Abstract
Hybrid excitation flux switching machines (HEFSMs) have a several advantages such as robust rotor structure, high torque and power capabilities, and high efficiency suitable for light load and heavy industry applications. However, the general structure of HEFSMs employed with three main flux sources namely permanent magnet (PM), field excitation coil (FEC) and armature coil located on the stator body causes high manufacturing cost. Therefore, a new non-PM field excitation flux switching machine (FEFSM) consists of rugged rotor structure suitable for high-speed operation with capability to keep similar torque and power density of HEFSM is proposed and examined. In this paper, performances of both outer and inner rotor 12S-14P FEFSMs are analyzed and compared. As conclusion, the inner-rotor topology provides much higher torque and power when compared with outer rotor configuration.
Highlights
Electric motors with high torque and power density capabilities are essential for heavy load applications such as in aerospace and automotive traction system [1]
It is clear that initially the flux pattern is increased with the increase in DC field excitation coil (FEC) current density, JE
The flux generated from inner rotor is higher than outer rotor field excitation flux switching machine (FEFSM)
Summary
Electric motors with high torque and power density capabilities are essential for heavy load applications such as in aerospace and automotive traction system [1]. Flux-switching motors (FSMs) become an attractive research topic due to several advantages of robust rotor structure, easy temperature management of all active parts on the stator as well as the ability to keep higher torque/power density and efficiency. Both PMFSMs and FEFSMs have only single excitation flux source which come from PM and FE coil, respectively, while for HEFSMs the main magnetic flux sources are generated from both PM and FECs [3]. The main problem associated with this machine is high cost due to PM and windings To overcome these problems, new structures of 12S-14P outer-rotor and inner rotor fieldexcitation flux switching motor are proposed, in which the permanent magnet is replaced by field excitation coil.
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