Permanent magnet motor sealing cabin structure parameter design method and system for dust environment

Abstract

The application discloses a dust environment-oriented permanent magnet motor sealed cabin structure parameter design method and system, comprising: obtaining operation parameters of a permanent magnet motor and environmental dust characteristic parameters and determining dust characteristic particle sizes; determining protection target criteria and dust migration characteristic criteria, establishing a corresponding relationship between sealed cabin structure parameters and dust characteristic parameters and rotor operation parameters; according to the dust characteristic particle sizes, the dust migration characteristic criteria, path lengthening requirements, internal and external airflow velocities and gas densities, performing constraint design on radial gap parameters, axial dimensions and connection parameters of the sealed cabin; based on centrifugal airflow characteristics generated by rotor rotation, designing airflow guide related parameters; through comprehensive determination of the protection target criteria, the dust migration characteristic criteria and pressure difference constraint conditions, outputting the sealed cabin structure parameters; the application can effectively reduce the probability of dust entering a rotor permanent magnet region while taking into account heat dissipation requirements, and improve operation reliability of the permanent magnet motor in a dust 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 designing structural parameters of a permanent magnet motor sealed chamber for dusty environments. Background Technology

[0002] Permanent magnet motors are widely used in industrial drives, engineering equipment, and complex working conditions due to their advantages such as high efficiency, high power density, and compact structure. However, in high-dust environments such as mines, construction sites, cement processing, and powder conveying, external dust can easily enter the motor through the motor end cover, shaft extension, and assembly gaps, especially invading the rotor permanent magnet area. After dust accumulates on the surface of the permanent magnet and its adjacent components, it will disrupt the internal airflow organization and reduce heat dissipation efficiency. Under long-term operating conditions, it may also cause wear, corrosion, and demagnetization of the permanent magnet surface, thereby affecting the motor's operational reliability and service life.

[0003] Currently, existing technologies mainly address the problem of dust intrusion leading to demagnetization of permanent magnets and decreased operational reliability in dusty environments by improving dustproof end caps, sealing components, or empirical structural protection designs and sealing dustproof schemes. Specifically:

[0004] There are technologies that reduce the entry of external dust into the motor by setting protective components with dust-blocking functions in the motor structure. For example, Chinese patent CN112104133B describes a permanent magnet synchronous motor with a dustproof end cover. By setting a dustproof plate and a sealing element at the motor end cover, the ventilation holes at the motor end are sealed to prevent dust, thereby improving the motor's protective performance in dusty environments.

[0005] Some technologies attempt to balance dust prevention with the heat dissipation performance of the motor. For example, Chinese patent CN113629931A describes a dustproof and heat-dissipating permanent magnet motor that achieves the dual functions of dust blocking and internal heat dissipation by setting up heat collection rings, heat pipes and cooling channels in the motor housing and interior.

[0006] The above methods can improve dustproof performance to some extent, but the design process lacks a systematic consideration of dust migration characteristics, motor operating parameters and airflow mechanism, making it difficult to achieve effective quantification and consistent design of protective performance under different dust environments and operating conditions.

[0007] Therefore, how to provide a method for systematically designing the structural parameters of the permanent magnet motor sealed chamber by combining dust characteristics, motor operating parameters and airflow factors, so as to improve the operational reliability and adaptability of the permanent magnet motor in a dusty environment, is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0008] In view of the above problems, the present invention provides a design method and system for the structural parameters of a sealed chamber for a permanent magnet motor in a dusty environment to overcome or at least partially solve the above problems. By analyzing the dust migration mechanism, airflow characteristics and motor operating parameters, the present invention establishes design criteria and calculation methods for the structural parameters of the sealed chamber, thereby achieving effective dust protection for the rotor permanent magnet area and improving the long-term operational reliability of the permanent magnet motor under high dust conditions.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A method for designing structural parameters of a permanent magnet motor sealed chamber for dusty environments, including:

[0011] S1. Obtain the operating parameters of the permanent magnet motor and the characteristic parameters of the environmental dust, and determine the characteristic particle size of the dust;

[0012] S2. Based on the operating parameters, determine the required protection level for the rotor permanent magnet area, in order to determine the protection target criteria for the sealed chamber, and determine the protection target threshold based on the motor application environment;

[0013] S3. Establish the correspondence between the structural parameters of the sealed chamber and the dust characteristic parameters and rotor operating parameters to obtain the dust migration characteristic criteria;

[0014] S4. Based on the criteria of dust characteristic particle size and dust migration characteristics, the radial clearance parameters between the sealed chamber and the outer surface of the rotor are constrained and designed.

