Three-phase AC motors of a common fault, has swept bore firearms, vibration, bearing overheating, damage and other faults.
1, induction motor stator and rotor air gap between the small, easily lead to stator and rotor between the collide.
2, vibration motor itself should first distinguish between induced or caused by poor transmission, or mechanical load transfer over, and then exclude specific situation.
3, if the bearing does not work correctly, can use their experience with the hearing and to determine the temperature. Second, there are voltage electrical grounding abnormal winding winding winding short circuit missing running, etc..
1, high voltage, exciting current increases, the motor will over heat, over-the crisis of high voltage electrical insulation, so there is the risk of breakdown. Supply voltage is too low, the electromagnetic torque will be greatly reduced, if not reduce the load torque, low rotor rpm, when the slip increases while the heat caused by electrical overload, time will affect the motor life.
2, the motor winding insulation damage, and the winding of the conductor and core, chassis ground between the windings shall collide. Then lead to the phase winding current is too large, local heat, and in severe burnt windings.
3, winding insulation between adjacent wires, damaged, so that the two touching one conductor, called winding short circuit. In the same winding in the winding circuit as turn to turn short circuit. Two-phase winding in short circuit between the windings is called phase short circuit. No matter what kind, would give rise to a phase or two-phase current increases, causing localized heating, so that damage to motor insulation aging.
4, motor winding circuit is touching the stator or rotor winding failure caused by broken or blown.
5, the Department of Motor running three different process, off a FireWire or broken will form a winding phase Operation (commonly known as single-phase), if the axis of the load has not changed, the motor overload is a serious condition, the stator current will twice to reach even higher rating, time, electric motor will burn longer.
6, motor grounding. To sum up, in order to use the correct method for motor fault repair, the motor must be familiar with the characteristics and causes of common faults to avoid detours, save time, as soon as possible to troubleshoot and restore motor failure, the motor is in normal operating condition. Do regular inspection and maintenance of motor work, but also ensure the safe operation of motor to extend the effective life of one of the measures.