Sealed motor heat dissipation system and method

Abstract

The invention discloses a heat dissipation system and method for a sealed motor, and belongs to the technical field of sealed motors and transmission devices. The system comprises a motor unit, a multistage gearbox unit, a liquid cooling unit, an air cooling unit, a plurality of groups of sensors and a controller. The liquid cooling unit is integrated in the motor outer cover, and the air cooling unit is installed on the motor radiating ribs. According to the method, the total heating power and the variable target temperature of the system are dynamically calculated by collecting the current, the temperature and the rotating speed of the motor and gear signals of the gear box in real time, the required heat dissipation power is calculated in real time through a nonlinear function based on the temperature difference, and then heat dissipation resources of the air cooling unit and the liquid cooling unit are cooperatively distributed with the optimal energy efficiency ratio. According to the invention, feedforward prediction temperature control of dynamic working conditions is realized, the problems of heat dissipation lag, low energy efficiency and overheating risk of the sealed motor under complex load and multi-gear operation are solved, and the reliability, adaptability and overall energy efficiency of the system are significantly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sealed electric machines, transmission devices, and in particular to a sealed electric machine heat dissipation system and method. BACKGROUND

[0002] With the development of modern industrial equipment towards high efficiency, compactness and high power density, sealed electric machine and multi-stage planetary gearbox integrated power units have been widely used in the fields of robots, electric vehicles, aerospace, precision machine tools, etc. Such power units usually work in harsh environmental conditions, requiring good sealing and environmental adaptability. However, due to the limitation of the sealing structure, the internal heat is difficult to dissipate effectively through natural convection, resulting in significant temperature rise of the electric machine and gearbox during long-time or high-load operation, directly affecting the system reliability, efficiency and service life.

[0003] In the existing technical solutions, the heat dissipation methods for sealed electric machines mainly include the following:

[0004] For example, heat dissipation fins or ribs are provided on the motor housing, relying on air natural convection or air flow caused by equipment movement for heat dissipation. This method is simple in structure and low in cost, but the heat dissipation capacity is limited, only suitable for low-power or intermittent operation occasions, and difficult to meet the continuous high-load operation requirements.

[0005] Fixed speed or simple speed regulation fans are installed outside the motor to enhance heat dissipation by forced convection. Although the heat dissipation capacity is improved to some extent, the fan speed is usually not strongly related to the motor load, speed or temperature, and cannot match the dynamically changing thermal load in real time, resulting in response lag, high noise, and low energy efficiency when running at high power under light load.

[0006] Cooling channels are embedded in the motor housing or stator, and heat is removed by circulating cooling liquid. The liquid cooling system has strong heat dissipation capacity and uniform temperature control, but the system is usually complex and costly, and most schemes use constant flow or simple temperature control pumps, which cannot dynamically adjust the flow and heat dissipation power according to real-time working conditions, and also have the risk of excessive cooling or insufficient heat dissipation.

[0007] A bimetallic strip or a thermistor is used as a temperature control switch to start the fan or pump when the set temperature threshold is reached. This method is simple to control, but cannot predict the thermal trend, and frequent start-stop can cause temperature fluctuations, affecting the motor insulation life and control accuracy.

[0008] In addition, for the sealed motor system integrated with the multi-stage planetary gearbox, the heat dissipation problem is more complex. Due to the copper loss, iron loss and mechanical loss of the motor itself, the meshing loss and bearing friction loss of the gearbox, and the different transmission efficiencies at different gears, the loss distribution is uneven, resulting in that the total heating power of the system changes in real time with the working condition. The motor and the gearbox are tightly connected through mechanical structure, and heat is easily conducted between them. Local overheating may trigger a chain reaction. In actual application, the environmental temperature and load condition are complex and changeable, and the traditional fixed threshold temperature control is difficult to adapt to the optimized heat dissipation in the whole working condition range. SUMMARY

[0009] In summary, the application provides a sealed motor heat dissipation system and method.

