A Design Method for Stator Pole-changing Winding of Three-phase AC Motor

Abstract

The invention discloses a design method of a stator pole-changing winding of a three-phase AC motor stator. The design method includes the steps: giving the number p1 of pole pairs before pole changing and the number p2 of pole pairs after pole changing, selecting a groove number coefficient k, and then making two phase diagrams of the pole number groove number after the stator groove number Z is determined; evenly dividing the p1 groove number phase diagram into 120-degree phase bands according to columns, removing the groove number of each phase on the edge of the phase so that the rest groove numbers is a multiple of five, and then distributing the groove numbers for each phase on the basis of three branches with the ratio of 1: 2: 2, wherein for the p1 phase, the ratio 1 groove number is positioned in the middle of the 120-degree phase bands, and the ratio 2 groove number is divided into two groups positioned on two sides of the ratio 1 groove number; and separately adjusting the turn ratios of coils respectively represented by the two groups of the ratio 2 groove number so that synthesis magnetomotive force phases and amplitudes generated by the respective three branches are identical, wherein for the p2 phase, the three branches of each 120-degree phase band still have to meet the requirement that synthesis magnetomotive force phases and amplitudes generated by the respective branches are identical. The obtained pole-changing scheme will not produce branch circulation in the condition of two pole numbers. After the required pole-changing scheme is obtained, the groove number and the pole number can be further expanded by a superposition method, and thus more selectable pole-changing schemes can be obtained.

Description

technical field [0001] The invention belongs to the technical field of motors, and more specifically relates to a design method of a pole-changing winding of a stator of a three-phase AC motor. Background technique [0002] Changing the number of pole pairs of the stator winding for speed regulation is one of the commonly used speed regulation methods for three-phase induction motors. This pole-changing speed regulation method only needs to change the connection sequence and wiring method of the three-phase winding coils of the motor stator to change the number of pole pairs of the motor winding, so that the motor has more than two speeds, which is comparable to other speed regulation methods such as frequency conversion. Ratio, high efficiency and easy speed regulation by changing poles. [0003] There are two commonly used pole changing methods: reverse method and phase commutation method. Among them, the reverse pole-changing method is to recombine the coils of each pha...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the defects of the prior art, the purpose of the present invention is to provide a design method for the stator pole-changing winding of a three-phase AC motor, which aims to solve the technical problem that the existing phase-changing pole-changing 3Y / 3Y parallel connection method cannot be used for the pole-to-pole ratio

Images