If you find that the temperature of the motor stator, r […]
If you find that the temperature of the motor stator, rotor winding or stator core is abnormal, you can check it from the following aspects.
(1) First check whether the load condition of the motor is normal, such as: whether the three-phase current and voltage values are within the rated value, whether the three-phase negative weight is balanced, and whether the excitation current exceeds the normal value. If the load is found to be abnormal, try to adjust the load; if the excitation current is too large, try to reduce it. After adjustment, it is still invalid, and the possibility of short circuit between turns of the rotor winding should be considered.
(2) If the operation of the motor is within the normal range, and the temperature rise of the stator winding and the stator core has exceeded the normal value, it indicates that the motor itself or the ventilation cooling system associated with it has an abnormal situation, and the cause must be found. exclude.
(3) Check the temperature of the inlet and outlet air. For non-closed ventilation motors such as protective and ducted ventilation, if the inlet air temperature is normal and the outlet air temperature is higher than the normal value, the air duct may be blocked and the air duct should be blocked. Check for cleaning. For closed circulating ventilation cooled motors, the possibility of air duct blockage is small. If the inlet air temperature is too high, the cooler is faulty or the cooling water flow is insufficient. Check the cooler. When detecting the wind path. It is necessary to note whether the inlet and outlet are adjacent to each other and whether there is a backflow phenomenon.
(4) Check if the bearing is loose and there is no friction. Because the rotor is rubbed, the temperature will rise. (5) If the temperature rise of the stator is still high after the above inspection and treatment, it is possible to consider whether there is any defect in the insulation, and if there is any additional insulation treatment for the motor.