When the motor is in abnormal working conditions (including electrical, mechanical and environmental aspects), the service life of the motor coil will be seriously reduced. The causes of fan coil failure include: lack of phase, short circuit, coil grounding, overload, rotor locking, voltage imbalance and surge. The following are various coil faults. The two-component glue applicator can help you correctly identify the cause of the fault (take the four pole motor as an example).

1.新线圈

1. New coil

2.缺相

2. Phase failure

缺相是指电源中某一相的开路。主要原因是一相熔断器烧断、接触器打开或一相电源线断掉。

Phase loss refers to the open circuit of a phase in the power supply. The main reason is that one phase fuse is burnt out, contactor is opened or one phase power line is broken.

在四极电机缺相烧坏的图片中，电机线圈对称烧坏的意思是缺相烧坏。当缺相导致星形连接烧坏时，2极电机只有2组线圈是好的，4极电机只有4组线圈是好的;如果三角连接缺相烧坏，两极电机的2组线圈和四极电机的4组线圈是好的。

In the picture of phase loss burning out of quadrupole motor, the symmetrical burning out of motor coil means phase loss burning out. When the star connection is burnt out due to phase loss, only two groups of coils are good for 2-pole motor and only four groups of coils are good for 4-pole motor; If the delta connection is out of phase and burned out, two groups of coils of two pole motor and four groups of coils of four pole motor are good.

3.短路

3. Short circuit

电机故障是由污染、磨损、振动等原因引起的。

Motor failure is caused by pollution, wear, vibration and other reasons.

4.线圈接地

4. Coil grounding

电机故障是由污染、磨损、振动等原因引起的。

Motor failure is caused by pollution, wear, vibration and other reasons.

5.过载

5. Overload

电机过载会导致电机过载。

Motor overload will cause motor overload.

6.转子锁定

6. Rotor locking

这种情况会使电机发热很多，有可能是由于电机频繁启动或频繁反转。

This situation will make the motor heat a lot, which may be due to frequent starting or frequent reverse rotation of the motor.

7.三相不均匀电压

7. Three phase uneven voltage

电压不均匀会导致绝缘损坏。原因可能是电源不稳定，电线没有连接好。

Uneven voltage will cause insulation damage. The reason may be that the power supply is unstable and the wires are not connected properly.

注意:1%的电压不平衡将导致6%到10%的电流不平衡。

Note: 1% voltage imbalance will result in 6% to 10% current imbalance.

8.飙升

8. Soaring

一般是由浪涌引起的。电涌可能由电网、雷电、电容器和其他电气设备引起。

It is generally caused by surge. Surges may be caused by the grid, lightning, capacitors and other electrical equipment.