当电机处于非正常工况(包括电气、机械和环境方面)时，电机线圈的寿命会严重降低。风机盘管故障的原因有:缺相、短路、盘管接地、过载、转子闭锁、电压不平衡、浪涌。下面是各种线圈故障，双组份打胶机可以帮助您正确识别故障原因(以四极电机为例)。
When the motor is in abnormal conditions (including electrical, mechanical and environmental aspects), the life of the motor coil will be seriously reduced. The causes of fan coil unit failure are: lack of phase, short circuit, coil grounding, overload, rotor locking, voltage imbalance, surge. The following is a variety of coil faults, two-component glue machine can help you correctly identify the cause of the fault (take quadrupole motor as an example).
1.新线圈
1. New coil
2.缺相
2. Phase loss
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。
Open phase 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 four pole motor with missing phase and burning out, the symmetrical burning out of motor coil means missing phase and burning out. When the star connection is burnt out due to phase loss, only two groups of coils of 2-pole motor are good, and only four groups of coils of 4-pole motor are good; If the delta connection is burned out, the two coils of two pole motor and the four 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, may be due to frequent motor start or frequent reversal.
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 can cause insulation damage. The reason may be that the power supply is unstable and the wires are not well connected.
注意:1%的电压不平衡将导致6%到10%的电流不平衡。
Note: a 1% voltage imbalance will result in a 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 usually caused by surge. Surge may be caused by power grid, lightning, capacitors and other electrical equipment.