1. The motor cannot roll after being energized, but there is no abnormal noise, no peculiar smell and smoke.
1. Cause of the problem: (1) The power supply is not connected (at least two phases are not connected); (2) Fuse blowing (at least two-phase blowing); (3) The overcurrent relay is adjusted too small; (4) The wiring of the control equipment is faulty.
2. Problem cleaning (1) Check whether there is a break point at the power circuit switch, fuse and junction box, and correct; (2) Check the fuse model, the cause of the fuse, and replace the fuse; (3) The setting value of the conditioning relay cooperates with the motor; (4) Correct the wiring.
Second, the motor does not rotate after the power is on, and then the fuse is blown out
1. Cause of the problem (1) Lack of one-phase power supply, or the fixed trunk coil is connected in the opposite direction; (2) Phase-to-phase short circuit of stator winding; (3) Grounding of stator winding; (4) The wiring of the stator winding is faulty; (5) The cross-section of the fuse is too small; (5) The power cord is short-circuited or grounded.
2. Problem cleaning (1) Check whether the knife switch has a phase that is not closed, but there is a phase disconnection in the power circuit; Eliminate the problem of reverse connection; (2) Detect the short circuit point and correct it; (3) Eliminate grounding; (4) Detect and correct misconnections; (5) Replace the fuse; (3) Eliminate the address.
3. After powering on, the motor does not rotate and there is a buzzing sound
l. Cause of the problem: (1) There is an open circuit in the stator and rotor windings (one-phase disconnection) or one-phase power loss of the power supply; (2) The beginning and end of the winding lead wire are connected incorrectly or the winding is reversed; (3) The contact of the power supply circuit is loose and the touch resistance is large; (4) The motor is overloaded or the rotor is stuck; (5) The power supply voltage is too low; (6) The small motor is installed too tightly or the grease in the bearing is too hard; (7) The bearing is jammed.
2. Problem removal: (1) Identify and correct the breakpoints; (2) Check the winding polarity; Determine whether the end of the winding is correct; (3) Tighten the loose wiring screws, use a multimeter to determine whether the joints are falsely connected, and correct them; (4) load shedding or detecting and eliminating mechanical problems, (5) checking is also misconnecting the surface connection method of the rule to Y; Whether the voltage drop is too large because the power supply wire is too thin, to be corrected, (6) install it from scratch to make it flexible; Replacement of qualified greases; (7) Correct the bearing.
Fourth, the motor is difficult to start, and when the additional load is loaded, the motor speed is much lower than the extra speed
1. Cause of the problem: (1) The power supply voltage is too low; (2) The surface connection method motor is mistakenly connected to Y; (3) Welding or cracking of cage rotor; (4) The local coil of the stator and rotor is misconnected and reversed; (3) Excessive number of turns added when correcting the motor winding; (5) Motor overload.
2. Problem elimination: (1) Measure the power supply voltage and try to improve it; (2) correction of connections; (3) Check the open welding and breaking points and correct them; (4) Detect the misconnection and correct it; (5) the correct number of turns of rehabilitation; (6) Load shedding.
Fifth, the no-load current of the motor is unbalanced, and the three-phase difference is large
1. Cause of the problem: (1) When rewinding, the number of turns of the stator three-phase winding is not equal; (2) The end of the winding is wrongly connected; (3) The power supply voltage is unbalanced; (4) There are problems such as inter-turn short circuit and reverse coil connection in the winding.
2. Problem Sweeping: (1) Winding the sub-winding from the beginning; (2) review and correct; (3) Measure the power supply voltage and try to eliminate the imbalance; (4) Eliminate the winding problem.
6. When the motor is unloaded and overloaded, the ammeter pointer is unstable and swings
1. Cause of the problem: (1) The cage rotor guide bar is welded or broken; (2) Winding rotor problem (one-phase open circuit) or poor touch of brush and collector ring short-circuit device.
2. Problem cleaning: (1) Detect the broken bar and correct it or replace the rotor; (2) Check the winding rotor circuit and correct it.
7. The no-load current of the motor is balanced, but the value is large
1. Cause of the problem (1) When correcting, the number of turns of the stator winding is reduced too much; (2) The power supply voltage is too high; (3) Y is connected to the motor by mistake for Δ; (4) During the installation of the motor, the rotor is reversed, so that the stator core is not aligned and the effective length is shortened; (5) The air gap is too large or uneven; (6) When overhauling and removing the old winding, the thermal dismantling method is improper, which causes the core to burn out.
