TY - JOUR
T1 - Comparative study of the electromagnetic performance of switched flux permanent magnet machines
AU - Zhu, Zi Qiang
AU - Al-Ani, Mahir
AU - Lee, Beomseok
AU - Liu, Xu
PY - 2015/4/1
Y1 - 2015/4/1
N2 - Switched flux permanent magnet (SFPM) machines have significant potential for many industrial applications because of their doubly salient structure, similar to switched reluctance machines. In recent years, several novel SFPM machine topologies, such as multi-tooth, E-core and C-core, have been developed to reduce the usage of permanent magnet materials without sacrificing the torque capability. A comparative study of the electromagnetic performance of these topologies, together with conventional SFPM machines having different stator/rotor pole combinations, that is, 12/10, 12/13 and 12/14, is presented. In addition to open circuit and electromagnetic torque performance, their torque- speed characteristics are investigated and compared. It is found that for conventional SFPM machines, the higher the rotor pole number, the better the flux-weakening capability, and higher maximum speed can be achieved. In contrast, owing to high d-axis inductance in the multi-tooth, E-core and C-core machines, infinite maximum speed can be obtained. Moreover, among all these machines, the multi-tooth machine has the highest flux-weakening factor, while the E-core machine exhibits the largest power capability. In addition to two-dimensional (2D) finite-element analysis (FEA), 3D-FEA is also performed accounting for the end effect. Finally, the torque-speed characteristics of prototype SFPM machines are measured to verify the FEA.
AB - Switched flux permanent magnet (SFPM) machines have significant potential for many industrial applications because of their doubly salient structure, similar to switched reluctance machines. In recent years, several novel SFPM machine topologies, such as multi-tooth, E-core and C-core, have been developed to reduce the usage of permanent magnet materials without sacrificing the torque capability. A comparative study of the electromagnetic performance of these topologies, together with conventional SFPM machines having different stator/rotor pole combinations, that is, 12/10, 12/13 and 12/14, is presented. In addition to open circuit and electromagnetic torque performance, their torque- speed characteristics are investigated and compared. It is found that for conventional SFPM machines, the higher the rotor pole number, the better the flux-weakening capability, and higher maximum speed can be achieved. In contrast, owing to high d-axis inductance in the multi-tooth, E-core and C-core machines, infinite maximum speed can be obtained. Moreover, among all these machines, the multi-tooth machine has the highest flux-weakening factor, while the E-core machine exhibits the largest power capability. In addition to two-dimensional (2D) finite-element analysis (FEA), 3D-FEA is also performed accounting for the end effect. Finally, the torque-speed characteristics of prototype SFPM machines are measured to verify the FEA.
KW - Stators
KW - Finite element analysis
KW - Magnetic cores
KW - Magnetic flux
KW - Permanent magnet machines
KW - Permanent magnets
KW - Reluctance machines
KW - Rotors
UR - http://www.scopus.com/inward/record.url?scp=84928342795&partnerID=8YFLogxK
U2 - 10.1049/iet-epa.2014.0261
DO - 10.1049/iet-epa.2014.0261
M3 - Article
AN - SCOPUS:84928342795
VL - 9
SP - 297
EP - 306
JO - IET Electric Power Applications
JF - IET Electric Power Applications
SN - 1751-8660
IS - 4
ER -