Dust and sand

Dust (including industrial dust) refers to particles in the range of 1 ≤ 150 microns in diameter; dust refers to quartz particles in the range of 10 - 1000 microns in diameter. When dust and dust are deposited on the insulation surface, the electrical insulation performance will be decreased due to moisture absorption, while conductive dust is more likely to cause insulation leakage or short circuit accidents.

Corrosive dust, whether acidic or alkaline, is easily hydrolyzed, resulting in corrosion of metal parts and insulators. When dust and dust enter the interior of the motor, it will cause mechanical failure and wear of parts. If the quantity is large, the air duct will be blocked and the ventilation and heat dissipation will be affected. Therefore, the motor used in industrial dusty operation area and outdoor dust area must take sand and dust prevention measures.

Salt spray effect

When the waves and waves in the ocean hit the rock bank, the droplets in the air become foggy and enter the air, so that the chloride liquid particles suspended in the air are called salt fog. Salt fog forms electrolyte on insulation and metal surface, accelerates corrosion, and seriously affects insulation performance, such as corona discharge, leakage current increase and so on.

Insects and small organisms.

Insects and small organisms are particularly harmful in the tropics. On the other hand, it makes sockets and left body inside the motor, resulting in mechanical blockage; on the other hand, it bites insulation or devours insulation material, resulting in short circuit failure. Especially termites, flying piers, mice, snakes are the most harmful.