2. 1, the motor can't rotate after power-on, but there is no abnormal sound, odor and smoke.

2. 1. 1 Cause of failure: ① Power failure (at least two-phase failure); (2) Fuses are blown (at least two phases are blown); ③ The overcurrent relay is too small; (4) The wiring of the control equipment is wrong; Wait a minute.

2. 1.2 Troubleshooting: ① Check whether there are breakpoints in the switches, fuses and junction boxes of the power supply circuit and repair them; (2) Check the fuse model and fuse reason, and replace it with a new fuse; ③ Adjust relay setting value to cooperate with motor; ④ Correct the wiring.

2.2, the motor does not turn after power-on, and then the fuse blows.

2.2. 1 Cause of failure: ① One-phase power supply is missing, or one stator coil is connected reversely; ② Short circuit between stator windings; ③ Stator winding grounding; (4) Wrong connection of stator winding; ⑤ The fuse section is too small; Wait a minute.

2.2.2 Troubleshooting: ① Check whether one phase circuit breaker is not closed or the power supply circuit is disconnected; Eliminate the reverse connection fault; (2) Find out the short circuit point and repair it; ③ Eliminate grounding; (4) Find out the wrong connection and correct it; ⑤ Replace the fuse;

2.3. There is no hum when the motor is started.

2.3. 1 Cause of failure: ① Stator and rotor windings are open (one phase is open) or power supply is cut off in one phase; (2) The lead-out wires of the winding are wrongly connected at the beginning and the end, or the winding is internally connected reversely; (3) The contact of power supply circuit is loose, and the contact resistance increases; (4) The motor is overloaded or the rotor is stuck; ⑤ The power supply voltage is too low; ⑥ The small motor is assembled too tightly or there is too much grease in the bearing; ⑦ The bearing is stuck; Wait a minute.

2.3.2 Troubleshooting: ① Find the breakpoint and repair it; ② Check winding polarity; Jud whether that end of win is correct; (3) Tighten the loose wiring screws, judge whether each joint is false with a multimeter and repair it; (4) Load rejection or finding out and eliminating mechanical failure; (5) Check whether the specified delta is connected to y by mistake; Whether the voltage drop is too large due to the thin power conductor, correct it, 6 reassemble it to make it flexible; Replace qualified grease; ⑦ Repair the bearing.

2.4, the motor is difficult to start, rated load, the motor speed is lower than the rated speed.

2.4. 1 Cause of failure: ① The power supply voltage is too low; ② △ Motor misconnection is y; ③ Cage rotor is welded or broken; ④ The local coils of stator and rotor are connected by mistake or reverse; ③ Too many turns are added when repairing the motor winding; ⑤ Motor overload; Wait a minute.

2.4.2 Troubleshooting: ① Measure the power supply voltage and try to improve it; ② Correct connection; (3) Check welding and breakpoints and repair them; (4) Find out the mistakes and correct them; ⑤ Restore the correct number of laps; ⑥ Reduce the load.

2.5, motor no-load current imbalance, three-phase difference is big.

3.5. 1 Cause of failure: ① When rewinding, the number of turns of the stator three-phase winding is unequal; (2) The winding ends are wrongly connected; ③ unbalanced power supply voltage; ④ Faults such as turn-to-turn short circuit and coil reverse connection exist in the winding; Wait a minute.

3.5.2 Troubleshooting: ① Rewinding the stator winding; ② Check and correct; (3) measure the power supply voltage, try to eliminate the imbalance; (4) suddenly eliminate the winding fault.

2.6, motor no-load, overload, ammeter pointer instability, swing.

3.6. 1 Cause of failure: ① open welding or broken bar of cage rotor bar; ② Winding rotor fault (one-phase open circuit) or poor contact between brush and collector ring short circuit device; Wait a minute.

3.6.2 Troubleshooting: ① Find out the broken bars and repair or replace the rotor; ② Check the circuit around the rotor and repair it.

2.7, motor no-load current balance, but the value is large.

3.7. 1 Cause of failure: ① The number of turns of stator winding is reduced too much during repair; ② The power supply voltage is too high; ③Y-connected motor is mistakenly connected with δ; (4) When the motor is assembled, the rotor is installed backwards, so that the stator core is dislocated and the effective length is shortened; ⑤ The air gap is too large or uneven; ⑥ When the old winding is dismantled in overhaul, the iron core is burnt out due to improper hot dismantling method; Wait a minute.

