A mine-used permanent magnet motor life-oriented parameter design method and device, electronic equipment and medium

Abstract

The application discloses a kind of mine permanent magnet motor life-oriented parameter design method, device, electronic equipment and medium, belongs to permanent magnet motor protection and life design technical field.The method first obtains the operating parameter of mine permanent magnet motor, structure parameter and mine dust environment parameter, and determines life target criterion;Then establish equivalent leakage flow model, dust deposition amount model and thermal resistance deterioration model, according to the thermal resistance change caused by dust deposition Calculation temperature rise parameter and working temperature parameter of stator winding insulation area;Further establish the life attenuation model with insulation life as main, bearing life as auxiliary, obtain comprehensive life index;Finally, according to life target criterion, the sealing gap, equivalent leakage flow and minimum heat dissipation area are constrained design, and the mine permanent magnet motor parameter design result meeting the life requirement is output.The application can improve the operation reliability and life design rationality of mine permanent magnet motor in dust environment.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet motor protection and life design technology, and more specifically to a method, device, electronic device and medium for designing life-guiding parameters of a mining permanent magnet motor. Background Technology

[0002] Permanent magnet motors are widely used in mining transportation, underground ventilation, and heavy-duty drive applications due to their advantages such as high efficiency, high power density, and compact structure. Mining operations are typically characterized by high dust concentrations, long continuous operating times, and complex ambient temperatures. External dust can easily enter the motor through assembly gaps, end cover connections, and ventilation paths, gradually accumulating at the winding ends, insulation areas, and heat dissipation channels. Dust accumulation alters the internal heat dissipation path and heat exchange conditions of the motor, thus affecting the temperature rise of critical components and its long-term service life. Therefore, how to rationally design permanent magnet motor parameters for dusty mining environments has become a crucial issue in this field.

[0003] To address the challenges of heat dissipation, protection, and lifespan of permanent magnet motors (PMMs) in special environments, existing technologies primarily focus on heat dissipation structure design, environmental adaptability design, and cooling system improvements. Firstly, structural improvements related to heat dissipation and dust protection for PMMs have been extensively studied. For example, patent document CN105322700A, "Permanent Magnet Synchronous Motor with High Heat Dissipation Performance," utilizes structural design to prevent humid air or dust from corroding the stator, rotor, and other components, while simultaneously improving heat dissipation efficiency, thereby enhancing the operating condition of the PMM. Secondly, regarding the impact of dust on heat dissipation structures, some patent documents have addressed the issue from the perspective of synergistic heat dissipation and dust removal. For instance, patent document CN115987018A, "A Dual-Effect Heat Dissipation Permanent Magnet Motor," employs a heat dissipation structure, a tapping dust removal component, and a pitch-changing component to clean the heat dissipation channels and internal fan of the PMM, accelerating motor heat dissipation. Thirdly, improvements to the cooling system, focusing on the relationship between motor temperature rise and lifespan, have also received considerable attention. For example, in patent document CN110571981A, "A system and working method for cooling a permanent magnet motor based on high thermal conductivity materials", the temperature rise of the motor is controlled by enhancing the cooling capacity, and the life of the rotor permanent magnet and winding insulation is extended.

[0004] While these solutions have some effect, they have the following shortcomings: 1) Design separation: Protection design and heat dissipation design are often carried out separately, without considering the dynamic deterioration effect of dust deposition on heat dissipation capacity; 2) Experience-driven: Design parameters (such as the size of sealing gaps and heat dissipation area) are mostly selected based on experience, lacking quantitative correlation with clear life targets; 3) Lack of foresight: It is impossible to quantitatively predict whether the long-term operating life of the motor can meet the requirements in a specific dust environment during the design stage.

[0005] Therefore, there is an urgent need for a design method that can integrate and quantitatively correlate dust environment, protective structure, heat dissipation capacity and life target during the design stage, so as to fundamentally improve the operational reliability and life design rationality of mining permanent magnet motors in harsh environments. Summary of the Invention

[0006] In view of the above problems, the present invention provides a life-guiding parameter design method for mining permanent magnet motors based on dust deposition and thermal resistance degradation constraints. By establishing a quantitative correspondence between mining dust environmental parameters, equivalent leakage flow rate, dust deposition amount, thermal resistance degradation amount, stator winding insulation area temperature rise and lifespan decay, the influence of dust deposition is transformed into thermal and life constraints in life-guiding parameter design, thereby achieving the coordinated determination and optimization of protection parameters and heat dissipation parameters for mining permanent magnet motors.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] In a first aspect, embodiments of the present invention provide a method for designing life-guiding parameters for a mining permanent magnet motor, comprising: S1. Parameter acquisition steps: Acquire the operating parameters, structural parameters, mining dust environment parameters, and life preset parameters of the mining permanent magnet motor; S2. Target criterion step: Establish a lifespan constraint criterion based on the preset lifespan parameters; S3. Deposition and thermal resistance modeling steps: Based on the structural parameters and mining dust environment parameters, establish a first mapping relationship from the sealing gap to the equivalent leakage flow rate, and a second mapping relationship from the equivalent leakage flow rate, operating parameters, and mining dust environment parameters to the dust deposition amount; based on the dust deposition amount, establish a third mapping relationship that dust deposition leads to the deterioration of the motor's equivalent thermal resistance. S4. Temperature rise calculation steps: Based on the deteriorated equivalent thermal resistance obtained from the third mapping relationship and the loss parameters in the operating parameters, calculate the operating temperature of the stator winding insulation area. S5. Life assessment steps: Based on the operating temperature, the operating parameters and the amount of dust deposition, calculate the stator winding insulation life and bearing life respectively, and use the minimum of the two as the comprehensive life index to verify whether the life constraint criterion is met. S6. Parameter inverse design steps: Using the life constraint criterion as the boundary condition, solve the mapping and calculation relationships in S3, S4 and S5 simultaneously, and solve in reverse to obtain the design value of the sealing gap and the design value of the heat dissipation area required to meet the life requirements. S7. Result Output Step: Output the parameter design results, including the design value of the sealing gap and the design value of the heat dissipation area.

