1. Look: The normal operation of the motor has a great relationship with the surrounding environment. Therefore, in the process of daily inspection, check the water leakage and dripping conditions around the motor (which will cause the low insulation of the motor to form a breakdown and burn out), and check whether there are objects around the motor that affect its ventilation and heat dissipation environment. In order to ensure the cooling and heat dissipation of the motor, the external part of the motor is treated at a high frequency and at regular interval, although the dirt of the end cover and fan blades of the electric fan seems to have little effect, in fact, it accounts for a large proportion of the daily protection of the motor.
2. Touch: Experienced maintenance personnel can judge the operation status of the motor by touching their hands. Rome was not built in a day, and the accumulation of long-term experience is also an important part of the daily inspection and protection of electric motors. If the overall temperature of the motor is higher than the normal operating temperature, it is necessary to check the load, assembly and ventilation of the motor in combination with the motor operating current, and when the bearing condition is good, the temperature at both ends will be lower than the temperature of the center winding section.
3. Measurement: When the motor stops working, it is necessary to measure the insulation resistance of each phase or relative of the motor with an insulation meter at regular intervals (preferably every month), and find the insulation defects in time after comparing with the results of the previous month's test. Taking a three-phase asynchronous motor as an example, the measured unbalance of the three-phase resistance cannot exceed 2%, and when the insulation resistance is checked, if it is lower than 5MΩ, it is necessary to analyze the cause of this abnormal condition. Check whether the insulation is damp, or whether the grounding condition is formed due to poor insulation of the windings, etc. If the three-phase resistance of the stator is unbalanced, the three-phase resistance of the motor coil is separated from the ground withstand voltage test and the inter-turn test has been found out of the grounding point. Unless there are special circumstances, do not turn off the heating switch of the motor equipped with electric heating. If the motor is found to be soaked in water, the motor should be broken and the rotor should be extracted, and then dried with compressed air, and then baked from both ends of the motor stator with a baking lamp until the motor is properly insulated.
4. Listening: The sound discrimination of motor operation is also an important part of motor viewing and protection. Since the machine room can be noisy, it is important to rely on auxiliary tools such as screwdrivers or listening sticks. Close to the two ends of the motor, after a long period of accumulation, we can not only find the bad vibration of the motor and its driving equipment, but also can judge the amount of internal bearing oil. Timely addition of bearing oil or replacement of new bearings and other methods can significantly prevent the blockage, outer circle, and burnout of the motor bearing caused by the lack of oil and dry grinding.
5. Do: The abnormal condition of some motors may not be easy to detect, and the screws, wiring fastening, dismantling and viewing, cleaning and maintenance of the motor according to the maintenance cycle (generally one month) can often cause unexpected effects. If you don't look at it and don't do it, or just look at it and don't do it, it will eventually form a problem or incident. For example, the motor wiring stud is loose and the virtual touch causes the lack of phase burnout, and the motor burns out if the lubricating oil is not replenished in time or the contract is replaced. Insist on carefully looking, touching, measuring, doing, listening, the vast majority of faults can be glazed to prevent and prevent, these fundamental protection methods have a great meaning for the protection and daily maintenance of the motor, but this is far from enough, as mentioned earlier, the continuous accumulation of experience, and constantly summarize and refine to improve the ability of personal motor protection and maintenance, is the condition for us to improve the power of the motor and improve the output.
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