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What are the waterproof and moisture-proof methods for brushless DC motors?

Update:11-06-2021
Summary:...
Most brushless DC motors are not moisture-proof. To a large extent, because their office environment is not moisture-proof, waterproof coatings not only increase the cost, but also limit the overall characteristics. This cost is generally only useful for special main purposes, such as pumps. And the solution of the liquid, the possibility of other applications that are in contact with the motor liquid is very high. Due to water and organic solvents, fitness motion control systems often suffer from corrosion and ineffective risks. Moisture-proof motors are the core components to deal with common faults in water and motors. The motor manufacturing industry has standardized liquid protection measures called IP waterproof rating. Power installation projects and motor manufacturers must comply with the applicable standards.
Common and effective waterproof methods for brushless DC motors:
Brushless DC motor moisture-proof motors can work under 30 feet in the deep sea. This is a general industry standard named after moisture-proof. It is not a modified standard motor, but a real moisture-proof motor. They can work very well in the natural environment of deep water. Work-in various industrial production and marine resources, the motor has data redundancy, pump seals, o-rings, airtight cable communication routes, working pressure balance and other moisture-proof functions. The characteristics of the design scheme enable the motor to consider the design scheme technology The requirements of personnel on the motor, even if exposed to most of the liquid or permeated for a long time, the motor will not have common faults.
When exploring moisture-proof solutions, various countermeasures propose different levels of liquid waterproofing. For example, under special circumstances, some people just avoid splashing water, while others completely swallow the motor and must achieve a special deep layer. Many moisture-proof methods allow restricted gas to flow into the motor, which adversely affects the high-power output of the Brushless DC Gear Motors.
The general and reasonable way to prevent moisture from the motor is as follows
Unique housing: Covering the motor with a unique housing is one of the common ways to avoid water hazards. The professional housing is too high.
Moisture-proof pump seal: Maintain the motor's fitness moving parts, especially the shaft and rolling bearings. The moisture-proof pump seal creates a closed area for the internal work of the motor.