Special environments have special requirements for the insulation and protection of motors. Therefore, when concluding a motor contract, the usage environment of the motor should be determined with the customer to prevent motor failure due to inappropriate working conditions.
nsulation protection measures for chemical anti-corrosion motors Chemical anti-corrosion motors, whether installed indoors or outdoors, should have moisture-proof and anti-corrosion properties. Modern chemical plant equipment and equipment tend to be large-scale and open-air. Continuous production means that once the equipment starts running, it often cannot be shut down for maintenance for a long period of time. Therefore, the motors used in chemical plants have higher protection requirements and must be based on outdoor type. To further increase the anti-corrosion performance, the structural design should strengthen the sealing of the shell. When the water outlet must be retained in the shell, it must be closed with plastic screws. The main path of the sealed motor's breathing function is the bearing. The sealing structure with a waterproof cover and a curved ring can effectively play a protective role. The bearings of large motors should be designed to refuel and change oil without stopping, so as to be suitable for continuous production in chemical plants. Require. Exposed parts should be made of stainless steel and plastic.
Under the protection of a sealed casing, the insulation measures for chemical anti-corrosion motors can be treated similarly to tropical motors. High-voltage motors can be insulated with epoxy powder mica tape continuous insulation impregnated with overall paint or silicone rubber insulation. Insulation measures for outdoor motors The protection of outdoor motors is mainly structural protection to prevent the intrusion of small animals and rain, snow, wind and sand. The degree of sealing of the shell depends on the handling of the shaft extension and outlet wires. The bearing part of the outdoor motor should be equipped with a water slinging ring. The joint surface between the junction box and the machine base should be wide and flat. A sealing gasket should be laid in between. The incoming line should have a sealing sleeve. The end cover seam and the lifting eye hole should have rubber gaskets. The fastening screws should use countersunk head screws and sealing washers. Outdoor motor ventilation should adopt a structure to prevent wind, snow or foreign objects from entering. You can use ventilation ducts or set up baffles in the air duct to separate rain, snow and sand. Dust filters can be added in dusty areas.
In addition to selecting appropriate insulation materials, use correct insulation treatment processes to form a complete protective layer on the insulation surface. To protect against sunlight, a sun visor can be installed on the top of the shell. There should be a certain distance between the sun visor and the shell to avoid direct contact with the shell. heat transfer. In recent years, cooling boxes are often placed on the stator. In order to avoid condensation on the motor, a moisture-proof heater can be installed.
Outdoor motors can be insulated similarly to tropical motors. The development of new insulation materials and new insulation processes in recent years can reliably seal parts of the motor windings without having to seal the entire motor. Many countries use protective type instead of fully enclosed type. Protected outdoor motors can use sealed windings. That is, the windings are made of non-hygroscopic insulating materials and electromagnetic wires. After the stator winding is embedded, drip impregnation or overall impregnation process is used. The windings and joints are all sealed, which can prevent pollution and adapt to outdoor environmental conditions. Outdoor motors should use surface paint with light-aging resistance. White has the best effect, followed by silvery white. Special attention should be paid to the light-aging performance of plastics used outdoors. At low temperatures, plastics and greases tend to become brittle or solidify, so materials with good cold resistance should be used.
Post time: Sep-29-2024