BLDC Explosion-proof Motor 150series for Petrochemical

Technical Key Points of Explosion-proof Motors

1、Explosion-proof rating: Ensure that the selected motor meets the explosion-proof rating requirements of the working environment.

2、Performance parameters: Select the appropriate power, speed, accuracy, and other performance parameters based on actual requirements.

3、Motor structure: Select an appropriate motor structure, including the housing and sealing design, to prevent hazardous substances from entering the motor interior.

4、Control system: Select a control system that is compatible with the motor to ensure the stable operation of the motor.

Features of Explosion-proof DC Servo Motor

         Our explosion-proof DC servo motor is a widely used type of motor, featuring constant torque, low inertia, low noise, wear resistance, and maintenance-free. It is suitable for all scenarios where high precision control of position, speed, and torque is required. Such applications include machine tools, printing equipment, packaging equipment, robots, and automated production lines.

Explosion-proof motors are widely used in the following fields: 

1. Oil and gas industry: In drilling platforms, refineries, natural gas processing plants, and other locations, explosion-proof motors are used to drive equipment such as pumps, compressors, and fans. 

2. Chemical industry: In chemical production processes, many chemical substances have flammable and explosive properties, and explosion-proof motors are used in equipment for stirring, conveying, and reacting.

When selecting an explosion-proof motor, be sure to consider the following aspects:

1. Confirm the explosion-proof rating

Based on the types and concentration levels of flammable gases present in the operating environment, select a motor type that meets the corresponding **explosion-proof mark (such as Exd IIB T4, Exd IIC T3)**.

2. Determine the installation environment

For example, whether the motor is used on the ground or underground, whether it operates at high temperatures year-round, and whether there are corrosive gases such as acids or alkalis. Clear requirements should be set for the motor's protection rating (e.g., IP65) and insulation class (F, H).

3. Matching the Working Load

Select the motor's starting method and rated power based on the load characteristics. For heavy-load starting conditions, it is recommended to use a Y-series motor with high starting torque or a variable frequency drive motor.

4. High Voltage or Low Voltage Matching

High voltage motors are more suitable for equipment requiring long-distance or high-power transmission, as they can reduce line losses and cable costs.

Common Issues with DC Brushless Explosion-Proof Motors

（一) Mechanical issues of the motor itself

1.  Bearings wear out too early, make weird noises, and get really hot;

2. Shaft seal failure;

3. Stator winding insulation degradation and leakage;

4. Rotor magnet demagnetization;

5. Explosion-proof casing, joint defects;

   
   

   (二）Sensor failure (specific to brushless motors, Hall/magnetic encoder）

1. Hall signal loss, signal disorder；

2. Encoder malfunction；

（三）Common Issues with Drivers/Controllers (Highest Fault Rate)

1.  Overcurrent protection keeps tripping；

2. The motor gets really hot but doesn't deliver enough power；

3. Hard starting, shaking, low-frequency oscillation

4. Sparks inside the driver, components damaged；

5. Electromagnetic interference problem；

   
   

（四）Wiring and junction box explosion-proof issues

1. The junction box explosion-proof surface isn’t tight enough, bolts are missing, and washers weren’t installed.

2. The cable gland is failing: the seal is aging, the cable diameter doesn’t match, and there’s too much gap.

3. Combustible gas can get into the chamber, which is a major explosion-proof hazard.

4. Loose terminals are overheating: loose terminals can heat up, creating high temperatures and arc risks inside the chamber; wire gauges don’t match.

5. Extra wires and metal debris left inside the chamber can cause short circuits and sparks due to operational vibration.

（五）Unique Issues Caused by Operating Conditions and Environment (Focus on Explosion-Proof Scenarios)

1. Condensation water inside the cavity；The big temperature difference between day and night causes condensation inside sealed explosion-proof motors, forming water droplets. This reduces the insulation of the windings and corrodes circuit boards and Hall components. Many explosion-proof brushless motors need to have a breather valve or drainage structure, and if the breather valve gets blocked, it stops working.

2. High-temperature derating problem；Explosion-proof housings have poor heat dissipation. When the ambient temperature is high, running at full load can easily cause overheating, demagnetization, and insulation aging. You need to consider the high-temperature derating factor when choosing one.

3. dust buildup；The cooling fins on the casing are covered with dust, making heat dissipation worse; dust accumulates in the explosion-proof surface gaps, damaging the explosion-proof clearance.

4. Voltage fluctuation；Voltage fluctuations at industrial and mining sites triggered the drive's under-voltage and over-voltage protection, causing the motor to stop.

Please contact our sales team for details regarding model naming.

info@start-motors-tech.com (Mr.Louis)