the water inlet and outlet of the cooling system, and repeating the steps S4 and S5 in sequence.

[0032] As a further improvement of the present invention, the T lim Between 25℃ and 40℃.

[0033] As a further improvement of the present invention, the low Between 20 and 40, the λ high Between 60 and 80.

[0034] As a further improvement of the present invention, the Δt is between 10-20s, the ΔT1 is between 5°C and 10°C, the ΔT2 is between 10°C and 20°C, and the δ is between 10 and 20.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The invention relates to an adaptive cooling system for a dynamic coil of a large-thrust electric vibration table. The system realizes adjustment of the water inlet and outlet directions of the driving coil by combining a driving coil with a first water inlet and outlet, a second water inlet and outlet, and a third water inlet and outlet, a three-position four-way reversing valve, a temperature sensor, a current sensor and a controller. At the same time, the working current of the driving coil is detected by the current sensor, and the controller adjusts the rotation speed of the driving motor to make it more in line with the actual use condition of the equipment, thereby improving the utilization efficiency of resources. The control method of the cooling system can adaptively adjust the rotation speed of the driving motor according to the temperature change of the driving coil of the electric vibration table during operation, thereby controlling the flow of the cooling system and improving the utilization efficiency of the cooling system. In order to avoid the situation where the temperature difference between the water inlet and outlet of the driving coil is too large when the cooling system of the electric vibration table is operating, the water inlet and outlet are exchanged by adding a three-position four-way reversing valve, thereby reducing the temperature difference between the water inlet and outlet of the driving coil. The method of the invention is clever, easy to operate, convenient to maintain, highly adaptable and highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG1 is a schematic diagram of an adaptive cooling system for a moving coil of a high-thrust electric vibration table according to the present invention;

[0038] FIG2 is a schematic structural diagram of a driving coil in an adaptive cooling system for a dynamic coil of a high-thrust electric vibration table according to the present invention;

[0039] FIG3 is a flow chart of an adaptive cooling system and control method for a dynamic coil of a high-thrust electric vibration table according to the present invention.

[0040] In the figure: 1. Water inlet and outlet three; 2. Temperature sensor; 3. Water inlet and outlet two; 4. Water inlet and outlet one; 5. Three-position four-way reversing valve; 6. Overflow valve; 7. Drive motor; 8. Filter; 9. Hydraulic pump; 10. Heat exchanger; 11. Water tank. DETAILED DESCRIPTION

[0041] The present invention is described in detail below with reference to the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in this field based on these embodiments are all within the scope of protection of the present invention.

[0042] Please refer to FIG. 1 to FIG. 3 , which show a specific embodiment of a large-thrust electric vibration table dynamic coil adaptive cooling system of the present invention.

[0043] A high-thrust electric vibration table dynamic adaptive cooling system, the cooling system includes a water tank 11, a filter 8, a hydraulic pump 9, a drive coil and a heat exchanger 10, which are connected in series through a pipeline to form a circulation loop. The hydraulic pump 9 is a fixed-displacement pump and is equipped with a drive motor 7. The outlet branch is connected to a relief valve 6. The drive coil has a spiral tubular structure, with a water inlet and outlet 1 4 and a water inlet and outlet 2 3 formed at both ends, and a water inlet and outlet 3 1 in the center. The cooling system also includes: a three-position four-way reversing valve 5, which is arranged on the pipeline connecting the hydraulic pump 9 and the drive coil, and has four ports P, A, B, and T. Among them, the P port is connected to the water outlet of the hydraulic pump 9 through a pipeline. Port A is connected to the water inlet and outlet 1 4 and water inlet and outlet 2 3 of the driving coil through a pipeline, port B is connected to the water inlet and outlet 3 1 through a pipeline, and port T is connected to the water inlet of the heat exchanger 10 through a pipeline; temperature sensor 21, temperature sensor 22 and temperature sensor 23 are arranged at water inlet and outlet 1 4, water inlet and outlet 2 3 and water inlet and outlet 3 1 respectively; the current sensor is arranged on the driving coil for monitoring the driving current of the driving coil; the controller is used to receive the collected data of the temperature sensor 2 and the current sensor, and control the three-position four-way reversing valve 5 and the driving motor 7 to change the speed of the driving motor 7 and the flow direction of the water in the driving coil.

[0044] Its working principle is: the driving motor 7 drives the hydraulic pump 9 to provide cooling water for the driving coil. The cooling system flow can be changed by changing the servo motor speed. The cooling water enters the driving coil through the three-position four-way reversing valve 5. By reversing the three-position four-way reversing valve 5, the inlet and outlet of the driving coil cooling water can be changed. Finally, the cooling water returns to the water tank 11 through the heat exchanger 10, realizing a cooling water circuit with the best cooling effect.

