CN-121663878-B - Permanent magnet motor sealed cabin structural parameter design method and system for dust environment

CN121663878BCN 121663878 BCN121663878 BCN 121663878BCN-121663878-B

Abstract

The invention discloses a method and a system for designing structural parameters of a permanent magnet motor sealed cabin facing a dust environment, wherein the method comprises the steps of obtaining operation parameters of the permanent magnet motor and environment dust characteristic parameters, determining dust characteristic particle diameters, determining protection target criteria and dust migration characteristic criteria, establishing corresponding relations between the structural parameters of the sealed cabin and the dust characteristic parameters and rotor operation parameters, carrying out constraint design on radial clearance parameters, axial dimensions and communication parameters of the sealed cabin according to the dust characteristic particle diameters, the dust migration characteristic criteria, path extension requirements, internal and external air flow speeds and air densities, designing air flow guiding related parameters based on centrifugal air flow characteristics generated by rotor rotation, and outputting the structural parameters of the sealed cabin by comprehensively judging the protection target criteria, the dust migration characteristic criteria and pressure difference constraint conditions.

Inventors

Wang saibo
SHI YUANQING
Zhang Gerui
GONG CHAO
LU JIADONG
HAN YAOFEI
HU YIHUA
LIU DONGLIANG
Gan Chengwei
REN YUAN

Assignees

西北工业大学

Dates

Publication Date: 20260508
Application Date: 20260209

Claims (10)

1. The design method of the structural parameters of the permanent magnet motor sealed cabin facing the dust environment is characterized by comprising the following steps of: s1, acquiring operation parameters of a permanent magnet motor and environment dust characteristic parameters, and determining dust characteristic particle sizes; S2, determining the protection level requirement required by the rotor permanent magnet area according to the operation parameters so as to determine the protection target criterion of the sealed cabin, and determining the protection target threshold according to the application environment of the motor; s3, establishing a corresponding relation between the structural parameter of the sealed cabin and the dust characteristic parameter and the rotor operation parameter to obtain a dust migration characteristic criterion; s4, carrying out constraint design on radial clearance parameters between the sealed cabin and the outer surface of the rotor according to dust characteristic particle size and dust migration characteristic criteria; s5, on the basis of meeting radial clearance constraint, determining axial dimension parameters of the sealed cabin according to the dust migration path extension requirement; S6, according to the air flow speed and the air density inside and outside the sealed cabin in the running process of the rotor, calculating a pressure difference between the inside and outside of the sealed cabin and based on the permission determining a capsule communication parameter; S7, designing parameters related to air flow guidance in the sealed cabin based on centrifugal air flow characteristics generated by rotation of the rotor; s8, integrating a protection target criterion, a dust migration characteristic criterion and a pressure difference constraint condition, and verifying or guiding the structural parameters of the sealed cabin of the permanent magnet motor by combining the related parameters of air flow guiding to finish the structural parameter design of the sealed cabin of the permanent magnet motor.
2. The method for designing structural parameters of a permanent magnet motor capsule for dust environment according to claim 1, wherein in step S1, the operation parameters include at least rotor rotational speed or rotor angular speed, the environmental dust characteristic parameters include at least dust particle size distribution, and the dust characteristic particle size is determined according to the dust particle size distribution.
3. The method for designing structural parameters of permanent magnet motor sealed cabin facing dust environment as set forth in claim 1, wherein in step S2, a protection target criterion is set The ratio of the mass of dust entering the rotor permanent magnet area per unit time to the mass of external dust; the structural parameter design of the sealed cabin meets the following conditions: Wherein, the Is a protective target threshold determined according to the motor application environment.
4. The method for designing structural parameters of a permanent magnet motor sealed cabin facing to a dust environment as set forth in claim 1, wherein in step S3, the dust migration characteristic criteria are: Wherein, the Is characterized by the characteristic particle size of dust, For the angular velocity of the rotor, In order to achieve a dust density, Is the viscosity of the gas dynamic force, The characteristic radius of the rotor permanent magnet is; the dust migration characteristic criterion is used for representing the movement trend of dust under the combined action of centrifugal force and viscous resistance when And when the dust is larger than a preset critical value, judging that the dust is difficult to migrate to the rotor permanent magnet area.
5. The method for designing structural parameters of a sealed cabin of a permanent magnet motor facing a dust environment according to claim 1, wherein in step S4, constraint conditions of radial clearance parameters between the sealed cabin and an outer surface of a rotor are as follows: Wherein, the In order to seal the radial gap of the capsule, For safety factor, for reducing the probability of dust entering the interior of the capsule through the radial gap, Is the characteristic particle size of dust.
6. The method for designing structural parameters of a sealed cabin of a permanent magnet motor for dust environment according to claim 1, wherein in step S5, the axial dimension parameters of the sealed cabin satisfy: Wherein, the For the axial length of the capsule to be sealed, For the path extension factor, for increasing the migration distance required before the dust enters the rotor permanent magnet area, Is a sealed cabin radial gap.
7. The method for designing structural parameters of a sealed cabin of a permanent magnet motor facing a dust environment as set forth in claim 1, wherein in step S6, the pressure difference between the inside and the outside of the sealed cabin is: Wherein, the In order to seal the pressure difference between the inside and outside of the cabin, In order to seal the air flow velocity inside and outside the cabin, Is the gas density; The capsule communication parameters meet the pressure differential constraint: Wherein, the And calculating and determining the equivalent area of the communication area of the sealed cabin according to the pressure difference constraint and the preset target volume flow so as to realize the controlled balance of the internal pressure and the external pressure of the sealed cabin.
8. The method for designing structural parameters of a sealed cabin of a permanent magnet motor for dust environment according to claim 1, wherein in step S7, the air flow guiding related parameters include, but are not limited to, radial gap dimension of the sealed cabin, air flow channel direction and surface morphology parameters; calculating the linear speed of the rotor surface, the Reynolds number of the air flow in the sealed cabin and the Stokes number of dust by introducing the characteristic parameters of the air flow induced by the rotation of the rotor so as to determine the relevant parameters of air flow guiding; According to angular velocity of rotor Feature radius Calculating the rotor surface linear velocity : With radial clearance of capsule as characteristic length Calculating the Reynolds number of the air flow in the sealed cabin : Calculating the Stokes number of dust: Wherein, the Characterizing the time scale required by the movement speed which is adjusted from the initial state and approaches to the air flow speed after the dust particles are subjected to resistance action in viscous fluid for the response time of the dust particles; in order to achieve a gas density of the gas, Is the viscosity of the gas dynamic force, The time required for the airflow to complete a significant flow change within the capsule characteristic length scale is characterized, In order to achieve a dust density, The Stokes number is used for judging the migration trend of dust particles under the actions of airflow and centrifugation in the sealed cabin, and when the Stokes number is larger than a preset threshold value, the inertia of the dust particles is dominant, so that the dust particles are difficult to enter a rotor permanent magnet area along with the airflow.
9. A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when executed by a processor, implements a method for designing structural parameters of a permanent magnet motor capsule for dust-oriented environment according to 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 operable on the processor, wherein the processor implements a method for designing structural parameters of a permanent magnet motor capsule for a dust environment according to any one of claims 1 to 8 when executing the program.

