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Analyze the cause of frequent burning of Roots blower motor _ three leaf Roots blower

Source: Roots blower manufacturer Published on: December 9, 2021-12 Hits:

Generally, we have sound insulation equipment for three leaf Roots blower. In summer, we open the soundproof military door. The sound insulation force forms a limited space, which increases the ambient temperature, which results in the high temperature of the inhaled air and the high outlet temperature. The inlet temperature of many Roots blowers with sound insulation covers exceeds 45 ℃ in summer. If the fan is installed indoors. Conditional air conditioners can be installed. Don't worry about air conditioning and electricity. As the motor temperature rises by 10 degrees, the expected life is much lower. Therefore, indoor air conditioning can extend the service life of equipment and reduce the outlet temperature. Reducing the inlet and outlet pressure can help us reduce the temperature.

1、 Motor phase failure operation

This is the killer of three-phase asynchronous motor. When the motor operates normally, the three-phase load is symmetrical load, so the three-phase current is basically balanced and the size is equal. If the motor is in phase loss during operation (the phenomenon that any phase in the three-phase winding is disconnected is called phase loss), the fan vibration will become larger, abnormal noise will appear, the speed will drop, the current will increase, and the motor temperature will rise sharply, As a result, the motor will burn out. An ordinary motor will burn out in ten minutes at most.

2、 Bearing damage

As the Roots blower operates continuously for a long time, the temperature rise of the motor body is too high, and the bearing is not filled with grease in time, resulting in bearing oil shortage until bearing damage, shaft bending, belt fracture and other phenomena, resulting in stator and rotor friction (commonly known as bore cleaning), resulting in a sharp rise in core temperature, burning groove insulation, turn to turn insulation, The winding turns are short circuited or "shot" to the ground is caused from the surface. In serious cases, the stator core will be inverted, misaligned, the shaft will be worn, and the end cover will be scrapped.

3、 Overload burning will be caused when the air valve is closed

Causes of Frequent Burning of Roots Blower Motor

Since the air valve of Roots blower has not been opened or has not been opened enough after starting. When the fan operates under this condition, the operating temperature of Roots blower motor will rise sharply until the air outlet is burned or the air valve is reset, but the fan is not closed in time. When the fan operates under this condition, the operating temperature of the motor will also rise sharply until it is burned. If the protection function is normal (add appropriate thermal relay), it will not happen generally. However, it should be noted that because the thermal relay cannot be verified, the protection value is not very accurate, the model selection is not appropriate, and the manual setting is automatic reset, when protection is needed, it often does not work, or it may be that after several times of protection, the real reason is not found, and the protection value is manually adjusted higher. To disable the protection.

4、 Be affected with damp

The insulation reduction caused by water ingress or moisture of the distribution cabinet or motor is also a common cause of damage, but there is no way to protect it. Only pay attention to and shake the insulation regularly during use. Before the motor explodes, it can be solved by drying and re dipping. Especially for the motor driven by frequency converter, be more careful about this item, otherwise it may be reimbursed together with the frequency converter.

5、 Others

In addition, there are not very common reasons: for example, the voltage is too low or too high, the vibration causes the terminal to be loose and short circuit between phases, pests and rats, and the voltage of imported motors does not match the domestic voltage. The failure of various decompression starting circuits causes no conversion, and the Roots blower motor works at low voltage for a long time. Therefore, the accident rate can be reduced by checking all indicators before use and then starting.

Text label: Roots blower

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