[0009] In one embodiment, in step S1: Operating parameters include motor speed Rated torque Load torque Continuous running time Motor power loss Initial equivalent thermal resistance in a clean state and equivalent convective heat transfer coefficient ; Structural parameters include sealing gap ; Environmental parameters for mining dust include ambient temperature. Environmental dust mass concentration Dust characteristic particle size and the pressure difference between the inside and outside of the motor ; Lifespan preset parameters include: setting preset lifespan requirements. Bearing base life Reference life and reference temperature .

[0010] In one embodiment, step S2 specifically includes: Based on the life design requirements of permanent magnet motors for mining, a comprehensive life constraint criterion and a comprehensive life index are established. satisfy:

[0011] And define the life margin factor. for:

[0012] Therefore, there is

[0013] in, This represents the overall lifespan index. Indicates the preset lifespan requirement. This represents the life margin coefficient.

[0014] In one embodiment, in step S3: The first mapping relationship is: ;in, The equivalent leakage flow rate is given by g, where g is the sealing gap and Δp is the pressure difference between the inside and outside of the motor. , , These are the model parameters determined through fitting via leakage tests; The second mapping relationship is: ;in, This refers to the amount of dust deposited. The ambient dust concentration is denoted as t, and the continuous operating time is t. This is the dust deposition correction factor; The dust deposition correction factor Based on dust characteristic particle size The relationship between the motor speed n and the speed n is established as follows: ;in, , These are the reference particle size and reference rotation speed, respectively. , The particle size influence coefficient and rotation speed influence coefficient are determined by fitting a dust environment simulation deposition experiment; The third mapping relationship is as follows: ,in, The equivalent thermal resistance after dust deposition. The initial equivalent thermal resistance under clean conditions. This is the coefficient representing the influence of dust deposition on the equivalent thermal resistance.

[0015] In one embodiment, the operating temperature of the critical area in step S4. The calculation formula is: ,in, For ambient temperature, This represents the total power loss of the motor.

[0016] In one embodiment, in step S5: The insulation life calculate: ,in, b These are the reference life, insulation life attenuation coefficient, and reference temperature, determined based on the thermal aging characteristics of the insulating material, respectively. The bearing life Calculated by multiplying the base lifetime by multiple correction factors: ,in, For the basic life of the bearing, This is the load correction factor. This is a temperature correction factor. This is the dust deposition correction factor.

[0017] In one embodiment, step S6, the parameter inverse design specifically includes: According to the preset lifespan requirement And using the insulation life model, the upper limit of the allowable temperature of the critical area is calculated inversely to meet the life requirements. : ; Based on the upper limit of the allowable temperature Ambient temperature Equivalent convective heat transfer coefficient and power loss Calculate the minimum required design heat dissipation area. : ; Using the sealing gap g as a design variable, the equivalent leakage flow rate under different g values ​​is calculated iteratively. Dust deposition amount Equivalent thermal resistance after degradation Operating temperature of critical areas and comprehensive life index until satisfaction is found ≥ And the heat dissipation area is not less than The design value of the sealing gap g.

[0018] Secondly, embodiments of the present invention provide a life-guiding parameter design device for a mining permanent magnet motor, comprising: The parameter acquisition module is used to acquire the operating parameters, structural parameters, mining dust environment parameters, and life preset parameters of the mining permanent magnet motor. The target criterion module is used to establish a lifespan constraint criterion based on the preset lifespan parameters. The deposition and thermal resistance modeling module establishes a first mapping relationship from the sealing gap to the equivalent leakage flow rate, and a second mapping relationship from the equivalent leakage flow rate, operating parameters, and mining dust environment parameters to the amount of dust deposition, based on the structural parameters and mining dust environment parameters; and establishes a third mapping relationship based on the amount of dust deposition that leads to the deterioration of the equivalent thermal resistance of the motor. The temperature rise calculation module calculates the operating temperature of the stator winding insulation region based on the deteriorated equivalent thermal resistance obtained from the third mapping relationship and the loss parameters in the operating parameters. The life assessment module calculates the stator winding insulation life and bearing life based on the operating temperature, the operating parameters and the amount of dust deposition, and uses the minimum of the two as a comprehensive life index to verify whether the life constraint criterion is met. The parameter inverse design module is used to solve the mapping and calculation relationships in the deposition and thermal resistance modeling module, temperature rise calculation module, and life assessment module simultaneously, using the life constraint criterion as the boundary condition, and inversely solve for the design value of the sealing gap and the design value of the heat dissipation area required to meet the life requirements. The result output module is used to output the parameter design results, including the design value of the sealing gap and the design value of the heat dissipation area.

[0019] Thirdly, embodiments of the present invention provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the method as described in any of the embodiments of the first aspect.

[0020] Fourthly, embodiments of the present invention provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method as described in any of the embodiments of the first aspect.