[0015] S5. Based on satisfying the radial clearance constraint, determine the axial dimension parameters of the sealed chamber according to the dust migration path extension requirements;

[0016] S6. Calculate the pressure difference between the inside and outside of the sealed chamber based on the airflow velocity and gas density inside and outside the sealed chamber during rotor operation, and determine the sealing chamber connection parameters based on the allowable pressure difference threshold;

[0017] S7. Based on the characteristics of centrifugal airflow generated by rotor rotation, design the parameters related to airflow guidance within the sealed chamber;

[0018] S8. Based on the comprehensive protection target criteria, dust migration characteristic criteria, and pressure difference constraints, and combined with airflow guidance parameters, verify or guide the design of the permanent magnet motor sealed chamber structural parameters.

[0019] Preferably, in step S1, the operating parameters include at least the rotor speed or rotor angular velocity, and the environmental dust characteristic parameters include at least the dust particle size distribution, and the dust characteristic particle size is determined based on the dust particle size distribution.

[0020] Preferably, in step S2, the protection target criterion It is the ratio of the mass of dust entering the rotor permanent magnet region to the mass of external dust per unit time;

[0021] The structural parameters of the sealed chamber are designed to meet the following requirements:

[0022]

[0023] in, The protection target threshold is determined based on the motor application environment.

[0024] Preferably, in step S3, the criterion for dust migration characteristics is:

[0025]

[0026] in, Characteristic particle size of dust, The rotor angular velocity, For dust density, For gas dynamic viscosity, The characteristic radius of the rotor permanent magnet;

[0027] Dust migration characteristics criteria are used to characterize the movement trend of dust under the combined action of centrifugal force and viscous resistance. When the value exceeds the preset threshold, it is determined that the dust is unlikely to migrate to the rotor permanent magnet area.

[0028] Preferably, in step S4, the constraint condition for the radial clearance parameter between the sealing chamber and the outer surface of the rotor is:

[0029]

[0030] in, For the radial clearance of the sealed chamber, This is a safety factor used to reduce the probability of dust entering the sealed chamber through radial gaps.

[0031] Preferably, in step S5, the axial dimensional parameters of the sealed chamber satisfy:

[0032]

[0033] in, This refers to the axial length of the sealed chamber. This is the path extension factor, used to increase the migration distance required for dust to enter the rotor permanent magnet region.

[0034] Preferably, in step S6, the pressure difference between the inside and outside of the sealed chamber is:

[0035]

[0036] in, To create a pressure difference between the inside and outside of the sealed chamber, The airflow velocity inside and outside the sealed chamber, The density of the gas;

[0037] The communication parameters of the sealed chamber meet the pressure difference constraint:

[0038]

[0039] in, The set allowable differential pressure threshold is used; based on the differential pressure constraint and the preset target volumetric flow rate, the equivalent area of ​​the connected area of ​​the sealed chamber is calculated and determined to achieve a controlled balance of pressure inside and outside the sealed chamber.

[0040] Preferably, in step S7, the airflow guidance-related parameters include, but are not limited to, the radial clearance dimension of the sealed chamber, the airflow channel direction, and surface morphology parameters;

[0041] By introducing characteristic parameters of the airflow induced by rotor rotation, the linear velocity of the rotor surface, the Reynolds number of the airflow inside the sealed chamber, and the Stokes number of the dust are calculated to determine the relevant parameters for airflow guidance.

