Methods and systems for calculating protection and heat dissipation parameters of permanent magnet motors in dusty environments

Abstract

This invention discloses a method and system for calculating the protection and heat dissipation parameters of a permanent magnet motor in a dusty environment. The method includes the following steps: obtaining the dust mass concentration, dust particle size range, operating time, speed, and ventilation flow rate corresponding to the ventilation structure of the permanent magnet motor in its operating environment; calculating the minimum heat dissipation area of ​​the permanent magnet motor based on the obtained data and a preset maximum temperature rise threshold; and calculating the corresponding protection parameters of the permanent magnet motor based on the dust mass concentration, operating time, and preset maximum dust intrusion threshold. The protection parameters include the sealing gap size of the protection structure and the protection level. This invention, by obtaining dust environment parameters and motor operating parameters, collaboratively determines the protection structure parameters and heat dissipation structure parameters under both protection and temperature rise constraints, thereby achieving unified optimization of the protection and heat dissipation performance of the permanent magnet motor in a dusty environment.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet motor protection and reliability design technology, and more specifically to a method and system for calculating the protection and heat dissipation parameters of permanent magnet motors for dusty environments. Background Technology

[0002] Permanent magnet motors, due to their high efficiency, high power density, and excellent control performance, are widely used in industrial automation, machining, and harsh environment applications. However, in environments with high dust content, dust particles can easily penetrate the motor through the shaft extension, end cover gaps, and heat dissipation channels, adhering to the windings, permanent magnets, and bearing surfaces, affecting the motor's operational reliability and lifespan. To prevent dust particles from entering the motor, protective structures are typically installed at the shaft extension, end cover connection, and heat dissipation channels. However, permanent magnet motors themselves generate significant heat loss during operation, especially under high power density and long-term continuous operation conditions, placing high demands on heat dissipation performance. The introduction of protective structures inevitably alters the motor's original heat dissipation path and airflow conditions, making it difficult for internal heat to dissipate in a timely manner, thus exacerbating the temperature rise problem. Therefore, in dusty environments, permanent magnet motors generally face a contradiction between protection requirements and heat dissipation performance.

[0003] To address the protection and heat dissipation issues of permanent magnet motors in dusty environments, several existing technologies have improved these aspects through structural optimization. However, due to the inherent mutual constraint between protective and heat dissipation structures, structural optimization alone is insufficient to simultaneously meet both protection and heat dissipation requirements in dusty environments. Furthermore, changes in the parameters of the protective structure cannot be effectively assessed for their impact on heat dissipation performance during the design phase.

[0004] Therefore, proposing a method that can coordinate the configuration and design of protection parameters and heat dissipation parameters is the key to improving the reliability of permanent magnet motors in dusty environments, and is also a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of the above problems, the present invention is proposed to provide a method and system for calculating protection and heat dissipation parameters of permanent magnet motors in dusty environments, which overcomes or at least partially solves the above problems. By obtaining the dust mass concentration, particle size characteristics, and motor ventilation and operation parameters in the motor operating environment, the intrusion amount and deposition mass of dust into the motor are calculated. The influence of dust deposition on the equivalent thermal resistance and temperature rise of the motor is introduced into the heat dissipation parameter calculation process. Under the dual conditions of protection constraints and temperature rise constraints, the protection structure parameters and heat dissipation structure parameters are determined collaboratively.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, embodiments of the present invention provide a method for calculating protection and heat dissipation parameters of permanent magnet motors in dusty environments, comprising the following steps:

[0008] S1. Obtain the dust mass concentration and dust particle size range in the operating environment of the permanent magnet motor, as well as the operating time, speed and ventilation flow rate of the permanent magnet motor and the ventilation structure.

[0009] S2. Calculate the minimum heat dissipation area of ​​the permanent magnet motor based on the acquired data and the preset maximum temperature rise threshold of the motor; and calculate the corresponding protection parameters of the permanent magnet motor based on the dust mass concentration, the running time of the permanent magnet motor, and the preset maximum dust intrusion threshold; wherein, the protection parameters include: the sealing gap size of the protection structure and the protection level.

