DocumentCode :
230391
Title :
Novel external rotor switched flux memory motor with hybrid magnets
Author :
Wu, Dalei ; Zhu, Z.Q. ; Liu, Xindong
Author_Institution :
Dept. of Electron. & Electr. Eng., Univ. of Sheffield, Sheffield, UK
fYear :
2014
fDate :
22-25 Oct. 2014
Firstpage :
3324
Lastpage :
3300
Abstract :
This paper proposes a novel external rotor switched flux permanent magnet memory machine (SFPMM) with both normal NdFeB magnet and low coercive force magnet with focus on the influence of stator/rotor pole (Ns/Nr) combinations. The operation and torque enhancing principles for external rotor SFPMM are introduced firstly, while the possible Ns/Nr combinations are analysed with the help of winding factors and conditions for symmetrical back EMF. Then the design parameters which influence the torque capability are discussed. Further, three models with Ns=6 and Nr=kNs+1, k=1, 2, 3 respectively, are optimized under the same copper loss and magnet volume, which are consequently used for comparison of machine performances, such as open circuit field and back EMF, dq-axis inductances, cogging torque, torque capability, torque-speed characteristics and efficiency maps. The results show that the machine with larger Nr will have higher maximum torque but poorer flux weakening performance due to higher back EMF and smaller inductances, thus the machine having Nr=2Ns+1 is the optimal choice for external rotor SFPMM with hybrid magnets.
Keywords :
electric potential; magnetic leakage; permanent magnet motors; rotors; torque; back EMF; cogging torque; copper loss; dq-axis inductances; efficiency maps; external rotor SFPMM; external rotor switched flux memory motor; external rotor switched flux permanent magnet memory machine; hybrid magnets; magnet volume; open circuit field; torque capability; torque enhancing principles; torque-speed characteristics; Coils; Magnetic flux; Rotors; Saturation magnetization; Stator windings; Torque;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical Machines and Systems (ICEMS), 2014 17th International Conference on
Conference_Location :
Hangzhou
Type :
conf
DOI :
10.1109/ICEMS.2014.7014066
Filename :
7014066
Link To Document :
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