The design of this type of winding is illustrated below with a specific example. The number of stator slots is Z=72, the number of poles of the power winding is 2pp=16 poles, and the number of poles of the control winding is 2pc=6 poles. The power winding is a 60-phase winding with a fundamental distribution coefficient of 0.9029. This winding satisfies the above three conditions. The design steps of the winding are as follows: draw the slot number phase diagram of the winding under the 2PP pole, and divide the coils according to the 60-phase band, as shown in the figure; draw the slot number phase diagram of the winding at 2pc pole, arrange the 2pp pole The three-phase trough number table is divided into three 90-phase windings separated by 120 and assigned to phases a, b, and c. At the same time, each phase slot number is divided into six segments, and 4Y/3Y can be designed as shown. Connection winding:
Advantages (1) The most reliable and reliable permanent magnet mechanism is simple and reliable. It has only one moving part, and it has no mechanical disengagement and locking device, which greatly improves the reliability of the whole system. 2) The operating energy consumption is the same as that of the electromagnetic operating mechanism. The permanent magnet mechanism is basically based on the electric energy, but its operating energy consumption is only for the electromagnetic mechanism. Foreign permanent magnet mechanisms have been widely used in on-column switches, which has fundamentally improved the reliability and automation of distribution networks. (3) The intermediate state without intermediate state means that the circuit breaker is not properly closed for various reasons, causing serious power system failure. The permanent magnet mechanism adopts a two-way principle in principle design, and its moving iron core or in the broken position Or, in the closed position, there is no intermediate state that is coincident.
Conclusion (1) The dynamic analysis of the permanent magnet operating mechanism is based on the coupled magnetic field model. The structure is different, and its dynamic characteristics, analysis and calculation methods, electromagnetic mechanism, spring mechanism, etc. are different. When engineering application, it is necessary to determine the specific design and calculation method based on the specific magnetic circuit structure on the basis of qualitative analysis. (2) The existence of nonlinear magnetic field and magnetic flux leakage can only be approximated. The final engineering design and calculation method is determined experimentally on the basis of theoretical design. (3) The theoretical analysis and calculation method is based on the experimental foundation and is suitable for the permanent magnet mechanism of the permanent magnet on the static iron core, which is practical for engineering applications.