[0010] Furthermore, in step S2, the calculation of the minimum heat dissipation area of ​​the permanent magnet motor based on the acquired data and a preset maximum temperature rise threshold for the motor specifically includes:

[0011] S21. Calculate the mass of dust deposited by the permanent magnet motor during its operating time, expressed by the formula:

[0012]

[0013] in, For the quality of dust accumulation inside the permanent magnet motor, The mass concentration of dust in the environment. This refers to the ventilation flow rate corresponding to the ventilation structure of the permanent magnet motor. This is the dust collection efficiency coefficient. This refers to the running time of the permanent magnet motor;

[0014] S22. Based on the dust deposition mass inside the permanent magnet motor and the original equivalent thermal resistance of the permanent magnet motor in a dust-free environment, calculate the equivalent thermal resistance of the permanent magnet motor in a dusty environment, expressed by the formula:

[0015]

[0016] in, The equivalent thermal resistance of the motor in a dusty environment. The original equivalent thermal resistance of the permanent magnet motor in a dust-free environment. This is the correction factor for the effect of dust on thermal resistance;

[0017] S23. Based on the power loss of the permanent magnet motor and the equivalent thermal resistance of the motor in the dusty environment, calculate the steady-state temperature rise of the permanent magnet motor, and based on the preset maximum temperature rise threshold of the motor, calculate the minimum heat dissipation area required for the heat dissipation structure of the permanent magnet motor; the minimum heat dissipation area is expressed by the formula:

[0018]

[0019] in, To minimize heat dissipation area, For power loss in permanent magnet motors, The convective heat transfer coefficient is... The preset maximum temperature rise threshold for the motor. This refers to the steady-state temperature rise of the permanent magnet motor.

[0020] Furthermore, in step S21, the dust collection efficiency coefficient is obtained based on the dust particle size range and the operating time, speed and ventilation structure of the permanent magnet motor.

[0021] Furthermore, in step S22, the original equivalent thermal resistance of the permanent magnet motor in the dust-free environment is obtained based on the structure and loss of the permanent magnet motor under dust-free conditions, and is used to characterize the basic heat dissipation capability of the permanent magnet motor.

[0022] Furthermore, in step S23, the steady-state temperature rise of the permanent magnet motor is expressed by the formula:

[0023]

[0024] When satisfied Then, the minimum heat dissipation area required by the permanent magnet motor heat dissipation structure is calculated. Further, in step S2, based on the dust mass concentration, the operating time of the permanent magnet motor, and a preset maximum dust intrusion threshold, the corresponding protection parameters of the permanent magnet motor are calculated; specifically including:

[0025] Based on the dust mass concentration and the operating time of the permanent magnet motor, the dust intrusion mass that enters the permanent magnet motor through the protective structure is calculated, and expressed by the formula:

[0026]

[0027] in, The quality of dust entering the permanent magnet motor. To protect the equivalent leakage flow rate corresponding to the structure, To protect the structural sealing gap size, For protection level parameters;

[0028] Based on the preset maximum dust intrusion threshold The corresponding protection parameters of the permanent magnet motor are calculated and expressed by the following formula:

[0029]

[0030]

[0031] in, In order to match the geometric form of the protective structure and the parameters of the protection level The proportional coefficients related to differential pressure conditions and installation status. Leakage index for protective structural sealing gaps.

[0032] Secondly, embodiments of the present invention provide a permanent magnet motor protection and heat dissipation parameter calculation system for dusty environments, including:

[0033] Acquisition module: used to acquire the dust mass concentration, dust particle size range, operating time, speed, and ventilation flow rate corresponding to the ventilation structure of the permanent magnet motor in the operating environment;

[0034] The calculation module is used to calculate the minimum heat dissipation area of ​​the permanent magnet motor based on the acquired data and the preset maximum temperature rise threshold of the motor; and to calculate the corresponding protection parameters of the permanent magnet motor based on the dust mass concentration, the running time of the permanent magnet motor, and the preset maximum dust intrusion threshold; wherein, the protection parameters include: the sealing gap size of the protective structure and the protection level.

[0035] As can be seen from the above technical solutions, compared with the prior art, the present invention discloses a method and system for calculating the protection and heat dissipation parameters of permanent magnet motors for dusty environments. Compared with the existing design schemes that mainly rely on experience or single structural improvements, the present invention establishes a collaborative design method that combines dust protection constraints and temperature rise constraints by quantitatively calculating the dust environment parameters, motor ventilation parameters, protection structure parameters and heat dissipation structure parameters, thereby achieving unified optimization of protection performance and heat dissipation performance.