[0010] The technical scheme of the application is as follows:

[0011] A sealed motor heat dissipation system, characterized in that it comprises:

[0012] A motor unit (100);

[0013] A multi-stage gearbox unit (200) in transmission connection with the motor unit (100) and having at least three switchable transmission ratio gears;

[0014] A liquid cooling unit (300) comprising a cooling flow channel, a circulating pump and a radiator arranged in the motor housing;

[0015] An air cooling unit (400) comprising a variable frequency fan mounted on the heat dissipation ribs of the motor housing;

[0016] A plurality of sensors for real-time acquisition of motor current, winding temperature, bearing temperature, gearbox gear and housing temperature, wherein

[0017] A controller dynamically calculates the total heating power of the system and the target temperature according to the data of the plurality of sensors, and adjusts the heat dissipation power distribution of the liquid cooling unit and the air cooling unit in real time.

[0018] In the application, the motor unit (100) comprises a first motor housing (101), a second motor housing (102), an arc-shaped permanent magnet ring (103), a rotor (104) and a coil (105), and the cooling flow channel of the liquid cooling unit (300) is integrated in the second motor housing (102).

[0019] In the application, the multi-stage gearbox unit (200) comprises a gearbox body (201), an input shaft (204), a clutch (205), at least three planetary gear sets and an output shaft (209).

[0020] In the application, the plurality of sensors comprise:

[0021] Temperature sensors are arranged at the end of the motor winding, front and rear bearings and gear box each gear housing;

[0022] Hall current sensors are used to collect the effective value of three-phase current of the motor;

[0023] Speed sensors or encoders are used to obtain the motor speed and gear box gear signals.

[0024] In the present application, the controller calculates the total heat generating power according to the following formula The calculation formula is as follows:

[0025]

[0026] Wherein, represents the heat generating power of the motor; represents the heat generating power of the gear box i-th gear transmission; , And represents the weighting coefficient.

[0027] In the present application, the controller dynamically sets the target temperature The formula is:

[0028]

[0029] Wherein, ; ;

[0030] In the formula, represents the reference temperature; represents the load temperature rise compensation amount; represents the speed temperature rise compensation amount; represents the load adjustment coefficient; represents the speed adjustment coefficient; represents the rated current; represents the actual rotating speed of the motor rotor; represents the rated speed.

[0031] In the present application, the controller calculates the required heat dissipation power The calculation formula is as follows:

[0032]

[0033] In the formula, represents the minimum heat dissipation power; represents the real-time temperature difference, wherein,

[0034]

[0035] Wherein, represents the actual temperature; represents the target temperature; represents the temperature difference ratio factor, which determines the response sensitivity of temperature difference change by controlling the transition width of the tanh function, represents the dynamic adjustment coefficient.

[0036] In the present application, the dynamic adjustment coefficient is composed of the following parameters:

[0037]

[0038] wherein, represents the gear influence factor, reflecting the influence of different gears on heat dissipation demand; represents the gearbox output shaft speed; represents the rated speed; L represents the load rate; a, b, and c represent weight coefficients, which generally need to satisfy a+b+c=1.

[0039] In the present application, the controller allocates the total heat dissipation demand to the air cooling unit and the liquid cooling unit, and the calculation formula is:

[0040]

[0041]

[0042] wherein, the constraint condition is: , and ;

[0043] wherein, represents the air cooling unit control power; represents the liquid cooling unit control power; represents the air cooling unit time constant; represents the liquid cooling unit time constant; represents the air cooling unit allocation function; represents the liquid cooling unit allocation function.

[0044] A sealed motor heat dissipation method, characterized in that it comprises the following steps:

[0045] Step 1: Real-time acquisition of motor current, temperature, and gear signal;

[0046] Step 2: Calculation of motor and gearbox heat generation power to obtain total heat generation power;

[0047] Step 3: Dynamic setting of target temperature;

[0048] Step 4: Calculation of required heat dissipation power based on the difference between actual temperature and target temperature;

[0049] Step 5: Distribute the heat dissipation power to the air-cooled unit and the liquid-cooled unit according to the optimal energy efficiency ratio.

[0050] The sealed motor heat dissipation system and method according to the present application have the following advantages:

[0051] Based on real-time data, the heat dissipation power is dynamically adjusted to achieve rapid response to transient large heat flow and avoid temperature overshoot. In the light load and low speed working condition, the operating temperature is moderately increased to reduce the cooling energy consumption; in the heavy load and high speed working condition, the heat dissipation is strengthened in advance to improve the overall energy efficiency of the system.