[0021] As can be seen from the above technical solutions, compared with the prior art, the present invention has the following technical advantages: This invention incorporates the impact of dust deposition in mining dust environments into the design process of permanent magnet motor life parameters. By establishing the correspondence between equivalent leakage flow, dust deposition amount, thermal resistance degradation, stator winding insulation area operating temperature, and comprehensive life indicators, it achieves quantitative transfer from dust environment parameters to life-oriented design parameters. This invention uses thermal resistance degradation as the core constraint factor in life parameter design, enabling the protection and heat dissipation parameters of mining permanent magnet motors to be determined by life target criteria. This invention can improve the rationality of life design and operational reliability of mining permanent magnet motors while meeting the adaptability requirements of mining dust environments. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 This is a flowchart of the life-guiding parameter design method for mining permanent magnet motors provided in this embodiment of the invention; Figure 2 This is a block diagram of the life guidance parameter design device for mining permanent magnet motors provided in this embodiment of the invention; Figure 3 This is a structural diagram of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1: In mining permanent magnet motors operating under high dust and long-term continuous operation conditions, external dust easily enters the motor through assembly gaps, connections, and ventilation paths, gradually accumulating in the stator ends, winding insulation areas, and heat dissipation channels. This dust accumulation weakens the motor's internal heat dissipation capacity, increases equivalent thermal resistance, leads to increased temperature rise in critical components, and causes a decrease in insulation life and a shortened bearing life. Addressing the problem of disconnected protection design, heat dissipation design, and lifespan analysis in existing technologies, this invention proposes a lifespan-oriented parameter design method for mining permanent magnet motors based on the constraint of dust accumulation and thermal resistance degradation. This method integrates mining dust environment parameters, motor operating parameters, protection structure parameters, and lifespan target criteria into a unified design process. By establishing a quantitative relationship between dust accumulation, thermal resistance degradation, stator winding insulation area operating temperature, and comprehensive lifespan indicators, it reverse-engineers the design of sealing gaps, equivalent leakage flow, and minimum heat dissipation area, thereby obtaining parameter design results that meet lifespan requirements.

[0026] Reference Figure 1 As shown, the design method for the life-guiding parameters of the mining permanent magnet motor includes: S1. Parameter acquisition steps: Acquire the operating parameters, structural parameters, mining dust environment parameters, and life preset parameters of the mining permanent magnet motor; S2. Target criterion step: Establish a lifespan constraint criterion based on the preset lifespan parameters; S3. Deposition and thermal resistance modeling steps: Based on the structural parameters and mining dust environment parameters, establish a first mapping relationship from the sealing gap to the equivalent leakage flow rate, and a second mapping relationship from the equivalent leakage flow rate, operating parameters, and mining dust environment parameters to the dust deposition amount; based on the dust deposition amount, establish a third mapping relationship that dust deposition leads to the deterioration of the motor's equivalent thermal resistance. S4. Temperature rise calculation steps: Based on the deteriorated equivalent thermal resistance obtained from the third mapping relationship and the loss parameters in the operating parameters, calculate the operating temperature of the stator winding insulation area. S5. Life assessment steps: Based on the operating temperature, the operating parameters and the amount of dust deposition, calculate the stator winding insulation life and bearing life respectively, and use the minimum of the two as the comprehensive life index to verify whether the life constraint criterion is met. S6. Parameter inverse design steps: Using the life constraint criterion as the boundary condition, solve the mapping and calculation relationships in S3, S4 and S5 simultaneously, and solve in reverse to obtain the design value of the sealing gap and the design value of the heat dissipation area required to meet the life requirements. S7. Result Output Step: Output the parameter design results, including the design value of the sealing gap and the design value of the heat dissipation area.

[0027] The method disclosed in this invention does not start from the heat dissipation structure, protection structure or cooling system alone, but incorporates dust deposition, thermal resistance degradation, stator winding insulation area temperature rise and life decay in the mining dust environment into the same parameter design process. By establishing the corresponding quantitative relationship, life-oriented constraint design is carried out on the protection parameters and heat dissipation parameters, thereby providing a new technical path for the life design of mining permanent magnet motors in dust environments.

[0028] The following is a detailed explanation of each of the above steps: Step 1: Obtain operating parameters and environmental parameters for mining dust.

[0029] Obtain the operating parameters, structural parameters, and environmental parameters of mining dust from the permanent magnet motor used in mining. Among them, the operating parameters include motor speed Rated torque of the motor Motor load torque Continuous running time Motor power loss Initial equivalent thermal resistance in a clean state and equivalent convective heat transfer coefficient ; Structural parameters include sealing gap ; Environmental parameters for mining dust include ambient temperature. Environmental dust mass concentration Dust characteristic particle size and the pressure difference between the inside and outside of the motor ; Lifespan preset parameters include: setting preset lifespan requirements. Bearing base life Reference life and reference temperature .

[0030] Step 2: Determining Lifespan Target Criteria. Based on the lifespan design requirements of mining permanent magnet motors, establish comprehensive lifespan constraint criteria and comprehensive lifespan indicators. satisfy

[0031] And define the life margin factor. for

[0032] Therefore, there is

[0033] in, This represents the overall lifespan index. Indicates the preset lifespan requirement. This represents the life margin coefficient.

[0034] Step 3: Establish the relationship between dust deposition characteristics and thermal resistance degradation.

[0035] Based on the environmental parameters of mining dust, motor operating parameters, and protective structure parameters, an equivalent leakage flow model, a dust deposition model, and a thermal resistance degradation model are established. Specifically: the first mapping relationship, the second mapping relationship, and the third mapping relationship are: First mapping relationship: Equivalent leakage flow Represented as:

[0036] Second mapping relationship: Dust deposition model Represented as

[0037] Among them, the dust deposition correction coefficient Represented as

[0038] The dust deposition correction factor is an empirical calibration model established based on dust environment simulation experiments and deposition quality measurement results.

[0039] The aforementioned dust environment simulation test was conducted using a closed-loop dust-laden circulating deposition test device. This device includes a test chamber, an air supply unit, a dust injection unit, a concentration adjustment unit, and a dust recovery unit. The test chamber houses a prototype motor or an equivalent prototype with a sealing structure and heat dissipation channels identical to the target motor. The air supply unit generates a stable dust-laden airflow, the dust injection unit controls the ambient dust concentration, the concentration adjustment unit regulates and maintains a set dust concentration level, and the dust recovery unit collects undeposited dust, thus creating a stable and repeatable dust-laden circulating environment. During the test, dust deposition data under different operating conditions were obtained by controlling the dust concentration, motor speed, and test duration.

