The article substantiates the relevance of the development of pole-changing windings for turbo-engins. There is a review of specialized literature on the development of pole-changing windings. Two-speed motors with a 4/3 pole number ratio have one pole-changing stator winding by the method of PAM. Based on the method of “Discretely specified spatial function” a pole-changing winding is obtained for a 3/4 pole ratio with 72 stator slots. The analysis of the electromagnetic properties of the obtained winding is carried out. The correspondence of the obtained winding for use in turbo-mechanisms is revealed. As a result of the study, there were procured the stator windings at 6 and 8 poles, which enabled to change the spin speed of the motor in the fan drives without breaking the drive power circuit by the scheme ΥΥΥ/ΥΥΥ with additional branches
The Numerous lift installation require two speeds of rotation for the work. One of them is necessary for lifting, and another for exact stop of a cabin at a level of a floor. Now in these installations two speed motors with two separate windings are used. In this paper the opportunity of creation of the highly effective two-speed motor with pole-changing winding for lifts and elevator installations is considered. The industrial test results of motors with such windings are shown. The advantages of motors with pole-changing windings over conventional motors with two separate windings are given.
The article presents a methodology for developing pole-switched windings with a pole pair ratio of 5/6 with 108 stator slots, the results of the analysis and ways to improve the electromagnetic properties, and also the areas of application of the obtained windings are determined.
In many industries, lifting and transport machines are used, particularly cranes, conveyors, and hoists. Taking into account their wide prevalence and large installed capacity, as well as the complexity of the operating mode, special attention is paid to the creation of new energy- and resource-saving electric drives that facilitate the start-up process and ensure accurate stopping of highly inertial lifting and transport mechanisms. In this direction, one of the priority tasks is the development of two-speed pole-changing motors that meet the requirements of the electric drive of lifting and transport mechanisms. Based on the method of "Discretely-given spatial functions", a pole-changing winding was obtained for a ratio of 1/5 poles at 30 slots of the stator. Analysis of the electromagnetic properties of the developed pole-changing winding showed that, compared with a close analog, the differential scattering coefficient on the p=1 side of the pole decreases from 1.7% to 1.3%, and on the p=5 side of the pole decreases from 15.9% to 9.7%, and also in the picture of the magnetomotive force, the presence of higher harmonic ones on the side of the first velocity decreases up to 6%, and from the second speed up to 20%.
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