1. The motor cannot rotate after being energized, but there is no abnormal noise, no peculiar smell and smoke
(1) The cause of the failure
(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 incorrect.
(2) Troubleshooting
(1) Check whether there is a break point at the power circuit switch, fuse and junction box, and repair it;
(2) Check the fuse model, the cause of the fuse, and replace the fuse;
(3) Adjust the setting value of the relay to cooperate with the motor;
(4) Correct the wiring.
2. After powering on, the motor does not rotate and there is a buzzing sound
(1) The cause of the failure
(1) There is an open circuit in the rotor winding (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 contact resistance is large;
(4) The motor is overloaded or the rotor is stuck;
(5) The power supply voltage is too low;
(6) The assembly of the small motor is too tight or the grease in the bearing is too hard;
(7) The bearing is jammed.
(2) Troubleshooting
(1) Identify the breakpoints and repair them;
(2) Check the winding polarity; Judge whether the end of the winding is correct;
(3) Tighten the loose wiring screws, use a multimeter to judge whether the joints are falsely connected, and repair them;
(4) load shedding or detecting and eliminating mechanical faults,
(5) Check whether the specified face connection method is wrong; Whether the voltage drop is too large due to the thin power supply wire, and corrects it;
(6) The new assembly makes it flexible; Replacement of qualified grease;
(7) Repair bearings.
3. It is difficult for the motor to start, and when the rated load is loaded, the speed of the motor is much lower than the rated speed
(1) The cause of the failure
(1) The power supply voltage is too low;
(2) Misconnection of the motor by the face connection method;
(3) The rotor is welded or broken;
(4) The local coil of the rotor is misconnected or reversed;
(3) Excessive increase in the number of turns when repairing the motor winding;
(5) Motor overload.
(2) Troubleshooting
(1) Measure the power supply voltage and try to improve it;
(2) correction of connections;
(3) Check the open welding and broken points and repair them;
(4) Correct the misconnection if it is found;
(5) Restore the correct number of turns;
(6) Load shedding.
4. The no-load current of the motor is unbalanced, and the three-phase difference is large
(1) The cause of the failure
(1) The end of the winding is wrongly connected;
(2) The power supply voltage is unbalanced;
(3) There are faults such as inter-turn short circuit and reverse coil connection in the winding.
(2) Troubleshooting
(1) Inspect and correct;
(2) Measure the power supply voltage and try to eliminate the imbalance;
(3) Eliminate winding faults.
5. When the motor is running, the sound is abnormal and there is abnormal noise
(1) The cause of the failure
(1) The bearing is worn or there are foreign substances such as sand particles in the oil;
(2) The rotor core is loose;
(3) Lack of oil in the bearing;
(4) The power supply voltage is too high or unbalanced.
(2) Troubleshooting
(1) Replace the bearing or clean the bearing;
(2) Overhaul the rotor core;
(3) Refueling;
(4) Check and adjust the power supply voltage.
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