1. Always keep the high voltage motor clean
When the motor is running, dust, water stains and other sundries are not allowed within at least 3m around the air inlet to prevent suction into the motor, short-circuiting medium, or damage to the wire insulation layer, causing short circuit, increasing current, and increasing temperature. Burn the motor. Therefore, to ensure that the motor has sufficient insulation resistance, as well as a good ventilation and cooling environment, the motor can maintain a safe and stable working state during long-term operation.
2, keep the motor often working at rated current
The main reason for the overload operation of the motor is that the load is too large, the voltage is too low, or the mechanical jam is caused. If the overload time is too long, the motor will absorb a large amount of active power from the power grid, the current will increase sharply, and the temperature will also rise. At high temperature, the insulation of the motor will burn out. Therefore, in the operation of the motor, it is necessary to pay attention to whether the transmission operation is flexible and reliable; whether the concentricity of the coupling is standard; the flexibility of the gear transmission. If there is any stuck card, stop it immediately and find out the cause and then run it.
3, often check whether the motor three-phase current is balanced
For a three-phase asynchronous motor, the difference between the current of any one phase of the three-phase current and the average of the other two currents must not exceed 10%, so as to ensure the safe operation of the motor. If it is exceeded, it indicates that the motor is faulty and must be ascertained.
4, check the temperature of the motor should always check the temperature of the bearing, stator, casing and other parts of the motor for abnormal changes
Especially for motors without voltage, current and frequency monitoring and without overload protection, monitoring of temperature rise is more important. If the motor bearing is overheated and lacks oil, if it is found that the temperature rise near the bearing is too high, it should be stopped immediately. Whether the bearing rolling element and the raceway surface are cracked, scratched or damaged, whether the bearing clearance is excessively shaken, and whether the inner ring rotates on the shaft or the like. Any of the above phenomena occurs. All bearings must be renewed before they can be reworked.
5. Observe the motor for vibration, noise and abnormal odor.
If the motor vibrates, it will cause the load part connected to it to increase in different degrees of heart, and the load on the motor will increase. When the load is overloaded, the motor will be burnt. Therefore, in the operation of the motor, especially the high-power motor, it is necessary to check whether the anchor bolt, the motor end cover, the bearing gland, etc. are loose, the grounding device is reliable, and the problem is solved in time. Noise field sounds and odors are precursors to abnormal motor operation and serious failures. It is necessary to find and identify the cause of the problem.
6, to ensure that the startup device works properly
The technical state of the motor starting device plays a decisive role in the normal starting of the motor. Practice has proved that the vast majority of burned motors are mostly caused by improper operation of the starting equipment. If the starting device has a phase loss start, the contactor contacts are arced, fired, etc. The maintenance of the starting equipment is mainly clean and fast. If the contacts of the contactor are not clean, the contact resistance will increase, causing the heat to burn out the contacts, causing the phase loss and burning the motor; the core of the contactor sucking coil is rusted and dusted. Accumulation, the coil will not be tightly engaged, and strong noise will occur, increase the coil current, burn the coil and cause a malfunction.