2.7.2 Troubleshooting: ① Rewind the stator winding to restore the correct number of turns; ② Try to restore the rated voltage; Change 3 to y; ④ reassembly; ③ Replace the rotor with a new one or adjust the air gap; ⑤ Repair the iron core or recalculate the winding, and appropriately increase the number of turns.

2.8, the motor running noise is not normal, there is abnormal sound.

3.8. 1 Cause of failure: ① Friction between rotor and stator insulation paper or slot wedge; (2) Bearing wear or sand and other foreign bodies in oil; ③ The stator and rotor cores are loose; ④ The bearing is short of oil; ⑤ Air duct stuffing or fan cover wiping, ⑤ stator and rotor iron cores rubbing against each other; ⑦ The power supply voltage is too high or unbalanced; ⑧ Wrong or short-circuited stator winding; Wait a minute.

3.8.2 Troubleshooting: ① Repair insulation and reduce slot wedge; ② Replace the bearing or clean the bearing; ③ Overhaul the stator and rotor cores; 4 come on; ⑤ Clean the air duct; Reinstall; 6. Eliminate scratches, and if necessary, install the small rotor on the car; ⑦ Check and adjust the power supply voltage; ⑧ Troubleshooting the stator winding.

2.9. The motor vibrates greatly during operation.

3.9. 1 Cause of failure: ① bearing clearance is too large due to wear; ② uneven air gap; ③ rotor imbalance; (4) the rotating shaft is bent; (5) Deformation or looseness of iron core; ⑥ The center of coupling (pulley) is not corrected; ⑦ The fan is unbalanced; End casing or foundation strength is not enough; Pet-name ruby motor anchor screw loose; Attending open welding circuit of cage rotor; Open circuit of winding rotor; Increase stator winding fault; Wait a minute.

3.9.2 Troubleshooting: ① Repair the bearing and replace it if necessary; ② Adjust the air gap to make it uniform; ③ Correcting rotor dynamic balance; ④ Straighten the rotating shaft; ⑤ Correct overlapping iron cores, ⑤ Re-correct them to make them conform to regulations; ⑦ Repair the fan, correct the balance and its geometry; 8 reinforcement; Pet-name ruby fastening anchor screw.

2. 10, bearing overheating

3. 10. 1 Cause of failure: ① Too much or too little grease; ② The oil quality is not good and contains impurities; ③ Improper cooperation between bearing and journal or end cover (too loose or too tight); (4) eccentric bearing hole, friction with the shaft; ⑤ The motor end cover or bearing cover is installed unevenly; ⑥ The coupling between motor and load is not corrected, or the belt is too tight; ⑦ bearing clearance is too large or too small; 8 motor shaft bending; Wait a minute.

2. 10.2 Troubleshooting: ① Add grease (1/3-2/3 by volume) as required; ② Replace clean grease; (3) Too loose can be repaired with glue, too tight should be turned, and the inner hole of the journal or end cover should be polished to make it match; (4) Repair the bearing cover and eliminate friction points; (5) reassembly; ⑥ Recalibrate and adjust the belt tension; ⑦ Replace new bearings; Finally correct the motor shaft or replace the rotor.

2. 1 1, the motor is overheated or even smokes.

2. 1 1. 1 Cause of failure: ① The power supply voltage is too high, which greatly increases the core heating; (2) The power supply voltage is too low, the motor runs with rated load, and the current is too large to heat the winding; (3) When repairing and disassembling the winding, improper thermal disassembly method is adopted to burn out the iron core; (4) The stator and rotor iron core rub together; ⑤ Motor is overloaded or frequently started; ⑥ Broken bars of cage rotor; ⑦ The motor lacks phase and operates in two phases; ⑧ After rewinding, the winding is not completely dipped in paint; Pet-name ruby high ambient temperature motor surface dirty, or ventilation is blocked; Wait a minute.

2. 1 1.2 Troubleshooting: ① Reduce the power supply voltage (such as adjusting the tap of the power transformer), and correct the wiring if it is caused by the wrong wiring of motors Y and δ; (2) increase the power supply voltage or replace the thick power cord; (3) iron core maintenance and troubleshooting; (4) Eliminating rubbing points (adjusting air gap or rotating rotor); ⑤ Load rejection; Control startup according to the specified number of times; ⑥ Check and eliminate rotor winding faults; ⑦ Restore three-phase operation; (8) adopting secondary paint dipping and vacuum paint dipping processes; Pet-name ruby clean motor, improve the ambient temperature, take cooling measures.