To understand motor protection, we must first know what motor protection is. Motor protection is to give the motor comprehensive protection, that is, when the motor appears overload, lack of phase, blocking, short circuit, overvoltage, undervoltage, leakage, three-phase imbalance, overheating, bearing wear, fixed rotor eccentricity, alarm or protection; The device that provides protection for the motor is the motor protector, including thermal relays, electronic protectors and intelligent protectors. At present, intelligent protection devices are generally used for large and important motors. The contents of regular maintenance are as follows.
(1) Clean the motor. Remove dust and sludge from the outside of the motor frame in time. If the use of environmental dust
Yes, you'd better clean it once a day.
(2) Check and clean the motor terminal. Check whether the wiring screws of the junction box are loose or burned.
(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 bold, damaged, and 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 be cleaned in time to wipe the external dust, wipe the contacts, check whether the wiring parts have burn marks, and whether the grounding wire is good.
(6) Bearing inspection and maintenance. Bearings should be cleaned and replaced with grease or lubricating oil after use for a period of time. The time of cleaning and oil change should be determined by the working condition of the motor, the working environment, the degree of cleanliness, and the type of lubricant, and half of it should be cleaned once every 3-6 months and replaced with grease. When the oil temperature is high, or the motor with poor environmental conditions and more dust should be cleaned and oil changed frequently.
(7) insulation inspection. The insulating capacity of the insulating material varies according to the degree of drying, so it is very important to check the drying of the motor winding. The presence of factors such as damp working environment of the motor and corrosive gases in the working room will destroy the electrical insulation. The most common is the winding grounding fault, that is, the insulation damage, so that the live part and the housing should not be charged metal part of the collision, the occurrence of this fault, not only affect the normal operation of the motor, but also endanger personal safety. Therefore, the motor in use, should often check the insulation resistance, but also pay attention to check the motor housing grounding is reliable.
(8) In addition to regular maintenance of the motor according to the above contents, it should be overhauled after one year of operation. The purpose of the overhaul is to carry out a thorough and comprehensive inspection and maintenance of the motor, supplement the missing and worn components of the motor, completely eliminate the dust and dirt inside and outside the motor, check the insulation, clean the bearing and check its wear. Find problems and deal with them in time.