Description

Permanent magnet motor sealed cabin structural parameter design method and system for dust environment Technical Field The invention relates to the technical field of permanent magnet motor protection and reliability design, in particular to a dust environment-oriented permanent magnet motor sealed cabin structural parameter design method and system. Background The permanent magnet motor is widely applied to industrial driving, engineering equipment and complex working condition occasions due to the advantages of high efficiency, high power density, compact structure and the like, however, in high dust environments such as mines, building construction, cement processing, powder conveying and the like, external dust easily enters the interior of the motor through a motor end cover, a shaft extension part and an assembly gap, particularly easily invades a rotor permanent magnet area, dust can damage internal airflow tissues and reduce heat dissipation efficiency after the permanent magnet and the surfaces of adjacent parts are deposited, and the surface abrasion, corrosion and demagnetizing risks of the permanent magnet can be possibly caused under long-term operation conditions, so that the operation reliability and the service life of the motor are affected. At present, the prior art mainly solves the problems that when a permanent magnet motor operates in a dust environment, dust invasion leads to demagnetization of a permanent magnet and operation reliability is reduced by improving a dustproof end cover, a sealing member or an empirical structure protection design and a sealing dustproof scheme, and is specific: In the prior art, external dust is reduced from entering the motor by arranging a protection component with a dust blocking function in the motor structure, for example, a permanent magnet synchronous motor with a dustproof structure on an end cover is disclosed in Chinese patent CN112104133B, and a dustproof plate and a sealing piece are arranged at the end cover of the motor to prevent dust from blocking a vent hole at the end part of the motor, so that the protection performance of the motor in a dust environment is improved; There are also attempts to give consideration to the heat dissipation performance of the motor while preventing dust, for example, chinese patent CN113629931a, a dustproof heat dissipation type permanent magnet motor, and by arranging a heat collecting ring, a heat pipe, a cooling channel and other structures inside the motor housing, the dual functions of dust blocking and internal heat dissipation are achieved; the method can improve the dustproof performance to a certain extent, but the design process lacks systematic consideration of dust migration characteristics, motor operation parameters and airflow action mechanisms, and effective quantification and consistency design of the protective performance are difficult to realize under different dust environments and operation conditions. Therefore, how to provide a method for systematically designing the structural parameters of the sealed cabin of the permanent magnet motor by combining the dust characteristics, the motor operation parameters and the airflow factors, so as to improve the operation reliability and adaptability of the permanent magnet motor in the dust environment is a problem to be solved by those skilled in the art. Disclosure of Invention In view of the above problems, the present invention is to provide a method and a system for designing structural parameters of a permanent magnet motor sealed cabin for overcoming the above problems or at least partially solving the above problems, by analyzing a dust migration mechanism, airflow characteristics and motor operating parameters, and establishing a design criterion and a calculation method for the structural parameters of the sealed cabin, effective dust protection of a rotor permanent magnet area is achieved, so as to improve long-term operation reliability of the permanent magnet motor under a high dust condition. In order to achieve the above purpose, the present invention adopts the following technical scheme: a design method of structural parameters of a permanent magnet motor sealed cabin facing a dust environment comprises the following steps: s1, acquiring operation parameters of a permanent magnet motor and environment dust characteristic parameters, and determining dust characteristic particle sizes; S2, determining the protection level requirement required by the rotor permanent magnet area according to the operation parameters so as to determine the protection target criterion of the sealed cabin, and determining the protection target threshold according to the application environment of the motor; s3, establishing a corresponding relation between the structural parameter of the sealed cabin and the dust characteristic parameter and the rotor operation parameter to obtain a dust migration characteristic criterion; s4, carrying out constrain