In the fields of chemical engineering, oil and gas, and pharmaceuticals, the selection of explosion-proof AC servo motors must strictly follow environmental hazard levels, performance requirements, and safety standards to ensure stable operation of the system in flammable and explosive environments. The following is a specific selection guide:

1、 Core selection parameters

Explosion proof grade matching

Select motors with corresponding explosion-proof levels based on the environmental hazardous areas (such as Zone 0, Zone 1, Zone 2) and gas groups (IIA, IIB, IIC). For example:

Chemical reaction kettle: requires Class IIC explosion-proof (applicable to highly explosive gases such as hydrogen and acetylene), such as Exd Ⅱ CT4.

Oil and gas transmission pipelines: Class IIB explosion-proof (applicable to propane and ethylene), such as Exd Ⅱ BT4.

Pharmaceutical workshop: Dust environment requires ExtDA21 (Dust Explosion proof Certification).

Power and speed

Load demand: Select the motor based on the power and speed requirements of the driving equipment (such as pumps, valves, mixers). For example, to drive a large mixer, a motor with a power of ≥ 15kW and a speed of 0-1500rpm needs to be selected.

Speed range: Priority should be given to motors with a wide speed range (0-3000rpm) to adapt to different operating conditions.

Torque and acceleration

Start stop requirement: If quick start stop or precise positioning is required (such as trajectory tracking of explosion-proof robots), choose a motor with high torque and fast acceleration (such as 3 times the rated torque overload capacity).

Low speed torque: In low-speed and high torque scenarios such as valve manual/automatic switching, it is necessary to ensure that the motor outputs stably at low speeds.

2、 Environmental adaptability

Temperature and Humidity

The motor needs to adapt to the ambient temperature range (such as -40 ℃ to+60 ℃) and have waterproof and dustproof capabilities (IP65 or above).

In high-temperature environments, choose motors with surface temperature ≤ T6 level (85 ℃) to avoid igniting flammable gases.

Corrosion gas protection

The surface of the explosion-proof shell is coated with corrosion-resistant coatings such as ETFE, and the corrosion condition is checked regularly (such as once every quarter).

3、 Certification and Standards

International Certification

Export equipment must comply with ATEX (European) and IECEx (International) certifications, while domestic equipment must pass GB3836 certification.

For example, the ParkerEX series explosion-proof servo motors comply with both North American and European safety standards.

Energy efficiency and reliability

Choose motors with high energy efficiency levels (such as IE3, IE4) to reduce long-term operating costs.

Prioritize choosing brands certified by major oil and gas companies (such as ABB, Siemens) to ensure reliability.

4、 Application scenario adaptation

chemical engineering field

Reaction kettle stirring: Choose a motor with high acceleration and deceleration capabilities and a wide speed range, combined with precision valve control.

Pipeline transportation: prioritize explosion-proof motors (Exd) to prevent internal explosions from causing external accidents.

oil and gas sector

Drilling platform: requires Exd Ⅱ BT4 or above explosion-proof rating, suitable for harsh marine environments.

Valve control: Choose motors with high torque and fast response to achieve precise flow regulation.

Pharmaceutical field

Drug synthesis workshop: Choose dust explosion-proof motor (ExtD) to prevent organic matter vapor ignition.

Extraction workshop: Priority positive pressure type motor (Exp) maintains positive pressure inside the casing by introducing clean gas.

5、 Maintenance and Cost

Maintenance points

Unauthorized disassembly of the casing is prohibited to avoid damaging the explosion-proof structure.

Regularly inspect the sealing of junction boxes and cable entry devices to prevent loosening or aging.

Check the temperature rise of the motor every month to ensure that the surface temperature is ≤ T group limit.

cost-effectiveness

In the budget, explosion-proof stepper motors can be considered (cost reduction of 30% -50%), but some precision and response speed need to be sacrificed.

Precision scenes (such as explosion-proof robots) require priority selection of servo systems to ensure a balance between safety and efficiency.