[0040] The aforementioned deposition mass measurement was performed using a detachable deposition sampling plate weighing method. Detachable sampling plates with surface characteristics consistent with the target area were placed at the stator end, winding insulation area, and heat dissipation channel. Before the test, the sampling plates were cleaned, dried, and weighed initially. After the test, the sampling plates were removed, cleaned, dried again, and weighed again to determine the final mass. The difference between the two mass measurements represents the deposition dust mass of the corresponding area. For whole-machine verification, the motor can be further disassembled, and the deposition dust in the target area can be collected and weighed to verify the sampling plate measurement results.

[0041] Among them, the particle size influence coefficient and speed influence coefficient The calibration was obtained by controlling variables at a fixed reference speed. Changing the characteristic particle size of dust under different conditions The results were obtained by fitting the sedimentation quality measurement results. ; at a fixed reference particle size Changing motor speed under certain conditions The results were obtained by fitting the sedimentation quality measurement results. .

[0042] Third mapping relationship: Equivalent thermal resistance after dust deposition Represented as

[0043] in, Indicates the equivalent leakage flow rate. This represents the leakage ratio coefficient. Indicates the gap index, Indicates the differential pressure index. The ambient dust concentration is denoted as t, and the continuous operating time is t. This represents the dust deposition correction factor. Indicates the particle size influence coefficient. Indicates the influence coefficient of rotational speed. Indicates the reference particle size. Indicates the reference speed. Indicates the amount of dust deposited. This represents the equivalent thermal resistance after dust deposition. This represents the coefficient of thermal resistance influence of dust deposition.

[0044] in, , and These represent the leakage proportionality coefficient, gap index, and differential pressure index in the equivalent leakage flow model, respectively, and are used to characterize the influence of sealing gap and internal and external pressure difference of the motor on leakage flow. The parameters are obtained through leakage tests and data fitting under different sealing gaps and different differential pressure conditions. Specifically, a differential pressure test bench is used to test physical samples or structurally equivalent samples with the same structure as the sealing part of the target motor. During the test, different sealing gaps are used. and different pressure differences Measure the corresponding leakage flow rate under the conditions In each set of tests, the sample structure, medium type, and ambient temperature were kept constant; only the sealing gap and pressure difference were changed, and steady-state leakage flow data were recorded. Then, a power function model was used.

[0045] As a fitting method, least squares fitting is performed on the experimental data to obtain the leakage proportionality coefficient. Gap index and differential pressure index The value of .

[0046] and These represent the influence coefficients of dust characteristic particle size and motor speed on the dust deposition correction coefficient, respectively. and These represent the reference particle size and reference rotation speed, respectively. These parameters were obtained through dust environment simulation experiments, deposition quality measurements, and fitting calibration. The coefficient representing the influence of dust deposition on the equivalent thermal resistance is obtained through thermal balance experiments or thermal network simulation fitting under different deposition conditions.

[0047] Step 4: Determining the temperature rise parameters of the stator winding insulation area. Based on the thermal resistance degradation results and motor loss parameters, determine the temperature rise parameters and operating temperature parameters of the stator winding insulation area. for

[0048] Stator winding insulation area operating temperature for

[0049] in, This indicates the temperature rise in the insulation area of ​​the stator winding. This indicates the operating temperature of the insulated area of ​​the stator winding.

[0050] Step 5: Establishment of the life decay model. A life decay model is established based on the operating temperature of the stator winding insulation region, using insulation life as the primary life index and bearing life as an auxiliary life index. In the implementation of this invention, the load torque... At rated torque Values ​​can be taken within the allowed range.

[0051] Insulation life model for

[0052] Load correction factor Represented as

[0053] Temperature correction factor Represented as

[0054] Dust correction factor Represented as

[0055] Bearing life correction model for

[0056] Comprehensive life index for

[0057] in, Indicates insulation life, Indicates reference lifespan. Indicates the insulation life attenuation coefficient. Indicates reference temperature. Indicates the load correction factor. This represents the temperature correction factor. Indicates the temperature effect coefficient. This represents the dust correction factor. Indicates the dust lifespan impact coefficient. Indicates the modified life of the bearing. Indicates the basic life of the bearing. This indicates the overall lifespan index.

[0058] , and These represent the reference lifetime, insulation lifetime decay coefficient, and reference temperature in the insulation lifetime model, respectively. Reference temperature Determined based on the allowable operating temperature of the insulation class used in the motor; reference life. For the corresponding reference temperature The baseline value for insulation life can be obtained from insulation material manuals, insulation class standard values, or life design manuals for similar motors. Insulation life attenuation coefficient The calibration is obtained through insulation thermal aging tests. Specifically, under several constant temperature conditions above a reference temperature, accelerated thermal aging tests are conducted on winding insulation samples or insulation material specimens. The lifetime data corresponding to the point where the insulation performance deteriorates to the failure criterion is recorded. Then, the lifetime is fitted based on the exponential relationship between temperature to obtain the calibration result. The value of .

[0059] and These represent the temperature influence coefficient and the dust lifetime influence coefficient, respectively, used to characterize the impact of temperature and dust deposition on bearing life correction. The lifespan is determined through bearing temperature rise life tests or temperature life correction curves provided by the bearing manufacturer. Specifically, this involves operating the same type of bearing under different stable operating temperature conditions, recording the lifespan variation, and fitting a temperature correction coefficient model to obtain the desired result. The possible values ​​of ; The bearing life is determined through bearing life tests or pollution correction curves in dusty environments. Specifically, the same type of bearing is operated under different dust deposition amounts or pollution levels, the life decay pattern is recorded, and a dust correction coefficient model is fitted to obtain... The value of .