[0036] This invention incorporates the impact of dust deposition on motor heat dissipation performance into the parameter design process, clarifying the calculation basis and constraints for protective and heat dissipation structure parameters. While meeting dust protection requirements, it effectively controls motor temperature rise, reduces the risk of heat dissipation performance degradation in dusty environments, and significantly improves the operational reliability and environmental adaptability of permanent magnet motors. Furthermore, the method of this invention has good engineering feasibility and versatility, applicable to permanent magnet motors of different structural forms and power levels, and possesses high engineering application value. Attached Figure Description

[0037] 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.

[0038] Figure 1 This is a flowchart of a method for calculating protection and heat dissipation parameters of a permanent magnet motor in a dusty environment, provided in an embodiment of the present invention.

[0039] Figure 2 This is a structural diagram of a permanent magnet motor protection and heat dissipation parameter calculation system for dusty environments provided in an embodiment of the present invention. Detailed Implementation

[0040] 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.

[0041] This invention discloses a method for calculating the protection and heat dissipation parameters of permanent magnet motors in dusty environments, referring to... Figure 1 As shown, it includes the following steps:

[0042] S1. Obtain the dust mass concentration and dust particle size range in the operating environment of the permanent magnet motor, as well as the operating time, speed and ventilation flow rate of the permanent magnet motor and the ventilation structure.

[0043] S2. Calculate the minimum heat dissipation area of ​​the permanent magnet motor based on the acquired data and the preset maximum temperature rise threshold of the motor; and calculate the corresponding protection parameters of the permanent magnet motor based on the dust mass concentration, the running time of the permanent magnet motor, and the preset maximum dust intrusion threshold; wherein, the protection parameters include: the sealing gap size of the protection structure and the protection level.

[0044] This embodiment is applied to the protection and heat dissipation design of permanent magnet motors under high dust conditions. Using environmental parameters such as dust concentration and operating time, as well as inherent motor parameters such as power loss and original equivalent thermal resistance, as input conditions, the protective and heat dissipation structural parameters are calculated and screened through dust intrusion and temperature rise constraints. This determines the design parameters that meet the operating requirements in dusty environments. While meeting dust protection requirements, it effectively controls motor temperature rise, reduces the risk of heat dissipation performance degradation in dusty environments, and improves the operational reliability and environmental adaptability of permanent magnet motors in dusty environments.

[0045] The implementation steps of this embodiment are described in detail below:

[0046] Step 1: Obtaining dust environment and motor operating parameters.

[0047] Obtain the dust mass concentration in the motor operating environment Dust particle size range, and motor running time Rotation speed and ventilation structure corresponding to ventilation flow rate The above parameters serve as the basis for calculating dust entering the motor.

[0048] This embodiment selects a permanent magnet motor with a rated power of 5kW as the research object, and its operating environment is an industrial dust environment. In this embodiment, the dust mass concentration is... Based on measured data from the motor's application environment, the measured dust concentration in the environment was determined to be:

[0049]

[0050] In this embodiment, the continuous running time of the motor is:

[0051]

[0052] The ventilation flow rate corresponding to the motor ventilation structure is:

[0053]

[0054] The above parameters serve as the basic input data for calculating dust entering the motor and heat dissipation parameters.

[0055] Step 2: Determine the dust collection efficiency inside the motor.

[0056] Based on the motor ventilation structure, dust particle size range, and operating conditions, the dust collection efficiency coefficient for dust entering and remaining inside the motor with the airflow is determined through empirical data, experimental measurements, or simulation analysis. The dust collection efficiency coefficient is used to characterize the proportion of dust that deposits after entering the motor.

[0057] In this embodiment, the dust collection efficiency coefficient The results were estimated based on empirical data, taking into account the motor ventilation structure and dust particle size characteristics.

[0058] Based on the motor ventilation structure and operating conditions, this embodiment determines the dust collection efficiency coefficient as follows:

[0059]

[0060] The dust collection efficiency coefficient is used to characterize the proportion of dust that deposits inside the motor after entering with the ventilation airflow under given protective structure conditions.

[0061] Step 3: Calculation of dust deposition mass.

