What inspections should be done on the motor before troubleshooting? Wanbang Motor will teach you how to start:

　　In order to find out the cause of the fault and the approximate scope of the fault, the following inspections should be carried out on the outside of the motor before repairing the mechanical fault of the motor.

　　① Check whether there are cracks in the base and end cover, and whether there are cracks or bending deformation of the rotating shaft.

　　②Check whether the rotor rotates flexibly and smoothly, whether the axial direction is floating, and whether there is any abnormal sound.

　　③Check whether the bearing is loose or stuck.

　　④ Check whether the air duct is blocked, and whether the fan blades and heat sinks are in good condition.

　　⑤For motors with larger capacity, there are generally air gap holes on the end cover. The air gap holes can be used to detect whether the average value of the air gap unevenness is within 15%.

　　⑥Electrically run, and check whether the motor is normal by touching, hearing, nose and eyes.Once an abnormality is found, the power supply should be cut off immediately to prevent the fault from expanding.

　　The motor can be disassembled for further detailed inspection and repair after the inspection has generally determined the nature of the fault and clarified the scope of the repair.

　　For the mechanical parts in the motor, the following inspections should be carried out:

　　① Check for scratches on the surface of stator and rotor cores.When there is only one scratch on the surface of the rotor but all scratches on the surface of the stator are caused by the bending of the shaft or the imbalance of the rotor; when there is only one scratch on the surface of the stator and scratches on the surface of the rotor, it is fixed. The rotor is not concentric, such as the deformation of the base and the end cover or the severe wear of the bearing, which causes the rotor to sink; if the stator and rotor surfaces have large areas of scratches, it is caused by the two reasons mentioned above.

　　②Check whether the stator and rotor cores are aligned.If it is not aligned, it is equivalent to shortening the iron core, and the magnetic flux density increases and the iron core is overheated. The reason is that the rotor core is axially displaced or the replacement of a new rotor is inappropriate.In addition, check whether the stator and rotor cores move in the circumferential direction.If there is any movement, it means that the screws that fasten the stator are loose or damaged or lost, or the rotor core and the shaft are not tightly matched.

　　③Check whether the rotor end ring is cracked or broken, whether the fan blade is damaged or deformed, and whether the rotating shaft is bent.

　　④Check whether the fit between the inner and outer shell of the bearing and the journal and the bearing chamber meets the requirements, whether there is too tight or too loose; check the degree of wear of the bearing, whether the bearing is intact, and whether the lubricating oil (grease) is too little or dry.

　　The above method is for Wanbang Motor, a professional motor service company to provide you with motor solutions.