[0060] When measured data is lacking and Initial values ​​can also be obtained from historical test data or manufacturer correction curves of bearings used in similar mining permanent magnet motors, and then corrected after prototype testing.

[0061] Step 6: Design of Protection and Heat Dissipation Parameters. Based on the lifespan target criteria, dust deposition characteristics, and thermal resistance degradation relationship, the protection and heat dissipation parameters of the permanent magnet motor are designed with constraints. The upper limit of the allowable temperature of the stator winding insulation region is calculated by inversely using the insulation lifespan model to meet the preset lifespan requirements. Its expression is

[0062] Based on the upper limit of the allowable temperature Ambient temperature Equivalent convective heat transfer coefficient and motor power loss Calculate the minimum heat dissipation area required to meet the lifespan requirements. Its expression is

[0063] Lifetime constraints are

[0064] and

[0065] During the parameter design process, the sealing gap will be considered. As a design variable, the upper limit of the allowable heat dissipation area of ​​the structure is given in advance. and for different candidates The corresponding equivalent leakage flow rate is calculated sequentially. Dust deposition amount Equivalent thermal resistance after degradation Operating temperature of stator winding insulation area Insulation life Bearing life and comprehensive life index When a candidate The value satisfies: And the corresponding minimum heat dissipation area satisfies: At that time, the candidate Recorded as the feasible design value; if This indicates that the current heat dissipation solution is not feasible under the constraints of structural space, and it is necessary to improve the equivalent convective heat transfer coefficient. Alternatively, the available heat dissipation area of ​​the structure can be increased and the design iteratively repeated. The final output should be a sealing gap design value that satisfies both lifespan and heat dissipation space constraints. and minimum heat dissipation area design value .in, This indicates the upper limit of the allowable temperature of the stator winding insulation area when the preset lifespan requirement is met. This indicates the minimum heat dissipation area required to meet lifespan requirements. This indicates the upper limit of the allowable heat dissipation area of ​​the structure. It represents the equivalent convective heat transfer coefficient.

[0066] Step 7: Comprehensive Judgment and Parameter Output. Based on the lifespan target criteria, dust deposition characteristics, thermal resistance degradation results, and stator winding insulation temperature rise parameters, output the design parameters of the mining permanent magnet motor that meet the lifespan requirements. These design parameters include the sealing gap. Equivalent leakage flow Minimum heat dissipation area Insulation life Bearing life Comprehensive life index and life margin factor .

[0067] To more clearly illustrate the method of obtaining model parameters and the lifetime-oriented parameter design process in this invention, the following provides examples of parameter calibration, design verification mode, and parameter inverse design mode, and further describes the implementation methods of the corresponding device, electronic device, and storage medium.

[0068] Example 1: Parameter label: This embodiment illustrates the process of obtaining and calibrating leakage model parameters, dust deposition correction coefficient model parameters, thermal resistance influence coefficient, and lifetime correction parameters.

[0069] (1) Leakage model parameter calibration. A differential pressure test bench was used to test physical samples or structurally equivalent samples with the same structure as the sealing part of the target motor, at different sealing gaps. and different pressure differences Measure the corresponding leakage flow rate under the conditions .by

[0070] To fit the model, least squares fitting was performed on the experimental data to obtain the leakage ratio coefficient. Gap index and differential pressure index The value of .

[0071] (2) Calibration of dust deposition correction coefficient model parameters. A closed-loop dust-containing circulating deposition test device was used to run the motor prototype or structural equivalent sample under constant dust mass concentration conditions. Removable deposition sampling plates were placed at the stator end, winding insulation area, and heat dissipation channel. The initial mass of the sampling plates was weighed before the test, and the final mass was weighed after the test. The mass difference was taken as the mass of deposited dust. A reference particle size was set. and reference speed ,by

[0072] To fit the model, the characteristic particle size of the dust was varied under a fixed rotation speed. The grain size influence coefficient was obtained by fitting the sedimentation quality measurement results. ; Changing the motor speed under the condition of fixed dust characteristic particle size The rotation speed influence coefficient was obtained by fitting the sedimentation quality measurement results. .

[0073] (3) Calibration of thermal resistance influence coefficient. Thermal balance tests were conducted under different dust deposition mass conditions to measure the steady-state temperature rise of the motor, and the equivalent thermal resistance was calculated using a thermal network model. The thermal resistance increment was then fitted with the dust deposition mass to obtain the influence coefficient of dust deposition on the equivalent thermal resistance. .

[0074] (4) Calibration of life correction parameters. Reference life Insulation life attenuation coefficient and reference temperature Determined based on parameters in insulation material handbooks, insulation class standard values, or results of thermal aging tests; temperature influence coefficient. Determined through bearing temperature rise life test or temperature correction curve provided by bearing manufacturer; dust life influence coefficient. Determined by fitting bearing life test data, contamination correction curve data, or historical test data of similar products under dusty conditions.

[0075] Through the above parameter calibration process, the model coefficients required for subsequent life-guided parameter design calculations can be obtained, providing a basis for design verification and parameter reverse calculation.

[0076] Example 2: Design verification pattern: The following is an example of the design of a 5kW rated power mining internal rotor permanent magnet motor.

[0077] The motor is designed to operate in a dusty mining environment, and its operating parameters and environmental parameters are as follows: Motor mechanical speed. Rated torque Load torque Continuous running time Total power loss of motor Initial equivalent thermal resistance in a clean state Equivalent convective heat transfer coefficient Sealing gap Ambient temperature Environmental dust mass concentration Dust characteristic particle size Pressure difference between inside and outside the motor Preset lifespan requirements Bearing base life Reference life Reference temperature .

