The motor manufacturer reminds that in order to prevent and eliminate the sudden damage of the high-power motor leading to the production shutdown and other disturbances, the high-power motor needs to be maintained and inspected on time. In the process of utilization, if the operating temperature of the high-power motor is overheated and the stator winding insulation is too low , You need to shut down immediately for inspection.

　　The following is the inspection essentials for high-power motors compiled by Hubei Wanbang Motor Factory.

　　To deal with a high-power motor that has not been inspected for a long time, the motor should first be broken, the parts should be cleaned, and then they should be visually inspected to check for abnormalities and electrical inspection of the motor windings. This step should be Let professional maintenance masters who may have professional skills and common sense to carry out the operation, and you can also consult the motor manufacturer for technical guidance from the manufacturer.

　　XNUMX. Machine inspection of high-power motors.

　　Check whether there is a gap between the housing and end cover of the frequency conversion motor. If there is a gap, welding should be carried out. Check whether the shaft is bent and whether the assembly process is proper.In addition, turn the rotor with your hand to see if it can move. If it can't move, see if there is a foreign body stuck and if the bearing is brilliant, and then determine whether the bearing needs to be changed according to the environment.Shaft sleeve measurement, check the upper and lower outer spigots of the impeller and the common buckle ring and the inner diameter of the motor. Whether these two common gaps are within the scope of the inspection standard. If the tolerance is out of range, you need to change parts or adopt other methods. Make the common gap reach the delineated requirements, otherwise it will affect the axial balance of the motor's functions.Investigate and check the indication environment of the rotor, paying particular attention to whether there is an abnormal environment in the welding seam.

　　XNUMX. Electrical inspection of high-power motors.

　　First check the DC resistance. The three-phase resistance of the normal high-power motor should not be higher than 2%. The insulation resistance of the winding can generally reach 100Ω or more. If it is lower than 5Ω, the reason should be clarified, whether the insulation is damp or the winding is insulated. Insufficient and grounding, etc., according to the environment, dry the high-power motor insulation or contact the motor manufacturer to change the insulation. If the three-phase resistance of the stator is unbalanced, the three-phase separation of the motor coil needs to be tested against the ground voltage and the turns Try to find out where the connection is.