Explosion-proof motor manufacturers: Why use explosion-proof motors?
2022-11-02 10:52
Explosion-proof motor manufacturers Why use explosion-proof motors?
When working in hazardous locations, the use of explosion-proof motors by explosion-proof motor manufacturers is critical for the safety of personnel and equipment. Explosion-proof servo motors are designed for hazardous environments containing flammable gases, dust, or fibers. Motors generate heat under normal operating conditions, and if a fault occurs in the motor windings, sparks may be generated. In environments containing certain hazardous substances, excessive motor casing temperatures or uncontrolled sparks may lead to explosions or fires.
Explosion-proof motor manufacturers In what environments do explosion-proof motors operate?
Motors in Class I environments (UL designation), where flammable gases, vapors, or liquids are present, are designed to prevent internal sparks or flames from escaping the servo motor into the hazardous environment. They are designed so that the temperature of the motor casing does not exceed a safe temperature in the presence of gases, vapors, or liquids.
Motors in Class II environments (UL designation), where dust or fibers are present, are designed so that the motor casing temperature does not exceed a safe temperature for combustible dust and fibers.
Explosion-proof motor manufacturers How do I know if a motor is explosion-proof?
When sparks ignite volatile gases inside the motor, the explosion-proof design includes internal combustion to prevent a larger explosion or fire. Explosion-proof servo motors are clearly marked with a nameplate to indicate whether it is suitable for a given hazardous environment. (Explosion-proof motor manufacturers)
Depending on the organization that certifies the motor, the nameplate will clearly show the motor's category, zone, and hazardous location group. UL (USA), ATEX (EU), and CCC (China) are organizations that can certify whether a motor is suitable for hazardous use. These organizations classify hazardous environments into different categories; — defining the hazards that may be present in the environment; division — determining the likelihood of a hazard occurring under normal operating conditions; and grouping identifies the specific materials present.
UL standards classify hazards into three classes: flammable gases, vapors, or liquids, combustible dust (Class II), or combustible fibers. Part 1 indicates the presence of hazardous materials under normal operating conditions, while Part 2 indicates the absence of hazardous materials under normal conditions. The group will specifically identify the hazardous materials present, such as common Class I materials such as acetylene (A), hydrogen (B), ethylene (C), or propane (D).
The EU also has similar certification requirements, classifying environments into different zones. Zones 0, 1, and 2 are designated for gases and vapors, while Zones 20, 21, and 22 are designated for dust and fibers. The zone number indicates the probability of the material being present during normal operation. Zones 0 and 20 are at a very high level, Zones 1 and 21 are at a high and normal level, and Zones 2 and 22 are at a low level. As of October 2020, China requires motors operating in hazardous environments to be CCC certified. To obtain certification, products are tested by certification and testing bodies according to the specified requirements.
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