罗茨风机电机烧毁一般情况有以下几种原因：

The motor of Roots blower is burnt out for the following reasons:

一、电机缺相运行

1、 Motor phase loss operation

这是个三相异步电机的杀手，电机正常运行时三相负载为对称负载，因此三相电流基本保持平衡，大小相等，如果运行中电机缺相（三相绕组中任一相断开的现象叫缺相），风机振动将会变大、出现异常声音、转速下降、电流增加，电机温度将会急剧升高，从而导致电机烧坏，质量一般的电机多十几分钟就会烧坏。

This is a killer of three-phase asynchronous motor. During normal operation of the motor, the three-phase load is symmetrical load, so the three-phase current is basically balanced and equal. If the motor lacks phase during operation (the phenomenon of disconnection of any phase in the three-phase winding is called phase loss), the fan vibration will increase, abnormal sound will appear, the speed will decrease, the current will increase, and the motor temperature will rise sharply, As a result, the motor will burn out, and the motor with average quality will burn out in more than ten minutes.

可怕的是整个供电系统的缺相，再加上很多设备的开关是自锁的或自动开启的（如风机、水泵），一次停电后的再送电缺相事故，可能一下烧十几个电机。

The terrible thing is the lack of phase in the whole power supply system. In addition, the switches of many equipment are self-locking or automatically turned on (such as fans and pumps). The lack of phase in power transmission after a power failure may burn more than a dozen motors at once.

二、轴承损坏。

2、 The bearing is damaged.

由于长时间不间断的让罗茨风机运行致使由于电机本体运行温升过高，且轴承补充加油脂不及时造成轴承缺油直至轴承损坏、会出现轴弯曲、皮带断裂等现象，致使定、转子摩擦（俗称扫膛）引起铁心温度急剧上升，烧毁槽绝缘、匝间绝缘，从面造成绕组匝间短路或对地"放炮".严重时会使定子铁心倒槽、错位、转轴磨损、端盖报废等。轴承损坏一般还有下列原因造成：

Due to the continuous operation of Roots blower for a long time, the temperature rise of motor body is too high, and the bearing is not supplemented with grease in time, resulting in bearing oil shortage until the bearing is damaged, shaft bending, belt fracture and other phenomena, resulting in the sharp rise of iron core temperature caused by stator and rotor friction (commonly known as bore sweeping) and the burning of slot insulation and turn to turn insulation, Cause winding turn to turn short circuit or "shooting" to the ground from the surface. In serious cases, the stator core will be inverted, misplaced, the rotating shaft will be worn, the end cover will be scrapped, etc. Bearing damage is generally caused by the following reasons:

1、轴承装配不当，如冷装时不均匀敲击轴承内圈使轴受到磨损，导致轴承内圈与外圈配合失去过盈量或过盈量变小，出现跑内圈现象，装电机端盖时不均匀敲击，导致端盖轴承室与轴外圈配合过松出现跑外圈现象。无论跑内圈还是跑跑外圈均会引起轴承运行温升急剧上升，只要轴承完好，允许间断性跑外圈现象存在。

1. Improper bearing assembly, such as uneven knocking on the bearing inner ring during cold assembly, resulting in shaft wear, resulting in loss of interference or smaller interference between the bearing inner ring and the outer ring, resulting in inner ring running. Uneven knocking during motor end cover installation, resulting in loose fit between the end cover bearing chamber and the shaft outer ring, resulting in outer ring running. Running either the inner ring or the outer ring will cause a sharp rise in the operating temperature of the bearing. As long as the bearing is intact, intermittent running of the outer ring is allowed.

2、轴承承墙内未清洗干净，或加油脂不干净。例如轴承保持微小钢性物质为彻 底清理干净，运行是轴承滚到受损引起温升过高烧毁轴承。

2. The bearing wall is not cleaned or the grease is not clean. For example, the bearing keeps tiny rigid substances. In order to clean them thoroughly, the operation is that the bearing rolls to damage, resulting in too high temperature rise and burning the bearing.

3、轴承重新更换加工，电机端盖嵌套后过盈量大或椭圆度超标引起轴承滚珠游隙过小或不均匀导致轴承运行时摩擦力增加，温度急剧上升直至烧毁。

3. The bearing is replaced and processed again. After the motor end cover is nested, the interference is large or the ovality exceeds the standard, resulting in too small or uneven bearing ball clearance, resulting in increased friction during bearing operation, and the temperature rises sharply until it is burned.

4、由于定、转子铁心轴向错位或重新对转轴机加工后精度不够，致使轴承内、外圈不在一个切面上而引起轴承运行"吃别劲"后温升高直至烧毁。

4. Due to the axial dislocation of stator and rotor cores or insufficient accuracy after re machining the rotating shaft, the inner and outer rings of the bearing are not on the same section, resulting in the temperature rise after the bearing runs "hard" until it is burned.

5、由于不同型号的油脂混用造成轴承损坏。

5. The bearing is damaged due to the mixed use of different types of grease.

6、轴承本身存在质量问题，例如滚道锈斑、转动不灵活、游隙过小、保持架变形等。

6. The bearing itself has quality problems, such as rust on the raceway, inflexible rotation, too small clearance, cage deformation, etc.

7、备用机长期不运行，油脂变质，轴承生锈而唯有对其保养和维护只能使用中注意定期检查和定期更换相同品牌油脂。

7. The standby machine does not operate for a long time, the grease is deteriorated and the bearing is rusty. Only its maintenance can be carried out. Pay attention to regular inspection and regular replacement of grease of the same brand during use.

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