[0052] Through multi-source sensor fusion and dynamic thermal protection strategy, the overheating damage of the motor and the gear box is effectively prevented, and the service life is prolonged. The heat dissipation strategy can be automatically adjusted according to different gears, loads and speeds, and is suitable for complex and variable industrial application scenarios.

[0053] The liquid cooling channel is integrated in the motor cover, and the air-cooled fan is installed on the heat dissipation rib. The overall structure is compact and suitable for sealed power units. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 Fig. 1 is a structural schematic diagram of the sealed motor heat dissipation system according to the present application;

[0055] Figure 2 Fig. 2 is a structural schematic diagram of the sealed motor heat dissipation system according to the present application;

[0056] Figure 3 Fig. 3 is a partial structural schematic diagram of the sealed motor heat dissipation system according to the present application;

[0057] Figure 4 Fig. 4 is a partial structural schematic diagram of the sealed motor heat dissipation system according to the present application;

[0058] Figure 5 Fig. 5 is a structural block diagram of the sealed motor heat dissipation system according to the present application;

[0059] Figure 6 Fig. 6 is a structural block diagram of the sealed motor heat dissipation system according to the present application;

[0060] Figure 7 Fig. 7 is a flow chart of the sealed motor heat dissipation method according to the present application.

[0061] The reference signs are shown as follows: 100-motor unit, 101-first motor cover, 102-second motor cover, 103-arc-shaped permanent magnet ring, 104-rotor, 105-coil, 200-multi-stage gearbox unit, 201-gearbox body, 202-first bevel gear shaft, 203-second bevel gear shaft, 204-input shaft, 205-clutch, 206-first planetary gear set, 206A-first ring gear, 206B-first planetary gear, 206C-first sun gear, 206D-first retainer, 207-second planetary gear set, 207A-second ring gear, 207B-second planetary gear, 207C-second sun gear, 207D-second retainer, 208-third planetary gear set, 208A-third ring gear, 208B-third planetary gear, 208C-third sun gear, 208D-third retainer, 209-output shaft, 300-liquid cooling unit, 400-air cooling unit. DETAILED DESCRIPTION

[0062] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

[0063] Embodiment one

[0064] Reference Figures 1 to 4 As shown in the figure, the embodiment proposes a sealed motor heat dissipation system, which comprises a motor unit 100 and a multi-stage gearbox unit 200. The power of the motor unit 100 is transmitted to the required driving components through the multi-stage gearbox unit 200.

[0065] The motor unit 100 comprises a first motor cover 101 and a second motor cover 102. A plurality of arc-shaped permanent magnet rings 103 are installed in the first motor cover 101 in a circumferential and equidistant manner. A rotor 104 is also installed in the first motor cover 101. A plurality of coils 105 are wound on the rotor 104. After the plurality of coils 105 are connected to three-phase electricity, a magnetic field is generated, which cuts the magnetic field lines of the plurality of arc-shaped permanent magnet rings 103 installed in the first motor cover 101 in a circumferential and equidistant manner, thereby finally driving the rotor 104 to rotate.

[0066] Further, the multi-stage gearbox unit 200 comprises a gearbox body 201. A first bevel gear shaft 202 is arranged on one side of the gearbox body 201, and the first bevel gear shaft 202 is connected to the rotor 104.

[0067] The first bevel gear shaft 202 is engaged with a second bevel gear shaft 203 on one side. The second bevel gear shaft 203 is provided with an input shaft 204. The input shaft 204 is engaged with one of a first planetary gear set 206, a second planetary gear set 207, or a third planetary gear set 208 through a clutch 205. The third planetary gear set 208 is connected to an output shaft 209 for transmission.

[0068] In this embodiment, the motor unit 100 is the power source of the system. When three-phase alternating current is applied to the multiple sets of coils 105, a rotating magnetic field is generated. This magnetic field interacts with the multiple arc-shaped permanent magnet rings 103 that are circumferentially fixed inside the first motor housing 101, causing the rotor 104 to rotate around its axis.