[0042] Based on rotor angular velocity and characteristic radius Calculate the linear velocity on the rotor surface. :

[0043]

[0044] Using the radial clearance of the sealed chamber as the characteristic length Calculate the Reynolds number of the airflow inside the sealed chamber. :

[0045]

[0046] Calculate the dust Stokes number:

[0047]

[0048]

[0049]

[0050] in, The dust particle response time is the time scale required for the velocity of a dust particle to adjust from its initial state and approach the airflow velocity after being subjected to resistance in a viscous fluid. The Stokes number is used to characterize the time required for the airflow to complete a significant flow change within the characteristic length scale of the sealed chamber. The Stokes number is used to determine the migration trend of dust particles under the influence of airflow and centrifugal force inside the sealed chamber. When the Stokes number is greater than the preset threshold, the inertia of the dust particles dominates, making it difficult for them to enter the rotor permanent magnet region with the airflow.

[0051] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the aforementioned method for designing structural parameters of a permanent magnet motor sealed chamber for dusty environments.

[0052] A computer device includes 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 aforementioned method for designing structural parameters of a permanent magnet motor sealed chamber for dusty environments.

[0053] As can be seen from the above technical solutions, compared with the prior art, the present invention discloses a method and system for designing the structural parameters of a sealed chamber for a permanent magnet motor in a dusty environment. By introducing the dust movement mechanism and airflow characteristic analysis, clear protection criteria and parameter calculation basis are established, realizing the systematic design of key structural parameters of the sealed chamber. The present invention can effectively reduce the risk of dust entering the rotor permanent magnet area while taking into account dustproof performance and heat dissipation requirements, significantly improving the operational reliability and environmental adaptability of the permanent magnet motor in a dusty environment, and is suitable for various high-dust working conditions such as mining equipment, engineering machinery and powder processing. Attached Figure Description

[0054] 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.

[0055] Figure 1 This is a flowchart illustrating a method for designing structural parameters of a permanent magnet motor sealed chamber for dusty environments, as provided in an embodiment of the present invention. Detailed Implementation

[0056] 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.

[0057] Example 1

[0058] This invention discloses a method for designing structural parameters of a permanent magnet motor sealed chamber for dusty environments, such as... Figure 1 As shown, it includes:

[0059] S1. Obtain the operating parameters of the permanent magnet motor and the characteristic parameters of the environmental dust, and determine the characteristic particle size of the dust;

[0060] S2. Based on the operating parameters, determine the required protection level for the rotor permanent magnet area, in order to determine the protection target criteria for the sealed chamber, and determine the protection target threshold based on the motor application environment;

[0061] S3. Establish the correspondence between the structural parameters of the sealed chamber and the dust characteristic parameters and rotor operating parameters to obtain the dust migration characteristic criteria;

[0062] S4. Based on the criteria of dust characteristic particle size and dust migration characteristics, the radial clearance parameters between the sealed chamber and the outer surface of the rotor are constrained and designed.

[0063] S5. Based on satisfying the radial clearance constraint, determine the axial dimension parameters of the sealed chamber according to the dust migration path extension requirements;

[0064] S6. Calculate the pressure difference between the inside and outside of the sealed chamber based on the airflow velocity and gas density inside and outside the sealed chamber during rotor operation, and determine the sealing chamber connection parameters based on the allowable pressure difference threshold;

[0065] S7. Based on the characteristics of centrifugal airflow generated by rotor rotation, design the parameters related to airflow guidance within the sealed chamber;

[0066] S8. Based on the comprehensive protection target criteria, dust migration characteristic criteria, and pressure difference constraints, and combined with airflow guidance parameters, verify or guide the design of the permanent magnet motor sealed chamber structural parameters.

[0067] To further implement the above technical solution, in step S1, the operating parameters include at least the rotor speed or rotor angular velocity, and the environmental dust characteristic parameters include at least the dust particle size distribution. The characteristic particle size of the dust is determined based on the dust particle size distribution.

[0068] In this embodiment, the characteristic particle size of the dust is the median particle size or the large particle size characteristic value.