2. Problem cleaning (1) Rewind the stator winding and restore the correct number of turns; (2) try to recover the additional voltage; (3) Reconnect to Y; (4) Installation from scratch; (3) Replace the new rotor or adjust the air gap; (5) Overhaul the core or calculate the winding from scratch, and add the number of turns appropriately.
8. When the motor is running, the sound is abnormal and there is abnormal noise
1. Cause of the problem: (1) The rotor rubs with the stator insulating paper or groove wedge; (2) The bearing is worn or there are foreign substances such as sand particles in the oil; (3) The stator and rotor core is loose; (4) Lack of oil in the bearing; (5) Air duct tamponade or electric fan wiping the hood, (6) stator and rotor cores rubbing each other; (7) The power supply voltage is too high or unbalanced; (8) The stator winding is misconnected or short-circuited.
2. Problem cleaning: (1) trim the insulation and cut the groove wedge; (2) Replace bearings or clean bearings; (3) Overhaul stator and rotor cores; (4) Refueling; (5) Finishing the air duct; de novo installation device; (6) Eliminate scratches, small rotors in the car if necessary; (7) Check and adjust the power supply voltage; (8) Eliminate the problem of stator winding.
9. The motor oscillates greatly during operation
1. Cause of the problem: (1) Because the gap of the wear bearing is too large; (2) uneven air gap; (3) Rotor imbalance; (4) Twists and turns of the shaft; (5) The core is deformed or loosened; (6) The center of the coupling (pulley) is not calibrated; (7) The fan is unbalanced; (8) Strength of the casing or foundation
No way; (9) The anchor screw of the motor is loose; (10) Cage rotor open welding and open circuit; Wound rotor break; Plus stator winding problem.
2. Problem cleaning (1) Overhaul the bearing, replace if necessary; (2) Adjust the air gap to make it uniform; (3) Calibrate the dynamic balance of the rotor; (4) Straighten the rotating shaft; (5) Proofread the overlapping core, (6) Proofread from scratch to make it conform to the rules; (7) Overhaul the fan, calibrate the balance, and correct its geometry; (8) Carry out reinforcement; (9) Fastening anchor screws; (10) Modify the rotor winding; Fix the stator windings.
10. The bearing is overheated
1. Cause of the problem: (1) Too much or too little grease; (2) The oil quality is not good, and it contains impurities; (3) The bearing is not properly cooperated with the journal or end cover (too loose or too tight); (4) The inner bore of the bearing is painful and rubs with the shaft; (5) The motor end cover or bearing cover is not flattened; (6) The coupling between the motor and the load is not calibrated, or the belt is too tight; (7) The bearing clearance is too large or too small; (8) The motor shaft is tortuous.
2. Problem cleaning (1) add smooth grease (1/3-2/3 of the volume) according to the rules; (2) Replace the clean smooth grease; (3) If it is too loose, it can be corrected with a binder, and if it is too tight, it should be turned tightly, and the inner hole of the shaft journal or end cover should be ground to make it suitable; (4) Repair the bearing cover and eliminate the friction point; (5) Installation from scratch; (6) Proofread from scratch and adjust the belt tension; (7) Replace the new bearing; (8) Calibrate the motor shaft or replace the rotor.
11. The motor is overheated or even smoked
1. Cause of the problem (1) The power supply voltage is too high, which greatly increases the heating of the core; (2) The power supply voltage is too low, the motor is running with additional load, and the current is too hot to heat the winding; (3) When repairing and removing the winding, the hot dismantling method is not appropriate, and the iron core is burned; (4) The stator and rotor cores rub against each other; (5) The motor is overloaded or starts frequently; (6) Cage rotor broken strip; (7) The motor lacks phase and runs in two phases; (8) After rewinding, the winding impregnation paint is insufficient; (9) The ambient temperature is high, and there is a lot of dirt on the surface of the motor, or the ventilation duct is blocked; (10) Electric fan problem, poor ventilation; Stator winding problems (interphase, turn-to-turn short circuits; The internal connection of the stator winding is faulty).
2. Problem elimination (1) reduce the power supply voltage (such as adjusting the tap of the power supply transformer), if it is caused by the fault of the motor Y and Δ connection, the connection method should be corrected; (2) Increase the power supply voltage or change the thick power supply wire; (3) Overhaul the iron core and clean up the problem; (4) Eliminate friction points (adjust air gaps or frustrations, car rotors); (5) load shedding; Operate the start according to the regular number of times; (6) Check and eliminate rotor winding problems; (7) Rehabilitation three-phase operation; (8) The secondary dipping and vacuum dipping process are selected; (9) Clean the motor, improve the ambient temperature, and choose the cooling method; (10) Check and correct the fan, and replace it if necessary; Overhaul the stator windings to eliminate problems.
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