Explosion-proof motor (positive pressure motor)

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【Summary Description】It is a type of positive pressure electrical equipment. Its structural characteristics are: (1) It is equipped with a complete ventilation system, and there are no structural dead corners inside the motor that could affect ventilation. (2) The shell and ducts are made of non-combustible materials and have sufficient mechanical strength. (3) The shell and main ducts maintain a sufficiently high positive pressure relative to the external atmosphere.

It is a type of positive pressure electrical equipment. Its structural characteristics are:

(1) Equipped with a complete ventilation system, there are no structural dead corners inside the motor that could affect ventilation.

(2) The shell and pipes are made of non-combustible materials and have sufficient mechanical strength.

(3) The shell and main pipeline maintain a sufficiently high positive pressure relative to the external atmosphere.

(4) The motor must have safety protection devices (such as time relays and flow monitors) to ensure sufficient ventilation, and there must also be automatic protection or alarm devices for underpressure inside the shell.

(5) The quick-opening doors or covers on the shell must have interlocking devices with the power supply. There are currently no unified series of positive pressure motor products in our country.

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Explosion-proof motor (Increased safety motor)

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Explosion-proof motor (Increased safety motor)

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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.