Phase-to-phase insulation fault is a unique fault feature of three-phase motors, and it is a problem of insulation breakdown between phases of the motor windings. From theoretical analysis, the probability of phase-to-phase insulation failures in multi-pole motors is higher, but from the actual fault analysis, it can be found that the problem of phase-to-phase insulation failures in 2-pole motors is more concentrated and prominent.
According to the analysis of the physical position distribution of the windings, the winding ends of the 2-pole motor are longer, otherwise the basic shaping requirements cannot be completed. For this reason, the winding coils are subject to more forces during the winding end forming process, especially for Random windings, as well as some operators with poor electrician foundation, have more serious winding damage, so the probability of turn-to-turn and ground faults at the ends of the windings is also increasing.
For phase-to-phase faults, theoretical analysis, as long as the phase-to-phase insulation pads are in place and the immersion treatment is good, but the actual situation is not optimistic. The main reason is not the insulation damage, but the displacement of the phase-to-phase insulation during the winding binding process. The resulting serious quality hidden dangers.
The binding of the winding ends is very important and is the basis of the winding curing process, but how to prevent the insulation displacement between phases is the key to the electrical engineering process. The shape design of the phase-to-phase insulation is based on the theoretical forming effect of the winding, but the actual operation process must be included in the scope of design control. Generally, the phase-to-phase insulation of a 2-pole motor is roughly semicircular, but it is precisely this shape that restricts the insulation and The fitting effect of the winding, in order to ensure a better fit between the two, we can consider the way of split lap, so that ZUI can largely solve the fit between the insulating material and the winding, and effectively control the insulation during the winding binding process. Shift problem.
Many motor manufacturers have encountered the problem of phase-to-phase insulation of 2-pole motor windings. Whether it is manual operation or mechanical operation, the key to fundamentally solving the problem lies in the shape and size of the windings and the shape and size of the phase-to-phase insulation.