Failure Analysis of Common Faults in Electric Motor Starting
Electric motor starting is one of the most important operations in the industrial production process. The normal starting and operation of the motor directly affects the normal operation of the entire production equipment. But in the process of use, it is inevitable that some faults will occur. Today, we will analyze some of the most common faults in electric motor starting for everyone, so that everyone can better maintain and operate the electric motor and reduce the accidents caused by the motor starting.
The most common faults in electric motor starting are:
1.Startup difficulties. The sudden decrease of power supply voltage, the overload of starting current and the failures of components can make the motor difficult to start. Stalling is often caused by the failure of the contactor coil, insufficient power supply capacity or overload of the starting current.
2.The motor starts and stops frequently. The frequent startup of the motor can cause the motor contactor to fail or be damaged. In addition, when the motor is overloaded or the load torque changes suddenly, the overcurrent protection device will trip frequently and cause the motor to suddenly shut down.
3.The motor fails to start or rotate intermittent. This phenomenon may be caused by the failure of the auxiliary power supply, the failure of the acoustic leakage or the abnormal wiring of the contactor coil.
4.The motor starts but the speed is high and the power factor is low. When the motor is running, the speed is higher than the rated speed, which indicates that the excitation current of the motor is too large. This kind of fault is often caused by the failure of the excitation voltage regulator, the incorrect adjustment of the speed governor of the motor, the oversensitivity of the excitation relay, etc.
5.The output power is low and the efficiency is low. This kind of fault is often caused by poor ventilation of the motor, too much voltage fluctuation, too low voltage, overload and excessive bearing temperature, short circuit of winding and so on.
6.Heat dissipation is not good. The heat dissipation is not good, which indicates that the motor is overloaded. At this time, some measures should be taken to reduce the motor load, such as reducing the load, increasing the insulation, cooling the fan and so on.
The above are the common faults in electric motor starting, as mentioned above, some of the faults need to be dealt with in time in order to avoid economic losses. If you encounter the above mentioned situations, please contact Nanjing Hengyuan machinery experts or relevant personnel in time to deal with them.
In summary, the common faults in electric motor starting include startup difficulty, frequent motor starts and stops, failure to start or intermittent operation, high speed, low power factor, low output power and poor heat dissipation, etc. It is suggested that everyone should take regular maintenance measures for all kinds of motors, so as to reduce the occurrence of faults and make all the motors in use for a long time, safe and reliable.
