1. First of all, the visual inspection can find the following abnormal phenomena: whether the external fastener of the motor is loose, whether the parts are damaged, whether the surface of the equipment is oily or corroded; whether the contact points and joints of the motor are discolored, Burn marks and smoke marks. The reason for these phenomena is due to local overheating of the motor, poor conductor contact or burnt of the windings; If the voltmeter is not indicated or is abnormal, it indicates that the power supply voltage is unbalanced, the fuse is blown, the three-phase resistance of the rotor is unbalanced, single-phase operation, and poor conductor contact. If the ammeter indication is too large, it indicates motor overload, bearing fault, winding turn-to-turn short circuit, etc.; motor stalls, caused by: power failure, single-phase operation, low voltage, too small motor torque, excessive load, voltage Falling too large, bearing burned, mechanically stuck, etc.
2, using the auscultation rod to hear the various noises of the motor, including electromagnetic noise, ventilation noise, mechanical friction sound, bearing noise, etc., so that the cause of the motor failure can be judged. The causes of noise are mechanical: bearing failure, mechanical imbalance, loosening of the fastening screw, non-conformity of the coupling connection, rubbing of the stator core, etc.; electrical: voltage imbalance, single-phase operation, winding There are open circuit or breakdown failures, poor starting performance, and poor acceleration performance.
3, by smell, you can find the cause of burnt smell, odor caused by: motor overheating, winding burnout, single-phase operation, winding faults, bearing failures.
4, by touching the surface of the casing by hand, you can find that the temperature of the motor is too high and the vibration caused by the vibration is caused by unbalanced mechanical load, looseness of each fastening component, insufficient strength of the motor foundation, improper coupling of the coupling, Uneven air gap or mixed debris, voltage imbalance, single-phase operation, winding failure, bearing failure, etc.
The cause of excessive motor temperature is overload, cooling air duct blockage, single-phase operation, turn-to-turn short circuit, high or low voltage, three-phase voltage imbalance, poor acceleration characteristics, long starting time, stator and rotor phases. Bad contact of the wiper, starter, frequent start and brake or reverse brake, excessive inlet air temperature, mechanical jam, etc.
When the temperature of the motor is estimated by hand to estimate the temperature, since each person's feeling is different and subjective, it is determined by experience.
Routine maintenance inspections are divided into daily inspections, monthly or periodic inspections, and annual inspections.
In the daily inspection, the main inspection of the lubrication system, appearance, temperature, noise, vibration and abnormal phenomena, but also check the ventilation cooling system, sliding friction conditions and the fastening of various components, and carefully check the records.
During monthly or regular inspections, check whether the switch, wiring, grounding device, etc. are loose or not, and if there are any damaged parts, if there are plans and repair measures, check the dust accumulation, clean them in time, check the lead wires and match Whether the line has damage and aging problems. Test the insulation resistance of the motor windings and record.
In addition to the above items, the annual inspection contents should also be disassembled to perform the core check, clean or clean the grease, and check the insulation.
Small, medium and large repair projects for three-phase asynchronous motors 1. Small repair projects (1) Motor blow cleaning, for general inspection.
(2) Clean the bearings, check and change the oil.
(3) Dealing with local insulation faults of the windings, performing winding binding reinforcement and wrapping lead insulation.
(4) Tighten all the screws.
(5) Adjust the fan and fan cover and reinforce them.
According to our company's experience in the maintenance of ABB motors in the hydropower station of the Cambodian Hydropower Station, the main point of routine maintenance inspection of the motor is to find out the abnormal state of the equipment early and deal with it in time to prevent the accident from expanding. The maintenance personnel can find abnormal phenomena according to the action and signal of the relay protection device, and can also rely on the experience of the maintenance personnel to judge the accident.
1. First of all, the visual inspection can find the following abnormal phenomena: whether the external fastener of the motor is loose, whether the parts are damaged, whether the surface of the equipment is oily or corroded; whether the contact points and joints of the motor are discolored, Burn marks and smoke marks. The reason for these phenomena is due to local overheating of the motor, poor conductor contact or burnt of the windings; If the voltmeter is not indicated or is abnormal, it indicates that the power supply voltage is unbalanced, the fuse is blown, the three-phase resistance of the rotor is unbalanced, single-phase operation, and poor conductor contact. If the ammeter indication is too large, it indicates motor overload, bearing fault, winding turn-to-turn short circuit, etc.; motor stalls, caused by: power failure, single-phase operation, low voltage, too small motor torque, excessive load, voltage Falling too large, bearing burned, mechanically stuck, etc.
2, using the auscultation rod to hear the various noises of the motor, including electromagnetic noise, ventilation noise, mechanical friction sound, bearing noise, etc., so that the cause of the motor failure can be judged. The causes of noise are mechanical: bearing failure, mechanical imbalance, loosening of the fastening screw, non-conformity of the coupling connection, rubbing of the stator core, etc.; electrical: voltage imbalance, single-phase operation, winding There are open circuit or breakdown failures, poor starting performance, and poor acceleration performance.