[0062] Based on the parameters obtained in steps 1 and 2, calculate the motor's running time. Dust deposition quality inside The calculation formula is as follows:

[0063]

[0064] in, The mass of dust deposited inside the permanent magnet motor is expressed in kg. The mass concentration of dust in the environment, expressed in kg / m³; The ventilation flow rate corresponding to the ventilation structure of the permanent magnet motor is expressed in m³ / s. The dust collection efficiency coefficient ranges from 0 to 1. The running time of the permanent magnet motor is expressed in seconds.

[0065] Dust deposition quality in this embodiment It represents the accumulation of dust inside the motor as it enters with normal ventilation airflow under a given protective structure.

[0066] In this embodiment, substituting the above parameters yields:

[0067]

[0068] Right now .

[0069] Step 4: Calculation of dust intrusion into the protective structure and setting of protective constraints.

[0070] Dust intrusion quality This characterizes the amount of dust entering the motor through gaps or leakage paths in the protective structure. This embodiment calculates the dust intrusion mass into the motor through the protective structure based on the motor's protective structure design. It can be represented as:

[0071]

[0072] in, The mass of dust entering the permanent magnet motor is expressed in kg. The equivalent leakage flow rate corresponding to the protective structure; The size of the sealing gap in the protective structure; These are protection level parameters. Among them, the equivalent leakage flow rate... It can be obtained through empirical models, experimental calibration, or simulation analysis based on the protective structure form, sealing gap size, and protection level parameters.

[0073] This embodiment sets the maximum permissible dust intrusion threshold. The protective structure parameters are determined by satisfying the following conditions:

[0074]

[0075] In this embodiment, the maximum allowable dust intrusion threshold is set as follows: ,

[0076] Substituting the parameters, the maximum equivalent leakage flow rate corresponding to the protective structure is:

[0077]

[0078] In engineering applications, the equivalent leakage flow rate is represented using a gap leakage model, and is expressed by the following formula:

[0079]

[0080] in, In order to match the geometric form of the protective structure and the parameters of the protection level The proportional coefficients related to differential pressure conditions and installation status; The gap leakage index is a value that can be taken as follows: This value is used to characterize the sensitivity of leakage flow rate to changes in the sealing gap. In engineering applications, n is taken as 2 for common leakage forms in protective structures; n is taken as 1 when the leakage channel is approximately linear and narrow; and n is taken as 3 when the leakage exhibits obvious local contraction or nonlinear flow characteristics. In this embodiment, n=2.

[0081] The scaling factor K is used to comprehensively reflect the influence of the protective structure's geometry, protection level parameter P, pressure differential conditions, and installation status on the equivalent leakage capacity. In a commonly used engineering representation, the scaling factor K is expressed as:

[0082]

[0083] in, These are reference coefficients related to the geometry of the protective structure and the differential pressure conditions. This is the protection level correction factor, used to characterize the effect of the protection level on leakage resistance, and it decreases as the protection level parameter P increases.

[0084] In this embodiment, take and take Thus, the proportionality coefficient is obtained. Therefore, the sealing gap size can be deduced. :

[0085]

[0086] Substitute into the formula:

[0087]

[0088] Right now:

[0089] In this embodiment, based on the upper limit of the allowable equivalent leakage flow rate. And combined with the gap leakage model adopted. In taking , Under these conditions, the upper limit of the sealing gap size of the protective structure can be deduced to be approximately Provided that assembly and reliability requirements are met, the sealing gap size can be selected to be no larger than this upper limit.

[0090] Step 5: Determine the original equivalent thermal resistance of the motor.

[0091] In this embodiment, the original equivalent thermal resistance of the motor in a dust-free environment is determined based on the motor's structural parameters and losses. The original equivalent thermal resistance is used to characterize the basic heat dissipation capacity of the motor.

[0092] In this embodiment, the original equivalent thermal resistance of the motor is: .

[0093] Step 6: Calculation of equivalent thermal resistance correction under the influence of dust.

[0094] Introduce the dust deposition mass calculated in step 3 The original equivalent thermal resistance of the motor was corrected to obtain the equivalent thermal resistance in a dusty environment. It can be expressed by the formula:

[0095]

[0096] in, The equivalent thermal resistance of the motor in a dusty environment; The original equivalent thermal resistance of the permanent magnet motor in a dust-free environment; This is the correction factor for the effect of dust on thermal resistance; The dust deposition quality is considered. As long as the dust deposition amount does not exceed the allowable range for the project, the effect of dust deposition on the equivalent thermal resistance can be approximated as linear.

