Design and Characteristic Investigations of 12Slot-8Pole and 12Slot-10Pole Wound Field Three-Phase Switched-Flux Machines

Abstract

In this paper, a new wound field salient rotor (WFSalR) switched-flux machine (SFM) with 12 stator poles and 10 rotor poles is designed, investigated, and compared with the same stator but 8 rotor poles WFSalR SFM. The main advantage of these SFMs when compared with induction machines, direct current (DC) machines etc is that, all the active parts such that armature coil and field excitation coil (FEC) are located on the stator while the rotor part consists of only single piece iron. This makes the machine more robust, simple structure and more suitable to be used for high speed applications. Concentrated windings at the stator reduce the copper consumption and also the copper losses. Initially, the general construction of WFSalR SFMs and design specifications are outlined. Then, finite element analysis (FEA) is used to investigate and compare the flux linkage, induced emf, cogging torque, average torque and torque speed characteristics of proposed WFSalR SFMs.

A Novel Multi-Excitation-Tooth Nonoverlapping Stator Wound Field Synchronous Machine With Salient Rotor

“…However, since the polarity of the magnetic field generated by two adjacent excitation coils is opposite, as is shown in Fig. 2(b), the excitation magnetic flux self-loop is generated, which greatly reduces the torque output capacity of the machine [26]- [28]. To further improve the output torque, the 12-stator-tooth nonoverlapping stator wound field synchronous (N-SWFS) machine was proposed by changing the orientation of the excitation coils to be consistent [29], as is shown in Fig.…”