[0069] The rotational power of the rotor 104 is directly transmitted to the first bevel gear shaft 202 connected to it. The first bevel gear shaft 202 meshes with the second bevel gear shaft 203 to complete a change in the direction of power and transmit the power to the input shaft 204.

[0070] The power from the input shaft 204 is transmitted via a clutch 205, which selects the transmission path. The clutch 205 can switch to three different positions, engaging with the corresponding input components of the first planetary gear set 206, the second planetary gear set 207, or the third planetary gear set 208, thereby achieving different reduction ratios.

[0071] When clutch 205 engages the first planetary gear set 206, power is reduced in the first stage through the planetary gear set; when clutch 205 engages the second planetary gear set 207, power is reduced in the second stage through the planetary gear set; when clutch 205 engages the third planetary gear set 208, power is reduced in the third stage through the planetary gear set.

[0072] Each stage of the planetary gear set consists of a ring gear, planetary gears, a sun gear, and a cage. By fixing one component and driving another, speed reduction and torque amplification are achieved. Specifically, the first planetary gear set 206 consists of a first ring gear 206A, a first planetary gear 206B, a first sun gear 206C, and a first cage 206D. The second planetary gear set 207 consists of a second ring gear 207A, a second planetary gear 207B, a second sun gear 207C, and a second cage 207D. The third planetary gear set 208 consists of a third ring gear 208A, a third planetary gear 208B, a third sun gear 208C, and a third cage 208D.

[0073] Finally, the power, after being reduced by the selected planetary gear set, is transmitted from the third planetary gear set 208 to the output shaft 209, thereby driving the required external components.

[0074] Sealed motors are often paired with multi-stage planetary gearboxes to form compact power units. Planetary gearboxes adapt to varying load and speed requirements by switching between different gears. However, the motor's output torque and current change drastically during gear shifts and between different gears, resulting in dynamic fluctuations in heat generation.

[0075] Furthermore, the transmission efficiency varies between different gears in the gearbox, resulting in different amounts of heat generation, which indirectly affects the motor's thermal environment. Common cooling solutions include fixed-speed fans or simple temperature control switches, which are slow to respond, energy-intensive, and unable to accurately match dynamic thermal loads, easily leading to motor overheating or overcooling.

[0076] Furthermore, referring to Figures 5 to 6 As shown, this embodiment proposes a sealed motor cooling system that also includes a liquid cooling unit 300 and an air cooling unit 400. The motor unit 100 is directly connected to the multi-stage gearbox unit 200 via a bushing. The multi-stage gearbox unit 200 has at least three switchable gear ratios. The liquid cooling unit 300 includes a cooling channel embedded in the second motor housing 102, a circulating pump, an external radiator, and a liquid storage tank. The air cooling unit 400 includes a variable frequency axial fan mounted on the heat dissipation fins of the first motor housing 101.

[0077] Preferably, a thermoelectric cooling element can be added and attached to the key heat-generating parts of the motor to assist in the rapid conduction of transient large heat flows.

[0078] In this embodiment, multiple temperature sensors are arranged at the ends of the motor windings, at the front and rear bearings of the motor, and near the planetary gear housings of each gearbox position to detect the temperature at the relevant locations. Hall effect current sensors monitor the three-phase input current of the motor and acquire the current gearbox position signal via speed sensors, proximity switches, or encoders.

[0079] Based on the data from the multiple sensors mentioned above, the current total heat generation power is estimated. The calculation formula is as follows:

[0080]

[0081] in, In this formula, This indicates the motor's heating power; This represents the effective value of the motor current; This indicates the stator phase resistance of the motor; This indicates the motor's efficiency at the current speed, which can be found in an efficiency table. This is a comprehensive coefficient representing the copper loss, iron loss, and wind friction loss of the motor, typically ranging from 1.2 to 1.5.

[0082] in, In this formula, This represents the heat generation power of the i-th stage of the gearbox; This represents the load distribution coefficient associated with gearbox gear position G; , This represents the input torque and speed of the i-th stage transmission; This represents the transmission efficiency of the i-th stage of the transmission.

