A new structure of 12sS-8P hybrid excitation flux switching motor using segmental rotor

The efficient use of energy enables commercial and industrial facilities to minimise production costs, increase profits, and stay competitive. The majority of electrical energy consumed in most industrial facilities is used to run electric motors. Therefore, there is a need for researchers to develop advanced electric motors with less cost and high efficiency. There has been a recent interest in flux switching motor (FSM) in which all flux sources are positioned in stator that make the rotor simple, robust, and brushless. The development of research has been with toothed rotor structures, which exploit changes of paths for the stator teeth, but this structure produces less torque and power. Hence, the use of a segmental rotor structure has been developed, which gives significant gains. The primary function of the segments is to provide a defined magnetic path for conveying the flux to adjacent armature coil in stator as the rotor rotates. This design gives shorter end-winding than with a toothed rotor structure, which requires fully-pitched coils. Hence, permanent magnet FSM (PMFSM) and field excitation FSM (FEFSM) with segmental rotor have been developed, but due to their infirmity of less torque generation inherit from less flux linkage, a new structure of hybrid excitation FSM (HEFSM) is proposed. The proposed design HEFSM I is analysed using a commercial 2D FEA package, JMAG-designer software. Initially, HEFSM I has been improved and optimised by using deterministic optimisation techniques and achieved torque and power of almost 48% and 56% more than the initial HEFSM I, and almost 3% and 8% more than target values respectively. Additionally, an alternate structure of HEFSM II has been proposed, investigated, and optimised. Finally, optimised HEFSM II has achieved torque and power almost 14% and 13% more than target values respectively. The novel structure HEFSM II with segmental rotor has produced higher performances than existing PMFSM and FEFSM, proving their suitability towards efficient and reliable motors