3, by smell, you can find the cause of burnt smell, odor caused by: motor overheating, winding burnout, single-phase operation, winding faults, bearing failures.
4, by touching the surface of the casing by hand, you can find that the temperature of the motor is too high and the vibration caused by the vibration is caused by unbalanced mechanical load, looseness of each fastening component, insufficient strength of the motor foundation, improper coupling of the coupling, Uneven air gap or mixed debris, voltage imbalance, single-phase operation, winding failure, bearing failure, etc.
The cause of excessive motor temperature is overload, cooling air duct blockage, single-phase operation, turn-to-turn short circuit, high or low voltage, three-phase voltage imbalance, poor acceleration characteristics, long starting time, stator and rotor phases. Bad contact of the wiper, starter, frequent start and brake or reverse brake, excessive inlet air temperature, mechanical jam, etc.
When the temperature of the motor is estimated by hand to estimate the temperature, since each person's feeling is different and subjective, it is determined by experience.
Routine maintenance inspections are divided into daily inspections, monthly or periodic inspections, and annual inspections.
In the daily inspection, the main inspection of the lubrication system, appearance, temperature, noise, vibration and abnormal phenomena, but also check the ventilation cooling system, sliding friction conditions and the fastening of various components, and carefully check the records.
During monthly or regular inspections, check whether the switch, wiring, grounding device, etc. are loose or not, and if there are any damaged parts, if there are plans and repair measures, check the dust accumulation, clean them in time, check the lead wires and match Whether the line has damage and aging problems. Test the insulation resistance of the motor windings and record.
In addition to the above items, the annual inspection contents should also be disassembled to perform the core check, clean or clean the grease, and check the insulation.
Small, medium and large repair projects for three-phase asynchronous motors 1. Small repair projects (1) Motor blow cleaning, for general inspection.
(2) Clean the bearings, check and change the oil.
(3) Dealing with local insulation faults of the windings, performing winding binding reinforcement and wrapping lead insulation.
(4) Tighten all the screws.
(5) Adjust the fan and fan cover and reinforce them.
2. The medium repair project (1) contains all the minor repair items.
(2) Clean and clean the motor, replace the local coil and repair the insulation of the reinforced winding.
(3) Motor disassembly inspection, handling loose coils and wedges, and fastening parts for each part.
(4) The rotor is subjected to dynamic balance test.
3. The overhaul project (1) contains all the contents of the mid-repair project.
(2) The windings are all rewinded and updated.
Category Motor Model Overhaul (Year) Medium Repair (Year) Minor Repair (Year)
Class 1 Y, JB, YSQ, JSQ series and other similar models of motors, continuous operation of small and medium asynchronous motors. 7~10 2 1
Class 2 JRQ, YR, YRQ series and similar models of motors, continuous operation of small and medium winding motor. 10~12 2 1
Class 3 motors that operate repeatedly in a short period of time and frequently start and brake. 3~5 2 0.5
4 types of alternating current flow units, prime movers, rolled steel asynchronous motors and large and medium asynchronous motors. 20～25 4～5 0.5
For the phenomenon of your current motor, it is because the method is wrong when refueling, which leads to a large amount of oil inside the windings. If it is not treated in time, it will have a great impact on the safe operation and service life of the motor. Due to the accumulation of grease, it will affect the heat dissipation of the motor windings and increase the operating temperature of the motor. Grease will also slowly corrode the windings, reducing the insulation performance of the motor windings. As the temperature of the motor winding increases, the internal and external temperatures of the motor rise, which also affects the operating environment of the bearing.
During the use of the motor, the corresponding maintenance and maintenance is very necessary. I hope that your company will pay attention to it. The corresponding treatment method is: disengage the coupling, the cooling fan, open the front and rear end caps of the motor, clean the grease on the front and rear windings of the motor, clean the winding with toluene, and clean the winding and end cap of the motor. After cleaning, it should be aired for one to two hours. After the toluene is evaporated, the motor can be installed. Finally, the coupling is assembled and the test run is started.
The daily maintenance of the bearings of the motor should be carried out in strict accordance with the requirements of the "ABB Motor Instruction Manual".
No maintenance grease failure, resulting in overburning of the stator terminal block of the bearing burnt motor overload, the shaft end load is too heavy, resulting in short shaft, the belt is too tightly adjusted, the tension is too large, the broken crack appears spiral, the stress is too large, the metal fatigue open The motor bearing is damp, resulting in oxidation of the grease, rust on the shaft, sound installation in the open air, large temperature difference between day and night, and the motor is extremely easy to cause "breathing" to draw water vapor into the motor.
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