[0083] Furthermore, , as well as The weighting coefficient represents the degree of influence of heat from each part on the temperature rise of the motor core, and is calibrated through a limited number of experiments.

[0084] The ideal operating temperature of an electric motor is not fixed; the target temperature is dynamically set according to the operating conditions. The calculation formula is expressed as:

[0085]

[0086] in, ; .

[0087] In the formula, This indicates the reference temperature, a basic temperature reference value determined based on the heat resistance grade of the motor insulation material and corrected for safety margin. This indicates the load temperature rise compensation amount, which is the negative adjustment amount made to the reference temperature due to changes in motor load; This indicates the amount of temperature rise compensation due to motor speed, representing the negative adjustment made to the reference temperature due to changes in motor speed. Indicates the load regulation coefficient; Indicates the speed adjustment coefficient; Indicates the rated current; This indicates the actual rotational speed of the motor rotor; Indicates the rated speed.

[0088] In this embodiment,

[0089] Based on reference temperature Starting from this point, as the load increases, the heat generated increases with the square of the current, therefore... The system proactively lowers the target temperature in advance to pre-dissipate the large amount of heat that will be generated, preventing temperature runaway; when the rotational speed increases, considering the increased losses, it... Actively reduce the target temperature.

[0090] Under harsh conditions such as heavy loads and high speeds, cooling can be performed in advance to ensure that the actual motor temperature is always kept within a safe range. Under light loads and low speeds, the motor is allowed to operate at a higher temperature, reducing unnecessary cooling energy consumption and improving system efficiency.

[0091] Calculate the required instantaneous heat dissipation power based on the current temperature difference. The calculation formula is as follows:

[0092]

[0093] In this formula, Indicates the minimum heat dissipation power; This indicates the real-time temperature difference. Among them,

[0094]

[0095] in, Indicates the actual temperature; Indicates the target temperature; This represents the temperature difference scaling factor, which determines the response sensitivity to temperature difference changes by controlling the transition width of the tanh function. This represents the dynamic adjustment coefficient, and further, the dynamic adjustment coefficient... The composition parameters are:

[0096]

[0097] in, This indicates the gear level influence factor, reflecting the impact of different gear levels on heat dissipation requirements; Indicates the speed of the gearbox output shaft; The rated speed is represented by L; the load factor is represented by L, which is generally the ratio of the current load to the rated load; a, b, and c represent weighting coefficients, which usually need to satisfy a+b+c=1.

[0098] Specifically, the tanh function serves to achieve a mild-to-enhanced nonlinear transient control. When < When the response is smooth, avoid over-adjustment; when > When the response is strong, the temperature rise is quickly suppressed, and the value range of 1+tanh(...) is [0, 2].

[0099] Specifically, the max function ensures that the heat dissipation power is not lower than the minimum set value. This is to prevent insufficient heat dissipation power when there is a temperature difference.

[0100] The total heat dissipation demand is allocated between the air-cooled and liquid-cooled units to achieve the optimal energy efficiency ratio. The calculation formula is as follows:

[0101]

[0102]

[0103] The constraints are as follows: Ensure that the total control power of the air-cooled and liquid-cooled units does not exceed the total heat dissipation requirements to prevent overdrive, and This ensures that the heat dissipation requirements are fully allocated to the air-cooled and liquid-cooled units, and the allocation ratio is dynamically adjusted according to the temperature difference.

[0104] In the above formula, Indicates the control power of the air-cooled unit; Indicates the control power of the liquid cooling unit; Indicates the time constant of the air-cooled unit; Indicates the time constant of the liquid cooling unit; This represents the allocation function for the air-cooled unit; This represents the liquid cooling unit allocation function.

[0105] In this embodiment, the controller is based on real-time measurements. and given Combined with predefined , , as well as ,calculate and Subsequently, the calculated power is converted into PWM duty cycle or frequency commands through a power-PWM mapping table to drive the actuators of the air-cooled and liquid-cooled units, thereby achieving optimal energy efficiency in heat dissipation control.