[0097] In this embodiment, the correction factor for the effect of dust on thermal resistance Based on engineering experience, this method is used to illustrate the correction process for the impact of dust deposition on heat dissipation performance. The correction factor for the effect of dust on thermal resistance is:

[0098]

[0099] Substituting the parameters, we get:

[0100]

[0101] Right now .

[0102] Step 7: Calculation of heat dissipation structure parameters and analysis of temperature rise constraints.

[0103] This embodiment is based on motor power loss. and the corrected equivalent thermal resistance Calculate the steady-state temperature rise of the motor Its expression is:

[0104]

[0105] in, This refers to the steady-state temperature rise of the motor. This refers to the power loss of the motor.

[0106] Set the maximum allowable temperature rise of the motor In order to satisfy Under the given conditions, calculate the minimum heat dissipation area required for the heat dissipation structure. Its expression is:

[0107]

[0108] in, The minimum required heat dissipation area; The convective heat transfer coefficient; This refers to the steady-state temperature rise of the permanent magnet motor.

[0109] In this embodiment, the motor power loss is: Substituting the steady-state temperature rise of the motor in a dusty environment, we get:

[0110]

[0111] Right now .

[0112] The maximum allowable temperature rise is set as follows: The convective heat transfer coefficient is taken as:

[0113] Substituting the parameters, we get:

[0114]

[0115] Right now .

[0116] This embodiment quantitatively calculates the deposition behavior of dust after it enters the motor by comprehensively analyzing dust environment parameters, motor operating parameters, and ventilation and protection structure characteristics. It also incorporates the impact of dust deposition on the motor's heat dissipation performance into the thermal parameter calculation process. Under the dual constraints of dust protection and temperature rise, it achieves the coordinated determination of protection structure parameters and heat dissipation structure parameters, thereby improving the operational reliability and environmental adaptability of the permanent magnet motor in a dusty environment.

[0117] Based on the same inventive concept, this invention also provides a permanent magnet motor protection and heat dissipation parameter calculation system for dusty environments. Since the principles by which these systems, devices, and clients solve problems are similar to the aforementioned method for calculating permanent magnet motor protection and heat dissipation parameters for dusty environments, the implementation of these systems, devices, and clients can refer to the implementation of the aforementioned method, and the repeated parts will not be described again.

[0118] The permanent magnet motor protection and heat dissipation parameter calculation system for dusty environments disclosed in this invention embodiment refers to... Figure 2 As shown, it includes:

[0119] Acquisition module: used to acquire the dust mass concentration, dust particle size range, operating time, speed, and ventilation flow rate corresponding to the ventilation structure of the permanent magnet motor in the operating environment;

[0120] The calculation module is used to calculate the minimum heat dissipation area of ​​the permanent magnet motor based on the acquired data and the preset maximum temperature rise threshold of the motor; and to calculate the corresponding protection parameters of the permanent magnet motor based on the dust mass concentration, the running time of the permanent magnet motor, and the preset maximum dust intrusion threshold; among which, the protection parameters include: the sealing gap size of the protective structure and the protection level.

[0121] This embodiment is applicable to the protection and heat dissipation design of permanent magnet motors in high-dust environments such as mining equipment, construction machinery, and powder processing. This embodiment acquires the dust mass concentration, particle size characteristics, and motor ventilation and operating parameters in the motor's operating environment through an acquisition module. A calculation module calculates the intrusion amount and deposition mass of dust into the motor, and incorporates the impact of dust deposition on the motor's equivalent thermal resistance and temperature rise into the heat dissipation parameter calculation process. Under the dual constraints of protection and temperature rise, the protective structure parameters and heat dissipation structure parameters are determined collaboratively. Using this system, while meeting dust protection requirements, the motor temperature rise can be effectively controlled, reducing the risk of heat dissipation performance degradation in dusty environments and improving the operational reliability and environmental adaptability of permanent magnet motors in dusty environments.