[0069] To further implement the above technical solution, in step S2, the protection target criterion... The mass of dust entering the rotor permanent magnet region per unit time Compared with external dust quality The ratio;

[0070]

[0071] The structural parameters of the sealed chamber are designed to meet the following requirements:

[0072]

[0073] in, The protection target threshold is determined based on the motor application environment.

[0074] To further implement the above technical solution, in step S3, the dust migration characteristic criterion is as follows:

[0075]

[0076] in, Characteristic particle size of dust, The rotor angular velocity, For dust density, For gas dynamic viscosity, The characteristic radius of the rotor permanent magnet;

[0077] Dust migration characteristics criteria are used to characterize the movement trend of dust under the combined action of centrifugal force and viscous resistance. Greater than the preset threshold At that time, it was determined that the dust was unlikely to migrate to the rotor permanent magnet area.

[0078] To further implement the above technical solution, in step S4, the constraint condition for the radial clearance parameter between the sealing chamber and the outer surface of the rotor is as follows:

[0079]

[0080] in, For the radial clearance of the sealed chamber, This is a safety factor used to reduce the probability of dust entering the sealed chamber through radial gaps.

[0081] In this embodiment, the radial clearance of the sealing chamber is set to ensure that the centrifugal airflow generated by the rotor rotation is stably formed, while avoiding airflow blockage or dust accumulation due to excessively small clearance.

[0082] To further implement the above technical solution, in step S5, the axial dimensional parameters of the sealed chamber satisfy:

[0083]

[0084] in, This refers to the axial length of the sealed chamber. This is the path extension factor, used to increase the migration distance required for dust to enter the rotor permanent magnet region.

[0085] To further implement the above technical solution, in step S6, the pressure difference between the inside and outside of the sealed chamber is:

[0086]

[0087] in, To create a pressure difference between the inside and outside of the sealed chamber, The airflow velocity inside and outside the sealed chamber, The density of the gas;

[0088] The communication parameters of the sealed chamber meet the pressure difference constraint:

[0089]

[0090] in, The set allowable differential pressure threshold is used; based on the differential pressure constraint and the preset target volumetric flow rate, the equivalent area of ​​the sealed chamber's connecting region is calculated and determined. This is to achieve a controlled balance of pressure inside and outside the sealed chamber.

[0091] In this embodiment, to achieve controlled pressure balance inside and outside the sealed chamber, the target volumetric flow rate required for the connected area is predetermined. and within the allowable pressure difference not exceeding Under the given conditions, calculate the equivalent flow area of ​​the connected region. :

[0092]

[0093] in, For gas density, The air exchange flow rate required for pressure balance in the sealed chamber can be set according to engineering requirements, and is used as a known input in this embodiment.

[0094] To further implement the above technical solution, in step S7, the airflow guidance-related parameters include, but are not limited to, the radial clearance dimension of the sealed chamber, the direction of the airflow channel, and the surface morphology parameters.

[0095] The determination of airflow guidance parameters enables the airflow to move along a path away from the rotor permanent magnet area, and reduces the probability of dust deposition in the rotor permanent magnet area through centrifugal force and airflow shearing.

[0096] By introducing characteristic parameters of the airflow induced by rotor rotation, the linear velocity of the rotor surface, the Reynolds number of the airflow inside the sealed chamber, and the Stokes number of the dust are calculated to determine the relevant parameters for airflow guidance.

[0097] The linear velocity of the rotor surface is used to characterize the characteristic velocity level of the airflow induced by rotor rotation and is a fundamental parameter for the intensity of airflow inside the sealed chamber.

[0098] The Reynolds number of the airflow is calculated using the radial clearance of the sealed chamber as the characteristic length. This number is used to reflect the influence of the radial clearance size and surface morphology parameters of the sealed chamber on the airflow state and shear characteristics, thus providing a basis for the selection of the radial clearance size and surface morphology parameters of the sealed chamber.

[0099] The Stokes number of dust particles is used to characterize the relative relationship between the inertia of dust particles and the time scale of airflow changes. It is used to determine whether dust particles are easily swayed by airflow, thus providing a basis for setting the direction parameters of the airflow channel.

