Basic Requirements for Motors Used in Explosion-Proof Centrifugal Fans

Basic Requirements for Motors Used in Explosion-Proof Centrifugal Fans

The significant advantages of explosion-proof centrifugal fan installations are evident from their practical application outcomes.

Simultaneously, they serve as power support equipment for enhancing environmental quality. Currently, explosion-proof centrifugal fan installations are widely employed for dust removal in factories, mines, tunnels, cooling towers, vehicles, ships, and buildings.

Under normal conditions, to ensure effective operation, small-to-medium-sized explosion-proof centrifugal fans must not only meet performance parameter requirements but also satisfy fundamental criteria, primarily encompassing the following aspects:

Operating Conditions

Explosion-proof centrifugal fan units utilize various motor types, including AC motors, asynchronous motors, and air-cooled motors.

However, the motor insulation class must reach Class F, temperature rise must meet Class B standards, and the protection rating must achieve IP54.

The power supply voltage is 380V ±10%, 50Hz. Secondly, the design basis for the motor's rated performance must exceed 120% of the requirements specified for the explosion-proof centrifugal fan unit.

During full-load operation, the motor must maintain normal functioning without damage under frequency variations of 5% and voltage fluctuations of 10%.

Furthermore, during startup at rated operating voltage, the motor current must be maintained within specified limits. When using multi-phase motors in centrifugal units, the phase sequence must be marked on the terminal box nameplate, with an arrow indicating rotation direction.

Furthermore, the motor's design, manufacturing, and performance must comply with standards set by the China Electrical Standards Committee or the International Electrotechnical Commission.

Beyond the above requirements, motors for explosion-proof centrifugal ventilator units must be equipped with grounding devices. The junction box is split-type, requiring connection at both the lower and upper sections.

Viewed from the coupling side, the junction box is located on the right side of the motor in the explosion-proof centrifugal ventilator unit.