Chengdu Roots Blower Factory: Why Are Roots Blower Motors Often Damaged?

　Chengdu Roots Blower FactoryIntroduce why the Roots blower motor is often damaged

Recently, there was an inquiry from netizens on the Internet, saying that 90KW three-phase asynchronous motor should be used to drive Roots blower made by a blower factory, showing the safety accident of burning two motors within 2 days. Like this Roots blower often burned what is the situation? The following, enumerate the Roots blower motor burned these may be several reasons:

1. motor phase loss operation

This is also the killer of three-phase asynchronous motors. When the motor runs normally, the three-phase load is symmetrical load, so the three-phase current is basically persistently balanced and of similar size. If the motor is short of phase during operation (the case where any phase in the three-phase winding is broken is called phase failure), the centrifugal fan oscillation may increase, abnormal sound may appear, speed ratio is reduced, current flow is added, and the motor temperature may rise greatly, which may cause the motor to burn down, the quality of the general motor more than ten minutes will burn.

2. rolling bearing destruction

Because of the long-term uninterrupted operation of Roots blower, the operating temperature of the motor itself is too high, and the rolling bearing is not filled with vegetable grease, which leads to the phenomenon of less rolling bearing oil until the rolling bearing is destroyed, the shaft is bumpy and the transmission belt is cracked, resulting in the contradiction between the stator and the motor rotor (alias stuck cylinder), resulting in a sharp rise in the ambient temperature of the iron core, burning of slot insulation and inter-turn insulation, from the surface to cause winding resistance phase short circuit or voltage to ground "fire". When it is obvious, the stator core will be inverted, displaced, the drive shaft will be damaged, and the bearing end cover will be abolished.
 

3. the electric air valve is closed, the load will be burned.

Since the electric air valve is not opened or opened after the Roots blower is started, the usage is not good. However, when the centrifugal fan is running here, the ambient temperature of the Roots blower motor itself rises sharply until the air outlet is burned or the electric air valve is calibrated, while the centrifugal fan fails to be closed in time. When the centrifugal fan is running here, the ambient temperature of the motor itself rises sharply until it is burned. If the maintenance function is normal (refitting the appropriate heat relay), it will not be caused in general. However, it should be noted that because the thermal relay cannot be calibrated and the maintenance standard value is not very accurate, the model selection is not suitable for these and human factors are set to be actively calibrated, so when maintenance is required, the actual effect is usually not achieved, and it is also possible that frequent maintenance will not be possible in the future, the real root cause cannot be found, and human factors will increase the maintenance standard value. To make the maintenance invalid.

4. return to moisture

Due to the distribution box or motor water or moisture caused by the formation of the insulation layer is reduced, is also a common cause of destruction, but there is no way for safety protection. Only shakes insulation in the application attention and on time. Before the motor does not explode, it can be treated by drying and dripping paint from scratch. In particular, if the frequency converter is used to drive the motor, one should be more cautious about this item, otherwise I'm afraid even the frequency converter will be reimbursed.

5. Other

Other reasons are not more common: such as low or too high voltage, vibration-induced wiring head loose interphase short circuit, rodent hazard, imported motor voltage and domestic working voltage refused to communicate. A variety of relief pressure start control loop problems do not change, Roots blower motor long-term low voltage operation, etc. Therefore, the accident rate can be reduced by paying attention to the prior inquiry of various overall objectives before use.

　　Chengdu Roots Blower Factory: Well, that's all for today. If you need to purchase fans, please contact our Chengdu Roots Blower Factory.