[0078] Objective: To verify the life compliance of a motor whose initial design has been completed (in this embodiment, the sealing gap g = 0.15 mm is taken as a known input).

[0079] process: Step 1: Obtaining operating parameters and mining dust environment parameters. According to the settings of this embodiment, the motor operating parameters have been obtained. , , , , , and Structural parameters and environmental parameters of mining dust , , and And set preset lifespan requirements. Bearing base life Reference life and reference temperature .

[0080] Step 2: Life Target Criteria Determination. Based on life design requirements, establish comprehensive life constraint criteria, requiring comprehensive life indicators... satisfy

[0081] And define the life margin factor. for

[0082] Therefore, there is

[0083] In this embodiment, the preset lifespan requirement is: .

[0084] Step 3: Establish the relationship between dust deposition characteristics and thermal resistance degradation. Take the leakage proportionality coefficient. Gap index Pressure differential index Particle size influence coefficient Rotational speed influence coefficient Reference particle size Reference speed Dust deposition thermal resistance influence coefficient Based on the equivalent leakage flow model

[0085] achievable

[0086] Based on the dust deposition correction coefficient model

[0087] achievable

[0088] Based on the dust deposition model

[0089] And convert the continuous running time to seconds, that is , can be obtained

[0090] Based on the thermal resistance degradation model

[0091] achievable

[0092] Step 4: Determine the temperature rise parameters of the stator winding insulation area. Based on the thermal resistance degradation results and motor loss parameters, determine the temperature rise parameters of the stator winding insulation area. for

[0093] Substitution and ,have to

[0094] Stator winding insulation area operating temperature for

[0095] Substitution ,have to

[0096] Step 5: Establish the lifetime degradation model. Calculate the insulation lifetime degradation coefficient. Temperature influence coefficient Dust lifespan impact coefficient According to the insulation life model

[0097] achievable

[0098] Based on the load correction coefficient model

[0099] achievable

[0100] Based on the temperature correction coefficient model

[0101] achievable

[0102] Based on the dust correction coefficient model

[0103] achievable

[0104] Based on the bearing life correction model

[0105] achievable

[0106] According to the comprehensive life index model

[0107] achievable

[0108] Step 6: Design of protection and heat dissipation parameters. Based on the insulation life model, calculate the upper limit of the allowable temperature in the stator winding insulation region to meet the life requirements. :

[0109] Substitution , , , , can be obtained

[0110] Based on the minimum heat dissipation area model

[0111] Substitution , , , , can be obtained

[0112] According to the lifetime constraint criterion, we have

[0113] The life margin factor is

[0114] It is evident that the satisfaction

[0115] Therefore, in this embodiment, when the sealing gap is taken as Equivalent leakage flow rate The minimum heat dissipation area is not less than At that time, the lifespan target constraint can be met.

[0116] Step 7: Comprehensive Judgment and Parameter Output. Based on the above calculation results, the design parameters of the mining permanent magnet motor that meet the life requirements are output as follows: sealing gap. Equivalent leakage flow Minimum heat dissipation area Insulation life bearing life Comprehensive life index Life margin factor Therefore, it can be seen that the protection parameters and heat dissipation parameters determined in this embodiment can meet the life design requirements in a mining dust environment.

[0117] Example 3: Inverse parameter design pattern: Objective: To determine the design values ​​of sealing gap g and heat dissipation area A during the conceptual design phase of the motor, guided by life targets.

[0118] This embodiment is used to illustrate the situation where the sealing gap is unknown. In such cases, how can we reverse-engineer the design values ​​of the sealing gap and the minimum heat dissipation area to meet the constraints, guided by the lifespan target?

[0119] Set the motor speed Rated torque Load torque Continuous running time Total power loss of motor Initial equivalent thermal resistance in a clean state Equivalent convective heat transfer coefficient Ambient temperature Environmental dust mass concentration Dust characteristic particle size Pressure difference between inside and outside the motor Preset lifespan requirements Bearing base life Reference life Reference temperature The maximum allowable heat dissipation area of ​​the structure is set to...

[0120] The upper limit of the allowable temperature of the stator winding insulation region when the life requirement is met is calculated by inversely using the insulation life model:

[0121] Further, the minimum heat dissipation area design value is obtained:

[0122] because

[0123] This indicates that the current heat dissipation solution meets the structural space constraints, and the sealing gap can be further improved. Perform reverse engineering.

[0124] seal gap As a design variable, the candidate range is set as follows: to Step size is For each candidate The values ​​are then used to calculate the corresponding equivalent leakage flow rates. Dust deposition amount Equivalent thermal resistance after degradation Operating temperature of stator winding insulation area Insulation life Bearing life and comprehensive life index .

[0125] Through iterative comparison, it can be seen that when At that time, the leakage flow rate was small, but the manufacturing and assembly margins were too small; when At that time, the comprehensive life index meets

[0126] And the life margin coefficient satisfies

[0127] At the same time, the corresponding minimum heat dissipation area satisfies the structural space constraints, therefore it can be Determined as a feasible design value; when As the leakage rate continues to increase, the leakage flow and dust deposition increase, leading to an increase in equivalent thermal resistance and operating temperature, resulting in a decrease in overall life indicators and making it difficult to meet life targets.

[0128] Therefore, in this embodiment, the design value of the sealing gap is determined. The corresponding minimum heat dissipation area design value is

[0129] This demonstrates that, under the combined influence of lifespan targets and structural space constraints, the required design values ​​for sealing gaps and heat dissipation areas can be obtained through iterative methods.