[0045] The present invention also discloses a control method for a dynamic adaptive cooling system of a large-thrust electric vibration table, comprising the following steps:

[0046] S1, when the vibration table is in working state, the temperature T of the water inlet and outlet 1 4, water inlet and outlet 2 3 and water inlet and outlet 3 1 of the driving coil are detected in real time by temperature sensor 21, temperature sensor 22 and temperature sensor 23. in1 、T in2 、T out ; In step S1, by comparing T avg With T lim The size of the cooling system determines whether to enable it. avg ≤T lim When T avg >T lim When T lim is the temperature threshold set according to the actual device, T lim Between 25℃ and 40℃, Tavg is the average temperature of the water inlet and outlet of the driving coil

[0047] S2, detects the actual current I of the driving coil through the current sensor e , preset the minimum current intensity threshold λ low *I n With the highest threshold λ high *I n ,λ low Between 20 and 40, λ high Compare the actual current of the driving coil I between 60 and 80 e With the lowest threshold λ low *I n , the highest threshold λ high *I n The size of the drive motor 7 is initially adjusted; the adjustment method is as follows:

[0048] When I e ≤λ low % I n When the speed of the drive motor 7 is adjusted to λ of the rated speed low *n;

[0049] When λ low % I n <I e ≤λ high % I n When the speed of the drive motor 7 is adjusted to λ of the rated speed high *n;

[0050] When I e >λ high % I n When , the speed of the driving motor 7 is adjusted to the rated speed n.

[0051] S3, determine whether the speed of the drive motor 7 reaches the rated speed n, if the speed of the drive motor 7 does not reach the rated speed n, adjust the speed of the drive motor 7 again; the speed of the drive motor 7 is adjusted again in the following manner: S31, re-adjust the temperature T of the drive coil water inlet and outlet 1 4, water inlet and outlet 2 3 and water inlet and outlet 3 1 in1 、T in2 、T out Conduct testing;

[0052] S32, after the time Δt has passed, the average temperature T of the water inlet and outlet of the drive coil is detected. avgWhether ΔT1 is increased; S33, if ΔT1 is increased, the speed of the drive motor 7 is increased by δ% n; S34, continue to compare whether the speed of the drive motor 7 reaches the rated speed n, if it reaches or exceeds the rated speed n, adjust the speed of the drive motor 7 to the rated speed n; if it still does not reach the rated speed n, repeat steps S31, S32, and S33 in sequence until the speed of the drive motor 7 reaches or exceeds the rated speed n; wherein Δt and ΔT1 are time and temperature values ​​set according to the actual equipment, Δt is between 10-20s, ΔT1 is between 5°C and 10°C, and δ is the motor speed increment set according to the actual equipment, and δ is between 10 and 20.

[0053] S4, when the speed of the driving motor 7 reaches the rated speed n, and the temperature value T of the inlet and outlet 31 is detected out Exceeding the inlet and outlet - 4T in1 , Water inlet and outlet 2 3T in2 When the average temperature value exceeds ΔT2, and ΔT2 is between 10°C and 20°C, the three-position four-way reversing valve 5 is controlled to change the direction of the water inlet and outlet of the cooling system to complete the reversal of the cooling water in the drive coil.

[0054] The step S5 is also included, in which the temperature T of the water inlet and outlet 1 4, the water inlet and outlet 2 3 and the water inlet and outlet 3 1 of the driving coil are continuously detected in real time. in1 、T in2 、T out ; When (T in1 +T in2 ) / 2-T out When ΔT2 is higher, the three-position four-way directional valve 5 is controlled to reverse again, changing the direction of the water inlet and outlet of the cooling system, and steps S4 and S5 are repeated in sequence.

[0055] In addition, 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 embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An adaptive cooling system for a large-thrust electric vibration table moving coil, the cooling system comprising a water tank, a filter, a hydraulic pump, a driving coil and a heat exchanger connected in series through a pipeline to form a circulation loop, the hydraulic pump is equipped with a driving motor, characterized in that: The driving coil is in a spiral tubular structure, with a first water inlet and a second water inlet and a third water inlet and a third water inlet formed in the center. The cooling system also includes: A three-position four-way reversing valve is arranged on the pipeline connecting the hydraulic pump and the driving coil, and has four ports, P, A, B, and T, wherein the P port is connected to the water outlet of the hydraulic pump through a pipeline, the A port is connected to the first and second water inlet and outlet of the driving coil through a pipeline, the B port is connected to the third water inlet and outlet through a pipeline, and the T port is connected to the water inlet of the heat exchanger through a pipeline; Temperature sensor 1, temperature sensor 2 and temperature sensor 3 are respectively arranged at the water inlet and outlet 1, water inlet and outlet 2 and water inlet and outlet 3; A current sensor is arranged on the driving coil and is used to monitor the driving current of the driving coil; The controller is used to receive the collected data of the temperature sensor and the current sensor, and control the three-position four-way reversing valve and the driving motor to change the rotation speed of the driving motor and the flow direction of the water in the driving coil.

