Motor protection five coups


In the work, everyone must have encountered a lot of motor burning, some because of mechanical problems, some because of the heat problem, and some because of the lack of phase and burned.

As the saying goes, if you want to do something good, you must first sharpen your tools. So how can you avoid burning the electric motor?
Please see below

Keep the motor clean

During the operation of the motor, there shall be no dust, water stains and sundries within 3 meters of the air inlet. Otherwise, if it is sucked into the motor, a short-circuit medium will be formed, or the wire insulation layer will be damaged, causing a short circuit between the turns and burning the motor.
Therefore, to ensure the safe operation of the motor, it is necessary to keep the motor and its surrounding environment clean so that the motor can maintain a safe and stable working state during long-term operation.
Ensure that the motor is always working at rated current
The main reason for the overload operation of the motor is that the drag load is too large, the voltage is low, or the mechanical jam caused by the drive is caused. If the overload time is too long, the motor will absorb a large amount of active power from the grid, the current will increase rapidly, and the temperature will rise accordingly, which will easily burn the motor.
Therefore, it is necessary to ensure that the motor is always operated at the rated current, and also pay attention to check the operation of the transmission, the concentricity of the coupling and the gear transmission.
Pay attention to check the temperature of the motor
The staff should always check the temperature of the bearing, stator, casing and other parts of the motor. Especially for motors without voltage, current and frequency monitoring and without overload protection, it is necessary to pay attention to monitoring the temperature rise. If the temperature rise is too high, it should be immediately Stop the inspection.
In addition, the rolling elements of the bearing, the raceway surface, the bearing clearance, etc. all need to be regularly inspected. If any abnormality occurs, the bearing must be renewed before operation.
Observe the motor for vibration, noise and abnormal odor
If the motor vibrates, the part of the load connected to it will become higher, increasing the load on the motor, and overloading will burn the motor. Noise and odor are precursors to motor failure and must be observed at all times.
Therefore, the motor in operation, especially the high-power maintenance network motor should be checked frequently to see if the motor end cover, anchor bolts, bearing gland, etc. are loose, etc., once the problem is found, it must be resolved in time.

Ensure that the boot device is working properly.
In general, the quality of the starting device determines whether the motor can start normally. According to past experience, most of the burned motors are caused by improper operation of the starting equipment, such as the lack of phase start of the starting equipment, arcing of the contactor contacts, and ignition.
So how do you maintain the boot device? Mainly clean, fast, such as the contactor contacts are not clean will increase the contact resistance, causing the maintenance network to burn the contacts, and then burn the motor. Therefore, always pay attention to the cleaning and fastening work of the starting equipment. The electrical control cabinet should be located in a dry, ventilated and easy to operate position, and regularly dust.