The explosion-proof motor is in operation，Multiple failures can occur due to various factors。Here are some common explosion-proof motor failures and their possible causes：

one、Electrical fault

1. Over duty

• reason：When the motor is running for a long time or under excessive load，Can cause the motor to overheat，Overload failure。This may be due to excessive load、Caused by factors such as poor cooling or aging insulation。

• solution：Check load，Ensure that the load does not exceed the rated load of the motor，And timely adjust the load and motor matching degree。meanwhile，Check cooling system，Make sure the cooling effect is good，And check the motor insulation status regularly，Replace insulation materials or repair damaged insulation in time。

2. Phase missing operation

• reason：When the motor is running in the absence of phase，Abnormal sounds and vibrations occur，And the current may exceed the normal value。This is usually due to a faulty power line、Caused by contactor failure or internal motor failure。

• solution：Stop immediately to check whether the power line and contactor are normal，If necessary，Replace damaged electrical components。meanwhile，Check whether there is a winding short circuit or open circuit fault inside the motor，And repair it。

3. Three phase current unbalance

• reason：The three-phase current imbalance may be due to the three-phase supply voltage imbalance、The number of three-phase turns is inconsistent or three-phase load imbalance and other factors caused。This will cause the stability of the device to decrease，Increase in energy consumption，It might even burn the windings。

• solution：Check whether the three-phase power supply voltage is balanced，Adjust the number of three phase turns to make them consistent，And ensure the three-phase load balance。If necessary，Repair and adjust the motor。

4. Winding fault

• reason：A winding fault may include a short circuit in the winding、Disconnect or insulation aging, etc。This is usually due to the electricity running for a long time、Caused by factors such as high temperature or aging of insulating materials。

• solution：Check winding insulation regularly，Replace insulation materials or repair windings if necessary。meanwhile，Pay attention to maintain good ventilation and heat dissipation conditions of the motor，Avoid winding overheating。

two、Mechanical failure

1. Bearing failure

• reason：Bearing failure may be caused by poor lubrication、Bearing wear or improper installation and other factors。This leads to loud motor noise、Large vibration or abnormal operation。

• solution：Fill lubricating oil or grease regularly，Make sure the bearings are well lubricated。meanwhile，Check bearing wear regularly，Replace bearings in time if necessary。When installing bearings，Ensure proper installation and reliable fastening。

2. Axial bending

• reason：Shaft bending may be caused by long working hours or excessive load。Shaft bending will affect the normal operation and stability of the motor。

• solution：Do the straight shaft treatment and replace the new shaft。When replacing the shaft，Ensure that the quality and size of the shaft meet the requirements，And properly installed and adjusted。

3. Explosion surface damage

• reason：Explosion surface damage may be due to the production process、Caused by improper operation during assembly or use。In addition，Condensation inside the motor in a humid environment may also lead to corrosion of the explosion-proof surface。

• solution：Strictly comply with relevant regulations and technical requirements during production and assembly，Ensure the integrity and quality of the explosion surface。In the process of use，Keep the motor dry and ventilated，Avoid the impact of wet environment on the explosion surface。If the explosion-proof surface is damaged，It should be repaired or replaced in time。

three、Other faults

1. The no-load current is too large

• reason：Excessive no-load current may be logarithmic with the motor pole、Magnetic conductivity material or motor power and other factors。This is usually caused by a problem in the design or manufacturing process。

• solution：The current design is adjusted according to the actual operating conditions of the motor。If necessary，Overhaul and adjust the motor to reduce no-load current。

2. Excessive temperature

• reason：Excessive motor temperature may be due to overload、Poor heat dissipation、The ambient temperature is too high。This will affect the normal operation and life of the motor。

• solution：Check whether the load and heat dissipation system of the motor are normal，Make sure there is enough space and good ventilation around the motor。meanwhile，Pay attention to control the ambient temperature within the range that the motor can bear。If the motor temperature is too high，Stop the machine immediately for inspection and take cooling measures。

To sum up，The common faults of explosion-proof motor involve two aspects: electrical and mechanical。In order to ensure the normal operation of explosion-proof motor and extend the service life，Regular inspection and maintenance work is required，Discover and handle potential faults in a timely manner。meanwhile，In the process of use should pay attention to comply with the relevant regulations and technical requirements，Ensure the safe operation of the motor in inflammable and explosive dangerous places。