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What is an explosion-proof motor?
To obtain certification and a nameplate, the candidate motor must meet the testing standards specified by the industry standard UL - 674: Motors and Generators for Hazardous (Classified) Locations. Manufacturers submit the expected operating specifications of the candidate motor, such as RPM, torque, power, and frequency, along with a description of related equipment, such as variable frequency drives (VFDs). UL conducts destructive testing to determine the motor's temperature rise and ensure that the motor complies with UL certification standards.
Development Trends of Explosion-Proof Motors (Petrochemical Explosion-Proof Motors)
(1) The demand for increased safety and spark-free motors is expected to rise. Users in the petrochemical system have recognized the necessity of developing increased safety and spark-free motors in their practical applications. (2) The reliability of explosion-proof motors has increasingly attracted the attention of users in the petrochemical system. As petrochemical enterprises develop towards larger installations and continuous operations, there is a demand for systems to achieve long operational cycles with little to no maintenance. Therefore, explosion-proof motors have become key equipment to ensure these requirements.
Development Trends of Explosion-Proof Motors (Mining Explosion-Proof Motors)
Developing high-power motors: The maximum installed capacity of coal mining machines in the world has exceeded 1200 kW, with the driving motor power reaching 600 kW. The maximum installed capacity of the scraper conveyor in the corresponding mining area has exceeded 1500 kW, with the driving motor power reaching 725 kW. In China, the maximum power of the driving motor for coal mining machines is 400 kW, and the maximum power of the driving motor for scraper conveyors is 315 kW.
Explosion-proof motor (dust explosion-proof motor)
The motor is designed and manufactured with an outer shell that meets specified conditions, capable of preventing dust from entering the motor housing. Even if it cannot completely stop dust from entering, the amount that does enter does not hinder the safe operation of the motor. Additionally, the accumulation of dust inside does not easily pose a risk of ignition, and its use will not cause an explosion of surrounding explosive dust mixtures.
Explosion-proof motor (spark-free motor)
This refers to a motor that, under normal operating conditions, will not ignite surrounding explosive mixtures and generally will not experience ignition failures. Compared to increased safety motors, except for the insulation dielectric strength test voltage, winding temperature rise, te (the time taken for the AC winding to reach the rated operating final temperature after starting current is applied until it rises to the limit temperature at the highest ambient temperature), and starting current ratio, which do not have special regulations like increased safety motors, other aspects are the same as the design requirements for increased safety motors.
