Inspection items for high voltage motors

Update:28 Apr 2022
Summary:1. Clean and wipe the motor. Remove dust and sludge from the outside of the motor base in time. If there is a lot of dus...
1. Clean and wipe the motor. Remove dust and sludge from the outside of the motor base in time. If there is a lot of dust in the environment, it is best to clean it once a day.
2. Check and clean the motor terminals. Check the junction box wiring screws for looseness and burns.
3. Check the screws of each fixed part, including anchor screws, end cap screws, bearing cap screws, etc. Tighten the loose nut.
4. Check the transmission device, check whether the pulley or coupling is strong or damaged, whether the installation is firm; whether the belt and its coupling buckle are in good condition.
5. The starting equipment of the motor should also wipe the external dust and contacts in time, check whether there are burn marks on each wiring part, and whether the grounding wire is in good condition.
6. Inspection and maintenance of bearings. Bearings should be cleaned and replaced with grease or lubricating oil after a period of use. The time of cleaning and oil change should be determined according to the working conditions of the motor, working environment, cleanliness, and type of lubricant. Half of the time should be cleaned once every 3-6 months, and the grease should be changed again.
When the service life of the bearing is over, the vibration and noise of the motor will increase significantly. When the radial clearance of the bearing reaches the following value, the bearing should be replaced. When the oil temperature is high, or the motor with poor environmental conditions and a lot of dust should be cleaned and changed frequently.
7. Check the insulation condition. The insulating ability of insulating materials varies depending on the degree of dryness, so it is very important to check the dryness of the motor windings. The reduction of insulation resistance of high-voltage motors is usually caused by the insulation of the motor being affected by moisture, pollution and insulation aging. The motor insulation is aging and seriously polluted by carbon powder. Moisture in the working environment of the motor, corrosive gases in the work room and other factors will damage the electrical insulation.
The most common is the winding ground fault, that is, the insulation is damaged, so that the live part collides with the metal parts that should not be charged, such as the casing. The occurrence of this fault will not only affect the normal operation of the motor, but also endanger personal safety. Therefore, when the motor is in use, the insulation resistance should be checked frequently, and attention should also be paid to check whether the grounding of the motor casing is reliable.