[0106] Example 2

[0107] Based on the above embodiments, referring to Figure 7 As shown, this embodiment further proposes a method for heat dissipation of a sealed motor, including the following steps:

[0108] Step 1: Real-time acquisition of motor current, winding temperature, gearbox gear position, and multi-point temperature signals. The following data should be collected:

[0109] Data from temperature sensors includes the temperature of the motor winding ends, the temperature of the front and rear bearings of the motor, and the temperature of the planetary gear housings for each gear in the gearbox.

[0110] RMS value of three-phase motor current from Hall current sensor ;

[0111] The motor speed n from the speed sensor or encoder and the current gear signal G from the gearbox;

[0112] Based on the current gear and load conditions, obtain the input torque of each stage of the gearbox transmission. With rotational speed .

[0113] Step 2: Calculate the motor's heating power separately. and gearbox heat generation power Then calculate the current total heat generation power. ;

[0114] Step 3: Dynamically set the target temperature based on the motor's operating status. Represented as:

[0115]

[0116] in, ; .

[0117] In the formula, This indicates the reference temperature, a basic temperature reference value determined based on the heat resistance grade of the motor insulation material and corrected for safety margin. This indicates the load temperature rise compensation amount, which is the negative adjustment amount made to the reference temperature due to changes in motor load; This indicates the amount of temperature rise compensation due to motor speed, representing the negative adjustment made to the reference temperature due to changes in motor speed. Indicates the load regulation coefficient; Indicates the speed adjustment coefficient; Indicates the rated current; This indicates the actual rotational speed of the motor rotor; Indicates the rated speed.

[0118] In this embodiment, a reference temperature is used. Starting from this point, as the load increases, the heat generated increases with the square of the current, therefore... The system proactively lowers the target temperature in advance to pre-dissipate the large amount of heat that will be generated, preventing temperature runaway; when the rotational speed increases, considering the increased losses, it... Actively reduce the target temperature.

[0119] Step 4: Calculate the required heat dissipation power Represented as:

[0120]

[0121] In this formula, Indicates the minimum heat dissipation power; This indicates the real-time temperature difference. Among them,

[0122]

[0123] in, Indicates the actual temperature; Indicates the target temperature; This represents the temperature difference scaling factor, which determines the response sensitivity to temperature difference changes by controlling the transition width of the tanh function. This represents the dynamic adjustment coefficient, and further, the dynamic adjustment coefficient... The composition parameters are:

[0124]

[0125] in, This indicates the gear level influence factor, reflecting the impact of different gear levels on heat dissipation requirements; Indicates the speed of the gearbox output shaft; The rated speed is represented by L; the load factor is represented by L, which is generally the ratio of the current load to the rated load; a, b, and c represent weighting coefficients, which usually need to satisfy a+b+c=1.

[0126] Specifically, the tanh function serves to achieve a mild-to-enhanced nonlinear transient control. When < When the response is smooth, avoid over-adjustment; when > When the response is strong, the temperature rise is quickly suppressed, and the value range of 1+tanh(...) is [0, 2].

[0127] Specifically, the max function ensures that the heat dissipation power is not lower than the minimum set value. This is to prevent insufficient heat dissipation power when there is a temperature difference.

[0128] Step 5: Allocate the total heat dissipation demand to the air-cooled and liquid-cooled units according to the optimal energy efficiency ratio. The calculation formula is as follows:

[0129]

[0130]

[0131] The constraints are as follows: Ensure that the total control power of the air-cooled and liquid-cooled units does not exceed the total heat dissipation requirements to prevent overdrive, and This ensures that the heat dissipation requirements are fully allocated to the air-cooled and liquid-cooled units, and the allocation ratio is dynamically adjusted according to the temperature difference.

[0132] In the above formula, Indicates the control power of the air-cooled unit; Indicates the control power of the liquid cooling unit; Indicates the time constant of the air-cooled unit; Indicates the time constant of the liquid cooling unit; This represents the allocation function for the air-cooled unit; This represents the liquid cooling unit allocation function.

[0133] In this embodiment, the controller is based on real-time measurements. and given Combined with predefined , , as well as ,calculate and Subsequently, the calculated power is converted into PWM duty cycle or frequency commands through the power-PWM mapping table to drive the actuators of the air-cooled and liquid-cooled units. At the same time, the temperature changes of each part are continuously monitored, and the system dynamically returns to step 1 to form a closed-loop control, thereby realizing the adaptive adjustment of the heat dissipation system.