[0122] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0123] 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 dust environment-oriented permanent magnet motor protection and heat dissipation parameter calculation method, characterized in that, Includes the following steps: S1. Obtain the dust mass concentration and dust particle size range in the operating environment of the permanent magnet motor, as well as the operating time, speed and ventilation flow rate of the permanent magnet motor and the ventilation structure. S2. Calculate the minimum heat dissipation area of ​​the permanent magnet motor based on the acquired data and the preset maximum temperature rise threshold of the motor; and calculate the corresponding protection parameters of the permanent magnet motor based on the dust mass concentration, the running time of the permanent magnet motor, and the preset maximum dust intrusion threshold; wherein, the protection parameters include: the sealing gap size of the protective structure and the protection level; In step S2, the calculation of the minimum heat dissipation area of ​​the permanent magnet motor based on the acquired data and the preset maximum temperature rise threshold of the motor specifically includes: S21. Calculate the mass of dust deposited by the permanent magnet motor during its operating time, expressed by the formula: wherein, is the internal dust deposition mass of the permanent magnet motor, is the dust mass concentration in the environment, is the ventilation flow corresponding to the ventilation structure of the permanent magnet motor, is the dust capture efficiency coefficient, is the running time of the permanent magnet motor; S22. Based on the dust deposition mass inside the permanent magnet motor and the original equivalent thermal resistance of the permanent magnet motor in a dust-free environment, calculate the equivalent thermal resistance of the permanent magnet motor in a dusty environment, expressed by the formula: wherein, Rthdust is the equivalent thermal resistance of the motor in a dusty environment, Rth0 is the original equivalent thermal resistance of the permanent magnet motor in a dust-free environment, Kdust is the correction coefficient of the effect of dust on the thermal resistance; S23. Based on the power loss of the permanent magnet motor and the equivalent thermal resistance of the motor in the dusty environment, calculate the steady-state temperature rise of the permanent magnet motor, and based on the preset maximum temperature rise threshold of the motor, calculate the minimum heat dissipation area required for the heat dissipation structure of the permanent magnet motor; the minimum heat dissipation area is expressed by the formula: wherein, is the minimum heat dissipation area, is the permanent magnet motor loss power, is the convective heat transfer coefficient, is the preset maximum temperature rise threshold of the motor, is the permanent magnet motor steady-state temperature rise.

2. The method of claim 1, wherein, In step S21, the dust collection efficiency coefficient is obtained based on the dust particle size range and the operating time, speed and ventilation structure of the permanent magnet motor.

3. The method of claim 1, wherein, In step S22, the original equivalent thermal resistance of the permanent magnet motor in the dust-free environment is obtained based on the structure and loss of the permanent magnet motor under dust-free conditions, and is used to characterize the basic heat dissipation capability of the permanent magnet motor.

4. The method of claim 1, wherein, In step S23, the steady-state temperature rise of the permanent magnet motor is expressed by the formula: When satisfied When the minimum heat dissipation area required for the heat dissipation structure of the permanent magnet motor is calculated, then the minimum heat dissipation area required for the heat dissipation structure of the permanent magnet motor is calculated.

5. The method of claim 1, wherein, In step S2, based on the dust mass concentration, the operating time of the permanent magnet motor, and the preset maximum dust intrusion threshold, the corresponding protection parameters of the permanent magnet motor are calculated; specifically including: Based on the dust mass concentration and the operating time of the permanent magnet motor, the dust intrusion mass that enters the permanent magnet motor through the protective structure is calculated, and expressed by the formula: in, The quality of dust entering the permanent magnet motor. To protect the equivalent leakage flow rate corresponding to the structure, To protect the structural sealing gap size, For protection level parameters; Based on the preset maximum dust intrusion threshold The corresponding protection parameters of the permanent magnet motor are calculated and expressed by the following formula: wherein, is a proportional coefficient related to the protective structure geometry, protective class parameters, differential pressure conditions and installation state, is the protective structure sealing gap leakage index.

6. The dust environment-oriented permanent magnet motor protection and heat dissipation parameter calculation system adopts the dust environment-oriented permanent magnet motor protection and heat dissipation parameter calculation method according to any one of claims 1-5, characterized in that, include: Acquisition module: used to acquire the dust mass concentration, dust particle size range, operating time, speed, and ventilation flow rate corresponding to the ventilation structure of the permanent magnet motor in the operating environment; The calculation module is used to calculate the minimum heat dissipation area of ​​the permanent magnet motor based on the acquired data and the preset maximum temperature rise threshold of the motor; and to calculate the corresponding protection parameters of the permanent magnet motor based on the dust mass concentration, the running time of the permanent magnet motor, and the preset maximum dust intrusion threshold; wherein, the protection parameters include: the sealing gap size of the protective structure and the protection level.

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