Kaifeng Hengda Motor Co., Ltd.
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Design of single and double winding coils for small asynchronous motors
Single-double-layer winding is a form of winding that has both single-layer and double-layer windings; it is essentially a deformation of the double-layer winding, except that the sides of the same-phase coils on the upper and lower layers of the double-layer winding become a single layer, and the upper and lower layers are different It still keeps the double-layer edge, and reconnects the ends into a single double-layer concentric coil winding according to the current direction of the slot. Reasonable use of single and double windings can effectively improve motor efficiency, reduce miscellaneous consumption, improve starting performance, reduce temperature rise, and save copper and energy. However, this type of winding has not been widely promoted throughout the country, and has been adopted by only a few motor factories. The main reason is that some motor designers and craftsmen think that the single-layer and double-layer windings have poor workmanship, which is time-consuming and difficult to ensure quality. In fact, as long as the coil design is reasonable, most of the 2- and 4-pole specifications of single-layer and double-layer winding motors are basically similar to the original single-layer and double-layer windings in terms of workmanship and workmanship. Only the single- and double-layer windings and other process operations need to have a familiar, accustomed and skilled process. To obtain good processability, coil design is a more important part. This article mainly describes the design method of single and double winding concentric coils.
The main design and process measures to improve the processability of single and double windings
(1) In order not to make the downline difficult, the slot full rate should not be too high. Generally, it is appropriate to take about 76%. GB motor .
(2) The number of coils is as small as possible (that is, as many single-layer coils as possible and double-layer coils as few as possible).
(3) The coil size should be designed properly, and the ends should not be too short; the concentric circles should be fitted together; the slot out of the core of the coil must have sufficient straight edge portions, so that the ends of the coils of different phases can be sufficiently separated from the core. The distance between the two ends makes it easier to insert the interphase block at the end, reducing the occurrence of interphase pressure breakdown, and the end flaring is not difficult. As long as you pay attention to the forming of the end of the line, the rear end of the finished line can be slightly shaped to complete the end. GB motor.
(4) Interphase withstand voltage breakdown is prone to occur at the intersections of coils with different phases at the ends of slots. The main reason is that the interphase insulation block pads are not good. In order to avoid such interphase breakdown, the method of lengthening the bottom notch cover strip (the double-layer slot interlayer strip is also appropriately lengthened) can be adopted. In this way, these cover strips are exactly pressed at the intersections of the coils of different phases, and the end-to-phase insulation blocks can rest on these cover strips, and the interphase insulation blocks are easy to be inserted, which can effectively reduce the end-to-phase breakdown phenomenon. . GB motor.
Single and double-layer windings are used in small motors, which will achieve obvious copper-saving effects, improve motor performance and reduce energy consumption. However, most motor manufacturers have not promoted the use of single and double windings. The reason is mainly due to insufficient understanding of the superiority of single and double windings. The design calculation of single and double windings is not mastered, and the designed coil size Inappropriate and unsuitable, resulting in difficulties in offline production, end flaring, shaping difficulties, phase-to-phase voltage breakdown at the intersections of the end coils, etc., making the promotion of single and double windings encountered resistance. However, as long as the coil size is properly designed, these problems can be solved. This article hopes that by introducing the design of single and double winding coils, everyone can master the design characteristics of single and double winding coils, and promote the use of single and double windings in small asynchronous motors, thereby improving the design and manufacturing level of domestic small motors and saving copper. Materials and reduce energy consumption.