TY - CONF T1 - Comparative analysis of unbalanced magnetic force in fractional-slot permanent magnet machines having external rotor topologies JO - IET Conference Publications PY - 2012/01/01 AU - Wu LJ AU - Zhu ZQ ED - DO - DOI: 10.1049/cp.2012.0272 IS - 592 CP Y2 - 2025/01/03 ER -