[0100] Based on rotor angular velocity and characteristic radius Calculate the linear velocity on the rotor surface. :

[0101]

[0102] Using the radial clearance of the sealed chamber as the characteristic length Calculate the Reynolds number of the airflow inside the sealed chamber. :

[0103]

[0104] Calculate the dust Stokes number:

[0105]

[0106]

[0107]

[0108] in, The dust particle response time is the time scale required for the velocity of a dust particle to adjust from its initial state and approach the airflow velocity after being subjected to resistance in a viscous fluid. The Stokes number is used to characterize the time required for the airflow to complete a significant flow change within the characteristic length scale of the sealed chamber. The Stokes number is used to determine the migration trend of dust particles under the influence of airflow and centrifugal force inside the sealed chamber. When the Stokes number is greater than the preset threshold, the inertia of the dust particles dominates, making it difficult for them to enter the rotor permanent magnet region with the airflow.

[0109] In this embodiment, step S8 involves determining the protection target criterion. Dust migration characteristics criteria and pressure differential constraints Under the premise that all design requirements are met, the corresponding sealed chamber structural parameters are output based on the airflow guidance parameters. , and Specifically, it includes:

[0110] Obtain the preliminary design parameters of the sealed chamber structure of the permanent magnet motor. Based on the protection target criteria, dust migration characteristic criteria, pressure difference constraints, and airflow guidance parameters, comprehensively judge whether the sealed chamber structure parameters meet all conditions simultaneously. If they do, obtain the final sealed chamber structure parameters of the permanent magnet motor. If they do not meet, adjust the parameter design to meet the conditions simultaneously.

[0111] Alternatively, during the preliminary design of the sealed chamber structure parameters of the permanent magnet motor, the final design of the sealed chamber structure parameters can be completed by comprehensively judging the protection target criteria, dust migration characteristic criteria, pressure difference constraints, and airflow guidance parameters.

[0112] Example 2

[0113] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for designing structural parameters of a permanent magnet motor sealed chamber for dusty environments.

[0114] Example 3

[0115] A computer device includes 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 a method for designing structural parameters of a permanent magnet motor sealed chamber for dusty environments.

[0116] Example 4

[0117] In this embodiment, an internal rotor permanent magnet motor with a rated power of 5 kW is selected as the research object;

[0118] First, obtain the operating parameters of the permanent magnet motor and the environmental dust characteristics, and then determine the characteristic particle size of the dust based on the dust particle size distribution. Specifically:

[0119] The rated speed is:

[0120]

[0121] The corresponding rotor angular velocity is:

[0122]

[0123] The characteristic radius of the rotor permanent magnet is taken as:

[0124] The target application environment is an industrial dust environment, with dust particle size distribution concentrated in the 5-50μm range. Based on the particle size distribution, the median particle size of the dust is selected as the characteristic particle size. Dust density is taken Aerodynamic viscosity is taken .

[0125] Secondly, by establishing protection target criteria and dust migration characteristic criteria, a correspondence is established between dust physical property parameters, rotor operating parameters, and sealed chamber structural parameters. Specifically:

[0126] Determine the protection target criteria: Based on the reliability requirements of the permanent magnet motor in a high-dust environment, the protection target threshold is set as follows: The design parameters of the sealed chamber structure must meet the following requirements: ;

[0127] Establishment of criteria for dust migration characteristics:

[0128]

[0129] when When the value exceeds the preset critical value, which can be set according to the actual working conditions, preferably 1, it indicates that the dust tends to migrate outward under the action of centrifugal force and is difficult to accumulate in the rotor permanent magnet area. Therefore, it can be determined that the operating conditions have a favorable dust suppression trend.