2. A control method for a dynamic adaptive cooling system of a large thrust electric vibration table, based on the dynamic adaptive cooling system of a large thrust electric vibration table according to claim 1, characterized in that: The following steps are involved: S1, when the vibration table is in working state, the temperature T of the water inlet and outlet 1, water inlet and outlet 2 and water inlet and outlet 3 of the driving coil are detected in real time through temperature sensor 1, temperature sensor 2 and temperature sensor 3. in1 , T in2 , T out ; S2, detecting the actual current I of the driving coil through the current sensor e , preset the minimum current intensity threshold λ low *I n With the highest threshold λ high *I n , compare the actual current I of the driving coil e With the minimum threshold λ low *I n , Maximum threshold λ high *I n The size of the drive motor is adjusted for the first time; S3, determining whether the speed of the driving motor reaches the rated speed n, if the speed of the driving motor does not reach the rated speed n, adjusting the speed of the driving motor again; S4, when the speed of the drive motor reaches the rated speed n, and the temperature value T of the inlet and outlet three is detected out Exceed the inlet and outlet by one T in1 , Inlet and outlet two T in2 When the average temperature value reaches above ΔT2, the three-position four-way reversing valve is controlled to change the direction of the inlet and outlet of the cooling system to complete the reversal of the cooling water in the drive coil.

3. The control method of the adaptive cooling system of the dynamic coil of a large thrust electric vibration table according to claim 2 is characterized in that: In the S1 step, by comparing T avg With T lim The size of the cooling system determines whether to enable the cooling system. When T avg ≤T lim The cooling system is not enabled; When T avg >T lim When the cooling system is turned on; Where T lim is the temperature threshold set according to the actual device, T avg is the average temperature of the water inlet and outlet of the driving coil 4. The control method of a dynamic adaptive cooling system of a large thrust electric vibration table according to claim 2 is characterized in that: In the step S2, the adjustment method is specifically as follows: When I e ≤λ low % I n When the speed of the drive motor is adjusted to λ of the rated speed low *n; When low % I n <I e ≤λ high % I n When the speed of the drive motor is adjusted to λ of the rated speed high *n; When I e >λ high % I n When the speed of the drive motor is adjusted to the rated speed n.

5. The control method of the adaptive cooling system of the dynamic coil of a large thrust electric vibration table according to claim 3 is characterized in that: In step S3, the speed of the driving motor is adjusted again as follows: S31, re-regulate the temperature T of the water inlet and outlet 1, the water inlet and outlet 2, and the water inlet and outlet 3 of the driving coil in1 , T in2 , T out Conduct testing; S32, determining the average temperature T of the water inlet and outlet of the drive coil after Δt time has passed. avg Whether ΔT1 is increased; S33, if ΔT1 is increased, the driving motor speed is increased by δ%n; S34, continue to compare whether the speed of the drive motor reaches the rated speed n, if it reaches or exceeds the rated speed n, adjust the speed of the drive motor to the rated speed n; If the rated speed n is still not reached, the steps S31, S32, and S33 are repeated in sequence until the speed of the drive motor reaches or exceeds the rated speed n; Wherein Δt and ΔT1 are the time and temperature quantities set according to the actual equipment, and δ is the motor speed increment set according to the actual equipment.

6. The control method of a dynamic adaptive cooling system of a large thrust electric vibration table according to claim 2 is characterized in that: The step S5 is also included, in which the temperature T of the water inlet and outlet 1, the water inlet and outlet 2 and the water inlet and outlet 3 of the driving coil are continuously detected in real time. in1 , T in2 , T out ; When (T in1 +T in2 ) / 2-T out >ΔT2, the three-position four-way reversing valve is controlled to reverse again, changing the direction of the water inlet and outlet of the cooling system, and the steps S4 and S5 are repeated in sequence.

7. The control method of the adaptive cooling system of the dynamic coil of a large thrust electric vibration table according to claim 3 is characterized in that: The T lim Between 25℃ and 40℃.

8. The control method of the adaptive cooling system of the dynamic coil of a large thrust electric vibration table according to claim 2 is characterized in that: The lambda low Between 20 and 40, the λ high Between 60 and 80.

9. The control method of the adaptive cooling system of the dynamic coil of a large thrust electric vibration table according to claim 5 is characterized in that: The Δt is between 10-20s, the ΔT1 is between 5°C and 10°C, the ΔT2 is between 10°C and 20°C, and the δ is between 10 and 20.

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