Three Phase Asynchronous Motors Classified By Motor Protection Form

① Open type motors do not have specialized protection for rotating and live parts, except for necessary support structures.
② Mechanical protection is necessary for the rotating and live parts inside the protective motor, but it does not significantly hinder ventilation. According to their different ventilation protection structures. There are three types: mesh cover, drip proof, and splash proof. The anti drip type is different from the anti splash type. The anti drip type can prevent solid or liquid falling vertically from entering the interior of the motor, while the anti splash type can prevent liquid or solid from entering the interior of the motor in any direction within a range of 1000 degrees from the vertical line.
③ The enclosed motor casing structure can prevent free exchange of air inside and outside the casing, but it does not require complete sealing.
④ The waterproof motor casing structure can prevent water with certain pressure from entering the interior of the motor.
⑤ When the motor is submerged in water, the structure of the motor casing can prevent water from entering the interior of the motor.
⑥ Submersible electric motors can operate in water for a long time under the specified water pressure.
⑦ The structure of the explosion-proof motor casing can prevent the gas explosion inside the motor from being transmitted to the outside of the motor, which can cause the explosion of combustible gases outside the motor.