This paper presents a quantitative comparison of two direct-drive outer-rotor permanent-magnet vernier (PMV) machines-namely the pole-splitting permanent-magnet vernier machine and vernier hybrid machine with emphasis on their performances and costs. The operating principles of two machines are discussed and their steady-state and transient performances are analyzed using the time-stepping finite element method. The overall weights and costs are also evaluated. The comparison results can be used to assess the validity of the designs of PMV machines.
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Li et al. (2011) studied this question.
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