[0130] This invention discloses a life-oriented parameter design method for mining permanent magnet motors based on dust deposition and thermal resistance degradation constraints. The method first obtains the operating parameters, structural parameters, and environmental parameters of the mining permanent magnet motor, and determines the life-oriented target criteria. Then, it establishes an equivalent leakage flow model, a dust deposition model, and a thermal resistance degradation model, calculating the temperature rise parameters and operating temperature parameters of the stator winding insulation region based on the thermal resistance changes caused by dust deposition. Further, it establishes a life-degradation model with insulation life as the primary factor and bearing life as a secondary factor, obtaining a comprehensive life-oriented index. Finally, based on the life-oriented target criteria, it designs constraints on sealing gaps, equivalent leakage flow, and minimum heat dissipation area, and outputs the parameter design results of the mining permanent magnet motor that meet the life-oriented requirements. This invention can transform the impact of dust deposition in the mining dust environment into thermal resistance degradation constraints and life-oriented constraints, providing a basis for life-oriented design of protection and heat dissipation parameters for mining permanent magnet motors, and improving the operational reliability and life-oriented design rationality of mining permanent magnet motors in dusty environments.

[0131] Example 2: This invention provides a device for designing life-guiding parameters for mining permanent magnet motors, referring to... Figure 2 As shown, it includes: The parameter acquisition module is used to acquire the operating parameters, structural parameters, mining dust environment parameters, and life preset parameters of the mining permanent magnet motor. The target criterion module is used to establish a lifespan constraint criterion based on the preset lifespan parameters. The deposition and thermal resistance modeling module establishes a first mapping relationship from the sealing gap to the equivalent leakage flow rate, and a second mapping relationship from the equivalent leakage flow rate, operating parameters, and mining dust environment parameters to the amount of dust deposition, based on the structural parameters and mining dust environment parameters; and establishes a third mapping relationship based on the amount of dust deposition that leads to the deterioration of the equivalent thermal resistance of the motor. The temperature rise calculation module calculates the operating temperature of the stator winding insulation region based on the deteriorated equivalent thermal resistance obtained from the third mapping relationship and the loss parameters in the operating parameters. The life assessment module calculates the stator winding insulation life and bearing life based on the operating temperature, the operating parameters and the amount of dust deposition, and uses the minimum of the two as a comprehensive life index to verify whether the life constraint criterion is met. The parameter inverse design module is used to solve the mapping and calculation relationships in the deposition and thermal resistance modeling module, temperature rise calculation module, and life assessment module simultaneously, using the life constraint criterion as the boundary condition, and inversely solve for the design value of the sealing gap and the design value of the heat dissipation area required to meet the life requirements. The result output module is used to output the parameter design results, including the design value of the sealing gap and the design value of the heat dissipation area.

[0132] This device solidifies the steps and flow of the method in Embodiment 1 through the coordinated operation of its various functional modules. Since the principle underlying the problem solved by these devices is similar to the aforementioned design of life-guiding parameters for a mining permanent magnet motor, the implementation of this device can refer to the implementation of the aforementioned method; repeated details will not be elaborated further.

[0133] Example 3: This invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the steps of a life-guiding parameter design method for a mining permanent magnet motor as described in Embodiment 1 above.

[0134] Reference Figure 3 As shown, the electronic device may include: a processor 10, a communication interface 20, a memory 30, and a communication bus 40, wherein the processor 10, the communication interface 20, and the memory 30 communicate with each other via the communication bus 40. The processor 10 can call logic instructions in the memory 30 to execute a life-guiding parameter design method for a mining permanent magnet motor, the method including: S1. Parameter acquisition steps: Acquire the operating parameters, structural parameters, mining dust environment parameters, and life preset parameters of the mining permanent magnet motor; S2. Target criterion step: Establish a lifespan constraint criterion based on the preset lifespan parameters; S3. Deposition and thermal resistance modeling steps: Based on the structural parameters and mining dust environment parameters, establish a first mapping relationship from the sealing gap to the equivalent leakage flow rate, and a second mapping relationship from the equivalent leakage flow rate, operating parameters, and mining dust environment parameters to the dust deposition amount; based on the dust deposition amount, establish a third mapping relationship that dust deposition leads to the deterioration of the motor's equivalent thermal resistance. S4. Temperature rise calculation steps: Based on the deteriorated equivalent thermal resistance obtained from the third mapping relationship and the loss parameters in the operating parameters, calculate the operating temperature of the stator winding insulation area. S5. Life assessment steps: Based on the operating temperature, the operating parameters and the amount of dust deposition, calculate the stator winding insulation life and bearing life respectively, and use the minimum of the two as the comprehensive life index to verify whether the life constraint criterion is met. S6. Parameter inverse design steps: Using the life constraint criterion as the boundary condition, solve the mapping and calculation relationships in S3, S4 and S5 simultaneously, and solve in reverse to obtain the design value of the sealing gap and the design value of the heat dissipation area required to meet the life requirements. S7. Result Output Step: Output the parameter design results, including the design value of the sealing gap and the design value of the heat dissipation area.

[0135] Example 4: This invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements a life-guiding parameter design method for a mining permanent magnet motor as described in Embodiment 1 above. The program can be executed on a processor.

[0136] Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory, random access memory, magnetic disks, or optical disks.

[0137] The program stored on this medium is loaded into the processor's memory and executed to perform various functions. This storage medium, connected to hardware devices, enables the computer to execute the steps of Embodiment 1 described above.