[0130] Then, the radial clearance, axial dimensions, and communication parameters of the sealed chamber were constrained and designed, and the airflow guidance parameters were determined in conjunction with the centrifugal airflow characteristics generated by the rotor rotation. Specifically:

[0131] Determination of radial clearance parameters for the sealed chamber:

[0132] Take safety factor Then the radial clearance parameter of the sealed chamber Considering both machining tolerances and assembly requirements, the final selection was made. ;

[0133] Determination of axial dimensions of the sealed chamber:

[0134] Take path extension coefficient Then the axial length of the sealed chamber Considering the overall structural layout requirements, the following was ultimately selected: ;

[0135] Calculation of communication parameters of the sealed chamber:

[0136] Based on the airflow velocity inside and outside the sealed chamber during rotor operation, a characteristic airflow velocity is selected. air density is taken Calculate the pressure difference between the inside and outside of the sealed chamber:

[0137]

[0138] The permissible differential pressure threshold is set as follows: Therefore, we can conclude that: This satisfies the differential pressure constraint condition;

[0139] The target volumetric flow rate required for the sealed chamber communication region under controlled equilibrium conditions is set as follows: Based on this pressure difference constraint, the equivalent area of ​​the connected region of the sealed chamber is determined. :

[0140]

[0141] The equivalent area of ​​the connecting area of ​​the sealed chamber is designed to be approximately... To meet the pressure differential constraint conditions and achieve a controlled balance of pressure inside and outside the sealed chamber;

[0142] Determination of airflow guidance parameters:

[0143] Rotor surface linear velocity The radial clearance of the sealed chamber is used as the characteristic length. Calculate the Reynolds number of the airflow inside the sealed chamber:

[0144]

[0145] Calculate the relevant parameters for dust Stokes number:

[0146]

[0147]

[0148]

[0149] This Stokes number indicates that the dust particles have significant inertia and are not easily carried into the rotor permanent magnet region by the airflow under centrifugal airflow and shearing action.

[0150] Finally, based on a comprehensive assessment of the protection target criteria, dust migration characteristic criteria, and pressure difference constraints, all of which meet the design requirements, the corresponding sealed chamber structural parameters are output. , and Complete the design output of the structural parameters of the sealed chamber.

[0151] In this embodiment, by implementing the method of the present invention on a selected internal rotor permanent magnet motor with a rated power of 5 kW, the probability of dust entering the rotor permanent magnet area is effectively reduced while taking into account heat dissipation requirements, thereby improving the operational reliability of the permanent magnet motor in a dusty environment.

[0152] 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.

[0153] 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 structural parameters of a permanent magnet motor sealed chamber for dusty environments, characterized in that, include: S1. Obtain the operating parameters of the permanent magnet motor and the characteristic parameters of the environmental dust, and determine the characteristic particle size of the dust; S2. Based on the operating parameters, determine the required protection level for the rotor permanent magnet area, in order to determine the protection target criteria for the sealed chamber, and determine the protection target threshold based on the motor application environment; S3. Establish the correspondence between the structural parameters of the sealed chamber and the dust characteristic parameters and rotor operating parameters to obtain the dust migration characteristic criteria; S4. Based on the criteria of dust characteristic particle size and dust migration characteristics, the radial clearance parameters between the sealed chamber and the outer surface of the rotor are constrained and designed. S5. Based on satisfying the radial clearance constraint, determine the axial dimension parameters of the sealed chamber according to the dust migration path extension requirements; S6. Calculate the pressure difference between the inside and outside of the sealed chamber based on the airflow velocity and gas density inside and outside the sealed chamber during rotor operation, and determine the sealing chamber connection parameters based on the allowable pressure difference threshold; S7. Based on the characteristics of centrifugal airflow generated by rotor rotation, design the parameters related to airflow guidance within the sealed chamber; S8. Based on the comprehensive protection target criteria, dust migration characteristic criteria, and pressure difference constraints, and combined with airflow guidance parameters, verify or guide the design of the permanent magnet motor sealed chamber structural parameters.

2. The method for designing structural parameters of a permanent magnet motor sealed chamber for dusty environments as described in claim 1, characterized in that, In step S1, the operating parameters include at least the rotor speed or rotor angular velocity, and the environmental dust characteristic parameters include at least the dust particle size distribution. The characteristic particle size of the dust is determined based on the dust particle size distribution.

