Field-Excited Flux Switching Motor Design, Optimization and Analysis for Future Hybrid Electric Vehicle Using Finite Element Analysis

Abstract

Design, optimization, and performance analysis of a three-phase field-excited flux switching (FEFS) motor to be employed for the future hybrid electric vehicle (HEV) drive applications is investigated in this paper. The stator of designed motor made of electromagnetic steels is composed of unique field mmf source and armature coils while a rotor is made of iron stack. This design has been evaluated in order to achieve power and torque density higher than 3.50 kW/kg and 210 Nm, respectively, so as to compete with the interior permanent magnet synchronous (IPMS) motor commonly installed in HEV. Given its robust rotor structure, the maximum achievable motor speed went up to 20,000 rpm. To perfect the motor design, a deterministic optimization approach was applied to meet the stringent performance requirements. In addition, experimental analyses were carried out to confirm the effectiveness of the proposed motor. Positively, the proposed FEFS motor has proved to be a suitable candidate of non-permanent magnet motor for efficient and safe HEV drive.

Design and Experimental Evaluation of an In-Wheel Flux-Switching Machine for Light Vehicle Application

“…Other similar flux-modulation machines, such as the claw pole machine [45] or the synchronous homopolar machine [46], were not suitable due to limited space. In [47], a three-phase field-excited FSM design is demonstrated to be a good candidate for hybrid EV, with the optimized result achieving a power density of 4.8 kW/kg.…”

Design and performance analysis of various high torque segmented rotor HE‐FSM topologies for aircraft applications

“…In conclusion, HE‐FSM III shows better performances in terms of flux strengthening, induced emf, and torque as shown in Table 2. In addition, a good agreement between FEA and experimental performances have been published by many researchers [51–55]. Besides, in [56], the comparisons between FEA, analytical, and experimental of various electrical machines have been reviewed with a variation of 5–10% errors.…”

A New Outer-Rotor Hybrid-Excited Flux-Switching Machine Employing the HTS Homopolar Topology

“…The HTS field coil is a significant component of the FSM. Electric machines employing an HTS field coil are associated with a higher magnetic field density levels and a more compact volume compared to electric machines which have a copper coil [30][31][32][33]. The critical current, I C , of the HTS field coil at 77 K can be estimated based on data pertaining to the critical current degradation characteristics according to the external magnetic field of the HTS wire at 77 K [32].…”

“…The Bi-2223 wire with I C of 145 A at 77 K and self-field characteristics was considered for the HTS field coil. As shown in Figure 6, the I C of the HTS field coil was estimated to be 69 A using a load line [33]. The key parameters of the HTS field coil are summarized in Table 3.…”

“…In the positive hybrid excitation mode, the amplitudes of the flux linkage increase linearly with the MMF of the HTS field coils when it is below 6 kA•t. However, those at an MMF above 6 kA•t are highly saturated, indicating that an appropriate decision of the field current is required in order to minimize the electrical losses in the desired output [33]. Therefore, in this study, the operating characteristics of the machine are investigated by setting the maximum operating MMF to 6 kA•t.…”