[0138] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0139] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for designing life-guiding parameters for a mining permanent magnet motor, characterized in that, include: S1. Parameter acquisition steps: Acquire the operating parameters, structural parameters, mining dust environment parameters, and life preset parameters of the mining permanent magnet motor; S2. Target criterion step: Establish a lifespan constraint criterion based on the preset lifespan parameters; S3. Deposition and thermal resistance modeling steps: Based on the structural parameters and mining dust environment parameters, establish a first mapping relationship from the sealing gap to the equivalent leakage flow rate, and a second mapping relationship from the equivalent leakage flow rate, operating parameters and mining dust environment parameters to the dust deposition amount; Based on the amount of dust deposition, a third mapping relationship is established to show that dust deposition leads to the deterioration of the equivalent thermal resistance of the motor. S4. Temperature rise calculation steps: Based on the deteriorated equivalent thermal resistance obtained from the third mapping relationship and the loss parameters in the operating parameters, calculate the operating temperature of the stator winding insulation area. S5. Life assessment steps: Based on the operating temperature, the operating parameters and the amount of dust deposition, calculate the stator winding insulation life and bearing life respectively, and use the minimum of the two as the comprehensive life index to verify whether the life constraint criterion is met. S6. Parameter inverse design steps: Using the life constraint criterion as the boundary condition, solve the mapping and calculation relationships in S3, S4 and S5 simultaneously, and solve in reverse to obtain the design value of the sealing gap and the design value of the heat dissipation area required to meet the life requirements. S7. Result Output Step: Output the parameter design results, including the design value of the sealing gap and the design value of the heat dissipation area.

2. The method according to claim 1, characterized in that, In step S1: Operating parameters include motor speed Rated torque Load torque Continuous running time Motor power loss Initial equivalent thermal resistance in a clean state and equivalent convective heat transfer coefficient ; Structural parameters include sealing gap ; Environmental parameters for mining dust include ambient temperature. Environmental dust mass concentration Dust characteristic particle size and the pressure difference between the inside and outside of the motor ; Lifespan preset parameters include: setting preset lifespan requirements. Bearing base life Reference life and reference temperature .

3. The method according to claim 2, characterized in that, Step S2 specifically includes: Based on the life design requirements of permanent magnet motors for mining, a comprehensive life constraint criterion and a comprehensive life index are established. satisfy: And define the life margin factor. for: Based on this, there is in, This represents the overall lifespan index. Indicates the preset lifespan requirement. This represents the life margin coefficient.

4. The method according to claim 3, characterized in that, In step S3: The first mapping relationship is: ;in, The equivalent leakage flow rate is given by g, where g is the sealing gap and Δp is the pressure difference between the inside and outside of the motor. , , These are the model parameters determined through fitting via leakage tests; The second mapping relationship is: ;in, This refers to the amount of dust deposited. The ambient dust concentration is denoted as t, and the continuous operating time is t. This is the dust deposition correction factor; The dust deposition correction factor Based on dust characteristic particle size The relationship between the motor speed n and the speed n is established as follows: ;in, , These are the reference particle size and reference rotation speed, respectively. , The particle size influence coefficient and rotation speed influence coefficient are determined by fitting a dust environment simulation deposition experiment; The third mapping relationship is as follows: ,in, The equivalent thermal resistance after dust deposition. The initial equivalent thermal resistance under clean conditions. This is the coefficient representing the influence of dust deposition on the equivalent thermal resistance.

5. The method according to claim 4, characterized in that, In step S4, the operating temperature of the key area The calculation formula is: ,in, For ambient temperature, This represents the total power loss of the motor.

6. The method according to claim 5, characterized in that, In step S5: The insulation life calculate: ,in, b These are the reference life, insulation life attenuation coefficient, and reference temperature, determined based on the thermal aging characteristics of the insulating material, respectively. The bearing life Calculated by multiplying the base lifetime by multiple correction factors: ,in, For the basic life of the bearing, This is the load correction factor. This is the temperature correction factor. This is the dust deposition correction factor.

7. The method according to claim 6, characterized in that, In step S6, the parameter inverse design specifically includes: According to the preset lifespan requirement And using the insulation life model, the upper limit of the allowable temperature of the critical area is calculated inversely to meet the life requirements. : ; Based on the upper limit of the allowable temperature Ambient temperature Equivalent convective heat transfer coefficient and power loss Calculate the minimum required design heat dissipation area. : ; Using the sealing gap g as a design variable, the equivalent leakage flow rate under different g values ​​is calculated iteratively. Dust deposition amount Equivalent thermal resistance after degradation Operating temperature of critical areas and comprehensive life index until satisfaction is found ≥ And the heat dissipation area is not less than The design value of the sealing gap g.

8. A device for designing life-guiding parameters for a mining permanent magnet motor, characterized in that, include: The parameter acquisition module is used to acquire the operating parameters, structural parameters, mining dust environment parameters, and life preset parameters of the mining permanent magnet motor. The target criterion module is used to establish a lifespan constraint criterion based on the preset lifespan parameters. The deposition and thermal resistance modeling module establishes a first mapping relationship from the sealing gap to the equivalent leakage flow rate, and a second mapping relationship from the equivalent leakage flow rate, operating parameters, and mining dust environment parameters to the amount of dust deposition, based on the structural parameters and mining dust environment parameters; and establishes a third mapping relationship based on the amount of dust deposition that leads to the deterioration of the equivalent thermal resistance of the motor. The temperature rise calculation module calculates the operating temperature of the stator winding insulation region based on the deteriorated equivalent thermal resistance obtained from the third mapping relationship and the loss parameters in the operating parameters. The life assessment module calculates the stator winding insulation life and bearing life based on the operating temperature, the operating parameters and the amount of dust deposition, and uses the minimum of the two as a comprehensive life index to verify whether the life constraint criterion is met. The parameter inverse design module is used to solve the mapping and calculation relationships in the deposition and thermal resistance modeling module, temperature rise calculation module, and life assessment module simultaneously, using the life constraint criterion as the boundary condition, and inversely solve for the design value of the sealing gap and the design value of the heat dissipation area required to meet the life requirements. The result output module is used to output the parameter design results, including the design value of the sealing gap and the design value of the heat dissipation area.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the method as described in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the method as described in any one of claims 1 to 7.

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