[0134] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sealed motor heat dissipation system, characterized in that, Comprise: A motor unit (100); A multi-stage gearbox unit (200) in driving connection with the motor unit (100) and having at least three switchable gear ratio gears; A liquid cooling unit (300) comprising a cooling flow channel, a circulating pump and a radiator arranged in the motor housing; An air cooling unit (400) comprising a variable frequency fan mounted on the motor housing cooling ribs; A plurality of sensors for real-time acquisition of motor current, winding temperature, bearing temperature, gearbox gear and housing temperature, wherein, A controller dynamically calculates the total heat generation power of the system and the target temperature according to the data of the plurality of sensors, and adjusts the heat dissipation power distribution of the liquid cooling unit and the air cooling unit in real time.

2. The sealed motor heat sink system of claim 1, wherein, The motor unit (100) comprises a first motor housing (101), a second motor housing (102), an arc-shaped permanent magnet ring (103), a rotor (104) and a coil (105), and the cooling flow channel of the liquid cooling unit (300) is integrated in the second motor housing (102).

3. The sealed motor heat sink system of claim 1, wherein, The multi-stage gearbox unit (200) comprises a gearbox body (201), an input shaft (204), a clutch (205), at least three planetary gear sets and an output shaft (209).

4. The sealed motor heat sink system of claim 1, wherein, The plurality of sensors comprise: Temperature sensors arranged at the ends of the motor windings, front and rear bearings and gearbox gear housings; Hall current sensors for acquiring three-phase current effective values of the motor; Speed sensors or encoders for obtaining motor speed and gearbox gear signals.

5. The sealed motor heat sink system of claim 1, wherein, The controller calculates the total heating power according to the following formula The calculation formula is as follows: wherein represents the heat generation power of the motor; represents the heat generation power of the i-th stage transmission of the gearbox; , and represents a weighting factor.

6. The sealed motor heat sink system of claim 1, wherein, The controller dynamically sets a target temperature The formula is: wherein ; ; In the formula, represents a reference temperature; represents a load temperature rise compensation amount; represents a rotation speed temperature rise compensation amount; represents a load adjustment coefficient; represents a rotation speed adjustment coefficient; represents a rated current; represents an actual rotation speed of a motor rotor; represents a rated rotation speed.

7. The sealed motor heat sink system of claim 1, wherein, The controller calculates the required heat dissipation power The calculation formula is as follows: In this formula, represents the minimum heat dissipation power; represents the real-time temperature difference, wherein, wherein, represents an actual temperature; represents a target temperature; represents a temperature difference ratio factor, which determines the response sensitivity of the temperature difference change by controlling the transition width of the tanh function, represents a dynamic adjustment coefficient.

8. The sealed motor heat sink system of claim 7, wherein, The dynamic adjustment coefficient The composition parameters of the dynamic adjustment coefficient are: wherein, represents a gear influence factor, reflecting the influence of different gears on heat dissipation demand; represents the gear box output shaft speed; represents the rated speed; L represents the load rate; a, b, and c represent weight coefficients, which generally need to satisfy a+b+c=1.

9. The sealed motor heat sink system of claim 1, wherein, The controller distributes the total heat dissipation requirement to the air cooling unit and the liquid cooling unit, and the calculation formula is: wherein the constraints are: , and ; wherein, represents the air-cooled unit control power; represents the liquid-cooled unit control power; represents the air-cooled unit time constant; represents the liquid-cooled unit time constant; represents the air-cooled unit distribution function; represents the liquid-cooled unit distribution function.

10. A method for sealing a motor cooling system, comprising the sealing motor cooling system of claim 1, wherein, Comprise the following steps: Step 1: Real-time acquisition of motor current, temperature and gear signals; Step 2: Calculate the heat generation power of the motor and the gearbox to obtain the total heat generation power; Step 3: Dynamically set the target temperature; Step 4: Calculate the required heat dissipation power based on the difference between the actual temperature and the target temperature; Step 5: Distribute the heat dissipation power to the air cooling unit and the liquid cooling unit according to the optimal energy efficiency ratio.

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