3. The method for designing structural parameters of a permanent magnet motor sealed chamber for dusty environments as described in claim 1, characterized in that, In step S2, the protection target criterion It is the ratio of the mass of dust entering the rotor permanent magnet region to the mass of external dust per unit time; The structural parameters of the sealed chamber are designed to meet the following requirements: in, The protection target threshold is determined based on the motor application environment.

4. The method for designing structural parameters of a permanent magnet motor sealed chamber for dusty environments as described in claim 1, characterized in that, In step S3, the criterion for dust migration characteristics is: in, Characteristic particle size of dust, The rotor angular velocity, For dust density, For gas dynamic viscosity, The characteristic radius of the rotor permanent magnet; Dust migration characteristics criteria are used to characterize the movement trend of dust under the combined action of centrifugal force and viscous resistance. When the value exceeds the preset threshold, it is determined that the dust is unlikely to migrate to the rotor permanent magnet area.

5. The method for designing structural parameters of a permanent magnet motor sealed chamber for dusty environments as described in claim 1, characterized in that, In step S4, the constraint condition for the radial clearance parameter between the sealing chamber and the outer surface of the rotor is: in, For the radial clearance of the sealed chamber, To ensure safety, this is used to reduce the probability of dust entering the sealed chamber through radial gaps. The characteristic particle size of dust.

6. The method for designing structural parameters of a permanent magnet motor sealed chamber for dusty environments as described in claim 1, characterized in that, In step S5, the axial dimensional parameters of the sealed chamber satisfy: in, This refers to the axial length of the sealed chamber. This is a path extension factor, used to increase the migration distance required for dust to enter the rotor permanent magnet region. This refers to the radial clearance of the sealed chamber.

7. The method for designing structural parameters of a permanent magnet motor sealed chamber for dusty environments as described in claim 1, characterized in that, In step S6, the pressure difference between the inside and outside of the sealed chamber is: in, To create a pressure difference between the inside and outside of the sealed chamber, The airflow velocity inside and outside the sealed chamber, The density of the gas; The communication parameters of the sealed chamber meet the pressure difference constraint: in, The set allowable differential pressure threshold is used; based on the differential pressure constraint and the preset target volumetric flow rate, the equivalent area of ​​the connected area of ​​the sealed chamber is calculated and determined to achieve a controlled balance of pressure inside and outside the sealed chamber.

8. The method for designing structural parameters of a permanent magnet motor sealed chamber for dusty environments as described in claim 1, characterized in that, In step S7, the airflow guidance parameters include, but are not limited to, the radial clearance dimensions of the sealed chamber, the direction of the airflow channel, and surface morphology parameters; By introducing characteristic parameters of the airflow induced by rotor rotation, the linear velocity of the rotor surface, the Reynolds number of the airflow inside the sealed chamber, and the Stokes number of the dust are calculated to determine the relevant parameters for airflow guidance. Based on rotor angular velocity and characteristic radius Calculate the linear velocity on the rotor surface. : Using the radial clearance of the sealed chamber as the characteristic length Calculate the Reynolds number of the airflow inside the sealed chamber. : Calculate the dust Stokes number: in, The dust particle response time is the time scale required for the velocity of a dust particle to adjust from its initial state and approach the airflow velocity after being subjected to resistance in a viscous fluid. For gas density, For gas dynamic viscosity, Characterizes the time required for a significant flow change to occur within the characteristic length scale of a sealed chamber. Dust density, The characteristic particle size of the dust is denoted by Stokes number. Stokes number is used to determine the migration trend of dust particles under the influence of airflow and centrifugal force inside the sealed chamber. When the Stokes number is greater than the preset threshold, the inertia of the dust particles dominates, making it difficult for them to enter the rotor permanent magnet area with the airflow.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements a method for designing structural parameters of a permanent magnet motor sealed chamber for dusty environments as described in any one of claims 1 to 8.

10. A computer 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 a method for designing structural parameters of a permanent magnet motor sealed chamber for dusty environments, as described in any one of claims 1 to 8.

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