Motor Common Fault Analysis
In industrial and agricultural production, various production machines are widely used to drive the motor. The motor may malfunction during operation due to various reasons. When a fault occurs, it may cause the motor to overheat or damage. Therefore, when the motor is running, it should pay close attention. All kinds of fault phenomena, timely detection, timely processing, to ensure the normal operation of the motor. In the actual operation, the motor common failures are mainly the following: 1. The motor can not start The reason the motor can not be started is mainly due to the power is not connected, the load is too large, the rotation is blocked, the fuse is blown, etc. Circuit or additional electrical components, mainly to ensure that the circuit switch is intact, the wiring is correct, there is no reverse connection, short circuit phenomenon. Secondly, check the load and the mechanical part to determine whether the bearing is damaged, whether it is driven by the machine and whether the gap between the stator and the rotor is abnormal, so that the stator and the rotor collide. 2. The motor housing is energized. The motor housing is energized because the motor grounding wire is disconnected or loose. The lead-out wire is in contact with the junction box or the terminal board due to too much grease. The treatment method is to check and connect the ground wire, check the junction box, and clean the wiring board. 3. Motor overheating Motor overheating can occur when the motor is overloaded, lacks phase operation, and motor air ducts are blocked. When the motor is overloaded, the current will increase, causing the motor to overheat and may burn the motor. In this case, adjust the load in time to avoid long-term overload operation of the motor. If only one phase of the three-phase power supply is disconnected, it will cause the motor to run out of phase. If the phase loss operation is too long, it will burn out the motor. So always check the power circuit. There are too many sludges and dusts in the motor. The blockage of the ventilation ducts of the motor will affect the cooling effect and cause the motor to overheat. Therefore, the obstructions must be removed in time to improve the heat dissipation conditions. 4. Abnormal operation sound of the motor When the motor is operating normally, the sound is uniform and noiseless. When the bearing is damaged or lacks phase operation phenomenon, abnormal or even harsh sounds will be emitted. Bearing damage is mainly due to excessive bearing clearance or serious wear. It is caused by lack of lubricant or improper oil selection. At this time, it is necessary to clean or replace the bearing in time to ensure that the motor has good lubrication during operation. After the general motor runs for about 5000 hours, , should add or replace grease. Phase motor is running, the speed will drop, and an abnormal sound, if you run too long, it will burn out the motor. Without phase power circuit is mainly caused by a problem such as a power cable phase wire, or a motor having a phase winding disconnected. In order to prevent the motor from running out of phase, it is necessary to pay attention to the discovery of anomalous operation of the missing phase and remove it in time, and then install the phase loss protection for the important motor. The abnormal running sound of the motor may also be caused by the fan blade hitting the wind shield, and the wind shield must be repaired in time. In short, during the actual operation of the motor, the environment should be kept dry, and the surface of the motor should be kept clean. The motor must be operated under the voltage, frequency, and current marked on the nameplate. The motor must also have sufficient protection systems during the operation, such as overloading. Lack of equals. In order to ensure the normal operation of the motor.
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