Analysis of common problems in the operation of automatic motor stator coil winding machines?

As the saying goes, “mechanical equipment is afraid of stopping, electrical equipment is afraid of opening”, and this is also true in actual production. In general, the winding machine does not start, can be found in several ways, such as wiring errors, voltage does not meet the requirements of the motor nameplate, protection device tripping, starting equipment problems, coil winding machine and automatic winding machine group failure, as well as starting load.

Restarting the product after a normal shutdown during production. Often, motors do not start properly due to wiring errors and are usually prone to wiring errors when rewired after a new installation or overhaul of a wire-wound motor. The wiring errors mentioned here are mainly between the motor side current transformer and the distribution cabinet with differential protection function. If this happens during the actual wiring process, the motor will trip when starting due to a differential fault reported by the protection device. Therefore, when connecting the transformer on the motor side and the transformer on the distribution cabinet side, special attention should be paid to the fact that the two transformers installed in different locations detect the same current as the phase winding of the motor and the same phase can be connected to the motor protection device as differential protection.

Winding machines are medium and high voltage electrical equipment. In practice, the equipment cannot be turned on due to voltage problems. Unless more than one device is turned on at the same time, the supply voltage is greatly reduced and cannot be turned on properly.

Tripping of the protective device is the Z common and Z important reason why the winding machine does not turn on properly.

Tripping of protection devices during start-up is usually due to overcurrent protection and differential protection. There are three reasons for overcurrent protection: (1) The overcurrent protection value of the protection device is not set properly. (2) Excessive load or mechanical connection failure. (3) The winding machine itself or the starting device is faulty.

When the winding machine in the process of starting due to overcurrent and cause the protection device tripping signal, should first check whether the overcurrent protection value setting is reasonable. Generally speaking, the starting current of the winding machine is 3 to 5 times the rated current, and the protection device sets the motor current protection setting to current fast protection and overcurrent protection. During motor start-up, the current high speed high value plays a major role in the protection. Therefore, it is only necessary to check whether the high speed value is too low. If it is less than 5 times the rated current, it can be amplified appropriately according to the requirements of the protection device manual. After amplification, when it is confirmed that there is no other fault in the motor and related equipment, it can be started again; secondly, determine whether the overcurrent trip is caused by excessive motor load or mechanical fault. This usually occurs when the equipment suddenly stops during normal operation and trips when it is turned on again. In this case, a slow rotating motor (mainly used for vertical grinding maintenance and in-line overlay, located on the non-load side of the winding motor, connected to the motor through the opposite wheel and motor to determine if the motor failure was initiated by mechanical equipment being dragged by the winder. If the mechanical failure is eliminated, the winding motor can be driven using a slow rotating motor for about half an hour, and then restarting can be performed on the winding motor; Z after a failure of the motor itself or the motor starting device, resulting in overcurrent protection of the protective device. Under normal circumstances, if the winding machine itself or starting caused by the overcurrent protection device failure, usually accompanied by differential protection. At this point, you need to know in detail which part of the problem has occurred.

For the winding motor itself, the stator winding and the rotor winding winding motor can be insulated and tested with a shaker (a 2500V shaker should be used). If the insulation is low or varies greatly, the test needs to be performed by special experiments. Winding machines are usually started by liquid varistors.

Our company has experienced cases where the motor could not be started due to the electrostatic plate of the liquid varistor falling off. Therefore, the liquid varistor as a starting device is also an important item to check when the winding machine does not start properly.

WhatsApp/Wechat : +86 13075286997

Email : sales@vacuz.com [fusion_form form_post_id=”431″ margin_top=”” margin_right=”” margin_bottom=”” margin_left=”” hide_on_mobile=”small-visibility,medium-visibility,large-visibility” class=”” id=””][/fusion_form]