Analysis of Electromagnetic Characteristics of Dual-Rotor Induction Machines Based on Modularization

In order to solve the manufacturing, transportation, installation and repair problems of the giant fan, on the basis of the traditional one-piece dual-rotor induction machine, the two rotors of the fractional-slot centrally wound dual-rotor induction machine (15-slot 7-pair poles versus 24-slot 11-pair poles) are modularized separately, and the use of the T-type modular structure, which is equivalent to inserting a rotor gap in the yoke part of the rotor, thus changing the rotor magnetic circuit. According to the machine principle of this machine, the analytical method is used to derive the winding coefficients of the rotor for the T-type modular structure, and it is analytically obtained that the modular rotor structure reduces the amplitude of the winding coefficients of the non-operating subharmonics to a certain extent, and reduces the amplitude of the air-gap magnetism of the non-operating subharmonics. And through the finite element analysis on the traditional dual-rotor induction machine and modular dual-rotor induction machine no-load and load simulation, the results of comparative analysis, theoretical analysis and simulation results basically match. The modular rotor structure effectively improves the performance of the machine and increases the operating efficiency of the machine.