Saving electrical energy by using induction motors with pole changing windings in the water supply system

Abstract

This article provides information on the level of provision of clean drinking water to the population of Republic of Uzbekistan and the work carried out in the field, as well as the deficiencies that arise in the water supply enterprise and measures to eliminate them. The operation modes of the enterprise’s pump units, the analysis of the main parameters and the possibility of saving electricity and water consumption due to the application of two-speed asynchronous motors with pole change winding for such equipment are presented.

Induction machine with pole-changing winding for turbomechanisms

“…It is clear from this DSSF that the angles of shift in these windings do not differ from ideal 𝑚-zone windings, i.e. in all slots Δ𝜑 = 0 [15].…”

“…with improved electromagnetic properties is possible, using the modernized method of discretely specified spatial function (DSSF). This method has been developed by the Electrical Energy Supply department at the Tashkent State Technical University [6,7,14,15].…”

“…The procedure for constructing a pole-changing winding according to the DSSF method consists of the following stages [6,7,11,14,15]:…”

“…Accordingly, from the 2𝑝 2 pole side, there can be coils in slots with the following numbers: for phase a: 1, 2, 41, 42, 57, 58; for phase b: 9, 10, 25, 26, 65, 66 and for phase c: 17, 18, 33, 34, 49, 50. These coils are deduced in additional branches and, being redistributed on phases, contribute to build up a magnetic field of 2𝑝 2 poles [15].…”

“…The deviation from these values will be defined as a difference between the angles of the shift of conventional and new pole-changing windings: |Δ𝜑| = |𝜑 usual − 𝜑 new |. Concerning the difference Δ𝜑 between angles, it is better to take it in absolute values, since the deviation from the usual shift to the left or right should be estimated equally [15].…”